81 lines
3.0 KiB
Kotlin
81 lines
3.0 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
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import mozilla.components.lib.state.Action
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import mozilla.components.lib.state.State
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import mozilla.components.lib.state.Store
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/**
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* Class representing a history entry
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* @property id Unique id of the history item
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* @property title Title of the history item
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* @property url URL of the history item
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* @property visitedAt Timestamp of when this history item was visited
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*/
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data class HistoryItem(val id: Int, val title: String, val url: String, val visitedAt: Long)
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/**
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* The [Store] for holding the [HistoryState] and applying [HistoryAction]s.
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*/
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class HistoryStore(initialState: HistoryState) :
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Store<HistoryState, HistoryAction>(initialState, ::historyStateReducer)
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/**
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* Actions to dispatch through the `HistoryStore` to modify `HistoryState` through the reducer.
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*/
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sealed class HistoryAction : Action {
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data class Change(val list: List<HistoryItem>) : HistoryAction()
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object ExitEditMode : HistoryAction()
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data class AddItemForRemoval(val item: HistoryItem) : HistoryAction()
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data class RemoveItemForRemoval(val item: HistoryItem) : HistoryAction()
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object EnterDeletionMode : HistoryAction()
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object ExitDeletionMode : HistoryAction()
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}
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/**
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* The state for the History Screen
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* @property items List of HistoryItem to display
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* @property mode Current Mode of History
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*/
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data class HistoryState(val items: List<HistoryItem>, val mode: Mode) : State {
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sealed class Mode {
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object Normal : Mode()
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data class Editing(val selectedItems: Set<HistoryItem>) : Mode()
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object Deleting : Mode()
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}
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}
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/**
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* The HistoryState Reducer.
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*/
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fun historyStateReducer(state: HistoryState, action: HistoryAction): HistoryState {
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return when (action) {
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is HistoryAction.Change -> state.copy(mode = HistoryState.Mode.Normal, items = action.list)
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is HistoryAction.AddItemForRemoval -> {
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val mode = state.mode
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if (mode is HistoryState.Mode.Editing) {
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val items = mode.selectedItems + setOf(action.item)
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state.copy(mode = HistoryState.Mode.Editing(items))
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} else {
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state.copy(mode = HistoryState.Mode.Editing(setOf(action.item)))
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}
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}
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is HistoryAction.RemoveItemForRemoval -> {
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var mode = state.mode
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if (mode is HistoryState.Mode.Editing) {
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val items = mode.selectedItems.minus(action.item)
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state.copy(mode = HistoryState.Mode.Editing(items))
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} else {
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state
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}
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}
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is HistoryAction.ExitEditMode -> state.copy(mode = HistoryState.Mode.Normal)
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is HistoryAction.EnterDeletionMode -> state.copy(mode = HistoryState.Mode.Deleting)
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is HistoryAction.ExitDeletionMode -> state.copy(mode = HistoryState.Mode.Normal)
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}
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}
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