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 181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellpackage android.support.v4.widget; 191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 208e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikasimport static android.support.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; 261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Bundle; 271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Parcel; 281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Parcelable; 29c39d9c75590eca86a5e7e32a8824ba04a0d42e9bAlan Viveretteimport android.support.annotation.RestrictTo; 301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.AccessibilityDelegateCompat; 311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.InputDeviceCompat; 3276daed103193a1756535d1f59b165e98e1d17445Chris Banesimport android.support.v4.view.NestedScrollingChild2; 331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.NestedScrollingChildHelper; 341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.NestedScrollingParent; 351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.NestedScrollingParentHelper; 36c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Arakiimport android.support.v4.view.ScrollingView; 371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.ViewCompat; 381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.accessibility.AccessibilityNodeInfoCompat; 391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.accessibility.AccessibilityRecordCompat; 401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.util.AttributeSet; 411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.util.Log; 421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.util.TypedValue; 431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.FocusFinder; 441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.KeyEvent; 451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.MotionEvent; 461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.VelocityTracker; 471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.View; 481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.ViewConfiguration; 491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.ViewGroup; 501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.ViewParent; 511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.accessibility.AccessibilityEvent; 521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.view.animation.AnimationUtils; 53506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikasimport android.widget.EdgeEffect; 541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.widget.FrameLayout; 553035be16658d7652fdc472f971c81d8f7ffb60fdAurimas Liutikasimport android.widget.OverScroller; 561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.widget.ScrollView; 571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport java.util.List; 591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell/** 611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * NestedScrollView is just like {@link android.widget.ScrollView}, but it supports acting 621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * as both a nested scrolling parent and child on both new and old versions of Android. 631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Nested scrolling is enabled by default. 641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellpublic class NestedScrollView extends FrameLayout implements NestedScrollingParent, 6676daed103193a1756535d1f59b165e98e1d17445Chris Banes NestedScrollingChild2, ScrollingView { 671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static final int ANIMATED_SCROLL_GAP = 250; 681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static final float MAX_SCROLL_FACTOR = 0.5f; 701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final String TAG = "NestedScrollView"; 721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 73cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 74cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Interface definition for a callback to be invoked when the scroll 75cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * X or Y positions of a view change. 76cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 77cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * <p>This version of the interface works on all versions of Android, back to API v4.</p> 78cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 79cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see #setOnScrollChangeListener(OnScrollChangeListener) 80cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 81cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes public interface OnScrollChangeListener { 82cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 83cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Called when the scroll position of a view changes. 84cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 85cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param v The view whose scroll position has changed. 86cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param scrollX Current horizontal scroll origin. 87cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param scrollY Current vertical scroll origin. 88cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param oldScrollX Previous horizontal scroll origin. 89cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param oldScrollY Previous vertical scroll origin. 90cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 91cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes void onScrollChange(NestedScrollView v, int scrollX, int scrollY, 92cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes int oldScrollX, int oldScrollY); 93cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 94cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private long mLastScroll; 961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final Rect mTempRect = new Rect(); 983035be16658d7652fdc472f971c81d8f7ffb60fdAurimas Liutikas private OverScroller mScroller; 99506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas private EdgeEffect mEdgeGlowTop; 100506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas private EdgeEffect mEdgeGlowBottom; 1011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Position of the last motion event. 1041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mLastMotionY; 1061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * True when the layout has changed but the traversal has not come through yet. 1091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Ideally the view hierarchy would keep track of this for us. 1101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsLayoutDirty = true; 1121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsLaidOut = false; 1131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * The child to give focus to in the event that a child has requested focus while the 1161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * layout is dirty. This prevents the scroll from being wrong if the child has not been 1171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * laid out before requesting focus. 1181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private View mChildToScrollTo = null; 1201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * True if the user is currently dragging this ScrollView around. This is 1231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * not the same as 'is being flinged', which can be checked by 1241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * mScroller.isFinished() (flinging begins when the user lifts his finger). 1251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsBeingDragged = false; 1271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Determines speed during touch scrolling 1301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private VelocityTracker mVelocityTracker; 1321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * When set to true, the scroll view measure its child to make it fill the currently 1351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * visible area. 1361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mFillViewport; 1381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Whether arrow scrolling is animated. 1411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mSmoothScrollingEnabled = true; 1431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mTouchSlop; 1451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mMinimumVelocity; 1461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mMaximumVelocity; 1471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * ID of the active pointer. This is used to retain consistency during 1501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * drags/flings if multiple pointers are used. 1511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mActivePointerId = INVALID_POINTER; 1531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Used during scrolling to retrieve the new offset within the window. 1561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final int[] mScrollOffset = new int[2]; 1581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final int[] mScrollConsumed = new int[2]; 1591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mNestedYOffset; 1601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16176daed103193a1756535d1f59b165e98e1d17445Chris Banes private int mLastScrollerY; 16276daed103193a1756535d1f59b165e98e1d17445Chris Banes 1631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Sentinel value for no current active pointer. 1651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Used by {@link #mActivePointerId}. 1661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final int INVALID_POINTER = -1; 1681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private SavedState mSavedState; 1701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final AccessibilityDelegate ACCESSIBILITY_DELEGATE = new AccessibilityDelegate(); 1721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final int[] SCROLLVIEW_STYLEABLE = new int[] { 1741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell android.R.attr.fillViewport 1751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell }; 1761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final NestedScrollingParentHelper mParentHelper; 1781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final NestedScrollingChildHelper mChildHelper; 1791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private float mVerticalScrollFactor; 1811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 182cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes private OnScrollChangeListener mOnScrollChangeListener; 183cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 1841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public NestedScrollView(Context context) { 1851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell this(context, null); 1861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 1871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public NestedScrollView(Context context, AttributeSet attrs) { 1891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell this(context, attrs, 0); 1901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 1911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public NestedScrollView(Context context, AttributeSet attrs, int defStyleAttr) { 1931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(context, attrs, defStyleAttr); 1941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initScrollView(); 1951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final TypedArray a = context.obtainStyledAttributes( 1971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell attrs, SCROLLVIEW_STYLEABLE, defStyleAttr, 0); 1981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setFillViewport(a.getBoolean(0, false)); 2001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell a.recycle(); 2021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mParentHelper = new NestedScrollingParentHelper(this); 2041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper = new NestedScrollingChildHelper(this); 2051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // ...because why else would you be using this widget? 2071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setNestedScrollingEnabled(true); 2081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.setAccessibilityDelegate(this, ACCESSIBILITY_DELEGATE); 2101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // NestedScrollingChild 2131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setNestedScrollingEnabled(boolean enabled) { 2161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper.setNestedScrollingEnabled(enabled); 2171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isNestedScrollingEnabled() { 2211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.isNestedScrollingEnabled(); 2221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean startNestedScroll(int axes) { 2261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.startNestedScroll(axes); 2271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 23076daed103193a1756535d1f59b165e98e1d17445Chris Banes public boolean startNestedScroll(int axes, int type) { 23176daed103193a1756535d1f59b165e98e1d17445Chris Banes return mChildHelper.startNestedScroll(axes, type); 23276daed103193a1756535d1f59b165e98e1d17445Chris Banes } 23376daed103193a1756535d1f59b165e98e1d17445Chris Banes 23476daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 2351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void stopNestedScroll() { 2361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper.stopNestedScroll(); 2371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 24076daed103193a1756535d1f59b165e98e1d17445Chris Banes public void stopNestedScroll(int type) { 24176daed103193a1756535d1f59b165e98e1d17445Chris Banes mChildHelper.stopNestedScroll(type); 24276daed103193a1756535d1f59b165e98e1d17445Chris Banes } 24376daed103193a1756535d1f59b165e98e1d17445Chris Banes 24476daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 2451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean hasNestedScrollingParent() { 2461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.hasNestedScrollingParent(); 2471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 25076daed103193a1756535d1f59b165e98e1d17445Chris Banes public boolean hasNestedScrollingParent(int type) { 25176daed103193a1756535d1f59b165e98e1d17445Chris Banes return mChildHelper.hasNestedScrollingParent(type); 25276daed103193a1756535d1f59b165e98e1d17445Chris Banes } 25376daed103193a1756535d1f59b165e98e1d17445Chris Banes 25476daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 2551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, 2561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int dyUnconsumed, int[] offsetInWindow) { 2571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, 2581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetInWindow); 2591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 26276daed103193a1756535d1f59b165e98e1d17445Chris Banes public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, 26376daed103193a1756535d1f59b165e98e1d17445Chris Banes int dyUnconsumed, int[] offsetInWindow, int type) { 26476daed103193a1756535d1f59b165e98e1d17445Chris Banes return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, 26576daed103193a1756535d1f59b165e98e1d17445Chris Banes offsetInWindow, type); 26676daed103193a1756535d1f59b165e98e1d17445Chris Banes } 26776daed103193a1756535d1f59b165e98e1d17445Chris Banes 26876daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 2691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) { 2701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow); 2711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 27476daed103193a1756535d1f59b165e98e1d17445Chris Banes public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow, 27576daed103193a1756535d1f59b165e98e1d17445Chris Banes int type) { 27676daed103193a1756535d1f59b165e98e1d17445Chris Banes return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow, type); 27776daed103193a1756535d1f59b165e98e1d17445Chris Banes } 27876daed103193a1756535d1f59b165e98e1d17445Chris Banes 27976daed103193a1756535d1f59b165e98e1d17445Chris Banes @Override 2801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) { 2811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed); 2821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedPreFling(float velocityX, float velocityY) { 2861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedPreFling(velocityX, velocityY); 2871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // NestedScrollingParent 2901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 2931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0; 2941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedScrollAccepted(View child, View target, int nestedScrollAxes) { 2981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mParentHelper.onNestedScrollAccepted(child, target, nestedScrollAxes); 2991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL); 3001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onStopNestedScroll(View target) { 304cb3b6124a87f9116ce92fcf17f59287445c41442Chris Banes mParentHelper.onStopNestedScroll(target); 3051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell stopNestedScroll(); 3061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, 3101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int dyUnconsumed) { 3111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int oldScrollY = getScrollY(); 3121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, dyUnconsumed); 3131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int myConsumed = getScrollY() - oldScrollY; 3141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int myUnconsumed = dyUnconsumed - myConsumed; 3151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dispatchNestedScroll(0, myConsumed, 0, myUnconsumed, null); 3161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 320d370f75e50bf31d348d4e424ba8477ac77635f70Chris Banes dispatchNestedPreScroll(dx, dy, consumed, null); 3211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 3251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!consumed) { 3261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell flingWithNestedDispatch((int) velocityY); 3271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 3281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 3301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 334d370f75e50bf31d348d4e424ba8477ac77635f70Chris Banes return dispatchNestedPreFling(velocityX, velocityY); 3351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int getNestedScrollAxes() { 3391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mParentHelper.getNestedScrollAxes(); 3401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // ScrollView import 3431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 344e2104f4b5c8e3ad63570306a25e61502dfe4c418Aurimas Liutikas @Override 3451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean shouldDelayChildPressedState() { 3461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 3471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected float getTopFadingEdgeStrength() { 3511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 3521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0.0f; 3531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int length = getVerticalFadingEdgeLength(); 3561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 3571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollY < length) { 3581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollY / (float) length; 3591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 1.0f; 3621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected float getBottomFadingEdgeStrength() { 3661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 3671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0.0f; 3681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int length = getVerticalFadingEdgeLength(); 3711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottomEdge = getHeight() - getPaddingBottom(); 3721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int span = getChildAt(0).getBottom() - getScrollY() - bottomEdge; 3731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (span < length) { 3741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return span / (float) length; 3751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 1.0f; 3781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 3811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return The maximum amount this scroll view will scroll in response to 3821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * an arrow event. 3831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 3841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int getMaxScrollAmount() { 3851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (int) (MAX_SCROLL_FACTOR * getHeight()); 3861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initScrollView() { 3893035be16658d7652fdc472f971c81d8f7ffb60fdAurimas Liutikas mScroller = new OverScroller(getContext()); 3901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setFocusable(true); 3911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 3921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setWillNotDraw(false); 3931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewConfiguration configuration = ViewConfiguration.get(getContext()); 3941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTouchSlop = configuration.getScaledTouchSlop(); 3951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 3961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 3971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child) { 4011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child); 4061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, int index) { 4101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, index); 4151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, ViewGroup.LayoutParams params) { 4191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, params); 4241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 4271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, int index, ViewGroup.LayoutParams params) { 4281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 4301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, index, params); 4331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 436cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Register a callback to be invoked when the scroll X or Y positions of 437cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * this view change. 438cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * <p>This version of the method works on all versions of Android, back to API v4.</p> 439cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 440cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param l The listener to notify when the scroll X or Y position changes. 441cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see android.view.View#getScrollX() 442cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see android.view.View#getScrollY() 443cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 444cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes public void setOnScrollChangeListener(OnScrollChangeListener l) { 445cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes mOnScrollChangeListener = l; 446cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 447cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 448cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 4491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Returns true this ScrollView can be scrolled 4501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean canScroll() { 4521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 4531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (child != null) { 4541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeight = child.getHeight(); 4551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return getHeight() < childHeight + getPaddingTop() + getPaddingBottom(); 4561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 4581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 4611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Indicates whether this ScrollView's content is stretched to fill the viewport. 4621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 4631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return True if the content fills the viewport, false otherwise. 4641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 465929f27aab7ac7231f3734c988d5ee7201627d535Alan Viverette * @attr name android:fillViewport 4661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isFillViewport() { 4681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mFillViewport; 4691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 472236bf5bc5041e4bf356eac3855fd4fcf72cd6994Aurimas Liutikas * Set whether this ScrollView should stretch its content height to fill the viewport or not. 4731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 4741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param fillViewport True to stretch the content's height to the viewport's 4751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * boundaries, false otherwise. 4761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 477929f27aab7ac7231f3734c988d5ee7201627d535Alan Viverette * @attr name android:fillViewport 4781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setFillViewport(boolean fillViewport) { 4801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (fillViewport != mFillViewport) { 4811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mFillViewport = fillViewport; 4821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestLayout(); 4831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 4871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Whether arrow scrolling will animate its transition. 4881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isSmoothScrollingEnabled() { 4901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mSmoothScrollingEnabled; 4911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 4941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Set whether arrow scrolling will animate its transition. 4951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 4961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 4981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSmoothScrollingEnabled = smoothScrollingEnabled; 4991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 502cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes protected void onScrollChanged(int l, int t, int oldl, int oldt) { 503cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes super.onScrollChanged(l, t, oldl, oldt); 504cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 505cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes if (mOnScrollChangeListener != null) { 506cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes mOnScrollChangeListener.onScrollChange(this, l, t, oldl, oldt); 507cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 508cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 509cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 510cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes @Override 5111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 5121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onMeasure(widthMeasureSpec, heightMeasureSpec); 5131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mFillViewport) { 5151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 5161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 5191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (heightMode == MeasureSpec.UNSPECIFIED) { 5201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 5211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 5241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final View child = getChildAt(0); 5251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getMeasuredHeight(); 5261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (child.getMeasuredHeight() < height) { 5271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 5281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 5301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell getPaddingLeft() + getPaddingRight(), lp.width); 5311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell height -= getPaddingTop(); 5321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell height -= getPaddingBottom(); 5331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeightMeasureSpec = 5341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 5351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 5421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchKeyEvent(KeyEvent event) { 5431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Let the focused view and/or our descendants get the key first 5441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return super.dispatchKeyEvent(event) || executeKeyEvent(event); 5451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 5481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * You can call this function yourself to have the scroll view perform 5491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * scrolling from a key event, just as if the event had been dispatched to 5501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * it by the view hierarchy. 5511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 5521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param event The key event to execute. 5531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Return true if the event was handled, else false. 5541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 5551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean executeKeyEvent(KeyEvent event) { 5561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.setEmpty(); 5571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!canScroll()) { 5591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 5601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 5611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused == this) currentFocused = null; 5621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View nextFocused = FocusFinder.getInstance().findNextFocus(this, 5631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell currentFocused, View.FOCUS_DOWN); 5641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return nextFocused != null 5651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && nextFocused != this 5661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && nextFocused.requestFocus(View.FOCUS_DOWN); 5671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 5691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean handled = false; 5721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (event.getAction() == KeyEvent.ACTION_DOWN) { 5731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (event.getKeyCode()) { 5741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_DPAD_UP: 5751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!event.isAltPressed()) { 5761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = arrowScroll(View.FOCUS_UP); 5771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 5781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = fullScroll(View.FOCUS_UP); 5791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 5811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_DPAD_DOWN: 5821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!event.isAltPressed()) { 5831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = arrowScroll(View.FOCUS_DOWN); 5841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 5851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = fullScroll(View.FOCUS_DOWN); 5861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 5881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_SPACE: 5891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 5901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 5911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return handled; 5951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean inChild(int x, int y) { 5981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 5991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 6001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final View child = getChildAt(0); 6011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return !(y < child.getTop() - scrollY 6021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || y >= child.getBottom() - scrollY 6031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || x < child.getLeft() 6041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || x >= child.getRight()); 6051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 6071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initOrResetVelocityTracker() { 6101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker == null) { 6111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = VelocityTracker.obtain(); 6121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 6131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 6141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initVelocityTrackerIfNotExists() { 6181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker == null) { 6191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = VelocityTracker.obtain(); 6201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void recycleVelocityTracker() { 6241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 6251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.recycle(); 6261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = null; 6271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 6311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 6321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (disallowIntercept) { 6331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 6341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestDisallowInterceptTouchEvent(disallowIntercept); 6361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 6391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onInterceptTouchEvent(MotionEvent ev) { 6401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * This method JUST determines whether we want to intercept the motion. 6421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If we return true, onMotionEvent will be called and we do the actual 6431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * scrolling there. 6441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Shortcut the most recurring case: the user is in the dragging 6481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * state and he is moving his finger. We want to intercept this 6491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * motion. 6501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int action = ev.getAction(); 6521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 6531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 6541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6566ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas switch (action & MotionEvent.ACTION_MASK) { 6571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_MOVE: { 6581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 6601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * whether the user has moved far enough from his original down touch. 6611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Locally do absolute value. mLastMotionY is set to the y value 6651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * of the down event. 6661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int activePointerId = mActivePointerId; 6681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (activePointerId == INVALID_POINTER) { 6691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // If we don't have a valid id, the touch down wasn't on content. 6701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6731b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int pointerIndex = ev.findPointerIndex(activePointerId); 6741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pointerIndex == -1) { 6751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Log.e(TAG, "Invalid pointerId=" + activePointerId 6761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + " in onInterceptTouchEvent"); 6771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6801b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int y = (int) ev.getY(pointerIndex); 6811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int yDiff = Math.abs(y - mLastMotionY); 6821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (yDiff > mTouchSlop 6831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0) { 6841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = true; 6851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y; 6861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initVelocityTrackerIfNotExists(); 6871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(ev); 6881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset = 0; 6891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 6901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 6911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 6921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_DOWN: { 6981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int y = (int) ev.getY(); 69976daed103193a1756535d1f59b165e98e1d17445Chris Banes if (!inChild((int) ev.getX(), y)) { 7001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 7011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 7021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Remember location of down touch. 7071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * ACTION_DOWN always refers to pointer index 0. 7081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y; 7101b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(0); 7111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initOrResetVelocityTracker(); 7131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(ev); 7141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 715661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * If being flinged and user touches the screen, initiate drag; 716661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * otherwise don't. mScroller.isFinished should be false when 717661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * being flinged. We need to call computeScrollOffset() first so that 718661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * isFinished() is correct. 7191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 720661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes mScroller.computeScrollOffset(); 7211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = !mScroller.isFinished(); 72276daed103193a1756535d1f59b165e98e1d17445Chris Banes startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL, ViewCompat.TYPE_TOUCH); 7231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_CANCEL: 7271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_UP: 7281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Release the drag */ 7291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 7301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mActivePointerId = INVALID_POINTER; 7311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 73200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, getScrollRange())) { 73300db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes ViewCompat.postInvalidateOnAnimation(this); 73400db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 73576daed103193a1756535d1f59b165e98e1d17445Chris Banes stopNestedScroll(ViewCompat.TYPE_TOUCH); 7361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7376ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_POINTER_UP: 7381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onSecondaryPointerUp(ev); 7391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * The only time we want to intercept motion events is if we are in the 7441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * drag mode. 7451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mIsBeingDragged; 7471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 7501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onTouchEvent(MotionEvent ev) { 7511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initVelocityTrackerIfNotExists(); 7521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell MotionEvent vtev = MotionEvent.obtain(ev); 7541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7556ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final int actionMasked = ev.getActionMasked(); 7561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (actionMasked == MotionEvent.ACTION_DOWN) { 7581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset = 0; 7591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mNestedYOffset); 7611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (actionMasked) { 7631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_DOWN: { 7641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 7651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 7661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 7681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 7691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 7701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 7711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If being flinged and user touches, stop the fling. isFinished 7761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * will be false if being flinged. 7771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mScroller.isFinished()) { 7791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.abortAnimation(); 7801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Remember where the motion event started 7831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = (int) ev.getY(); 7841b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(0); 78576daed103193a1756535d1f59b165e98e1d17445Chris Banes startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL, ViewCompat.TYPE_TOUCH); 7861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_MOVE: 7891b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 7901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (activePointerIndex == -1) { 7911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 7921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7951b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int y = (int) ev.getY(activePointerIndex); 7961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int deltaY = mLastMotionY - y; 79776daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset, 79876daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.TYPE_TOUCH)) { 7991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY -= mScrollConsumed[1]; 8001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 8011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset += mScrollOffset[1]; 8021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { 8041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 8051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 8061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 8071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = true; 8091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (deltaY > 0) { 8101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY -= mTouchSlop; 8111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 8121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY += mTouchSlop; 8131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mIsBeingDragged) { 8161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Scroll to follow the motion event 8171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y - mScrollOffset[1]; 8181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int oldY = getScrollY(); 8201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 821e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final int overscrollMode = getOverScrollMode(); 822e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas boolean canOverscroll = overscrollMode == View.OVER_SCROLL_ALWAYS 823e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overscrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 8241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Calling overScrollByCompat will call onOverScrolled, which 8261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // calls onScrollChanged if applicable. 8271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (overScrollByCompat(0, deltaY, 0, getScrollY(), 0, range, 0, 82876daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, true) && !hasNestedScrollingParent(ViewCompat.TYPE_TOUCH)) { 8291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Break our velocity if we hit a scroll barrier. 8301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 8311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrolledDeltaY = getScrollY() - oldY; 8341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int unconsumedY = deltaY - scrolledDeltaY; 83576daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, mScrollOffset, 83676daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.TYPE_TOUCH)) { 8371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY -= mScrollOffset[1]; 8381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 8391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset += mScrollOffset[1]; 8401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (canOverscroll) { 8411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ensureGlows(); 8421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int pulledToY = oldY + deltaY; 8431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pulledToY < 0) { 844506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas EdgeEffectCompat.onPull(mEdgeGlowTop, (float) deltaY / getHeight(), 8451b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov ev.getX(activePointerIndex) / getWidth()); 8461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowBottom.isFinished()) { 8471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onRelease(); 8481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (pulledToY > range) { 850506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas EdgeEffectCompat.onPull(mEdgeGlowBottom, (float) deltaY / getHeight(), 8511b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov 1.f - ev.getX(activePointerIndex) 8521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell / getWidth()); 8531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowTop.isFinished()) { 8541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onRelease(); 8551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null 8581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 8591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 8601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_UP: 86576daed103193a1756535d1f59b165e98e1d17445Chris Banes final VelocityTracker velocityTracker = mVelocityTracker; 86676daed103193a1756535d1f59b165e98e1d17445Chris Banes velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 86776daed103193a1756535d1f59b165e98e1d17445Chris Banes int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 86876daed103193a1756535d1f59b165e98e1d17445Chris Banes if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 86976daed103193a1756535d1f59b165e98e1d17445Chris Banes flingWithNestedDispatch(-initialVelocity); 87076daed103193a1756535d1f59b165e98e1d17445Chris Banes } else if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, 87176daed103193a1756535d1f59b165e98e1d17445Chris Banes getScrollRange())) { 87276daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.postInvalidateOnAnimation(this); 8731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 874ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes mActivePointerId = INVALID_POINTER; 875ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes endDrag(); 8761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_CANCEL: 8781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mIsBeingDragged && getChildCount() > 0) { 87900db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, 88000db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes getScrollRange())) { 88100db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes ViewCompat.postInvalidateOnAnimation(this); 88200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 8831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 884ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes mActivePointerId = INVALID_POINTER; 885ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes endDrag(); 8861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8876ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_POINTER_DOWN: { 8886ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final int index = ev.getActionIndex(); 8891b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(index); 8901b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(index); 8911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8936ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_POINTER_UP: 8941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onSecondaryPointerUp(ev); 8951b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); 8961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 9001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(vtev); 9011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.recycle(); 9031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 9041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void onSecondaryPointerUp(MotionEvent ev) { 9076ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final int pointerIndex = ev.getActionIndex(); 9081b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int pointerId = ev.getPointerId(pointerIndex); 9091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pointerId == mActivePointerId) { 9101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // This was our active pointer going up. Choose a new 9111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // active pointer and adjust accordingly. 9121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // TODO: Make this decision more intelligent. 9131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 9141b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(newPointerIndex); 9151b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(newPointerIndex); 9161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 9171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 9181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 922e2104f4b5c8e3ad63570306a25e61502dfe4c418Aurimas Liutikas @Override 9231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onGenericMotionEvent(MotionEvent event) { 9241b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov if ((event.getSource() & InputDeviceCompat.SOURCE_CLASS_POINTER) != 0) { 9251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (event.getAction()) { 9266ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas case MotionEvent.ACTION_SCROLL: { 9271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsBeingDragged) { 9286ed40c1f86bcb172a1f0f069cde1c571a7781aeeAurimas Liutikas final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 9291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (vscroll != 0) { 9301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int delta = (int) (vscroll * getVerticalScrollFactorCompat()); 9311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 9321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int oldScrollY = getScrollY(); 9331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollY = oldScrollY - delta; 9341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY < 0) { 9351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = 0; 9361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollY > range) { 9371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = range; 9381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY != oldScrollY) { 9401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(getScrollX(), newScrollY); 9411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 9421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 9491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private float getVerticalScrollFactorCompat() { 9521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVerticalScrollFactor == 0) { 9531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell TypedValue outValue = new TypedValue(); 9541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final Context context = getContext(); 9551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!context.getTheme().resolveAttribute( 9561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell android.R.attr.listPreferredItemHeight, outValue, true)) { 9571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException( 9581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell "Expected theme to define listPreferredItemHeight."); 9591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVerticalScrollFactor = outValue.getDimension( 9611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell context.getResources().getDisplayMetrics()); 9621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mVerticalScrollFactor; 9641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 96615375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 9671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 9681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedX, boolean clampedY) { 9691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(scrollX, scrollY); 9701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean overScrollByCompat(int deltaX, int deltaY, 9731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollX, int scrollY, 9741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRangeX, int scrollRangeY, 9751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int maxOverScrollX, int maxOverScrollY, 9761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean isTouchEvent) { 977e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final int overScrollMode = getOverScrollMode(); 9781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean canScrollHorizontal = 9791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 9801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean canScrollVertical = 9811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell computeVerticalScrollRange() > computeVerticalScrollExtent(); 982e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final boolean overScrollHorizontal = overScrollMode == View.OVER_SCROLL_ALWAYS 983e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 984e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final boolean overScrollVertical = overScrollMode == View.OVER_SCROLL_ALWAYS 985e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 9861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollX = scrollX + deltaX; 9881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!overScrollHorizontal) { 9891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell maxOverScrollX = 0; 9901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollY = scrollY + deltaY; 9931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!overScrollVertical) { 9941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell maxOverScrollY = 0; 9951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Clamp values if at the limits and record 9981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int left = -maxOverScrollX; 9991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int right = maxOverScrollX + scrollRangeX; 10001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int top = -maxOverScrollY; 10011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottom = maxOverScrollY + scrollRangeY; 10021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedX = false; 10041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollX > right) { 10051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollX = right; 10061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedX = true; 10071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollX < left) { 10081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollX = left; 10091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedX = true; 10101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedY = false; 10131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY > bottom) { 10141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = bottom; 10151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedY = true; 10161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollY < top) { 10171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = top; 10181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedY = true; 10191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 102176daed103193a1756535d1f59b165e98e1d17445Chris Banes if (clampedY && !hasNestedScrollingParent(ViewCompat.TYPE_NON_TOUCH)) { 102200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes mScroller.springBack(newScrollX, newScrollY, 0, 0, 0, getScrollRange()); 102300db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 102400db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes 10251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 10261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return clampedX || clampedY; 10281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1030540222c3675801eaa141ace1c164c4d3499b4721Aurimas Liutikas int getScrollRange() { 10311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRange = 0; 10321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 10331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 10341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange = Math.max(0, 10351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop())); 10361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollRange; 10381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 10411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p> 10421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Finds the next focusable component that fits in the specified bounds. 10431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * </p> 10441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 10451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param topFocus look for a candidate is the one at the top of the bounds 10461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * if topFocus is true, or at the bottom of the bounds if topFocus is 10471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * false 10481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param top the top offset of the bounds in which a focusable must be 10491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * found 10501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param bottom the bottom offset of the bounds in which a focusable must 10511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * be found 10521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return the next focusable component in the bounds or null if none can 10531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * be found 10541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 10561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell List<View> focusables = getFocusables(View.FOCUS_FORWARD); 10581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View focusCandidate = null; 10591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 10611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * A fully contained focusable is one where its top is below the bound's 10621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * top, and its bottom is above the bound's bottom. A partially 10631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * contained focusable is one where some part of it is within the 10641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * bounds, but it also has some part that is not within bounds. A fully contained 10651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focusable is preferred to a partially contained focusable. 10661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean foundFullyContainedFocusable = false; 10681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = focusables.size(); 10701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell for (int i = 0; i < count; i++) { 10711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = focusables.get(i); 10721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int viewTop = view.getTop(); 10731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int viewBottom = view.getBottom(); 10741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (top < viewBottom && viewTop < bottom) { 10761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 10771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * the focusable is in the target area, it is a candidate for 10781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focusing 10791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10814d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final boolean viewIsFullyContained = (top < viewTop) && (viewBottom < bottom); 10821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (focusCandidate == null) { 10841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* No candidate, take this one */ 10851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 10861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell foundFullyContainedFocusable = viewIsFullyContained; 10871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 10881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean viewIsCloserToBoundary = 10894d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas (topFocus && viewTop < focusCandidate.getTop()) 10904d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas || (!topFocus && viewBottom > focusCandidate.getBottom()); 10911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (foundFullyContainedFocusable) { 10931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (viewIsFullyContained && viewIsCloserToBoundary) { 10941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 10951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * We're dealing with only fully contained views, so 10961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * it has to be closer to the boundary to beat our 10971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * candidate 10981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 11001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 11021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (viewIsFullyContained) { 11031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Any fully contained view beats a partially contained view */ 11041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 11051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell foundFullyContainedFocusable = true; 11061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (viewIsCloserToBoundary) { 11071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 11081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Partially contained view beats another partially 11091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * contained view if it's closer 11101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 11121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return focusCandidate; 11191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 11221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Handles scrolling in response to a "page up/down" shortcut press. This 11231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * method will scroll the view by one page up or down and give the focus 11241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to the topmost/bottommost component in the new visible area. If no 11251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * component is a good candidate for focus, this scrollview reclaims the 11261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focus.</p> 11271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 11281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 11291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go one page up or 11301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@link android.view.View#FOCUS_DOWN} to go one page down 11311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 11321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean pageScroll(int direction) { 11341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean down = direction == View.FOCUS_DOWN; 11351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 11361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (down) { 11381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = getScrollY() + height; 11391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = getChildCount(); 11401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count > 0) { 11411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = getChildAt(count - 1); 11421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mTempRect.top + height > view.getBottom()) { 11431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = view.getBottom() - height; 11441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 11471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = getScrollY() - height; 11481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mTempRect.top < 0) { 11491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = 0; 11501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = mTempRect.top + height; 11531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 11551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 11581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Handles scrolling in response to a "home/end" shortcut press. This 11591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * method will scroll the view to the top or bottom and give the focus 11601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to the topmost/bottommost component in the new visible area. If no 11611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * component is a good candidate for focus, this scrollview reclaims the 11621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focus.</p> 11631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 11641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 11651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go the top of the view or 11661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@link android.view.View#FOCUS_DOWN} to go the bottom 11671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 11681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean fullScroll(int direction) { 11701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean down = direction == View.FOCUS_DOWN; 11711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 11721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = 0; 11741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = height; 11751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (down) { 11771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = getChildCount(); 11781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count > 0) { 11791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = getChildAt(count - 1); 11801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = view.getBottom() + getPaddingBottom(); 11811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = mTempRect.bottom - height; 11821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 11861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 11891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Scrolls the view to make the area defined by <code>top</code> and 11901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <code>bottom</code> visible. This method attempts to give the focus 11911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to a component visible in this area. If no component can be focused in 11921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * the new visible area, the focus is reclaimed by this ScrollView.</p> 11931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 11941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 11951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 11961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param top the top offset of the new area to be made visible 11971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param bottom the bottom offset of the new area to be made visible 11981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 11991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean scrollAndFocus(int direction, int top, int bottom) { 12011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean handled = true; 12021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 12041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int containerTop = getScrollY(); 12051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int containerBottom = containerTop + height; 12061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean up = direction == View.FOCUS_UP; 12071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View newFocused = findFocusableViewInBounds(up, top, bottom); 12091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newFocused == null) { 12101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newFocused = this; 12111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (top >= containerTop && bottom <= containerBottom) { 12141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = false; 12151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 12161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int delta = up ? (top - containerTop) : (bottom - containerBottom); 12171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(delta); 12181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newFocused != findFocus()) newFocused.requestFocus(direction); 12211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return handled; 12231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Handle scrolling in response to an up or down arrow click. 12271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 12281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction The direction corresponding to the arrow key that was 12291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * pressed 12301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return True if we consumed the event, false otherwise 12311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean arrowScroll(int direction) { 12331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 12351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused == this) currentFocused = null; 12361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 12381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int maxJump = getMaxScrollAmount(); 12401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 12421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nextFocused.getDrawingRect(mTempRect); 12431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(nextFocused, mTempRect); 12441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(scrollDelta); 12461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nextFocused.requestFocus(direction); 12471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 12481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // no new focus 12491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = maxJump; 12501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 12521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollDelta = getScrollY(); 12531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (direction == View.FOCUS_DOWN) { 12541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 12551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int daBottom = getChildAt(0).getBottom(); 12561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenBottom = getScrollY() + getHeight() - getPaddingBottom(); 12571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (daBottom - screenBottom < maxJump) { 12581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollDelta = daBottom - screenBottom; 12591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollDelta == 0) { 12631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 12641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 12661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused != null && currentFocused.isFocused() 12691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && isOffScreen(currentFocused)) { 12701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // previously focused item still has focus and is off screen, give 12711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // it up (take it back to ourselves) 12721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 12731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // sure to 12741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // get it) 12751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int descendantFocusability = getDescendantFocusability(); // save 12761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 12771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestFocus(); 12781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(descendantFocusability); // restore 12791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 12811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return whether the descendant of this scroll view is scrolled off 12851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * screen. 12861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean isOffScreen(View descendant) { 12881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 12891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return whether the descendant of this scroll view is within delta 12931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * pixels of being on the screen. 12941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 12961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell descendant.getDrawingRect(mTempRect); 12971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(descendant, mTempRect); 12981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (mTempRect.bottom + delta) >= getScrollY() 13001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (mTempRect.top - delta) <= (getScrollY() + height); 13011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Smooth scroll by a Y delta 13051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 13061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param delta the number of pixels to scroll by on the Y axis 13071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void doScrollY(int delta) { 13091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (delta != 0) { 13101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mSmoothScrollingEnabled) { 13111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(0, delta); 13121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 13131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, delta); 13141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 13201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 13211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param dx the number of pixels to scroll by on the X axis 13221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param dy the number of pixels to scroll by on the Y axis 13231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public final void smoothScrollBy(int dx, int dy) { 13251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 13261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Nothing to do. 13271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 13281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 13301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (duration > ANIMATED_SCROLL_GAP) { 13311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int height = getHeight() - getPaddingBottom() - getPaddingTop(); 13321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottom = getChildAt(0).getHeight(); 13331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int maxY = Math.max(0, bottom - height); 13341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 13351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 13361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.startScroll(getScrollX(), scrollY, 0, dy); 13381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 13391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 13401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mScroller.isFinished()) { 13411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.abortAnimation(); 13421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(dx, dy); 13441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 13461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 13501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 13511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param x the position where to scroll on the X axis 13521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param y the position where to scroll on the Y axis 13531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public final void smoothScrollTo(int x, int y) { 13551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(x - getScrollX(), y - getScrollY()); 13561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>The scroll range of a scroll view is the overall height of all of its 13601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * children.</p> 1361c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki * @hide 13621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13638e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 13641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 1365c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollRange() { 13661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int count = getChildCount(); 13671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int contentHeight = getHeight() - getPaddingBottom() - getPaddingTop(); 13681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count == 0) { 13691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return contentHeight; 13701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRange = getChildAt(0).getBottom(); 13731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 13741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 13751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollY < 0) { 13761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange -= scrollY; 13771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (scrollY > overscrollBottom) { 13781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange += scrollY - overscrollBottom; 13791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollRange; 13821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1384c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 13858e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 13861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 1387c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollOffset() { 13881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return Math.max(0, super.computeVerticalScrollOffset()); 13891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1391c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 13928e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1393c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1394c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollExtent() { 1395c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeVerticalScrollExtent(); 1396c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1397c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1398c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 13998e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1400c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1401c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollRange() { 1402c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollRange(); 1403c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1404c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1405c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 14068e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1407c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1408c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollOffset() { 1409c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollOffset(); 1410c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1411c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1412c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 14138e10080c914d1ad0784394fa3026b85535535847Aurimas Liutikas @RestrictTo(LIBRARY_GROUP) 1414c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1415c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollExtent() { 1416c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollExtent(); 1417c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1418c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 14191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 14204d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas protected void measureChild(View child, int parentWidthMeasureSpec, 14214d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas int parentHeightMeasureSpec) { 14221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewGroup.LayoutParams lp = child.getLayoutParams(); 14231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childWidthMeasureSpec; 14251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeightMeasureSpec; 14261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, getPaddingLeft() 14281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + getPaddingRight(), lp.width); 14291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 14311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 14331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 14361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 14371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int parentHeightMeasureSpec, int heightUsed) { 14381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 14391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 14411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin 14421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + widthUsed, lp.width); 14431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 14441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 14451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 14471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 14501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void computeScroll() { 14511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mScroller.computeScrollOffset()) { 145276daed103193a1756535d1f59b165e98e1d17445Chris Banes final int x = mScroller.getCurrX(); 145376daed103193a1756535d1f59b165e98e1d17445Chris Banes final int y = mScroller.getCurrY(); 145476daed103193a1756535d1f59b165e98e1d17445Chris Banes 145576daed103193a1756535d1f59b165e98e1d17445Chris Banes int dy = y - mLastScrollerY; 14561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 145776daed103193a1756535d1f59b165e98e1d17445Chris Banes // Dispatch up to parent 145876daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dispatchNestedPreScroll(0, dy, mScrollConsumed, null, ViewCompat.TYPE_NON_TOUCH)) { 145976daed103193a1756535d1f59b165e98e1d17445Chris Banes dy -= mScrollConsumed[1]; 146076daed103193a1756535d1f59b165e98e1d17445Chris Banes } 146176daed103193a1756535d1f59b165e98e1d17445Chris Banes 146276daed103193a1756535d1f59b165e98e1d17445Chris Banes if (dy != 0) { 14631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 146476daed103193a1756535d1f59b165e98e1d17445Chris Banes final int oldScrollY = getScrollY(); 146576daed103193a1756535d1f59b165e98e1d17445Chris Banes 146676daed103193a1756535d1f59b165e98e1d17445Chris Banes overScrollByCompat(0, dy, getScrollX(), oldScrollY, 0, range, 0, 0, false); 146776daed103193a1756535d1f59b165e98e1d17445Chris Banes 146876daed103193a1756535d1f59b165e98e1d17445Chris Banes final int scrolledDeltaY = getScrollY() - oldScrollY; 146976daed103193a1756535d1f59b165e98e1d17445Chris Banes final int unconsumedY = dy - scrolledDeltaY; 147076daed103193a1756535d1f59b165e98e1d17445Chris Banes 147176daed103193a1756535d1f59b165e98e1d17445Chris Banes if (!dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, null, 147276daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.TYPE_NON_TOUCH)) { 147376daed103193a1756535d1f59b165e98e1d17445Chris Banes final int mode = getOverScrollMode(); 147476daed103193a1756535d1f59b165e98e1d17445Chris Banes final boolean canOverscroll = mode == OVER_SCROLL_ALWAYS 147576daed103193a1756535d1f59b165e98e1d17445Chris Banes || (mode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 147676daed103193a1756535d1f59b165e98e1d17445Chris Banes if (canOverscroll) { 147776daed103193a1756535d1f59b165e98e1d17445Chris Banes ensureGlows(); 147876daed103193a1756535d1f59b165e98e1d17445Chris Banes if (y <= 0 && oldScrollY > 0) { 147976daed103193a1756535d1f59b165e98e1d17445Chris Banes mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 148076daed103193a1756535d1f59b165e98e1d17445Chris Banes } else if (y >= range && oldScrollY < range) { 148176daed103193a1756535d1f59b165e98e1d17445Chris Banes mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 148276daed103193a1756535d1f59b165e98e1d17445Chris Banes } 14831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 148676daed103193a1756535d1f59b165e98e1d17445Chris Banes 148776daed103193a1756535d1f59b165e98e1d17445Chris Banes // Finally update the scroll positions and post an invalidation 148876daed103193a1756535d1f59b165e98e1d17445Chris Banes mLastScrollerY = y; 148976daed103193a1756535d1f59b165e98e1d17445Chris Banes ViewCompat.postInvalidateOnAnimation(this); 149076daed103193a1756535d1f59b165e98e1d17445Chris Banes } else { 149176daed103193a1756535d1f59b165e98e1d17445Chris Banes // We can't scroll any more, so stop any indirect scrolling 149276daed103193a1756535d1f59b165e98e1d17445Chris Banes if (hasNestedScrollingParent(ViewCompat.TYPE_NON_TOUCH)) { 149376daed103193a1756535d1f59b165e98e1d17445Chris Banes stopNestedScroll(ViewCompat.TYPE_NON_TOUCH); 149476daed103193a1756535d1f59b165e98e1d17445Chris Banes } 149576daed103193a1756535d1f59b165e98e1d17445Chris Banes // and reset the scroller y 149676daed103193a1756535d1f59b165e98e1d17445Chris Banes mLastScrollerY = 0; 14971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 15011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Scrolls the view to the given child. 15021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 15031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param child the View to scroll to 15041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 15051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void scrollToChild(View child) { 15061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getDrawingRect(mTempRect); 15071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Offset from child's local coordinates to ScrollView coordinates */ 15091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(child, mTempRect); 15101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 15121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollDelta != 0) { 15141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, scrollDelta); 15151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 15191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If rect is off screen, scroll just enough to get it (or at least the 15201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * first screen size chunk of it) on screen. 15211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 15221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param rect The rectangle. 15231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param immediate True to scroll immediately without animation 15241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if scrolling was performed 15251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 15261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean scrollToChildRect(Rect rect, boolean immediate) { 15271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 15281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean scroll = delta != 0; 15291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scroll) { 15301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (immediate) { 15311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, delta); 15321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 15331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(0, delta); 15341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scroll; 15371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 15401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Compute the amount to scroll in the Y direction in order to get 15411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * a rectangle completely on the screen (or, if taller than the screen, 15421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * at least the first screen size chunk of it). 15431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 15441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param rect The rect. 15451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return The scroll delta. 15461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 15471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 15481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) return 0; 15491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 15511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenTop = getScrollY(); 15521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenBottom = screenTop + height; 15531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int fadingEdge = getVerticalFadingEdgeLength(); 15551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // leave room for top fading edge as long as rect isn't at very top 15571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.top > 0) { 15581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell screenTop += fadingEdge; 15591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // leave room for bottom fading edge as long as rect isn't at very bottom 15621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.bottom < getChildAt(0).getHeight()) { 15631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell screenBottom -= fadingEdge; 15641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollYDelta = 0; 15671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.bottom > screenBottom && rect.top > screenTop) { 15691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // need to move down to get it in view: move down just enough so 15701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // that the entire rectangle is in view (or at least the first 15711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen size chunk). 15721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.height() > height) { 15741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // just enough to get screen size chunk on 15751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta += (rect.top - screenTop); 15761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 15771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // get entire rect at bottom of screen 15781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta += (rect.bottom - screenBottom); 15791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // make sure we aren't scrolling beyond the end of our content 15821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int bottom = getChildAt(0).getBottom(); 15831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int distanceToBottom = bottom - screenBottom; 15841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 15851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (rect.top < screenTop && rect.bottom < screenBottom) { 15871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // need to move up to get it in view: move up just enough so that 15881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // entire rectangle is in view (or at least the first screen 15891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // size chunk of it). 15901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.height() > height) { 15921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen size chunk 15931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta -= (screenBottom - rect.bottom); 15941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 15951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // entire rect at top 15961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta -= (screenTop - rect.top); 15971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // make sure we aren't scrolling any further than the top our content 16001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 16011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollYDelta; 16031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestChildFocus(View child, View focused) { 16071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsLayoutDirty) { 16081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollToChild(focused); 16091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 16101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // The child may not be laid out yet, we can't compute the scroll yet 16111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildToScrollTo = focused; 16121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestChildFocus(child, focused); 16141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 16181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * When looking for focus in children of a scroll view, need to be a little 16191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * more careful not to give focus to something that is scrolled off screen. 16201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 16211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * This is more expensive than the default {@link android.view.ViewGroup} 16221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * implementation, otherwise this behavior might have been made the default. 16231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 16241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected boolean onRequestFocusInDescendants(int direction, 16261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Rect previouslyFocusedRect) { 16271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // convert from forward / backward notation to up / down / left / right 16291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // (ugh). 16301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (direction == View.FOCUS_FORWARD) { 16311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell direction = View.FOCUS_DOWN; 16321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (direction == View.FOCUS_BACKWARD) { 16331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell direction = View.FOCUS_UP; 16341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16364d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final View nextFocus = previouslyFocusedRect == null 16374d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas ? FocusFinder.getInstance().findNextFocus(this, null, direction) 16384d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas : FocusFinder.getInstance().findNextFocusFromRect( 16394d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas this, previouslyFocusedRect, direction); 16401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nextFocus == null) { 16421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 16431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isOffScreen(nextFocus)) { 16461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 16471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return nextFocus.requestFocus(direction, previouslyFocusedRect); 16501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 16541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean immediate) { 16551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // offset into coordinate space of this scroll view 16561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell rectangle.offset(child.getLeft() - child.getScrollX(), 16571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getTop() - child.getScrollY()); 16581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollToChildRect(rectangle, immediate); 16601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestLayout() { 16641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLayoutDirty = true; 16651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestLayout(); 16661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onLayout(boolean changed, int l, int t, int r, int b) { 16701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onLayout(changed, l, t, r, b); 16711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLayoutDirty = false; 16721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Give a child focus if it needs it 16731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 16741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollToChild(mChildToScrollTo); 16751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildToScrollTo = null; 16771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsLaidOut) { 16791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mSavedState != null) { 16801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), mSavedState.scrollPosition); 16811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSavedState = null; 16821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } // mScrollY default value is "0" 16831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; 16851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollRange = Math.max(0, 16861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childHeight - (b - t - getPaddingBottom() - getPaddingTop())); 16871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Don't forget to clamp 16891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getScrollY() > scrollRange) { 16901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), scrollRange); 16911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (getScrollY() < 0) { 16921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), 0); 16931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Calling this with the present values causes it to re-claim them 16971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), getScrollY()); 16981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLaidOut = true; 16991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onAttachedToWindow() { 1703d344e81ad956ec445038f5ba2ca2ebd1831b1f8aAlan Viverette super.onAttachedToWindow(); 1704d344e81ad956ec445038f5ba2ca2ebd1831b1f8aAlan Viverette 17051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLaidOut = false; 17061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onSizeChanged(int w, int h, int oldw, int oldh) { 17101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onSizeChanged(w, h, oldw, oldh); 17111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 17134d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas if (null == currentFocused || this == currentFocused) { 17141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 17154d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas } 17161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // If the currently-focused view was visible on the screen when the 17181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen was at the old height, then scroll the screen to make that 17191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // view visible with the new screen height. 17201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 17211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell currentFocused.getDrawingRect(mTempRect); 17221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(currentFocused, mTempRect); 17231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 17241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(scrollDelta); 17251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 17291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Return true if child is a descendant of parent, (or equal to the parent). 17301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 17311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static boolean isViewDescendantOf(View child, View parent) { 17321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (child == parent) { 17331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 17341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent theParent = child.getParent(); 17371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 17381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 17411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Fling the scroll view 17421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 17431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param velocityY The initial velocity in the Y direction. Positive 17441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * numbers mean that the finger/cursor is moving down the screen, 17451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * which means we want to scroll towards the top. 17461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 17471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void fling(int velocityY) { 17481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 174976daed103193a1756535d1f59b165e98e1d17445Chris Banes startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL, ViewCompat.TYPE_NON_TOUCH); 175076daed103193a1756535d1f59b165e98e1d17445Chris Banes mScroller.fling(getScrollX(), getScrollY(), // start 175176daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, velocityY, // velocities 175276daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, 0, // x 175376daed103193a1756535d1f59b165e98e1d17445Chris Banes Integer.MIN_VALUE, Integer.MAX_VALUE, // y 175476daed103193a1756535d1f59b165e98e1d17445Chris Banes 0, 0); // overscroll 175576daed103193a1756535d1f59b165e98e1d17445Chris Banes mLastScrollerY = getScrollY(); 17561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 17571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void flingWithNestedDispatch(int velocityY) { 17611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 17624d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final boolean canFling = (scrollY > 0 || velocityY > 0) 17634d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas && (scrollY < getScrollRange() || velocityY < 0); 17641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!dispatchNestedPreFling(0, velocityY)) { 17651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dispatchNestedFling(0, velocityY, canFling); 176676daed103193a1756535d1f59b165e98e1d17445Chris Banes fling(velocityY); 17671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void endDrag() { 17711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 17721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 177476daed103193a1756535d1f59b165e98e1d17445Chris Banes stopNestedScroll(ViewCompat.TYPE_TOUCH); 17751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null) { 17771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onRelease(); 17781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onRelease(); 17791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 17831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@inheritDoc} 17841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 17851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>This version also clamps the scrolling to the bounds of our child. 17861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 17871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void scrollTo(int x, int y) { 17891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // we rely on the fact the View.scrollBy calls scrollTo. 17901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 17911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 17921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth()); 17931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight()); 17941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (x != getScrollX() || y != getScrollY()) { 17951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(x, y); 17961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void ensureGlows() { 1801e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas if (getOverScrollMode() != View.OVER_SCROLL_NEVER) { 18021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop == null) { 18031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Context context = getContext(); 1804506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas mEdgeGlowTop = new EdgeEffect(context); 1805506695b4cf6b22d70d2e3647d94551e721ee0430Aurimas Liutikas mEdgeGlowBottom = new EdgeEffect(context); 18061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 18081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop = null; 18091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom = null; 18101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void draw(Canvas canvas) { 18151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.draw(canvas); 18161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null) { 18171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 18181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowTop.isFinished()) { 18191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int restoreCount = canvas.save(); 18201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int width = getWidth() - getPaddingLeft() - getPaddingRight(); 18211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.translate(getPaddingLeft(), Math.min(0, scrollY)); 18231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.setSize(width, getHeight()); 18241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop.draw(canvas)) { 18251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 18261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.restoreToCount(restoreCount); 18281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowBottom.isFinished()) { 18301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int restoreCount = canvas.save(); 18311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int width = getWidth() - getPaddingLeft() - getPaddingRight(); 18321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int height = getHeight(); 18331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.translate(-width + getPaddingLeft(), 18351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Math.max(getScrollRange(), scrollY) + height); 18361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.rotate(180, width, 0); 18371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.setSize(width, height); 18381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 18391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 18401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.restoreToCount(restoreCount); 18421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static int clamp(int n, int my, int child) { 18471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (my >= child || n < 0) { 18481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* my >= child is this case: 18491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 18501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 18511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * or 18521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 18531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 18541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * or 18551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 18561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 18571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 18581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * n < 0 is this case: 18591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ me ------| 18601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-------- child --------| 18611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-- mScrollX --| 18621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 18631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0; 18641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18654d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas if ((my + n) > child) { 18661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* this case: 18671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ me ------| 18681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 18691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-- mScrollX --| 18701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 18714d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas return child - my; 18721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return n; 18741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onRestoreInstanceState(Parcelable state) { 1878bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas if (!(state instanceof SavedState)) { 1879bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas super.onRestoreInstanceState(state); 1880bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas return; 1881bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas } 1882bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas 18831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState ss = (SavedState) state; 18841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onRestoreInstanceState(ss.getSuperState()); 18851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSavedState = ss; 18861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestLayout(); 18871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected Parcelable onSaveInstanceState() { 18911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Parcelable superState = super.onSaveInstanceState(); 18921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState ss = new SavedState(superState); 18931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ss.scrollPosition = getScrollY(); 18941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return ss; 18951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static class SavedState extends BaseSavedState { 18981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int scrollPosition; 18991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState(Parcelable superState) { 19011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(superState); 19021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19044d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas SavedState(Parcel source) { 19051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(source); 19061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollPosition = source.readInt(); 19071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void writeToParcel(Parcel dest, int flags) { 19111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.writeToParcel(dest, flags); 19121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dest.writeInt(scrollPosition); 19131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public String toString() { 19171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return "HorizontalScrollView.SavedState{" 19181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + Integer.toHexString(System.identityHashCode(this)) 19191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + " scrollPosition=" + scrollPosition + "}"; 19201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19224d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas public static final Parcelable.Creator<SavedState> CREATOR = 19234d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas new Parcelable.Creator<SavedState>() { 192415375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 19251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public SavedState createFromParcel(Parcel in) { 19261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return new SavedState(in); 19271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 192915375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 19301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public SavedState[] newArray(int size) { 19311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return new SavedState[size]; 19321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell }; 19341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static class AccessibilityDelegate extends AccessibilityDelegateCompat { 19371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean performAccessibilityAction(View host, int action, Bundle arguments) { 19391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (super.performAccessibilityAction(host, action, arguments)) { 19401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 19411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 19431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!nsvHost.isEnabled()) { 19441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 19451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (action) { 19471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: { 19481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() 19491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell - nsvHost.getPaddingTop(); 19501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int targetScrollY = Math.min(nsvHost.getScrollY() + viewportHeight, 19511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.getScrollRange()); 19521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (targetScrollY != nsvHost.getScrollY()) { 19531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.smoothScrollTo(0, targetScrollY); 19541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 19551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 19581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: { 19591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() 19601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell - nsvHost.getPaddingTop(); 19611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int targetScrollY = Math.max(nsvHost.getScrollY() - viewportHeight, 0); 19621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (targetScrollY != nsvHost.getScrollY()) { 19631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.smoothScrollTo(0, targetScrollY); 19641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 19651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 19681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 19701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { 19741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onInitializeAccessibilityNodeInfo(host, info); 19751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 19761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.setClassName(ScrollView.class.getName()); 19771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.isEnabled()) { 19781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollRange = nsvHost.getScrollRange(); 19791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollRange > 0) { 19801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.setScrollable(true); 19811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.getScrollY() > 0) { 19821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD); 19831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.getScrollY() < scrollRange) { 19851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD); 19861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 19931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onInitializeAccessibilityEvent(host, event); 19941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 19951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell event.setClassName(ScrollView.class.getName()); 19961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean scrollable = nsvHost.getScrollRange() > 0; 199714d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas event.setScrollable(scrollable); 199814d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas event.setScrollX(nsvHost.getScrollX()); 199914d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas event.setScrollY(nsvHost.getScrollY()); 200014d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas AccessibilityRecordCompat.setMaxScrollX(event, nsvHost.getScrollX()); 200114d02ef06479168249fdfeea47bc105d05e88749Aurimas Liutikas AccessibilityRecordCompat.setMaxScrollY(event, nsvHost.getScrollRange()); 20021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 20041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell} 2005