73 lines
2.7 KiB
Kotlin
73 lines
2.7 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.bookmarks
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import mozilla.components.concept.storage.BookmarkNode
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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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class BookmarkStore(
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initalState: BookmarkState
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) : Store<BookmarkState, BookmarkAction>(
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initalState, ::bookmarkStateReducer
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)
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/**
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* The complete state of the bookmarks tree and multi-selection mode
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* @property tree The current tree of bookmarks, if one is loaded
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* @property mode The current bookmark multi-selection mode
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*/
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data class BookmarkState(val tree: BookmarkNode?, val mode: Mode = Mode.Normal) : State {
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sealed class Mode {
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open val selectedItems = emptySet<BookmarkNode>()
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object Normal : Mode()
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data class Selecting(override val selectedItems: Set<BookmarkNode>) : Mode()
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}
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}
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/**
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* Actions to dispatch through the `BookmarkStore` to modify `BookmarkState` through the reducer.
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*/
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sealed class BookmarkAction : Action {
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data class Change(val tree: BookmarkNode) : BookmarkAction()
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data class Select(val item: BookmarkNode) : BookmarkAction()
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data class Deselect(val item: BookmarkNode) : BookmarkAction()
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object DeselectAll : BookmarkAction()
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}
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/**
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* Reduces the bookmarks state from the current state and an action performed on it.
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* @param state the current bookmarks state
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* @param action the action to perform
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* @return the new bookmarks state
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*/
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fun bookmarkStateReducer(state: BookmarkState, action: BookmarkAction): BookmarkState {
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return when (action) {
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is BookmarkAction.Change -> {
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val items = state.mode.selectedItems.filter { it in action.tree }
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state.copy(
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tree = action.tree,
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mode = if (items.isEmpty()) BookmarkState.Mode.Normal else BookmarkState.Mode.Selecting(items.toSet())
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)
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}
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is BookmarkAction.Select ->
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state.copy(mode = BookmarkState.Mode.Selecting(state.mode.selectedItems + action.item))
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is BookmarkAction.Deselect -> {
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val items = state.mode.selectedItems - action.item
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state.copy(
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mode = if (items.isEmpty()) BookmarkState.Mode.Normal else BookmarkState.Mode.Selecting(items)
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)
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}
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BookmarkAction.DeselectAll ->
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state.copy(mode = BookmarkState.Mode.Normal)
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}
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}
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operator fun BookmarkNode.contains(item: BookmarkNode): Boolean {
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return children?.contains(item) ?: false
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}
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