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90 lines
4.1 KiB
Kotlin
90 lines
4.1 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.library.history.state
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import androidx.navigation.NavController
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import androidx.navigation.NavOptions
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import kotlinx.coroutines.CoroutineScope
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import kotlinx.coroutines.Dispatchers
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import kotlinx.coroutines.launch
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import mozilla.components.lib.state.Middleware
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import mozilla.components.lib.state.MiddlewareContext
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import org.mozilla.fenix.R
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import org.mozilla.fenix.ext.navigateSafe
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import org.mozilla.fenix.library.history.History
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import org.mozilla.fenix.library.history.HistoryFragmentAction
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import org.mozilla.fenix.library.history.HistoryFragmentDirections
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import org.mozilla.fenix.library.history.HistoryFragmentState
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import org.mozilla.fenix.library.history.HistoryFragmentStore
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/**
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* A [Middleware] for initiating navigation events based on [HistoryFragmentAction]s that are
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* dispatched to the [HistoryFragmentStore].
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*
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* @property navController [NavController] for handling navigation events
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* @property openToBrowser Callback to open history items in a browser window.
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* @property onBackPressed Callback to handle back press actions.
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* @property scope [CoroutineScope] used to launch coroutines.
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*/
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class HistoryNavigationMiddleware(
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private val navController: NavController,
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private val openToBrowser: (item: History.Regular) -> Unit,
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private val onBackPressed: () -> Unit,
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private val scope: CoroutineScope = CoroutineScope(Dispatchers.Main),
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) : Middleware<HistoryFragmentState, HistoryFragmentAction> {
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override fun invoke(
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context: MiddlewareContext<HistoryFragmentState, HistoryFragmentAction>,
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next: (HistoryFragmentAction) -> Unit,
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action: HistoryFragmentAction,
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) {
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// Read the current state before letting the chain process the action, so that clicks are
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// treated correctly in reference to the number of selected items.
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val currentState = context.state
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next(action)
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scope.launch {
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when (action) {
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is HistoryFragmentAction.EnterRecentlyClosed -> {
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navController.navigate(
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HistoryFragmentDirections.actionGlobalRecentlyClosed(),
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NavOptions.Builder().setPopUpTo(R.id.recentlyClosedFragment, true).build(),
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)
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}
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is HistoryFragmentAction.BackPressed -> {
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// When editing, we override the back pressed event to update the mode.
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if (currentState.mode !is HistoryFragmentState.Mode.Editing) {
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onBackPressed()
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}
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}
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is HistoryFragmentAction.HistoryItemClicked -> {
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if (currentState.mode.selectedItems.isEmpty()) {
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when (val item = action.item) {
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is History.Regular -> openToBrowser(item)
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is History.Group -> {
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navController.navigate(
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HistoryFragmentDirections.actionGlobalHistoryMetadataGroup(
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title = item.title,
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historyMetadataItems = item.items.toTypedArray(),
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),
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NavOptions.Builder()
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.setPopUpTo(R.id.historyMetadataGroupFragment, true)
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.build(),
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)
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}
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else -> Unit
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}
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}
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}
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is HistoryFragmentAction.SearchClicked -> {
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navController.navigateSafe(
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R.id.historyFragment,
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HistoryFragmentDirections.actionGlobalSearchDialog(null),
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)
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}
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else -> Unit
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}
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}
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}
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}
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