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 distributed under the
11  * License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
12  * KIND, either express or implied. See the License for the specific language governing
13  * permissions and limitations under the License.
14  */
15 package com.android.systemui.unfold.updates.hinge
16 
17 import androidx.core.util.Consumer
18 import com.android.systemui.unfold.util.CallbackController
19 
20 /**
21  * Emits device hinge angle values (angle between two integral parts of the device).
22  *
23  * The hinge angle could be from 0 to 360 degrees inclusive. For foldable devices usually 0
24  * corresponds to fully closed (folded) state and 180 degrees corresponds to fully open (flat)
25  * state.
26  */
27 interface HingeAngleProvider : CallbackController<Consumer<Float>> {
startnull28     fun start()
29     fun stop()
30 }
31 
32 const val FULLY_OPEN_DEGREES = 180f
33 const val FULLY_CLOSED_DEGREES = 0f
34