19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2009 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 192ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.content.Context; 202ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.content.res.TypedArray; 21637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.graphics.Canvas; 22637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.graphics.Rect; 23a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganovimport android.os.Bundle; 242ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.util.AttributeSet; 250dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengrenimport android.util.Log; 262ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.FocusFinder; 2733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brownimport android.view.InputDevice; 282ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.KeyEvent; 292ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.MotionEvent; 30637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.view.VelocityTracker; 312ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.View; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 332ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.ViewDebug; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 36a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityEvent; 37a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityNodeInfo; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A HorizontalScrollView 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a horizontal orientation, presenting a horizontal 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 5215279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * takes care of its own scrolling, so does not require a HorizontalScrollView, but 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 5615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>HorizontalScrollView only supports horizontal scrolling. For vertical scrolling, 5715279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * use either {@link ScrollView} or {@link ListView}. 584e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 594e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * @attr ref android.R.styleable#HorizontalScrollView_fillViewport 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class HorizontalScrollView extends FrameLayout { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final int ANIMATED_SCROLL_GAP = ScrollView.ANIMATED_SCROLL_GAP; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final float MAX_SCROLL_FACTOR = ScrollView.MAX_SCROLL_FACTOR; 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 660dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren private static final String TAG = "HorizontalScrollView"; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 71637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private OverScroller mScroller; 7289935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowLeft; 7389935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowRight; 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 78df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell private int mLastMotionX; 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 109a174d7a0d5475dbae2b48f7359abf1637a882896Romain Guy @ViewDebug.ExportedProperty(category = "layout") 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1184296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1194296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 1204e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 121637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverscrollDistance; 122637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverflingDistance; 123637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1244cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell /** 1254cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * ID of the active pointer. This is used to retain consistency during 1264cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * drags/flings if multiple pointers are used. 1274cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell */ 1284cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private int mActivePointerId = INVALID_POINTER; 1294e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1304cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell /** 1314cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * Sentinel value for no current active pointer. 1324cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * Used by {@link #mActivePointerId}. 1334cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell */ 1344cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private static final int INVALID_POINTER = -1; 1354e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context) { 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context, AttributeSet attrs) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.horizontalScrollViewStyle); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context, AttributeSet attrs, int defStyle) { 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = context.obtainStyledAttributes(attrs, 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project android.R.styleable.HorizontalScrollView, defStyle, 0); 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(android.R.styleable.HorizontalScrollView_fillViewport, false)); 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getLeftFadingEdgeStrength() { 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getHorizontalFadingEdgeLength(); 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollX < length) { 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollX / (float) length; 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getRightFadingEdgeStrength() { 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getHorizontalFadingEdgeLength(); 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int rightEdge = getWidth() - mPaddingRight; 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getRight() - mScrollX - rightEdge; 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mRight - mLeft)); 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 196637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller = new OverScroller(getContext()); 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 2004296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 2014296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 2024296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 2034296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 204637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverscrollDistance = configuration.getScaledOverscrollDistance(); 205637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverflingDistance = configuration.getScaledOverflingDistance(); 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this HorizontalScrollView can be scrolled 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidth = child.getWidth(); 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getWidth() < childWidth + mPaddingLeft + mPaddingRight ; 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 257fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * Indicates whether this HorizontalScrollView's content is stretched to 258fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * fill the viewport. 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 261fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * 262fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#HorizontalScrollView_fillViewport 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 269fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * Indicates this HorizontalScrollView whether it should stretch its content width 270fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * to fill the viewport or not. 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's width to the viewport's 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2744e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 275fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#HorizontalScrollView_fillViewport 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int widthMode = MeasureSpec.getMode(widthMeasureSpec); 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (widthMode == MeasureSpec.UNSPECIFIED) { 3099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 312ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 313ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 314ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int width = getMeasuredWidth(); 315ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredWidth() < width) { 316ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 3174e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 318ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, mPaddingTop 319ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy + mPaddingBottom, lp.height); 320ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy width -= mPaddingLeft; 321ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy width -= mPaddingRight; 322ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY); 3234e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 324ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 325ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3328e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isFocused()) { 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_RIGHT); 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null && nextFocused != this && 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(View.FOCUS_RIGHT); 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_LEFT: 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_LEFT); 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_LEFT); 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_RIGHT: 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_RIGHT); 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_RIGHT); 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_LEFT : View.FOCUS_RIGHT); 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 3829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3844cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private boolean inChild(int x, int y) { 3854cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (getChildCount() > 0) { 386352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollX = mScrollX; 3874cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final View child = getChildAt(0); 3884cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell return !(y < child.getTop() 3894cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell || y >= child.getBottom() 390352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || x < child.getLeft() - scrollX 391352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || x >= child.getRight() - scrollX); 3924cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 3934cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell return false; 3944cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 3954e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 39613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initOrResetVelocityTracker() { 39713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 39813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 39913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } else { 40013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.clear(); 40113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 40213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 40313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 40413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initVelocityTrackerIfNotExists() { 40513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 40613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 40713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 40813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 40913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 41013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void recycleVelocityTracker() { 41113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker != null) { 41213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.recycle(); 41313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = null; 41413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 41513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 41613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 41713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka @Override 41813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 41913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (disallowIntercept) { 42013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 42113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka super.requestDisallowInterceptTouchEvent(disallowIntercept); 42313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 4259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 4279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 4299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 4309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 4319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 4359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4434cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell switch (action & MotionEvent.ACTION_MASK) { 4444cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_MOVE: { 4459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionX is set to the x value 4529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4549d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 4559d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 4569d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 4579d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 4589d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 4599d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 4609d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 4610dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (pointerIndex == -1) { 4620dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + activePointerId 4630dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren + " in onInterceptTouchEvent"); 4640dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 4650dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 4660dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 467df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int x = (int) ev.getX(pointerIndex); 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int xDiff = (int) Math.abs(x - mLastMotionX); 4699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (xDiff > mTouchSlop) { 4709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 4714cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mLastMotionX = x; 47213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 47313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 4749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mParent != null) mParent.requestDisallowInterceptTouchEvent(true); 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4774cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4794cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_DOWN: { 480df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int x = (int) ev.getX(); 4814cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) x, (int) ev.getY())) { 4824cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mIsBeingDragged = false; 48313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 4844cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 4854cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 4864e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 4874cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell /* 4884cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * Remember location of down touch. 4894cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * ACTION_DOWN always refers to pointer index 0. 4904cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell */ 4919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionX = x; 4924cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = ev.getPointerId(0); 4939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 49413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initOrResetVelocityTracker(); 49513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 49613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 4979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 4999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 5009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 5019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 5039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5044cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 5079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 5089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 5099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 5104cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = INVALID_POINTER; 511637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0)) { 512df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 513637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 5144cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 5159bc30d31322848d61f518c1db43544988faaba8fAdam Powell case MotionEvent.ACTION_POINTER_DOWN: { 5169bc30d31322848d61f518c1db43544988faaba8fAdam Powell final int index = ev.getActionIndex(); 517df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionX = (int) ev.getX(index); 5189bc30d31322848d61f518c1db43544988faaba8fAdam Powell mActivePointerId = ev.getPointerId(index); 5199bc30d31322848d61f518c1db43544988faaba8fAdam Powell break; 5209bc30d31322848d61f518c1db43544988faaba8fAdam Powell } 5214cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_POINTER_UP: 5224cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell onSecondaryPointerUp(ev); 523df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionX = (int) ev.getX(ev.findPointerIndex(mActivePointerId)); 5249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 5299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 5309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 5329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 5359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 53613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 5379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 5389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 5409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5414cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell switch (action & MotionEvent.ACTION_MASK) { 5424cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_DOWN: { 543b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (getChildCount() == 0) { 544fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown return false; 545fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown } 546b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 547b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 548b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 549b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 550b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 551b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 553352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 554352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 555352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 556352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 557352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 558352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 559352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 560352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 5619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 562df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionX = (int) ev.getX(); 563352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = ev.getPointerId(0); 5649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5654cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 567b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 5680dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (activePointerIndex == -1) { 5690dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 5700dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 5710dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 5720dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 573b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int x = (int) ev.getX(activePointerIndex); 574b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell int deltaX = mLastMotionX - x; 575b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (!mIsBeingDragged && Math.abs(deltaX) > mTouchSlop) { 576b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 577b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 578b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 579b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 580b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell mIsBeingDragged = true; 581b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (deltaX > 0) { 582b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaX -= mTouchSlop; 583b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } else { 584b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaX += mTouchSlop; 585b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 586b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5874cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mIsBeingDragged) { 5884cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // Scroll to follow the motion event 5894cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mLastMotionX = x; 5904cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 591637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldX = mScrollX; 592637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldY = mScrollY; 593637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int range = getScrollRange(); 594e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 595e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 596e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 597e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 598f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (overScrollBy(deltaX, 0, mScrollX, 0, range, 0, 599637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverscrollDistance, 0, true)) { 600637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Break our velocity if we hit a scroll barrier. 601637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mVelocityTracker.clear(); 602637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 603637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 604637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 605e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 606637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int pulledToX = oldX + deltaX; 607637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (pulledToX < 0) { 608637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowLeft.onPull((float) deltaX / getWidth()); 609637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowRight.isFinished()) { 610637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowRight.onRelease(); 611637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 612637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (pulledToX > range) { 613637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowRight.onPull((float) deltaX / getWidth()); 614637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowLeft.isFinished()) { 615637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowLeft.onRelease(); 616637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 617637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 618637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowLeft != null 619637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell && (!mEdgeGlowLeft.isFinished() || !mEdgeGlowRight.isFinished())) { 620df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 621637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 622637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 6234cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 6249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 6259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 6264cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mIsBeingDragged) { 6274cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final VelocityTracker velocityTracker = mVelocityTracker; 6284cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 6294cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell int initialVelocity = (int) velocityTracker.getXVelocity(mActivePointerId); 6304cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 631f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (getChildCount() > 0) { 632637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 633637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell fling(-initialVelocity); 634637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 635f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 636f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell getScrollRange(), 0, 0)) { 637df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 638637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 639637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 64017dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 6414e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 6424cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = INVALID_POINTER; 6434cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mIsBeingDragged = false; 64413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 6459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 646637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowLeft != null) { 647637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowLeft.onRelease(); 648637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowRight.onRelease(); 649637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 6509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6514cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 652352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 653352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 654637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0)) { 655df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 656637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 657352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 658352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mIsBeingDragged = false; 65913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 66013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 661637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowLeft != null) { 662637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowLeft.onRelease(); 663637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowRight.onRelease(); 664637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 665352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 666352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 6674cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_POINTER_UP: 6684cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell onSecondaryPointerUp(ev); 6694cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 6709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 6729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6734e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 6744cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private void onSecondaryPointerUp(MotionEvent ev) { 6754cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 6764cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 6774cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int pointerId = ev.getPointerId(pointerIndex); 6784cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (pointerId == mActivePointerId) { 6794cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // This was our active pointer going up. Choose a new 6804cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // active pointer and adjust accordingly. 6814cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // TODO: Make this decision more intelligent. 6824cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 683df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionX = (int) ev.getX(newPointerIndex); 6844cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 6854cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mVelocityTracker != null) { 6864cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mVelocityTracker.clear(); 6874cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 6884cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 6894cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 6904e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 691637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 69233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown public boolean onGenericMotionEvent(MotionEvent event) { 69333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 69433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown switch (event.getAction()) { 69533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown case MotionEvent.ACTION_SCROLL: { 69633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (!mIsBeingDragged) { 69733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final float hscroll; 69833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if ((event.getMetaState() & KeyEvent.META_SHIFT_ON) != 0) { 69933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown hscroll = -event.getAxisValue(MotionEvent.AXIS_VSCROLL); 70033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } else { 70133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown hscroll = event.getAxisValue(MotionEvent.AXIS_HSCROLL); 70233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 70333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (hscroll != 0) { 70433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int delta = (int) (hscroll * getHorizontalScrollFactor()); 70533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int range = getScrollRange(); 70633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int oldScrollX = mScrollX; 70733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int newScrollX = oldScrollX + delta; 70833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollX < 0) { 70933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollX = 0; 71033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } else if (newScrollX > range) { 71133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollX = range; 71233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 71333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollX != oldScrollX) { 71433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown super.scrollTo(newScrollX, mScrollY); 71533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return true; 71633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 71733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 71833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 71933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 72033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 72133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 72233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return super.onGenericMotionEvent(event); 72333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 72433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown 72533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown @Override 7269edd58e9504cc3f070758e9125c49a72a3642186Michael Jurka public boolean shouldDelayChildPressedState() { 7279edd58e9504cc3f070758e9125c49a72a3642186Michael Jurka return true; 7289edd58e9504cc3f070758e9125c49a72a3642186Michael Jurka } 7299edd58e9504cc3f070758e9125c49a72a3642186Michael Jurka 7309edd58e9504cc3f070758e9125c49a72a3642186Michael Jurka @Override 731637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 732637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell boolean clampedX, boolean clampedY) { 733637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Treat animating scrolls differently; see #computeScroll() for why. 734637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mScroller.isFinished()) { 735637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollX = scrollX; 736637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollY = scrollY; 7370fd89bf7221431260883cee4597e2db942d799a0Romain Guy invalidateParentIfNeeded(); 738637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (clampedX) { 739637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller.springBack(mScrollX, mScrollY, 0, getScrollRange(), 0, 0); 740637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 741637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 742637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.scrollTo(scrollX, scrollY); 743637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 744e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy 745e72cf7341a608402309ce894fc12d050cc7c0e14Romain Guy awakenScrollBars(); 746637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 747637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 748a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 749a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov public boolean performAccessibilityAction(int action, Bundle arguments) { 75048d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov if (super.performAccessibilityAction(action, arguments)) { 75148d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return true; 75248d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov } 753a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov switch (action) { 754a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: { 755fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (!isEnabled()) { 756fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov return false; 757fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 758a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportWidth = getWidth() - mPaddingLeft - mPaddingRight; 759a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollX = Math.min(mScrollX + viewportWidth, getScrollRange()); 760a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollX != mScrollX) { 761a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(targetScrollX, 0); 762a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 763a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 764a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 765a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: { 766fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (!isEnabled()) { 767fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov return false; 768fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 769a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportWidth = getWidth() - mPaddingLeft - mPaddingRight; 770a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollX = Math.max(0, mScrollX - viewportWidth); 771a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollX != mScrollX) { 772a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(targetScrollX, 0); 773a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 774a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 775a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 776a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 77748d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return false; 778a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 779a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov 780a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov @Override 781a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 782a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityNodeInfo(info); 7838a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov info.setClassName(HorizontalScrollView.class.getName()); 784a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int scrollRange = getScrollRange(); 785a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (scrollRange > 0) { 786a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov info.setScrollable(true); 787fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (isEnabled() && mScrollX > 0) { 788a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD); 789a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 790fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (isEnabled() && mScrollX < scrollRange) { 791a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD); 792a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 793a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 794a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 795a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 796a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 797a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 798a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityEvent(event); 7998a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov event.setClassName(HorizontalScrollView.class.getName()); 800d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollable(getScrollRange() > 0); 801d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollX(mScrollX); 802d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollY(mScrollY); 803d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollX(getScrollRange()); 804d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollY(mScrollY); 805a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 806a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 8070b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getScrollRange() { 8080b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = 0; 8090b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (getChildCount() > 0) { 8100b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell View child = getChildAt(0); 8110b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange = Math.max(0, 812637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell child.getWidth() - (getWidth() - mPaddingLeft - mPaddingRight)); 8130b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 8140b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 8150b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 8169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 8199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in this View's bounds 8209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (excluding fading edges) pretending that this View's left is located at 8219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the parameter left. 8229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 8239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param leftFocus look for a candidate is the one at the left of the bounds 8259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if leftFocus is true, or at the right of the bounds if leftFocus 8269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is false 8279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the bounds in which a focusable must be 8289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found (the fading edge is assumed to start at this position) 8299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param preferredFocusable the View that has highest priority and will be 8309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * returned if it is within my bounds (null is valid) 8319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can be found 8329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInMyBounds(final boolean leftFocus, 8349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int left, View preferredFocusable) { 8359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The fading edge's transparent side should be considered for focus 8379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * since it's mostly visible, so we divide the actual fading edge length 8389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * by 2. 8399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int fadingEdgeLength = getHorizontalFadingEdgeLength() / 2; 8419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int leftWithoutFadingEdge = left + fadingEdgeLength; 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int rightWithoutFadingEdge = left + getWidth() - fadingEdgeLength; 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((preferredFocusable != null) 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getLeft() < rightWithoutFadingEdge) 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getRight() > leftWithoutFadingEdge)) { 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return preferredFocusable; 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return findFocusableViewInBounds(leftFocus, leftWithoutFadingEdge, 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rightWithoutFadingEdge); 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 8569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param leftFocus look for a candidate is the one at the left of the bounds 8609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if leftFocus is true, or at the right of the bounds if 8619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * leftFocus is false 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the bounds in which a focusable must be 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param right the right offset of the bounds in which a focusable must 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean leftFocus, int left, int right) { 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its left is below the bound's 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * left, and its right is above the bound's right. A partially 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewLeft = view.getLeft(); 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewRight = view.getRight(); 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (left < viewRight && viewLeft < right) { 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (left < viewLeft) && 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewRight < right); 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (leftFocus && viewLeft < focusCandidate.getLeft()) || 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!leftFocus && viewRight > focusCandidate.getRight()); 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page left or right and give the focus 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the leftmost/rightmost component in the new visible area. If no 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page left or {@link android.view.View#FOCUS_RIGHT} 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page right 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean right = direction == View.FOCUS_RIGHT; 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (right) { 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = getScrollX() + width; 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 956ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View view = getChildAt(0); 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.left + width > view.getRight()) { 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = view.getRight() - width; 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = getScrollX() - width; 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.left < 0) { 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = 0; 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = mTempRect.left + width; 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.left, mTempRect.right); 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the left or right and give the focus 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the leftmost/rightmost component in the new visible area. If no 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the left of the view or {@link android.view.View#FOCUS_RIGHT} 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the right 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean right = direction == View.FOCUS_RIGHT; 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = 0; 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = width; 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (right) { 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 994ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View view = getChildAt(0); 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = view.getRight(); 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = mTempRect.right - width; 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.left, mTempRect.right); 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>left</code> and 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>right</code> visible. This method attempts to give the focus 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the new visible area, the focus is reclaimed by this scrollview.</p> 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go left {@link android.view.View#FOCUS_RIGHT} to right 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the new area to be made visible 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param right the right offset of the new area to be made visible 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int left, int right) { 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerLeft = getScrollX(); 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerRight = containerLeft + width; 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean goLeft = direction == View.FOCUS_LEFT; 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(goLeft, left, right); 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (left >= containerLeft && right <= containerRight) { 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = goLeft ? (left - containerLeft) : (right - containerRight); 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(delta); 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10352ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (newFocused != findFocus()) newFocused.requestFocus(direction); 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to a left or right arrow click. 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 10449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump)) { 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(scrollDelta); 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_LEFT && getScrollX() < scrollDelta) { 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollX(); 1068ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } else if (direction == View.FOCUS_RIGHT && getChildCount() > 0) { 10694e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1070ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daRight = getChildAt(0).getRight(); 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenRight = getScrollX() + getWidth(); 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (daRight - screenRight < maxJump) { 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = daRight - screenRight; 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(direction == View.FOCUS_RIGHT ? scrollDelta : -scrollDelta); 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return !isWithinDeltaOfScreen(descendant, 0); 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 within delta 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isWithinDeltaOfScreen(View descendant, int delta) { 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.right + delta) >= getScrollX() 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (mTempRect.left - delta) <= (getScrollX() + getWidth()); 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a X delta 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the X axis 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollX(int delta) { 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(delta, 0); 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(delta, 0); 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 11413fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 11423fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 11433fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 11443fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 1147f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int width = getWidth() - mPaddingRight - mPaddingLeft; 1148f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int right = getChildAt(0).getWidth(); 1149f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxX = Math.max(0, right - width); 1150f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollX = mScrollX; 1151f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX; 1152f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 1153f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(scrollX, mScrollY, dx, 0); 1154df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall width of all of its 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeHorizontalScrollRange() { 1180a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 1181a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentWidth = getWidth() - mPaddingLeft - mPaddingRight; 11820b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 1183a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentWidth; 11840b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11854e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1186637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = getChildAt(0).getRight(); 1187637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollX = mScrollX; 1188637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int overscrollRight = Math.max(0, scrollRange - contentWidth); 1189637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (scrollX < 0) { 1190637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange -= scrollX; 1191637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (scrollX > overscrollRight) { 1192637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange += scrollX - overscrollRight; 1193637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1194637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1195637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 11960b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11974e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 11980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 11990b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeHorizontalScrollOffset() { 12000b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeHorizontalScrollOffset()); 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, mPaddingTop 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingBottom, lp.height); 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + heightUsed, lp.height); 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED); 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 125517dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 1256637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (oldX != x || oldY != y) { 1257e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int range = getScrollRange(); 1258e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 1259e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 1260e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 1261e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1262e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio overScrollBy(x - oldX, y - oldY, oldX, oldY, range, 0, 1263637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverflingDistance, 0, false); 1264637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 1265637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1266e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 1267637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (x < 0 && oldX >= 0) { 1268637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowLeft.onAbsorb((int) mScroller.getCurrVelocity()); 1269637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (x > range && oldX <= range) { 1270637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowRight.onAbsorb((int) mScroller.getCurrVelocity()); 1271637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 12729d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell } 12739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1274e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1275e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy if (!awakenScrollBars()) { 1276df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1277e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy } 12789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 12839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 12879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 12889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 12909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 12919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 12959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(scrollDelta, 0); 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 * If rect is off screen, scroll just enough to get it (or at least the 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 13049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 13059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(delta, 0); 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(delta, 0); 13159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the X direction in order to get 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1329ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenLeft = getScrollX(); 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenRight = screenLeft + width; 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getHorizontalFadingEdgeLength(); 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for left fading edge as long as rect isn't at very left 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.left > 0) { 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenLeft += fadingEdge; 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for right fading edge as long as rect isn't at very right 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.right < getChildAt(0).getWidth()) { 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenRight -= fadingEdge; 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollXDelta = 0; 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.right > screenRight && rect.left > screenLeft) { 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move right to get it in view: move right just enough so 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.width() > width) { 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 13569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta += (rect.left - screenLeft); 13579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at right of screen 13599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta += (rect.right - screenRight); 13609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1363ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int right = getChildAt(0).getRight(); 13649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToRight = right - screenRight; 13659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta = Math.min(scrollXDelta, distanceToRight); 13669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.left < screenLeft && rect.right < screenRight) { 13689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move right to get it in view: move right just enough so that 13699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.width() > width) { 13739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta -= (screenRight - rect.right); 13759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at left 13779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta -= (screenLeft - rect.left); 13789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the left our content 13819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta = Math.max(scrollXDelta, -getScrollX()); 13829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollXDelta; 13849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 13882ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (!mIsLayoutDirty) { 13892ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne scrollToChild(focused); 13902ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne } else { 13912ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne // The child may not be laid out yet, we can't compute the scroll yet 13922ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne mChildToScrollTo = focused; 13939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 13959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 14009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 14019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 14039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 14049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 14079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 14089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 14109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 14119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 14129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_RIGHT; 14139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 14149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_LEFT; 14159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 14189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 14199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 14209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 14219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 14239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 14279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 14319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 14359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 14369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 14379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 14389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 14399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 14419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 14459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 14469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 14479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 14519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 14529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 14539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Give a child focus if it needs it 14549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 14559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(mChildToScrollTo); 14569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 14589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1459f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa // Calling this with the present values causes it to re-claim them 14609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 14619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 14659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 14669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 14689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 14699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 14709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = mRight - mLeft; 14729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isWithinDeltaOfScreen(currentFocused, maxJump)) { 14749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 14759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 14769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 14779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(scrollDelta); 14789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1482f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa * Return true if child is a descendant of parent, (or equal to the parent). 14839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1484e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static boolean isViewDescendantOf(View child, View parent) { 14859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 14869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 14879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 14909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 14919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 14949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 14959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityX The initial velocity in the X direction. Positive 1497f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa * numbers mean that the finger/cursor is moving down the screen, 14989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the left. 14999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityX) { 1501ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1502ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int width = getWidth() - mPaddingRight - mPaddingLeft; 1503ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int right = getChildAt(0).getWidth(); 15044e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 15054e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira mScroller.fling(mScrollX, mScrollY, velocityX, 0, 0, 1506637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell Math.max(0, right - width), 0, 0, width/2, 0); 15074e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1508ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final boolean movingRight = velocityX > 0; 15094e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 15102ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne View currentFocused = findFocus(); 1511ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View newFocused = findFocusableViewInMyBounds(movingRight, 15122ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne mScroller.getFinalX(), currentFocused); 15134e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1514ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused == null) { 1515ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy newFocused = this; 1516ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 15174e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 15182ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (newFocused != currentFocused) { 15192ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne newFocused.requestFocus(movingRight ? View.FOCUS_RIGHT : View.FOCUS_LEFT); 1520ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 15214e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1522df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 15239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 15289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 15309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15312ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne @Override 15329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 15339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 15349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 15359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 15369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 15379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 15389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 15399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 15409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1544637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1545637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void setOverScrollMode(int mode) { 1546637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mode != OVER_SCROLL_NEVER) { 1547637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowLeft == null) { 15484e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira Context context = getContext(); 154989935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowLeft = new EdgeEffect(context); 155089935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowRight = new EdgeEffect(context); 1551637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1552637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 1553637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowLeft = null; 1554637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowRight = null; 1555637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1556637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.setOverScrollMode(mode); 1557637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1558637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 15592243e555b061254f7f0f72ca1d6cd44db6c266faRomain Guy @SuppressWarnings({"SuspiciousNameCombination"}) 1560637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1561637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void draw(Canvas canvas) { 1562637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.draw(canvas); 1563637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowLeft != null) { 1564637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollX = mScrollX; 1565637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowLeft.isFinished()) { 1566637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 15677d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int height = getHeight() - mPaddingTop - mPaddingBottom; 1568637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1569637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.rotate(270); 15707d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(-height + mPaddingTop, Math.min(0, scrollX)); 15717d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell mEdgeGlowLeft.setSize(height, getWidth()); 1572637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowLeft.draw(canvas)) { 1573df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1574637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1575637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1576637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1577637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowRight.isFinished()) { 1578637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 1579637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int width = getWidth(); 15807d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int height = getHeight() - mPaddingTop - mPaddingBottom; 1581637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1582637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.rotate(90); 15837d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(-mPaddingTop, 1584b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira -(Math.max(getScrollRange(), scrollX) + width)); 1585b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowRight.setSize(height, width); 1586637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowRight.draw(canvas)) { 1587df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1588637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1589637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1590637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1591637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1592637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1593637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1594e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static int clamp(int n, int my, int child) { 15959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 15969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 15979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my + n) > child) { 15999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child - my; 16009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 16029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1604