HorizontalScrollView.java revision a2f91016840bf4f7274577d40f3610e38b77f2ad
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2009 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A HorizontalScrollView 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a horizontal orientation, presenting a horizontal 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>You should never use a HorizontalScrollView with a {@link ListView}, since 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ListView takes care of its own scrolling. Most importantly, doing this 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * defeats all of the important optimizations in ListView for dealing with 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * large lists, since it effectively forces the ListView to display its entire 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * list of items to fill up the infinite container supplied by HorizontalScrollView. 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>HorizontalScrollView only supports horizontal scrolling. 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class HorizontalScrollView extends FrameLayout { 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final int ANIMATED_SCROLL_GAP = ScrollView.ANIMATED_SCROLL_GAP; 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private static final float MAX_SCROLL_FACTOR = ScrollView.MAX_SCROLL_FACTOR; 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 6617dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell private OverScroller mScroller; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Flag to indicate that we are moving focus ourselves. This is so the 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * code that watches for focus changes initiated outside this ScrollView 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * knows that it does not have to do anything. 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mScrollViewMovedFocus; 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mLastMotionX; 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1174296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1184296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context) { 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context, AttributeSet attrs) { 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.horizontalScrollViewStyle); 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context, AttributeSet attrs, int defStyle) { 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = context.obtainStyledAttributes(attrs, 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project android.R.styleable.HorizontalScrollView, defStyle, 0); 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(android.R.styleable.HorizontalScrollView_fillViewport, false)); 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getLeftFadingEdgeStrength() { 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getHorizontalFadingEdgeLength(); 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollX < length) { 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollX / (float) length; 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getRightFadingEdgeStrength() { 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getHorizontalFadingEdgeLength(); 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int rightEdge = getWidth() - mPaddingRight; 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getRight() - mScrollX - rightEdge; 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (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 /** 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mRight - mLeft)); 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 18017dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller = new OverScroller(getContext()); 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 1844296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 1854296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 1864296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 1874296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 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, ViewGroup.LayoutParams params) { 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 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, ViewGroup.LayoutParams params) { 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this HorizontalScrollView can be scrolled 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidth = child.getWidth(); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getWidth() < childWidth + mPaddingLeft + mPaddingRight ; 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content width to fill 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's width to the viewport's 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int widthMode = MeasureSpec.getMode(widthMeasureSpec); 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (widthMode == MeasureSpec.UNSPECIFIED) { 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 289ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 290ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 291ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int width = getMeasuredWidth(); 292ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredWidth() < width) { 293ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 294ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 295ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, mPaddingTop 296ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy + mPaddingBottom, lp.height); 297ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy width -= mPaddingLeft; 298ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy width -= mPaddingRight; 299ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY); 300ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 301ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 302ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = super.dispatchKeyEvent(event); 3109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (handled) { 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return executeKeyEvent(event); 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isFocused()) { 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_RIGHT); 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null && nextFocused != this && 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(View.FOCUS_RIGHT); 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_LEFT: 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_LEFT); 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_LEFT); 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_RIGHT: 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_RIGHT); 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_RIGHT); 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_LEFT : View.FOCUS_RIGHT); 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 3799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 3809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 3819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final float x = ev.getX(); 3849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (action) { 3869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 3879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionX is set to the x value 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int xDiff = (int) Math.abs(x - mLastMotionX); 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (xDiff > mTouchSlop) { 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mParent != null) mParent.requestDisallowInterceptTouchEvent(true); 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_DOWN: 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Remember location of down touch */ 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionX = x; 4069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 4109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 4119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 4139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 4169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 4179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 4189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 4199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 4249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 4259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 4279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 4319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { 4339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Don't handle edge touches immediately -- they may actually belong to one of our 4349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // descendants. 4359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 4369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mVelocityTracker == null) { 4399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker = VelocityTracker.obtain(); 4409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 4429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final float x = ev.getX(); 4459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (action) { 4479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_DOWN: 4489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches, stop the fling. isFinished 4509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be false if being flinged. 4519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 4539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 4549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 4579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionX = x; 4589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 4609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Scroll to follow the motion event 4619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int deltaX = (int) (mLastMotionX - x); 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionX = x; 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4640b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell overscrollBy(deltaX, 0, mScrollX, 0, getScrollRange(), 0, 4650b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell getOverscrollMax(), 0); 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final VelocityTracker velocityTracker = mVelocityTracker; 4694296fc4d326447875c26a925f12b3935632f13bbRomain Guy velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 4709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int initialVelocity = (int) velocityTracker.getXVelocity(); 4719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 47217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell if (getChildCount() > 0) { 47317dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 47417dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell fling(-initialVelocity); 47517dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } else { 4760b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell final int right = getScrollRange(); 47717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell if (mScroller.springback(mScrollX, mScrollY, 0, 0, right, 0)) { 47817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell invalidate(); 47917dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 48017dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mVelocityTracker != null) { 4849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.recycle(); 4859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker = null; 4869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4900b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 4910b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 4920b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected void onOverscrolled(int scrollX, int scrollY, 4930b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell boolean clampedX, boolean clampedY) { 4940b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell // Treat animating scrolls differently; see #computeScroll() for why. 4950b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (!mScroller.isFinished()) { 4960b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollX = scrollX; 4970b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollY = scrollY; 4980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (clampedX) { 4990b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScroller.springback(mScrollX, mScrollY, 0, getScrollRange(), 0, 0); 5000b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5010b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 5020b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell super.scrollTo(scrollX, scrollY); 5030b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5040b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5050b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 5060b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getOverscrollMax() { 5070b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int childCount = getChildCount(); 5080b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int containerOverscroll = (getWidth() - mPaddingLeft - mPaddingRight) / 3; 5090b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (childCount > 0) { 5100b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.min(containerOverscroll, getChildAt(0).getWidth() / 3); 5110b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 5120b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return containerOverscroll; 5130b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5140b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5150b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 5160b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getScrollRange() { 5170b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = 0; 5180b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (getChildCount() > 0) { 5190b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell View child = getChildAt(0); 5200b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange = Math.max(0, 5210b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell child.getWidth() - getWidth() - mPaddingLeft - mPaddingRight); 5220b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5230b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 5240b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 5279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 5289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in this View's bounds 5299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (excluding fading edges) pretending that this View's left is located at 5309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the parameter left. 5319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 5329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 5339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param leftFocus look for a candidate is the one at the left of the bounds 5349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if leftFocus is true, or at the right of the bounds if leftFocus 5359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is false 5369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the bounds in which a focusable must be 5379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found (the fading edge is assumed to start at this position) 5389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param preferredFocusable the View that has highest priority and will be 5399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * returned if it is within my bounds (null is valid) 5409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can be found 5419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInMyBounds(final boolean leftFocus, 5439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int left, View preferredFocusable) { 5449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The fading edge's transparent side should be considered for focus 5469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * since it's mostly visible, so we divide the actual fading edge length 5479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * by 2. 5489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int fadingEdgeLength = getHorizontalFadingEdgeLength() / 2; 5509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int leftWithoutFadingEdge = left + fadingEdgeLength; 5519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int rightWithoutFadingEdge = left + getWidth() - fadingEdgeLength; 5529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((preferredFocusable != null) 5549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getLeft() < rightWithoutFadingEdge) 5559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getRight() > leftWithoutFadingEdge)) { 5569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return preferredFocusable; 5579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return findFocusableViewInBounds(leftFocus, leftWithoutFadingEdge, 5609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rightWithoutFadingEdge); 5619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 5649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 5659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 5669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 5679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 5689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param leftFocus look for a candidate is the one at the left of the bounds 5699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if leftFocus is true, or at the right of the bounds if 5709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * leftFocus is false 5719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the bounds in which a focusable must be 5729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 5739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param right the right offset of the bounds in which a focusable must 5749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 5759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 5769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 5779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean leftFocus, int left, int right) { 5799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 5819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 5829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 5849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its left is below the bound's 5859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * left, and its right is above the bound's right. A partially 5869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 5879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 5889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 5899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 5909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 5919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 5939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 5949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 5959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewLeft = view.getLeft(); 5969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewRight = view.getRight(); 5979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (left < viewRight && viewLeft < right) { 5999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 6019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 6029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (left < viewLeft) && 6059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewRight < right); 6069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 6089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 6099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 6109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 6119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 6129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 6139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (leftFocus && viewLeft < focusCandidate.getLeft()) || 6149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!leftFocus && viewRight > focusCandidate.getRight()); 6159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 6179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 6189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 6209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 6219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 6229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 6249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 6269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 6279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 6289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 6299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 6309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 6319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 6339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 6349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 6369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 6439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 6479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page left or right and give the focus 6489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the leftmost/rightmost component in the new visible area. If no 6499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 6509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 6519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 6539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page left or {@link android.view.View#FOCUS_RIGHT} 6549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page right 6559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 6569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 6589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean right = direction == View.FOCUS_RIGHT; 6599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 6609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (right) { 6629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = getScrollX() + width; 6639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 6649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 665ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View view = getChildAt(0); 6669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.left + width > view.getRight()) { 6679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = view.getRight() - width; 6689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 6719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = getScrollX() - width; 6729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.left < 0) { 6739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = 0; 6749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = mTempRect.left + width; 6779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.left, mTempRect.right); 6799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 6839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the left or right and give the focus 6849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the leftmost/rightmost component in the new visible area. If no 6859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 6869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 6879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 6899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the left of the view or {@link android.view.View#FOCUS_RIGHT} 6909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the right 6919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 6929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 6949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean right = direction == View.FOCUS_RIGHT; 6959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 6969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = 0; 6989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = width; 6999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (right) { 7019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 7029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 703ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View view = getChildAt(0); 7049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = view.getRight(); 7059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = mTempRect.right - width; 7069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.left, mTempRect.right); 7109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>left</code> and 7149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>right</code> visible. This method attempts to give the focus 7159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 7169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the new visible area, the focus is reclaimed by this scrollview.</p> 7179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 7199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go left {@link android.view.View#FOCUS_RIGHT} to right 7209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the new area to be made visible 7219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param right the right offset of the new area to be made visible 7229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int left, int right) { 7259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 7269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 7289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerLeft = getScrollX(); 7299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerRight = containerLeft + width; 7309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean goLeft = direction == View.FOCUS_LEFT; 7319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(goLeft, left, right); 7339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 7349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 7359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (left >= containerLeft && right <= containerRight) { 7389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 7399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = goLeft ? (left - containerLeft) : (right - containerRight); 7419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(delta); 7429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused != findFocus() && newFocused.requestFocus(direction)) { 7459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = true; 7469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = false; 7479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 7509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to a left or right arrow click. 7549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 7569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 7579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 7589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 7609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 7629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 7639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 7659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 7679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump)) { 7699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 7709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 7719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 7729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(scrollDelta); 7739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 7749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 7769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 7779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_LEFT && getScrollX() < scrollDelta) { 7799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollX(); 780ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } else if (direction == View.FOCUS_RIGHT && getChildCount() > 0) { 781ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 782ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daRight = getChildAt(0).getRight(); 7839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenRight = getScrollX() + getWidth(); 7859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (daRight - screenRight < maxJump) { 7879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = daRight - screenRight; 7889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 7919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 7929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(direction == View.FOCUS_RIGHT ? scrollDelta : -scrollDelta); 7949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 7979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 7989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 7999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 8009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 8019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 8029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 8039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 8049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 8059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 8069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 8079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 8099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 8139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 8149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 8169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return !isWithinDeltaOfScreen(descendant, 0); 8179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 8219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 8229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isWithinDeltaOfScreen(View descendant, int delta) { 8249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 8259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 8269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.right + delta) >= getScrollX() 8289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (mTempRect.left - delta) <= (getScrollX() + getWidth()); 8299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a X delta 8339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the X axis 8359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollX(int delta) { 8379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 8389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 8399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(delta, 0); 8409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(delta, 0); 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 8533fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 8543fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 8553fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 8563fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 859f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int width = getWidth() - mPaddingRight - mPaddingLeft; 860f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int right = getChildAt(0).getWidth(); 861f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxX = Math.max(0, right - width); 862f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollX = mScrollX; 863f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX; 864f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 865f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(scrollX, mScrollY, dx, 0); 866f116bf8884b5b58aae261d148003811aa4a7c6e9Mike Cleron awakenScrollBars(mScroller.getDuration()); 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project invalidate(); 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall width of all of its 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeHorizontalScrollRange() { 893a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 894a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentWidth = getWidth() - mPaddingLeft - mPaddingRight; 8950b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 896a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentWidth; 8970b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 8980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 8990b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = getChildAt(0).getRight(); 900a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int scrollX = mScrollX; 901a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int overscrollRight = Math.max(0, scrollRange - contentWidth); 9020b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (scrollX < 0) { 9030b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange -= scrollX; 9040b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else if (scrollX > overscrollRight) { 9050b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange += scrollX - overscrollRight; 9060b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9070b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9080b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 9090b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9100b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9110b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 9120b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeHorizontalScrollOffset() { 9130b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeHorizontalScrollOffset()); 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, mPaddingTop 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingBottom, lp.height); 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + heightUsed, lp.height); 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED); 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 96817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 9690b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (oldX != x || oldY != y) { 9700b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell overscrollBy(x - oldX, y - oldY, oldX, oldY, getScrollRange(), 0, 9710b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell getOverscrollMax(), 0); 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Keep on drawing until the animation has finished. 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project postInvalidate(); 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 9849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 9949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(scrollDelta, 0); 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(delta, 0); 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(delta, 0); 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the X direction in order to get 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1028ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenLeft = getScrollX(); 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenRight = screenLeft + width; 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getHorizontalFadingEdgeLength(); 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for left fading edge as long as rect isn't at very left 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.left > 0) { 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenLeft += fadingEdge; 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for right fading edge as long as rect isn't at very right 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.right < getChildAt(0).getWidth()) { 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenRight -= fadingEdge; 10449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollXDelta = 0; 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.right > screenRight && rect.left > screenLeft) { 10499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move right to get it in view: move right just enough so 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.width() > width) { 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta += (rect.left - screenLeft); 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at right of screen 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta += (rect.right - screenRight); 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1062ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int right = getChildAt(0).getRight(); 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToRight = right - screenRight; 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta = Math.min(scrollXDelta, distanceToRight); 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.left < screenLeft && rect.right < screenRight) { 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move right to get it in view: move right just enough so that 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.width() > width) { 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta -= (screenRight - rect.right); 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at left 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta -= (screenLeft - rect.left); 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the left our content 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta = Math.max(scrollXDelta, -getScrollX()); 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollXDelta; 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScrollViewMovedFocus) { 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mIsLayoutDirty) { 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(focused); 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // The child may not be laid out yet, we can't compute the scroll yet 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = focused; 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 11089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_RIGHT; 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_LEFT; 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 11429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Give a child focus if it needs it 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(mChildToScrollTo); 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Calling this with the present values causes it to re-clam them 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = mRight - mLeft; 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isWithinDeltaOfScreen(currentFocused, maxJump)) { 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(scrollDelta); 11799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return true if child is an descendant of parent, (or equal to the parent). 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isViewDescendantOf(View child, View parent) { 11869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 11879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 11919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 11929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 11969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityX The initial velocity in the X direction. Positive 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * numbers mean that the finger/curor is moving down the screen, 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the left. 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityX) { 1202ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1203ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int width = getWidth() - mPaddingRight - mPaddingLeft; 1204ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int right = getChildAt(0).getWidth(); 1205ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 120617dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller.fling(mScrollX, mScrollY, velocityX, 0, 0, 120717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell Math.max(0, right - width), 0, 0, width/2, 0); 1208ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1209ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final boolean movingRight = velocityX > 0; 1210ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1211ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View newFocused = findFocusableViewInMyBounds(movingRight, 1212ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScroller.getFinalX(), findFocus()); 1213ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1214ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused == null) { 1215ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy newFocused = this; 1216ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1217ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1218ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused != findFocus() 1219ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy && newFocused.requestFocus(movingRight ? View.FOCUS_RIGHT : View.FOCUS_LEFT)) { 1220ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = true; 1221ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = false; 1222ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1223ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1224f116bf8884b5b58aae261d148003811aa4a7c6e9Mike Cleron awakenScrollBars(mScroller.getDuration()); 1225ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy invalidate(); 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int clamp(int n, int my, int child) { 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my + n) > child) { 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child - my; 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1256