11fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell/* 21fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Copyright (C) 2015 The Android Open Source Project 31fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 41fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Licensed under the Apache License, Version 2.0 (the "License"); 51fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * you may not use this file except in compliance with the License. 61fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * You may obtain a copy of the License at 71fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 81fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * http://www.apache.org/licenses/LICENSE-2.0 91fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Unless required by applicable law or agreed to in writing, software 111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * distributed under the License is distributed on an "AS IS" BASIS, 121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * See the License for the specific language governing permissions and 141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * limitations under the License. 151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18ac5fe7c617c66850fff75a9fce9979c6e5674b0fAurimas Liutikaspackage androidx.core.widget; 191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 20ac5fe7c617c66850fff75a9fce9979c6e5674b0fAurimas Liutikasimport static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP; 218e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas 221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.content.Context; 231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.content.res.TypedArray; 241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.graphics.Canvas; 251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.graphics.Rect; 26bcb5323316d898cc22873efc2a145a5912e8a75cshepshapardimport android.os.Build; 271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Bundle; 281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Parcel; 291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Parcelable; 301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.util.AttributeSet; 311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.util.Log; 321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.util.TypedValue; 331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.FocusFinder; 341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.KeyEvent; 351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.MotionEvent; 361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.VelocityTracker; 371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.View; 381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.ViewConfiguration; 391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.ViewGroup; 401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.ViewParent; 411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.accessibility.AccessibilityEvent; 421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.animation.AnimationUtils; 43506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikasimport android.widget.EdgeEffect; 441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.widget.FrameLayout; 453035be16658d7652fdc472f971c81d8f7ffb60fdAurimas Liutikasimport android.widget.OverScroller; 461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.widget.ScrollView; 471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 489dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.annotation.NonNull; 499dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.annotation.Nullable; 509dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.annotation.RestrictTo; 519dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.AccessibilityDelegateCompat; 529dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.InputDeviceCompat; 539dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.NestedScrollingChild2; 549dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.NestedScrollingChildHelper; 55bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapardimport androidx.core.view.NestedScrollingParent2; 569dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.NestedScrollingParentHelper; 579dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.ScrollingView; 589dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.ViewCompat; 599dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.accessibility.AccessibilityNodeInfoCompat; 609dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikasimport androidx.core.view.accessibility.AccessibilityRecordCompat; 619dede51868bbbe16aadcd65e04860bea8ea50e05Aurimas Liutikas 621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport java.util.List; 631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell/** 651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * NestedScrollView is just like {@link android.widget.ScrollView}, but it supports acting 661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * as both a nested scrolling parent and child on both new and old versions of Android. 671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Nested scrolling is enabled by default. 681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 69bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapardpublic class NestedScrollView extends FrameLayout implements NestedScrollingParent2, 7076daed103193a1756535d1f59b165e98e1d17445Chris Banes NestedScrollingChild2, ScrollingView { 711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static final int ANIMATED_SCROLL_GAP = 250; 721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static final float MAX_SCROLL_FACTOR = 0.5f; 741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final String TAG = "NestedScrollView"; 761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 77cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 78cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Interface definition for a callback to be invoked when the scroll 79cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * X or Y positions of a view change. 80cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 81cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * <p>This version of the interface works on all versions of Android, back to API v4.</p> 82cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 83cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see #setOnScrollChangeListener(OnScrollChangeListener) 84cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 85cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes public interface OnScrollChangeListener { 86cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 87cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Called when the scroll position of a view changes. 88cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 89cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param v The view whose scroll position has changed. 90cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param scrollX Current horizontal scroll origin. 91cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param scrollY Current vertical scroll origin. 92cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param oldScrollX Previous horizontal scroll origin. 93cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param oldScrollY Previous vertical scroll origin. 94cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 95cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes void onScrollChange(NestedScrollView v, int scrollX, int scrollY, 96cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes int oldScrollX, int oldScrollY); 97cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 98cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private long mLastScroll; 1001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final Rect mTempRect = new Rect(); 1023035be16658d7652fdc472f971c81d8f7ffb60fdAurimas Liutikas private OverScroller mScroller; 103506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas private EdgeEffect mEdgeGlowTop; 104506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas private EdgeEffect mEdgeGlowBottom; 1051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Position of the last motion event. 1081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mLastMotionY; 1101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * True when the layout has changed but the traversal has not come through yet. 1131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Ideally the view hierarchy would keep track of this for us. 1141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsLayoutDirty = true; 1161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsLaidOut = false; 1171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * The child to give focus to in the event that a child has requested focus while the 1201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * layout is dirty. This prevents the scroll from being wrong if the child has not been 1211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * laid out before requesting focus. 1221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private View mChildToScrollTo = null; 1241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * True if the user is currently dragging this ScrollView around. This is 1271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * not the same as 'is being flinged', which can be checked by 1281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * mScroller.isFinished() (flinging begins when the user lifts his finger). 1291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsBeingDragged = false; 1311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Determines speed during touch scrolling 1341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private VelocityTracker mVelocityTracker; 1361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * When set to true, the scroll view measure its child to make it fill the currently 1391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * visible area. 1401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mFillViewport; 1421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Whether arrow scrolling is animated. 1451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mSmoothScrollingEnabled = true; 1471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mTouchSlop; 1491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mMinimumVelocity; 1501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mMaximumVelocity; 1511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * ID of the active pointer. This is used to retain consistency during 1541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * drags/flings if multiple pointers are used. 1551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mActivePointerId = INVALID_POINTER; 1571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Used during scrolling to retrieve the new offset within the window. 1601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final int[] mScrollOffset = new int[2]; 1621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final int[] mScrollConsumed = new int[2]; 1631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mNestedYOffset; 1641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16576daed103193a1756535d1f59b165e98e1d17445Chris Banes private int mLastScrollerY; 16676daed103193a1756535d1f59b165e98e1d17445Chris Banes 1671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Sentinel value for no current active pointer. 1691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Used by {@link #mActivePointerId}. 1701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final int INVALID_POINTER = -1; 1721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private SavedState mSavedState; 1741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final AccessibilityDelegate ACCESSIBILITY_DELEGATE = new AccessibilityDelegate(); 1761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final int[] SCROLLVIEW_STYLEABLE = new int[] { 1781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell android.R.attr.fillViewport 1791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell }; 1801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final NestedScrollingParentHelper mParentHelper; 1821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final NestedScrollingChildHelper mChildHelper; 1831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private float mVerticalScrollFactor; 1851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 186cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes private OnScrollChangeListener mOnScrollChangeListener; 187cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 188852749684a10e7d104eed8fb2dcc68b64d079340Jake Wharton public NestedScrollView(@NonNull Context context) { 1891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell this(context, null); 1901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 1911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 192852749684a10e7d104eed8fb2dcc68b64d079340Jake Wharton public NestedScrollView(@NonNull Context context, @Nullable AttributeSet attrs) { 1931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell this(context, attrs, 0); 1941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 1951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 196852749684a10e7d104eed8fb2dcc68b64d079340Jake Wharton public NestedScrollView(@NonNull Context context, @Nullable AttributeSet attrs, 197852749684a10e7d104eed8fb2dcc68b64d079340Jake Wharton int defStyleAttr) { 1981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(context, attrs, defStyleAttr); 1991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initScrollView(); 2001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final TypedArray a = context.obtainStyledAttributes( 2021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell attrs, SCROLLVIEW_STYLEABLE, defStyleAttr, 0); 2031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setFillViewport(a.getBoolean(0, false)); 2051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell a.recycle(); 2071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mParentHelper = new NestedScrollingParentHelper(this); 2091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper = new NestedScrollingChildHelper(this); 2101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // ...because why else would you be using this widget? 2121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setNestedScrollingEnabled(true); 2131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.setAccessibilityDelegate(this, ACCESSIBILITY_DELEGATE); 2151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 217bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard // NestedScrollingChild2 218bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard 219bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard @Override 220bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean startNestedScroll(int axes, int type) { 221bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return mChildHelper.startNestedScroll(axes, type); 222bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard } 223bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard 224bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard @Override 225bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public void stopNestedScroll(int type) { 226bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard mChildHelper.stopNestedScroll(type); 227bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard } 228bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard 229bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard @Override 230bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean hasNestedScrollingParent(int type) { 231bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return mChildHelper.hasNestedScrollingParent(type); 232bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard } 233bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard 234bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard @Override 235bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, 236bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard int dyUnconsumed, int[] offsetInWindow, int type) { 237bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, 238bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard offsetInWindow, type); 239bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard } 240bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard 241bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard @Override 242bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow, 243bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard int type) { 244bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow, type); 245bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard } 246bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard 2471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // NestedScrollingChild 2481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setNestedScrollingEnabled(boolean enabled) { 2511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper.setNestedScrollingEnabled(enabled); 2521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isNestedScrollingEnabled() { 2561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.isNestedScrollingEnabled(); 2571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean startNestedScroll(int axes) { 261bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return startNestedScroll(axes, ViewCompat.TYPE_TOUCH); 2621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 265bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public void stopNestedScroll() { 266bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard stopNestedScroll(ViewCompat.TYPE_TOUCH); 26776daed103193a1756535d1f59b165e98e1d17445Chris Banes } 26876daed103193a1756535d1f59b165e98e1d17445Chris Banes 26976daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 270bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean hasNestedScrollingParent() { 271bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return hasNestedScrollingParent(ViewCompat.TYPE_TOUCH); 2721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 275bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, 276bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard int dyUnconsumed, int[] offsetInWindow) { 277bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, 278bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard offsetInWindow, ViewCompat.TYPE_TOUCH); 27976daed103193a1756535d1f59b165e98e1d17445Chris Banes } 28076daed103193a1756535d1f59b165e98e1d17445Chris Banes 28176daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 282bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) { 283bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow, ViewCompat.TYPE_TOUCH); 2841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 287bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) { 288bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed); 28976daed103193a1756535d1f59b165e98e1d17445Chris Banes } 29076daed103193a1756535d1f59b165e98e1d17445Chris Banes 29176daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 292bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean dispatchNestedPreFling(float velocityX, float velocityY) { 293bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return mChildHelper.dispatchNestedPreFling(velocityX, velocityY); 2941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 296bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard // NestedScrollingParent2 297bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard 2981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 299bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public boolean onStartNestedScroll(@NonNull View child, @NonNull View target, int axes, 300bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard int type) { 301bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return (axes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0; 30276daed103193a1756535d1f59b165e98e1d17445Chris Banes } 30376daed103193a1756535d1f59b165e98e1d17445Chris Banes 30476daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 305bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public void onNestedScrollAccepted(@NonNull View child, @NonNull View target, int axes, 306bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard int type) { 307bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard mParentHelper.onNestedScrollAccepted(child, target, axes, type); 308bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL, type); 3091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 312bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public void onStopNestedScroll(@NonNull View target, int type) { 313bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard mParentHelper.onStopNestedScroll(target, type); 314bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard stopNestedScroll(type); 31576daed103193a1756535d1f59b165e98e1d17445Chris Banes } 31676daed103193a1756535d1f59b165e98e1d17445Chris Banes 31776daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 318bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, 319bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard int dyUnconsumed, int type) { 320bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard final int oldScrollY = getScrollY(); 321bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard scrollBy(0, dyUnconsumed); 322bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard final int myConsumed = getScrollY() - oldScrollY; 323bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard final int myUnconsumed = dyUnconsumed - myConsumed; 324bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard dispatchNestedScroll(0, myConsumed, 0, myUnconsumed, null, 325bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard type); 3261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 329bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard public void onNestedPreScroll(@NonNull View target, int dx, int dy, @NonNull int[] consumed, 330bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard int type) { 331bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard dispatchNestedPreScroll(dx, dy, consumed, null, type); 3321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // NestedScrollingParent 3351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 338bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard return onStartNestedScroll(child, target, nestedScrollAxes, ViewCompat.TYPE_TOUCH); 3391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedScrollAccepted(View child, View target, int nestedScrollAxes) { 343bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard onNestedScrollAccepted(child, target, nestedScrollAxes, ViewCompat.TYPE_TOUCH); 3441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onStopNestedScroll(View target) { 348bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard onStopNestedScroll(target, ViewCompat.TYPE_TOUCH); 3491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, 3531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int dyUnconsumed) { 354bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard onNestedScroll(target, dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, 355bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard ViewCompat.TYPE_TOUCH); 3561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 360bd9c35d6db58b5c9b075d751a2c64203eccc6cd7shepshapard onNestedPreScroll(target, dx, dy, consumed, ViewCompat.TYPE_TOUCH); 3611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 3651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!consumed) { 3661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell flingWithNestedDispatch((int) velocityY); 3671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 3681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 3701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 374d370f75e50bf31d348d4e424ba8477ac77635f70Chris Banes return dispatchNestedPreFling(velocityX, velocityY); 3751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int getNestedScrollAxes() { 3791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mParentHelper.getNestedScrollAxes(); 3801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // ScrollView import 3831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 384e2104f4b5c8e3ad63570306a25e61502dfe4c418Aurimas Liutikas @Override 3851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean shouldDelayChildPressedState() { 3861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 3871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected float getTopFadingEdgeStrength() { 3911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 3921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0.0f; 3931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int length = getVerticalFadingEdgeLength(); 3961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 3971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollY < length) { 3981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollY / (float) length; 3991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 1.0f; 4021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected float getBottomFadingEdgeStrength() { 4061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 4071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0.0f; 4081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 41093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 41193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 4121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int length = getVerticalFadingEdgeLength(); 4131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottomEdge = getHeight() - getPaddingBottom(); 41493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final int span = child.getBottom() + lp.bottomMargin - getScrollY() - bottomEdge; 4151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (span < length) { 4161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return span / (float) length; 4171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 1.0f; 4201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 4231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return The maximum amount this scroll view will scroll in response to 4241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * an arrow event. 4251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int getMaxScrollAmount() { 4271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (int) (MAX_SCROLL_FACTOR * getHeight()); 4281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initScrollView() { 4313035be16658d7652fdc472f971c81d8f7ffb60fdAurimas Liutikas mScroller = new OverScroller(getContext()); 4321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setFocusable(true); 4331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 4341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setWillNotDraw(false); 4351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewConfiguration configuration = ViewConfiguration.get(getContext()); 4361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTouchSlop = configuration.getScaledTouchSlop(); 4371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 4381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 4391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child) { 4431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child); 4481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, int index) { 4521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, index); 4571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, ViewGroup.LayoutParams params) { 4611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, params); 4661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, int index, ViewGroup.LayoutParams params) { 4701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, index, params); 4751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 478cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Register a callback to be invoked when the scroll X or Y positions of 479cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * this view change. 480cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * <p>This version of the method works on all versions of Android, back to API v4.</p> 481cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 482cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param l The listener to notify when the scroll X or Y position changes. 483cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see android.view.View#getScrollX() 484cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see android.view.View#getScrollY() 485cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 486852749684a10e7d104eed8fb2dcc68b64d079340Jake Wharton public void setOnScrollChangeListener(@Nullable OnScrollChangeListener l) { 487cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes mOnScrollChangeListener = l; 488cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 489cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 490cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 4911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Returns true this ScrollView can be scrolled 4921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean canScroll() { 49493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard if (getChildCount() > 0) { 49593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 49693ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 49793ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int childSize = child.getHeight() + lp.topMargin + lp.bottomMargin; 49893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int parentSpace = getHeight() - getPaddingTop() - getPaddingBottom(); 49993ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard return childSize > parentSpace; 5001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 5021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 5051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Indicates whether this ScrollView's content is stretched to fill the viewport. 5061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 5071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return True if the content fills the viewport, false otherwise. 5081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 509929f27aab7ac7231f3734c988d5ee7201627d535Alan Viverette * @attr name android:fillViewport 5101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 5111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isFillViewport() { 5121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mFillViewport; 5131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 516236bf5bc5041e4bf356eac3855fd4fcf72cd6994Aurimas Liutikas * Set whether this ScrollView should stretch its content height to fill the viewport or not. 5171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 5181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param fillViewport True to stretch the content's height to the viewport's 5191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * boundaries, false otherwise. 5201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 521929f27aab7ac7231f3734c988d5ee7201627d535Alan Viverette * @attr name android:fillViewport 5221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 5231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setFillViewport(boolean fillViewport) { 5241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (fillViewport != mFillViewport) { 5251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mFillViewport = fillViewport; 5261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestLayout(); 5271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 5311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Whether arrow scrolling will animate its transition. 5321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 5331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isSmoothScrollingEnabled() { 5341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mSmoothScrollingEnabled; 5351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 5381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Set whether arrow scrolling will animate its transition. 5391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 5401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 5411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 5421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSmoothScrollingEnabled = smoothScrollingEnabled; 5431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 546cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes protected void onScrollChanged(int l, int t, int oldl, int oldt) { 547cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes super.onScrollChanged(l, t, oldl, oldt); 548cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 549cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes if (mOnScrollChangeListener != null) { 550cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes mOnScrollChangeListener.onScrollChange(this, l, t, oldl, oldt); 551cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 552cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 553cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 554cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes @Override 5551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 5561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onMeasure(widthMeasureSpec, heightMeasureSpec); 5571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mFillViewport) { 5591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 5601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 5631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (heightMode == MeasureSpec.UNSPECIFIED) { 5641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 5651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 56893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 56993ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 57093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard 57193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int childSize = child.getMeasuredHeight(); 57293ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int parentSpace = getMeasuredHeight() 57393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard - getPaddingTop() 57493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard - getPaddingBottom() 57593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard - lp.topMargin 57693ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard - lp.bottomMargin; 5771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 57893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard if (childSize < parentSpace) { 5791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 58093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin, 58193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard lp.width); 5821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeightMeasureSpec = 58393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard MeasureSpec.makeMeasureSpec(parentSpace, MeasureSpec.EXACTLY); 5841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 5901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchKeyEvent(KeyEvent event) { 5911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Let the focused view and/or our descendants get the key first 5921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return super.dispatchKeyEvent(event) || executeKeyEvent(event); 5931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 5961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * You can call this function yourself to have the scroll view perform 5971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * scrolling from a key event, just as if the event had been dispatched to 5981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * it by the view hierarchy. 5991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 6001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param event The key event to execute. 6011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Return true if the event was handled, else false. 6021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 603852749684a10e7d104eed8fb2dcc68b64d079340Jake Wharton public boolean executeKeyEvent(@NonNull KeyEvent event) { 6041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.setEmpty(); 6051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!canScroll()) { 6071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 6081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 6091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused == this) currentFocused = null; 6101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View nextFocused = FocusFinder.getInstance().findNextFocus(this, 6111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell currentFocused, View.FOCUS_DOWN); 6121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return nextFocused != null 6131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && nextFocused != this 6141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && nextFocused.requestFocus(View.FOCUS_DOWN); 6151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 6171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean handled = false; 6201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (event.getAction() == KeyEvent.ACTION_DOWN) { 6211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (event.getKeyCode()) { 6221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_DPAD_UP: 6231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!event.isAltPressed()) { 6241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = arrowScroll(View.FOCUS_UP); 6251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 6261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = fullScroll(View.FOCUS_UP); 6271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_DPAD_DOWN: 6301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!event.isAltPressed()) { 6311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = arrowScroll(View.FOCUS_DOWN); 6321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 6331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = fullScroll(View.FOCUS_DOWN); 6341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_SPACE: 6371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 6381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return handled; 6431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean inChild(int x, int y) { 6461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 6471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 6481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final View child = getChildAt(0); 6491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return !(y < child.getTop() - scrollY 6501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || y >= child.getBottom() - scrollY 6511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || x < child.getLeft() 6521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || x >= child.getRight()); 6531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 6551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initOrResetVelocityTracker() { 6581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker == null) { 6591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = VelocityTracker.obtain(); 6601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 6611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 6621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initVelocityTrackerIfNotExists() { 6661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker == null) { 6671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = VelocityTracker.obtain(); 6681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void recycleVelocityTracker() { 6721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 6731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.recycle(); 6741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = null; 6751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 6791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 6801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (disallowIntercept) { 6811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 6821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestDisallowInterceptTouchEvent(disallowIntercept); 6841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 6871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onInterceptTouchEvent(MotionEvent ev) { 6881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * This method JUST determines whether we want to intercept the motion. 6901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If we return true, onMotionEvent will be called and we do the actual 6911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * scrolling there. 6921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Shortcut the most recurring case: the user is in the dragging 6961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * state and he is moving his finger. We want to intercept this 6971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * motion. 6981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int action = ev.getAction(); 7001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 7011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 7021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7046ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas switch (action & MotionEvent.ACTION_MASK) { 7051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_MOVE: { 7061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 7081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * whether the user has moved far enough from his original down touch. 7091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Locally do absolute value. mLastMotionY is set to the y value 7131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * of the down event. 7141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int activePointerId = mActivePointerId; 7161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (activePointerId == INVALID_POINTER) { 7171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // If we don't have a valid id, the touch down wasn't on content. 7181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7211b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int pointerIndex = ev.findPointerIndex(activePointerId); 7221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pointerIndex == -1) { 7231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Log.e(TAG, "Invalid pointerId=" + activePointerId 7241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + " in onInterceptTouchEvent"); 7251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7281b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int y = (int) ev.getY(pointerIndex); 7291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int yDiff = Math.abs(y - mLastMotionY); 7301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (yDiff > mTouchSlop 7311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0) { 7321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = true; 7331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y; 7341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initVelocityTrackerIfNotExists(); 7351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(ev); 7361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset = 0; 7371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 7381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 7391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 7401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_DOWN: { 7461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int y = (int) ev.getY(); 74776daed103193a1756535d1f59b165e98e1d17445Chris Banes if (!inChild((int) ev.getX(), y)) { 7481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 7491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 7501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Remember location of down touch. 7551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * ACTION_DOWN always refers to pointer index 0. 7561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y; 7581b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(0); 7591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initOrResetVelocityTracker(); 7611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(ev); 7621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 763661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * If being flinged and user touches the screen, initiate drag; 764661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * otherwise don't. mScroller.isFinished should be false when 765661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * being flinged. We need to call computeScrollOffset() first so that 766661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * isFinished() is correct. 7671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 768661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes mScroller.computeScrollOffset(); 7691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = !mScroller.isFinished(); 77076daed103193a1756535d1f59b165e98e1d17445Chris Banes startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL, ViewCompat.TYPE_TOUCH); 7711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_CANCEL: 7751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_UP: 7761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Release the drag */ 7771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 7781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mActivePointerId = INVALID_POINTER; 7791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 78000db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, getScrollRange())) { 78100db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes ViewCompat.postInvalidateOnAnimation(this); 78200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 78376daed103193a1756535d1f59b165e98e1d17445Chris Banes stopNestedScroll(ViewCompat.TYPE_TOUCH); 7841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7856ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_POINTER_UP: 7861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onSecondaryPointerUp(ev); 7871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * The only time we want to intercept motion events is if we are in the 7921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * drag mode. 7931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mIsBeingDragged; 7951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 7981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onTouchEvent(MotionEvent ev) { 7991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initVelocityTrackerIfNotExists(); 8001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell MotionEvent vtev = MotionEvent.obtain(ev); 8021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8036ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final int actionMasked = ev.getActionMasked(); 8041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (actionMasked == MotionEvent.ACTION_DOWN) { 8061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset = 0; 8071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mNestedYOffset); 8091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (actionMasked) { 8111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_DOWN: { 8121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 8131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 8141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 8161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 8171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 8181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 8191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 8231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If being flinged and user touches, stop the fling. isFinished 8241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * will be false if being flinged. 8251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 8261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mScroller.isFinished()) { 8271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.abortAnimation(); 8281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Remember where the motion event started 8311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = (int) ev.getY(); 8321b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(0); 83376daed103193a1756535d1f59b165e98e1d17445Chris Banes startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL, ViewCompat.TYPE_TOUCH); 8341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_MOVE: 8371b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 8381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (activePointerIndex == -1) { 8391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 8401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8431b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int y = (int) ev.getY(activePointerIndex); 8441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int deltaY = mLastMotionY - y; 84576daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset, 84676daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.TYPE_TOUCH)) { 8471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY -= mScrollConsumed[1]; 8481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 8491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset += mScrollOffset[1]; 8501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { 8521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 8531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 8541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 8551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = true; 8571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (deltaY > 0) { 8581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY -= mTouchSlop; 8591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 8601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY += mTouchSlop; 8611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mIsBeingDragged) { 8641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Scroll to follow the motion event 8651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y - mScrollOffset[1]; 8661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int oldY = getScrollY(); 8681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 869e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final int overscrollMode = getOverScrollMode(); 870e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas boolean canOverscroll = overscrollMode == View.OVER_SCROLL_ALWAYS 871e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overscrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 8721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Calling overScrollByCompat will call onOverScrolled, which 8741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // calls onScrollChanged if applicable. 8751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (overScrollByCompat(0, deltaY, 0, getScrollY(), 0, range, 0, 87676daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, true) && !hasNestedScrollingParent(ViewCompat.TYPE_TOUCH)) { 8771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Break our velocity if we hit a scroll barrier. 8781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 8791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrolledDeltaY = getScrollY() - oldY; 8821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int unconsumedY = deltaY - scrolledDeltaY; 88376daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, mScrollOffset, 88476daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.TYPE_TOUCH)) { 8851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY -= mScrollOffset[1]; 8861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 8871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset += mScrollOffset[1]; 8881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (canOverscroll) { 8891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ensureGlows(); 8901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int pulledToY = oldY + deltaY; 8911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pulledToY < 0) { 892506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas EdgeEffectCompat.onPull(mEdgeGlowTop, (float) deltaY / getHeight(), 8931b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov ev.getX(activePointerIndex) / getWidth()); 8941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowBottom.isFinished()) { 8951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onRelease(); 8961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (pulledToY > range) { 898506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas EdgeEffectCompat.onPull(mEdgeGlowBottom, (float) deltaY / getHeight(), 8991b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov 1.f - ev.getX(activePointerIndex) 9001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell / getWidth()); 9011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowTop.isFinished()) { 9021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onRelease(); 9031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null 9061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 9071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 9081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 9121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_UP: 91376daed103193a1756535d1f59b165e98e1d17445Chris Banes final VelocityTracker velocityTracker = mVelocityTracker; 91476daed103193a1756535d1f59b165e98e1d17445Chris Banes velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 91576daed103193a1756535d1f59b165e98e1d17445Chris Banes int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 91676daed103193a1756535d1f59b165e98e1d17445Chris Banes if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 91776daed103193a1756535d1f59b165e98e1d17445Chris Banes flingWithNestedDispatch(-initialVelocity); 91876daed103193a1756535d1f59b165e98e1d17445Chris Banes } else if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, 91976daed103193a1756535d1f59b165e98e1d17445Chris Banes getScrollRange())) { 92076daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.postInvalidateOnAnimation(this); 9211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 922ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes mActivePointerId = INVALID_POINTER; 923ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes endDrag(); 9241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 9251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_CANCEL: 9261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mIsBeingDragged && getChildCount() > 0) { 92700db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, 92800db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes getScrollRange())) { 92900db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes ViewCompat.postInvalidateOnAnimation(this); 93000db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 9311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 932ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes mActivePointerId = INVALID_POINTER; 933ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes endDrag(); 9341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 9356ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_POINTER_DOWN: { 9366ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final int index = ev.getActionIndex(); 9371b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(index); 9381b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(index); 9391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 9401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9416ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_POINTER_UP: 9421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onSecondaryPointerUp(ev); 9431b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); 9441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 9451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 9481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(vtev); 9491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.recycle(); 9511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 9521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void onSecondaryPointerUp(MotionEvent ev) { 9556ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final int pointerIndex = ev.getActionIndex(); 9561b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int pointerId = ev.getPointerId(pointerIndex); 9571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pointerId == mActivePointerId) { 9581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // This was our active pointer going up. Choose a new 9591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // active pointer and adjust accordingly. 9601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // TODO: Make this decision more intelligent. 9611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 9621b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(newPointerIndex); 9631b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(newPointerIndex); 9641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 9651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 9661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 970e2104f4b5c8e3ad63570306a25e61502dfe4c418Aurimas Liutikas @Override 9711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onGenericMotionEvent(MotionEvent event) { 9721b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov if ((event.getSource() & InputDeviceCompat.SOURCE_CLASS_POINTER) != 0) { 9731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (event.getAction()) { 9746ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_SCROLL: { 9751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsBeingDragged) { 9766ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 9771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (vscroll != 0) { 9781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int delta = (int) (vscroll * getVerticalScrollFactorCompat()); 9791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 9801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int oldScrollY = getScrollY(); 9811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollY = oldScrollY - delta; 9821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY < 0) { 9831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = 0; 9841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollY > range) { 9851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = range; 9861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY != oldScrollY) { 9881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(getScrollX(), newScrollY); 9891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 9901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 9971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private float getVerticalScrollFactorCompat() { 10001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVerticalScrollFactor == 0) { 10011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell TypedValue outValue = new TypedValue(); 10021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final Context context = getContext(); 10031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!context.getTheme().resolveAttribute( 10041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell android.R.attr.listPreferredItemHeight, outValue, true)) { 10051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException( 10061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell "Expected theme to define listPreferredItemHeight."); 10071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVerticalScrollFactor = outValue.getDimension( 10091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell context.getResources().getDisplayMetrics()); 10101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mVerticalScrollFactor; 10121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 101415375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 10151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 10161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedX, boolean clampedY) { 10171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(scrollX, scrollY); 10181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean overScrollByCompat(int deltaX, int deltaY, 10211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollX, int scrollY, 10221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRangeX, int scrollRangeY, 10231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int maxOverScrollX, int maxOverScrollY, 10241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean isTouchEvent) { 1025e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final int overScrollMode = getOverScrollMode(); 10261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean canScrollHorizontal = 10271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 10281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean canScrollVertical = 10291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell computeVerticalScrollRange() > computeVerticalScrollExtent(); 1030e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final boolean overScrollHorizontal = overScrollMode == View.OVER_SCROLL_ALWAYS 1031e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 1032e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final boolean overScrollVertical = overScrollMode == View.OVER_SCROLL_ALWAYS 1033e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 10341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollX = scrollX + deltaX; 10361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!overScrollHorizontal) { 10371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell maxOverScrollX = 0; 10381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollY = scrollY + deltaY; 10411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!overScrollVertical) { 10421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell maxOverScrollY = 0; 10431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Clamp values if at the limits and record 10461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int left = -maxOverScrollX; 10471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int right = maxOverScrollX + scrollRangeX; 10481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int top = -maxOverScrollY; 10491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottom = maxOverScrollY + scrollRangeY; 10501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedX = false; 10521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollX > right) { 10531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollX = right; 10541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedX = true; 10551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollX < left) { 10561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollX = left; 10571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedX = true; 10581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedY = false; 10611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY > bottom) { 10621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = bottom; 10631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedY = true; 10641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollY < top) { 10651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = top; 10661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedY = true; 10671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 106976daed103193a1756535d1f59b165e98e1d17445Chris Banes if (clampedY && !hasNestedScrollingParent(ViewCompat.TYPE_NON_TOUCH)) { 107000db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes mScroller.springBack(newScrollX, newScrollY, 0, 0, 0, getScrollRange()); 107100db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 107200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes 10731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 10741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return clampedX || clampedY; 10761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1078540222c3675801eaa141ace1c164c4d3499b4721Aurimas Liutikas int getScrollRange() { 10791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRange = 0; 10801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 10811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 108293ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 108393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int childSize = child.getHeight() + lp.topMargin + lp.bottomMargin; 108493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int parentSpace = getHeight() - getPaddingTop() - getPaddingBottom(); 108593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard scrollRange = Math.max(0, childSize - parentSpace); 10861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollRange; 10881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 10911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p> 10921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Finds the next focusable component that fits in the specified bounds. 10931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * </p> 10941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 10951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param topFocus look for a candidate is the one at the top of the bounds 10961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * if topFocus is true, or at the bottom of the bounds if topFocus is 10971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * false 10981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param top the top offset of the bounds in which a focusable must be 10991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * found 11001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param bottom the bottom offset of the bounds in which a focusable must 11011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * be found 11021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return the next focusable component in the bounds or null if none can 11031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * be found 11041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 11061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell List<View> focusables = getFocusables(View.FOCUS_FORWARD); 11081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View focusCandidate = null; 11091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 11111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * A fully contained focusable is one where its top is below the bound's 11121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * top, and its bottom is above the bound's bottom. A partially 11131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * contained focusable is one where some part of it is within the 11141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * bounds, but it also has some part that is not within bounds. A fully contained 11151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focusable is preferred to a partially contained focusable. 11161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean foundFullyContainedFocusable = false; 11181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = focusables.size(); 11201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell for (int i = 0; i < count; i++) { 11211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = focusables.get(i); 11221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int viewTop = view.getTop(); 11231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int viewBottom = view.getBottom(); 11241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (top < viewBottom && viewTop < bottom) { 11261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 11271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * the focusable is in the target area, it is a candidate for 11281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focusing 11291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11314d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final boolean viewIsFullyContained = (top < viewTop) && (viewBottom < bottom); 11321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (focusCandidate == null) { 11341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* No candidate, take this one */ 11351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 11361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell foundFullyContainedFocusable = viewIsFullyContained; 11371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 11381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean viewIsCloserToBoundary = 11394d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas (topFocus && viewTop < focusCandidate.getTop()) 11404d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas || (!topFocus && viewBottom > focusCandidate.getBottom()); 11411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (foundFullyContainedFocusable) { 11431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (viewIsFullyContained && viewIsCloserToBoundary) { 11441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 11451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * We're dealing with only fully contained views, so 11461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * it has to be closer to the boundary to beat our 11471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * candidate 11481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 11501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 11521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (viewIsFullyContained) { 11531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Any fully contained view beats a partially contained view */ 11541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 11551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell foundFullyContainedFocusable = true; 11561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (viewIsCloserToBoundary) { 11571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 11581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Partially contained view beats another partially 11591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * contained view if it's closer 11601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 11621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return focusCandidate; 11691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 11721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Handles scrolling in response to a "page up/down" shortcut press. This 11731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * method will scroll the view by one page up or down and give the focus 11741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to the topmost/bottommost component in the new visible area. If no 11751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * component is a good candidate for focus, this scrollview reclaims the 11761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focus.</p> 11771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 11781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 11791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go one page up or 11801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@link android.view.View#FOCUS_DOWN} to go one page down 11811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 11821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean pageScroll(int direction) { 11841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean down = direction == View.FOCUS_DOWN; 11851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 11861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (down) { 11881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = getScrollY() + height; 11891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = getChildCount(); 11901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count > 0) { 11911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = getChildAt(count - 1); 119293ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard NestedScrollView.LayoutParams lp = (LayoutParams) view.getLayoutParams(); 119393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int bottom = view.getBottom() + lp.bottomMargin + getPaddingBottom(); 119493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard if (mTempRect.top + height > bottom) { 119593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard mTempRect.top = bottom - height; 11961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 11991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = getScrollY() - height; 12001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mTempRect.top < 0) { 12011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = 0; 12021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = mTempRect.top + height; 12051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 12071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Handles scrolling in response to a "home/end" shortcut press. This 12111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * method will scroll the view to the top or bottom and give the focus 12121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to the topmost/bottommost component in the new visible area. If no 12131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * component is a good candidate for focus, this scrollview reclaims the 12141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focus.</p> 12151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 12161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 12171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go the top of the view or 12181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@link android.view.View#FOCUS_DOWN} to go the bottom 12191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 12201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean fullScroll(int direction) { 12221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean down = direction == View.FOCUS_DOWN; 12231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 12241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = 0; 12261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = height; 12271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (down) { 12291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = getChildCount(); 12301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count > 0) { 12311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = getChildAt(count - 1); 123293ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard NestedScrollView.LayoutParams lp = (LayoutParams) view.getLayoutParams(); 123393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard mTempRect.bottom = view.getBottom() + lp.bottomMargin + getPaddingBottom(); 12341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = mTempRect.bottom - height; 12351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 12391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Scrolls the view to make the area defined by <code>top</code> and 12431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <code>bottom</code> visible. This method attempts to give the focus 12441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to a component visible in this area. If no component can be focused in 12451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * the new visible area, the focus is reclaimed by this ScrollView.</p> 12461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 12471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 12481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 12491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param top the top offset of the new area to be made visible 12501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param bottom the bottom offset of the new area to be made visible 12511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 12521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean scrollAndFocus(int direction, int top, int bottom) { 12541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean handled = true; 12551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 12571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int containerTop = getScrollY(); 12581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int containerBottom = containerTop + height; 12591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean up = direction == View.FOCUS_UP; 12601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View newFocused = findFocusableViewInBounds(up, top, bottom); 12621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newFocused == null) { 12631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newFocused = this; 12641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (top >= containerTop && bottom <= containerBottom) { 12671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = false; 12681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 12691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int delta = up ? (top - containerTop) : (bottom - containerBottom); 12701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(delta); 12711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newFocused != findFocus()) newFocused.requestFocus(direction); 12741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return handled; 12761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Handle scrolling in response to an up or down arrow click. 12801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 12811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction The direction corresponding to the arrow key that was 12821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * pressed 12831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return True if we consumed the event, false otherwise 12841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean arrowScroll(int direction) { 12861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 12871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused == this) currentFocused = null; 12881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 12901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int maxJump = getMaxScrollAmount(); 12921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 12941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nextFocused.getDrawingRect(mTempRect); 12951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(nextFocused, mTempRect); 12961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(scrollDelta); 12981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nextFocused.requestFocus(direction); 12991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 13001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // no new focus 13011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = maxJump; 13021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 13041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollDelta = getScrollY(); 13051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (direction == View.FOCUS_DOWN) { 13061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 130793ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 130893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 130993ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int daBottom = child.getBottom() + lp.bottomMargin; 13101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenBottom = getScrollY() + getHeight() - getPaddingBottom(); 131193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard scrollDelta = Math.min(daBottom - screenBottom, maxJump); 13121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollDelta == 0) { 13151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 13161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 13181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused != null && currentFocused.isFocused() 13211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && isOffScreen(currentFocused)) { 13221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // previously focused item still has focus and is off screen, give 13231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // it up (take it back to ourselves) 13241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 13251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // sure to 13261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // get it) 13271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int descendantFocusability = getDescendantFocusability(); // save 13281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 13291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestFocus(); 13301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(descendantFocusability); // restore 13311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 13331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return whether the descendant of this scroll view is scrolled off 13371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * screen. 13381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean isOffScreen(View descendant) { 13401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 13411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return whether the descendant of this scroll view is within delta 13451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * pixels of being on the screen. 13461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 13481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell descendant.getDrawingRect(mTempRect); 13491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(descendant, mTempRect); 13501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (mTempRect.bottom + delta) >= getScrollY() 13521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (mTempRect.top - delta) <= (getScrollY() + height); 13531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Smooth scroll by a Y delta 13571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 13581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param delta the number of pixels to scroll by on the Y axis 13591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void doScrollY(int delta) { 13611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (delta != 0) { 13621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mSmoothScrollingEnabled) { 13631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(0, delta); 13641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 13651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, delta); 13661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 13721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 13731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param dx the number of pixels to scroll by on the X axis 13741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param dy the number of pixels to scroll by on the Y axis 13751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public final void smoothScrollBy(int dx, int dy) { 13771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 13781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Nothing to do. 13791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 13801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 13821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (duration > ANIMATED_SCROLL_GAP) { 138393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 138493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 138593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int childSize = child.getHeight() + lp.topMargin + lp.bottomMargin; 138693ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int parentSpace = getHeight() - getPaddingTop() - getPaddingBottom(); 13871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 138893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final int maxY = Math.max(0, childSize - parentSpace); 13891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 139093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard mLastScrollerY = getScrollY(); 13911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.startScroll(getScrollX(), scrollY, 0, dy); 13921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 13931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 13941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mScroller.isFinished()) { 13951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.abortAnimation(); 13961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(dx, dy); 13981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 14001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 14031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 14041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 14051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param x the position where to scroll on the X axis 14061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param y the position where to scroll on the Y axis 14071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 14081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public final void smoothScrollTo(int x, int y) { 14091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(x - getScrollX(), y - getScrollY()); 14101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 14131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>The scroll range of a scroll view is the overall height of all of its 14141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * children.</p> 1415c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki * @hide 14161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 14178e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 14181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 1419c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollRange() { 14201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int count = getChildCount(); 142193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final int parentSpace = getHeight() - getPaddingBottom() - getPaddingTop(); 14221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count == 0) { 142393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard return parentSpace; 14241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 142693ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 142793ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 142893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int scrollRange = child.getBottom() + lp.bottomMargin; 14291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 143093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final int overscrollBottom = Math.max(0, scrollRange - parentSpace); 14311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollY < 0) { 14321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange -= scrollY; 14331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (scrollY > overscrollBottom) { 14341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange += scrollY - overscrollBottom; 14351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollRange; 14381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1440c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 14418e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 14421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 1443c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollOffset() { 14441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return Math.max(0, super.computeVerticalScrollOffset()); 14451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1447c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 14488e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1449c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1450c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollExtent() { 1451c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeVerticalScrollExtent(); 1452c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1453c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1454c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 14558e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1456c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1457c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollRange() { 1458c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollRange(); 1459c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1460c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1461c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 14628e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1463c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1464c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollOffset() { 1465c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollOffset(); 1466c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1467c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1468c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 14698e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1470c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1471c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollExtent() { 1472c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollExtent(); 1473c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1474c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 14751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 14764d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas protected void measureChild(View child, int parentWidthMeasureSpec, 14774d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas int parentHeightMeasureSpec) { 14781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewGroup.LayoutParams lp = child.getLayoutParams(); 14791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childWidthMeasureSpec; 14811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeightMeasureSpec; 14821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, getPaddingLeft() 14841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + getPaddingRight(), lp.width); 14851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 14871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 14891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 14921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 14931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int parentHeightMeasureSpec, int heightUsed) { 14941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 14951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 14971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin 14981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + widthUsed, lp.width); 14991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 15001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 15011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 15031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 15061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void computeScroll() { 15071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mScroller.computeScrollOffset()) { 150876daed103193a1756535d1f59b165e98e1d17445Chris Banes final int x = mScroller.getCurrX(); 150976daed103193a1756535d1f59b165e98e1d17445Chris Banes final int y = mScroller.getCurrY(); 151076daed103193a1756535d1f59b165e98e1d17445Chris Banes 151176daed103193a1756535d1f59b165e98e1d17445Chris Banes int dy = y - mLastScrollerY; 15121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 151376daed103193a1756535d1f59b165e98e1d17445Chris Banes // Dispatch up to parent 151476daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dispatchNestedPreScroll(0, dy, mScrollConsumed, null, ViewCompat.TYPE_NON_TOUCH)) { 151576daed103193a1756535d1f59b165e98e1d17445Chris Banes dy -= mScrollConsumed[1]; 151676daed103193a1756535d1f59b165e98e1d17445Chris Banes } 151776daed103193a1756535d1f59b165e98e1d17445Chris Banes 151876daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dy != 0) { 15191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 152076daed103193a1756535d1f59b165e98e1d17445Chris Banes final int oldScrollY = getScrollY(); 152176daed103193a1756535d1f59b165e98e1d17445Chris Banes 152276daed103193a1756535d1f59b165e98e1d17445Chris Banes overScrollByCompat(0, dy, getScrollX(), oldScrollY, 0, range, 0, 0, false); 152376daed103193a1756535d1f59b165e98e1d17445Chris Banes 152476daed103193a1756535d1f59b165e98e1d17445Chris Banes final int scrolledDeltaY = getScrollY() - oldScrollY; 152576daed103193a1756535d1f59b165e98e1d17445Chris Banes final int unconsumedY = dy - scrolledDeltaY; 152676daed103193a1756535d1f59b165e98e1d17445Chris Banes 152776daed103193a1756535d1f59b165e98e1d17445Chris Banes if (!dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, null, 152876daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.TYPE_NON_TOUCH)) { 152976daed103193a1756535d1f59b165e98e1d17445Chris Banes final int mode = getOverScrollMode(); 153076daed103193a1756535d1f59b165e98e1d17445Chris Banes final boolean canOverscroll = mode == OVER_SCROLL_ALWAYS 153176daed103193a1756535d1f59b165e98e1d17445Chris Banes || (mode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 153276daed103193a1756535d1f59b165e98e1d17445Chris Banes if (canOverscroll) { 153376daed103193a1756535d1f59b165e98e1d17445Chris Banes ensureGlows(); 153476daed103193a1756535d1f59b165e98e1d17445Chris Banes if (y <= 0 && oldScrollY > 0) { 153576daed103193a1756535d1f59b165e98e1d17445Chris Banes mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 153676daed103193a1756535d1f59b165e98e1d17445Chris Banes } else if (y >= range && oldScrollY < range) { 153776daed103193a1756535d1f59b165e98e1d17445Chris Banes mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 153876daed103193a1756535d1f59b165e98e1d17445Chris Banes } 15391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 154276daed103193a1756535d1f59b165e98e1d17445Chris Banes 154376daed103193a1756535d1f59b165e98e1d17445Chris Banes // Finally update the scroll positions and post an invalidation 154476daed103193a1756535d1f59b165e98e1d17445Chris Banes mLastScrollerY = y; 154576daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.postInvalidateOnAnimation(this); 154676daed103193a1756535d1f59b165e98e1d17445Chris Banes } else { 154776daed103193a1756535d1f59b165e98e1d17445Chris Banes // We can't scroll any more, so stop any indirect scrolling 154876daed103193a1756535d1f59b165e98e1d17445Chris Banes if (hasNestedScrollingParent(ViewCompat.TYPE_NON_TOUCH)) { 154976daed103193a1756535d1f59b165e98e1d17445Chris Banes stopNestedScroll(ViewCompat.TYPE_NON_TOUCH); 155076daed103193a1756535d1f59b165e98e1d17445Chris Banes } 155176daed103193a1756535d1f59b165e98e1d17445Chris Banes // and reset the scroller y 155276daed103193a1756535d1f59b165e98e1d17445Chris Banes mLastScrollerY = 0; 15531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 15571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Scrolls the view to the given child. 15581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 15591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param child the View to scroll to 15601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 15611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void scrollToChild(View child) { 15621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getDrawingRect(mTempRect); 15631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Offset from child's local coordinates to ScrollView coordinates */ 15651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(child, mTempRect); 15661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 15681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollDelta != 0) { 15701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, scrollDelta); 15711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 15751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If rect is off screen, scroll just enough to get it (or at least the 15761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * first screen size chunk of it) on screen. 15771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 15781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param rect The rectangle. 15791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param immediate True to scroll immediately without animation 15801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if scrolling was performed 15811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 15821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean scrollToChildRect(Rect rect, boolean immediate) { 15831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 15841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean scroll = delta != 0; 15851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scroll) { 15861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (immediate) { 15871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, delta); 15881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 15891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(0, delta); 15901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scroll; 15931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 15961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Compute the amount to scroll in the Y direction in order to get 15971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * a rectangle completely on the screen (or, if taller than the screen, 15981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * at least the first screen size chunk of it). 15991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 16001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param rect The rect. 16011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return The scroll delta. 16021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 16031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 16041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) return 0; 16051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 16071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenTop = getScrollY(); 16081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenBottom = screenTop + height; 160993ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int actualScreenBottom = screenBottom; 16101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int fadingEdge = getVerticalFadingEdgeLength(); 16121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 161393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard // TODO: screenTop should be incremented by fadingEdge * getTopFadingEdgeStrength (but for 161493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard // the target scroll distance). 16151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // leave room for top fading edge as long as rect isn't at very top 16161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.top > 0) { 16171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell screenTop += fadingEdge; 16181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 162093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard // TODO: screenBottom should be decremented by fadingEdge * getBottomFadingEdgeStrength (but 162193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard // for the target scroll distance). 16221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // leave room for bottom fading edge as long as rect isn't at very bottom 162393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 162493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 162593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard if (rect.bottom < child.getHeight() + lp.topMargin + lp.bottomMargin) { 16261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell screenBottom -= fadingEdge; 16271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollYDelta = 0; 16301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.bottom > screenBottom && rect.top > screenTop) { 16321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // need to move down to get it in view: move down just enough so 16331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // that the entire rectangle is in view (or at least the first 16341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen size chunk). 16351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.height() > height) { 16371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // just enough to get screen size chunk on 16381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta += (rect.top - screenTop); 16391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 16401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // get entire rect at bottom of screen 16411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta += (rect.bottom - screenBottom); 16421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // make sure we aren't scrolling beyond the end of our content 164593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int bottom = child.getBottom() + lp.bottomMargin; 164693ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int distanceToBottom = bottom - actualScreenBottom; 16471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 16481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (rect.top < screenTop && rect.bottom < screenBottom) { 16501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // need to move up to get it in view: move up just enough so that 16511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // entire rectangle is in view (or at least the first screen 16521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // size chunk of it). 16531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.height() > height) { 16551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen size chunk 16561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta -= (screenBottom - rect.bottom); 16571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 16581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // entire rect at top 16591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta -= (screenTop - rect.top); 16601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // make sure we aren't scrolling any further than the top our content 16631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 16641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollYDelta; 16661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestChildFocus(View child, View focused) { 16701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsLayoutDirty) { 16711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollToChild(focused); 16721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 16731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // The child may not be laid out yet, we can't compute the scroll yet 16741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildToScrollTo = focused; 16751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestChildFocus(child, focused); 16771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 16811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * When looking for focus in children of a scroll view, need to be a little 16821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * more careful not to give focus to something that is scrolled off screen. 16831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 16841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * This is more expensive than the default {@link android.view.ViewGroup} 16851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * implementation, otherwise this behavior might have been made the default. 16861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 16871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected boolean onRequestFocusInDescendants(int direction, 16891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Rect previouslyFocusedRect) { 16901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // convert from forward / backward notation to up / down / left / right 16921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // (ugh). 16931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (direction == View.FOCUS_FORWARD) { 16941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell direction = View.FOCUS_DOWN; 16951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (direction == View.FOCUS_BACKWARD) { 16961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell direction = View.FOCUS_UP; 16971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16994d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final View nextFocus = previouslyFocusedRect == null 17004d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas ? FocusFinder.getInstance().findNextFocus(this, null, direction) 17014d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas : FocusFinder.getInstance().findNextFocusFromRect( 17024d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas this, previouslyFocusedRect, direction); 17031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nextFocus == null) { 17051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 17061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isOffScreen(nextFocus)) { 17091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 17101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return nextFocus.requestFocus(direction, previouslyFocusedRect); 17131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 17171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean immediate) { 17181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // offset into coordinate space of this scroll view 17191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell rectangle.offset(child.getLeft() - child.getScrollX(), 17201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getTop() - child.getScrollY()); 17211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollToChildRect(rectangle, immediate); 17231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestLayout() { 17271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLayoutDirty = true; 17281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestLayout(); 17291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onLayout(boolean changed, int l, int t, int r, int b) { 17331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onLayout(changed, l, t, r, b); 17341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLayoutDirty = false; 17351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Give a child focus if it needs it 17361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 17371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollToChild(mChildToScrollTo); 17381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildToScrollTo = null; 17401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsLaidOut) { 174293ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard // If there is a saved state, scroll to the position saved in that state. 17431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mSavedState != null) { 17441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), mSavedState.scrollPosition); 17451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSavedState = null; 17461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } // mScrollY default value is "0" 17471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 174893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard // Make sure current scrollY position falls into the scroll range. If it doesn't, 174993ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard // scroll such that it does. 175093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int childSize = 0; 175193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard if (getChildCount() > 0) { 175293ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard View child = getChildAt(0); 175393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 175493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard childSize = child.getMeasuredHeight() + lp.topMargin + lp.bottomMargin; 175593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard } 175693ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int parentSpace = b - t - getPaddingTop() - getPaddingBottom(); 175793ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int currentScrollY = getScrollY(); 175893ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int newScrollY = clamp(currentScrollY, parentSpace, childSize); 175993ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard if (newScrollY != currentScrollY) { 176093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard scrollTo(getScrollX(), newScrollY); 17611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Calling this with the present values causes it to re-claim them 17651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), getScrollY()); 17661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLaidOut = true; 17671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onAttachedToWindow() { 1771d344e81ad956ec445038f5ba2ca2ebd1831b1f8aAlan Viverette super.onAttachedToWindow(); 1772d344e81ad956ec445038f5ba2ca2ebd1831b1f8aAlan Viverette 17731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLaidOut = false; 17741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onSizeChanged(int w, int h, int oldw, int oldh) { 17781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onSizeChanged(w, h, oldw, oldh); 17791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 17814d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas if (null == currentFocused || this == currentFocused) { 17821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 17834d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas } 17841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // If the currently-focused view was visible on the screen when the 17861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen was at the old height, then scroll the screen to make that 17871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // view visible with the new screen height. 17881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 17891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell currentFocused.getDrawingRect(mTempRect); 17901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(currentFocused, mTempRect); 17911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 17921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(scrollDelta); 17931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 17971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Return true if child is a descendant of parent, (or equal to the parent). 17981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 17991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static boolean isViewDescendantOf(View child, View parent) { 18001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (child == parent) { 18011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 18021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent theParent = child.getParent(); 18051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 18061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 18091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Fling the scroll view 18101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 18111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param velocityY The initial velocity in the Y direction. Positive 18121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * numbers mean that the finger/cursor is moving down the screen, 18131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * which means we want to scroll towards the top. 18141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 18151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void fling(int velocityY) { 18161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 181776daed103193a1756535d1f59b165e98e1d17445Chris Banes startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL, ViewCompat.TYPE_NON_TOUCH); 181876daed103193a1756535d1f59b165e98e1d17445Chris Banes mScroller.fling(getScrollX(), getScrollY(), // start 181976daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, velocityY, // velocities 182076daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, 0, // x 182176daed103193a1756535d1f59b165e98e1d17445Chris Banes Integer.MIN_VALUE, Integer.MAX_VALUE, // y 182276daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, 0); // overscroll 182376daed103193a1756535d1f59b165e98e1d17445Chris Banes mLastScrollerY = getScrollY(); 18241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 18251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void flingWithNestedDispatch(int velocityY) { 18291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 18304d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final boolean canFling = (scrollY > 0 || velocityY > 0) 18314d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas && (scrollY < getScrollRange() || velocityY < 0); 18321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!dispatchNestedPreFling(0, velocityY)) { 18331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dispatchNestedFling(0, velocityY, canFling); 183476daed103193a1756535d1f59b165e98e1d17445Chris Banes fling(velocityY); 18351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void endDrag() { 18391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 18401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 184276daed103193a1756535d1f59b165e98e1d17445Chris Banes stopNestedScroll(ViewCompat.TYPE_TOUCH); 18431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null) { 18451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onRelease(); 18461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onRelease(); 18471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 18511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@inheritDoc} 18521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 18531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>This version also clamps the scrolling to the bounds of our child. 18541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 18551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void scrollTo(int x, int y) { 18571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // we rely on the fact the View.scrollBy calls scrollTo. 18581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 18591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 186093ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard final NestedScrollView.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 186193ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int parentSpaceHorizontal = getWidth() - getPaddingLeft() - getPaddingRight(); 186293ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int childSizeHorizontal = child.getWidth() + lp.leftMargin + lp.rightMargin; 186393ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int parentSpaceVertical = getHeight() - getPaddingTop() - getPaddingBottom(); 186493ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard int childSizeVertical = child.getHeight() + lp.topMargin + lp.bottomMargin; 186593ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard x = clamp(x, parentSpaceHorizontal, childSizeHorizontal); 186693ade4a86ccf8e87af43401a3b3e41a804e311a1shepshapard y = clamp(y, parentSpaceVertical, childSizeVertical); 18671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (x != getScrollX() || y != getScrollY()) { 18681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(x, y); 18691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void ensureGlows() { 1874e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas if (getOverScrollMode() != View.OVER_SCROLL_NEVER) { 18751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop == null) { 18761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Context context = getContext(); 1877506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas mEdgeGlowTop = new EdgeEffect(context); 1878506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas mEdgeGlowBottom = new EdgeEffect(context); 18791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 18811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop = null; 18821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom = null; 18831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void draw(Canvas canvas) { 18881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.draw(canvas); 18891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null) { 18901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 18911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowTop.isFinished()) { 18921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int restoreCount = canvas.save(); 1893bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int width = getWidth(); 1894bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int height = getHeight(); 1895bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int xTranslation = 0; 1896bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int yTranslation = Math.min(0, scrollY); 1897bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP || getClipToPadding()) { 1898bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard width -= getPaddingLeft() + getPaddingRight(); 1899bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard xTranslation += getPaddingLeft(); 1900bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard } 1901bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && getClipToPadding()) { 1902bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard height -= getPaddingTop() + getPaddingBottom(); 1903bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard yTranslation += getPaddingTop(); 1904bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard } 1905bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard canvas.translate(xTranslation, yTranslation); 1906bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard mEdgeGlowTop.setSize(width, height); 19071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop.draw(canvas)) { 19081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 19091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.restoreToCount(restoreCount); 19111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowBottom.isFinished()) { 19131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int restoreCount = canvas.save(); 1914bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int width = getWidth(); 1915bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int height = getHeight(); 1916bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int xTranslation = 0; 1917bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard int yTranslation = Math.max(getScrollRange(), scrollY) + height; 1918bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP || getClipToPadding()) { 1919bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard width -= getPaddingLeft() + getPaddingRight(); 1920bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard xTranslation += getPaddingLeft(); 1921bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard } 1922bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && getClipToPadding()) { 1923bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard height -= getPaddingTop() + getPaddingBottom(); 1924bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard yTranslation -= getPaddingBottom(); 1925bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard } 1926bcb5323316d898cc22873efc2a145a5912e8a75cshepshapard canvas.translate(xTranslation - width, yTranslation); 19271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.rotate(180, width, 0); 19281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.setSize(width, height); 19291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 19301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 19311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.restoreToCount(restoreCount); 19331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static int clamp(int n, int my, int child) { 19381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (my >= child || n < 0) { 19391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* my >= child is this case: 19401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 19411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 19421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * or 19431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 19441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 19451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * or 19461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 19471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 19481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 19491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * n < 0 is this case: 19501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ me ------| 19511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-------- child --------| 19521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-- mScrollX --| 19531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 19541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0; 19551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19564d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas if ((my + n) > child) { 19571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* this case: 19581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ me ------| 19591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 19601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-- mScrollX --| 19611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 19624d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas return child - my; 19631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return n; 19651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onRestoreInstanceState(Parcelable state) { 1969bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas if (!(state instanceof SavedState)) { 1970bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas super.onRestoreInstanceState(state); 1971bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas return; 1972bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas } 1973bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas 19741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState ss = (SavedState) state; 19751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onRestoreInstanceState(ss.getSuperState()); 19761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSavedState = ss; 19771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestLayout(); 19781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected Parcelable onSaveInstanceState() { 19821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Parcelable superState = super.onSaveInstanceState(); 19831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState ss = new SavedState(superState); 19841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ss.scrollPosition = getScrollY(); 19851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return ss; 19861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static class SavedState extends BaseSavedState { 19891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int scrollPosition; 19901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState(Parcelable superState) { 19921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(superState); 19931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19954d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas SavedState(Parcel source) { 19961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(source); 19971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollPosition = source.readInt(); 19981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 20001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 20011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void writeToParcel(Parcel dest, int flags) { 20021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.writeToParcel(dest, flags); 20031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dest.writeInt(scrollPosition); 20041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 20061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 20071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public String toString() { 20081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return "HorizontalScrollView.SavedState{" 20091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + Integer.toHexString(System.identityHashCode(this)) 20101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + " scrollPosition=" + scrollPosition + "}"; 20111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 20134d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas public static final Parcelable.Creator<SavedState> CREATOR = 20144d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas new Parcelable.Creator<SavedState>() { 201515375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 20161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public SavedState createFromParcel(Parcel in) { 20171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return new SavedState(in); 20181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 202015375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 20211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public SavedState[] newArray(int size) { 20221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return new SavedState[size]; 20231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell }; 20251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 20271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static class AccessibilityDelegate extends AccessibilityDelegateCompat { 20281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 20291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean performAccessibilityAction(View host, int action, Bundle arguments) { 20301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (super.performAccessibilityAction(host, action, arguments)) { 20311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 20321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 20341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!nsvHost.isEnabled()) { 20351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 20361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (action) { 20381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: { 20391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() 20401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell - nsvHost.getPaddingTop(); 20411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int targetScrollY = Math.min(nsvHost.getScrollY() + viewportHeight, 20421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.getScrollRange()); 20431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (targetScrollY != nsvHost.getScrollY()) { 20441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.smoothScrollTo(0, targetScrollY); 20451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 20461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 20491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: { 20501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() 20511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell - nsvHost.getPaddingTop(); 20521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int targetScrollY = Math.max(nsvHost.getScrollY() - viewportHeight, 0); 20531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (targetScrollY != nsvHost.getScrollY()) { 20541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.smoothScrollTo(0, targetScrollY); 20551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 20561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 20591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 20611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 20631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 20641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { 20651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onInitializeAccessibilityNodeInfo(host, info); 20661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 20671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.setClassName(ScrollView.class.getName()); 20681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.isEnabled()) { 20691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollRange = nsvHost.getScrollRange(); 20701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollRange > 0) { 20711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.setScrollable(true); 20721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.getScrollY() > 0) { 20731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD); 20741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.getScrollY() < scrollRange) { 20761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD); 20771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 20821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 20831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 20841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onInitializeAccessibilityEvent(host, event); 20851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 20861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell event.setClassName(ScrollView.class.getName()); 20871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean scrollable = nsvHost.getScrollRange() > 0; 208814d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas event.setScrollable(scrollable); 208914d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas event.setScrollX(nsvHost.getScrollX()); 209014d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas event.setScrollY(nsvHost.getScrollY()); 209114d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas AccessibilityRecordCompat.setMaxScrollX(event, nsvHost.getScrollX()); 209214d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas AccessibilityRecordCompat.setMaxScrollY(event, nsvHost.getScrollRange()); 20931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell} 2096