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      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      */
     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