core/java/com/android/internal/transition/ActionBarTransition.java

/*
 * Copyright (C) 2013 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.internal.transition;

import android.transition.ChangeBounds;
import android.transition.Fade;
import android.transition.ChangeText;
import android.transition.Transition;
import android.transition.TransitionManager;
import android.transition.TransitionSet;
import android.view.ViewGroup;

public class ActionBarTransition {

    private static boolean TRANSITIONS_ENABLED = false;

    private static final int TRANSITION_DURATION = 120; // ms

    private static final Transition sTransition;

    static {
        if (TRANSITIONS_ENABLED) {
            final ChangeText tc = new ChangeText();
            tc.setChangeBehavior(ChangeText.CHANGE_BEHAVIOR_OUT_IN);
            final TransitionSet inner = new TransitionSet();
            inner.addTransition(tc).addTransition(new ChangeBounds());
            final TransitionSet tg = new TransitionSet();
            tg.addTransition(new Fade(Fade.OUT)).addTransition(inner).
                    addTransition(new Fade(Fade.IN));
            tg.setOrdering(TransitionSet.ORDERING_SEQUENTIAL);
            tg.setDuration(TRANSITION_DURATION);
            sTransition = tg;
        } else {
            sTransition = null;
        }
    }

    public static void beginDelayedTransition(ViewGroup sceneRoot) {
        if (TRANSITIONS_ENABLED) {
            TransitionManager.beginDelayedTransition(sceneRoot, sTransition);
        }
    }
}