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 
17 package com.android.launcher3.accessibility;
18 
19 import android.view.ViewGroup;
20 
21 import com.android.launcher3.CellLayout;
22 import com.android.launcher3.DropTarget.DragObject;
23 import com.android.launcher3.Launcher;
24 import com.android.launcher3.dragndrop.DragController.DragListener;
25 import com.android.launcher3.dragndrop.DragOptions;
26 
27 /**
28  * Utility listener to enable/disable accessibility drag flags for a ViewGroup
29  * containing CellLayouts
30  */
31 public 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      */
AccessibleDragListenerAdapter(ViewGroup parent, int dragType)41     public AccessibleDragListenerAdapter(ViewGroup parent, int dragType) {
42         mViewGroup = parent;
43         mDragType = dragType;
44     }
45 
46     @Override
onDragStart(DragObject dragObject, DragOptions options)47     public void onDragStart(DragObject dragObject, DragOptions options) {
48         enableAccessibleDrag(true);
49     }
50 
51     @Override
onDragEnd()52     public void onDragEnd() {
53         enableAccessibleDrag(false);
54         Launcher.getLauncher(mViewGroup.getContext()).getDragController().removeDragListener(this);
55     }
56 
enableAccessibleDrag(boolean enable)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 
setEnableForLayout(CellLayout layout, boolean enable)63     protected final void setEnableForLayout(CellLayout layout, boolean enable) {
64         layout.enableAccessibleDrag(enable, mDragType);
65     }
66 }
67