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55 lines
1.9 KiB
Kotlin
55 lines
1.9 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.tabstray.browser
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.ExperimentalCoroutinesApi
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import kotlinx.coroutines.cancel
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import kotlinx.coroutines.flow.collect
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import kotlinx.coroutines.flow.drop
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import kotlinx.coroutines.flow.map
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import mozilla.components.browser.tabstray.TabsAdapter.Companion.PAYLOAD_DONT_HIGHLIGHT_SELECTED_ITEM
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import mozilla.components.browser.tabstray.TabsAdapter.Companion.PAYLOAD_HIGHLIGHT_SELECTED_ITEM
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import mozilla.components.lib.state.ext.flowScoped
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import mozilla.components.support.base.feature.LifecycleAwareFeature
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import mozilla.components.support.ktx.kotlinx.coroutines.flow.ifChanged
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import org.mozilla.fenix.tabstray.TabsTrayState.Mode
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import org.mozilla.fenix.tabstray.TabsTrayStore
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/**
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* Notifies the adapter when the selection mode changes.
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*/
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class SelectedItemAdapterBinding(
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val store: TabsTrayStore,
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val adapter: BrowserTabsAdapter
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) : LifecycleAwareFeature {
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private var scope: CoroutineScope? = null
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@OptIn(ExperimentalCoroutinesApi::class)
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override fun start() {
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scope = store.flowScoped { flow ->
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flow.map { it.mode }
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// ignore initial mode update; the adapter is already in an updated state.
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.drop(1)
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.ifChanged()
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.collect { mode ->
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notifyAdapter(mode)
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}
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}
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}
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override fun stop() {
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scope?.cancel()
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}
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private fun notifyAdapter(mode: Mode) = with(adapter) {
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if (mode == Mode.Normal) {
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notifyItemRangeChanged(0, itemCount, PAYLOAD_HIGHLIGHT_SELECTED_ITEM)
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} else {
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notifyItemRangeChanged(0, itemCount, PAYLOAD_DONT_HIGHLIGHT_SELECTED_ITEM)
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}
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}
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}
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