mirror of
https://github.com/LawnchairLauncher/lawnchair.git
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97 lines
3.7 KiB
Kotlin
97 lines
3.7 KiB
Kotlin
/*
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* Copyright (C) 2021 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
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import android.graphics.Rect
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import android.view.View
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/** A view that can expand/launch into an app or a dialog. */
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interface LaunchableView {
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/**
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* Set whether this view should block/postpone all calls to [View.setVisibility]. This ensures
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* that this view:
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* - remains invisible during the launch animation given that it is ghosted and already drawn
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* somewhere else.
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* - remains invisible as long as a dialog expanded from it is shown.
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* - restores its expected visibility once the dialog expanded from it is dismissed.
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*
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* When `setShouldBlockVisibilityChanges(false)` is called, then visibility of the View should
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* be restored to its expected value, i.e. it should have the visibility of the last call to
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* `View.setVisibility()` that was made after `setShouldBlockVisibilityChanges(true)`, if any,
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* or the original view visibility otherwise.
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*
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* Note that calls to [View.setTransitionVisibility] shouldn't be blocked.
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*
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* @param block whether we should block/postpone all calls to `setVisibility`.
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*/
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fun setShouldBlockVisibilityChanges(block: Boolean)
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/** Perform an action when the activity launch animation ends */
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fun onActivityLaunchAnimationEnd() {}
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/** Provide an optional correction applied to the visible area during a launch animation */
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fun getPaddingForLaunchAnimation(): Rect = Rect()
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}
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/** A delegate that can be used by views to make the implementation of [LaunchableView] easier. */
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class LaunchableViewDelegate(
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private val view: View,
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/**
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* The lambda that should set the actual visibility of [view], usually by calling
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* super.setVisibility(visibility).
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*/
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private val superSetVisibility: (Int) -> Unit,
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) : LaunchableView {
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private var blockVisibilityChanges = false
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private var lastVisibility = view.visibility
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/** Call this when [LaunchableView.setShouldBlockVisibilityChanges] is called. */
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override fun setShouldBlockVisibilityChanges(block: Boolean) {
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if (block == blockVisibilityChanges) {
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return
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}
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blockVisibilityChanges = block
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if (block) {
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// Save the current visibility for later.
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lastVisibility = view.visibility
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} else {
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// Restore the visibility. To avoid accessibility issues, we change the visibility twice
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// which makes sure that we trigger a visibility flag change (see b/204944038#comment17
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// for more info).
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if (lastVisibility == View.VISIBLE) {
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superSetVisibility(View.INVISIBLE)
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superSetVisibility(View.VISIBLE)
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} else {
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superSetVisibility(View.VISIBLE)
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superSetVisibility(lastVisibility)
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}
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}
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}
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/** Call this when [View.setVisibility] is called. */
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fun setVisibility(visibility: Int) {
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if (blockVisibilityChanges) {
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lastVisibility = visibility
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return
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}
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superSetVisibility(visibility)
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}
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}
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