BarTransitions.java revision d4e6575c4f664e0d42d9306c9762d96533df429e 
1/*
2 * Copyright (C) 2013 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.statusbar.phone;
18
19import android.animation.ArgbEvaluator;
20import android.animation.ValueAnimator;
21import android.animation.ValueAnimator.AnimatorUpdateListener;
22import android.app.ActivityManager;
23import android.content.Context;
24import android.content.res.Resources;
25import android.graphics.drawable.ColorDrawable;
26import android.graphics.drawable.Drawable;
27import android.util.Log;
28import android.view.View;
29
30import com.android.systemui.R;
31
32public class BarTransitions {
33    private static final boolean DEBUG = false;
34
35    public static final int MODE_OPAQUE = 0;
36    public static final int MODE_SEMI_TRANSPARENT = 1;
37    public static final int MODE_TRANSPARENT = 2;
38
39    private final String mTag;
40    protected final View mTarget;
41    protected final int mOpaque;
42    protected final int mSemiTransparent;
43
44    protected Drawable mTransparent;
45    private int mMode;
46    private ValueAnimator mBackgroundColorAnimator;
47
48    private final AnimatorUpdateListener mBackgroundColorListener = new AnimatorUpdateListener() {
49        @Override
50        public void onAnimationUpdate(ValueAnimator animator) {
51            mTarget.setBackgroundColor((Integer) animator.getAnimatedValue());
52        }
53    };
54
55    public BarTransitions(Context context, View target) {
56        mTag = "BarTransitions." + target.getClass().getSimpleName();
57        mTarget = target;
58        final Resources res = context.getResources();
59        mOpaque = res.getColor(R.drawable.status_bar_background);
60        mSemiTransparent = res.getColor(R.color.status_bar_background_semi_transparent);
61    }
62
63    public int getMode() {
64        return mMode;
65    }
66
67    public void transitionTo(int mode, boolean animate) {
68        if (mMode == mode) return;
69        int oldMode = mMode;
70        mMode = mode;
71        if (!ActivityManager.isHighEndGfx()) return;
72        if (DEBUG) Log.d(mTag, modeToString(oldMode) + " -> " + modeToString(mode));
73        onTransition(oldMode, mMode, animate);
74    }
75
76    protected Integer getBackgroundColor(int mode) {
77        if (mode == MODE_SEMI_TRANSPARENT) return mSemiTransparent;
78        if (mode == MODE_OPAQUE) return mOpaque;
79        return null;
80    }
81
82    protected void onTransition(int oldMode, int newMode, boolean animate) {
83        cancelBackgroundColorAnimation();
84        Integer oldColor = getBackgroundColor(oldMode);
85        Integer newColor = getBackgroundColor(newMode);
86        if (oldColor != null && newColor != null) {
87            if (animate) {
88                startBackgroundColorAnimation(oldColor, newColor);
89            } else {
90                mTarget.setBackgroundColor(newColor);
91            }
92        } else {
93            mTarget.setBackground(newMode == MODE_TRANSPARENT ? mTransparent
94                    : newMode == MODE_SEMI_TRANSPARENT ? new ColorDrawable(mSemiTransparent)
95                    : new ColorDrawable(mOpaque));
96        }
97    }
98
99    private void startBackgroundColorAnimation(int from, int to) {
100        mBackgroundColorAnimator = ValueAnimator.ofObject(new ArgbEvaluator(), from, to);
101        mBackgroundColorAnimator.addUpdateListener(mBackgroundColorListener);
102        mBackgroundColorAnimator.start();
103    }
104
105    private void cancelBackgroundColorAnimation() {
106        if (mBackgroundColorAnimator != null && mBackgroundColorAnimator.isStarted()) {
107            mBackgroundColorAnimator.cancel();
108            mBackgroundColorAnimator = null;
109        }
110    }
111
112    public static String modeToString(int mode) {
113        if (mode == MODE_OPAQUE) return "MODE_OPAQUE";
114        if (mode == MODE_SEMI_TRANSPARENT) return "MODE_SEMI_TRANSPARENT";
115        if (mode == MODE_TRANSPARENT) return "MODE_TRANSPARENT";
116        throw new IllegalArgumentException("Unknown mode " + mode);
117    }
118}
119