1/* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.launcher3.accessibility; 18 19import android.view.ViewGroup; 20 21import com.android.launcher3.CellLayout; 22import com.android.launcher3.DropTarget.DragObject; 23import com.android.launcher3.Launcher; 24import com.android.launcher3.dragndrop.DragController.DragListener; 25import com.android.launcher3.dragndrop.DragOptions; 26 27/** 28 * Utility listener to enable/disable accessibility drag flags for a ViewGroup 29 * containing CellLayouts 30 */ 31public class AccessibleDragListenerAdapter implements DragListener { 32 33 private final ViewGroup mViewGroup; 34 private final int mDragType; 35 36 /** 37 * @param parent 38 * @param dragType either {@link CellLayout#WORKSPACE_ACCESSIBILITY_DRAG} or 39 * {@link CellLayout#FOLDER_ACCESSIBILITY_DRAG} 40 */ 41 public AccessibleDragListenerAdapter(ViewGroup parent, int dragType) { 42 mViewGroup = parent; 43 mDragType = dragType; 44 } 45 46 @Override 47 public void onDragStart(DragObject dragObject, DragOptions options) { 48 enableAccessibleDrag(true); 49 } 50 51 @Override 52 public void onDragEnd() { 53 enableAccessibleDrag(false); 54 Launcher.getLauncher(mViewGroup.getContext()).getDragController().removeDragListener(this); 55 } 56 57 protected void enableAccessibleDrag(boolean enable) { 58 for (int i = 0; i < mViewGroup.getChildCount(); i++) { 59 setEnableForLayout((CellLayout) mViewGroup.getChildAt(i), enable); 60 } 61 } 62 63 protected final void setEnableForLayout(CellLayout layout, boolean enable) { 64 layout.enableAccessibleDrag(enable, mDragType); 65 } 66} 67