HorizontalScrollView.java revision 4cd47702f00a2fd6d6bc16c5398edb884d98bdca
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; 1194cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 1204cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell /** 1214cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * ID of the active pointer. This is used to retain consistency during 1224cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * drags/flings if multiple pointers are used. 1234cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell */ 1244cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private int mActivePointerId = INVALID_POINTER; 1254cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 1264cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell /** 1274cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * Sentinel value for no current active pointer. 1284cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * Used by {@link #mActivePointerId}. 1294cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell */ 1304cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private static final int INVALID_POINTER = -1; 1314cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context) { 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context, AttributeSet attrs) { 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.horizontalScrollViewStyle); 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public HorizontalScrollView(Context context, AttributeSet attrs, int defStyle) { 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = context.obtainStyledAttributes(attrs, 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project android.R.styleable.HorizontalScrollView, defStyle, 0); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(android.R.styleable.HorizontalScrollView_fillViewport, false)); 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getLeftFadingEdgeStrength() { 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getHorizontalFadingEdgeLength(); 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollX < length) { 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollX / (float) length; 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getRightFadingEdgeStrength() { 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getHorizontalFadingEdgeLength(); 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int rightEdge = getWidth() - mPaddingRight; 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getRight() - mScrollX - rightEdge; 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mRight - mLeft)); 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 19217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller = new OverScroller(getContext()); 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 1959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 1964296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 1974296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 1984296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 1994296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("HorizontalScrollView can host only one direct child"); 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this HorizontalScrollView can be scrolled 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidth = child.getWidth(); 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getWidth() < childWidth + mPaddingLeft + mPaddingRight ; 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content width to fill 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's width to the viewport's 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int widthMode = MeasureSpec.getMode(widthMeasureSpec); 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (widthMode == MeasureSpec.UNSPECIFIED) { 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 301ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 302ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 303ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int width = getMeasuredWidth(); 304ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredWidth() < width) { 305ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 306ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 307ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = getChildMeasureSpec(heightMeasureSpec, mPaddingTop 308ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy + mPaddingBottom, lp.height); 309ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy width -= mPaddingLeft; 310ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy width -= mPaddingRight; 311ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY); 312ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 313ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 314ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = super.dispatchKeyEvent(event); 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (handled) { 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return executeKeyEvent(event); 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isFocused()) { 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_RIGHT); 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null && nextFocused != this && 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(View.FOCUS_RIGHT); 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_LEFT: 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_LEFT); 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_LEFT); 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_RIGHT: 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_RIGHT); 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_RIGHT); 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_LEFT : View.FOCUS_RIGHT); 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3774cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private boolean inChild(int x, int y) { 3784cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (getChildCount() > 0) { 3794cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final View child = getChildAt(0); 3804cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell return !(y < child.getTop() 3814cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell || y >= child.getBottom() 3824cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell || x < child.getLeft() 3834cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell || x >= child.getRight()); 3844cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 3854cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell return false; 3864cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 3874cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4064cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell switch (action & MotionEvent.ACTION_MASK) { 4074cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_MOVE: { 4089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionX is set to the x value 4159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4174cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int pointerIndex = ev.findPointerIndex(mActivePointerId); 4184cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final float x = ev.getX(pointerIndex); 4199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int xDiff = (int) Math.abs(x - mLastMotionX); 4209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (xDiff > mTouchSlop) { 4219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 4224cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mLastMotionX = x; 4239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mParent != null) mParent.requestDisallowInterceptTouchEvent(true); 4249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4264cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 4279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4284cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_DOWN: { 4294cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final float x = ev.getX(); 4304cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) x, (int) ev.getY())) { 4314cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mIsBeingDragged = false; 4324cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 4334cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 4344cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 4354cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell /* 4364cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * Remember location of down touch. 4374cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell * ACTION_DOWN always refers to pointer index 0. 4384cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell */ 4399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionX = x; 4404cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = ev.getPointerId(0); 4419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches the screen, initiate drag; 4449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * otherwise don't. mScroller.isFinished should be false when 4459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * being flinged. 4469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = !mScroller.isFinished(); 4489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4494cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 4509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_CANCEL: 4529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 4539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Release the drag */ 4549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = false; 4554cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = INVALID_POINTER; 4564cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 4574cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_POINTER_UP: 4584cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell onSecondaryPointerUp(ev); 4599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 4719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { 4739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Don't handle edge touches immediately -- they may actually belong to one of our 4749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // descendants. 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mVelocityTracker == null) { 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker = VelocityTracker.obtain(); 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 4829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4854cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell switch (action & MotionEvent.ACTION_MASK) { 4864cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_DOWN: { 4879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches, stop the fling. isFinished 4899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be false if being flinged. 4909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 4929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 4939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4944cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 4954cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final float x = ev.getX(); 4964cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!(mIsBeingDragged = inChild((int) x, (int) ev.getY()))) { 4974cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell return false; 4984cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 4999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 5019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionX = x; 5029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5034cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 5054cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mIsBeingDragged) { 5064cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // Scroll to follow the motion event 5074cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 5084cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final float x = ev.getX(activePointerIndex); 5094cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int deltaX = (int) (mLastMotionX - x); 5104cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mLastMotionX = x; 5114cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 5124cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell overscrollBy(deltaX, 0, mScrollX, 0, getScrollRange(), 0, 5134cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell getOverscrollMax(), 0); 5144cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 5169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_UP: 5174cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mIsBeingDragged) { 5184cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final VelocityTracker velocityTracker = mVelocityTracker; 5194cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 5204cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell int initialVelocity = (int) velocityTracker.getXVelocity(mActivePointerId); 5214cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 5224cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (getChildCount() > 0) { 5234cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 5244cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell fling(-initialVelocity); 5254cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } else { 5264cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int right = getScrollRange(); 5274cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mScroller.springback(mScrollX, mScrollY, 0, 0, right, 0)) { 5284cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell invalidate(); 5294cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 53017dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 53117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 5324cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 5334cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = INVALID_POINTER; 5344cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mIsBeingDragged = false; 5359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5364cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mVelocityTracker != null) { 5374cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mVelocityTracker.recycle(); 5384cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mVelocityTracker = null; 5394cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5414cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 5424cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell case MotionEvent.ACTION_POINTER_UP: 5434cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell onSecondaryPointerUp(ev); 5444cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell break; 5459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 5479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5480b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 5494cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell private void onSecondaryPointerUp(MotionEvent ev) { 5504cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 5514cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 5524cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int pointerId = ev.getPointerId(pointerIndex); 5534cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (pointerId == mActivePointerId) { 5544cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // This was our active pointer going up. Choose a new 5554cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // active pointer and adjust accordingly. 5564cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell // TODO: Make this decision more intelligent. 5574cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 5584cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mLastMotionX = ev.getX(newPointerIndex); 5594cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 5604cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (mVelocityTracker != null) { 5614cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell mVelocityTracker.clear(); 5624cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5634cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5644cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell } 5654cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell 5660b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 5670b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected void onOverscrolled(int scrollX, int scrollY, 5680b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell boolean clampedX, boolean clampedY) { 5690b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell // Treat animating scrolls differently; see #computeScroll() for why. 5700b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (!mScroller.isFinished()) { 5710b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollX = scrollX; 5720b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollY = scrollY; 5730b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (clampedX) { 5740b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScroller.springback(mScrollX, mScrollY, 0, getScrollRange(), 0, 0); 5750b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5760b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 5770b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell super.scrollTo(scrollX, scrollY); 5780b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5790b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5800b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 5810b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getOverscrollMax() { 5820b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int childCount = getChildCount(); 5830b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int containerOverscroll = (getWidth() - mPaddingLeft - mPaddingRight) / 3; 5840b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (childCount > 0) { 5850b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.min(containerOverscroll, getChildAt(0).getWidth() / 3); 5860b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 5870b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return containerOverscroll; 5880b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5890b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5900b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 5910b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getScrollRange() { 5920b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = 0; 5930b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (getChildCount() > 0) { 5940b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell View child = getChildAt(0); 5950b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange = Math.max(0, 5960b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell child.getWidth() - getWidth() - mPaddingLeft - mPaddingRight); 5970b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 5990b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in this View's bounds 6049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (excluding fading edges) pretending that this View's left is located at 6059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the parameter left. 6069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param leftFocus look for a candidate is the one at the left of the bounds 6099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if leftFocus is true, or at the right of the bounds if leftFocus 6109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is false 6119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the bounds in which a focusable must be 6129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found (the fading edge is assumed to start at this position) 6139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param preferredFocusable the View that has highest priority and will be 6149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * returned if it is within my bounds (null is valid) 6159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can be found 6169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInMyBounds(final boolean leftFocus, 6189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int left, View preferredFocusable) { 6199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The fading edge's transparent side should be considered for focus 6219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * since it's mostly visible, so we divide the actual fading edge length 6229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * by 2. 6239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int fadingEdgeLength = getHorizontalFadingEdgeLength() / 2; 6259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int leftWithoutFadingEdge = left + fadingEdgeLength; 6269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int rightWithoutFadingEdge = left + getWidth() - fadingEdgeLength; 6279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((preferredFocusable != null) 6299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getLeft() < rightWithoutFadingEdge) 6309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getRight() > leftWithoutFadingEdge)) { 6319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return preferredFocusable; 6329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return findFocusableViewInBounds(leftFocus, leftWithoutFadingEdge, 6359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rightWithoutFadingEdge); 6369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 6419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param leftFocus look for a candidate is the one at the left of the bounds 6449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if leftFocus is true, or at the right of the bounds if 6459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * leftFocus is false 6469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the bounds in which a focusable must be 6479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 6489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param right the right offset of the bounds in which a focusable must 6499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 6509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 6519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 6529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean leftFocus, int left, int right) { 6549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 6569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 6579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its left is below the bound's 6609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * left, and its right is above the bound's right. A partially 6619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 6629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 6639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 6649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 6669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 6689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 6699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 6709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewLeft = view.getLeft(); 6719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewRight = view.getRight(); 6729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (left < viewRight && viewLeft < right) { 6749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 6769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 6779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (left < viewLeft) && 6809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewRight < right); 6819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 6839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 6849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 6859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 6869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 6879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 6889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (leftFocus && viewLeft < focusCandidate.getLeft()) || 6899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!leftFocus && viewRight > focusCandidate.getRight()); 6909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 6929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 6939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 6959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 6969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 6979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 6999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 7029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 7039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 7059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 7069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 7089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 7099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 7189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 7229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page left or right and give the focus 7239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the leftmost/rightmost component in the new visible area. If no 7249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 7259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 7269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 7289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page left or {@link android.view.View#FOCUS_RIGHT} 7299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page right 7309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 7339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean right = direction == View.FOCUS_RIGHT; 7349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 7359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (right) { 7379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = getScrollX() + width; 7389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 7399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 740ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View view = getChildAt(0); 7419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.left + width > view.getRight()) { 7429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = view.getRight() - width; 7439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = getScrollX() - width; 7479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.left < 0) { 7489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = 0; 7499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = mTempRect.left + width; 7529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.left, mTempRect.right); 7549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 7589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the left or right and give the focus 7599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the leftmost/rightmost component in the new visible area. If no 7609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 7619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 7629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 7649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the left of the view or {@link android.view.View#FOCUS_RIGHT} 7659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the right 7669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 7699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean right = direction == View.FOCUS_RIGHT; 7709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 7719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = 0; 7739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = width; 7749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (right) { 7769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 7779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 778ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View view = getChildAt(0); 7799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.right = view.getRight(); 7809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.left = mTempRect.right - width; 7819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.left, mTempRect.right); 7859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>left</code> and 7899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>right</code> visible. This method attempts to give the focus 7909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 7919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the new visible area, the focus is reclaimed by this scrollview.</p> 7929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_LEFT} 7949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go left {@link android.view.View#FOCUS_RIGHT} to right 7959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param left the left offset of the new area to be made visible 7969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param right the right offset of the new area to be made visible 7979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int left, int right) { 8009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 8019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 8039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerLeft = getScrollX(); 8049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerRight = containerLeft + width; 8059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean goLeft = direction == View.FOCUS_LEFT; 8069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(goLeft, left, right); 8089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 8099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 8109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (left >= containerLeft && right <= containerRight) { 8139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 8149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = goLeft ? (left - containerLeft) : (right - containerRight); 8169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(delta); 8179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused != findFocus() && newFocused.requestFocus(direction)) { 8209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = true; 8219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = false; 8229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 8259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to a left or right arrow click. 8299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 8319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 8329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 8339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 8359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 8379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 8389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 8409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump)) { 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(scrollDelta); 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_LEFT && getScrollX() < scrollDelta) { 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollX(); 855ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } else if (direction == View.FOCUS_RIGHT && getChildCount() > 0) { 856ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 857ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daRight = getChildAt(0).getRight(); 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenRight = getScrollX() + getWidth(); 8609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (daRight - screenRight < maxJump) { 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = daRight - screenRight; 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 8679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(direction == View.FOCUS_RIGHT ? scrollDelta : -scrollDelta); 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return !isWithinDeltaOfScreen(descendant, 0); 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isWithinDeltaOfScreen(View descendant, int delta) { 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.right + delta) >= getScrollX() 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (mTempRect.left - delta) <= (getScrollX() + getWidth()); 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a X delta 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the X axis 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollX(int delta) { 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(delta, 0); 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(delta, 0); 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 9283fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 9293fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 9303fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 9313fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 934f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int width = getWidth() - mPaddingRight - mPaddingLeft; 935f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int right = getChildAt(0).getWidth(); 936f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxX = Math.max(0, right - width); 937f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollX = mScrollX; 938f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX; 939f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 940f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(scrollX, mScrollY, dx, 0); 941f116bf8884b5b58aae261d148003811aa4a7c6e9Mike Cleron awakenScrollBars(mScroller.getDuration()); 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project invalidate(); 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall width of all of its 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeHorizontalScrollRange() { 968a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 969a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentWidth = getWidth() - mPaddingLeft - mPaddingRight; 9700b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 971a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentWidth; 9720b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9730b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9740b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = getChildAt(0).getRight(); 975a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int scrollX = mScrollX; 976a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int overscrollRight = Math.max(0, scrollRange - contentWidth); 9770b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (scrollX < 0) { 9780b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange -= scrollX; 9790b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else if (scrollX > overscrollRight) { 9800b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange += scrollX - overscrollRight; 9810b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9820b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9830b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 9840b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9850b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9860b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 9870b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeHorizontalScrollOffset() { 9880b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeHorizontalScrollOffset()); 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 9939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 9949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, mPaddingTop 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingBottom, lp.height); 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + heightUsed, lp.height); 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec( 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.leftMargin + lp.rightMargin, MeasureSpec.UNSPECIFIED); 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 104317dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 10440b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (oldX != x || oldY != y) { 10450b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell overscrollBy(x - oldX, y - oldY, oldX, oldY, getScrollRange(), 0, 10460b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell getOverscrollMax(), 0); 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Keep on drawing until the animation has finished. 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project postInvalidate(); 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(scrollDelta, 0); 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(delta, 0); 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(delta, 0); 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the X direction in order to get 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1103ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int width = getWidth(); 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenLeft = getScrollX(); 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenRight = screenLeft + width; 11089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getHorizontalFadingEdgeLength(); 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for left fading edge as long as rect isn't at very left 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.left > 0) { 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenLeft += fadingEdge; 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for right fading edge as long as rect isn't at very right 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.right < getChildAt(0).getWidth()) { 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenRight -= fadingEdge; 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollXDelta = 0; 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.right > screenRight && rect.left > screenLeft) { 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move right to get it in view: move right just enough so 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.width() > width) { 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta += (rect.left - screenLeft); 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at right of screen 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta += (rect.right - screenRight); 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1137ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int right = getChildAt(0).getRight(); 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToRight = right - screenRight; 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta = Math.min(scrollXDelta, distanceToRight); 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.left < screenLeft && rect.right < screenRight) { 11429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move right to get it in view: move right just enough so that 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.width() > width) { 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta -= (screenRight - rect.right); 11499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at left 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta -= (screenLeft - rect.left); 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the left our content 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollXDelta = Math.max(scrollXDelta, -getScrollX()); 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollXDelta; 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScrollViewMovedFocus) { 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mIsLayoutDirty) { 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(focused); 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // The child may not be laid out yet, we can't compute the scroll yet 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = focused; 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 11799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 11809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 11839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 11869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 11879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_RIGHT; 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 11909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_LEFT; 11919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 11969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 11979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Give a child focus if it needs it 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(mChildToScrollTo); 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Calling this with the present values causes it to re-clam them 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = mRight - mLeft; 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isWithinDeltaOfScreen(currentFocused, maxJump)) { 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollX(scrollDelta); 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return true if child is an descendant of parent, (or equal to the parent). 12599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isViewDescendantOf(View child, View parent) { 12619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 12629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 12639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 12669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 12679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 12719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityX The initial velocity in the X direction. Positive 12739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * numbers mean that the finger/curor is moving down the screen, 12749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the left. 12759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityX) { 1277ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1278ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int width = getWidth() - mPaddingRight - mPaddingLeft; 1279ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int right = getChildAt(0).getWidth(); 1280ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 128117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller.fling(mScrollX, mScrollY, velocityX, 0, 0, 128217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell Math.max(0, right - width), 0, 0, width/2, 0); 1283ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1284ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final boolean movingRight = velocityX > 0; 1285ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1286ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View newFocused = findFocusableViewInMyBounds(movingRight, 1287ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScroller.getFinalX(), findFocus()); 1288ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1289ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused == null) { 1290ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy newFocused = this; 1291ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1292ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1293ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused != findFocus() 1294ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy && newFocused.requestFocus(movingRight ? View.FOCUS_RIGHT : View.FOCUS_LEFT)) { 1295ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = true; 1296ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = false; 1297ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1298ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1299f116bf8884b5b58aae261d148003811aa4a7c6e9Mike Cleron awakenScrollBars(mScroller.getDuration()); 1300ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy invalidate(); 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 13149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 13159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 13169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int clamp(int n, int my, int child) { 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my + n) > child) { 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child - my; 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1331