| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.launcher3.accessibility; |
| |
| import android.view.View; |
| import android.view.ViewGroup; |
| import android.view.ViewGroup.OnHierarchyChangeListener; |
| |
| import com.android.launcher3.CellLayout; |
| import com.android.launcher3.DropTarget.DragObject; |
| import com.android.launcher3.Launcher; |
| import com.android.launcher3.dragndrop.DragController.DragListener; |
| import com.android.launcher3.dragndrop.DragOptions; |
| |
| import java.util.function.Function; |
| |
| /** |
| * Utility listener to enable/disable accessibility drag flags for a ViewGroup |
| * containing CellLayouts |
| */ |
| public class AccessibleDragListenerAdapter implements DragListener, OnHierarchyChangeListener { |
| |
| private final ViewGroup mViewGroup; |
| private final Function<CellLayout, DragAndDropAccessibilityDelegate> mDelegateFactory; |
| |
| /** |
| * @param parent the viewgroup containing all the children |
| * @param delegateFactory function to create no delegates |
| */ |
| public AccessibleDragListenerAdapter(ViewGroup parent, |
| Function<CellLayout, DragAndDropAccessibilityDelegate> delegateFactory) { |
| mViewGroup = parent; |
| mDelegateFactory = delegateFactory; |
| } |
| |
| @Override |
| public void onDragStart(DragObject dragObject, DragOptions options) { |
| mViewGroup.setOnHierarchyChangeListener(this); |
| enableAccessibleDrag(true); |
| } |
| |
| @Override |
| public void onDragEnd() { |
| mViewGroup.setOnHierarchyChangeListener(null); |
| enableAccessibleDrag(false); |
| Launcher.getLauncher(mViewGroup.getContext()).getDragController().removeDragListener(this); |
| } |
| |
| |
| @Override |
| public void onChildViewAdded(View parent, View child) { |
| if (parent == mViewGroup) { |
| setEnableForLayout((CellLayout) child, true); |
| } |
| } |
| |
| @Override |
| public void onChildViewRemoved(View parent, View child) { |
| if (parent == mViewGroup) { |
| setEnableForLayout((CellLayout) child, false); |
| } |
| } |
| |
| protected void enableAccessibleDrag(boolean enable) { |
| for (int i = 0; i < mViewGroup.getChildCount(); i++) { |
| setEnableForLayout((CellLayout) mViewGroup.getChildAt(i), enable); |
| } |
| } |
| |
| protected final void setEnableForLayout(CellLayout layout, boolean enable) { |
| layout.setDragAndDropAccessibilityDelegate(enable ? mDelegateFactory.apply(layout) : null); |
| } |
| } |