1/*
2 * Copyright (C) 2015 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.camera.captureintent.state;
18
19import com.google.common.annotations.VisibleForTesting;
20import com.google.common.base.Optional;
21
22import com.android.camera.async.RefCountBase;
23import com.android.camera.captureintent.resource.ResourceConstructed;
24import com.android.camera.captureintent.resource.ResourceSurfaceTexture;
25import com.android.camera.captureintent.stateful.EventHandler;
26import com.android.camera.captureintent.event.EventOnSurfaceTextureDestroyed;
27import com.android.camera.captureintent.event.EventResume;
28import com.android.camera.captureintent.stateful.State;
29import com.android.camera.captureintent.stateful.StateImpl;
30
31/**
32 * Represents a state that module is inactive in background but surface texture
33 * is available.
34 * <p>
35 * Module is in this state when first run dialog is still presented. The module
36 * will be resumed after people finish first run dialog (b/19531554).
37 */
38public class StateBackgroundWithSurfaceTexture extends StateImpl {
39    private final RefCountBase<ResourceConstructed> mResourceConstructed;
40    private final RefCountBase<ResourceSurfaceTexture> mResourceSurfaceTexture;
41
42    /**
43     * Used to transition from StateOpeningCamera, StateStartingPreview and
44     * StateReadyForCapture on module got paused.
45     */
46    public static StateBackgroundWithSurfaceTexture from(
47            State previousState,
48            RefCountBase<ResourceConstructed> resourceConstructed,
49            RefCountBase<ResourceSurfaceTexture> resourceSurfaceTexture) {
50        return new StateBackgroundWithSurfaceTexture(
51                previousState, resourceConstructed, resourceSurfaceTexture);
52    }
53
54    private StateBackgroundWithSurfaceTexture(
55            State previousState,
56            RefCountBase<ResourceConstructed> resourceConstructed,
57            RefCountBase<ResourceSurfaceTexture> resourceSurfaceTexture) {
58        super(previousState);
59        mResourceConstructed = resourceConstructed;
60        mResourceConstructed.addRef();     // Will be balanced in onLeave().
61        mResourceSurfaceTexture = resourceSurfaceTexture;
62        mResourceSurfaceTexture.addRef();  // Will be balanced in onLeave().
63        registerEventHandlers();
64    }
65
66    private void registerEventHandlers() {
67        /** Handles EventResume. */
68        EventHandler<EventResume> resumeHandler = new EventHandler<EventResume>() {
69            @Override
70            public Optional<State> processEvent(EventResume eventResume) {
71                return Optional.of((State) StateForegroundWithSurfaceTexture.from(
72                        StateBackgroundWithSurfaceTexture.this,
73                        mResourceConstructed,
74                        mResourceSurfaceTexture));
75            }
76        };
77        setEventHandler(EventResume.class, resumeHandler);
78
79        /** Handles EventOnSurfaceTextureDestroyed. */
80        EventHandler<EventOnSurfaceTextureDestroyed> surfaceTextureDestroyedHandler =
81                new EventHandler<EventOnSurfaceTextureDestroyed>() {
82                    @Override
83                    public Optional<State> processEvent(EventOnSurfaceTextureDestroyed event) {
84                        return Optional.of((State) StateBackground.from(
85                                StateBackgroundWithSurfaceTexture.this, mResourceConstructed));
86                    }
87                };
88        setEventHandler(
89                EventOnSurfaceTextureDestroyed.class, surfaceTextureDestroyedHandler);
90    }
91
92    @Override
93    public Optional<State> onEnter() {
94        // Do nothing unless the module is resumed.
95        return Optional.absent();
96    }
97
98    @Override
99    public void onLeave() {
100        mResourceConstructed.close();
101        mResourceSurfaceTexture.close();
102    }
103
104    @VisibleForTesting
105    public RefCountBase<ResourceSurfaceTexture> getResourceSurfaceTexture() {
106        return mResourceSurfaceTexture;
107    }
108}
109