ScrollView.java revision bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5
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; 259f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onoratoimport android.util.Log; 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.FocusFinder; 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.KeyEvent; 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.MotionEvent; 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.VelocityTracker; 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.View; 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewConfiguration; 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewGroup; 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.ViewParent; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.view.animation.AnimationUtils; 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport java.util.List; 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Layout container for a view hierarchy that can be scrolled by the user, 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * allowing it to be larger than the physical display. A ScrollView 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link FrameLayout}, meaning you should place one child in it 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * containing the entire contents to scroll; this child may itself be a layout 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * manager with a complex hierarchy of objects. A child that is often used 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is a {@link LinearLayout} in a vertical orientation, presenting a vertical 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * array of top-level items that the user can scroll through. 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The {@link TextView} class also 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * takes care of its own scrolling, so does not require a ScrollView, but 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * using the two together is possible to achieve the effect of a text view 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * within a larger container. 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>ScrollView only supports vertical scrolling. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class ScrollView extends FrameLayout { 559f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private static final String TAG = "ScrollView"; 569f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final int ANIMATED_SCROLL_GAP = 250; 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static final float MAX_SCROLL_FACTOR = 0.5f; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private long mLastScroll; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private final Rect mTempRect = new Rect(); 6517dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell private OverScroller mScroller; 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Flag to indicate that we are moving focus ourselves. This is so the 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * code that watches for focus changes initiated outside this ScrollView 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * knows that it does not have to do anything. 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mScrollViewMovedFocus; 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Position of the last motion event. 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mLastMotionY; 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True when the layout has changed but the traversal has not come through yet. 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Ideally the view hierarchy would keep track of this for us. 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsLayoutDirty = true; 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The child to give focus to in the event that a child has requested focus while the 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * layout is dirty. This prevents the scroll from being wrong if the child has not been 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * laid out before requesting focus. 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View mChildToScrollTo = null; 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * True if the user is currently dragging this ScrollView around. This is 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * not the same as 'is being flinged', which can be checked by 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mScroller.isFinished() (flinging begins when the user lifts his finger). 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mIsBeingDragged = false; 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Determines speed during touch scrolling 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private VelocityTracker mVelocityTracker; 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When set to true, the scroll view measure its child to make it fill the currently 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * visible area. 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mFillViewport; 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Whether arrow scrolling is animated. 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean mSmoothScrollingEnabled = true; 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int mTouchSlop; 1164296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMinimumVelocity; 1174296fc4d326447875c26a925f12b3935632f13bbRomain Guy private int mMaximumVelocity; 118bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 119bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 120bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * ID of the active pointer. This is used to retain consistency during 121bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * drags/flings if multiple pointers are used. 122bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 123bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private int mActivePointerId = INVALID_POINTER; 124bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 125bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell /** 126bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Sentinel value for no current active pointer. 127bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell * Used by {@link #mActivePointerId}. 128bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell */ 129bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private static final int INVALID_POINTER = -1; 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context) { 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, null); 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs) { 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project this(context, attrs, com.android.internal.R.attr.scrollViewStyle); 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ScrollView(Context context, AttributeSet attrs, int defStyle) { 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super(context, attrs, defStyle); 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project initScrollView(); 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.ScrollView, defStyle, 0); 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFillViewport(a.getBoolean(R.styleable.ScrollView_fillViewport, false)); 1479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 1499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getTopFadingEdgeStrength() { 1539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScrollY < length) { 1599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mScrollY / (float) length; 1609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 1669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected float getBottomFadingEdgeStrength() { 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() == 0) { 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0.0f; 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int length = getVerticalFadingEdgeLength(); 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomEdge = getHeight() - mPaddingBottom; 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int span = getChildAt(0).getBottom() - mScrollY - bottomEdge; 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (span < length) { 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return span / (float) length; 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 1.0f; 1799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The maximum amount this scroll view will scroll in response to 1839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an arrow event. 1849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int getMaxScrollAmount() { 1869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (int) (MAX_SCROLL_FACTOR * (mBottom - mTop)); 1879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void initScrollView() { 19117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller = new OverScroller(getContext()); 1929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setFocusable(true); 1939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(FOCUS_AFTER_DESCENDANTS); 1949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setWillNotDraw(false); 1954296fc4d326447875c26a925f12b3935632f13bbRomain Guy final ViewConfiguration configuration = ViewConfiguration.get(mContext); 1964296fc4d326447875c26a925f12b3935632f13bbRomain Guy mTouchSlop = configuration.getScaledTouchSlop(); 1974296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMinimumVelocity = configuration.getScaledMinimumFlingVelocity(); 1984296fc4d326447875c26a925f12b3935632f13bbRomain Guy mMaximumVelocity = configuration.getScaledMaximumFlingVelocity(); 1999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child) { 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child); 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index) { 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index); 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, ViewGroup.LayoutParams params) { 2219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, params); 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void addView(View child, int index, ViewGroup.LayoutParams params) { 2309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 2319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project throw new IllegalStateException("ScrollView can host only one direct child"); 2329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.addView(child, index, params); 2359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Returns true this ScrollView can be scrolled 2399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean canScroll() { 2419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 2429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child != null) { 2439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeight = child.getHeight(); 2449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return getHeight() < childHeight + mPaddingTop + mPaddingBottom; 2459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 2479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether this ScrollView's content is stretched to fill the viewport. 2519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if the content fills the viewport, false otherwise. 2539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isFillViewport() { 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mFillViewport; 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates this ScrollView whether it should stretch its content height to fill 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the viewport or not. 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param fillViewport True to stretch the content's height to the viewport's 2639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * boundaries, false otherwise. 2649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setFillViewport(boolean fillViewport) { 2669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (fillViewport != mFillViewport) { 2679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFillViewport = fillViewport; 2689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestLayout(); 2699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether arrow scrolling will animate its transition. 2749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isSmoothScrollingEnabled() { 2769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mSmoothScrollingEnabled; 2779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Set whether arrow scrolling will animate its transition. 2819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param smoothScrollingEnabled whether arrow scrolling will animate its transition 2829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) { 2849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mSmoothScrollingEnabled = smoothScrollingEnabled; 2859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 2889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 2899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onMeasure(widthMeasureSpec, heightMeasureSpec); 2909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mFillViewport) { 2929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (heightMode == MeasureSpec.UNSPECIFIED) { 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 300ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 301ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final View child = getChildAt(0); 302ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getMeasuredHeight(); 303ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (child.getMeasuredHeight() < height) { 304ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final FrameLayout.LayoutParams lp = (LayoutParams) child.getLayoutParams(); 305ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 306ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childWidthMeasureSpec = getChildMeasureSpec(widthMeasureSpec, mPaddingLeft 307ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy + mPaddingRight, lp.width); 308ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingTop; 309ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy height -= mPaddingBottom; 310ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int childHeightMeasureSpec = 311ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 312ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 313ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 314ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 3159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean dispatchKeyEvent(KeyEvent event) { 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Let the focused view and/or our descendants get the key first 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = super.dispatchKeyEvent(event); 3229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (handled) { 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return executeKeyEvent(event); 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You can call this function yourself to have the scroll view perform 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling from a key event, just as if the event had been dispatched to 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it by the view hierarchy. 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param event The key event to execute. 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Return true if the event was handled, else false. 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean executeKeyEvent(KeyEvent event) { 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.setEmpty(); 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!canScroll()) { 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isFocused()) { 3419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 3429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 3439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, 3449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused, View.FOCUS_DOWN); 3459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocused != null 3469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused != this 3479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && nextFocused.requestFocus(View.FOCUS_DOWN); 3489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 3509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = false; 3539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (event.getAction() == KeyEvent.ACTION_DOWN) { 3549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project switch (event.getKeyCode()) { 3559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_UP: 3569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_UP); 3589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_UP); 3609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_DPAD_DOWN: 3639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!event.isAltPressed()) { 3649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = arrowScroll(View.FOCUS_DOWN); 3659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 3669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = fullScroll(View.FOCUS_DOWN); 3679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case KeyEvent.KEYCODE_SPACE: 3709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project pageScroll(event.isShiftPressed() ? View.FOCUS_UP : View.FOCUS_DOWN); 3719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 3729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 3769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3789f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato private boolean inChild(int x, int y) { 3799f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 3809f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final View child = getChildAt(0); 3819f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return !(y < child.getTop() 3829f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || y >= child.getBottom() 3839f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x < child.getLeft() 3849f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato || x >= child.getRight()); 3859f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 3869f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 3879f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 3889f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 3899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 3909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onInterceptTouchEvent(MotionEvent ev) { 3919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method JUST determines whether we want to intercept the motion. 3939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If we return true, onMotionEvent will be called and we do the actual 3949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * scrolling there. 3959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 3979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 3989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Shortcut the most recurring case: the user is in the dragging 3999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * state and he is moving his finger. We want to intercept this 4009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * motion. 4019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) { 4049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 4059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 407bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 408bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_MOVE: { 4099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * mIsBeingDragged == false, otherwise the shortcut would have caught it. Check 4119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * whether the user has moved far enough from his original down touch. 4129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Locally do absolute value. mLastMotionY is set to the y value 4169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * of the down event. 4179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 418bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = ev.findPointerIndex(mActivePointerId); 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(); 4309f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 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; 456bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 457bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 458bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 4599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 4609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The only time we want to intercept motion events is if we are in the 4649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * drag mode. 4659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return mIsBeingDragged; 4679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 4709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean onTouchEvent(MotionEvent ev) { 4719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { 4739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Don't handle edge touches immediately -- they may actually belong to one of our 4749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // descendants. 4759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 4769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mVelocityTracker == null) { 4799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker = VelocityTracker.obtain(); 4809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mVelocityTracker.addMovement(ev); 4829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 4839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int action = ev.getAction(); 4849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 485bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell switch (action & MotionEvent.ACTION_MASK) { 486bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_DOWN: { 4879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 4889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If being flinged and user touches, stop the fling. isFinished 4899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will be false if being flinged. 4909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 4919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 4929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 4939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 4949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 495bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(); 496bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (!(mIsBeingDragged = inChild((int)ev.getX(), (int)y))) { 4979f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato return false; 4989f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 499bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 5009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Remember where the motion event started 5019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastMotionY = y; 502bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(0); 5039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project break; 504bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 5059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project case MotionEvent.ACTION_MOVE: 5069f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 5079f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato // Scroll to follow the motion event 508bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 509bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final float y = ev.getY(activePointerIndex); 5109f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final int deltaY = (int) (mLastMotionY - y); 5119f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mLastMotionY = y; 5129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 5139f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato overscrollBy(0, deltaY, 0, mScrollY, 0, getScrollRange(), 5149f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 0, getOverscrollMax()); 5159f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 516bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 517bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_UP: 5189f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mIsBeingDragged) { 5199f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final VelocityTracker velocityTracker = mVelocityTracker; 5209f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 521bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell int initialVelocity = (int) velocityTracker.getYVelocity(mActivePointerId); 5229f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato 5239f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (getChildCount() > 0) { 5249f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if ((Math.abs(initialVelocity) > mMinimumVelocity)) { 5259f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato fling(-initialVelocity); 5269f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } else { 5279f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato final int bottom = getScrollRange(); 5289f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mScroller.springback(mScrollX, mScrollY, 0, 0, 0, bottom)) { 5299f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato invalidate(); 5309f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 53117dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 53217dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell } 5339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 534bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = INVALID_POINTER; 535bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mIsBeingDragged = false; 536bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 5379f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato if (mVelocityTracker != null) { 5389f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mVelocityTracker.recycle(); 5399f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato mVelocityTracker = null; 5409f0e8eeab2c9fdce182ad16fb28ad8fa3033eb75Joe Onorato } 5419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 542bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 543bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell case MotionEvent.ACTION_POINTER_UP: 544bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell onSecondaryPointerUp(ev); 545bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell break; 5469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 5489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 5490b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 550bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell private void onSecondaryPointerUp(MotionEvent ev) { 551bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> 552bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell MotionEvent.ACTION_POINTER_INDEX_SHIFT; 553bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int pointerId = ev.getPointerId(pointerIndex); 554bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (pointerId == mActivePointerId) { 555bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // This was our active pointer going up. Choose a new 556bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // active pointer and adjust accordingly. 557bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell // TODO: Make this decision more intelligent. 558bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell final int newPointerIndex = pointerIndex == 0 ? 1 : 0; 559bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mLastMotionY = ev.getY(newPointerIndex); 560bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mActivePointerId = ev.getPointerId(newPointerIndex); 561bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell if (mVelocityTracker != null) { 562bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell mVelocityTracker.clear(); 563bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 564bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 565bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell } 566bc4e7533b9c6a6e45e3cf4a889bcb913b8feefc5Adam Powell 5670b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 5680b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected void onOverscrolled(int scrollX, int scrollY, 5690b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell boolean clampedX, boolean clampedY) { 5700b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell // Treat animating scrolls differently; see #computeScroll() for why. 5710b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (!mScroller.isFinished()) { 5720b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollX = scrollX; 5730b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScrollY = scrollY; 5740b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (clampedY) { 5750b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell mScroller.springback(mScrollX, mScrollY, 0, 0, 0, getScrollRange()); 5760b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5770b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 5780b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell super.scrollTo(scrollX, scrollY); 5790b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5800b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5810b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 5820b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getOverscrollMax() { 5830b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int childCount = getChildCount(); 5840b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int containerOverscroll = (getHeight() - mPaddingBottom - mPaddingTop) / 3; 5850b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (childCount > 0) { 5860b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.min(containerOverscroll, getChildAt(0).getHeight() / 3); 5870b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else { 5880b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return containerOverscroll; 5890b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5900b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5910b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 5920b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell private int getScrollRange() { 5930b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = 0; 5940b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (getChildCount() > 0) { 5950b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell View child = getChildAt(0); 5960b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange = Math.max(0, 5970b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell child.getHeight() - getHeight() - mPaddingBottom - mPaddingTop); 5980b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 5990b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 6000b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 6019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in this View's bounds 6059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * (excluding fading edges) pretending that this View's top is located at 6069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the parameter top. 6079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 6109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 6119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 6129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 6139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found (the fading edge is assumed to start at this position) 6149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param preferredFocusable the View that has highest priority and will be 6159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * returned if it is within my bounds (null is valid) 6169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can be 6179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 6189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInMyBounds(final boolean topFocus, 6209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int top, View preferredFocusable) { 6219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * The fading edge's transparent side should be considered for focus 6239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * since it's mostly visible, so we divide the actual fading edge length 6249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * by 2. 6259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int fadingEdgeLength = getVerticalFadingEdgeLength() / 2; 6279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int topWithoutFadingEdge = top + fadingEdgeLength; 6289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int bottomWithoutFadingEdge = top + getHeight() - fadingEdgeLength; 6299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((preferredFocusable != null) 6319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getTop() < bottomWithoutFadingEdge) 6329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && (preferredFocusable.getBottom() > topWithoutFadingEdge)) { 6339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return preferredFocusable; 6349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return findFocusableViewInBounds(topFocus, topWithoutFadingEdge, 6379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project bottomWithoutFadingEdge); 6389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 6399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 6419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p> 6429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Finds the next focusable component that fits in the specified bounds. 6439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </p> 6449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 6459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param topFocus look for a candidate is the one at the top of the bounds 6469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * if topFocus is true, or at the bottom of the bounds if topFocus is 6479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false 6489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the bounds in which a focusable must be 6499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * found 6509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the bounds in which a focusable must 6519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 6529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the next focusable component in the bounds or null if none can 6539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * be found 6549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private View findFocusableViewInBounds(boolean topFocus, int top, int bottom) { 6569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project List<View> focusables = getFocusables(View.FOCUS_FORWARD); 6589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View focusCandidate = null; 6599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * A fully contained focusable is one where its top is below the bound's 6629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * top, and its bottom is above the bound's bottom. A partially 6639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained focusable is one where some part of it is within the 6649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bounds, but it also has some part that is not within bounds. A fully contained 6659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusable is preferred to a partially contained focusable. 6669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean foundFullyContainedFocusable = false; 6689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = focusables.size(); 6709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < count; i++) { 6719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = focusables.get(i); 6729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewTop = view.getTop(); 6739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int viewBottom = view.getBottom(); 6749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top < viewBottom && viewTop < bottom) { 6769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the focusable is in the target area, it is a candidate for 6789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focusing 6799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 6809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsFullyContained = (top < viewTop) && 6829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (viewBottom < bottom); 6839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (focusCandidate == null) { 6859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* No candidate, take this one */ 6869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 6879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = viewIsFullyContained; 6889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 6899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean viewIsCloserToBoundary = 6909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (topFocus && viewTop < focusCandidate.getTop()) || 6919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project (!topFocus && viewBottom > focusCandidate 6929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project .getBottom()); 6939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 6949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (foundFullyContainedFocusable) { 6959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained && viewIsCloserToBoundary) { 6969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 6979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * We're dealing with only fully contained views, so 6989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * it has to be closer to the boundary to beat our 6999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * candidate 7009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (viewIsFullyContained) { 7059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Any fully contained view beats a partially contained view */ 7069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project foundFullyContainedFocusable = true; 7089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (viewIsCloserToBoundary) { 7099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* 7109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Partially contained view beats another partially 7119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * contained view if it's closer 7129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project focusCandidate = view; 7149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return focusCandidate; 7219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "page up/down" shortcut press. This 7259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view by one page up or down and give the focus 7269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 7279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 7289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 7299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 7319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go one page up or 7329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go one page down 7339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean pageScroll(int direction) { 7369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 7379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 7389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 7409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() + height; 7419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 7429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 7439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 7449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top + height > view.getBottom()) { 7459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = view.getBottom() - height; 7469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 7499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = getScrollY() - height; 7509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mTempRect.top < 0) { 7519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 7529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = mTempRect.top + height; 7559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 7579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Handles scrolling in response to a "home/end" shortcut press. This 7619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * method will scroll the view to the top or bottom and give the focus 7629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to the topmost/bottommost component in the new visible area. If no 7639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * component is a good candidate for focus, this scrollview reclaims the 7649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus.</p> 7659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 7679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go the top of the view or 7689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to go the bottom 7699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 7709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 7719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean fullScroll(int direction) { 7729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean down = direction == View.FOCUS_DOWN; 7739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 7749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = 0; 7769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = height; 7779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (down) { 7799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int count = getChildCount(); 7809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (count > 0) { 7819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View view = getChildAt(count - 1); 7829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.bottom = view.getBottom(); 7839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mTempRect.top = mTempRect.bottom - height; 7849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollAndFocus(direction, mTempRect.top, mTempRect.bottom); 7889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 7899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 7909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 7919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>Scrolls the view to make the area defined by <code>top</code> and 7929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <code>bottom</code> visible. This method attempts to give the focus 7939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to a component visible in this area. If no component can be focused in 7949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the new visible area, the focus is reclaimed by this scrollview.</p> 7959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 7969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction the scroll direction: {@link android.view.View#FOCUS_UP} 7979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to go upward 7989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link android.view.View#FOCUS_DOWN} to downward 7999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param top the top offset of the new area to be made visible 8009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bottom the bottom offset of the new area to be made visible 8019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if the key event is consumed by this method, false otherwise 8029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollAndFocus(int direction, int top, int bottom) { 8049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean handled = true; 8059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 8079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerTop = getScrollY(); 8089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int containerBottom = containerTop + height; 8099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean up = direction == View.FOCUS_UP; 8109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View newFocused = findFocusableViewInBounds(up, top, bottom); 8129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused == null) { 8139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newFocused = this; 8149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (top >= containerTop && bottom <= containerBottom) { 8179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project handled = false; 8189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int delta = up ? (top - containerTop) : (bottom - containerBottom); 8209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(delta); 8219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (newFocused != findFocus() && newFocused.requestFocus(direction)) { 8249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = true; 8259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScrollViewMovedFocus = false; 8269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return handled; 8299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Handle scrolling in response to an up or down arrow click. 8339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 8349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction The direction corresponding to the arrow key that was 8359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pressed 8369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return True if we consumed the event, false otherwise 8379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean arrowScroll(int direction) { 8399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 8419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused == this) currentFocused = null; 8429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 8449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int maxJump = getMaxScrollAmount(); 8469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8477d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (nextFocused != null && isWithinDeltaOfScreen(nextFocused, maxJump, getHeight())) { 8489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.getDrawingRect(mTempRect); 8499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(nextFocused, mTempRect); 8509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 8519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 8529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project nextFocused.requestFocus(direction); 8539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 8549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // no new focus 8559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = maxJump; 8569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 8589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollDelta = getScrollY(); 8599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_DOWN) { 860ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 861ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int daBottom = getChildAt(0).getBottom(); 862ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 863ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int screenBottom = getScrollY() + getHeight(); 864ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 865ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (daBottom - screenBottom < maxJump) { 866ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy scrollDelta = daBottom - screenBottom; 867ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 8689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta == 0) { 8719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 8729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 8749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (currentFocused != null && currentFocused.isFocused() 8779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project && isOffScreen(currentFocused)) { 8789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // previously focused item still has focus and is off screen, give 8799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // it up (take it back to ourselves) 8809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we are 8819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // sure to 8829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get it) 8839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int descendantFocusability = getDescendantFocusability(); // save 8849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 8859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project requestFocus(); 8869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project setDescendantFocusability(descendantFocusability); // restore 8879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 8899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 8929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is scrolled off 8939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * screen. 8949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 8959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isOffScreen(View descendant) { 8967d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra return !isWithinDeltaOfScreen(descendant, 0, getHeight()); 8979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 8989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 8999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return whether the descendant of this scroll view is within delta 9019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * pixels of being on the screen. 9029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9037d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra private boolean isWithinDeltaOfScreen(View descendant, int delta, int height) { 9049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project descendant.getDrawingRect(mTempRect); 9059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(descendant, mTempRect); 9069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (mTempRect.bottom + delta) >= getScrollY() 9087d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra && (mTempRect.top - delta) <= (getScrollY() + height); 9099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Smooth scroll by a Y delta 9139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param delta the number of pixels to scroll by on the Y axis 9159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void doScrollY(int delta) { 9179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (delta != 0) { 9189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mSmoothScrollingEnabled) { 9199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 9209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 9229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link View#scrollBy}, but scroll smoothly instead of immediately. 9289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dx the number of pixels to scroll by on the X axis 9309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param dy the number of pixels to scroll by on the Y axis 9319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollBy(int dx, int dy) { 9333fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell if (getChildCount() == 0) { 9343fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell // Nothing to do. 9353fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell return; 9363fc3737ceb0f5c3b086472fb2cf7ebfb089e1bc8Adam Powell } 9379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll; 9389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (duration > ANIMATED_SCROLL_GAP) { 939f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int height = getHeight() - mPaddingBottom - mPaddingTop; 940f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int bottom = getChildAt(0).getHeight(); 941f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int maxY = Math.max(0, bottom - height); 942f54460576e88d7531b171575d37264dfe0a34f33Adam Powell final int scrollY = mScrollY; 943f54460576e88d7531b171575d37264dfe0a34f33Adam Powell dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY; 944f54460576e88d7531b171575d37264dfe0a34f33Adam Powell 945f54460576e88d7531b171575d37264dfe0a34f33Adam Powell mScroller.startScroll(mScrollX, scrollY, 0, dy); 946f116bf8884b5b58aae261d148003811aa4a7c6e9Mike Cleron awakenScrollBars(mScroller.getDuration()); 9479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project invalidate(); 9489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 9499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScroller.isFinished()) { 9509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mScroller.abortAnimation(); 9519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(dx, dy); 9539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mLastScroll = AnimationUtils.currentAnimationTimeMillis(); 9559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Like {@link #scrollTo}, but scroll smoothly instead of immediately. 9599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 9609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param x the position where to scroll on the X axis 9619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param y the position where to scroll on the Y axis 9629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public final void smoothScrollTo(int x, int y) { 9649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(x - mScrollX, y - mScrollY); 9659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 9689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>The scroll range of a scroll view is the overall height of all of its 9699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * children.</p> 9709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 9719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeVerticalScrollRange() { 973a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int count = getChildCount(); 974a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int contentHeight = getHeight() - mPaddingBottom - mPaddingTop; 9750b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (count == 0) { 976a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell return contentHeight; 9770b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9780b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9790b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell int scrollRange = getChildAt(0).getBottom(); 980a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int scrollY = mScrollY; 981a2f91016840bf4f7274577d40f3610e38b77f2adAdam Powell final int overscrollBottom = Math.max(0, scrollRange - contentHeight); 9820b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (scrollY < 0) { 9830b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange -= scrollY; 9840b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } else if (scrollY > overscrollBottom) { 9850b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell scrollRange += scrollY - overscrollBottom; 9860b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9870b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 9880b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return scrollRange; 9899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 9909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9910b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell @Override 9920b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell protected int computeVerticalScrollOffset() { 9930b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell return Math.max(0, super.computeVerticalScrollOffset()); 9940b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell } 9959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 9969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 9979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) { 9989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project ViewGroup.LayoutParams lp = child.getLayoutParams(); 9999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childWidthMeasureSpec; 10019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int childHeightMeasureSpec; 10029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, mPaddingLeft 10049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + mPaddingRight, lp.width); 10059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 10079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed, 10139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int parentHeightMeasureSpec, int heightUsed) { 10149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 10159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 10179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 10189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project + widthUsed, lp.width); 10199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec( 10209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project lp.topMargin + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 10219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 10239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 10269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void computeScroll() { 10279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mScroller.computeScrollOffset()) { 10289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // This is called at drawing time by ViewGroup. We don't want to 10299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // re-show the scrollbars at this point, which scrollTo will do, 10309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // so we replicate most of scrollTo here. 10319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It's a little odd to call onScrollChanged from inside the drawing. 10339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // It is, except when you remember that computeScroll() is used to 10359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // animate scrolling. So unless we want to defer the onScrollChanged() 10369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // until the end of the animated scrolling, we don't really have a 10379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // choice here. 10389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // I agree. The alternative, which I think would be worse, is to post 10409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // something and tell the subclasses later. This is bad because there 10419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // will be a window where mScrollX/Y is different from what the app 10429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // thinks it is. 10439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // 10449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldX = mScrollX; 10459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int oldY = mScrollY; 10469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int x = mScroller.getCurrX(); 10479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int y = mScroller.getCurrY(); 104817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell 10490b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell if (oldX != x || oldY != y) { 10500b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell overscrollBy(x - oldX, y - oldY, oldX, oldY, 0, getScrollRange(), 10510b8bb4282a7d1afb24f8c4d5beb2ca4ecc731116Adam Powell 0, getOverscrollMax()); 10529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project onScrollChanged(mScrollX, mScrollY, oldX, oldY); 10539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Keep on drawing until the animation has finished. 10569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project postInvalidate(); 10579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Scrolls the view to the given child. 10629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the View to scroll to 10649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private void scrollToChild(View child) { 10669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getDrawingRect(mTempRect); 10679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* Offset from child's local coordinates to ScrollView coordinates */ 10699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(child, mTempRect); 10709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 10729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scrollDelta != 0) { 10749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, scrollDelta); 10759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 10799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * If rect is off screen, scroll just enough to get it (or at least the 10809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * first screen size chunk of it) on screen. 10819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 10829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rectangle. 10839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to scroll immediately without animation 10849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if scrolling was performed 10859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 10869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean scrollToChildRect(Rect rect, boolean immediate) { 10879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int delta = computeScrollDeltaToGetChildRectOnScreen(rect); 10889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final boolean scroll = delta != 0; 10899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (scroll) { 10909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (immediate) { 10919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollBy(0, delta); 10929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 10939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project smoothScrollBy(0, delta); 10949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scroll; 10979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 10989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 10999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compute the amount to scroll in the Y direction in order to get 11019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * a rectangle completely on the screen (or, if taller than the screen, 11029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * at least the first screen size chunk of it). 11039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rect The rect. 11059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return The scroll delta. 11069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected int computeScrollDeltaToGetChildRectOnScreen(Rect rect) { 1108ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() == 0) return 0; 11099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int height = getHeight(); 11119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenTop = getScrollY(); 11129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int screenBottom = screenTop + height; 11139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int fadingEdge = getVerticalFadingEdgeLength(); 11159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for top fading edge as long as rect isn't at very top 11179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.top > 0) { 11189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenTop += fadingEdge; 11199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // leave room for bottom fading edge as long as rect isn't at very bottom 11229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom < getChildAt(0).getHeight()) { 11239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project screenBottom -= fadingEdge; 11249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollYDelta = 0; 11279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.bottom > screenBottom && rect.top > screenTop) { 11299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move down to get it in view: move down just enough so 11309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // that the entire rectangle is in view (or at least the first 11319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk). 11329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 11349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // just enough to get screen size chunk on 11359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.top - screenTop); 11369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // get entire rect at bottom of screen 11389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta += (rect.bottom - screenBottom); 11399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling beyond the end of our content 1142ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getBottom(); 11439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int distanceToBottom = bottom - screenBottom; 11449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 11459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (rect.top < screenTop && rect.bottom < screenBottom) { 11479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // need to move up to get it in view: move up just enough so that 11489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rectangle is in view (or at least the first screen 11499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // size chunk of it). 11509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (rect.height() > height) { 11529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // screen size chunk 11539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenBottom - rect.bottom); 11549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // entire rect at top 11569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta -= (screenTop - rect.top); 11579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // make sure we aren't scrolling any further than the top our content 11609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 11619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollYDelta; 11639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused) { 11679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mScrollViewMovedFocus) { 11689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (!mIsLayoutDirty) { 11699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(focused); 11709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 11719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // The child may not be laid out yet, we can't compute the scroll yet 11729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = focused; 11739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestChildFocus(child, focused); 11769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 11809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * When looking for focus in children of a scroll view, need to be a little 11819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * more careful not to give focus to something that is scrolled off screen. 11829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 11839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is more expensive than the default {@link android.view.ViewGroup} 11849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * implementation, otherwise this behavior might have been made the default. 11859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 11869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 11879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected boolean onRequestFocusInDescendants(int direction, 11889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project Rect previouslyFocusedRect) { 11899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // convert from forward / backward notation to up / down / left / right 11919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // (ugh). 11929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (direction == View.FOCUS_FORWARD) { 11939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_DOWN; 11949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else if (direction == View.FOCUS_BACKWARD) { 11959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project direction = View.FOCUS_UP; 11969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 11979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 11989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final View nextFocus = previouslyFocusedRect == null ? 11999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocus(this, null, direction) : 12009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project FocusFinder.getInstance().findNextFocusFromRect(this, 12019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project previouslyFocusedRect, direction); 12029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (nextFocus == null) { 12049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (isOffScreen(nextFocus)) { 12089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 12099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return nextFocus.requestFocus(direction, previouslyFocusedRect); 12129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 12169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate) { 12179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // offset into coordinate space of this scroll view 12189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project rectangle.offset(child.getLeft() - child.getScrollX(), 12199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project child.getTop() - child.getScrollY()); 12209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return scrollToChildRect(rectangle, immediate); 12229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout() { 12269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = true; 12279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.requestLayout(); 12289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onLayout(boolean changed, int l, int t, int r, int b) { 12329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onLayout(changed, l, t, r, b); 12339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mIsLayoutDirty = false; 12349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Give a child focus if it needs it 12359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) { 12369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollToChild(mChildToScrollTo); 12379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mChildToScrollTo = null; 12399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Calling this with the present values causes it to re-clam them 12419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project scrollTo(mScrollX, mScrollY); 12429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project @Override 12459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project protected void onSizeChanged(int w, int h, int oldw, int oldh) { 12469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.onSizeChanged(w, h, oldw, oldh); 12479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View currentFocused = findFocus(); 12499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (null == currentFocused || this == currentFocused) 12509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return; 12519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12527d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // If the currently-focused view was visible on the screen when the 12537d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // screen was at the old height, then scroll the screen to make that 12547d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra // view visible with the new screen height. 12557d4200d03fa55a13eda63f979dcf47792f0af31dJack Veenstra if (isWithinDeltaOfScreen(currentFocused, 0, oldh)) { 12569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project currentFocused.getDrawingRect(mTempRect); 12579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project offsetDescendantRectToMyCoords(currentFocused, mTempRect); 12589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int scrollDelta = computeScrollDeltaToGetChildRectOnScreen(mTempRect); 12599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project doScrollY(scrollDelta); 12609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Return true if child is an descendant of parent, (or equal to the parent). 12659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private boolean isViewDescendantOf(View child, View parent) { 12679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (child == parent) { 12689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 12699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final ViewParent theParent = child.getParent(); 12729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (theParent instanceof ViewGroup) && isViewDescendantOf((View) theParent, parent); 12739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 12749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 12759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 12769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Fling the scroll view 12779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 12789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param velocityY The initial velocity in the Y direction. Positive 12799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * numbers mean that the finger/curor is moving down the screen, 12809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * which means we want to scroll towards the top. 12819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 12829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void fling(int velocityY) { 1283ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (getChildCount() > 0) { 1284ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int height = getHeight() - mPaddingBottom - mPaddingTop; 1285ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy int bottom = getChildAt(0).getHeight(); 1286ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 128717dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell mScroller.fling(mScrollX, mScrollY, 0, velocityY, 0, 0, 0, 128817dfce15d5c3e7eae7a3c129019f48e7c5f65063Adam Powell Math.max(0, bottom - height), 0, height/2); 1289ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1290ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy final boolean movingDown = velocityY > 0; 1291ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1292ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy View newFocused = 1293ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy findFocusableViewInMyBounds(movingDown, mScroller.getFinalY(), findFocus()); 1294ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused == null) { 1295ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy newFocused = this; 1296ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1297ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1298ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy if (newFocused != findFocus() 1299ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy && newFocused.requestFocus(movingDown ? View.FOCUS_DOWN : View.FOCUS_UP)) { 1300ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = true; 1301ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy mScrollViewMovedFocus = false; 1302ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy } 1303ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy 1304f116bf8884b5b58aae261d148003811aa4a7c6e9Mike Cleron awakenScrollBars(mScroller.getDuration()); 1305ef0e9ae0ddbf70f5e30fbfbffe379e3026b9dc13Romain Guy invalidate(); 13069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 13109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@inheritDoc} 13119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>This version also clamps the scrolling to the bounds of our child. 13139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void scrollTo(int x, int y) { 13159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // we rely on the fact the View.scrollBy calls scrollTo. 13169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (getChildCount() > 0) { 13179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project View child = getChildAt(0); 13189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project x = clamp(x, getWidth() - mPaddingRight - mPaddingLeft, child.getWidth()); 13199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project y = clamp(y, getHeight() - mPaddingBottom - mPaddingTop, child.getHeight()); 13209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (x != mScrollX || y != mScrollY) { 13219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project super.scrollTo(x, y); 13229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 13269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private int clamp(int n, int my, int child) { 13279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (my >= child || n < 0) { 13289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* my >= child is this case: 13299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 13309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 13329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 13339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * or 13359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |--------------- me ---------------| 13369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 13389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * n < 0 is this case: 13399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 13409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-------- child --------| 13419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 13429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return 0; 13449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((my+n) > child) { 13469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /* this case: 13479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ me ------| 13489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |------ child ------| 13499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * |-- mScrollX --| 13509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 13519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return child-my; 13529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return n; 13549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 13559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 1356