ScrollView.java revision d6d543977da14adb3ef9322a0b7ec3fdd027a55e
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 19d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglioimport android.os.Parcel; 20d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglioimport android.os.Parcelable; 2117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powellimport com.android.internal.R; 2217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 25637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.graphics.Canvas; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 27a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganovimport android.os.Bundle; 28ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrickimport android.os.StrictMode; 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 300dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengrenimport android.util.Log; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 3233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brownimport android.view.InputDevice; 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 382ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.ViewDebug; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 41a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityEvent; 42a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityNodeInfo; 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 5515279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>You should never use a ScrollView with a {@link ListView}, because 5615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * ListView takes care of its own vertical scrolling. Most importantly, doing this 5715279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * defeats all of the important optimizations in ListView for dealing with 5815279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * large lists, since it effectively forces the ListView to display its entire 5915279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * list of items to fill up the infinite container supplied by ScrollView. 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 644e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 6515279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * <p>ScrollView only supports vertical scrolling. For horizontal scrolling, 6615279cfc566aee7f860ebfdfe9d4a6fbc0497362Scott Main * use {@link HorizontalScrollView}. 67fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * 68fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 750dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren private static final String TAG = "ScrollView"; 760dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 80637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private OverScroller mScroller; 8189935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowTop; 8289935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowBottom; 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 87df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell private int mLastMotionY; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 118a174d7a0d5475dbae2b48f7359abf1637a882896Romain Guy @ViewDebug.ExportedProperty(category = "layout") 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1274296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1284296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 1294e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 130637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverscrollDistance; 131637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverflingDistance; 132637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 133bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 134bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 135bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 136bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 137bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 138ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 139ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick /** 140ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * The StrictMode "critical time span" objects to catch animation 141ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * stutters. Non-null when a time-sensitive animation is 142ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * in-flight. Must call finish() on them when done animating. 143ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * These are no-ops on user builds. 144ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick */ 145ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mScrollStrictSpan = null; // aka "drag" 146ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mFlingStrictSpan = null; 147ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 148bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 149bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 150bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 151bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 152bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 154d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio private SavedState mSavedState; 155d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs, int defStyle) { 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.ScrollView, defStyle, 0); 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 177e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy public boolean shouldDelayChildPressedState() { 178e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy return true; 179e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy } 180e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy 181e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy @Override 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 221637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller = new OverScroller(getContext()); 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 2254296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 2264296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 2274296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 2284296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 229637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverscrollDistance = configuration.getScaledOverscrollDistance(); 230637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverflingDistance = configuration.getScaledOverflingDistance(); 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2854e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 286fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2984e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 299fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 3109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 336ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 337ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 338ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 339ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 340ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 3414e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 3429c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 3439c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy mPaddingLeft + mPaddingRight, lp.width); 344ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 345ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 346ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 347ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 3484e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 349ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 350ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3578e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3722d4cff64b4c864aa5f6859b73ffa65e31ee915acRomain Guy if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 4089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4109f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 4119f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 412352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollY = mScrollY; 4139f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 414352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell return !(y < child.getTop() - scrollY 415352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || y >= child.getBottom() - scrollY 4169f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 4179f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 4189f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4199f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 4209f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4219f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 42213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initOrResetVelocityTracker() { 42313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 42413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 42513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } else { 42613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.clear(); 42713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 43013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initVelocityTrackerIfNotExists() { 43113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 43213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 43313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 43613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void recycleVelocityTracker() { 43713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker != null) { 43813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.recycle(); 43913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = null; 44013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 44313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka @Override 44413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 44513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (disallowIntercept) { 44613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 44713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 44813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka super.requestDisallowInterceptTouchEvent(disallowIntercept); 44913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 45013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 45113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 4529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 4549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 4569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 4579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 4589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4700278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell /* 4710278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell * Don't try to intercept touch if we can't scroll anyway. 4720278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell */ 4730278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell if (getScrollY() == 0 && !canScrollVertically(1)) { 4740278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell return false; 4750278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell } 4760278c2fcbae9fccaddd1fca243218a34923417ecAdam Powell 477bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 478bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4889d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 4899d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 4909d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 4919d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 4929d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 4939d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 4949d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 4950dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (pointerIndex == -1) { 4960dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + activePointerId 4970dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren + " in onInterceptTouchEvent"); 4980dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 4990dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 5000dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 501df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(pointerIndex); 502df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int yDiff = Math.abs(y - mLastMotionY); 5039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (yDiff > mTouchSlop) { 5049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 505f7b4accbda1a4d98a5fadbf3984cb9666a4fe9e9Romain Guy mLastMotionY = y; 50613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 50713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 508ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan == null) { 509ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 510ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 511b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 512b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 513b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 514b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 517bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 519bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 520df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell final int y = (int) ev.getY(); 5214cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 5229f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mIsBeingDragged = false; 52313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 5249f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato break; 5259f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 5269f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 527bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /* 528bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Remember location of down touch. 529bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ACTION_DOWN always refers to pointer index 0. 530bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 5319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 532bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 53413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initOrResetVelocityTracker(); 53513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 5369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 5389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 5399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 5409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 542ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mIsBeingDragged && mScrollStrictSpan == null) { 543ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 544ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 5459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 546bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 5499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 5509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 5519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 552bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 55313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 554637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 555df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 556637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 557bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 558bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 559bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 5609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 5659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 5669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 5689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 5719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 57213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 5739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 5749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 5769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 577bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 578bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 579b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (getChildCount() == 0) { 580fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown return false; 581fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown } 582b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if ((mIsBeingDragged = !mScroller.isFinished())) { 583b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 584b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 585b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 586b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 587b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 5884e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 589352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 590352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 591352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 592352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 593352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 594352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 595ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 596ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 597ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 598ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 599352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 600352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 6019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 602df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(); 603bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 6049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 605bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 6069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 607b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 6080dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren if (activePointerIndex == -1) { 6090dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren Log.e(TAG, "Invalid pointerId=" + mActivePointerId + " in onTouchEvent"); 6100dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren break; 6110dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren } 6120dc291eef630cbc3c4479fff8c549567ac980f87Johan Rosengren 613b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final int y = (int) ev.getY(activePointerIndex); 614b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell int deltaY = mLastMotionY - y; 615b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (!mIsBeingDragged && Math.abs(deltaY) > mTouchSlop) { 616b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell final ViewParent parent = getParent(); 617b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (parent != null) { 618b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell parent.requestDisallowInterceptTouchEvent(true); 619b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 620b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell mIsBeingDragged = true; 621b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell if (deltaY > 0) { 622b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY -= mTouchSlop; 623b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } else { 624b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell deltaY += mTouchSlop; 625b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 626b3e02c44d57ac18d1debf21044289cf85d0dd672Adam Powell } 6279f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6289f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 6299f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mLastMotionY = y; 6309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 631637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldX = mScrollX; 632637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldY = mScrollY; 633637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int range = getScrollRange(); 634e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 635e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 636e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 637e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 638cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // Calling overScrollBy will call onOverScrolled, which 639cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette // calls onScrollChanged if applicable. 640f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (overScrollBy(0, deltaY, 0, mScrollY, 641e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 0, range, 0, mOverscrollDistance, true)) { 642637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Break our velocity if we hit a scroll barrier. 643637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mVelocityTracker.clear(); 644637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 645637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 646e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 647637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int pulledToY = oldY + deltaY; 648637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (pulledToY < 0) { 649637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onPull((float) deltaY / getHeight()); 650637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 651637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onRelease(); 652637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 653637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (pulledToY > range) { 654637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onPull((float) deltaY / getHeight()); 655637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 656637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onRelease(); 657637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 658637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 659637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null 660637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 661df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 662637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 663637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 6649f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 665bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 6664e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira case MotionEvent.ACTION_UP: 6679f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6689f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 6699f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 670bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 6719f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 672f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (getChildCount() > 0) { 673637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 674637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell fling(-initialVelocity); 675637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 676f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, 677f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell getScrollRange())) { 678df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 679637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 680637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 68117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 6829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 683bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 684ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 6859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 686bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 687352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 688352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 689637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 690df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 691637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 692352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 693ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 694352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 695352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 6969bc30d31322848d61f518c1db43544988faaba8fAdam Powell case MotionEvent.ACTION_POINTER_DOWN: { 6979bc30d31322848d61f518c1db43544988faaba8fAdam Powell final int index = ev.getActionIndex(); 698df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(index); 6999bc30d31322848d61f518c1db43544988faaba8fAdam Powell mActivePointerId = ev.getPointerId(index); 7009bc30d31322848d61f518c1db43544988faaba8fAdam Powell break; 7019bc30d31322848d61f518c1db43544988faaba8fAdam Powell } 702bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 703bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 704df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(ev.findPointerIndex(mActivePointerId)); 705bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 7069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 7089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7094e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 710bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 711bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 712bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 713bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 714bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 715bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 716bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 717bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 718bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 719df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell mLastMotionY = (int) ev.getY(newPointerIndex); 720bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 721bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 722bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 723bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 724bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 725bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 7264e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 727637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 72833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown public boolean onGenericMotionEvent(MotionEvent event) { 72933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 73033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown switch (event.getAction()) { 73133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown case MotionEvent.ACTION_SCROLL: { 73233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (!mIsBeingDragged) { 73333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 73433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (vscroll != 0) { 73533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int delta = (int) (vscroll * getVerticalScrollFactor()); 73633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int range = getScrollRange(); 73733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int oldScrollY = mScrollY; 73833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int newScrollY = oldScrollY - delta; 73933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY < 0) { 74033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = 0; 74133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } else if (newScrollY > range) { 74233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = range; 74333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY != oldScrollY) { 74533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown super.scrollTo(mScrollX, newScrollY); 74633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return true; 74733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 74933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 75033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 75133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 75233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 75333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return super.onGenericMotionEvent(event); 75433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 75533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown 75633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown @Override 757637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 758637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell boolean clampedX, boolean clampedY) { 759637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Treat animating scrolls differently; see #computeScroll() for why. 760637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mScroller.isFinished()) { 761cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldX = mScrollX; 762cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette final int oldY = mScrollY; 763637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollX = scrollX; 764637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollY = scrollY; 7650fd89bf7221431260883cee4597e2db942d799a0Romain Guy invalidateParentIfNeeded(); 766cb25bd8c2b41fad0f65114c42d8f6e732645dd96Alan Viverette onScrollChanged(mScrollX, mScrollY, oldX, oldY); 767637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (clampedY) { 768637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 769637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 770637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 771637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.scrollTo(scrollX, scrollY); 772637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 773e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy 774e72cf7341a608402309ce894fc12d050cc7c0e14Romain Guy awakenScrollBars(); 775637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 776637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 777a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 778a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov public boolean performAccessibilityAction(int action, Bundle arguments) { 77948d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov if (super.performAccessibilityAction(action, arguments)) { 78048d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return true; 78148d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov } 782fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (!isEnabled()) { 783fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov return false; 784fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 785a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov switch (action) { 786a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_FORWARD: { 787a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 788a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.min(mScrollY + viewportHeight, getScrollRange()); 789a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 790a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 791a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 792a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 793a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 794a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov case AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD: { 795a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int viewportHeight = getHeight() - mPaddingBottom - mPaddingTop; 796a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov final int targetScrollY = Math.max(mScrollY - viewportHeight, 0); 797a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov if (targetScrollY != mScrollY) { 798a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov smoothScrollTo(0, targetScrollY); 799a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov return true; 800a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 801a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } return false; 802a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 80348d1586f4065fc9ab97a679da1e4f7c327c943f2Svetoslav Ganov return false; 804a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 805a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov 806a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov @Override 807a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 808a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityNodeInfo(info); 8098a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov info.setClassName(ScrollView.class.getName()); 810fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (isEnabled()) { 811fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov final int scrollRange = getScrollRange(); 812fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (scrollRange > 0) { 813fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.setScrollable(true); 814fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY > 0) { 815fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_BACKWARD); 816fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 817fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov if (mScrollY < scrollRange) { 818fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov info.addAction(AccessibilityNodeInfo.ACTION_SCROLL_FORWARD); 819fb1e80a247221ee7e8f5c5deba04812021d9d07eSvetoslav Ganov } 820a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 821a1dc761c8322355eb1bb71d3d6c9c603c1d1fc0fSvetoslav Ganov } 822a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 823a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 824a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 825a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 826a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityEvent(event); 8278a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov event.setClassName(ScrollView.class.getName()); 828d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov final boolean scrollable = getScrollRange() > 0; 829d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollable(scrollable); 830d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollX(mScrollX); 831d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollY(mScrollY); 832d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollX(mScrollX); 833d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollY(getScrollRange()); 834a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 835a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 836637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int getScrollRange() { 837637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = 0; 838637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (getChildCount() > 0) { 839637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell View child = getChildAt(0); 840637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange = Math.max(0, 841637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell child.getHeight() - (getHeight() - mPaddingBottom - mPaddingTop)); 842637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 843637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 844637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 845637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 8559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 8569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 8609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 9885435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson mTempRect.bottom = view.getBottom() + mPaddingBottom; 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 9949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 10002ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * the new visible area, the focus is reclaimed by this ScrollView.</p> 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 10032ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10282ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (newFocused != findFocus()) newFocused.requestFocus(direction); 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 10449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10497d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 1062ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1063ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 10645435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson int screenBottom = getScrollY() + getHeight() - mPaddingBottom; 1065ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 1066ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 1067ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 10967d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 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 within delta 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11037d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 11087d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 11333fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 11343fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 11353fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 11363fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 1139f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 1140f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 1141f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 1142f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 1143f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 1144f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 1145f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 1146df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 11499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 1150ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1151ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1152ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1153ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 1176a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 1177a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 11780b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 1179a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 11800b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11814e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1182637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = getChildAt(0).getBottom(); 1183637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1184637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 1185637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (scrollY < 0) { 1186637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange -= scrollY; 1187637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (scrollY > overscrollBottom) { 1188637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange += scrollY - overscrollBottom; 1189637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1190637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1191637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 11929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11940b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 11950b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 11960b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 11970b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 125117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 1252637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (oldX != x || oldY != y) { 1253e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int range = getScrollRange(); 1254e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 1255e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 1256e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 1257e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1258e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio overScrollBy(x - oldX, y - oldY, oldX, oldY, 0, range, 1259637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 0, mOverflingDistance, false); 1260637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 1261637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1262e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 1263637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (y < 0 && oldY >= 0) { 1264637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 1265637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (y > range && oldY <= range) { 1266637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 1267637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 12689d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell } 12699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1270e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1271e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy if (!awakenScrollBars()) { 1272e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy // Keep on drawing until the animation has finished. 1273df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1274e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy } 1275ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } else { 1276ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1277ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1278ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1279ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 12879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 12899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 12909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 12929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 12939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 12979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 12989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 13039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 13049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 13149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 13159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1331ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 13479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 13579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 13589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 13599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 13619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 13629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1365ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 13669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 13679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 13689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 13739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 13759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 13769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 13779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 13789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 13799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 13809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 13839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 13849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 13869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 13902ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (!mIsLayoutDirty) { 13912ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne scrollToChild(focused); 13922ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne } else { 13932ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne // The child may not be laid out yet, we can't compute the scroll yet 13942ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne mChildToScrollTo = focused; 13959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 13979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 14019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 14029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 14039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 14059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 14069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 14099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 14109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 14129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 14139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 14149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 14159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 14169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 14179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 14209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 14219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 14229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 14239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 14259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 14299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 14309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 14334e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 14349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 14379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 14389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 14399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 14409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 14419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 14439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 14479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 14489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 14499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1452ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick protected void onDetachedFromWindow() { 1453ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick super.onDetachedFromWindow(); 1454ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1455ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1456ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1457ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1458ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1459ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1460ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1461ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1462ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1463ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1464ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1465ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick @Override 14669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 14679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 14689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 14694e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira // Give a child focus if it needs it 14709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 14719c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy scrollToChild(mChildToScrollTo); 14729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 14749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1475d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio if (!hasLayout()) { 1476d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio if (mSavedState != null) { 1477d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = mSavedState.scrollPosition; 1478d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mSavedState = null; 1479d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } // mScrollY default value is "0" 1480d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio 1481d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio final int childHeight = (getChildCount() > 0) ? getChildAt(0).getMeasuredHeight() : 0; 1482d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio final int scrollRange = Math.max(0, 1483d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio childHeight - (b - t - mPaddingBottom - mPaddingTop)); 1484d6d543977da14adb3ef9322a0b7ec3fdd027a55eFabrice Di Meglio 1485d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio // Don't forget to clamp 1486d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio if (mScrollY > scrollRange) { 1487d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = scrollRange; 1488d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } else if (mScrollY < 0) { 1489d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mScrollY = 0; 1490d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1491d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1492d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1493f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa // Calling this with the present values causes it to re-claim them 14949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 14959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 14989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 14999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 15009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 15029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 15039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 15049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15057d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 15067d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 15077d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 15087d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 15099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 15109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 15119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 15129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 15139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15144e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 15159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1517f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa * Return true if child is a descendant of parent, (or equal to the parent). 15189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1519e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static boolean isViewDescendantOf(View child, View parent) { 15209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 15219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 15229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 15259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 15264e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 15279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 15289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 15309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 153252964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * numbers mean that the finger/cursor is moving down the screen, 15339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 15349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1536ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1537ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1538ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 15394e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 15404e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 1541637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell Math.max(0, bottom - height), 0, height/2); 15424e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1543ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan == null) { 1544ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = StrictMode.enterCriticalSpan("ScrollView-fling"); 1545ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1546ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1547df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 15489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1551ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private void endDrag() { 1552ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mIsBeingDragged = false; 1553ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 155413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 1555ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1556ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mEdgeGlowTop != null) { 1557ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowTop.onRelease(); 1558ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowBottom.onRelease(); 1559ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1560ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1561ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1562ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1563ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1564ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1565ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1566ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 15679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 15689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 15699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 15719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 157252964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne @Override 15739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 15749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 15759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 15769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 15779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 15789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 15799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 15809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 15819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1582637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1583637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1584637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1585637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1586637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void setOverScrollMode(int mode) { 1587637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mode != OVER_SCROLL_NEVER) { 1588637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop == null) { 15894e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira Context context = getContext(); 159089935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowTop = new EdgeEffect(context); 159189935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowBottom = new EdgeEffect(context); 1592637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1593637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 1594637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop = null; 1595637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom = null; 1596637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1597637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.setOverScrollMode(mode); 1598637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1599637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1600637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1601637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void draw(Canvas canvas) { 1602637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.draw(canvas); 1603637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null) { 1604637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1605637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 1606637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 16077d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1608637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 16097d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(mPaddingLeft, Math.min(0, scrollY)); 1610b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowTop.setSize(width, getHeight()); 1611637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop.draw(canvas)) { 1612df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1613637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1614637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1615637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1616637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 1617637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 16187d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1619637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int height = getHeight(); 1620637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 16217d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(-width + mPaddingLeft, 16227d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell Math.max(getScrollRange(), scrollY) + height); 1623637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.rotate(180, width, 0); 1624b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowBottom.setSize(width, height); 1625637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 1626df3ae4f3aea3bdce6bb54133c8a07a26bf207c3cAdam Powell postInvalidateOnAnimation(); 1627637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1628637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1629637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 16309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1633e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static int clamp(int n, int my, int child) { 16349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 16359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 16369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 16399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 16429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 16439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 16459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 16469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 16479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 16489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 16499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 16509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 16519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 16539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 16549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 16559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 16569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 16579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 16589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 16599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 16609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 16619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1662d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1663d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1664d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio protected void onRestoreInstanceState(Parcelable state) { 1665d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState ss = (SavedState) state; 1666d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super.onRestoreInstanceState(ss.getSuperState()); 1667d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio mSavedState = ss; 1668d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio requestLayout(); 1669d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1670d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1671d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1672d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio protected Parcelable onSaveInstanceState() { 1673d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio Parcelable superState = super.onSaveInstanceState(); 1674d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState ss = new SavedState(superState); 1675d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio ss.scrollPosition = mScrollY; 1676d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return ss; 1677d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1678d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1679d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio static class SavedState extends BaseSavedState { 1680d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public int scrollPosition; 1681d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1682d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio SavedState(Parcelable superState) { 1683d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super(superState); 1684d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1685d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1686d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState(Parcel source) { 1687d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super(source); 1688d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio scrollPosition = source.readInt(); 1689d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1690d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1691d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1692d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public void writeToParcel(Parcel dest, int flags) { 1693d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio super.writeToParcel(dest, flags); 1694d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio dest.writeInt(scrollPosition); 1695d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1696d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1697d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio @Override 1698d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public String toString() { 1699d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return "HorizontalScrollView.SavedState{" 1700d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio + Integer.toHexString(System.identityHashCode(this)) 1701d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio + " scrollPosition=" + scrollPosition + "}"; 1702d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1703d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1704d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public static final Parcelable.Creator<SavedState> CREATOR 1705d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio = new Parcelable.Creator<SavedState>() { 1706d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState createFromParcel(Parcel in) { 1707d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return new SavedState(in); 1708d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1709d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 1710d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio public SavedState[] newArray(int size) { 1711d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio return new SavedState[size]; 1712d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1713d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio }; 1714d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio } 1715d6befbdd17f528d87e313b3665b248b670f8615cFabrice Di Meglio 17169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1717