1 /*
2  * Copyright (C) 2022 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 com.android.systemui.statusbar.notification.collection.inflation
18 
19 import com.android.systemui.statusbar.notification.collection.NotificationEntry
20 import com.android.systemui.util.ListenerSet
21 
22 /**
23  * Helper class that allows distributing bind events regardless of the pipeline.
24  *
25  * NOTE: This class isn't ideal; this exposes the concept of view inflation as something that can be
26  * globally registered for. This is built as it is to provide compatibility with patterns developed
27  * for the legacy pipeline. Ideally we'd have functionality that needs to know this information be
28  * handled by events that go through the ViewController itself.
29  */
30 open class BindEventManager {
31     protected val listeners = ListenerSet<Listener>()
32 
33     /** Register a listener */
addListenernull34     fun addListener(listener: Listener) =
35         listeners.addIfAbsent(listener)
36 
37     /** Deregister a listener */
38     fun removeListener(listener: Listener) =
39         listeners.remove(listener)
40 
41     /** Listener interface for view bind events */
42     fun interface Listener {
43         fun onViewBound(entry: NotificationEntry)
44     }
45 }
46