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/*
* Copyright (C) 2015 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.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.os.Bundle;
import android.util.SparseArray;
import android.view.View;
import android.view.View.AccessibilityDelegate;
import android.view.accessibility.AccessibilityNodeInfo;
import android.view.accessibility.AccessibilityNodeInfo.AccessibilityAction;
import com.android.launcher3.R;
import com.android.launcher3.Utilities;
import com.android.launcher3.Workspace;
@TargetApi(Build.VERSION_CODES.LOLLIPOP)
public class OverviewScreenAccessibilityDelegate extends AccessibilityDelegate {
private static final int MOVE_BACKWARD = R.id.action_move_screen_backwards;
private static final int MOVE_FORWARD = R.id.action_move_screen_forwards;
private final SparseArray<AccessibilityAction> mActions = new SparseArray<>();
private final Workspace mWorkspace;
public OverviewScreenAccessibilityDelegate(Workspace workspace) {
mWorkspace = workspace;
Context context = mWorkspace.getContext();
boolean isRtl = Utilities.isRtl(context.getResources());
mActions.put(MOVE_BACKWARD, new AccessibilityAction(MOVE_BACKWARD,
context.getText(isRtl ? R.string.action_move_screen_right :
R.string.action_move_screen_left)));
mActions.put(MOVE_FORWARD, new AccessibilityAction(MOVE_FORWARD,
context.getText(isRtl ? R.string.action_move_screen_left :
R.string.action_move_screen_right)));
}
@Override
public boolean performAccessibilityAction(View host, int action, Bundle args) {
if (host != null) {
if (action == AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS ) {
int index = mWorkspace.indexOfChild(host);
mWorkspace.setCurrentPage(index);
} else if (action == MOVE_FORWARD) {
movePage(mWorkspace.indexOfChild(host) + 1, host);
return true;
} else if (action == MOVE_BACKWARD) {
movePage(mWorkspace.indexOfChild(host) - 1, host);
return true;
}
}
return super.performAccessibilityAction(host, action, args);
}
private void movePage(int finalIndex, View view) {
mWorkspace.onStartReordering();
mWorkspace.removeView(view);
mWorkspace.addView(view, finalIndex);
mWorkspace.onEndReordering();
mWorkspace.announceForAccessibility(mWorkspace.getContext().getText(R.string.screen_moved));
mWorkspace.updateAccessibilityFlags();
view.performAccessibilityAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS, null);
}
@Override
public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(host, info);
int index = mWorkspace.indexOfChild(host);
if (index < mWorkspace.getChildCount() - 1) {
info.addAction(mActions.get(MOVE_FORWARD));
}
if (index > mWorkspace.numCustomPages()) {
info.addAction(mActions.get(MOVE_BACKWARD));
}
}
}
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