/*
* Copyright 2015 Google Inc.
*
* 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.susion.boring.utils;
import android.app.Activity;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.util.Pair;
import android.view.View;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
/**
* Helper class for creating content transitions used with {@link android.app.ActivityOptions}.
*/
public class TransitionHelper {
/**
* Create the transition participants required during a activity transition while
* avoiding glitches with the system UI.
*
* @param activity The activity used as start for the transition.
* @param includeStatusBar If false, the status bar will not be added as the transition
* participant.
* @return All transition participants.
*/
public static Pair<View, String>[] createSafeTransitionParticipants(@NonNull Activity activity,
boolean includeStatusBar, @Nullable Pair... otherParticipants) {
// Avoid system UI glitches as described here:
// https://plus.google.com/+AlexLockwood/posts/RPtwZ5nNebb
View decor = activity.getWindow().getDecorView();
View statusBar = null;
if (includeStatusBar) {
statusBar = decor.findViewById(android.R.id.statusBarBackground);
}
View navBar = decor.findViewById(android.R.id.navigationBarBackground);
// Create pair of transition participants.
List<Pair> participants = new ArrayList<>(3);
addNonNullViewToTransitionParticipants(statusBar, participants);
addNonNullViewToTransitionParticipants(navBar, participants);
// only add transition participants if there's at least one none-null element
if (otherParticipants != null && !(otherParticipants.length == 1
&& otherParticipants[0] == null)) {
participants.addAll(Arrays.asList(otherParticipants));
}
return participants.toArray(new Pair[participants.size()]);
}
private static void addNonNullViewToTransitionParticipants(View view, List<Pair> participants) {
if (view == null) {
return;
}
participants.add(new Pair<>(view, view.getTransitionName()));
}
}