@datorama/akita
Version:
State Management Tailored-Made for JS Applications
266 lines • 19.8 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
import { pairwise } from 'rxjs/operators';
import { AkitaPlugin } from '../plugin';
import { logAction } from '../../actions';
import { isFunction } from '../../isFunction';
/**
* @record
*/
export function StateHistoryParams() { }
if (false) {
/** @type {?|undefined} */
StateHistoryParams.prototype.maxAge;
/** @type {?|undefined} */
StateHistoryParams.prototype.comparator;
}
/**
* @template State
*/
export class StateHistoryPlugin extends AkitaPlugin {
/**
* @param {?} query
* @param {?=} params
* @param {?=} _entityId
*/
constructor(query, params = {}, _entityId) {
super(query, {
resetFn: (/**
* @return {?}
*/
() => this.clear())
});
this.query = query;
this.params = params;
this._entityId = _entityId;
/**
* Allow skipping an update from outside
*/
this.skip = false;
this.history = {
past: [],
present: null,
future: []
};
/**
* Skip the update when redo/undo
*/
this.skipUpdate = false;
params.maxAge = !!params.maxAge ? params.maxAge : 10;
params.comparator = params.comparator || ((/**
* @return {?}
*/
() => true));
this.activate();
}
/**
* @return {?}
*/
get hasPast() {
return this.history.past.length > 0;
}
/**
* @return {?}
*/
get hasFuture() {
return this.history.future.length > 0;
}
/**
* @return {?}
*/
activate() {
this.history.present = this.getSource(this._entityId);
this.subscription = ((/** @type {?} */ (this))).selectSource(this._entityId).pipe(pairwise())
.subscribe((/**
* @param {?} __0
* @return {?}
*/
([past, present]) => {
if (this.skip) {
this.skip = false;
return;
}
/**
* comparator: (prev, current) => isEqual(prev, current) === false
* @type {?}
*/
const shouldUpdate = this.params.comparator(past, present);
if (!this.skipUpdate && shouldUpdate) {
if (this.history.past.length === this.params.maxAge) {
this.history.past = this.history.past.slice(1);
}
this.history.past = [...this.history.past, past];
this.history.present = present;
}
}));
}
/**
* @return {?}
*/
undo() {
if (this.history.past.length > 0) {
const { past, present } = this.history;
/** @type {?} */
const previous = past[past.length - 1];
this.history.past = past.slice(0, past.length - 1);
this.history.present = previous;
this.history.future = [present, ...this.history.future];
this.update();
}
}
/**
* @return {?}
*/
redo() {
if (this.history.future.length > 0) {
const { past, present } = this.history;
/** @type {?} */
const next = this.history.future[0];
/** @type {?} */
const newFuture = this.history.future.slice(1);
this.history.past = [...past, present];
this.history.present = next;
this.history.future = newFuture;
this.update('Redo');
}
}
/**
* @param {?} index
* @return {?}
*/
jumpToPast(index) {
if (index < 0 || index >= this.history.past.length)
return;
const { past, future } = this.history;
/**
*
* const past = [1, 2, 3, 4, 5];
*
* newPast = past.slice(0, 2) = [1, 2];
* present = past[index] = 3;
* [...past.slice(2 + 1), ...future] = [4, 5];
*
* @type {?}
*/
const newPast = past.slice(0, index);
/** @type {?} */
const newFuture = [...past.slice(index + 1), ...future];
/** @type {?} */
const newPresent = past[index];
this.history.past = newPast;
this.history.present = newPresent;
this.history.future = newFuture;
this.update();
}
/**
* @param {?} index
* @return {?}
*/
jumpToFuture(index) {
if (index < 0 || index >= this.history.future.length)
return;
const { past, future } = this.history;
/** @type {?} */
const newPast = [...past, ...future.slice(0, index)];
/** @type {?} */
const newPresent = future[index];
/** @type {?} */
const newFuture = future.slice(index + 1);
this.history.past = newPast;
this.history.present = newPresent;
this.history.future = newFuture;
this.update('Redo');
}
/**
* Clear the history
*
* \@example
*
* stateHistory.clear((history) => {
* return {
* past: history.past,
* present: history.present,
* future: []
* };
* });
* @param {?=} customUpdateFn Callback function for only clearing part of the history
*
* @return {?}
*/
clear(customUpdateFn) {
this.history = isFunction(customUpdateFn) ? customUpdateFn(this.history) : {
past: [],
present: null,
future: []
};
}
/**
* @param {?=} clearHistory
* @return {?}
*/
destroy(clearHistory = false) {
if (clearHistory) {
this.clear();
}
this.subscription.unsubscribe();
}
/**
* @return {?}
*/
ignoreNext() {
this.skip = true;
}
/**
* @private
* @param {?=} action
* @return {?}
*/
update(action = 'Undo') {
this.skipUpdate = true;
logAction(` - ${action}`);
this.updateStore(this.history.present, this._entityId);
this.skipUpdate = false;
}
}
if (false) {
/**
* Allow skipping an update from outside
* @type {?}
* @private
*/
StateHistoryPlugin.prototype.skip;
/**
* @type {?}
* @private
*/
StateHistoryPlugin.prototype.history;
/**
* Skip the update when redo/undo
* @type {?}
* @private
*/
StateHistoryPlugin.prototype.skipUpdate;
/**
* @type {?}
* @private
*/
StateHistoryPlugin.prototype.subscription;
/**
* @type {?}
* @protected
*/
StateHistoryPlugin.prototype.query;
/**
* @type {?}
* @private
*/
StateHistoryPlugin.prototype.params;
/**
* @type {?}
* @private
*/
StateHistoryPlugin.prototype._entityId;
}
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{ pairwise } from 'rxjs/operators';\nimport { AkitaPlugin, Queries } from '../plugin';\nimport { logAction } from '../../actions';\nimport { isFunction } from '../../isFunction';\n\nexport interface StateHistoryParams {\n  maxAge?: number;\n  comparator?: (prevState, currentState) => boolean;\n}\n\nexport type History<State> = {\n  past: State[],\n  present: State | null,\n  future: State[]\n}\n\nexport class StateHistoryPlugin<State = any> extends AkitaPlugin<State> {\n  /** Allow skipping an update from outside */\n  private skip = false;\n\n  private history = {\n    past: [],\n    present: null,\n    future: []\n  };\n\n  /** Skip the update when redo/undo */\n  private skipUpdate = false;\n  private subscription;\n\n  constructor(protected query: Queries<State>, private params: StateHistoryParams = {}, private _entityId?: any) {\n    super(query, {\n      resetFn: () => this.clear()\n    });\n    params.maxAge = !!params.maxAge ? params.maxAge : 10;\n    params.comparator = params.comparator || (() => true);\n    this.activate();\n  }\n\n  get hasPast() {\n    return this.history.past.length > 0;\n  }\n\n  get hasFuture() {\n    return this.history.future.length > 0;\n  }\n\n  activate() {\n    this.history.present = this.getSource(this._entityId);\n    this.subscription = (this as any).selectSource(this._entityId).pipe(pairwise())\n      .subscribe(([past, present]) => {\n        if(this.skip) {\n          this.skip = false;\n          return;\n        }\n        /**\n         *  comparator: (prev, current) => isEqual(prev, current) === false\n         */\n        const shouldUpdate = this.params.comparator(past, present);\n\n        if(!this.skipUpdate && shouldUpdate) {\n          if(this.history.past.length === this.params.maxAge) {\n            this.history.past = this.history.past.slice(1);\n          }\n          this.history.past = [...this.history.past, past];\n          this.history.present = present;\n        }\n      });\n  }\n\n  undo() {\n    if(this.history.past.length > 0) {\n      const { past, present } = this.history;\n      const previous = past[past.length - 1];\n      this.history.past = past.slice(0, past.length - 1);\n      this.history.present = previous;\n      this.history.future = [present, ...this.history.future];\n      this.update();\n    }\n  }\n\n  redo() {\n    if(this.history.future.length > 0) {\n      const { past, present } = this.history;\n      const next = this.history.future[0];\n      const newFuture = this.history.future.slice(1);\n      this.history.past = [...past, present];\n      this.history.present = next;\n      this.history.future = newFuture;\n      this.update('Redo');\n    }\n  }\n\n  jumpToPast(index: number) {\n    if(index < 0 || index >= this.history.past.length) return;\n\n    const { past, future } = this.history;\n    /**\n     *\n     * const past = [1, 2, 3, 4, 5];\n     *\n     * newPast = past.slice(0, 2) = [1, 2];\n     * present = past[index] = 3;\n     * [...past.slice(2 + 1), ...future] = [4, 5];\n     *\n     */\n    const newPast = past.slice(0, index);\n    const newFuture = [...past.slice(index + 1), ...future];\n    const newPresent = past[index];\n    this.history.past = newPast;\n    this.history.present = newPresent;\n    this.history.future = newFuture;\n    this.update();\n  }\n\n  jumpToFuture(index: number) {\n    if(index < 0 || index >= this.history.future.length) return;\n\n    const { past, future } = this.history;\n\n    const newPast = [...past, ...future.slice(0, index)];\n    const newPresent = future[index];\n    const newFuture = future.slice(index + 1);\n\n    this.history.past = newPast;\n    this.history.present = newPresent;\n    this.history.future = newFuture;\n    this.update('Redo');\n  }\n\n  /**\n   * Clear the history\n   *\n   * @param customUpdateFn Callback function for only clearing part of the history\n   *\n   * @example\n   *\n   * stateHistory.clear((history) => {\n   *  return {\n   *    past: history.past,\n   *    present: history.present,\n   *    future: []\n   *  };\n   * });\n   */\n  clear(customUpdateFn?: (history: History<State>) => History<State>) {\n    this.history = isFunction(customUpdateFn) ? customUpdateFn(this.history) : {\n      past: [],\n      present: null,\n      future: []\n    };\n  }\n\n  destroy(clearHistory = false) {\n    if(clearHistory) {\n      this.clear();\n    }\n    this.subscription.unsubscribe();\n  }\n\n  ignoreNext() {\n    this.skip = true;\n  }\n\n  private update(action = 'Undo') {\n    this.skipUpdate = true;\n    logAction(`@StateHistory - ${action}`);\n    this.updateStore(this.history.present, this._entityId);\n    this.skipUpdate = false;\n  }\n}\n"]}