ScrollView.java revision e72cf7341a608402309ce894fc12d050cc7c0e14
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1917dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powellimport com.android.internal.R; 2017dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 23637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powellimport android.graphics.Canvas; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 25ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrickimport android.os.StrictMode; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 2833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brownimport android.view.InputDevice; 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 342ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunneimport android.view.ViewDebug; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 37a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityEvent; 38a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganovimport android.view.accessibility.AccessibilityNodeInfo; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 564e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>ScrollView only supports vertical scrolling. 58fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * 59fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 69637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private OverScroller mScroller; 7089935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowTop; 7189935e41c593a599e8955388b27fb926e60e5e94Adam Powell private EdgeEffect mEdgeGlowBottom; 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mLastMotionY; 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 107a174d7a0d5475dbae2b48f7359abf1637a882896Romain Guy @ViewDebug.ExportedProperty(category = "layout") 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1164296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1174296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 1184e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 119637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverscrollDistance; 120637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int mOverflingDistance; 121637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 122bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 123bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 124bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 125bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 126bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 127ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 128ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick /** 129ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * The StrictMode "critical time span" objects to catch animation 130ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * stutters. Non-null when a time-sensitive animation is 131ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * in-flight. Must call finish() on them when done animating. 132ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick * These are no-ops on user builds. 133ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick */ 134ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mScrollStrictSpan = null; // aka "drag" 135ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private StrictMode.Span mFlingStrictSpan = null; 136ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 137bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 138bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 139bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 140bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 141bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs, int defStyle) { 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.ScrollView, defStyle, 0); 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 164e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy public boolean shouldDelayChildPressedState() { 165e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy return true; 166e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy } 167e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy 168e0a799a2ac1ca78e30fbac9e4e12a063425c08d3Patrick Dubroy @Override 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 208637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller = new OverScroller(getContext()); 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 2124296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 2134296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 2144296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 2154296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 216637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverscrollDistance = configuration.getScaledOverscrollDistance(); 217637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mOverflingDistance = configuration.getScaledOverflingDistance(); 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2724e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 273fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2854e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira * 286fdbf484be1eca388553d97a13a9500b98b18b474Romain Guy * @attr ref android.R.styleable#ScrollView_fillViewport 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 323ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 324ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 325ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 326ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 327ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 3284e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 3299c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, 3309c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy mPaddingLeft + mPaddingRight, lp.width); 331ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 332ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 333ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 334ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 3354e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 336ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 337ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3448e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3592d4cff64b4c864aa5f6859b73ffa65e31ee915acRomain Guy if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 3829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 3849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 3869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3979f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 3989f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 399352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollY = mScrollY; 4009f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 401352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell return !(y < child.getTop() - scrollY 402352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || y >= child.getBottom() - scrollY 4039f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 4049f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 4059f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4069f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 4079f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4089f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 40913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initOrResetVelocityTracker() { 41013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 41113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 41213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } else { 41313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.clear(); 41413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 41513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 41613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 41713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void initVelocityTrackerIfNotExists() { 41813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker == null) { 41913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = VelocityTracker.obtain(); 42013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 42313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka private void recycleVelocityTracker() { 42413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (mVelocityTracker != null) { 42513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.recycle(); 42613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker = null; 42713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 42913451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 43013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka @Override 43113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 43213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka if (disallowIntercept) { 43313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 43413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka super.requestDisallowInterceptTouchEvent(disallowIntercept); 43613451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka } 43713451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 43813451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka 4399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 4419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 4439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 4449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 4459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 4499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 457bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 458bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4689d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 4699d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 4709d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 4719d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 4729d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 4739d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 4749d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 475bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(pointerIndex); 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int yDiff = (int) Math.abs(y - mLastMotionY); 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (yDiff > mTouchSlop) { 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 479f7b4accbda1a4d98a5fadbf3984cb9666a4fe9e9Romain Guy mLastMotionY = y; 48013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 48113451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 482ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan == null) { 483ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 484ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 4859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 487bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 4889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 489bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 490bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(); 4914cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 4929f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mIsBeingDragged = false; 49313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 4949f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato break; 4959f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4969f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 497bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /* 498bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Remember location of down touch. 499bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ACTION_DOWN always refers to pointer index 0. 500bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 5019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 502bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 50413451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initOrResetVelocityTracker(); 50513451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka mVelocityTracker.addMovement(ev); 5069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 5089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 5099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 5109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 512ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mIsBeingDragged && mScrollStrictSpan == null) { 513ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll"); 514ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 5159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 516bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 5199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 5209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 5219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 522bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 52313451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 524637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 525637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell invalidate(); 526637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 527bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 528bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 529bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 5309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 5359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 5369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 5389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 5419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 54213451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka initVelocityTrackerIfNotExists(); 5439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 5449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 5469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 547bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 548bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 549fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown mIsBeingDragged = getChildCount() != 0; 550fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown if (!mIsBeingDragged) { 551fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown return false; 552fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown } 5534e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 554352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 555352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 556352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 557352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 558352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 559352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 560ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 561ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 562ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 563ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 564352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 565352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 5669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 567fb75738ee28839c67bef4abc15d6c7a407c34f55Jeff Brown mLastMotionY = ev.getY(); 568bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 570bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 5729f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 5739f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 574bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 575bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(activePointerIndex); 5769f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final int deltaY = (int) (mLastMotionY - y); 5779f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mLastMotionY = y; 5789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 579637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldX = mScrollX; 580637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int oldY = mScrollY; 581637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int range = getScrollRange(); 582e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 583e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 584e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 585e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 586f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (overScrollBy(0, deltaY, 0, mScrollY, 587e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 0, range, 0, mOverscrollDistance, true)) { 588637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Break our velocity if we hit a scroll barrier. 589637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mVelocityTracker.clear(); 590637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 591637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 592637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 593e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 594637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int pulledToY = oldY + deltaY; 595637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (pulledToY < 0) { 596637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onPull((float) deltaY / getHeight()); 597637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 598637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onRelease(); 599637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 600637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (pulledToY > range) { 601637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onPull((float) deltaY / getHeight()); 602637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 603637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onRelease(); 604637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 605637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 606637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null 607637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 608637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell invalidate(); 609637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 610637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 6119f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 612bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 6134e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira case MotionEvent.ACTION_UP: 6149f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 6159f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 6169f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 617bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 6189f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 619f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (getChildCount() > 0) { 620637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 621637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell fling(-initialVelocity); 622637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 623f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, 624f6a6c97062d905be267fcb8f70e6eb06fb7e5ab4Adam Powell getScrollRange())) { 625637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell invalidate(); 626637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 627637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 62817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 6299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 630bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 631ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 6329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 633bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 634352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 635352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 636637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 637637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell invalidate(); 638637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 639352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 640ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick endDrag(); 641352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 642352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 6439bc30d31322848d61f518c1db43544988faaba8fAdam Powell case MotionEvent.ACTION_POINTER_DOWN: { 6449bc30d31322848d61f518c1db43544988faaba8fAdam Powell final int index = ev.getActionIndex(); 645e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy mLastMotionY = ev.getY(index); 6469bc30d31322848d61f518c1db43544988faaba8fAdam Powell mActivePointerId = ev.getPointerId(index); 6479bc30d31322848d61f518c1db43544988faaba8fAdam Powell break; 6489bc30d31322848d61f518c1db43544988faaba8fAdam Powell } 649bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 650bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 6519bc30d31322848d61f518c1db43544988faaba8fAdam Powell mLastMotionY = ev.getY(ev.findPointerIndex(mActivePointerId)); 652bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 6539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 6559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6564e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 657bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 658bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 659bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 660bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 661bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 662bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 663bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 664bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 665bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 666bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mLastMotionY = ev.getY(newPointerIndex); 667bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 668bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 669bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 670bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 671bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 672bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 6734e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 674637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 67533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown public boolean onGenericMotionEvent(MotionEvent event) { 67633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 67733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown switch (event.getAction()) { 67833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown case MotionEvent.ACTION_SCROLL: { 67933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (!mIsBeingDragged) { 68033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final float vscroll = event.getAxisValue(MotionEvent.AXIS_VSCROLL); 68133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (vscroll != 0) { 68233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int delta = (int) (vscroll * getVerticalScrollFactor()); 68333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown final int range = getScrollRange(); 68433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int oldScrollY = mScrollY; 68533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown int newScrollY = oldScrollY - delta; 68633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY < 0) { 68733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = 0; 68833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } else if (newScrollY > range) { 68933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown newScrollY = range; 69033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 69133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown if (newScrollY != oldScrollY) { 69233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown super.scrollTo(mScrollX, newScrollY); 69333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return true; 69433bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 69533bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 69633bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 69733bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 69833bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 69933bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 70033bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown return super.onGenericMotionEvent(event); 70133bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown } 70233bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown 70333bbfd2232ea9eaae9a9d87a05a95a430f09bd83Jeff Brown @Override 704637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 705637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell boolean clampedX, boolean clampedY) { 706637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell // Treat animating scrolls differently; see #computeScroll() for why. 707637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mScroller.isFinished()) { 708637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollX = scrollX; 709637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScrollY = scrollY; 7100fd89bf7221431260883cee4597e2db942d799a0Romain Guy invalidateParentIfNeeded(); 711637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (clampedY) { 712637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 713637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 714637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 715637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.scrollTo(scrollX, scrollY); 716637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 717e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy 718e72cf7341a608402309ce894fc12d050cc7c0e14Romain Guy awakenScrollBars(); 719637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 720637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 721a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 722a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 723a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityNodeInfo(info); 7248a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov info.setClassName(ScrollView.class.getName()); 725d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov info.setScrollable(getScrollRange() > 0); 726a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 727a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 728a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov @Override 729a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 730a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov super.onInitializeAccessibilityEvent(event); 7318a78fd4d9572dff95432fcc4ba0e87563415b728Svetoslav Ganov event.setClassName(ScrollView.class.getName()); 732d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov final boolean scrollable = getScrollRange() > 0; 733d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollable(scrollable); 734d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollX(mScrollX); 735d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setScrollY(mScrollY); 736d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollX(mScrollX); 737d9ee72fddb8be40e414a831fb80458dc48699613Svetoslav Ganov event.setMaxScrollY(getScrollRange()); 738a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov } 739a0156177cdc809795dd8bc5a19943dd2b6f82b66Svetoslav Ganov 740637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell private int getScrollRange() { 741637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = 0; 742637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (getChildCount() > 0) { 743637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell View child = getChildAt(0); 744637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange = Math.max(0, 745637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell child.getHeight() - (getHeight() - mPaddingBottom - mPaddingTop)); 746637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 747637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 748637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 749637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 7509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 7529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 7539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 7549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 7569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 7579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 7589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 7599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 7609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 7619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 7629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 7639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 7649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 7669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 7689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 7699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 7729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 7739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 7749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 7759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 7769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 7789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 7809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 7819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 7829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 7839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 7849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 7869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 7889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 7899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 7929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 7939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 7959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 7969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 7989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 8009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 8019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 8029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 8039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 8059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 8069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 8089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 8099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 8109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 8129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 8159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 8169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 8179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 8189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 8199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 8209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 8219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 8229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 8249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 8319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 8359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 8369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 8379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 8389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 8399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 8419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 8559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 8569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 8609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 8619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 8925435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson mTempRect.bottom = view.getBottom() + mPaddingBottom; 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 9042ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * the new visible area, the focus is reclaimed by this ScrollView.</p> 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 9072ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne * to go upward, {@link android.view.View#FOCUS_DOWN} to downward 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9322ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (newFocused != findFocus()) newFocused.requestFocus(direction); 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9537d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 966ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 967ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 9685435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson int screenBottom = getScrollY() + getHeight() - mPaddingBottom; 969ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 970ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 971ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 9849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 10007d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10077d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 10127d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 10373fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 10383fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 10393fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 10403fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 1043f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 1044f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 1045f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 1046f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 1047f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 1048f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 1049f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project invalidate(); 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 1054ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1055ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1056ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1057ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 1080a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 1081a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 10820b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 1083a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 10840b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 10854e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1086637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell int scrollRange = getChildAt(0).getBottom(); 1087637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1088637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 1089637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (scrollY < 0) { 1090637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange -= scrollY; 1091637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (scrollY > overscrollBottom) { 1092637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell scrollRange += scrollY - overscrollBottom; 1093637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1094637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1095637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell return scrollRange; 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 10990b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 11000b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 11010b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 11089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 11429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 11499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 115517dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 1156637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (oldX != x || oldY != y) { 1157e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int range = getScrollRange(); 1158e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final int overscrollMode = getOverScrollMode(); 1159e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio final boolean canOverscroll = overscrollMode == OVER_SCROLL_ALWAYS || 1160e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0); 1161e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1162e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio overScrollBy(x - oldX, y - oldY, oldX, oldY, 0, range, 1163637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 0, mOverflingDistance, false); 1164637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 1165637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1166e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio if (canOverscroll) { 1167637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (y < 0 && oldY >= 0) { 1168637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 1169637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else if (y > range && oldY <= range) { 1170637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 1171637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 11729d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell } 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1174e9dbef85d36ce4030dae29af0d80db8d6fd0b972Fabrice Di Meglio 1175e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy if (!awakenScrollBars()) { 1176e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy // Keep on drawing until the animation has finished. 1177e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy invalidate(); 1178e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy } 1179ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } else { 1180ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1181ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1182ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1183ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 11919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 11969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 11979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1235ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 12569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 12579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 12589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 12599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 12619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 12629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 12639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 12649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 12669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1269ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 12709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 12719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 12729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 12749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 12759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 12769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 12779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 12799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 12839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 12849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 12879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 12889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 12909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 12942ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne if (!mIsLayoutDirty) { 12952ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne scrollToChild(focused); 12962ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne } else { 12972ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne // The child may not be laid out yet, we can't compute the scroll yet 12982ed2eacd7e0569675410f1e62238b708c5dcc8acGilles Debunne mChildToScrollTo = focused; 12999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 13149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 13169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 13374e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 13479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1356ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick protected void onDetachedFromWindow() { 1357ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick super.onDetachedFromWindow(); 1358ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1359ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1360ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1361ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1362ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1363ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan != null) { 1364ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan.finish(); 1365ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = null; 1366ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1367ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1368ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1369ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick @Override 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 13734e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira // Give a child focus if it needs it 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 13759c9573721140c260d4614c7ac58923dcfa0cea22Romain Guy scrollToChild(mChildToScrollTo); 13769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 13789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1379f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa // Calling this with the present values causes it to re-claim them 13809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 13819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 13859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 13869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 13889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 13899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 13909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13917d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 13927d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 13937d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 13947d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 13959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 13969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 13979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 13989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 13999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14004e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 14019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1403f76a50ce8fdc6aea22cabc77b2977a1a15a79630Ken Wakasa * Return true if child is a descendant of parent, (or equal to the parent). 14049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1405e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static boolean isViewDescendantOf(View child, View parent) { 14069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 14079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 14089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 14119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 14124e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira } 14139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 14159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 14169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 141852964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * numbers mean that the finger/cursor is moving down the screen, 14199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 14209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1422ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1423ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1424ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 14254e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 14264e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 1427637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell Math.max(0, bottom - height), 0, height/2); 14284e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira 1429ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mFlingStrictSpan == null) { 1430ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mFlingStrictSpan = StrictMode.enterCriticalSpan("ScrollView-fling"); 1431ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1432ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1433ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy invalidate(); 14349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1437ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick private void endDrag() { 1438ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mIsBeingDragged = false; 1439ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 144013451a476a1951a19d3cb531c47bf5a51587800aMichael Jurka recycleVelocityTracker(); 1441ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1442ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mEdgeGlowTop != null) { 1443ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowTop.onRelease(); 1444ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mEdgeGlowBottom.onRelease(); 1445ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1446ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 1447ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick if (mScrollStrictSpan != null) { 1448ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan.finish(); 1449ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick mScrollStrictSpan = null; 1450ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1451ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick } 1452ce81f3a955a0e77e44e1f76c976905ec2a52c1d0Brad Fitzpatrick 14539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 14549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 14559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 14579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 145852964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne @Override 14599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 14609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 14619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 14629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 14639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 14649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 14659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 14669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 14679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1468637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1469637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1470637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1471637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1472637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void setOverScrollMode(int mode) { 1473637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mode != OVER_SCROLL_NEVER) { 1474637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop == null) { 14754e30d89ceda832300f80bf73f4f58cd2b51bf112Mindy Pereira Context context = getContext(); 147689935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowTop = new EdgeEffect(context); 147789935e41c593a599e8955388b27fb926e60e5e94Adam Powell mEdgeGlowBottom = new EdgeEffect(context); 1478637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1479637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } else { 1480637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowTop = null; 1481637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell mEdgeGlowBottom = null; 1482637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1483637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.setOverScrollMode(mode); 1484637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1485637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 1486637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell @Override 1487637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell public void draw(Canvas canvas) { 1488637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell super.draw(canvas); 1489637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop != null) { 1490637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int scrollY = mScrollY; 1491637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowTop.isFinished()) { 1492637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 14937d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1494637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 14957d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(mPaddingLeft, Math.min(0, scrollY)); 1496b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowTop.setSize(width, getHeight()); 1497637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowTop.draw(canvas)) { 1498637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell invalidate(); 1499637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1500637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1501637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1502637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (!mEdgeGlowBottom.isFinished()) { 1503637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int restoreCount = canvas.save(); 15047d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell final int width = getWidth() - mPaddingLeft - mPaddingRight; 1505637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell final int height = getHeight(); 1506637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell 15077d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell canvas.translate(-width + mPaddingLeft, 15087d86378b0c3a02499a5a9aab35851424ffa57bd8Adam Powell Math.max(getScrollRange(), scrollY) + height); 1509637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.rotate(180, width, 0); 1510b1297f76351795822c64236c4ce27b97d18e5bcaMindy Pereira mEdgeGlowBottom.setSize(width, height); 1511637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell if (mEdgeGlowBottom.draw(canvas)) { 1512637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell invalidate(); 1513637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 1514637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell canvas.restoreToCount(restoreCount); 1515637d337b58d8eec6de19230a5dd5ca5581c0478dAdam Powell } 15169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1519e979e62ac7313b7cffe9b131bb8a99c356068b45Romain Guy private static int clamp(int n, int my, int child) { 15209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 15219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 15229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 15239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 15249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 15259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 15269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 15279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 15289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 15299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 15309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 15319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 15329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 15339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 15349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 15359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 15379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 15399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 15409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 15419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 15429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 15439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 15449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 15459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 15479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 15489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1549