ScrollView.java revision 5435a06010fb50dd8b495df6b7f21f15d82a2c0a
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; 220a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powellimport android.content.res.Resources; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 240a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powellimport android.graphics.Canvas; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 260a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powellimport android.graphics.drawable.Drawable; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 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; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>ScrollView only supports vertical scrolling. 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 650a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell private OverScroller mScroller; 660a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell private EdgeGlow mEdgeGlowTop; 670a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell private EdgeGlow mEdgeGlowBottom; 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Flag to indicate that we are moving focus ourselves. This is so the 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * code that watches for focus changes initiated outside this ScrollView 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * knows that it does not have to do anything. 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mScrollViewMovedFocus; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mLastMotionY; 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1184296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1194296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 120bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 1210a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell private int mOverscrollDistance; 1220a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell private int mOverflingDistance; 1230a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 124bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 125bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 126bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 127bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 128bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 129bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 130bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 131bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 132bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 133bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 134bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs, int defStyle) { 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.ScrollView, defStyle, 0); 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 1960a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mScroller = new OverScroller(getContext()); 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 2004296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 2014296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 2024296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 2034296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 2040a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mOverscrollDistance = configuration.getScaledOverscrollDistance(); 2050a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mOverflingDistance = configuration.getScaledOverflingDistance(); 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 307ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 308ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 309ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 310ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 311ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 312ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 313ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, mPaddingLeft 314ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy + mPaddingRight, lp.width); 315ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 316ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 317ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 318ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 319ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 320ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 321ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3288e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3432d4cff64b4c864aa5f6859b73ffa65e31ee915acRomain Guy if (isFocused() && event.getKeyCode() != KeyEvent.KEYCODE_BACK) { 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3819f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 3829f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 383352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollY = mScrollY; 3849f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 385352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell return !(y < child.getTop() - scrollY 386352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || y >= child.getBottom() - scrollY 3879f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 3889f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 3899f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 3909f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 3919f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 3929f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 411bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 412bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4229d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 4239d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 4249d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 4259d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 4269d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 4279d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 4289d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 429bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(pointerIndex); 4309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int yDiff = (int) Math.abs(y - mLastMotionY); 4319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (yDiff > mTouchSlop) { 4329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 433f7b4accbda1a4d98a5fadbf3984cb9666a4fe9e9Romain Guy mLastMotionY = y; 4349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 436bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 4379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 438bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 439bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(); 4404cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 4419f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mIsBeingDragged = false; 4429f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato break; 4439f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4449f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 445bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /* 446bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Remember location of down touch. 447bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ACTION_DOWN always refers to pointer index 0. 448bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 4499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 450bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 4519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 4549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 4559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 4569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 4589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 459bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 4609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 465bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 466737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 4670a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell invalidate(); 4680a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 469bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 470bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 471bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 4729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 4849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { 4869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Don't handle edge touches immediately -- they may actually belong to one of our 4879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // descendants. 4889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 4899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mVelocityTracker == null) { 4929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker = VelocityTracker.obtain(); 4939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 4959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 498bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 499bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 50039bc6197baa7482dd070878a63992e8212965a4dJeff Brown mIsBeingDragged = getChildCount() != 0; 50139bc6197baa7482dd070878a63992e8212965a4dJeff Brown if (!mIsBeingDragged) { 50239bc6197baa7482dd070878a63992e8212965a4dJeff Brown return false; 50339bc6197baa7482dd070878a63992e8212965a4dJeff Brown } 50439bc6197baa7482dd070878a63992e8212965a4dJeff Brown 505352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 506352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 507352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 508352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 509352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 510352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 511352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 512352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 5139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 51439bc6197baa7482dd070878a63992e8212965a4dJeff Brown mLastMotionY = ev.getY(); 515bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 517bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 5199f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 5209f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 521bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 522bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(activePointerIndex); 5239f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final int deltaY = (int) (mLastMotionY - y); 5249f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mLastMotionY = y; 5259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5260a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int oldX = mScrollX; 5270a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int oldY = mScrollY; 5280a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int range = getScrollRange(); 529737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell if (overScrollBy(0, deltaY, 0, mScrollY, 0, range, 5300a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 0, mOverscrollDistance, true)) { 5310a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell // Break our velocity if we hit a scroll barrier. 5320a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mVelocityTracker.clear(); 5330a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 5340a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 5350a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 536737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell final int overscrollMode = getOverScrollMode(); 537737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell if (overscrollMode == OVER_SCROLL_ALWAYS || 538737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0)) { 539e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell final int pulledToY = oldY + deltaY; 540e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell if (pulledToY < 0) { 541e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell mEdgeGlowTop.onPull((float) deltaY / getHeight()); 5424de94de9c5ad18e1162fa30dd1149211485297c0Mindy Pereira if (!mEdgeGlowBottom.isFinished()) { 5434de94de9c5ad18e1162fa30dd1149211485297c0Mindy Pereira mEdgeGlowBottom.onRelease(); 5444de94de9c5ad18e1162fa30dd1149211485297c0Mindy Pereira } 545e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell } else if (pulledToY > range) { 546e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell mEdgeGlowBottom.onPull((float) deltaY / getHeight()); 5474de94de9c5ad18e1162fa30dd1149211485297c0Mindy Pereira if (!mEdgeGlowTop.isFinished()) { 5484de94de9c5ad18e1162fa30dd1149211485297c0Mindy Pereira mEdgeGlowTop.onRelease(); 5494de94de9c5ad18e1162fa30dd1149211485297c0Mindy Pereira } 550e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell } 5516fbc5d9c19388e8f1c9a1833bc0e15fcf6b499f1Mindy Pereira if (mEdgeGlowTop != null 5526fbc5d9c19388e8f1c9a1833bc0e15fcf6b499f1Mindy Pereira && (!mEdgeGlowTop.isFinished() || !mEdgeGlowBottom.isFinished())) { 5536fbc5d9c19388e8f1c9a1833bc0e15fcf6b499f1Mindy Pereira invalidate(); 5546fbc5d9c19388e8f1c9a1833bc0e15fcf6b499f1Mindy Pereira } 5550a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 5569f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 557bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 558bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_UP: 5599f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 5609f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 5619f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 562bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 5639f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 5640a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (getChildCount() > 0) { 5650a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 5660a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell fling(-initialVelocity); 5670a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } else { 5680a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int bottom = getScrollRange(); 569737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, bottom)) { 5700a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell invalidate(); 5710a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 5720a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 57317dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 5749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 575bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 576bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mIsBeingDragged = false; 577bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 5789f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mVelocityTracker != null) { 5799f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mVelocityTracker.recycle(); 5809f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mVelocityTracker = null; 5819f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 5820a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (mEdgeGlowTop != null) { 5830a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowTop.onRelease(); 5840a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowBottom.onRelease(); 5850a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 5869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 587bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 588352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 589352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 590737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 5910a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell invalidate(); 5920a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 593352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 594352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mIsBeingDragged = false; 595352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mVelocityTracker != null) { 596352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mVelocityTracker.recycle(); 597352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mVelocityTracker = null; 598352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 5990a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (mEdgeGlowTop != null) { 6000a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowTop.onRelease(); 6010a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowBottom.onRelease(); 6020a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 603352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 604352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 605bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 606bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 607bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 6089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 6109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6110b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 612bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 613bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 614bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 615bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 616bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 617bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 618bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 619bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 620bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 621bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mLastMotionY = ev.getY(newPointerIndex); 622bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 623bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 624bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 625bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 626bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 627bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 628bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 6290a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell @Override 630737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell protected void onOverScrolled(int scrollX, int scrollY, 6310a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell boolean clampedX, boolean clampedY) { 6320a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell // Treat animating scrolls differently; see #computeScroll() for why. 6330a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (!mScroller.isFinished()) { 6340a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mScrollX = scrollX; 6350a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mScrollY = scrollY; 6360a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (clampedY) { 637737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 6380a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 6390a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } else { 6400a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell super.scrollTo(scrollX, scrollY); 6410a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 6420a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell awakenScrollBars(); 6430a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 6440a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 6450b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getScrollRange() { 6460b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = 0; 6470b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (getChildCount() > 0) { 6480b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell View child = getChildAt(0); 6490b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange = Math.max(0, 65062a744e17d32fed0208ad874392e68adc71b601eAdam Powell child.getHeight() - (getHeight() - mPaddingBottom - mPaddingTop)); 6510b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6520b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 6530b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in this View's bounds 6589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (excluding fading edges) pretending that this View's top is located at 6599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the parameter top. 6609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 6639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 6649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 6659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 6669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found (the fading edge is assumed to start at this position) 6679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param preferredFocusable the View that has highest priority and will be 6689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * returned if it is within my bounds (null is valid) 6699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can be 6709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 6719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInMyBounds(final boolean topFocus, 6739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int top, View preferredFocusable) { 6749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The fading edge's transparent side should be considered for focus 6769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * since it's mostly visible, so we divide the actual fading edge length 6779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * by 2. 6789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int fadingEdgeLength = getVerticalFadingEdgeLength() / 2; 6809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int topWithoutFadingEdge = top + fadingEdgeLength; 6819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomWithoutFadingEdge = top + getHeight() - fadingEdgeLength; 6829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((preferredFocusable != null) 6849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getTop() < bottomWithoutFadingEdge) 6859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getBottom() > topWithoutFadingEdge)) { 6869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return preferredFocusable; 6879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return findFocusableViewInBounds(topFocus, topWithoutFadingEdge, 6909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project bottomWithoutFadingEdge); 6919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 6969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 6999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 7009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 7019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 7029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 7039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 7049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 7059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 7069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 7079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 7099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 7119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 7129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 7159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 7169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 7179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 7189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 7199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 7219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 7239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 7249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 7259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 7269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 7279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 7299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 7319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 7329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 7359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 7369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 7389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 7399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 7419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 7439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 7449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 7459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 7469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 7489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 7499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 7519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 7529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 7539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 7589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 7599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 7619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 7629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 7649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 7659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 7749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 7789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 7799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 7809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 7819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 7829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 7849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 7859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 7869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 7899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 7909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 7919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 7939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 7949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 7959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 7969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 7979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 7989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 7999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 8039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 8049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 8059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 8089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 8109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 8149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 8159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 8169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 8179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 8189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 8209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 8219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 8229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 8239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 8259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 8269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 8279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 8299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 8309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 8329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 8339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 8349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 8355435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson mTempRect.bottom = view.getBottom() + mPaddingBottom; 8369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 8379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 8419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the new visible area, the focus is reclaimed by this scrollview.</p> 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go upward 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to downward 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 8559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 8609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 8619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused != findFocus() && newFocused.requestFocus(direction)) { 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = true; 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = false; 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9007d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 913ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 914ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 9155435a06010fb50dd8b495df6b7f21f15d82a2c0aMattias Petersson int screenBottom = getScrollY() + getHeight() - mPaddingBottom; 916ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 917ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 918ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 9477d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9547d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 9597d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 9843fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 9853fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 9863fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 9873fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 990f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 991f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 992f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 993f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 994f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 995f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 996f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project invalidate(); 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 1023a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 1024a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 10250b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 1026a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 10270b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 10280b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 10290a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell int scrollRange = getChildAt(0).getBottom(); 10300a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int scrollY = mScrollY; 10310a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 10320a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (scrollY < 0) { 10330a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell scrollRange -= scrollY; 10340a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } else if (scrollY > overscrollBottom) { 10350a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell scrollRange += scrollY - overscrollBottom; 10360a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 10370a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 10380a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell return scrollRange; 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10410b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 10420b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 10430b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 10440b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 10499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 109817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 10990a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (oldX != x || oldY != y) { 1100737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell overScrollBy(x - oldX, y - oldY, oldX, oldY, 0, getScrollRange(), 11010a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 0, mOverflingDistance, false); 11020a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell onScrollChanged(mScrollX, mScrollY, oldX, oldY); 11030a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 11040a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int range = getScrollRange(); 1105737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell final int overscrollMode = getOverScrollMode(); 1106737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell if (overscrollMode == OVER_SCROLL_ALWAYS || 1107737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell (overscrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && range > 0)) { 1108e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell if (y < 0 && oldY >= 0) { 1109e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell mEdgeGlowTop.onAbsorb((int) mScroller.getCurrVelocity()); 1110e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell } else if (y > range && oldY <= range) { 1111e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell mEdgeGlowBottom.onAbsorb((int) mScroller.getCurrVelocity()); 1112e6ffce9f65a1a8f498eb51a993a8cbf5f13a109eAdam Powell } 11139d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell } 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1115a0d645cb6980113a624e6e70a7fa9ae5e91bbac8Adam Powell awakenScrollBars(); 11169d32d24dbd8a015c9d5c44ed4901d5a666eb8e7fAdam Powell 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Keep on drawing until the animation has finished. 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project postInvalidate(); 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 11429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 11499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1170ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 11799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 11809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 11819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 11859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 11869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 11919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 11929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 11969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 11979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1204ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScrollViewMovedFocus) { 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mIsLayoutDirty) { 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(focused); 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // The child may not be laid out yet, we can't compute the scroll yet 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = focused; 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 12559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 12569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 12579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 12589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 12619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 12629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 12639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 12649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 12669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 12709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 12749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 12789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 12799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 12849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 12889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 12899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 12909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 12949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 12959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 12969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Give a child focus if it needs it 12979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 12989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(mChildToScrollTo); 12999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Calling this with the present values causes it to re-clam them 13039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 13049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13147d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 13157d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 13167d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 13177d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return true if child is an descendant of parent, (or equal to the parent). 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isViewDescendantOf(View child, View parent) { 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 134152964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * numbers mean that the finger/cursor is moving down the screen, 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1345ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1346ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1347ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 1348ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 134917dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 13500a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell Math.max(0, bottom - height), 0, height/2); 1351ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1352ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final boolean movingDown = velocityY > 0; 1353ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1354ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View newFocused = 1355ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy findFocusableViewInMyBounds(movingDown, mScroller.getFinalY(), findFocus()); 1356ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused == null) { 1357ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy newFocused = this; 1358ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1359ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1360ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused != findFocus() 1361ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy && newFocused.requestFocus(movingDown ? View.FOCUS_DOWN : View.FOCUS_UP)) { 1362ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = true; 1363ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = false; 1364ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1365ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1366ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy invalidate(); 13679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 137552964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne @Override 13769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 13779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 13789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 13799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 13809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 13819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 13829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 13839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 13849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13850a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 13860a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 13870a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 13880a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell @Override 1389737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell public void setOverScrollMode(int mode) { 1390737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell if (mode != OVER_SCROLL_NEVER) { 13910a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (mEdgeGlowTop == null) { 13920a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final Resources res = getContext().getResources(); 13935916882c3f13429d29f95b89dd94bd2d5733da85Adam Powell final Drawable edge = res.getDrawable(R.drawable.overscroll_edge); 13940a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final Drawable glow = res.getDrawable(R.drawable.overscroll_glow); 13950a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowTop = new EdgeGlow(edge, glow); 13960a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowBottom = new EdgeGlow(edge, glow); 13970a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 13980a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } else { 13990a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowTop = null; 14000a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowBottom = null; 14010a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 1402737e8fe2c7ce167bc68ad779160488007a5e0b1dAdam Powell super.setOverScrollMode(mode); 14030a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 14040a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 14050a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell @Override 14060a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell public void draw(Canvas canvas) { 14070a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell super.draw(canvas); 14080a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (mEdgeGlowTop != null) { 14090a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int scrollY = mScrollY; 14100a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (!mEdgeGlowTop.isFinished()) { 14110a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int restoreCount = canvas.save(); 14120a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int width = getWidth(); 14130a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 14145916882c3f13429d29f95b89dd94bd2d5733da85Adam Powell canvas.translate(-width / 2, Math.min(0, scrollY)); 14150a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowTop.setSize(width * 2, getHeight()); 14160a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (mEdgeGlowTop.draw(canvas)) { 14170a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell invalidate(); 14180a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 14190a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell canvas.restoreToCount(restoreCount); 14200a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 14210a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (!mEdgeGlowBottom.isFinished()) { 14220a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int restoreCount = canvas.save(); 14230a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int width = getWidth(); 14240a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell final int height = getHeight(); 14250a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell 14265916882c3f13429d29f95b89dd94bd2d5733da85Adam Powell canvas.translate(-width / 2, Math.max(getScrollRange(), scrollY) + height); 14270a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell canvas.rotate(180, width, 0); 14280a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell mEdgeGlowBottom.setSize(width * 2, height); 14290a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell if (mEdgeGlowBottom.draw(canvas)) { 14300a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell invalidate(); 14310a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 14320a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell canvas.restoreToCount(restoreCount); 14330a77ce277c6ed2aa25bbea5f8cd5687c0720cb68Adam Powell } 14349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 14379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int clamp(int n, int my, int child) { 14389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 14399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 14409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 14419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 14429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 14439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 14449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 14459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 14469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 14479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 14489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 14499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 14509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 14519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 14529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 14539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 14559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 14579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 14589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 14599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 14609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 14619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 14629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 14639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 14659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 14669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1467