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https://github.com/LawnchairLauncher/lawnchair.git
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108 lines
3.7 KiB
Kotlin
108 lines
3.7 KiB
Kotlin
/*
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* Copyright (C) 2023 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.systemui.animation.back
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import android.annotation.IntRange
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import android.os.Build
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import android.util.DisplayMetrics
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import android.view.View
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import android.window.BackEvent
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import android.window.OnBackAnimationCallback
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import android.window.OnBackInvokedDispatcher
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import android.window.OnBackInvokedDispatcher.Priority
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import androidx.annotation.RequiresApi
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/**
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* Generates an [OnBackAnimationCallback] given a [backAnimationSpec]. [onBackProgressed] will be
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* called on each update passing the current [BackTransformation].
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*
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* Optionally, you can specify [onBackStarted], [onBackInvoked], and [onBackCancelled] callbacks.
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*
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* @sample com.android.systemui.util.registerAnimationOnBackInvoked
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*/
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@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
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fun onBackAnimationCallbackFrom(
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backAnimationSpec: BackAnimationSpec,
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displayMetrics: DisplayMetrics, // TODO(b/265060720): We could remove this
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onBackProgressed: (BackTransformation) -> Unit,
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onBackStarted: (BackEvent) -> Unit = {},
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onBackInvoked: () -> Unit = {},
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onBackCancelled: () -> Unit = {},
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): OnBackAnimationCallback {
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return object : OnBackAnimationCallback {
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private var initialY = 0f
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private val lastTransformation = BackTransformation()
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override fun onBackStarted(backEvent: BackEvent) {
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initialY = backEvent.touchY
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onBackStarted(backEvent)
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}
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override fun onBackProgressed(backEvent: BackEvent) {
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val progressY = (backEvent.touchY - initialY) / displayMetrics.heightPixels
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backAnimationSpec.getBackTransformation(
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backEvent = backEvent,
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progressY = progressY,
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result = lastTransformation,
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)
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onBackProgressed(lastTransformation)
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}
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override fun onBackInvoked() {
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onBackInvoked()
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}
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override fun onBackCancelled() {
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onBackCancelled()
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}
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}
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}
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/**
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* Register [OnBackAnimationCallback] when View is attached and unregister it when View is detached
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*
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* @sample com.android.systemui.util.registerAnimationOnBackInvoked
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*/
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@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
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fun View.registerOnBackInvokedCallbackOnViewAttached(
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onBackInvokedDispatcher: OnBackInvokedDispatcher,
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onBackAnimationCallback: OnBackAnimationCallback,
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@Priority @IntRange(from = 0) priority: Int = OnBackInvokedDispatcher.PRIORITY_DEFAULT,
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) {
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addOnAttachStateChangeListener(
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object : View.OnAttachStateChangeListener {
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override fun onViewAttachedToWindow(v: View) {
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onBackInvokedDispatcher.registerOnBackInvokedCallback(
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priority,
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onBackAnimationCallback
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)
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}
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override fun onViewDetachedFromWindow(v: View) {
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removeOnAttachStateChangeListener(this)
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onBackInvokedDispatcher.unregisterOnBackInvokedCallback(onBackAnimationCallback)
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}
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}
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)
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if (isAttachedToWindow) {
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onBackInvokedDispatcher.registerOnBackInvokedCallback(priority, onBackAnimationCallback)
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}
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}
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