ScrollView.java revision cb25bd8c2b41fad0f65114c42d8f6e732645dd96
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1917dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powellimport com.android.internal.R; 2017dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 23637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.graphics.Canvas; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 25a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganovimport android.os.Bundle; 26ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrickimport android.os.StrictMode; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 280dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengrenimport android.util.Log; 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 3033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brownimport android.view.InputDevice; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 362ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.ViewDebug; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 39a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityEvent; 40a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityNodeInfo; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 5315279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>You should never use a ScrollView with a {@link ListView}, because 5415279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * ListView takes care of its own vertical scrolling. Most importantly, doing this 5515279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * defeats all of the important optimizations in ListView for dealing with 5615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * large lists, since it effectively forces the ListView to display its entire 5715279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * list of items to fill up the infinite container supplied by ScrollView. 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 624e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 6315279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>ScrollView only supports vertical scrolling. For horizontal scrolling, 6415279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * use {@link HorizontalScrollView}. 65fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * 66fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 730dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren private static final String TAG = "ScrollView"; 740dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 78637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private OverScroller mScroller; 7989935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowTop; 8089935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowBottom; 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 85df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell private int mLastMotionY; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 116a174d7a0d5475dbae2b48f7359abf1637a882896Romain Guy @ViewDebug.ExportedProperty(category = "layout") 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1254296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1264296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 1274e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 128637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverscrollDistance; 129637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverflingDistance; 130637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 131bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 132bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 133bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 134bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 135bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 136ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 137ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick /** 138ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * The StrictMode "critical time span" objects to catch animation 139ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * stutters. Non-null when a time-sensitive animation is 140ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * in-flight. Must call finish() on them when done animating. 141ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * These are no-ops on user builds. 142ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick */ 143ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mScrollStrictSpan = null; // aka "drag" 144ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mFlingStrictSpan = null; 145ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 146bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 147bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 148bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 149bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 150bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs, int defStyle) { 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.ScrollView, defStyle, 0); 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 173e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy public boolean shouldDelayChildPressedState() { 174e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy return true; 175e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy } 176e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy 177e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy @Override 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 217637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller = new OverScroller(getContext()); 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 2214296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 2224296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 2234296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 2244296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 225637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverscrollDistance = configuration.getScaledOverscrollDistance(); 226637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverflingDistance = configuration.getScaledOverflingDistance(); 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2814e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 282fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2944e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 295fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 3099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 332ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 333ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 334ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 335ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 336ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 3374e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 3389c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 3399c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy mPaddingLeft + mPaddingRight, lp.width); 340ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 341ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 342ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 343ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 3444e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 345ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 346ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3538e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3682d4cff64b4c864aa5f6859b73ffa65e31ee915acRomain Guy if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 3849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 3869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4069f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 4079f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 408352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollY = mScrollY; 4099f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 410352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell return !(y < child.getTop() - scrollY 411352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || y >= child.getBottom() - scrollY 4129f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 4139f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 4149f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4159f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 4169f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4179f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 41813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initOrResetVelocityTracker() { 41913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 42013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 42113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } else { 42213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.clear(); 42313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 42613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initVelocityTrackerIfNotExists() { 42713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 42813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 42913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 43213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void recycleVelocityTracker() { 43313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker != null) { 43413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.recycle(); 43513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = null; 43613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 43913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka @Override 44013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 44113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (disallowIntercept) { 44213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 44313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka super.requestDisallowInterceptTouchEvent(disallowIntercept); 44513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 44713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 4489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 4509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 4529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 4539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 4549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 4589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4660278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell /* 4670278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell * Don't try to intercept touch if we can't scroll anyway. 4680278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell */ 4690278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell if (getScrollY() == 0 && !canScrollVertically(1)) { 4700278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell return false; 4710278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell } 4720278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell 473bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 474bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4849d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 4859d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 4869d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 4879d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 4889d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 4899d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 4909d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 4910dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (pointerIndex == -1) { 4920dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + activePointerId 4930dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren + " in onInterceptTouchEvent"); 4940dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 4950dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 4960dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 497df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(pointerIndex); 498df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int yDiff = Math.abs(y - mLastMotionY); 4999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (yDiff > mTouchSlop) { 5009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 501f7b4accbda1a4d98a5fadbf3984cb9666a4fe9e9Romain Guy mLastMotionY = y; 50213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 50313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 504ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan == null) { 505ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 506ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 507b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 508b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 509b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 510b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 513bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 515bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 516df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(); 5174cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 5189f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mIsBeingDragged = false; 51913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 5209f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato break; 5219f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 5229f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 523bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /* 524bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Remember location of down touch. 525bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ACTION_DOWN always refers to pointer index 0. 526bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 5279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 528bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 53013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initOrResetVelocityTracker(); 53113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 5329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 5349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 5359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 5369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 538ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mIsBeingDragged && mScrollStrictSpan == null) { 539ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 540ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 5419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 542bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 5459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 5469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 5479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 548bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 54913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 550637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 551df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 552637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 553bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 554bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 555bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 5569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 5619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 5629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 5649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 5679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 56813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 5699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 5709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 5729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 573bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 574bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 575b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (getChildCount() == 0) { 576fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown return false; 577fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown } 578b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 579b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 580b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 581b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 582b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 583b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5844e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 585352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 586352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 587352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 588352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 589352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 590352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 591ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 592ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 593ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 594ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 595352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 596352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 5979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 598df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(); 599bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 6009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 601bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 6029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 603b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 6040dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (activePointerIndex == -1) { 6050dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 6060dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 6070dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 6080dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 609b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int y = (int) ev.getY(activePointerIndex); 610b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell int deltaY = mLastMotionY - y; 611b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { 612b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 613b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 614b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 615b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 616b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell mIsBeingDragged = true; 617b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (deltaY > 0) { 618b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY -= mTouchSlop; 619b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } else { 620b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY += mTouchSlop; 621b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 622b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 6239f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6249f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 6259f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mLastMotionY = y; 6269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 627637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldX = mScrollX; 628637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldY = mScrollY; 629637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int range = getScrollRange(); 630e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 631e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 632e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 633e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 634cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // Calling overScrollBy will call onOverScrolled, which 635cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // calls onScrollChanged if applicable. 636f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (overScrollBy(0, deltaY, 0, mScrollY, 637e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 0, range, 0, mOverscrollDistance, true)) { 638637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Break our velocity if we hit a scroll barrier. 639637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mVelocityTracker.clear(); 640637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 641637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 642e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 643637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int pulledToY = oldY + deltaY; 644637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (pulledToY < 0) { 645637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onPull((float) deltaY / getHeight()); 646637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 647637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onRelease(); 648637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 649637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (pulledToY > range) { 650637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onPull((float) deltaY / getHeight()); 651637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 652637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onRelease(); 653637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 654637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 655637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null 656637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 657df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 658637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 659637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 6609f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 661bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 6624e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira case MotionEvent.ACTION_UP: 6639f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6649f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 6659f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 666bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 6679f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 668f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (getChildCount() > 0) { 669637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 670637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell fling(-initialVelocity); 671637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 672f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, 673f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell getScrollRange())) { 674df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 675637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 676637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 67717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 6789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 679bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 680ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 6819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 682bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 683352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 684352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 685637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 686df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 687637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 688352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 689ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 690352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 691352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 6929bc30d31322848d61f518c1db43544988faaba8fAdam Powell case MotionEvent.ACTION_POINTER_DOWN: { 6939bc30d31322848d61f518c1db43544988faaba8fAdam Powell final int index = ev.getActionIndex(); 694df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(index); 6959bc30d31322848d61f518c1db43544988faaba8fAdam Powell mActivePointerId = ev.getPointerId(index); 6969bc30d31322848d61f518c1db43544988faaba8fAdam Powell break; 6979bc30d31322848d61f518c1db43544988faaba8fAdam Powell } 698bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 699bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 700df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); 701bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 7029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 7049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7054e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 706bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 707bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 708bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 709bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 710bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 711bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 712bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 713bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 714bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 715df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(newPointerIndex); 716bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 717bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 718bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 719bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 720bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 721bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 7224e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 723637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 72433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown public boolean onGenericMotionEvent(MotionEvent event) { 72533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 72633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown switch (event.getAction()) { 72733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown case MotionEvent.ACTION_SCROLL: { 72833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (!mIsBeingDragged) { 72933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 73033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (vscroll != 0) { 73133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int delta = (int) (vscroll * getVerticalScrollFactor()); 73233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int range = getScrollRange(); 73333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int oldScrollY = mScrollY; 73433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int newScrollY = oldScrollY - delta; 73533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY < 0) { 73633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = 0; 73733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } else if (newScrollY > range) { 73833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = range; 73933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY != oldScrollY) { 74133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown super.scrollTo(mScrollX, newScrollY); 74233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return true; 74333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return super.onGenericMotionEvent(event); 75033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 75133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown 75233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown @Override 753637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 754637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell boolean clampedX, boolean clampedY) { 755637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Treat animating scrolls differently; see #computeScroll() for why. 756637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mScroller.isFinished()) { 757cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldX = mScrollX; 758cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldY = mScrollY; 759637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollX = scrollX; 760637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollY = scrollY; 7610fd89bf7221431260883cee4597e2db942d799a0Romain Guy invalidateParentIfNeeded(); 762cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette onScrollChanged(mScrollX, mScrollY, oldX, oldY); 763637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (clampedY) { 764637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 765637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 766637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 767637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.scrollTo(scrollX, scrollY); 768637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 769e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy 770e72cf7341a608402309ce894fc12d050cc7c0e14Romain Guy awakenScrollBars(); 771637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 772637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 773a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 774a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov public boolean performAccessibilityAction(int action, Bundle arguments) { 77548d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov if (super.performAccessibilityAction(action, arguments)) { 77648d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return true; 77748d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov } 778fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (!isEnabled()) { 779fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov return false; 780fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 781a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov switch (action) { 782a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: { 783a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 784a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.min(mScrollY + viewportHeight, getScrollRange()); 785a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 786a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 787a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 788a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 789a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 790a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: { 791a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 792a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.max(mScrollY - viewportHeight, 0); 793a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 794a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 795a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 796a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 797a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 798a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 79948d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return false; 800a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 801a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov 802a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov @Override 803a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 804a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityNodeInfo(info); 8058a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov info.setClassName(ScrollView.class.getName()); 806fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (isEnabled()) { 807fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov final int scrollRange = getScrollRange(); 808fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (scrollRange > 0) { 809fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.setScrollable(true); 810fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY > 0) { 811fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD); 812fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 813fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY < scrollRange) { 814fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD); 815fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 816a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 817a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 818a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 819a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 820a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 821a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 822a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityEvent(event); 8238a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov event.setClassName(ScrollView.class.getName()); 824d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov final boolean scrollable = getScrollRange() > 0; 825d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollable(scrollable); 826d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollX(mScrollX); 827d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollY(mScrollY); 828d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollX(mScrollX); 829d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollY(getScrollRange()); 830a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 831a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 832637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int getScrollRange() { 833637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = 0; 834637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (getChildCount() > 0) { 835637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell View child = getChildAt(0); 836637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange = Math.max(0, 837637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell child.getHeight() - (getHeight() - mPaddingBottom - mPaddingTop)); 838637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 839637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 840637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 841637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 8559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 8609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 8619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 9845435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson mTempRect.bottom = view.getBottom() + mPaddingBottom; 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 9949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 9962ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * the new visible area, the focus is reclaimed by this ScrollView.</p> 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9992ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10242ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (newFocused != findFocus()) newFocused.requestFocus(direction); 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 10449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10457d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 1058ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1059ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 10605435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson int screenBottom = getScrollY() + getHeight() - mPaddingBottom; 1061ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 1062ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 1063ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 10927d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10997d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 11047d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 11293fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 11303fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 11313fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 11323fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 1135f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 1136f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 1137f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 1138f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 1139f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 1140f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 1141f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 1142df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 1146ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1147ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1148ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1149ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 1172a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 1173a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 11740b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 1175a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 11760b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11774e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1178637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = getChildAt(0).getBottom(); 1179637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1180637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 1181637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (scrollY < 0) { 1182637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange -= scrollY; 1183637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (scrollY > overscrollBottom) { 1184637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange += scrollY - overscrollBottom; 1185637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1186637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1187637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11900b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 11910b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 11920b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 11930b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 11979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 124717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 1248637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (oldX != x || oldY != y) { 1249e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int range = getScrollRange(); 1250e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 1251e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 1252e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 1253e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1254e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio overScrollBy(x - oldX, y - oldY, oldX, oldY, 0, range, 1255637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 0, mOverflingDistance, false); 1256637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 1257637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1258e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 1259637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (y < 0 && oldY >= 0) { 1260637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 1261637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (y > range && oldY <= range) { 1262637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 1263637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 12649d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell } 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1266e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1267e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy if (!awakenScrollBars()) { 1268e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy // Keep on drawing until the animation has finished. 1269df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1270e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy } 1271ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } else { 1272ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1273ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1274ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1275ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 12769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 12839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 12869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 12889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 12899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 12939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 12949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 12999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 13009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 13039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 13049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 13169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1327ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 13579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 13589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1361ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 13629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 13639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 13649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 13669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 13679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 13689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 13699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 13739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 13759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 13769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 13799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 13809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 13829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 13862ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (!mIsLayoutDirty) { 13872ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne scrollToChild(focused); 13882ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne } else { 13892ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne // The child may not be laid out yet, we can't compute the scroll yet 13902ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne mChildToScrollTo = focused; 13919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 13939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 13989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 13999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 14019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 14029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 14059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 14069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 14089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 14099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 14109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 14119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 14129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 14139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 14169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 14179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 14189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 14199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 14219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 14259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 14294e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 14309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 14339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 14349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 14359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 14369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 14379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 14399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 14439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 14449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 14459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1448ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick protected void onDetachedFromWindow() { 1449ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick super.onDetachedFromWindow(); 1450ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1451ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1452ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1453ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1454ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1455ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1456ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1457ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1458ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1459ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1460ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1461ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick @Override 14629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 14639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 14649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 14654e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira // Give a child focus if it needs it 14669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 14679c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy scrollToChild(mChildToScrollTo); 14689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 14709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1471f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa // Calling this with the present values causes it to re-claim them 14729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 14739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 14779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 14789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 14809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 14819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 14829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14837d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 14847d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 14857d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 14867d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 14879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 14889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 14899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 14909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 14919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14924e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 14939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1495f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa * Return true if child is a descendant of parent, (or equal to the parent). 14969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1497e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static boolean isViewDescendantOf(View child, View parent) { 14989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 14999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 15009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 15039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 15044e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 15059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 15089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 151052964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * numbers mean that the finger/cursor is moving down the screen, 15119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 15129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1514ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1515ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1516ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 15174e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 15184e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 1519637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell Math.max(0, bottom - height), 0, height/2); 15204e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1521ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan == null) { 1522ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = StrictMode.enterCriticalSpan("ScrollView-fling"); 1523ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1524ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1525df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 15269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1529ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private void endDrag() { 1530ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mIsBeingDragged = false; 1531ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 153213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 1533ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1534ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mEdgeGlowTop != null) { 1535ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowTop.onRelease(); 1536ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowBottom.onRelease(); 1537ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1538ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1539ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1540ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1541ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1542ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1543ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1544ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 15459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 15479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 15499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 155052964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne @Override 15519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 15529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 15539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 15549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 15559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 15569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 15579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 15589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 15599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1560637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1561637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1562637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1563637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1564637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void setOverScrollMode(int mode) { 1565637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mode != OVER_SCROLL_NEVER) { 1566637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop == null) { 15674e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira Context context = getContext(); 156889935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowTop = new EdgeEffect(context); 156989935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowBottom = new EdgeEffect(context); 1570637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1571637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 1572637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop = null; 1573637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom = null; 1574637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1575637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.setOverScrollMode(mode); 1576637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1577637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1578637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1579637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void draw(Canvas canvas) { 1580637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.draw(canvas); 1581637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null) { 1582637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1583637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 1584637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 15857d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1586637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 15877d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(mPaddingLeft, Math.min(0, scrollY)); 1588b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowTop.setSize(width, getHeight()); 1589637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop.draw(canvas)) { 1590df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1591637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1592637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1593637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1594637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 1595637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 15967d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1597637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int height = getHeight(); 1598637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 15997d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(-width + mPaddingLeft, 16007d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell Math.max(getScrollRange(), scrollY) + height); 1601637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.rotate(180, width, 0); 1602b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowBottom.setSize(width, height); 1603637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 1604df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1605637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1606637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1607637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 16089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1611e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static int clamp(int n, int my, int child) { 16129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 16139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 16149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 16179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 16209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 16239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 16249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 16259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 16269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 16279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 16289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 16299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 16319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 16329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 16339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 16359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 16369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 16379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 16399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1641