253 lines
8.2 KiB
TypeScript
253 lines
8.2 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {ApplicationRef} from '../application_ref';
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import {ChangeDetectorRef as viewEngine_ChangeDetectorRef} from '../change_detection/change_detector_ref';
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import {ViewContainerRef as viewEngine_ViewContainerRef} from '../linker/view_container_ref';
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import {EmbeddedViewRef as viewEngine_EmbeddedViewRef, InternalViewRef as viewEngine_InternalViewRef} from '../linker/view_ref';
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import {checkNoChanges, detectChanges, markViewDirty, storeCleanupFn} from './instructions';
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import {ComponentTemplate} from './interfaces/definition';
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import {LViewNode} from './interfaces/node';
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import {LView, LViewFlags} from './interfaces/view';
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import {destroyLView} from './node_manipulation';
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// Needed due to tsickle downleveling where multiple `implements` with classes creates
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// multiple @extends in Closure annotations, which is illegal. This workaround fixes
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// the multiple @extends by making the annotation @implements instead
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export interface viewEngine_ChangeDetectorRef_interface extends viewEngine_ChangeDetectorRef {}
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export class ViewRef<T> implements viewEngine_EmbeddedViewRef<T>, viewEngine_InternalViewRef,
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viewEngine_ChangeDetectorRef_interface {
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private _appRef: ApplicationRef|null;
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context: T;
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rootNodes: any[];
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constructor(protected _view: LView, context: T|null) { this.context = context !; }
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/** @internal */
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_setComponentContext(view: LView, context: T) {
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this._view = view;
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this.context = context;
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}
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get destroyed(): boolean {
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return (this._view.flags & LViewFlags.Destroyed) === LViewFlags.Destroyed;
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}
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destroy(): void { destroyLView(this._view); }
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onDestroy(callback: Function) { storeCleanupFn(this._view, callback); }
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/**
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* Marks a view and all of its ancestors dirty.
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*
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* It also triggers change detection by calling `scheduleTick` internally, which coalesces
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* multiple `markForCheck` calls to into one change detection run.
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*
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* This can be used to ensure an {@link ChangeDetectionStrategy#OnPush OnPush} component is
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* checked when it needs to be re-rendered but the two normal triggers haven't marked it
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* dirty (i.e. inputs haven't changed and events haven't fired in the view).
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*
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* <!-- TODO: Add a link to a chapter on OnPush components -->
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*
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* ### Example ([live demo](https://stackblitz.com/edit/angular-kx7rrw))
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*
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* ```typescript
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* @Component({
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* selector: 'my-app',
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* template: `Number of ticks: {{numberOfTicks}}`
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* changeDetection: ChangeDetectionStrategy.OnPush,
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* })
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* class AppComponent {
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* numberOfTicks = 0;
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*
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* constructor(private ref: ChangeDetectorRef) {
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* setInterval(() => {
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* this.numberOfTicks++;
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* // the following is required, otherwise the view will not be updated
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* this.ref.markForCheck();
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* }, 1000);
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* }
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* }
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* ```
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*/
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markForCheck(): void { markViewDirty(this._view); }
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/**
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* Detaches the view from the change detection tree.
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*
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* Detached views will not be checked during change detection runs until they are
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* re-attached, even if they are dirty. `detach` can be used in combination with
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* {@link ChangeDetectorRef#detectChanges detectChanges} to implement local change
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* detection checks.
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*
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* <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->
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* <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->
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*
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* ### Example
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*
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* The following example defines a component with a large list of readonly data.
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* Imagine the data changes constantly, many times per second. For performance reasons,
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* we want to check and update the list every five seconds. We can do that by detaching
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* the component's change detector and doing a local check every five seconds.
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*
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* ```typescript
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* class DataProvider {
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* // in a real application the returned data will be different every time
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* get data() {
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* return [1,2,3,4,5];
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* }
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* }
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*
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* @Component({
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* selector: 'giant-list',
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* template: `
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* <li *ngFor="let d of dataProvider.data">Data {{d}}</li>
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* `,
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* })
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* class GiantList {
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* constructor(private ref: ChangeDetectorRef, private dataProvider: DataProvider) {
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* ref.detach();
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* setInterval(() => {
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* this.ref.detectChanges();
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* }, 5000);
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* }
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* }
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*
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* @Component({
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* selector: 'app',
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* providers: [DataProvider],
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* template: `
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* <giant-list><giant-list>
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* `,
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* })
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* class App {
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* }
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* ```
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*/
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detach(): void { this._view.flags &= ~LViewFlags.Attached; }
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/**
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* Re-attaches a view to the change detection tree.
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*
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* This can be used to re-attach views that were previously detached from the tree
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* using {@link ChangeDetectorRef#detach detach}. Views are attached to the tree by default.
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*
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* <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->
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*
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* ### Example ([live demo](https://stackblitz.com/edit/angular-ymgsxw))
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*
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* The following example creates a component displaying `live` data. The component will detach
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* its change detector from the main change detector tree when the component's live property
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* is set to false.
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*
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* ```typescript
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* class DataProvider {
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* data = 1;
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*
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* constructor() {
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* setInterval(() => {
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* this.data = this.data * 2;
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* }, 500);
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* }
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* }
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*
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* @Component({
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* selector: 'live-data',
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* inputs: ['live'],
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* template: 'Data: {{dataProvider.data}}'
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* })
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* class LiveData {
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* constructor(private ref: ChangeDetectorRef, private dataProvider: DataProvider) {}
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*
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* set live(value) {
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* if (value) {
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* this.ref.reattach();
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* } else {
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* this.ref.detach();
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* }
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* }
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* }
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*
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* @Component({
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* selector: 'my-app',
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* providers: [DataProvider],
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* template: `
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* Live Update: <input type="checkbox" [(ngModel)]="live">
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* <live-data [live]="live"><live-data>
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* `,
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* })
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* class AppComponent {
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* live = true;
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* }
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* ```
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*/
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reattach(): void { this._view.flags |= LViewFlags.Attached; }
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/**
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* Checks the view and its children.
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*
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* This can also be used in combination with {@link ChangeDetectorRef#detach detach} to implement
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* local change detection checks.
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*
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* <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->
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* <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->
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*
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* ### Example
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*
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* The following example defines a component with a large list of readonly data.
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* Imagine, the data changes constantly, many times per second. For performance reasons,
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* we want to check and update the list every five seconds.
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*
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* We can do that by detaching the component's change detector and doing a local change detection
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* check every five seconds.
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*
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* See {@link ChangeDetectorRef#detach detach} for more information.
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*/
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detectChanges(): void { detectChanges(this.context); }
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/**
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* Checks the change detector and its children, and throws if any changes are detected.
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*
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* This is used in development mode to verify that running change detection doesn't
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* introduce other changes.
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*/
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checkNoChanges(): void { checkNoChanges(this.context); }
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detachFromAppRef() { this._appRef = null; }
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attachToAppRef(appRef: ApplicationRef) { this._appRef = appRef; }
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}
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export class EmbeddedViewRef<T> extends ViewRef<T> {
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/**
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* @internal
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*/
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_lViewNode: LViewNode;
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private _viewContainerRef: viewEngine_ViewContainerRef|null = null;
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constructor(viewNode: LViewNode, template: ComponentTemplate<T>, context: T) {
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super(viewNode.data, context);
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this._lViewNode = viewNode;
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}
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destroy(): void {
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if (this._viewContainerRef &&
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(this._view.flags & LViewFlags.Attached) === LViewFlags.Attached) {
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this._viewContainerRef.detach(this._viewContainerRef.indexOf(this));
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this._viewContainerRef = null;
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}
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super.destroy();
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}
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attachToViewContainerRef(vcRef: viewEngine_ViewContainerRef) { this._viewContainerRef = vcRef; }
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}
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