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import {Event} from 'main.core'; import {PageObject} from 'landing.pageobject'; import {RESOLVED, PENDING} from './internal/constants'; import registerBaseCommands from './internal/register-base-commands'; import removePageHistory from './internal/remove-page-history'; import loadStack from './internal/load-stack'; import fetchEntities from './internal/fetch-entities'; import removeEntities from './internal/remove-entities'; import clear from './internal/clear'; import onUpdate from './internal/on-update'; import onInit from './internal/on-init'; import Command from './history-command'; import Entry from './history-entry'; import Highlight from './history-highlight'; import editText from './action/edit-text'; import editEmbed from './action/edit-embed'; import editMap from './action/edit-map'; import editImage from './action/edit-image'; import editIcon from './action/edit-icon'; import editLink from './action/edit-link'; import sortBlock from './action/sort-block'; import addBlock from './action/add-block'; import removeBlock from './action/remove-block'; import addCard from './action/add-card'; import removeCard from './action/remove-card'; import addNode from './action/add-node'; import removeNode from './action/remove-node'; import editStyle from './action/edit-style'; import updateContent from './action/update-content'; import {Main} from 'landing.main'; /** * Implements interface for works with landing history * Implements singleton pattern use as BX.Landing.History.getInstance() * @memberOf BX.Landing / export class History { static TYPE_LANDING = 'L'; static TYPE_DESIGNER_BLOCK = 'D'; stack: number; commands: {}; /* * From 1 to X. 0 - is state without any history * @type {number} / step: number; commandState: string; landingId: number; designerBlockId: ?number = null; constructor() { this.type = History.TYPE_LANDING; this.stack = 0; this.commands = {}; this.step = 0; this.commandState = RESOLVED; this.onStorage = this.onStorage.bind(this); try { this.landingId = Main.getInstance().id; } catch (err) { this.landingId = -1; } Event.bind(window, 'storage', this.onStorage); registerBaseCommands(this) .then(loadStack) .then(onInit); } static Command = Command; static Entry = Entry; static Highlight = Highlight; // todo: need? // static Action = { // editText, // editEmbed, // editMap, // editImage, // editIcon, // editLink, // sortBlock, // addBlock, // removeBlock, // addCard, // removeCard, // editStyle, // addNode, // removeNode, // updateContent // }; static getInstance(): History { const rootWindow = PageObject.getRootWindow(); if (!rootWindow.BX.Landing.History.instance) { rootWindow.BX.Landing.History.instance = new BX.Landing.History(); } return rootWindow.BX.Landing.History.instance; } /* * Set special type for designer block * @param blockId * @return {Promise<BX.Landing.History>\|} / setTypeDesignerBlock(blockId: number): Promise<History> { this.type = History.TYPE_DESIGNER_BLOCK; this.designerBlockId = blockId; return loadStack(this); } getUndoAction(): string { if (this.type === History.TYPE_DESIGNER_BLOCK) { return "History::undoDesignerBlock"; } return "History::undoLanding"; } getRedoAction(): string { if (this.type === History.TYPE_DESIGNER_BLOCK) { return "History::redoDesignerBlock"; } return "History::redoLanding"; } getActionParams(): string { if ( this.type === History.TYPE_DESIGNER_BLOCK && this.designerBlockId ) { return { blockId: this.designerBlockId, }; } return { lid: this.landingId, }; } /** * Applies preview history entry * @return {Promise} / undo() { if (this.canUndo()) { return BX.Landing.Backend.getInstance() .action( this.getUndoAction(), this.getActionParams(), ) .then(command => { if (command) { const params = command.params; const entry = new Entry({ block: params.block, selector: params.selector, command: command.command, params: params, }); return this.runCommand(entry, -1); } return Promise.reject(); }) .then(res => { return this.offset(-1).then(onUpdate); }) } return Promise.resolve(this); } /* * Applies preview next history entry * @return {Promise} / redo() { if (this.canRedo()) { return BX.Landing.Backend.getInstance() .action( this.getRedoAction(), this.getActionParams(), ) .then(command => { if (command) { const params = command.params; const entry = new Entry({ block: params.block, selector: params.selector, command: command.command, params: params, }); return this.runCommand(entry, 1); } return Promise.reject(); }) .then(res => { return this.offset(1).then(onUpdate); }) } return Promise.resolve(this); } offset(offsetValue: number): Promise<History> { if (this.commandState === PENDING) { return Promise.resolve(this); } let step = this.step + offsetValue; if (step >= 0 && step <= this.stack) { this.step = step; } return Promise.resolve(this); } runCommand(entry: Entry, offsetValue: number) { if (entry) { const command = this.commands[entry.command]; if (command) { this.commandState = PENDING; return command.command(entry) .then(() => { this.commandState = RESOLVED; return this; }) .catch(() => { this.commandState = RESOLVED; // todo: how check and process error return this.offset(offsetValue); }); } } } /* * Check that there are actions to undo * @returns {boolean} / canUndo() { return ( this.commandState !== PENDING && (this.step > 0 && this.stack > 0 && this.step <= this.stack) ); } /* * Check that there are actions to redo * @returns {boolean} / canRedo() { return ( this.commandState !== PENDING && (this.step < this.stack && this.step >= 0) ); } /* * Adds entry to history stack * @param {BX.Landing.History.Entry} entry / push(entry) { if (this.step < this.stack) { this.stack = this.step; } this.step++; this.stack++; onUpdate(this); } /* * Registers unique history command * @param {Command} command / registerCommand(command) { if (command instanceof Command) { this.commands[command.id] = command; } } /* * Removes page history from storage * @param {int} pageId * @return {Promise<BX.Landing.History>} / removePageHistory(pageId) { // todo: publication clear method return removePageHistory(pageId, this) .then((history) => { let currentPageId; try { currentPageId = BX.Landing.Main.getInstance().id; } catch (err) { currentPageId = -1; } if (currentPageId === pageId) { return clear(history); } return Promise.reject(); }) .then(onUpdate) .catch(() => {}); } /* * Handles storage event * @param {StorageEvent} event / onStorage(event) { if (event.key === null) { if (!window.localStorage.history) { clear(this).then(onUpdate); } } } /* * Handles new branch events * @param {BX.Landing.History.Entry[]} entries * @return {Promise<History>} */ onNewBranch(entries) { return fetchEntities(entries, this) .then((entities) => { return removeEntities(entities, this); }); } }

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