BarTransitions.java revision 3b139a9ed06fdaad694ca97b8f99e7038007a054 
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    private final View mTarget;
41    private final int mOpaque;
42    private final int mSemiTransparent;
43
44    protected Drawable mTransparent;
45    private int mMode;
46
47    private final AnimatorUpdateListener mBackgroundColorListener = new AnimatorUpdateListener() {
48        @Override
49        public void onAnimationUpdate(ValueAnimator animator) {
50            mTarget.setBackgroundColor((Integer) animator.getAnimatedValue());
51        }
52    };
53
54    public BarTransitions(Context context, View target) {
55        mTag = "BarTransitions." + target.getClass().getSimpleName();
56        mTarget = target;
57        final Resources res = context.getResources();
58        mOpaque = res.getColor(R.drawable.status_bar_background);
59        mSemiTransparent = res.getColor(R.color.status_bar_background_semi_transparent);
60    }
61
62    public void setTransparent(Drawable transparent) {
63        mTransparent = transparent;
64        if (mMode == MODE_TRANSPARENT) {
65            transitionTo(MODE_TRANSPARENT);
66        }
67    }
68
69    public void transitionTo(int mode) {
70        transitionTo(mode, false);
71    }
72
73    public void transitionTo(int mode, boolean animate) {
74        if (mMode == mode) return;
75        int oldMode = mMode;
76        mMode = mode;
77        if (!ActivityManager.isHighEndGfx()) return;
78        if (DEBUG) Log.d(mTag, modeToString(oldMode) + " -> " + modeToString(mode));
79        onTransition(oldMode, mMode, animate);
80    }
81
82    protected void onTransition(int oldMode, int newMode, boolean animate) {
83        if (animate && oldMode == MODE_SEMI_TRANSPARENT && newMode == MODE_OPAQUE) {
84            startColorAnimation(mSemiTransparent, mOpaque);
85        } else if (animate && oldMode == MODE_OPAQUE && newMode == MODE_SEMI_TRANSPARENT) {
86            startColorAnimation(mOpaque, mSemiTransparent);
87        } else if (newMode == MODE_OPAQUE || newMode == MODE_SEMI_TRANSPARENT) {
88            mTarget.setBackgroundColor(newMode == MODE_OPAQUE ? mOpaque : mSemiTransparent);
89        } else {
90            mTarget.setBackground(newMode == MODE_TRANSPARENT? mTransparent
91                    : newMode == MODE_SEMI_TRANSPARENT ? new ColorDrawable(mSemiTransparent)
92                    : new ColorDrawable(mOpaque));
93        }
94    }
95
96    private void startColorAnimation(int from, int to) {
97        ValueAnimator anim = ValueAnimator.ofObject(new ArgbEvaluator(), from, to);
98        anim.addUpdateListener(mBackgroundColorListener);
99        anim.start();
100    }
101
102    public static String modeToString(int mode) {
103        if (mode == MODE_OPAQUE) return "MODE_OPAQUE";
104        if (mode == MODE_SEMI_TRANSPARENT) return "MODE_SEMI_TRANSPARENT";
105        if (mode == MODE_TRANSPARENT) return "MODE_TRANSPARENT";
106        throw new IllegalArgumentException("Unknown mode " + mode);
107    }
108}
109