NestedScrollView.java revision 4d2c7b7c4f194034c5f17c4bee7320d808aabe4c
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 201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.content.Context; 211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.content.res.TypedArray; 221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.graphics.Canvas; 231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.graphics.Rect; 241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Bundle; 251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Parcel; 261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.os.Parcelable; 271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.AccessibilityDelegateCompat; 281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.InputDeviceCompat; 291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.MotionEventCompat; 301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.NestedScrollingChild; 311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.NestedScrollingChildHelper; 321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.NestedScrollingParent; 331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.NestedScrollingParentHelper; 34c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Arakiimport android.support.v4.view.ScrollingView; 351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.VelocityTrackerCompat; 361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.ViewCompat; 371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.support.v4.view.accessibility.AccessibilityEventCompat; 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; 531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.widget.FrameLayout; 541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport android.widget.ScrollView; 551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellimport java.util.List; 571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell/** 591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * NestedScrollView is just like {@link android.widget.ScrollView}, but it supports acting 601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * as both a nested scrolling parent and child on both new and old versions of Android. 611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Nested scrolling is enabled by default. 621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powellpublic class NestedScrollView extends FrameLayout implements NestedScrollingParent, 64c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki NestedScrollingChild, ScrollingView { 651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static final int ANIMATED_SCROLL_GAP = 250; 661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static final float MAX_SCROLL_FACTOR = 0.5f; 681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final String TAG = "NestedScrollView"; 701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 71cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 72cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Interface definition for a callback to be invoked when the scroll 73cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * X or Y positions of a view change. 74cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 75cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * <p>This version of the interface works on all versions of Android, back to API v4.</p> 76cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 77cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see #setOnScrollChangeListener(OnScrollChangeListener) 78cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 79cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes public interface OnScrollChangeListener { 80cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 81cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Called when the scroll position of a view changes. 82cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 83cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param v The view whose scroll position has changed. 84cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param scrollX Current horizontal scroll origin. 85cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param scrollY Current vertical scroll origin. 86cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param oldScrollX Previous horizontal scroll origin. 87cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param oldScrollY Previous vertical scroll origin. 88cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 89cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes void onScrollChange(NestedScrollView v, int scrollX, int scrollY, 90cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes int oldScrollX, int oldScrollY); 91cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 92cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private long mLastScroll; 941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final Rect mTempRect = new Rect(); 961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private ScrollerCompat mScroller; 971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private EdgeEffectCompat mEdgeGlowTop; 981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private EdgeEffectCompat mEdgeGlowBottom; 991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Position of the last motion event. 1021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mLastMotionY; 1041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * True when the layout has changed but the traversal has not come through yet. 1071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Ideally the view hierarchy would keep track of this for us. 1081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsLayoutDirty = true; 1101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsLaidOut = false; 1111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * The child to give focus to in the event that a child has requested focus while the 1141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * layout is dirty. This prevents the scroll from being wrong if the child has not been 1151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * laid out before requesting focus. 1161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private View mChildToScrollTo = null; 1181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * True if the user is currently dragging this ScrollView around. This is 1211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * not the same as 'is being flinged', which can be checked by 1221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * mScroller.isFinished() (flinging begins when the user lifts his finger). 1231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mIsBeingDragged = false; 1251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Determines speed during touch scrolling 1281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private VelocityTracker mVelocityTracker; 1301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * When set to true, the scroll view measure its child to make it fill the currently 1331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * visible area. 1341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mFillViewport; 1361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Whether arrow scrolling is animated. 1391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean mSmoothScrollingEnabled = true; 1411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mTouchSlop; 1431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mMinimumVelocity; 1441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mMaximumVelocity; 1451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * ID of the active pointer. This is used to retain consistency during 1481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * drags/flings if multiple pointers are used. 1491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mActivePointerId = INVALID_POINTER; 1511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Used during scrolling to retrieve the new offset within the window. 1541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final int[] mScrollOffset = new int[2]; 1561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final int[] mScrollConsumed = new int[2]; 1571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int mNestedYOffset; 1581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 1601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Sentinel value for no current active pointer. 1611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Used by {@link #mActivePointerId}. 1621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 1631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final int INVALID_POINTER = -1; 1641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private SavedState mSavedState; 1661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final AccessibilityDelegate ACCESSIBILITY_DELEGATE = new AccessibilityDelegate(); 1681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static final int[] SCROLLVIEW_STYLEABLE = new int[] { 1701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell android.R.attr.fillViewport 1711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell }; 1721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final NestedScrollingParentHelper mParentHelper; 1741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private final NestedScrollingChildHelper mChildHelper; 1751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private float mVerticalScrollFactor; 1771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 178cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes private OnScrollChangeListener mOnScrollChangeListener; 179cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 1801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public NestedScrollView(Context context) { 1811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell this(context, null); 1821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 1831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public NestedScrollView(Context context, AttributeSet attrs) { 1851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell this(context, attrs, 0); 1861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 1871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public NestedScrollView(Context context, AttributeSet attrs, int defStyleAttr) { 1891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(context, attrs, defStyleAttr); 1901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initScrollView(); 1911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final TypedArray a = context.obtainStyledAttributes( 1931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell attrs, SCROLLVIEW_STYLEABLE, defStyleAttr, 0); 1941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setFillViewport(a.getBoolean(0, false)); 1961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell a.recycle(); 1981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mParentHelper = new NestedScrollingParentHelper(this); 2001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper = new NestedScrollingChildHelper(this); 2011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // ...because why else would you be using this widget? 2031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setNestedScrollingEnabled(true); 2041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.setAccessibilityDelegate(this, ACCESSIBILITY_DELEGATE); 2061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // NestedScrollingChild 2091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setNestedScrollingEnabled(boolean enabled) { 2121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper.setNestedScrollingEnabled(enabled); 2131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isNestedScrollingEnabled() { 2171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.isNestedScrollingEnabled(); 2181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean startNestedScroll(int axes) { 2221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.startNestedScroll(axes); 2231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void stopNestedScroll() { 2271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildHelper.stopNestedScroll(); 2281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean hasNestedScrollingParent() { 2321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.hasNestedScrollingParent(); 2331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, 2371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int dyUnconsumed, int[] offsetInWindow) { 2381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, 2391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetInWindow); 2401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) { 2441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow); 2451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) { 2491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed); 2501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchNestedPreFling(float velocityX, float velocityY) { 2541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mChildHelper.dispatchNestedPreFling(velocityX, velocityY); 2551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // NestedScrollingParent 2581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 2611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (nestedScrollAxes & ViewCompat.SCROLL_AXIS_VERTICAL) != 0; 2621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedScrollAccepted(View child, View target, int nestedScrollAxes) { 2661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mParentHelper.onNestedScrollAccepted(child, target, nestedScrollAxes); 2671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL); 2681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onStopNestedScroll(View target) { 272cb3b6124a87f9116ce92fcf17f59287445c41442Chris Banes mParentHelper.onStopNestedScroll(target); 2731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell stopNestedScroll(); 2741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedScroll(View target, int dxConsumed, int dyConsumed, int dxUnconsumed, 2781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int dyUnconsumed) { 2791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int oldScrollY = getScrollY(); 2801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, dyUnconsumed); 2811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int myConsumed = getScrollY() - oldScrollY; 2821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int myUnconsumed = dyUnconsumed - myConsumed; 2831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dispatchNestedScroll(0, myConsumed, 0, myUnconsumed, null); 2841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 288d370f75e50bf31d348d4e424ba8477ac77635f70Chris Banes dispatchNestedPreScroll(dx, dy, consumed, null); 2891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 2911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 2921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 2931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!consumed) { 2941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell flingWithNestedDispatch((int) velocityY); 2951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 2961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 2981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 2991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 302d370f75e50bf31d348d4e424ba8477ac77635f70Chris Banes return dispatchNestedPreFling(velocityX, velocityY); 3031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int getNestedScrollAxes() { 3071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mParentHelper.getNestedScrollAxes(); 3081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // ScrollView import 3111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean shouldDelayChildPressedState() { 3131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 3141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected float getTopFadingEdgeStrength() { 3181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 3191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0.0f; 3201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int length = getVerticalFadingEdgeLength(); 3231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 3241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollY < length) { 3251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollY / (float) length; 3261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 1.0f; 3291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected float getBottomFadingEdgeStrength() { 3331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 3341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0.0f; 3351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int length = getVerticalFadingEdgeLength(); 3381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottomEdge = getHeight() - getPaddingBottom(); 3391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int span = getChildAt(0).getBottom() - getScrollY() - bottomEdge; 3401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (span < length) { 3411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return span / (float) length; 3421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 1.0f; 3451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 3481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return The maximum amount this scroll view will scroll in response to 3491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * an arrow event. 3501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 3511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int getMaxScrollAmount() { 3521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (int) (MAX_SCROLL_FACTOR * getHeight()); 3531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initScrollView() { 356c5847d13e40f5d52459f5c0dab32dc08f1a9a683Chris Banes mScroller = ScrollerCompat.create(getContext(), null); 3571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setFocusable(true); 3581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 3591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setWillNotDraw(false); 3601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewConfiguration configuration = ViewConfiguration.get(getContext()); 3611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTouchSlop = configuration.getScaledTouchSlop(); 3621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 3631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 3641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child) { 3681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 3691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 3701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child); 3731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, int index) { 3771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 3781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 3791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, index); 3821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, ViewGroup.LayoutParams params) { 3861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 3871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 3881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, params); 3911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 3941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void addView(View child, int index, ViewGroup.LayoutParams params) { 3951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 3961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException("ScrollView can host only one direct child"); 3971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 3981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 3991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.addView(child, index, params); 4001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 403cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * Register a callback to be invoked when the scroll X or Y positions of 404cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * this view change. 405cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * <p>This version of the method works on all versions of Android, back to API v4.</p> 406cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * 407cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @param l The listener to notify when the scroll X or Y position changes. 408cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see android.view.View#getScrollX() 409cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes * @see android.view.View#getScrollY() 410cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes */ 411cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes public void setOnScrollChangeListener(OnScrollChangeListener l) { 412cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes mOnScrollChangeListener = l; 413cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 414cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 415cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes /** 4161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Returns true this ScrollView can be scrolled 4171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean canScroll() { 4191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 4201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (child != null) { 4211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeight = child.getHeight(); 4221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return getHeight() < childHeight + getPaddingTop() + getPaddingBottom(); 4231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 4251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 4281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Indicates whether this ScrollView's content is stretched to fill the viewport. 4291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 4301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return True if the content fills the viewport, false otherwise. 4311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 432929f27aab7ac7231f3734c988d5ee7201627d535Alan Viverette * @attr name android:fillViewport 4331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isFillViewport() { 4351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mFillViewport; 4361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 439236bf5bc5041e4bf356eac3855fd4fcf72cd6994Aurimas Liutikas * Set whether this ScrollView should stretch its content height to fill the viewport or not. 4401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 4411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param fillViewport True to stretch the content's height to the viewport's 4421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * boundaries, false otherwise. 4431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 444929f27aab7ac7231f3734c988d5ee7201627d535Alan Viverette * @attr name android:fillViewport 4451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setFillViewport(boolean fillViewport) { 4471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (fillViewport != mFillViewport) { 4481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mFillViewport = fillViewport; 4491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestLayout(); 4501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 4541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Whether arrow scrolling will animate its transition. 4551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean isSmoothScrollingEnabled() { 4571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mSmoothScrollingEnabled; 4581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 4611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Set whether arrow scrolling will animate its transition. 4621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 4631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 4641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 4651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSmoothScrollingEnabled = smoothScrollingEnabled; 4661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 469cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes protected void onScrollChanged(int l, int t, int oldl, int oldt) { 470cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes super.onScrollChanged(l, t, oldl, oldt); 471cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 472cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes if (mOnScrollChangeListener != null) { 473cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes mOnScrollChangeListener.onScrollChange(this, l, t, oldl, oldt); 474cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 475cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes } 476cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes 477cc82b3ee0c53b2f2da75b7fda5fe4b8f5af5dc1cChris Banes @Override 4781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 4791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onMeasure(widthMeasureSpec, heightMeasureSpec); 4801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mFillViewport) { 4821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 4831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 4861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (heightMode == MeasureSpec.UNSPECIFIED) { 4871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 4881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 4891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 4911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final View child = getChildAt(0); 4921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getMeasuredHeight(); 4931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (child.getMeasuredHeight() < height) { 4941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 4951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 4961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 4971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell getPaddingLeft() + getPaddingRight(), lp.width); 4981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell height -= getPaddingTop(); 4991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell height -= getPaddingBottom(); 5001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeightMeasureSpec = 5011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 5021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 5091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean dispatchKeyEvent(KeyEvent event) { 5101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Let the focused view and/or our descendants get the key first 5111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return super.dispatchKeyEvent(event) || executeKeyEvent(event); 5121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 5151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * You can call this function yourself to have the scroll view perform 5161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * scrolling from a key event, just as if the event had been dispatched to 5171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * it by the view hierarchy. 5181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 5191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param event The key event to execute. 5201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return Return true if the event was handled, else false. 5211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 5221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean executeKeyEvent(KeyEvent event) { 5231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.setEmpty(); 5241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!canScroll()) { 5261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 5271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 5281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused == this) currentFocused = null; 5291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View nextFocused = FocusFinder.getInstance().findNextFocus(this, 5301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell currentFocused, View.FOCUS_DOWN); 5311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return nextFocused != null 5321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && nextFocused != this 5331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && nextFocused.requestFocus(View.FOCUS_DOWN); 5341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 5361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean handled = false; 5391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (event.getAction() == KeyEvent.ACTION_DOWN) { 5401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (event.getKeyCode()) { 5411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_DPAD_UP: 5421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!event.isAltPressed()) { 5431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = arrowScroll(View.FOCUS_UP); 5441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 5451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = fullScroll(View.FOCUS_UP); 5461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 5481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_DPAD_DOWN: 5491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!event.isAltPressed()) { 5501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = arrowScroll(View.FOCUS_DOWN); 5511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 5521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = fullScroll(View.FOCUS_DOWN); 5531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 5551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case KeyEvent.KEYCODE_SPACE: 5561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 5571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 5581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return handled; 5621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean inChild(int x, int y) { 5651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 5661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 5671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final View child = getChildAt(0); 5681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return !(y < child.getTop() - scrollY 5691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || y >= child.getBottom() - scrollY 5701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || x < child.getLeft() 5711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell || x >= child.getRight()); 5721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 5741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initOrResetVelocityTracker() { 5771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker == null) { 5781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = VelocityTracker.obtain(); 5791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 5801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 5811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void initVelocityTrackerIfNotExists() { 5851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker == null) { 5861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = VelocityTracker.obtain(); 5871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void recycleVelocityTracker() { 5911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 5921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.recycle(); 5931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker = null; 5941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 5961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 5971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 5981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 5991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (disallowIntercept) { 6001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 6011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestDisallowInterceptTouchEvent(disallowIntercept); 6031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 6071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onInterceptTouchEvent(MotionEvent ev) { 6081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * This method JUST determines whether we want to intercept the motion. 6101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If we return true, onMotionEvent will be called and we do the actual 6111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * scrolling there. 6121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Shortcut the most recurring case: the user is in the dragging 6161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * state and he is moving his finger. We want to intercept this 6171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * motion. 6181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int action = ev.getAction(); 6201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 6211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 6221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (action & MotionEventCompat.ACTION_MASK) { 6251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_MOVE: { 6261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 6281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * whether the user has moved far enough from his original down touch. 6291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Locally do absolute value. mLastMotionY is set to the y value 6331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * of the down event. 6341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int activePointerId = mActivePointerId; 6361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (activePointerId == INVALID_POINTER) { 6371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // If we don't have a valid id, the touch down wasn't on content. 6381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6411b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int pointerIndex = ev.findPointerIndex(activePointerId); 6421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pointerIndex == -1) { 6431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Log.e(TAG, "Invalid pointerId=" + activePointerId 6441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + " in onInterceptTouchEvent"); 6451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6481b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int y = (int) ev.getY(pointerIndex); 6491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int yDiff = Math.abs(y - mLastMotionY); 6501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (yDiff > mTouchSlop 6511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0) { 6521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = true; 6531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y; 6541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initVelocityTrackerIfNotExists(); 6551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(ev); 6561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset = 0; 6571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 6581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 6591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 6601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_DOWN: { 6661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int y = (int) ev.getY(); 6671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 6681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 6691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 6701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 6741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Remember location of down touch. 6751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * ACTION_DOWN always refers to pointer index 0. 6761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 6771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y; 6781b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(0); 6791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initOrResetVelocityTracker(); 6811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(ev); 6821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 683661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * If being flinged and user touches the screen, initiate drag; 684661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * otherwise don't. mScroller.isFinished should be false when 685661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * being flinged. We need to call computeScrollOffset() first so that 686661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes * isFinished() is correct. 6871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 688661d25de05417a357540283ee0cd93b1326ac3a4Chris Banes mScroller.computeScrollOffset(); 6891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = !mScroller.isFinished(); 6901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL); 6911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 6921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 6931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 6941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_CANCEL: 6951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_UP: 6961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Release the drag */ 6971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 6981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mActivePointerId = INVALID_POINTER; 6991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 70000db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, getScrollRange())) { 70100db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes ViewCompat.postInvalidateOnAnimation(this); 70200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 7031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell stopNestedScroll(); 7041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEventCompat.ACTION_POINTER_UP: 7061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onSecondaryPointerUp(ev); 7071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * The only time we want to intercept motion events is if we are in the 7121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * drag mode. 7131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mIsBeingDragged; 7151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 7181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onTouchEvent(MotionEvent ev) { 7191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell initVelocityTrackerIfNotExists(); 7201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell MotionEvent vtev = MotionEvent.obtain(ev); 7221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int actionMasked = MotionEventCompat.getActionMasked(ev); 7241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (actionMasked == MotionEvent.ACTION_DOWN) { 7261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset = 0; 7271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mNestedYOffset); 7291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (actionMasked) { 7311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_DOWN: { 7321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 7331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 7341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 7361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 7371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 7381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 7391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 7431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If being flinged and user touches, stop the fling. isFinished 7441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * will be false if being flinged. 7451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 7461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mScroller.isFinished()) { 7471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.abortAnimation(); 7481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Remember where the motion event started 7511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = (int) ev.getY(); 7521b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(0); 7531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL); 7541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_MOVE: 7571b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 7581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (activePointerIndex == -1) { 7591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 7601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 7611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7631b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int y = (int) ev.getY(activePointerIndex); 7641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int deltaY = mLastMotionY - y; 7651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) { 7661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY -= mScrollConsumed[1]; 7671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 7681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset += mScrollOffset[1]; 7691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { 7711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent parent = getParent(); 7721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (parent != null) { 7731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell parent.requestDisallowInterceptTouchEvent(true); 7741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = true; 7761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (deltaY > 0) { 7771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY -= mTouchSlop; 7781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 7791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell deltaY += mTouchSlop; 7801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mIsBeingDragged) { 7831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Scroll to follow the motion event 7841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY = y - mScrollOffset[1]; 7851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int oldY = getScrollY(); 7871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 788e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final int overscrollMode = getOverScrollMode(); 789e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas boolean canOverscroll = overscrollMode == View.OVER_SCROLL_ALWAYS 790e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overscrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 7911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 7921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Calling overScrollByCompat will call onOverScrolled, which 7931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // calls onScrollChanged if applicable. 7941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (overScrollByCompat(0, deltaY, 0, getScrollY(), 0, range, 0, 7951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 0, true) && !hasNestedScrollingParent()) { 7961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Break our velocity if we hit a scroll barrier. 7971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 7981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 7991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrolledDeltaY = getScrollY() - oldY; 8011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int unconsumedY = deltaY - scrolledDeltaY; 8021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, mScrollOffset)) { 8031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastMotionY -= mScrollOffset[1]; 8041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.offsetLocation(0, mScrollOffset[1]); 8051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mNestedYOffset += mScrollOffset[1]; 8061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (canOverscroll) { 8071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ensureGlows(); 8081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int pulledToY = oldY + deltaY; 8091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pulledToY < 0) { 8101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onPull((float) deltaY / getHeight(), 8111b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov ev.getX(activePointerIndex) / getWidth()); 8121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowBottom.isFinished()) { 8131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onRelease(); 8141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (pulledToY > range) { 8161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onPull((float) deltaY / getHeight(), 8171b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov 1.f - ev.getX(activePointerIndex) 8181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell / getWidth()); 8191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowTop.isFinished()) { 8201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onRelease(); 8211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null 8241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 8251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 8261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_UP: 8311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mIsBeingDragged) { 8321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final VelocityTracker velocityTracker = mVelocityTracker; 8331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 8341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int initialVelocity = (int) VelocityTrackerCompat.getYVelocity(velocityTracker, 8351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mActivePointerId); 8361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 8381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell flingWithNestedDispatch(-initialVelocity); 83900db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } else if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, 84000db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes getScrollRange())) { 84100db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes ViewCompat.postInvalidateOnAnimation(this); 8421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 844ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes mActivePointerId = INVALID_POINTER; 845ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes endDrag(); 8461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEvent.ACTION_CANCEL: 8481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mIsBeingDragged && getChildCount() > 0) { 84900db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes if (mScroller.springBack(getScrollX(), getScrollY(), 0, 0, 0, 85000db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes getScrollRange())) { 85100db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes ViewCompat.postInvalidateOnAnimation(this); 85200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 8531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 854ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes mActivePointerId = INVALID_POINTER; 855ba3bd1923ffd1ef5597deb0a9df8c1444fbf4433Chris Banes endDrag(); 8561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEventCompat.ACTION_POINTER_DOWN: { 8581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int index = MotionEventCompat.getActionIndex(ev); 8591b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(index); 8601b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(index); 8611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEventCompat.ACTION_POINTER_UP: 8641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onSecondaryPointerUp(ev); 8651b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); 8661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell break; 8671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 8701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.addMovement(vtev); 8711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell vtev.recycle(); 8731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 8741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void onSecondaryPointerUp(MotionEvent ev) { 8774d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final int pointerIndex = (ev.getAction() & MotionEventCompat.ACTION_POINTER_INDEX_MASK) 8784d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas >> MotionEventCompat.ACTION_POINTER_INDEX_SHIFT; 8791b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov final int pointerId = ev.getPointerId(pointerIndex); 8801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (pointerId == mActivePointerId) { 8811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // This was our active pointer going up. Choose a new 8821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // active pointer and adjust accordingly. 8831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // TODO: Make this decision more intelligent. 8841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 8851b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mLastMotionY = (int) ev.getY(newPointerIndex); 8861b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov mActivePointerId = ev.getPointerId(newPointerIndex); 8871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVelocityTracker != null) { 8881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVelocityTracker.clear(); 8891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 8921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 8931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean onGenericMotionEvent(MotionEvent event) { 8941b3e9466b4c4d72f28bb4448672ef8bab19b6f3eKirill Grouchnikov if ((event.getSource() & InputDeviceCompat.SOURCE_CLASS_POINTER) != 0) { 8951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (event.getAction()) { 8961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case MotionEventCompat.ACTION_SCROLL: { 8971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsBeingDragged) { 8981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final float vscroll = MotionEventCompat.getAxisValue(event, 8991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell MotionEventCompat.AXIS_VSCROLL); 9001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (vscroll != 0) { 9011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int delta = (int) (vscroll * getVerticalScrollFactorCompat()); 9021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 9031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int oldScrollY = getScrollY(); 9041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollY = oldScrollY - delta; 9051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY < 0) { 9061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = 0; 9071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollY > range) { 9081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = range; 9091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY != oldScrollY) { 9111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(getScrollX(), newScrollY); 9121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 9131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 9201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private float getVerticalScrollFactorCompat() { 9231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mVerticalScrollFactor == 0) { 9241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell TypedValue outValue = new TypedValue(); 9251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final Context context = getContext(); 9261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!context.getTheme().resolveAttribute( 9271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell android.R.attr.listPreferredItemHeight, outValue, true)) { 9281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell throw new IllegalStateException( 9291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell "Expected theme to define listPreferredItemHeight."); 9301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mVerticalScrollFactor = outValue.getDimension( 9321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell context.getResources().getDisplayMetrics()); 9331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return mVerticalScrollFactor; 9351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 93715375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 9381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 9391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedX, boolean clampedY) { 9401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(scrollX, scrollY); 9411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean overScrollByCompat(int deltaX, int deltaY, 9441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollX, int scrollY, 9451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRangeX, int scrollRangeY, 9461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int maxOverScrollX, int maxOverScrollY, 9471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean isTouchEvent) { 948e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final int overScrollMode = getOverScrollMode(); 9491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean canScrollHorizontal = 9501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 9511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean canScrollVertical = 9521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell computeVerticalScrollRange() > computeVerticalScrollExtent(); 953e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final boolean overScrollHorizontal = overScrollMode == View.OVER_SCROLL_ALWAYS 954e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 955e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final boolean overScrollVertical = overScrollMode == View.OVER_SCROLL_ALWAYS 956e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overScrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 9571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollX = scrollX + deltaX; 9591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!overScrollHorizontal) { 9601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell maxOverScrollX = 0; 9611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int newScrollY = scrollY + deltaY; 9641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!overScrollVertical) { 9651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell maxOverScrollY = 0; 9661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Clamp values if at the limits and record 9691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int left = -maxOverScrollX; 9701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int right = maxOverScrollX + scrollRangeX; 9711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int top = -maxOverScrollY; 9721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottom = maxOverScrollY + scrollRangeY; 9731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedX = false; 9751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollX > right) { 9761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollX = right; 9771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedX = true; 9781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollX < left) { 9791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollX = left; 9801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedX = true; 9811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean clampedY = false; 9841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newScrollY > bottom) { 9851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = bottom; 9861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedY = true; 9871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (newScrollY < top) { 9881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newScrollY = top; 9891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell clampedY = true; 9901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 9911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 99200db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes if (clampedY) { 99300db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes mScroller.springBack(newScrollX, newScrollY, 0, 0, 0, getScrollRange()); 99400db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes } 99500db92e217c3bc08acd09143cac8e3d3b0d0e813Chris Banes 9961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 9971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 9981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return clampedX || clampedY; 9991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private int getScrollRange() { 10021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRange = 0; 10031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 10041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 10051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange = Math.max(0, 10061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getHeight() - (getHeight() - getPaddingBottom() - getPaddingTop())); 10071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollRange; 10091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 10121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p> 10131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Finds the next focusable component that fits in the specified bounds. 10141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * </p> 10151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 10161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param topFocus look for a candidate is the one at the top of the bounds 10171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * if topFocus is true, or at the bottom of the bounds if topFocus is 10181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * false 10191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param top the top offset of the bounds in which a focusable must be 10201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * found 10211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param bottom the bottom offset of the bounds in which a focusable must 10221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * be found 10231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return the next focusable component in the bounds or null if none can 10241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * be found 10251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 10271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell List<View> focusables = getFocusables(View.FOCUS_FORWARD); 10291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View focusCandidate = null; 10301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 10321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * A fully contained focusable is one where its top is below the bound's 10331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * top, and its bottom is above the bound's bottom. A partially 10341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * contained focusable is one where some part of it is within the 10351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * bounds, but it also has some part that is not within bounds. A fully contained 10361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focusable is preferred to a partially contained focusable. 10371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean foundFullyContainedFocusable = false; 10391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = focusables.size(); 10411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell for (int i = 0; i < count; i++) { 10421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = focusables.get(i); 10431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int viewTop = view.getTop(); 10441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int viewBottom = view.getBottom(); 10451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (top < viewBottom && viewTop < bottom) { 10471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 10481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * the focusable is in the target area, it is a candidate for 10491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focusing 10501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10524d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final boolean viewIsFullyContained = (top < viewTop) && (viewBottom < bottom); 10531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (focusCandidate == null) { 10551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* No candidate, take this one */ 10561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 10571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell foundFullyContainedFocusable = viewIsFullyContained; 10581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 10591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean viewIsCloserToBoundary = 10604d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas (topFocus && viewTop < focusCandidate.getTop()) 10614d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas || (!topFocus && viewBottom > focusCandidate.getBottom()); 10621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (foundFullyContainedFocusable) { 10641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (viewIsFullyContained && viewIsCloserToBoundary) { 10651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 10661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * We're dealing with only fully contained views, so 10671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * it has to be closer to the boundary to beat our 10681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * candidate 10691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 10711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 10731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (viewIsFullyContained) { 10741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Any fully contained view beats a partially contained view */ 10751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 10761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell foundFullyContainedFocusable = true; 10771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (viewIsCloserToBoundary) { 10781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* 10791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Partially contained view beats another partially 10801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * contained view if it's closer 10811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 10821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell focusCandidate = view; 10831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return focusCandidate; 10901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 10911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 10921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 10931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Handles scrolling in response to a "page up/down" shortcut press. This 10941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * method will scroll the view by one page up or down and give the focus 10951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to the topmost/bottommost component in the new visible area. If no 10961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * component is a good candidate for focus, this scrollview reclaims the 10971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focus.</p> 10981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 10991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 11001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go one page up or 11011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@link android.view.View#FOCUS_DOWN} to go one page down 11021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 11031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean pageScroll(int direction) { 11051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean down = direction == View.FOCUS_DOWN; 11061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 11071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (down) { 11091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = getScrollY() + height; 11101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = getChildCount(); 11111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count > 0) { 11121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = getChildAt(count - 1); 11131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mTempRect.top + height > view.getBottom()) { 11141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = view.getBottom() - height; 11151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 11181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = getScrollY() - height; 11191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mTempRect.top < 0) { 11201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = 0; 11211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = mTempRect.top + height; 11241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 11261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 11291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Handles scrolling in response to a "home/end" shortcut press. This 11301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * method will scroll the view to the top or bottom and give the focus 11311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to the topmost/bottommost component in the new visible area. If no 11321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * component is a good candidate for focus, this scrollview reclaims the 11331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * focus.</p> 11341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 11351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 11361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go the top of the view or 11371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@link android.view.View#FOCUS_DOWN} to go the bottom 11381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 11391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean fullScroll(int direction) { 11411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean down = direction == View.FOCUS_DOWN; 11421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 11431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = 0; 11451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = height; 11461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (down) { 11481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int count = getChildCount(); 11491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count > 0) { 11501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View view = getChildAt(count - 1); 11511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.bottom = view.getBottom() + getPaddingBottom(); 11521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mTempRect.top = mTempRect.bottom - height; 11531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 11571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 11601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>Scrolls the view to make the area defined by <code>top</code> and 11611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <code>bottom</code> visible. This method attempts to give the focus 11621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to a component visible in this area. If no component can be focused in 11631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * the new visible area, the focus is reclaimed by this ScrollView.</p> 11641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 11651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 11661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 11671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param top the top offset of the new area to be made visible 11681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param bottom the bottom offset of the new area to be made visible 11691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if the key event is consumed by this method, false otherwise 11701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 11711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean scrollAndFocus(int direction, int top, int bottom) { 11721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean handled = true; 11731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 11751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int containerTop = getScrollY(); 11761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int containerBottom = containerTop + height; 11771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean up = direction == View.FOCUS_UP; 11781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View newFocused = findFocusableViewInBounds(up, top, bottom); 11801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newFocused == null) { 11811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell newFocused = this; 11821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (top >= containerTop && bottom <= containerBottom) { 11851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell handled = false; 11861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 11871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int delta = up ? (top - containerTop) : (bottom - containerBottom); 11881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(delta); 11891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (newFocused != findFocus()) newFocused.requestFocus(direction); 11921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return handled; 11941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 11951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 11961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 11971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Handle scrolling in response to an up or down arrow click. 11981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 11991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param direction The direction corresponding to the arrow key that was 12001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * pressed 12011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return True if we consumed the event, false otherwise 12021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean arrowScroll(int direction) { 12041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 12061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused == this) currentFocused = null; 12071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 12091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int maxJump = getMaxScrollAmount(); 12111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 12131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nextFocused.getDrawingRect(mTempRect); 12141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(nextFocused, mTempRect); 12151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(scrollDelta); 12171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nextFocused.requestFocus(direction); 12181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 12191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // no new focus 12201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = maxJump; 12211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 12231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollDelta = getScrollY(); 12241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (direction == View.FOCUS_DOWN) { 12251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 12261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int daBottom = getChildAt(0).getBottom(); 12271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenBottom = getScrollY() + getHeight() - getPaddingBottom(); 12281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (daBottom - screenBottom < maxJump) { 12291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollDelta = daBottom - screenBottom; 12301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollDelta == 0) { 12341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 12351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 12371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (currentFocused != null && currentFocused.isFocused() 12401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && isOffScreen(currentFocused)) { 12411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // previously focused item still has focus and is off screen, give 12421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // it up (take it back to ourselves) 12431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 12441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // sure to 12451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // get it) 12461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int descendantFocusability = getDescendantFocusability(); // save 12471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 12481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestFocus(); 12491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell setDescendantFocusability(descendantFocusability); // restore 12501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 12521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return whether the descendant of this scroll view is scrolled off 12561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * screen. 12571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean isOffScreen(View descendant) { 12591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 12601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return whether the descendant of this scroll view is within delta 12641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * pixels of being on the screen. 12651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 12671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell descendant.getDrawingRect(mTempRect); 12681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(descendant, mTempRect); 12691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (mTempRect.bottom + delta) >= getScrollY() 12711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell && (mTempRect.top - delta) <= (getScrollY() + height); 12721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Smooth scroll by a Y delta 12761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 12771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param delta the number of pixels to scroll by on the Y axis 12781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void doScrollY(int delta) { 12801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (delta != 0) { 12811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mSmoothScrollingEnabled) { 12821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(0, delta); 12831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 12841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, delta); 12851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 12881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 12891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 12901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 12911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 12921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param dx the number of pixels to scroll by on the X axis 12931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param dy the number of pixels to scroll by on the Y axis 12941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 12951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public final void smoothScrollBy(int dx, int dy) { 12961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) { 12971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Nothing to do. 12981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 12991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 13011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (duration > ANIMATED_SCROLL_GAP) { 13021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int height = getHeight() - getPaddingBottom() - getPaddingTop(); 13031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int bottom = getChildAt(0).getHeight(); 13041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int maxY = Math.max(0, bottom - height); 13051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 13061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 13071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.startScroll(getScrollX(), scrollY, 0, dy); 13091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 13101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 13111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mScroller.isFinished()) { 13121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.abortAnimation(); 13131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(dx, dy); 13151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 13171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 13211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 13221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param x the position where to scroll on the X axis 13231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param y the position where to scroll on the Y axis 13241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public final void smoothScrollTo(int x, int y) { 13261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(x - getScrollX(), y - getScrollY()); 13271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 13301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>The scroll range of a scroll view is the overall height of all of its 13311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * children.</p> 1332c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki * @hide 13331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 13341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 1335c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollRange() { 13361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int count = getChildCount(); 13371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int contentHeight = getHeight() - getPaddingBottom() - getPaddingTop(); 13381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (count == 0) { 13391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return contentHeight; 13401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollRange = getChildAt(0).getBottom(); 13431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 13441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 13451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollY < 0) { 13461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange -= scrollY; 13471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (scrollY > overscrollBottom) { 13481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollRange += scrollY - overscrollBottom; 13491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollRange; 13521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1354c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 13551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 1356c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollOffset() { 13571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return Math.max(0, super.computeVerticalScrollOffset()); 13581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 1360c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 1361c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1362c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeVerticalScrollExtent() { 1363c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeVerticalScrollExtent(); 1364c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1365c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1366c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 1367c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1368c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollRange() { 1369c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollRange(); 1370c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1371c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1372c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 1373c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1374c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollOffset() { 1375c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollOffset(); 1376c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1377c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 1378c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki /** @hide */ 1379c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki @Override 1380c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki public int computeHorizontalScrollExtent() { 1381c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki return super.computeHorizontalScrollExtent(); 1382c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki } 1383c608a7d5a7fddcf06af43d58d7c62dedd38cffc9Yuichi Araki 13841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 13854d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas protected void measureChild(View child, int parentWidthMeasureSpec, 13864d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas int parentHeightMeasureSpec) { 13871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewGroup.LayoutParams lp = child.getLayoutParams(); 13881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childWidthMeasureSpec; 13901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int childHeightMeasureSpec; 13911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, getPaddingLeft() 13931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + getPaddingRight(), lp.width); 13941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 13961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 13971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 13981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 13991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 14011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 14021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int parentHeightMeasureSpec, int heightUsed) { 14031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 14041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 14061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell getPaddingLeft() + getPaddingRight() + lp.leftMargin + lp.rightMargin 14071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + widthUsed, lp.width); 14081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 14091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 14101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 14121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 14151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void computeScroll() { 14161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mScroller.computeScrollOffset()) { 14171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int oldX = getScrollX(); 14181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int oldY = getScrollY(); 14191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int x = mScroller.getCurrX(); 14201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int y = mScroller.getCurrY(); 14211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (oldX != x || oldY != y) { 14231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int range = getScrollRange(); 1424e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final int overscrollMode = getOverScrollMode(); 1425e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas final boolean canOverscroll = overscrollMode == View.OVER_SCROLL_ALWAYS 1426e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas || (overscrollMode == View.OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 14271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell overScrollByCompat(x - oldX, y - oldY, oldX, oldY, 0, range, 14291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 0, 0, false); 14301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (canOverscroll) { 14321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ensureGlows(); 14331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (y <= 0 && oldY > 0) { 14341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 14351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (y >= range && oldY < range) { 14361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 14371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 14441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Scrolls the view to the given child. 14451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 14461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param child the View to scroll to 14471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 14481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void scrollToChild(View child) { 14491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getDrawingRect(mTempRect); 14501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* Offset from child's local coordinates to ScrollView coordinates */ 14521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(child, mTempRect); 14531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 14551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollDelta != 0) { 14571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, scrollDelta); 14581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 14621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * If rect is off screen, scroll just enough to get it (or at least the 14631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * first screen size chunk of it) on screen. 14641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 14651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param rect The rectangle. 14661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param immediate True to scroll immediately without animation 14671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return true if scrolling was performed 14681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 14691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private boolean scrollToChildRect(Rect rect, boolean immediate) { 14701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 14711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean scroll = delta != 0; 14721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scroll) { 14731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (immediate) { 14741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollBy(0, delta); 14751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 14761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell smoothScrollBy(0, delta); 14771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scroll; 14801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 14811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 14831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Compute the amount to scroll in the Y direction in order to get 14841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * a rectangle completely on the screen (or, if taller than the screen, 14851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * at least the first screen size chunk of it). 14861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 14871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param rect The rect. 14881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @return The scroll delta. 14891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 14901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 14911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() == 0) return 0; 14921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight(); 14941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenTop = getScrollY(); 14951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int screenBottom = screenTop + height; 14961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int fadingEdge = getVerticalFadingEdgeLength(); 14981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 14991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // leave room for top fading edge as long as rect isn't at very top 15001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.top > 0) { 15011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell screenTop += fadingEdge; 15021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // leave room for bottom fading edge as long as rect isn't at very bottom 15051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.bottom < getChildAt(0).getHeight()) { 15061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell screenBottom -= fadingEdge; 15071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollYDelta = 0; 15101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.bottom > screenBottom && rect.top > screenTop) { 15121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // need to move down to get it in view: move down just enough so 15131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // that the entire rectangle is in view (or at least the first 15141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen size chunk). 15151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.height() > height) { 15171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // just enough to get screen size chunk on 15181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta += (rect.top - screenTop); 15191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 15201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // get entire rect at bottom of screen 15211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta += (rect.bottom - screenBottom); 15221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // make sure we aren't scrolling beyond the end of our content 15251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int bottom = getChildAt(0).getBottom(); 15261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int distanceToBottom = bottom - screenBottom; 15271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 15281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (rect.top < screenTop && rect.bottom < screenBottom) { 15301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // need to move up to get it in view: move up just enough so that 15311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // entire rectangle is in view (or at least the first screen 15321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // size chunk of it). 15331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (rect.height() > height) { 15351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen size chunk 15361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta -= (screenBottom - rect.bottom); 15371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 15381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // entire rect at top 15391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta -= (screenTop - rect.top); 15401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // make sure we aren't scrolling any further than the top our content 15431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 15441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollYDelta; 15461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 15491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestChildFocus(View child, View focused) { 15501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsLayoutDirty) { 15511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollToChild(focused); 15521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 15531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // The child may not be laid out yet, we can't compute the scroll yet 15541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildToScrollTo = focused; 15551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestChildFocus(child, focused); 15571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 15611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * When looking for focus in children of a scroll view, need to be a little 15621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * more careful not to give focus to something that is scrolled off screen. 15631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 15641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * This is more expensive than the default {@link android.view.ViewGroup} 15651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * implementation, otherwise this behavior might have been made the default. 15661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 15671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 15681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected boolean onRequestFocusInDescendants(int direction, 15691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Rect previouslyFocusedRect) { 15701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // convert from forward / backward notation to up / down / left / right 15721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // (ugh). 15731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (direction == View.FOCUS_FORWARD) { 15741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell direction = View.FOCUS_DOWN; 15751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (direction == View.FOCUS_BACKWARD) { 15761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell direction = View.FOCUS_UP; 15771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15794d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final View nextFocus = previouslyFocusedRect == null 15804d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas ? FocusFinder.getInstance().findNextFocus(this, null, direction) 15814d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas : FocusFinder.getInstance().findNextFocusFromRect( 15824d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas this, previouslyFocusedRect, direction); 15831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nextFocus == null) { 15851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 15861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isOffScreen(nextFocus)) { 15891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 15901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return nextFocus.requestFocus(direction, previouslyFocusedRect); 15931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 15941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 15951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 15961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 15971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell boolean immediate) { 15981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // offset into coordinate space of this scroll view 15991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell rectangle.offset(child.getLeft() - child.getScrollX(), 16001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell child.getTop() - child.getScrollY()); 16011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return scrollToChildRect(rectangle, immediate); 16031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void requestLayout() { 16071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLayoutDirty = true; 16081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.requestLayout(); 16091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onLayout(boolean changed, int l, int t, int r, int b) { 16131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onLayout(changed, l, t, r, b); 16141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLayoutDirty = false; 16151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Give a child focus if it needs it 16161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 16171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollToChild(mChildToScrollTo); 16181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mChildToScrollTo = null; 16201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mIsLaidOut) { 16221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mSavedState != null) { 16231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), mSavedState.scrollPosition); 16241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSavedState = null; 16251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } // mScrollY default value is "0" 16261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; 16281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollRange = Math.max(0, 16291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell childHeight - (b - t - getPaddingBottom() - getPaddingTop())); 16301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Don't forget to clamp 16321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getScrollY() > scrollRange) { 16331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), scrollRange); 16341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else if (getScrollY() < 0) { 16351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), 0); 16361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // Calling this with the present values causes it to re-claim them 16401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollTo(getScrollX(), getScrollY()); 16411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLaidOut = true; 16421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onAttachedToWindow() { 1646d344e81ad956ec445038f5ba2ca2ebd1831b1f8aAlan Viverette super.onAttachedToWindow(); 1647d344e81ad956ec445038f5ba2ca2ebd1831b1f8aAlan Viverette 16481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsLaidOut = false; 16491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 16521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onSizeChanged(int w, int h, int oldw, int oldh) { 16531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onSizeChanged(w, h, oldw, oldh); 16541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View currentFocused = findFocus(); 16564d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas if (null == currentFocused || this == currentFocused) { 16571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return; 16584d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas } 16591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // If the currently-focused view was visible on the screen when the 16611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // screen was at the old height, then scroll the screen to make that 16621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // view visible with the new screen height. 16631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 16641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell currentFocused.getDrawingRect(mTempRect); 16651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell offsetDescendantRectToMyCoords(currentFocused, mTempRect); 16661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 16671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell doScrollY(scrollDelta); 16681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 16721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Return true if child is a descendant of parent, (or equal to the parent). 16731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 16741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static boolean isViewDescendantOf(View child, View parent) { 16751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (child == parent) { 16761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 16771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final ViewParent theParent = child.getParent(); 16801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 16811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 16821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 16841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * Fling the scroll view 16851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 16861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * @param velocityY The initial velocity in the Y direction. Positive 16871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * numbers mean that the finger/cursor is moving down the screen, 16881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * which means we want to scroll towards the top. 16891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 16901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void fling(int velocityY) { 16911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 16921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int height = getHeight() - getPaddingBottom() - getPaddingTop(); 16931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell int bottom = getChildAt(0).getHeight(); 16941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mScroller.fling(getScrollX(), getScrollY(), 0, velocityY, 0, 0, 0, 16964d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas Math.max(0, bottom - height), 0, height / 2); 16971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 16981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 16991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void flingWithNestedDispatch(int velocityY) { 17031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 17044d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas final boolean canFling = (scrollY > 0 || velocityY > 0) 17054d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas && (scrollY < getScrollRange() || velocityY < 0); 17061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!dispatchNestedPreFling(0, velocityY)) { 17071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dispatchNestedFling(0, velocityY, canFling); 17081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (canFling) { 17091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell fling(velocityY); 17101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void endDrag() { 17151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mIsBeingDragged = false; 17161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell recycleVelocityTracker(); 1718d4c72f08279df548fbc4d556fe1a8b3500fafdbcChris Banes stopNestedScroll(); 17191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null) { 17211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.onRelease(); 17221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.onRelease(); 17231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /** 17271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * {@inheritDoc} 17281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 17291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * <p>This version also clamps the scrolling to the bounds of our child. 17301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 17311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void scrollTo(int x, int y) { 17331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell // we rely on the fact the View.scrollBy calls scrollTo. 17341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (getChildCount() > 0) { 17351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell View child = getChildAt(0); 17361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth()); 17371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight()); 17381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (x != getScrollX() || y != getScrollY()) { 17391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.scrollTo(x, y); 17401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private void ensureGlows() { 1745e12dfa03641ad9cf0ddf272675bbe7d1198adbfdAurimas Liutikas if (getOverScrollMode() != View.OVER_SCROLL_NEVER) { 17461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop == null) { 17471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Context context = getContext(); 17481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop = new EdgeEffectCompat(context); 17491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom = new EdgeEffectCompat(context); 17501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } else { 17521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop = null; 17531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom = null; 17541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 17581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void draw(Canvas canvas) { 17591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.draw(canvas); 17601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop != null) { 17611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollY = getScrollY(); 17621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowTop.isFinished()) { 17631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int restoreCount = canvas.save(); 17641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int width = getWidth() - getPaddingLeft() - getPaddingRight(); 17651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17661fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.translate(getPaddingLeft(), Math.min(0, scrollY)); 17671fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowTop.setSize(width, getHeight()); 17681fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowTop.draw(canvas)) { 17691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 17701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.restoreToCount(restoreCount); 17721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17731fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!mEdgeGlowBottom.isFinished()) { 17741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int restoreCount = canvas.save(); 17751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int width = getWidth() - getPaddingLeft() - getPaddingRight(); 17761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int height = getHeight(); 17771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.translate(-width + getPaddingLeft(), 17791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Math.max(getScrollRange(), scrollY) + height); 17801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.rotate(180, width, 0); 17811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mEdgeGlowBottom.setSize(width, height); 17821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 17831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ViewCompat.postInvalidateOnAnimation(this); 17841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell canvas.restoreToCount(restoreCount); 17861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 17891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 17901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell private static int clamp(int n, int my, int child) { 17911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (my >= child || n < 0) { 17921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* my >= child is this case: 17931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 17941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 17951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * or 17961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 17971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 17981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * or 17991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |--------------- me ---------------| 18001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 18011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * 18021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * n < 0 is this case: 18031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ me ------| 18041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-------- child --------| 18051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-- mScrollX --| 18061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 18071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return 0; 18081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18094d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas if ((my + n) > child) { 18101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell /* this case: 18111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ me ------| 18121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |------ child ------| 18131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell * |-- mScrollX --| 18141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell */ 18154d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas return child - my; 18161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return n; 18181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected void onRestoreInstanceState(Parcelable state) { 1822bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas if (!(state instanceof SavedState)) { 1823bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas super.onRestoreInstanceState(state); 1824bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas return; 1825bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas } 1826bb58a82daf11bf3c056d1cd5887aa26435d37b69Aurimas Liutikas 18271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState ss = (SavedState) state; 18281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onRestoreInstanceState(ss.getSuperState()); 18291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell mSavedState = ss; 18301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell requestLayout(); 18311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell protected Parcelable onSaveInstanceState() { 18351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell Parcelable superState = super.onSaveInstanceState(); 18361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState ss = new SavedState(superState); 18371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell ss.scrollPosition = getScrollY(); 18381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return ss; 18391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static class SavedState extends BaseSavedState { 18421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public int scrollPosition; 18431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell SavedState(Parcelable superState) { 18451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(superState); 18461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18484d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas SavedState(Parcel source) { 18491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super(source); 18501fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell scrollPosition = source.readInt(); 18511fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18521fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18531fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18541fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void writeToParcel(Parcel dest, int flags) { 18551fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.writeToParcel(dest, flags); 18561fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell dest.writeInt(scrollPosition); 18571fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18581fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18591fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18601fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public String toString() { 18611fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return "HorizontalScrollView.SavedState{" 18621fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + Integer.toHexString(System.identityHashCode(this)) 18631fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell + " scrollPosition=" + scrollPosition + "}"; 18641fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18651fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18664d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas public static final Parcelable.Creator<SavedState> CREATOR = 18674d2c7b7c4f194034c5f17c4bee7320d808aabe4cAurimas Liutikas new Parcelable.Creator<SavedState>() { 186815375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 18691fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public SavedState createFromParcel(Parcel in) { 18701fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return new SavedState(in); 18711fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18721fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 187315375aa6fd54b036f97f99229aefab2822c8a1c9Aurimas Liutikas @Override 18741fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public SavedState[] newArray(int size) { 18751fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return new SavedState[size]; 18761fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18771fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell }; 18781fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18791fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 18801fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell static class AccessibilityDelegate extends AccessibilityDelegateCompat { 18811fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 18821fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public boolean performAccessibilityAction(View host, int action, Bundle arguments) { 18831fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (super.performAccessibilityAction(host, action, arguments)) { 18841fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 18851fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18861fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 18871fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (!nsvHost.isEnabled()) { 18881fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 18891fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 18901fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell switch (action) { 18911fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD: { 18921fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() 18931fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell - nsvHost.getPaddingTop(); 18941fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int targetScrollY = Math.min(nsvHost.getScrollY() + viewportHeight, 18951fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.getScrollRange()); 18961fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (targetScrollY != nsvHost.getScrollY()) { 18971fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.smoothScrollTo(0, targetScrollY); 18981fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 18991fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19001fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19011fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 19021fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD: { 19031fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int viewportHeight = nsvHost.getHeight() - nsvHost.getPaddingBottom() 19041fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell - nsvHost.getPaddingTop(); 19051fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int targetScrollY = Math.max(nsvHost.getScrollY() - viewportHeight, 0); 19061fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (targetScrollY != nsvHost.getScrollY()) { 19071fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell nsvHost.smoothScrollTo(0, targetScrollY); 19081fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return true; 19091fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19101fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19111fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 19121fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19131fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell return false; 19141fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19151fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19161fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19171fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfoCompat info) { 19181fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onInitializeAccessibilityNodeInfo(host, info); 19191fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 19201fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.setClassName(ScrollView.class.getName()); 19211fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.isEnabled()) { 19221fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final int scrollRange = nsvHost.getScrollRange(); 19231fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (scrollRange > 0) { 19241fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.setScrollable(true); 19251fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.getScrollY() > 0) { 19261fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD); 19271fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19281fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell if (nsvHost.getScrollY() < scrollRange) { 19291fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell info.addAction(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD); 19301fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19311fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19321fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19331fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19341fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell 19351fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell @Override 19361fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 19371fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell super.onInitializeAccessibilityEvent(host, event); 19381fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final NestedScrollView nsvHost = (NestedScrollView) host; 19391fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell event.setClassName(ScrollView.class.getName()); 19401fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event); 19411fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell final boolean scrollable = nsvHost.getScrollRange() > 0; 19421fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell record.setScrollable(scrollable); 19431fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell record.setScrollX(nsvHost.getScrollX()); 19441fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell record.setScrollY(nsvHost.getScrollY()); 19451fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell record.setMaxScrollX(nsvHost.getScrollX()); 19461fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell record.setMaxScrollY(nsvHost.getScrollRange()); 19471fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19481fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell } 19491fcce4485ef99aca928ebfb877859c5ecd47716cAdam Powell} 1950