1 /*
<lambda>null2  * 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.systemui.animation.back
18 
19 import android.util.DisplayMetrics
20 import android.view.animation.Interpolator
21 import com.android.app.animation.Interpolators
22 import com.android.systemui.util.dpToPx
23 
24 private const val MAX_SCALE_DELTA_DP = 48
25 
26 /** Create a [BackAnimationSpec] from [displayMetrics] and design specs. */
27 fun BackAnimationSpec.Companion.createBottomsheetAnimationSpec(
28     displayMetricsProvider: () -> DisplayMetrics,
29     scaleEasing: Interpolator = Interpolators.BACK_GESTURE,
30 ): BackAnimationSpec {
31     return BackAnimationSpec { backEvent, _, result ->
32         val displayMetrics = displayMetricsProvider()
33         val screenWidthPx = displayMetrics.widthPixels
34         val minScale = 1 - MAX_SCALE_DELTA_DP.dpToPx(displayMetrics) / screenWidthPx
35         val progressX = backEvent.progress
36         val ratioScale = scaleEasing.getInterpolation(progressX)
37         result.apply {
38             scale = 1f - ratioScale * (1f - minScale)
39             scalePivotPosition = ScalePivotPosition.BOTTOM_CENTER
40         }
41     }
42 }
43