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.view; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199de95db4f28f88c37b1443d20b308ce02407fd74Chris Craikimport android.annotation.NonNull; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.graphics.Rect; 21b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powellimport android.os.Bundle; 22736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganovimport android.view.accessibility.AccessibilityEvent; 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Defines the responsibilities for a class that will be a parent of a View. 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This is the API that a view sees when it wants to interact with its parent. 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic interface ViewParent { 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when something has changed which has invalidated the layout of a 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * child of this view parent. This will schedule a layout pass of the view 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * tree. 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestLayout(); 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Indicates whether layout was requested on this view parent. 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return true if layout was requested, false otherwise 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean isLayoutRequested(); 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when a child wants the view hierarchy to gather and report 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * transparent regions to the window compositor. Views that "punch" holes in 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the view hierarchy, such as SurfaceView can use this API to improve 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * performance of the system. When no such a view is present in the 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * hierarchy, this optimization in unnecessary and might slightly reduce the 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * view hierarchy performance. 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child the view requesting the transparent region computation 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestTransparentRegion(View child); 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 579de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik 589de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik /** 599de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * The target View has been invalidated, or has had a drawing property changed that 609de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * requires the hierarchy to re-render. 619de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * 629de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * This method is called by the View hierarchy to signal ancestors that a View either needs to 639de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * re-record its drawing commands, or drawing properties have changed. This is how Views 649de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * schedule a drawing traversal. 659de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * 669de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * This signal is generally only dispatched for attached Views, since only they need to draw. 679de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * 689de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * @param child Direct child of this ViewParent containing target 699de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * @param target The view that needs to redraw 709de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik */ 719de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik default void onDescendantInvalidated(@NonNull View child, @NonNull View target) { 729de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik if (getParent() != null) { 739de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik // Note: should pass 'this' as default, but can't since we may not be a View 749de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik getParent().onDescendantInvalidated(child, target); 759de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik } 769de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik } 779de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * All or part of a child is dirty and needs to be redrawn. 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child The child which is dirty 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param r The area within the child that is invalid 839de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * 849de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * @deprecated Use {@link #onDescendantInvalidated(View, View)} instead. 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 869de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik @Deprecated 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void invalidateChild(View child, Rect r); 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * All or part of a child is dirty and needs to be redrawn. 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 92cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <p>The location array is an array of two int values which respectively 93cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * define the left and the top position of the dirty child.</p> 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 95cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <p>This method must return the parent of this ViewParent if the specified 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * rectangle must be invalidated in the parent. If the specified rectangle 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * does not require invalidation in the parent or if the parent does not 98cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * exist, this method must return null.</p> 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 100cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <p>When this method returns a non-null value, the location array must 101cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * have been updated with the left and top coordinates of this ViewParent.</p> 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param location An array of 2 ints containing the left and top 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * coordinates of the child to invalidate 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param r The area within the child that is invalid 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return the parent of this ViewParent or null 1089de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * 1099de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik * @deprecated Use {@link #onDescendantInvalidated(View, View)} instead. 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1119de95db4f28f88c37b1443d20b308ce02407fd74Chris Craik @Deprecated 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ViewParent invalidateChildInParent(int[] location, Rect r); 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Returns the parent if it exists, or null. 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return a ViewParent or null if this ViewParent does not have a parent 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public ViewParent getParent(); 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when a child of this parent wants focus 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child The child of this ViewParent that wants focus. This view 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * will contain the focused view. It is not necessarily the view that 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * actually has focus. 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param focused The view that is a descendant of child that actually has 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * focus 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestChildFocus(View child, View focused); 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Tell view hierarchy that the global view attributes need to be 1349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * re-evaluated. 1359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child View whose attributes have changed. 1379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void recomputeViewAttributes(View child); 1399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when a child of this parent is giving up focus 1429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child The view that is giving up focus 1449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void clearChildFocus(View child); 1469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 147cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne /** 148cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * Compute the visible part of a rectangular region defined in terms of a child view's 149cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * coordinates. 150cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * 151cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <p>Returns the clipped visible part of the rectangle <code>r</code>, defined in the 152cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <code>child</code>'s local coordinate system. <code>r</code> is modified by this method to 153cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * contain the result, expressed in the global (root) coordinate system.</p> 154cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * 155cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <p>The resulting rectangle is always axis aligned. If a rotation is applied to a node in the 156cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * View hierarchy, the result is the axis-aligned bounding box of the visible rectangle.</p> 157cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * 158cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * @param child A child View, whose rectangular visible region we want to compute 159cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * @param r The input rectangle, defined in the child coordinate system. Will be overwritten to 160cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * contain the resulting visible rectangle, expressed in global (root) coordinates 161cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * @param offset The input coordinates of a point, defined in the child coordinate system. 162cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * As with the <code>r</code> parameter, this will be overwritten to contain the global (root) 163cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * coordinates of that point. 164cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * A <code>null</code> value is valid (in case you are not interested in this result) 165cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * @return true if the resulting rectangle is not empty, false otherwise 166cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne */ 1679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset); 1689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Find the nearest view in the specified direction that wants to take focus 1719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param v The view that currently has focus 1739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 1749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public View focusSearch(View v, int direction); 1769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 178b5ced2200767280026ee57857edaebc02d081216Vadim Tryshev * Find the nearest keyboard navigation cluster in the specified direction. 179b5ced2200767280026ee57857edaebc02d081216Vadim Tryshev * This does not actually give focus to that cluster. 18001b0c9ed4e173f0c140a6575049e2964ae1a919fVadim Tryshev * 181b5ced2200767280026ee57857edaebc02d081216Vadim Tryshev * @param currentCluster The starting point of the search. Null means the current cluster is not 182b5ced2200767280026ee57857edaebc02d081216Vadim Tryshev * found yet 18301b0c9ed4e173f0c140a6575049e2964ae1a919fVadim Tryshev * @param direction Direction to look 18401b0c9ed4e173f0c140a6575049e2964ae1a919fVadim Tryshev * 185b5ced2200767280026ee57857edaebc02d081216Vadim Tryshev * @return The nearest keyboard navigation cluster in the specified direction, or null if none 18601b0c9ed4e173f0c140a6575049e2964ae1a919fVadim Tryshev * can be found 18701b0c9ed4e173f0c140a6575049e2964ae1a919fVadim Tryshev */ 188b5ced2200767280026ee57857edaebc02d081216Vadim Tryshev View keyboardNavigationClusterSearch(View currentCluster, int direction); 18901b0c9ed4e173f0c140a6575049e2964ae1a919fVadim Tryshev 19001b0c9ed4e173f0c140a6575049e2964ae1a919fVadim Tryshev /** 1910187a5d424c8618709b8f11dd7200caa0178c40eChet Haase * Change the z order of the child so it's on top of all other children. 1920187a5d424c8618709b8f11dd7200caa0178c40eChet Haase * This ordering change may affect layout, if this container 193cb96db8d144a01aa41ec396247c548d8aa496131Chet Haase * uses an order-dependent layout scheme (e.g., LinearLayout). Prior 194e8222dddaf2e3da14380101e818d4254899e0c0dChet Haase * to {@link android.os.Build.VERSION_CODES#KITKAT} this 1950187a5d424c8618709b8f11dd7200caa0178c40eChet Haase * method should be followed by calls to {@link #requestLayout()} and 196cb96db8d144a01aa41ec396247c548d8aa496131Chet Haase * {@link View#invalidate()} on this parent to force the parent to redraw 197cb96db8d144a01aa41ec396247c548d8aa496131Chet Haase * with the new child ordering. 1989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1990187a5d424c8618709b8f11dd7200caa0178c40eChet Haase * @param child The child to bring to the top of the z order 2009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void bringChildToFront(View child); 2029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Tells the parent that a new focusable view has become available. This is 2059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * to handle transitions from the case where there are no focusable views to 2069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the case where the first focusable view appears. 2079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param v The view that has become newly focusable 2099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void focusableViewAvailable(View v); 2119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 213021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * Shows the context menu for the specified view or its ancestors. 214021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * <p> 215021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * In most cases, a subclass does not need to override this. However, if 2169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * the subclass is added directly to the window manager (for example, 2179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link ViewManager#addView(View, android.view.ViewGroup.LayoutParams)}) 218021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * then it should override this and show the context menu. 219021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * 220021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * @param originalView the source view where the context menu was first 221021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * invoked 222021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * @return {@code true} if the context menu was shown, {@code false} 223021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * otherwise 224021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * @see #showContextMenuForChild(View, float, float) 2259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean showContextMenuForChild(View originalView); 2279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 229021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * Shows the context menu for the specified view or its ancestors anchored 230021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * to the specified view-relative coordinate. 231021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * <p> 232021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * In most cases, a subclass does not need to override this. However, if 233021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * the subclass is added directly to the window manager (for example, 234021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * {@link ViewManager#addView(View, android.view.ViewGroup.LayoutParams)}) 235021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * then it should override this and show the context menu. 2362af189a0a7962501b808cd50499d978a7cd10d81Adam Powell * <p> 2372af189a0a7962501b808cd50499d978a7cd10d81Adam Powell * If a subclass overrides this method it should also override 2382af189a0a7962501b808cd50499d978a7cd10d81Adam Powell * {@link #showContextMenuForChild(View)}. 239ed3912692f0ba8a647d795462e20fcdb67adbacbOren Blasberg * 240021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * @param originalView the source view where the context menu was first 241021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * invoked 242021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * @param x the X coordinate in pixels relative to the original view to 24323e282d297193655ce5a4b716312f0a985b27d50Oren Blasberg * which the menu should be anchored, or {@link Float#NaN} to 24423e282d297193655ce5a4b716312f0a985b27d50Oren Blasberg * disable anchoring 245021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * @param y the Y coordinate in pixels relative to the original view to 24623e282d297193655ce5a4b716312f0a985b27d50Oren Blasberg * which the menu should be anchored, or {@link Float#NaN} to 24723e282d297193655ce5a4b716312f0a985b27d50Oren Blasberg * disable anchoring 248021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * @return {@code true} if the context menu was shown, {@code false} 249021627eb5875372dea57ba91fa782fffbfbbc559Alan Viverette * otherwise 250ed3912692f0ba8a647d795462e20fcdb67adbacbOren Blasberg */ 2512af189a0a7962501b808cd50499d978a7cd10d81Adam Powell boolean showContextMenuForChild(View originalView, float x, float y); 252ed3912692f0ba8a647d795462e20fcdb67adbacbOren Blasberg 253ed3912692f0ba8a647d795462e20fcdb67adbacbOren Blasberg /** 2549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Have the parent populate the specified context menu if it has anything to 2559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * add (and then recurse on its parent). 2569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param menu The menu to populate 2589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 2599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void createContextMenu(ContextMenu menu); 2609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 2619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 2624423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * Start an action mode for the specified view with the default type 2634423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * {@link ActionMode#TYPE_PRIMARY}. 264cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * 265cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <p>In most cases, a subclass does not need to override this. However, if the 2666e34636749217654f43221885afb7a29bb5ca96aAdam Powell * subclass is added directly to the window manager (for example, 2676e34636749217654f43221885afb7a29bb5ca96aAdam Powell * {@link ViewManager#addView(View, android.view.ViewGroup.LayoutParams)}) 268cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * then it should override this and start the action mode.</p> 2696e34636749217654f43221885afb7a29bb5ca96aAdam Powell * 2706e34636749217654f43221885afb7a29bb5ca96aAdam Powell * @param originalView The source view where the action mode was first invoked 2716e34636749217654f43221885afb7a29bb5ca96aAdam Powell * @param callback The callback that will handle lifecycle events for the action mode 2726e34636749217654f43221885afb7a29bb5ca96aAdam Powell * @return The new action mode if it was started, null otherwise 2734423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * 2744423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int) 2756e34636749217654f43221885afb7a29bb5ca96aAdam Powell */ 2766e34636749217654f43221885afb7a29bb5ca96aAdam Powell public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback); 2776e34636749217654f43221885afb7a29bb5ca96aAdam Powell 2786e34636749217654f43221885afb7a29bb5ca96aAdam Powell /** 2794423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * Start an action mode of a specific type for the specified view. 2804423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * 2814423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * <p>In most cases, a subclass does not need to override this. However, if the 2824423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * subclass is added directly to the window manager (for example, 2834423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * {@link ViewManager#addView(View, android.view.ViewGroup.LayoutParams)}) 2844423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * then it should override this and start the action mode.</p> 2854423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * 2864423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * @param originalView The source view where the action mode was first invoked 2874423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * @param callback The callback that will handle lifecycle events for the action mode 2884423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * @param type One of {@link ActionMode#TYPE_PRIMARY} or {@link ActionMode#TYPE_FLOATING}. 2894423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri * @return The new action mode if it was started, null otherwise 2904423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri */ 2914423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri public ActionMode startActionModeForChild( 2924423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri View originalView, ActionMode.Callback callback, int type); 2934423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri 2944423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri /** 2959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * This method is called on the parent when a child's drawable state 2969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * has changed. 2979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 2989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child The child whose drawable state has changed. 2999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void childDrawableStateChanged(View child); 3014423d91de5300d3fd318bf5bc2d4d7e5bb856abfClara Bayarri 3029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when a child does not want this parent and its ancestors to 3049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * intercept touch events with 3059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link ViewGroup#onInterceptTouchEvent(MotionEvent)}. 306cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * 307cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * <p>This parent should pass this call onto its parents. This parent must obey 3089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * this request for the duration of the touch (that is, only clear the flag 309cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * after this parent has received an up or a cancel.</p> 3109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param disallowIntercept True if the child does not want the parent to 3129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * intercept touch events. 3139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public void requestDisallowInterceptTouchEvent(boolean disallowIntercept); 315d62d5e9accc76952d737f9c58a97f898807713e5Yigit Boyar 3169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 3179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Called when a child of this group wants a particular rectangle to be 3189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * positioned onto the screen. {@link ViewGroup}s overriding this can trust 3199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * that: 3209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <ul> 3219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li>child will be a direct child of this group</li> 322d62d5e9accc76952d737f9c58a97f898807713e5Yigit Boyar * <li>rectangle will be in the child's content coordinates</li> 3239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * </ul> 3249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <p>{@link ViewGroup}s overriding this should uphold the contract:</p> 3269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <ul> 3279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li>nothing will change if the rectangle is already visible</li> 3289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <li>the view port will be scrolled only just enough to make the 3299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * rectangle visible</li> 3309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * <ul> 3319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param child The direct child making the request. 3339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param rectangle The rectangle in the child's coordinates the child 3349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * wishes to be on the screen. 3359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param immediate True to forbid animated or delayed scrolling, 3369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * false otherwise 3379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return Whether the group scrolled to handle the operation 3389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 3399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public boolean requestChildRectangleOnScreen(View child, Rect rectangle, 3409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project boolean immediate); 341736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov 342736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov /** 343736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * Called by a child to request from its parent to send an {@link AccessibilityEvent}. 344736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * The child has already populated a record for itself in the event and is delegating 345736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * to its parent to send the event. The parent can optionally add a record for itself. 346736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * <p> 347736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * Note: An accessibility event is fired by an individual view which populates the 348736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * event with a record for its state and requests from its parent to perform 349736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * the sending. The parent can optionally add a record for itself before 350736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * dispatching the request to its parent. A parent can also choose not to 351736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * respect the request for sending the event. The accessibility event is sent 352cea45132e3d5d32a6fc737abf10b8893a50f465bGilles Debunne * by the topmost view in the view tree.</p> 353736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * 354736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * @param child The child which requests sending the event. 355736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * @param event The event to be sent. 356736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov * @return True if the event was sent. 357736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov */ 358736c2756bf3c14ae9fef7255c119057f7a2be1edSvetoslav Ganov public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event); 359539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell 360539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell /** 361539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell * Called when a child view now has or no longer is tracking transient state. 362539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell * 3630da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * <p>"Transient state" is any state that a View might hold that is not expected to 3640da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * be reflected in the data model that the View currently presents. This state only 3650da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * affects the presentation to the user within the View itself, such as the current 3660da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * state of animations in progress or the state of a text selection operation.</p> 3670da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * 3680da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * <p>Transient state is useful for hinting to other components of the View system 3690da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * that a particular view is tracking something complex but encapsulated. 3700da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * A <code>ListView</code> for example may acknowledge that list item Views 3710da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * with transient state should be preserved within their position or stable item ID 3720da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * instead of treating that view as trivially replaceable by the backing adapter. 3730da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * This allows adapter implementations to be simpler instead of needing to track 3740da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * the state of item view animations in progress such that they could be restored 3750da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * in the event of an unexpected recycling and rebinding of attached item views.</p> 3760da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * 3770da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * <p>This method is called on a parent view when a child view or a view within 3780da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * its subtree begins or ends tracking of internal transient state.</p> 3790da4a282eec40364d54f9e658632c5aab85142b7Adam Powell * 380539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell * @param child Child view whose state has changed 381539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell * @param hasTransientState true if this child has transient state 382539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell */ 383539ee8716b4f81260bab2e9f3dc5d88d81c99985Adam Powell public void childHasTransientStateChanged(View child, boolean hasTransientState); 3843a3a6cfd8ec12208ca75c0d0d871d19d76c34194Dianne Hackborn 3853a3a6cfd8ec12208ca75c0d0d871d19d76c34194Dianne Hackborn /** 3863a3a6cfd8ec12208ca75c0d0d871d19d76c34194Dianne Hackborn * Ask that a new dispatch of {@link View#fitSystemWindows(Rect) 3873a3a6cfd8ec12208ca75c0d0d871d19d76c34194Dianne Hackborn * View.fitSystemWindows(Rect)} be performed. 3883a3a6cfd8ec12208ca75c0d0d871d19d76c34194Dianne Hackborn */ 3893a3a6cfd8ec12208ca75c0d0d871d19d76c34194Dianne Hackborn public void requestFitSystemWindows(); 3904213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov 3914213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov /** 3924213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov * Gets the parent of a given View for accessibility. Since some Views are not 3934213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov * exposed to the accessibility layer the parent for accessibility is not 3944213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov * necessarily the direct parent of the View, rather it is a predecessor. 3954213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov * 3964213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov * @return The parent or <code>null</code> if no such is found. 3974213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov */ 3984213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov public ViewParent getParentForAccessibility(); 3994213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov 4004213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov /** 40177e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * Notifies a view parent that the accessibility state of one of its 40277e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * descendants has changed and that the structure of the subtree is 40377e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * different. 40477e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * @param child The direct child whose subtree has changed. 40563e4503991b52862efb17d42950d986dca90976bPhil Weaver * @param source The descendant view that changed. May not be {@code null}. 40677e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * @param changeType A bit mask of the types of changes that occurred. One 40777e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * or more of: 40877e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * <ul> 40977e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION} 41077e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_SUBTREE} 41177e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_TEXT} 41277e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_UNDEFINED} 41377e9a28e2faa36f127231b842476d47f9823a83aAlan Viverette * </ul> 4144213804541a8b05cd0587b138a2fd9a3b7fd9350Svetoslav Ganov */ 41563e4503991b52862efb17d42950d986dca90976bPhil Weaver public void notifySubtreeAccessibilityStateChanged( 41663e4503991b52862efb17d42950d986dca90976bPhil Weaver View child, @NonNull View source, int changeType); 4179dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4189dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4199dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Tells if this view parent can resolve the layout direction. 4209dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * See {@link View#setLayoutDirection(int)} 4219dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4229dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return True if this view parent can resolve the layout direction. 4239dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4249dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public boolean canResolveLayoutDirection(); 4259dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4269dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4279dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Tells if this view parent layout direction is resolved. 4289dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * See {@link View#setLayoutDirection(int)} 4299dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4309dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return True if this view parent layout direction is resolved. 4319dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4329dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public boolean isLayoutDirectionResolved(); 4339dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4349dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4359dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Return this view parent layout direction. See {@link View#getLayoutDirection()} 4369dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4379dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return {@link View#LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4389dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 4399dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4409dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public int getLayoutDirection(); 4419dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4429dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4439dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Tells if this view parent can resolve the text direction. 4449dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * See {@link View#setTextDirection(int)} 4459dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4469dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return True if this view parent can resolve the text direction. 4479dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4489dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public boolean canResolveTextDirection(); 4499dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4509dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4519dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Tells if this view parent text direction is resolved. 4529dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * See {@link View#setTextDirection(int)} 4539dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4549dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return True if this view parent text direction is resolved. 4559dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4569dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public boolean isTextDirectionResolved(); 4579dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4589dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4599dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Return this view parent text direction. See {@link View#getTextDirection()} 4609dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4619dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return the resolved text direction. Returns one of: 4629dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4639dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_DIRECTION_FIRST_STRONG} 4649dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_DIRECTION_ANY_RTL}, 4659dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_DIRECTION_LTR}, 4669dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_DIRECTION_RTL}, 4679dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_DIRECTION_LOCALE} 4689dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4699dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public int getTextDirection(); 4709dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4719dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4729dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Tells if this view parent can resolve the text alignment. 4739dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * See {@link View#setTextAlignment(int)} 4749dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4759dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return True if this view parent can resolve the text alignment. 4769dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4779dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public boolean canResolveTextAlignment(); 4789dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4799dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4809dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Tells if this view parent text alignment is resolved. 4819dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * See {@link View#setTextAlignment(int)} 4829dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4839dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return True if this view parent text alignment is resolved. 4849dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4859dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public boolean isTextAlignmentResolved(); 4869dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio 4879dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio /** 4889dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * Return this view parent text alignment. See {@link android.view.View#getTextAlignment()} 4899dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4909dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * @return the resolved text alignment. Returns one of: 4919dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * 4929dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_ALIGNMENT_GRAVITY}, 4939dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_ALIGNMENT_CENTER}, 4949dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_ALIGNMENT_TEXT_START}, 4959dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_ALIGNMENT_TEXT_END}, 4969dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_ALIGNMENT_VIEW_START}, 4979dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio * {@link View#TEXT_ALIGNMENT_VIEW_END} 4989dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio */ 4999dd4c5c6867f8b6de19096d2d68365dccb744c19Fabrice Di Meglio public int getTextAlignment(); 50010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 50110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 50210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * React to a descendant view initiating a nestable scroll operation, claiming the 50310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * nested scroll operation if appropriate. 50410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 50510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>This method will be called in response to a descendant view invoking 50610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * {@link View#startNestedScroll(int)}. Each parent up the view hierarchy will be 50710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * given an opportunity to respond and claim the nested scrolling operation by returning 50810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <code>true</code>.</p> 50910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 51010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>This method may be overridden by ViewParent implementations to indicate when the view 51110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * is willing to support a nested scrolling operation that is about to begin. If it returns 51210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * true, this ViewParent will become the target view's nested scrolling parent for the duration 51310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * of the scroll operation in progress. When the nested scroll is finished this ViewParent 51410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * will receive a call to {@link #onStopNestedScroll(View)}. 51510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * </p> 51610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 51710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param child Direct child of this ViewParent containing target 51810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param target View that initiated the nested scroll 51910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param nestedScrollAxes Flags consisting of {@link View#SCROLL_AXIS_HORIZONTAL}, 52010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * {@link View#SCROLL_AXIS_VERTICAL} or both 52110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @return true if this ViewParent accepts the nested scroll operation 52210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 52310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes); 52410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 52510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 52610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * React to the successful claiming of a nested scroll operation. 52710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 52810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>This method will be called after 52910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * {@link #onStartNestedScroll(View, View, int) onStartNestedScroll} returns true. It offers 53010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * an opportunity for the view and its superclasses to perform initial configuration 53110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * for the nested scroll. Implementations of this method should always call their superclass's 53210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * implementation of this method if one is present.</p> 53310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 53410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param child Direct child of this ViewParent containing target 53510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param target View that initiated the nested scroll 53610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param nestedScrollAxes Flags consisting of {@link View#SCROLL_AXIS_HORIZONTAL}, 53710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * {@link View#SCROLL_AXIS_VERTICAL} or both 53810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @see #onStartNestedScroll(View, View, int) 53910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @see #onStopNestedScroll(View) 54010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 54110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onNestedScrollAccepted(View child, View target, int nestedScrollAxes); 54210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 54310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 54410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * React to a nested scroll operation ending. 54510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 54610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>Perform cleanup after a nested scrolling operation. 54710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * This method will be called when a nested scroll stops, for example when a nested touch 54810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * scroll ends with a {@link MotionEvent#ACTION_UP} or {@link MotionEvent#ACTION_CANCEL} event. 54910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * Implementations of this method should always call their superclass's implementation of this 55010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * method if one is present.</p> 55110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 55210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param target View that initiated the nested scroll 55310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 55410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onStopNestedScroll(View target); 55510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 55610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 55710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * React to a nested scroll in progress. 55810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 55910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>This method will be called when the ViewParent's current nested scrolling child view 56010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * dispatches a nested scroll event. To receive calls to this method the ViewParent must have 56110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * previously returned <code>true</code> for a call to 56210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * {@link #onStartNestedScroll(View, View, int)}.</p> 56310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 56410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>Both the consumed and unconsumed portions of the scroll distance are reported to the 56510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * ViewParent. An implementation may choose to use the consumed portion to match or chase scroll 56610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * position of multiple child elements, for example. The unconsumed portion may be used to 56710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * allow continuous dragging of multiple scrolling or draggable elements, such as scrolling 56810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * a list within a vertical drawer where the drawer begins dragging once the edge of inner 56910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * scrolling content is reached.</p> 57010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 57110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param target The descendent view controlling the nested scroll 57210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param dxConsumed Horizontal scroll distance in pixels already consumed by target 57310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param dyConsumed Vertical scroll distance in pixels already consumed by target 57410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param dxUnconsumed Horizontal scroll distance in pixels not consumed by target 57510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param dyUnconsumed Vertical scroll distance in pixels not consumed by target 57610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 57710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 57810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell int dxUnconsumed, int dyUnconsumed); 57910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 58010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 58110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * React to a nested scroll in progress before the target view consumes a portion of the scroll. 58210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 58310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>When working with nested scrolling often the parent view may want an opportunity 58410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * to consume the scroll before the nested scrolling child does. An example of this is a 58510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * drawer that contains a scrollable list. The user will want to be able to scroll the list 58610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * fully into view before the list itself begins scrolling.</p> 58710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 58810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p><code>onNestedPreScroll</code> is called when a nested scrolling child invokes 58910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * {@link View#dispatchNestedPreScroll(int, int, int[], int[])}. The implementation should 59010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * report how any pixels of the scroll reported by dx, dy were consumed in the 59110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <code>consumed</code> array. Index 0 corresponds to dx and index 1 corresponds to dy. 59210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * This parameter will never be null. Initial values for consumed[0] and consumed[1] 59310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * will always be 0.</p> 59410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 59510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param target View that initiated the nested scroll 59610ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param dx Horizontal scroll distance in pixels 59710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param dy Vertical scroll distance in pixels 59810ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param consumed Output. The horizontal and vertical scroll distance consumed by this parent 59910ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 60010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell public void onNestedPreScroll(View target, int dx, int dy, int[] consumed); 60110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell 60210ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell /** 60310ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * Request a fling from a nested scroll. 60410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 605b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * <p>This method signifies that a nested scrolling child has detected suitable conditions 606b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * for a fling. Generally this means that a touch scroll has ended with a 607b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * {@link VelocityTracker velocity} in the direction of scrolling that meets or exceeds 608b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * the {@link ViewConfiguration#getScaledMinimumFlingVelocity() minimum fling velocity} 609b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * along a scrollable axis.</p> 610b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * 61110ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * <p>If a nested scrolling child view would normally fling but it is at the edge of 612b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * its own content, it can use this method to delegate the fling to its nested scrolling 613b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * parent instead. The parent may optionally consume the fling or observe a child fling.</p> 61410ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * 61510ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param target View that initiated the nested scroll 616b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * @param velocityX Horizontal velocity in pixels per second 61710ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell * @param velocityY Vertical velocity in pixels per second 618b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * @param consumed true if the child consumed the fling, false otherwise 619b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell * @return true if this parent consumed or otherwise reacted to the fling 62010ba27734ee6274a772be8d6b1faa703ee3a3d6bAdam Powell */ 621b36e4f944fe28ce68182f9ec91e5341866b49084Adam Powell public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed); 622b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell 623b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell /** 624b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * React to a nested fling before the target view consumes it. 625b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * 626b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * <p>This method siginfies that a nested scrolling child has detected a fling with the given 627b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * velocity along each axis. Generally this means that a touch scroll has ended with a 628b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * {@link VelocityTracker velocity} in the direction of scrolling that meets or exceeds 629b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * the {@link ViewConfiguration#getScaledMinimumFlingVelocity() minimum fling velocity} 630b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * along a scrollable axis.</p> 631b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * 632b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * <p>If a nested scrolling parent is consuming motion as part of a 633b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * {@link #onNestedPreScroll(View, int, int, int[]) pre-scroll}, it may be appropriate for 634b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * it to also consume the pre-fling to complete that same motion. By returning 635b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * <code>true</code> from this method, the parent indicates that the child should not 636b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * fling its own internal content as well.</p> 637b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * 638b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * @param target View that initiated the nested scroll 639b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * @param velocityX Horizontal velocity in pixels per second 640b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * @param velocityY Vertical velocity in pixels per second 641b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell * @return true if this parent consumed the fling ahead of the target view 642b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell */ 643b72be59a6a5ca5fae3ede2470f1662598098b666Adam Powell public boolean onNestedPreFling(View target, float velocityX, float velocityY); 644b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell 645b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell /** 646b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * React to an accessibility action delegated by a target descendant view before the target 647b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * processes it. 648b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * 649b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * <p>This method may be called by a target descendant view if the target wishes to give 650b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * a view in its parent chain a chance to react to the event before normal processing occurs. 651b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * Most commonly this will be a scroll event such as 652b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * {@link android.view.accessibility.AccessibilityNodeInfo#ACTION_SCROLL_FORWARD}. 653b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * A ViewParent that supports acting as a nested scrolling parent should override this 654b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * method and act accordingly to implement scrolling via accesibility systems.</p> 655b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * 656b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * @param target The target view dispatching this action 657b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * @param action Action being performed; see 658b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * {@link android.view.accessibility.AccessibilityNodeInfo} 659b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * @param arguments Optional action arguments 660b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell * @return true if the action was consumed by this ViewParent 661b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell */ 662b6ab098bad4b126eaaaa3aaa5a512fefc4e0749bAdam Powell public boolean onNestedPrePerformAccessibilityAction(View target, int action, Bundle arguments); 6639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 664