79 lines
2.6 KiB
Kotlin
79 lines
2.6 KiB
Kotlin
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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package org.mozilla.fenix.utils
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import android.view.View
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.delay
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import kotlinx.coroutines.launch
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import org.mozilla.fenix.components.FenixSnackbar
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import org.mozilla.fenix.ext.settings
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import java.util.concurrent.atomic.AtomicBoolean
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internal const val UNDO_DELAY = 3000L
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internal const val ACCESSIBLE_UNDO_DELAY = 15000L
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/**
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* Runs [operation] after giving user time (see [UNDO_DELAY]) to cancel it.
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* In case of cancellation, [onCancel] is executed.
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*
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* Execution of suspend blocks happens on [Dispatchers.Main].
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*
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* @param view A [View] used to determine a parent for the [FenixSnackbar].
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* @param message A message displayed as part of [FenixSnackbar].
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* @param undoActionTitle Label for the action associated with the [FenixSnackbar].
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* @param onCancel A suspend block to execute in case of cancellation.
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* @param operation A suspend block to execute if user doesn't cancel via the displayed [FenixSnackbar].
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* @param anchorView A [View] to which [FenixSnackbar] should be anchored.
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*/
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@Suppress("LongParameterList")
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fun CoroutineScope.allowUndo(
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view: View,
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message: String,
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undoActionTitle: String,
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onCancel: suspend () -> Unit = {},
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operation: suspend () -> Unit,
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anchorView: View? = null
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) {
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// By using an AtomicBoolean, we achieve memory effects of reading and
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// writing a volatile variable.
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val requestedUndo = AtomicBoolean(false)
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fun showUndoSnackbar() {
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val snackbar = FenixSnackbar
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.make(view, FenixSnackbar.LENGTH_INDEFINITE)
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.setText(message)
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.setAnchorView(anchorView)
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.setAction(undoActionTitle) {
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requestedUndo.set(true)
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launch {
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onCancel.invoke()
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}
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}
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snackbar.show()
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// Wait a bit, and if user didn't request cancellation, proceed with
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// requested operation and hide the snackbar.
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launch {
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val lengthToDelay = if (view.context.settings().accessibilityServicesEnabled) {
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ACCESSIBLE_UNDO_DELAY
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} else {
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UNDO_DELAY
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}
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delay(lengthToDelay)
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if (!requestedUndo.get()) {
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snackbar.dismiss()
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operation.invoke()
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}
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}
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}
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showUndoSnackbar()
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}
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