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BackButtonCancellationEventSource.kt
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BackButtonCancellationEventSource.kt
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/*
* Copyright (C) 2022 Hadi Satrio
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.hadisatrio.libs.android.foundation.widget
import androidx.activity.ComponentActivity
import androidx.activity.OnBackPressedCallback
import androidx.activity.OnBackPressedDispatcher
import com.badoo.reaktive.base.setCancellable
import com.badoo.reaktive.observable.Observable
import com.badoo.reaktive.observable.observable
import com.hadisatrio.libs.kotlin.foundation.event.CancellationEvent
import com.hadisatrio.libs.kotlin.foundation.event.Event
import com.hadisatrio.libs.kotlin.foundation.event.EventSource
class BackButtonCancellationEventSource(
private val dispatcher: OnBackPressedDispatcher
) : EventSource {
private val events: Observable<CancellationEvent> by lazy {
observable { emitter ->
val callback = object : OnBackPressedCallback(true) {
override fun handleOnBackPressed() {
emitter.onNext(CancellationEvent("user"))
}
}
dispatcher.addCallback(callback)
emitter.setCancellable { callback.remove() }
}
}
constructor(activity: ComponentActivity) : this(activity.onBackPressedDispatcher)
override fun events(): Observable<Event> {
return events
}
}