1 /*
2  * Copyright (C) 2024 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.permissioncontroller.permission.ui.wear.elements.rotaryinput
18 
19 import androidx.compose.ui.input.pointer.util.VelocityTracker1D
20 
21 // This file is a copy of RotaryVelocityTracker.kt from Horologist (go/horologist),
22 // remove it once Wear Compose 1.4 is landed (b/325560444).
23 
24 /** A wrapper around VelocityTracker1D to provide support for rotary input. */
25 class RotaryVelocityTracker {
26     private var velocityTracker: VelocityTracker1D = VelocityTracker1D(true)
27 
28     /** Retrieve the last computed velocity. */
29     val velocity: Float
30         get() = velocityTracker.calculateVelocity()
31 
32     /** Start tracking motion. */
startnull33     fun start(currentTime: Long) {
34         velocityTracker.resetTracking()
35         velocityTracker.addDataPoint(currentTime, 0f)
36     }
37 
38     /** Continue tracking motion as the input rotates. */
movenull39     fun move(currentTime: Long, delta: Float) {
40         velocityTracker.addDataPoint(currentTime, delta)
41     }
42 
43     /** Stop tracking motion. */
endnull44     fun end() {
45         velocityTracker.resetTracking()
46     }
47 }
48