1 /*
2  * Copyright (C) 2023 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 
17 package androidx.window.extensions.area;
18 
19 import android.app.Presentation;
20 import android.content.Context;
21 import android.view.Display;
22 import android.view.View;
23 
24 import androidx.annotation.NonNull;
25 import androidx.window.extensions.core.util.function.Consumer;
26 
27 /**
28  * {@link Presentation} object that is used to present extra content
29  * on the rear facing display when in a rear display presentation feature.
30  */
31 class RearDisplayPresentation extends Presentation implements ExtensionWindowAreaPresentation {
32 
33     @NonNull
34     private final Consumer<@WindowAreaComponent.WindowAreaSessionState Integer> mStateConsumer;
35 
RearDisplayPresentation(@onNull Context outerContext, @NonNull Display display, @NonNull Consumer<@WindowAreaComponent.WindowAreaSessionState Integer> stateConsumer)36     RearDisplayPresentation(@NonNull Context outerContext, @NonNull Display display,
37             @NonNull Consumer<@WindowAreaComponent.WindowAreaSessionState Integer> stateConsumer) {
38         super(outerContext, display);
39         mStateConsumer = stateConsumer;
40     }
41 
42     /**
43      * {@code mStateConsumer} is notified that their content is now visible when the
44      * {@link Presentation} object is started. There is no comparable callback for
45      * {@link WindowAreaComponent#SESSION_STATE_CONTENT_INVISIBLE} in {@link #onStop()} due to the
46      * timing of when a {@link android.hardware.devicestate.DeviceStateRequest} is cancelled
47      * ending rear display presentation mode happening before the {@link Presentation} is stopped.
48      */
49     @Override
onStart()50     protected void onStart() {
51         super.onStart();
52         mStateConsumer.accept(WindowAreaComponent.SESSION_STATE_CONTENT_VISIBLE);
53     }
54 
55     @NonNull
56     @Override
getPresentationContext()57     public Context getPresentationContext() {
58         return getContext();
59     }
60 
61     @Override
setPresentationView(View view)62     public void setPresentationView(View view) {
63         setContentView(view);
64         if (!isShowing()) {
65             show();
66         }
67     }
68 }
69