@clr/angular
Version:
Angular components for Clarity
190 lines • 19.9 kB
JavaScript
/*
* Copyright (c) 2016-2023 VMware, Inc. All Rights Reserved.
* This software is released under MIT license.
* The full license information can be found in LICENSE in the root directory of this project.
*/
import { Injectable } from '@angular/core';
import { Subject } from 'rxjs';
import * as i0 from "@angular/core";
import * as i1 from "./filters";
import * as i2 from "./sort";
import * as i3 from "./page";
export class Items {
constructor(_filters, _sort, _page) {
this._filters = _filters;
this._sort = _sort;
this._page = _page;
/**
* Indicates if the data is currently loading
*/
this.loading = false;
/**
* Whether we should use smart items for this datagrid or let the user handle
* everything.
*/
this._smart = false;
/**
* List of items currently displayed
*/
this._displayed = [];
/**
* The Observable that lets other classes subscribe to items changes
*/
this._change = new Subject();
this._allChanges = new Subject();
/**
* Tracking function to identify objects. Default is reference equality.
*
* @deprecated in v15 and scheduled for removal in v17 (CDE-71)
*/
this.iteratorTrackBy = (_index, item) => item;
}
get smart() {
return this._smart;
}
get all() {
return this._all;
}
set all(items) {
this._all = items;
this.emitAllChanges(items);
if (this.smart) {
this._filterItems();
}
else {
this._displayed = items;
this.emitChange();
}
}
get displayed() {
// Ideally we could return an immutable array, but we don't have it in Clarity yet.
return this._displayed;
}
// We do not want to expose the Subject itself, but the Observable which is read-only
get change() {
return this._change.asObservable();
}
get allChanges() {
return this._allChanges.asObservable();
}
/**
* Checks if we don't have data to process yet, to abort early operations
*/
get uninitialized() {
return !this._all;
}
/**
* Cleans up our subscriptions to other providers
*/
destroy() {
if (this._filtersSub) {
this._filtersSub.unsubscribe();
}
if (this._sortSub) {
this._sortSub.unsubscribe();
}
if (this._pageSub) {
this._pageSub.unsubscribe();
}
}
smartenUp() {
this._smart = true;
/*
* These observers trigger a chain of function: filter -> sort -> paginate
* An observer up the chain re-triggers all the operations that follow it.
*/
this._filtersSub = this._filters.change.subscribe(() => this._filterItems());
this._sortSub = this._sort.change.subscribe(() => {
// Special case, if the datagrid went from sorted to unsorted, we have to re-filter
// to get the original order back
if (!this._sort.comparator) {
this._filterItems();
}
else {
this._sortItems();
}
});
this._pageSub = this._page.change.subscribe(() => this._changePage());
}
/**
* Manually recompute the list of displayed items
*/
refresh() {
if (this.smart) {
this._filterItems();
}
}
canTrackBy() {
// all items are needed unless `datagridTrackBy` is set because `iteratorTrackBy` requires the item's index
return !!this.datagridTrackBy || Array.isArray(this.all);
}
trackBy(item, index) {
if (this.datagridTrackBy) {
return this.datagridTrackBy(item);
}
else if (Array.isArray(this.all)) {
index = index ?? this.all.indexOf(item);
return this.iteratorTrackBy(index, item);
}
else {
throw new Error('improper call to Items#trackBy');
}
}
emitChange() {
this._change.next(this.displayed);
}
emitAllChanges(items) {
this._allChanges.next(items);
}
/**
* FiltersProvider items from the raw list
*/
_filterItems() {
if (this.uninitialized) {
return;
}
if (this._filters.hasActiveFilters()) {
this._filtered = this._all.filter(item => this._filters.accepts(item));
}
else {
// Work on a shallow copy of the array, to not modify the user's model
this._filtered = this._all.slice();
}
this._page.totalItems = this._filtered.length;
this._sortItems();
}
/**
* Sorts items in the filtered list
*/
_sortItems() {
if (this.uninitialized) {
return;
}
if (this._sort.comparator) {
this._filtered.sort((a, b) => this._sort.compare(a, b));
}
this._changePage();
}
/**
* Extracts the current page from the sorted list
*/
_changePage() {
// If we know we have pagination but the page size hasn't been set yet, we wait for it.
if (this.uninitialized || (this._page.activated && this._page.size === 0)) {
return;
}
if (this._page.size > 0) {
this._displayed = this._filtered.slice(this._page.firstItem, this._page.lastItem + 1);
}
else {
this._displayed = this._filtered;
}
this.emitChange();
}
}
Items.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: Items, deps: [{ token: i1.FiltersProvider }, { token: i2.Sort }, { token: i3.Page }], target: i0.ɵɵFactoryTarget.Injectable });
Items.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: Items });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "15.2.2", ngImport: i0, type: Items, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i1.FiltersProvider }, { type: i2.Sort }, { type: i3.Page }]; } });
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All Rights Reserved.\n * This software is released under MIT license.\n * The full license information can be found in LICENSE in the root directory of this project.\n */\n\nimport { Injectable, TrackByFunction } from '@angular/core';\nimport { Observable } from 'rxjs';\nimport { Subject } from 'rxjs';\nimport { Subscription } from 'rxjs';\n\nimport { FiltersProvider } from './filters';\nimport { Page } from './page';\nimport { Sort } from './sort';\n\nexport type ClrDatagridItemsTrackByFunction<T> = (item: T) => any;\n\n@Injectable()\nexport class Items<T = any> {\n  /**\n   * Indicates if the data is currently loading\n   */\n  loading = false;\n\n  /**\n   * New tracking function to identify objects. If provided, this will be used instead of `iteratorTrackBy`.\n   */\n  datagridTrackBy: ClrDatagridItemsTrackByFunction<T>;\n\n  /**\n   * Subscriptions to the other providers changes.\n   */\n  private _filtersSub: Subscription;\n  private _sortSub: Subscription;\n  private _pageSub: Subscription;\n\n  /**\n   * Whether we should use smart items for this datagrid or let the user handle\n   * everything.\n   */\n  private _smart = false;\n\n  /**\n   * List of all items in the datagrid\n   */\n  private _all: T[];\n\n  /**\n   * Internal temporary step, which we preserve to avoid re-filtering or re-sorting if not necessary\n   */\n  private _filtered: T[];\n\n  /**\n   * List of items currently displayed\n   */\n  private _displayed: T[] = [];\n\n  /**\n   * The Observable that lets other classes subscribe to items changes\n   */\n  private _change = new Subject<T[]>();\n\n  private _allChanges = new Subject<T[]>();\n\n  constructor(private _filters: FiltersProvider<T>, private _sort: Sort<T>, private _page: Page) {}\n\n  get smart(): boolean {\n    return this._smart;\n  }\n\n  get all() {\n    return this._all;\n  }\n  set all(items: T[]) {\n    this._all = items;\n    this.emitAllChanges(items);\n    if (this.smart) {\n      this._filterItems();\n    } else {\n      this._displayed = items;\n      this.emitChange();\n    }\n  }\n\n  get displayed(): T[] {\n    // Ideally we could return an immutable array, but we don't have it in Clarity yet.\n    return this._displayed;\n  }\n\n  // We do not want to expose the Subject itself, but the Observable which is read-only\n  get change(): Observable<T[]> {\n    return this._change.asObservable();\n  }\n\n  get allChanges(): Observable<T[]> {\n    return this._allChanges.asObservable();\n  }\n\n  /**\n   * Checks if we don't have data to process yet, to abort early operations\n   */\n  private get uninitialized() {\n    return !this._all;\n  }\n\n  /**\n   * Tracking function to identify objects. Default is reference equality.\n   *\n   * @deprecated in v15 and scheduled for removal in v17 (CDE-71)\n   */\n  iteratorTrackBy: TrackByFunction<T> = (_index, item) => item;\n\n  /**\n   * Cleans up our subscriptions to other providers\n   */\n  destroy() {\n    if (this._filtersSub) {\n      this._filtersSub.unsubscribe();\n    }\n    if (this._sortSub) {\n      this._sortSub.unsubscribe();\n    }\n    if (this._pageSub) {\n      this._pageSub.unsubscribe();\n    }\n  }\n\n  smartenUp() {\n    this._smart = true;\n    /*\n     * These observers trigger a chain of function: filter -> sort -> paginate\n     * An observer up the chain re-triggers all the operations that follow it.\n     */\n    this._filtersSub = this._filters.change.subscribe(() => this._filterItems());\n    this._sortSub = this._sort.change.subscribe(() => {\n      // Special case, if the datagrid went from sorted to unsorted, we have to re-filter\n      // to get the original order back\n      if (!this._sort.comparator) {\n        this._filterItems();\n      } else {\n        this._sortItems();\n      }\n    });\n    this._pageSub = this._page.change.subscribe(() => this._changePage());\n  }\n\n  /**\n   * Manually recompute the list of displayed items\n   */\n  refresh() {\n    if (this.smart) {\n      this._filterItems();\n    }\n  }\n\n  canTrackBy(): boolean {\n    // all items are needed unless `datagridTrackBy` is set because `iteratorTrackBy` requires the item's index\n    return !!this.datagridTrackBy || Array.isArray(this.all);\n  }\n\n  trackBy(item: T, index?: number) {\n    if (this.datagridTrackBy) {\n      return this.datagridTrackBy(item);\n    } else if (Array.isArray(this.all)) {\n      index = index ?? this.all.indexOf(item);\n      return this.iteratorTrackBy(index, item);\n    } else {\n      throw new Error('improper call to Items#trackBy');\n    }\n  }\n\n  private emitChange() {\n    this._change.next(this.displayed);\n  }\n\n  private emitAllChanges(items: T[]): void {\n    this._allChanges.next(items);\n  }\n\n  /**\n   * FiltersProvider items from the raw list\n   */\n  private _filterItems() {\n    if (this.uninitialized) {\n      return;\n    }\n    if (this._filters.hasActiveFilters()) {\n      this._filtered = this._all.filter(item => this._filters.accepts(item));\n    } else {\n      // Work on a shallow copy of the array, to not modify the user's model\n      this._filtered = this._all.slice();\n    }\n    this._page.totalItems = this._filtered.length;\n    this._sortItems();\n  }\n\n  /**\n   * Sorts items in the filtered list\n   */\n  private _sortItems() {\n    if (this.uninitialized) {\n      return;\n    }\n    if (this._sort.comparator) {\n      this._filtered.sort((a, b) => this._sort.compare(a, b));\n    }\n    this._changePage();\n  }\n\n  /**\n   * Extracts the current page from the sorted list\n   */\n  private _changePage() {\n    // If we know we have pagination but the page size hasn't been set yet, we wait for it.\n    if (this.uninitialized || (this._page.activated && this._page.size === 0)) {\n      return;\n    }\n    if (this._page.size > 0) {\n      this._displayed = this._filtered.slice(this._page.firstItem, this._page.lastItem + 1);\n    } else {\n      this._displayed = this._filtered;\n    }\n    this.emitChange();\n  }\n}\n"]}