ScrollView.java revision e9a16a5a3e7e41551e8c95b84d0e2af0dd130afe
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 1990f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powellimport android.os.Build; 20d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglioimport android.os.Parcel; 21d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglioimport android.os.Parcelable; 2217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powellimport com.android.internal.R; 2317dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 26637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.graphics.Canvas; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 28a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganovimport android.os.Bundle; 29ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrickimport android.os.StrictMode; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 310dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengrenimport android.util.Log; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 3333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brownimport android.view.InputDevice; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 392ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.ViewDebug; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 42a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityEvent; 43a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityNodeInfo; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 5615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>You should never use a ScrollView with a {@link ListView}, because 5715279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * ListView takes care of its own vertical scrolling. Most importantly, doing this 5815279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * defeats all of the important optimizations in ListView for dealing with 5915279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * large lists, since it effectively forces the ListView to display its entire 6015279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * list of items to fill up the infinite container supplied by ScrollView. 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 654e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 6615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>ScrollView only supports vertical scrolling. For horizontal scrolling, 6715279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * use {@link HorizontalScrollView}. 68fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * 69fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 760dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren private static final String TAG = "ScrollView"; 770dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 81637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private OverScroller mScroller; 8289935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowTop; 8389935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowBottom; 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 88df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell private int mLastMotionY; 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 119a174d7a0d5475dbae2b48f7359abf1637a882896Romain Guy @ViewDebug.ExportedProperty(category = "layout") 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1284296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1294296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 1304e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 131637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverscrollDistance; 132637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverflingDistance; 133637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 134bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 135bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 136bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 137bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 138bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 139ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 140ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick /** 14110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * Used during scrolling to retrieve the new offset within the window. 14210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 14310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell private final int[] mScrollOffset = new int[2]; 14410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell private final int[] mScrollConsumed = new int[2]; 14510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 14610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 147ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * The StrictMode "critical time span" objects to catch animation 148ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * stutters. Non-null when a time-sensitive animation is 149ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * in-flight. Must call finish() on them when done animating. 150ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * These are no-ops on user builds. 151ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick */ 152ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mScrollStrictSpan = null; // aka "drag" 153ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mFlingStrictSpan = null; 154ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 155bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 156bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 157bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 158bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 159bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 161d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio private SavedState mSavedState; 162d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 171617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette public ScrollView(Context context, AttributeSet attrs, int defStyleAttr) { 172617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette this(context, attrs, defStyleAttr, 0); 173617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette } 174617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette 175617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette public ScrollView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 176617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette super(context, attrs, defStyleAttr, defStyleRes); 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette final TypedArray a = context.obtainStyledAttributes( 180617feb99a06e7ffb3894e86a286bf30e085f321aAlan Viverette attrs, com.android.internal.R.styleable.ScrollView, defStyleAttr, defStyleRes); 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 188e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy public boolean shouldDelayChildPressedState() { 189e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy return true; 190e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy } 191e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy 192e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy @Override 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 232637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller = new OverScroller(getContext()); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 2364296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 2374296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 2384296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 2394296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 240637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverscrollDistance = configuration.getScaledOverscrollDistance(); 241637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverflingDistance = configuration.getScaledOverflingDistance(); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2964e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 297fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 3094e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 310fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 347ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 348ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 349ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 350ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 351ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 3524e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 3539c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 3549c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy mPaddingLeft + mPaddingRight, lp.width); 355ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 356ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 357ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 358ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 3594e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 360ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 361ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3688e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3832d4cff64b4c864aa5f6859b73ffa65e31ee915acRomain Guy if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 3849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 4069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 4079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 4089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 4109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 4139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 4149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 4199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4219f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 4229f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 423352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollY = mScrollY; 4249f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 425352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell return !(y < child.getTop() - scrollY 426352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || y >= child.getBottom() - scrollY 4279f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 4289f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 4299f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4309f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 4319f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4329f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 43313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initOrResetVelocityTracker() { 43413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 43513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 43613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } else { 43713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.clear(); 43813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 44113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initVelocityTrackerIfNotExists() { 44213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 44313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 44413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 44713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void recycleVelocityTracker() { 44813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker != null) { 44913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.recycle(); 45013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = null; 45113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 45213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 45313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 45413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka @Override 45513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 45613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (disallowIntercept) { 45713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 45813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 45913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka super.requestDisallowInterceptTouchEvent(disallowIntercept); 46013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 46113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 46213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 4699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 4739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4810278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell /* 4820278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell * Don't try to intercept touch if we can't scroll anyway. 4830278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell */ 4840278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell if (getScrollY() == 0 && !canScrollVertically(1)) { 4850278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell return false; 4860278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell } 4870278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell 488bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 489bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4999d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 5009d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 5019d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 5029d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 5039d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 5049d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 5059d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 5060dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (pointerIndex == -1) { 5070dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + activePointerId 5080dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren + " in onInterceptTouchEvent"); 5090dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 5100dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 5110dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 512df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(pointerIndex); 513df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int yDiff = Math.abs(y - mLastMotionY); 51410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (yDiff > mTouchSlop && (getNestedScrollAxes() & SCROLL_AXIS_VERTICAL) == 0) { 5159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 516f7b4accbda1a4d98a5fadbf3984cb9666a4fe9e9Romain Guy mLastMotionY = y; 51713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 51813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 519ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan == null) { 520ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 521ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 522b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 523b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 524b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 525b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 528bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 530bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 531df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(); 5324cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 5339f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mIsBeingDragged = false; 53413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 5359f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato break; 5369f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 5379f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 538bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /* 539bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Remember location of down touch. 540bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ACTION_DOWN always refers to pointer index 0. 541bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 5429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 543bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 54513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initOrResetVelocityTracker(); 54613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 5479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 5499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 5509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 5519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 553ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mIsBeingDragged && mScrollStrictSpan == null) { 554ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 555ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 556e9a16a5a3e7e41551e8c95b84d0e2af0dd130afeAdam Powell startNestedScroll(SCROLL_AXIS_VERTICAL); 5579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 558bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 5619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 5629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 5639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 564bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 56513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 566637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 567df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 568637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 569e9a16a5a3e7e41551e8c95b84d0e2af0dd130afeAdam Powell stopNestedScroll(); 570bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 571bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 572bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 5739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 5789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 5799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 5819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 5849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 58513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 5869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 5879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 5899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 590bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 591bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 592b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (getChildCount() == 0) { 593fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown return false; 594fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown } 595b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 596b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 597b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 598b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 599b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 600b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 6014e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 602352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 603352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 604352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 605352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 606352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 607352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 608ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 609ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 610ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 611ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 612352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 613352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 6149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 615df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(); 616bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 61710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell startNestedScroll(SCROLL_AXIS_VERTICAL); 6189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 619bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 6209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 621b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 6220dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (activePointerIndex == -1) { 6230dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 6240dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 6250dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 6260dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 627b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int y = (int) ev.getY(activePointerIndex); 628b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell int deltaY = mLastMotionY - y; 62910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) { 63010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell deltaY -= mScrollConsumed[1] + mScrollOffset[1]; 63110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 632b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { 633b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 634b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 635b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 636b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 637b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell mIsBeingDragged = true; 638b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (deltaY > 0) { 639b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY -= mTouchSlop; 640b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } else { 641b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY += mTouchSlop; 642b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 643b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 6449f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6459f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 6469f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mLastMotionY = y; 6479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 648637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldY = mScrollY; 649637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int range = getScrollRange(); 650e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 65110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 652e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 653e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 654cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // Calling overScrollBy will call onOverScrolled, which 655cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // calls onScrollChanged if applicable. 65610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (overScrollBy(0, deltaY, 0, mScrollY, 0, range, 0, mOverscrollDistance, true) 65710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell && !hasNestedScrollingParent()) { 658637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Break our velocity if we hit a scroll barrier. 659637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mVelocityTracker.clear(); 660637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 661637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 66210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell final int scrolledDeltaY = mScrollY - oldY; 66310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell final int unconsumedY = deltaY - scrolledDeltaY; 66410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (dispatchNestedScroll(0, scrolledDeltaY, 0, unconsumedY, mScrollOffset)) { 66510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell mLastMotionY -= mScrollOffset[1]; 66610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } else if (canOverscroll) { 667637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int pulledToY = oldY + deltaY; 668637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (pulledToY < 0) { 669637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onPull((float) deltaY / getHeight()); 670637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 671637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onRelease(); 672637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 673637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (pulledToY > range) { 674637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onPull((float) deltaY / getHeight()); 675637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 676637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onRelease(); 677637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 678637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 679637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null 680637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 681df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 682637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 683637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 6849f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 685bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 6864e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira case MotionEvent.ACTION_UP: 6879f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6889f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 6899f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 690bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 6919f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 69210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 69310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell flingWithNestedDispatch(-initialVelocity); 69410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } else if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, 69510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell getScrollRange())) { 69610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell postInvalidateOnAnimation(); 69717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 6989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 699bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 700ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 7019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 702bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 703352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 704352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 705637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 706df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 707637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 708352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 709ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 710352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 711352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 7129bc30d31322848d61f518c1db43544988faaba8fAdam Powell case MotionEvent.ACTION_POINTER_DOWN: { 7139bc30d31322848d61f518c1db43544988faaba8fAdam Powell final int index = ev.getActionIndex(); 714df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(index); 7159bc30d31322848d61f518c1db43544988faaba8fAdam Powell mActivePointerId = ev.getPointerId(index); 7169bc30d31322848d61f518c1db43544988faaba8fAdam Powell break; 7179bc30d31322848d61f518c1db43544988faaba8fAdam Powell } 718bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 719bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 720df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); 721bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 7229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 7249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7254e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 726bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 727bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 728bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 729bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 730bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 731bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 732bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 733bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 734bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 735df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(newPointerIndex); 736bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 737bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 738bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 739bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 740bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 741bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 7424e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 743637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 74433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown public boolean onGenericMotionEvent(MotionEvent event) { 74533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 74633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown switch (event.getAction()) { 74733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown case MotionEvent.ACTION_SCROLL: { 74833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (!mIsBeingDragged) { 74933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 75033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (vscroll != 0) { 75133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int delta = (int) (vscroll * getVerticalScrollFactor()); 75233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int range = getScrollRange(); 75333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int oldScrollY = mScrollY; 75433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int newScrollY = oldScrollY - delta; 75533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY < 0) { 75633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = 0; 75733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } else if (newScrollY > range) { 75833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = range; 75933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 76033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY != oldScrollY) { 76133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown super.scrollTo(mScrollX, newScrollY); 76233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return true; 76333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 76433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 76533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 76633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 76733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 76833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 76933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return super.onGenericMotionEvent(event); 77033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 77133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown 77233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown @Override 773637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 774637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell boolean clampedX, boolean clampedY) { 775637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Treat animating scrolls differently; see #computeScroll() for why. 776637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mScroller.isFinished()) { 777cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldX = mScrollX; 778cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldY = mScrollY; 779637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollX = scrollX; 780637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollY = scrollY; 7810fd89bf7221431260883cee4597e2db942d799a0Romain Guy invalidateParentIfNeeded(); 782cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette onScrollChanged(mScrollX, mScrollY, oldX, oldY); 783637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (clampedY) { 784637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 785637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 786637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 787637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.scrollTo(scrollX, scrollY); 788637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 789e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy 790e72cf7341a608402309ce894fc12d050cc7c0e14Romain Guy awakenScrollBars(); 791637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 792637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 793a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 794a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov public boolean performAccessibilityAction(int action, Bundle arguments) { 79548d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov if (super.performAccessibilityAction(action, arguments)) { 79648d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return true; 79748d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov } 798fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (!isEnabled()) { 799fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov return false; 800fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 801a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov switch (action) { 802a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: { 803a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 804a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.min(mScrollY + viewportHeight, getScrollRange()); 805a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 806a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 807a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 808a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 809a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 810a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: { 811a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 812a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.max(mScrollY - viewportHeight, 0); 813a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 814a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 815a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 816a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 817a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 818a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 81948d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return false; 820a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 821a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov 822a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov @Override 823a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 824a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityNodeInfo(info); 8258a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov info.setClassName(ScrollView.class.getName()); 826fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (isEnabled()) { 827fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov final int scrollRange = getScrollRange(); 828fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (scrollRange > 0) { 829fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.setScrollable(true); 830fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY > 0) { 831fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD); 832fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 833fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY < scrollRange) { 834fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD); 835fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 836a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 837a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 838a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 839a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 840a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 841a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 842a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityEvent(event); 8438a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov event.setClassName(ScrollView.class.getName()); 844d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov final boolean scrollable = getScrollRange() > 0; 845d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollable(scrollable); 846d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollX(mScrollX); 847d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollY(mScrollY); 848d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollX(mScrollX); 849d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollY(getScrollRange()); 850a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 851a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 852637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int getScrollRange() { 853637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = 0; 854637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (getChildCount() > 0) { 855637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell View child = getChildAt(0); 856637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange = Math.max(0, 857637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell child.getHeight() - (getHeight() - mPaddingBottom - mPaddingTop)); 858637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 859637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 860637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 861637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 9849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 9949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 10045435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson mTempRect.bottom = view.getBottom() + mPaddingBottom; 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 10162ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * the new visible area, the focus is reclaimed by this ScrollView.</p> 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 10192ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10442ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (newFocused != findFocus()) newFocused.requestFocus(direction); 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10657d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 1078ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1079ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 10805435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson int screenBottom = getScrollY() + getHeight() - mPaddingBottom; 1081ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 1082ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 1083ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 10999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 11127d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11197d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 11247d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 11493fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 11503fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 11513fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 11523fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 1155f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 1156f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 1157f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 1158f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 1159f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 1160f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 1161f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 1162df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 1166ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1167ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1168ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1169ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 11809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 11819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 11839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 1192a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 1193a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 11940b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 1195a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 11960b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11974e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1198637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = getChildAt(0).getBottom(); 1199637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1200637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 1201637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (scrollY < 0) { 1202637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange -= scrollY; 1203637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (scrollY > overscrollBottom) { 1204637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange += scrollY - overscrollBottom; 1205637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1206637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1207637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12100b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 12110b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 12120b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 12130b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 12559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 12569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 12579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 12599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 12609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 12619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 12629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 12649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 12669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 126717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 1268637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (oldX != x || oldY != y) { 1269e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int range = getScrollRange(); 1270e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 1271e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 1272e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 1273e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1274e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio overScrollBy(x - oldX, y - oldY, oldX, oldY, 0, range, 1275637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 0, mOverflingDistance, false); 1276637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 1277637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1278e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 1279637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (y < 0 && oldY >= 0) { 1280637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 1281637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (y > range && oldY <= range) { 1282637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 1283637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 12849d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell } 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1286e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1287e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy if (!awakenScrollBars()) { 1288e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy // Keep on drawing until the animation has finished. 1289df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1290e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy } 1291ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } else { 1292ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1293ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1294ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1295ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 12969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 13039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 13059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 13149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1347ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 13569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 13579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 13589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 13619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 13629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 13639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 13669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 13689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 13699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 13739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 13759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 13779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 13789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1381ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 13829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 13839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 13849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 13869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 13879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 13889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 13899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 13919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 13929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 13939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 13959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 13969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 13999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 14009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 14029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 14062ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (!mIsLayoutDirty) { 14072ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne scrollToChild(focused); 14082ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne } else { 14092ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne // The child may not be laid out yet, we can't compute the scroll yet 14102ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne mChildToScrollTo = focused; 14119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 14139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 14179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 14189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 14199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 14219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 14229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 14259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 14269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 14289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 14299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 14309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 14319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 14329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 14339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 14369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 14379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 14389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 14399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 14419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 14459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 14494e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 14509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 14539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 14549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 14559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 14569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 14579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 14599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 14639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 14649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 14659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1468ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick protected void onDetachedFromWindow() { 1469ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick super.onDetachedFromWindow(); 1470ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1471ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1472ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1473ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1474ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1475ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1476ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1477ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1478ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1479ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1480ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1481ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick @Override 14829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 14839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 14849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 14854e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira // Give a child focus if it needs it 14869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 14879c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy scrollToChild(mChildToScrollTo); 14889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 14909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14917a46dde1ae56a85fcb5cdac91173424b6355bf3cChet Haase if (!isLaidOut()) { 1492d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio if (mSavedState != null) { 1493d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = mSavedState.scrollPosition; 1494d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mSavedState = null; 1495d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } // mScrollY default value is "0" 1496d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio 1497d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; 1498d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio final int scrollRange = Math.max(0, 1499d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio childHeight - (b - t - mPaddingBottom - mPaddingTop)); 1500d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio 1501d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio // Don't forget to clamp 1502d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio if (mScrollY > scrollRange) { 1503d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = scrollRange; 1504d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } else if (mScrollY < 0) { 1505d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = 0; 1506d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1507d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1508d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1509f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa // Calling this with the present values causes it to re-claim them 15109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 15119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 15149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 15159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 15169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 15189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 15199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 15209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15217d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 15227d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 15237d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 15247d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 15259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 15269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 15279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 15289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 15299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15304e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 15319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1533f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa * Return true if child is a descendant of parent, (or equal to the parent). 15349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1535e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static boolean isViewDescendantOf(View child, View parent) { 15369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 15379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 15389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 15419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 15424e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 15439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 15469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 154852964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * numbers mean that the finger/cursor is moving down the screen, 15499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 15509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1552ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1553ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1554ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 15554e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 15564e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 1557637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell Math.max(0, bottom - height), 0, height/2); 15584e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1559ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan == null) { 1560ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = StrictMode.enterCriticalSpan("ScrollView-fling"); 1561ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1562ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1563df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 15649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 156710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell private void flingWithNestedDispatch(int velocityY) { 156810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell if (mScrollY == 0 && velocityY < 0 || 156910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell mScrollY == getScrollRange() && velocityY > 0) { 157010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell dispatchNestedFling(0, velocityY); 157110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } else { 157210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell fling(velocityY); 157310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 157410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 157510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 1576ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private void endDrag() { 1577ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mIsBeingDragged = false; 1578ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 157913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 1580ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1581ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mEdgeGlowTop != null) { 1582ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowTop.onRelease(); 1583ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowBottom.onRelease(); 1584ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1585ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1586ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1587ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1588ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1589ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1590ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1591ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 15929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 15949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 15969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 159752964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne @Override 15989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 15999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 16009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 16019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 16029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 16039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 16049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 16059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 16069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1607637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1608637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1609637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1610637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1611637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void setOverScrollMode(int mode) { 1612637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mode != OVER_SCROLL_NEVER) { 1613637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop == null) { 16144e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira Context context = getContext(); 161589935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowTop = new EdgeEffect(context); 161689935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowBottom = new EdgeEffect(context); 1617637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1618637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 1619637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop = null; 1620637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom = null; 1621637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1622637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.setOverScrollMode(mode); 1623637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1624637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1625637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 162610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 162710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell return (nestedScrollAxes & SCROLL_AXIS_VERTICAL) != 0; 162810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 162910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 163010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 163110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @inheritDoc 163210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 163310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 163410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onStopNestedScroll(View target) { 163510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell super.onStopNestedScroll(target); 163610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 163710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 163810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 163910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 164010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell int dxUnconsumed, int dyUnconsumed) { 164110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell scrollBy(0, dyUnconsumed); 164210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 164310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 164410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 164510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @inheritDoc 164610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 164710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 164810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public boolean onNestedFling(View target, float velocityX, float velocityY) { 164910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell flingWithNestedDispatch((int) velocityY); 165010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell return true; 165110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell } 165210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 165310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell @Override 1654637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void draw(Canvas canvas) { 1655637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.draw(canvas); 1656637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null) { 1657637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1658637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 1659637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 16607d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1661637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 16627d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(mPaddingLeft, Math.min(0, scrollY)); 1663b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowTop.setSize(width, getHeight()); 1664637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop.draw(canvas)) { 1665df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1666637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1667637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1668637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1669637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 1670637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 16717d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1672637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int height = getHeight(); 1673637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 16747d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(-width + mPaddingLeft, 16757d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell Math.max(getScrollRange(), scrollY) + height); 1676637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.rotate(180, width, 0); 1677b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowBottom.setSize(width, height); 1678637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 1679df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1680637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1681637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1682637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 16839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1686e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static int clamp(int n, int my, int child) { 16879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 16889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 16899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 16929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 16959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 16989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 16999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 17009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 17019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 17029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 17039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 17049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 17059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 17069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 17079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 17089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 17099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 17109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 17119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 17129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 17139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 17149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1715d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1716d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1717d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio protected void onRestoreInstanceState(Parcelable state) { 171890f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell if (mContext.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.JELLY_BEAN_MR2) { 171990f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Some old apps reused IDs in ways they shouldn't have. 172090f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Don't break them, but they don't get scroll state restoration. 172190f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell super.onRestoreInstanceState(state); 172290f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell return; 172390f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell } 1724d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState ss = (SavedState) state; 1725d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super.onRestoreInstanceState(ss.getSuperState()); 1726d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mSavedState = ss; 1727d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio requestLayout(); 1728d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1729d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1730d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1731d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio protected Parcelable onSaveInstanceState() { 173290f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell if (mContext.getApplicationInfo().targetSdkVersion <= Build.VERSION_CODES.JELLY_BEAN_MR2) { 173390f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Some old apps reused IDs in ways they shouldn't have. 173490f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell // Don't break them, but they don't get scroll state restoration. 173590f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell return super.onSaveInstanceState(); 173690f339a5a343f82c3c32e4467c54ded94a1807a1Adam Powell } 1737d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio Parcelable superState = super.onSaveInstanceState(); 1738d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState ss = new SavedState(superState); 1739d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio ss.scrollPosition = mScrollY; 1740d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return ss; 1741d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1742d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1743d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio static class SavedState extends BaseSavedState { 1744d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public int scrollPosition; 1745d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1746d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState(Parcelable superState) { 1747d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super(superState); 1748d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1749d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1750d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState(Parcel source) { 1751d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super(source); 1752d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio scrollPosition = source.readInt(); 1753d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1754d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1755d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1756d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public void writeToParcel(Parcel dest, int flags) { 1757d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super.writeToParcel(dest, flags); 1758d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio dest.writeInt(scrollPosition); 1759d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1760d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1761d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1762d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public String toString() { 1763d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return "HorizontalScrollView.SavedState{" 1764d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio + Integer.toHexString(System.identityHashCode(this)) 1765d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio + " scrollPosition=" + scrollPosition + "}"; 1766d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1767d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1768d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public static final Parcelable.Creator<SavedState> CREATOR 1769d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio = new Parcelable.Creator<SavedState>() { 1770d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState createFromParcel(Parcel in) { 1771d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return new SavedState(in); 1772d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1773d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1774d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState[] newArray(int size) { 1775d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return new SavedState[size]; 1776d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1777d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio }; 1778d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1779d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 17809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1781