SystemBarScrimViews.java revision 8873754f66527d2cc9feab295dd4eef23298212a 
1/*
2 * Copyright (C) 2014 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
17package com.android.systemui.recents.views;
18
19import android.animation.AnimatorListenerAdapter;
20import android.app.Activity;
21import android.content.Context;
22import android.view.View;
23import android.view.ViewPropertyAnimator;
24
25import com.android.systemui.Interpolators;
26import com.android.systemui.R;
27import com.android.systemui.recents.events.activity.DismissRecentsToHomeAnimationStarted;
28import com.android.systemui.recents.events.activity.EnterRecentsWindowAnimationCompletedEvent;
29
30/** Manages the scrims for the various system bars. */
31public class SystemBarScrimViews {
32
33    Context mContext;
34
35    View mNavBarScrimView;
36
37    boolean mHasNavBarScrim;
38    boolean mShouldAnimateNavBarScrim;
39
40    int mNavBarScrimEnterDuration;
41
42    public SystemBarScrimViews(Activity activity) {
43        mContext = activity;
44        mNavBarScrimView = activity.findViewById(R.id.nav_bar_scrim);
45        mNavBarScrimEnterDuration = activity.getResources().getInteger(
46                R.integer.recents_nav_bar_scrim_enter_duration);
47    }
48
49    /**
50     * Prepares the scrim views for animating when entering Recents. This will be called before
51     * the first draw.
52     */
53    public void prepareEnterRecentsAnimation(boolean hasNavBarScrim, boolean animateNavBarScrim) {
54        mHasNavBarScrim = hasNavBarScrim;
55        mShouldAnimateNavBarScrim = animateNavBarScrim;
56
57        mNavBarScrimView.setVisibility(mHasNavBarScrim && !mShouldAnimateNavBarScrim ?
58                View.VISIBLE : View.INVISIBLE);
59    }
60
61    /**
62     * Animates the nav bar scrim visibility.
63     */
64    public void animateNavBarScrimVisibility(boolean visible, AnimationProps animation) {
65        int toY = 0;
66        if (visible) {
67            mNavBarScrimView.setVisibility(View.VISIBLE);
68            mNavBarScrimView.setTranslationY(mNavBarScrimView.getMeasuredHeight());
69        } else {
70            toY = mNavBarScrimView.getMeasuredHeight();
71        }
72        if (animation != AnimationProps.IMMEDIATE) {
73            mNavBarScrimView.animate()
74                    .translationY(toY)
75                    .setDuration(animation.getDuration(AnimationProps.BOUNDS))
76                    .setInterpolator(animation.getInterpolator(AnimationProps.BOUNDS))
77                    .start();
78        } else {
79            mNavBarScrimView.setTranslationY(toY);
80        }
81    }
82
83    /**** EventBus events ****/
84
85    /**
86     * Starts animating the scrim views when entering Recents.
87     */
88    public final void onBusEvent(EnterRecentsWindowAnimationCompletedEvent event) {
89        if (mHasNavBarScrim) {
90            AnimationProps animation = mShouldAnimateNavBarScrim
91                    ? new AnimationProps()
92                            .setDuration(AnimationProps.BOUNDS, mNavBarScrimEnterDuration)
93                            .setInterpolator(AnimationProps.BOUNDS, Interpolators.DECELERATE_QUINT)
94                    : AnimationProps.IMMEDIATE;
95            animateNavBarScrimVisibility(true, animation);
96        }
97    }
98
99    /**
100     * Starts animating the scrim views when leaving Recents (either via launching a task, or
101     * going home).
102     */
103    public final void onBusEvent(DismissRecentsToHomeAnimationStarted event) {
104        if (mHasNavBarScrim) {
105            AnimationProps animation = new AnimationProps()
106                    .setDuration(AnimationProps.BOUNDS,
107                            TaskStackAnimationHelper.EXIT_TO_HOME_TRANSLATION_DURATION)
108                    .setInterpolator(AnimationProps.BOUNDS, Interpolators.FAST_OUT_SLOW_IN);
109            animateNavBarScrimVisibility(false, animation);
110        }
111    }
112}
113