ScrollView.java revision 352b978fa8332808ce38c6f52edd04c8dcb9e7e3
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2006 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.widget; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1917dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powellimport com.android.internal.R; 2017dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.res.TypedArray; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>ScrollView only supports vertical scrolling. 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 6217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell private OverScroller mScroller; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Flag to indicate that we are moving focus ourselves. This is so the 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * code that watches for focus changes initiated outside this ScrollView 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * knows that it does not have to do anything. 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mScrollViewMovedFocus; 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mLastMotionY; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1134296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1144296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 115bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 116bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 117bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 118bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 119bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 120bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 121bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 122bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 123bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 124bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 125bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 126bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs, int defStyle) { 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.ScrollView, defStyle, 0); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 18817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller = new OverScroller(getContext()); 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 1919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 1924296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 1934296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 1944296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 1954296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 1969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 297ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 298ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 299ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 300ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 301ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 302ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 303ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, mPaddingLeft 304ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy + mPaddingRight, lp.width); 305ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 306ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 307ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 308ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 309ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 310ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 311ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3188e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy return super.dispatchKeyEvent(event) || executeKeyEvent(event); 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isFocused()) { 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3719f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 3729f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 373352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell final int scrollY = mScrollY; 3749f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 375352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell return !(y < child.getTop() - scrollY 376352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell || y >= child.getBottom() - scrollY 3779f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 3789f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 3799f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 3809f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 3819f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 3829f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 3839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 3859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 3879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 3889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 401bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 402bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4129d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int activePointerId = mActivePointerId; 4139d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell if (activePointerId == INVALID_POINTER) { 4149d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell // If we don't have a valid id, the touch down wasn't on content. 4159d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell break; 4169d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell } 4179d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell 4189d0335b1e3a2c70506db2413ac8d8a0f88ba6becAdam Powell final int pointerIndex = ev.findPointerIndex(activePointerId); 419bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(pointerIndex); 4209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int yDiff = (int) Math.abs(y - mLastMotionY); 4219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (yDiff > mTouchSlop) { 4229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsBeingDragged = true; 423f7b4accbda1a4d98a5fadbf3984cb9666a4fe9e9Romain Guy mLastMotionY = y; 4249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 426bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 4279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 428bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 429bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(); 4304cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!inChild((int) ev.getX(), (int) y)) { 4319f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mIsBeingDragged = false; 4329f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato break; 4339f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 4349f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 435bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /* 436bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Remember location of down touch. 437bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ACTION_DOWN always refers to pointer index 0. 438bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 4399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 440bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam 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; 449bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam 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; 455bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 456352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mScroller.springback(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 457352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell invalidate(); 458352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 459bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 460bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 461bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 4709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 4749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Don't handle edge touches immediately -- they may actually belong to one of our 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // descendants. 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mVelocityTracker == null) { 4829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker = VelocityTracker.obtain(); 4839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 4859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 488bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 489bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 490bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(); 4914cd47702f00a2fd6d6bc16c5398edb884d98bdcaAdam Powell if (!(mIsBeingDragged = inChild((int) ev.getX(), (int) y))) { 4929f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 4939f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 494bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 495352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell /* 496352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * If being flinged and user touches, stop the fling. isFinished 497352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell * will be false if being flinged. 498352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell */ 499352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (!mScroller.isFinished()) { 500352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mScroller.abortAnimation(); 501352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 502352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell 5039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 5049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 505bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 507bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 5099f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 5109f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 511bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 512bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(activePointerIndex); 5139f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final int deltaY = (int) (mLastMotionY - y); 5149f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mLastMotionY = y; 5159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5168e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy final int oldX = mScrollX; 5178e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy final int oldY = mScrollY; 5189f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato overscrollBy(0, deltaY, 0, mScrollY, 0, getScrollRange(), 5198a836a8b98557263152a476f614b6e05e19ffc5aAdam Powell 0, getOverscrollMax(), true); 5208e618e54ef0f009cac15972af9d9a72d6f6b6f94Romain Guy onScrollChanged(mScrollX, mScrollY, oldX, oldY); 5219f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 522bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 523bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_UP: 5249f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 5259f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 5269f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 527bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 5289f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 5299f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 5309f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 5319f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato fling(-initialVelocity); 5329f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } else { 5339f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final int bottom = getScrollRange(); 5349f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mScroller.springback(mScrollX, mScrollY, 0, 0, 0, bottom)) { 5359f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato invalidate(); 5369f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 53717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 53817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 5399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 540bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 541bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mIsBeingDragged = false; 542bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 5439f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mVelocityTracker != null) { 5449f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mVelocityTracker.recycle(); 5459f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mVelocityTracker = null; 5469f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 5479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 548bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 549352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell case MotionEvent.ACTION_CANCEL: 550352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mIsBeingDragged && getChildCount() > 0) { 551352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mScroller.springback(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) { 552352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell invalidate(); 553352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 554352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mActivePointerId = INVALID_POINTER; 555352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mIsBeingDragged = false; 556352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell if (mVelocityTracker != null) { 557352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mVelocityTracker.recycle(); 558352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell mVelocityTracker = null; 559352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 560352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell } 561352b978fa8332808ce38c6f52edd04c8dcb9e7e3Adam Powell break; 562bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 563bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 564bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 5659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 5679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5680b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 569bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 570bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 571bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 572bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 573bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 574bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 575bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 576bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 577bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 578bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mLastMotionY = ev.getY(newPointerIndex); 579bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 580bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 581bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 582bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 583bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 584bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 585bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 5860b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 5870b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected void onOverscrolled(int scrollX, int scrollY, 5880b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell boolean clampedX, boolean clampedY) { 5890b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell // Treat animating scrolls differently; see #computeScroll() for why. 5900b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (!mScroller.isFinished()) { 5910b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollX = scrollX; 5920b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollY = scrollY; 5930b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (clampedY) { 5940b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScroller.springback(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 5950b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5960b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 5970b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell super.scrollTo(scrollX, scrollY); 5980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 59983d570cb3f1cc59d5a72e608b04d8f666db327a7Adam Powell awakenScrollBars(); 6000b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6010b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 6020b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getOverscrollMax() { 6030b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int childCount = getChildCount(); 6040b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int containerOverscroll = (getHeight() - mPaddingBottom - mPaddingTop) / 3; 6050b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (childCount > 0) { 6060b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.min(containerOverscroll, getChildAt(0).getHeight() / 3); 6070b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 6080b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return containerOverscroll; 6090b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6100b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6110b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 6120b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getScrollRange() { 6130b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = 0; 6140b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (getChildCount() > 0) { 6150b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell View child = getChildAt(0); 6160b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange = Math.max(0, 6170b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell child.getHeight() - getHeight() - mPaddingBottom - mPaddingTop); 6180b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6190b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 6200b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in this View's bounds 6259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (excluding fading edges) pretending that this View's top is located at 6269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the parameter top. 6279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 6309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 6319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 6329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 6339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found (the fading edge is assumed to start at this position) 6349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param preferredFocusable the View that has highest priority and will be 6359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * returned if it is within my bounds (null is valid) 6369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can be 6379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 6389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInMyBounds(final boolean topFocus, 6409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int top, View preferredFocusable) { 6419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The fading edge's transparent side should be considered for focus 6439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * since it's mostly visible, so we divide the actual fading edge length 6449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * by 2. 6459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int fadingEdgeLength = getVerticalFadingEdgeLength() / 2; 6479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int topWithoutFadingEdge = top + fadingEdgeLength; 6489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomWithoutFadingEdge = top + getHeight() - fadingEdgeLength; 6499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((preferredFocusable != null) 6519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getTop() < bottomWithoutFadingEdge) 6529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getBottom() > topWithoutFadingEdge)) { 6539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return preferredFocusable; 6549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return findFocusableViewInBounds(topFocus, topWithoutFadingEdge, 6579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project bottomWithoutFadingEdge); 6589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 6639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 6669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 6679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 6689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 6699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 6709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 6719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 6729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 6739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 6749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 6769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 6789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 6799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 6829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 6839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 6849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 6859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 6869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 6889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 6909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 6919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 6929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 6939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 6949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 6969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 6989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 6999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 7029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 7039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 7059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 7069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 7089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 7109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 7119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 7129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 7139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 7159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 7169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 7189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 7199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 7209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 7259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 7269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 7289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 7299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 7319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 7329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 7419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 7459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 7469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 7479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 7489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 7499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 7519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 7529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 7539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 7569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 7579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 7589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 7609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 7619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 7629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 7639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 7649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 7659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 7669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 7709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 7719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 7729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 7759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 7779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 7819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 7829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 7839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 7849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 7859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 7879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 7889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 7899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 7929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 7939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 7949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 7969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 7979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 7999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 8009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 8019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 8029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = view.getBottom(); 8039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 8049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 8089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 8129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 8139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 8149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the new visible area, the focus is reclaimed by this scrollview.</p> 8159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 8179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go upward 8189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to downward 8199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 8209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 8219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 8229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 8249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 8259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 8279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 8289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 8299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 8309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 8329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 8339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 8349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 8379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 8389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 8409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 8419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused != findFocus() && newFocused.requestFocus(direction)) { 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = true; 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = false; 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 8559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 8569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 8619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 8629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 8649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 8669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8677d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 880ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 881ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 882ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 883ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int screenBottom = getScrollY() + getHeight(); 884ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 885ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 886ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 887ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 9039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 9167d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9237d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 9287d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 9339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 9359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 9399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 9409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 9429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 9533fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 9543fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 9553fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 9563fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 959f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 960f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 961f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 962f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 963f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 964f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 965f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 966f116bf8884b5b58aae261d148003811aa4a7c6e9Mike Cleron awakenScrollBars(mScroller.getDuration()); 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project invalidate(); 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 9739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 9759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 9799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 9819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 9829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 9849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 9859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 993a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 994a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 9950b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 996a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 9970b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9990b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = getChildAt(0).getBottom(); 1000a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int scrollY = mScrollY; 1001a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 10020b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (scrollY < 0) { 10030b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange -= scrollY; 10040b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else if (scrollY > overscrollBottom) { 10050b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange += scrollY - overscrollBottom; 10060b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 10070b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 10080b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10110b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 10120b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 10130b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 10140b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 10489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 10499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 10509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 10519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 106817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 10690b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (oldX != x || oldY != y) { 10700b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell overscrollBy(x - oldX, y - oldY, oldX, oldY, 0, getScrollRange(), 10718a836a8b98557263152a476f614b6e05e19ffc5aAdam Powell 0, getOverscrollMax(), false); 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Keep on drawing until the animation has finished. 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project postInvalidate(); 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 11089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1128ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 11429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 11499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1162ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 11809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 11819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 11839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 11879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScrollViewMovedFocus) { 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mIsLayoutDirty) { 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(focused); 11909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // The child may not be laid out yet, we can't compute the scroll yet 11929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = focused; 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 11969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 12529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 12539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 12549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Give a child focus if it needs it 12559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 12569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(mChildToScrollTo); 12579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 12599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Calling this with the present values causes it to re-clam them 12619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 12629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 12669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 12679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 12699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 12709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 12719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12727d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 12737d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 12747d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 12757d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 12769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 12779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 12789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return true if child is an descendant of parent, (or equal to the parent). 12859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isViewDescendantOf(View child, View parent) { 12879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 12889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 12899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 12929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 12939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 12979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 129952964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * numbers mean that the finger/cursor is moving down the screen, 13009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 13019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1303ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1304ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1305ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 1306ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 130717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 130817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell Math.max(0, bottom - height), 0, height/2); 1309ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1310ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final boolean movingDown = velocityY > 0; 1311ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1312ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View newFocused = 1313ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy findFocusableViewInMyBounds(movingDown, mScroller.getFinalY(), findFocus()); 1314ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused == null) { 1315ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy newFocused = this; 1316ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1317ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1318ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused != findFocus() 1319ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy && newFocused.requestFocus(movingDown ? View.FOCUS_DOWN : View.FOCUS_UP)) { 1320ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = true; 1321ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = false; 1322ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1323ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1324ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy invalidate(); 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 133352964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne @Override 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int clamp(int n, int my, int child) { 13479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 13569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 13599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 13609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 13619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 13629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 13649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 13669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 13679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 13689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 13709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 13729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 13749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1376