1/*
2 * Copyright (C) 2012 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 */
16package android.view;
17
18import com.android.ide.common.rendering.api.LayoutLog;
19import com.android.layoutlib.bridge.Bridge;
20import com.android.tools.layoutlib.annotations.LayoutlibDelegate;
21import com.android.tools.layoutlib.java.System_Delegate;
22
23import java.lang.reflect.Field;
24import java.util.concurrent.atomic.AtomicReference;
25
26/**
27 * Delegate used to provide new implementation of a select few methods of {@link Choreographer}
28 *
29 * Through the layoutlib_create tool, the original  methods of Choreographer have been
30 * replaced by calls to methods of the same name in this delegate class.
31 *
32 */
33public class Choreographer_Delegate {
34    static final AtomicReference<Choreographer> mInstance = new AtomicReference<Choreographer>();
35
36    @LayoutlibDelegate
37    public static Choreographer getInstance() {
38        if (mInstance.get() == null) {
39            mInstance.compareAndSet(null, Choreographer.getInstance_Original());
40        }
41
42        return mInstance.get();
43    }
44
45    @LayoutlibDelegate
46    public static float getRefreshRate() {
47        return 60.f;
48    }
49
50    @LayoutlibDelegate
51    static void scheduleVsyncLocked(Choreographer thisChoreographer) {
52        // do nothing
53    }
54
55    public static void doFrame(long frameTimeNanos) {
56        Choreographer thisChoreographer = Choreographer.getInstance();
57
58        thisChoreographer.mLastFrameTimeNanos = frameTimeNanos - thisChoreographer
59                .getFrameIntervalNanos();
60        thisChoreographer.mFrameInfo.markInputHandlingStart();
61        thisChoreographer.doCallbacks(Choreographer.CALLBACK_INPUT, frameTimeNanos);
62
63        thisChoreographer.mFrameInfo.markAnimationsStart();
64        thisChoreographer.doCallbacks(Choreographer.CALLBACK_ANIMATION, frameTimeNanos);
65
66        thisChoreographer.mFrameInfo.markPerformTraversalsStart();
67        thisChoreographer.doCallbacks(Choreographer.CALLBACK_TRAVERSAL, frameTimeNanos);
68
69        thisChoreographer.doCallbacks(Choreographer.CALLBACK_COMMIT, frameTimeNanos);
70    }
71
72    public static void dispose() {
73        try {
74            Field threadInstanceField = Choreographer.class.getDeclaredField("sThreadInstance");
75            threadInstanceField.setAccessible(true);
76            @SuppressWarnings("unchecked") ThreadLocal<Choreographer> threadInstance =
77                    (ThreadLocal<Choreographer>) threadInstanceField.get(null);
78            threadInstance.remove();
79        } catch (ReflectiveOperationException e) {
80            assert false;
81            Bridge.getLog().error(LayoutLog.TAG_BROKEN,
82                    "Unable to clear Choreographer memory.", e, null);
83        }
84    }
85}
86