AnimationThread.java revision 2eea6fab1cbb0a5c8f913491c2d622c904759893 
1/*
2 * Copyright (C) 2010 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.layoutlib.bridge.impl;
18
19import com.android.layoutlib.api.SceneResult;
20import com.android.layoutlib.api.LayoutScene.IAnimationListener;
21
22import android.animation.Animator;
23import android.animation.ValueAnimator;
24import android.os.Handler;
25import android.os.Handler_Delegate;
26import android.os.Message;
27import android.os.Handler_Delegate.IHandlerCallback;
28
29import java.util.LinkedList;
30import java.util.Queue;
31
32public class AnimationThread extends Thread {
33
34    private static class MessageBundle {
35        final Handler mTarget;
36        final Message mMessage;
37        final long mUptimeMillis;
38
39        MessageBundle(Handler target, Message message, long uptimeMillis) {
40            mTarget = target;
41            mMessage = message;
42            mUptimeMillis = uptimeMillis;
43        }
44    }
45
46    private final LayoutSceneImpl mScene;
47    private final Animator mAnimator;
48
49    Queue<MessageBundle> mQueue = new LinkedList<MessageBundle>();
50    private final IAnimationListener mListener;
51
52    public AnimationThread(LayoutSceneImpl scene, Animator animator, IAnimationListener listener) {
53        mScene = scene;
54        mAnimator = animator;
55        mListener = listener;
56    }
57
58    @Override
59    public void run() {
60        mScene.prepareThread();
61        try {
62            Handler_Delegate.setCallback(new IHandlerCallback() {
63                public void sendMessageAtTime(Handler handler, Message msg, long uptimeMillis) {
64                    if (msg.what == ValueAnimator.ANIMATION_START ||
65                            msg.what == ValueAnimator.ANIMATION_FRAME) {
66                        mQueue.add(new MessageBundle(handler, msg, uptimeMillis));
67                    } else {
68                        // just ignore.
69                    }
70                }
71            });
72
73            // start the animation. This will send a message to the handler right away, so
74            // mQueue is filled when this method returns.
75            mAnimator.start();
76
77            // loop the animation
78            do {
79                // get the next message.
80                MessageBundle bundle = mQueue.poll();
81                if (bundle == null) {
82                    break;
83                }
84
85                // sleep enough for this bundle to be on time
86                long currentTime = System.currentTimeMillis();
87                if (currentTime < bundle.mUptimeMillis) {
88                    try {
89                        sleep(bundle.mUptimeMillis - currentTime);
90                    } catch (InterruptedException e) {
91                        // TODO Auto-generated catch block
92                        e.printStackTrace();
93                    }
94                }
95
96                // ready to do the work, acquire the scene.
97                SceneResult result = mScene.acquire(250);
98                if (result != SceneResult.SUCCESS) {
99                    mListener.done(result);
100                    return;
101                }
102
103                // process the bundle. If the animation is not finished, this will enqueue
104                // the next message, so mQueue will have another one.
105                try {
106                    bundle.mTarget.handleMessage(bundle.mMessage);
107                    if (mScene.render() == SceneResult.SUCCESS) {
108                        mListener.onNewFrame(mScene.getImage());
109                    }
110                } finally {
111                    mScene.release();
112                }
113            } while (mQueue.size() > 0);
114
115            mListener.done(SceneResult.SUCCESS);
116        } finally {
117            Handler_Delegate.setCallback(null);
118            mScene.cleanupThread();
119        }
120    }
121}
122