@angular/core
Version:
Angular - the core framework
294 lines • 28.9 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { removeFromArray } from '../util/array_utils';
import { assertEqual } from '../util/assert';
import { collectNativeNodes } from './collect_native_nodes';
import { checkNoChangesInRootView, checkNoChangesInternal, detectChangesInRootView, detectChangesInternal, markViewDirty, storeCleanupWithContext } from './instructions/shared';
import { CONTAINER_HEADER_OFFSET, VIEW_REFS } from './interfaces/container';
import { isLContainer } from './interfaces/type_checks';
import { CONTEXT, FLAGS, PARENT, TVIEW } from './interfaces/view';
import { destroyLView, detachView, renderDetachView } from './node_manipulation';
export class ViewRef {
constructor(
/**
* This represents `LView` associated with the component when ViewRef is a ChangeDetectorRef.
*
* When ViewRef is created for a dynamic component, this also represents the `LView` for the
* component.
*
* For a "regular" ViewRef created for an embedded view, this is the `LView` for the embedded
* view.
*
* @internal
*/
_lView,
/**
* This represents the `LView` associated with the point where `ChangeDetectorRef` was
* requested.
*
* This may be different from `_lView` if the `_cdRefInjectingView` is an embedded view.
*/
_cdRefInjectingView) {
this._lView = _lView;
this._cdRefInjectingView = _cdRefInjectingView;
this._appRef = null;
this._attachedToViewContainer = false;
}
get rootNodes() {
const lView = this._lView;
const tView = lView[TVIEW];
return collectNativeNodes(tView, lView, tView.firstChild, []);
}
get context() {
return this._lView[CONTEXT];
}
set context(value) {
this._lView[CONTEXT] = value;
}
get destroyed() {
return (this._lView[FLAGS] & 256 /* Destroyed */) === 256 /* Destroyed */;
}
destroy() {
if (this._appRef) {
this._appRef.detachView(this);
}
else if (this._attachedToViewContainer) {
const parent = this._lView[PARENT];
if (isLContainer(parent)) {
const viewRefs = parent[VIEW_REFS];
const index = viewRefs ? viewRefs.indexOf(this) : -1;
if (index > -1) {
ngDevMode &&
assertEqual(index, parent.indexOf(this._lView) - CONTAINER_HEADER_OFFSET, 'An attached view should be in the same position within its container as its ViewRef in the VIEW_REFS array.');
detachView(parent, index);
removeFromArray(viewRefs, index);
}
}
this._attachedToViewContainer = false;
}
destroyLView(this._lView[TVIEW], this._lView);
}
onDestroy(callback) {
storeCleanupWithContext(this._lView[TVIEW], this._lView, null, callback);
}
/**
* Marks a view and all of its ancestors dirty.
*
* This can be used to ensure an {@link ChangeDetectionStrategy#OnPush OnPush} component is
* checked when it needs to be re-rendered but the two normal triggers haven't marked it
* dirty (i.e. inputs haven't changed and events haven't fired in the view).
*
* <!-- TODO: Add a link to a chapter on OnPush components -->
*
* @usageNotes
* ### Example
*
* ```typescript
* @Component({
* selector: 'app-root',
* template: `Number of ticks: {{numberOfTicks}}`
* changeDetection: ChangeDetectionStrategy.OnPush,
* })
* class AppComponent {
* numberOfTicks = 0;
*
* constructor(private ref: ChangeDetectorRef) {
* setInterval(() => {
* this.numberOfTicks++;
* // the following is required, otherwise the view will not be updated
* this.ref.markForCheck();
* }, 1000);
* }
* }
* ```
*/
markForCheck() {
markViewDirty(this._cdRefInjectingView || this._lView);
}
/**
* Detaches the view from the change detection tree.
*
* Detached views will not be checked during change detection runs until they are
* re-attached, even if they are dirty. `detach` can be used in combination with
* {@link ChangeDetectorRef#detectChanges detectChanges} to implement local change
* detection checks.
*
* <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->
* <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->
*
* @usageNotes
* ### Example
*
* The following example defines a component with a large list of readonly data.
* Imagine the data changes constantly, many times per second. For performance reasons,
* we want to check and update the list every five seconds. We can do that by detaching
* the component's change detector and doing a local check every five seconds.
*
* ```typescript
* class DataProvider {
* // in a real application the returned data will be different every time
* get data() {
* return [1,2,3,4,5];
* }
* }
*
* @Component({
* selector: 'giant-list',
* template: `
* <li *ngFor="let d of dataProvider.data">Data {{d}}</li>
* `,
* })
* class GiantList {
* constructor(private ref: ChangeDetectorRef, private dataProvider: DataProvider) {
* ref.detach();
* setInterval(() => {
* this.ref.detectChanges();
* }, 5000);
* }
* }
*
* @Component({
* selector: 'app',
* providers: [DataProvider],
* template: `
* <giant-list><giant-list>
* `,
* })
* class App {
* }
* ```
*/
detach() {
this._lView[FLAGS] &= ~128 /* Attached */;
}
/**
* Re-attaches a view to the change detection tree.
*
* This can be used to re-attach views that were previously detached from the tree
* using {@link ChangeDetectorRef#detach detach}. Views are attached to the tree by default.
*
* <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->
*
* @usageNotes
* ### Example
*
* The following example creates a component displaying `live` data. The component will detach
* its change detector from the main change detector tree when the component's live property
* is set to false.
*
* ```typescript
* class DataProvider {
* data = 1;
*
* constructor() {
* setInterval(() => {
* this.data = this.data * 2;
* }, 500);
* }
* }
*
* @Component({
* selector: 'live-data',
* inputs: ['live'],
* template: 'Data: {{dataProvider.data}}'
* })
* class LiveData {
* constructor(private ref: ChangeDetectorRef, private dataProvider: DataProvider) {}
*
* set live(value) {
* if (value) {
* this.ref.reattach();
* } else {
* this.ref.detach();
* }
* }
* }
*
* @Component({
* selector: 'app-root',
* providers: [DataProvider],
* template: `
* Live Update: <input type="checkbox" [(ngModel)]="live">
* <live-data [live]="live"><live-data>
* `,
* })
* class AppComponent {
* live = true;
* }
* ```
*/
reattach() {
this._lView[FLAGS] |= 128 /* Attached */;
}
/**
* Checks the view and its children.
*
* This can also be used in combination with {@link ChangeDetectorRef#detach detach} to implement
* local change detection checks.
*
* <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->
* <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->
*
* @usageNotes
* ### Example
*
* The following example defines a component with a large list of readonly data.
* Imagine, the data changes constantly, many times per second. For performance reasons,
* we want to check and update the list every five seconds.
*
* We can do that by detaching the component's change detector and doing a local change detection
* check every five seconds.
*
* See {@link ChangeDetectorRef#detach detach} for more information.
*/
detectChanges() {
detectChangesInternal(this._lView[TVIEW], this._lView, this.context);
}
/**
* Checks the change detector and its children, and throws if any changes are detected.
*
* This is used in development mode to verify that running change detection doesn't
* introduce other changes.
*/
checkNoChanges() {
checkNoChangesInternal(this._lView[TVIEW], this._lView, this.context);
}
attachToViewContainerRef() {
if (this._appRef) {
throw new Error('This view is already attached directly to the ApplicationRef!');
}
this._attachedToViewContainer = true;
}
detachFromAppRef() {
this._appRef = null;
renderDetachView(this._lView[TVIEW], this._lView);
}
attachToAppRef(appRef) {
if (this._attachedToViewContainer) {
throw new Error('This view is already attached to a ViewContainer!');
}
this._appRef = appRef;
}
}
/** @internal */
export class RootViewRef extends ViewRef {
constructor(_view) {
super(_view);
this._view = _view;
}
detectChanges() {
detectChangesInRootView(this._view);
}
checkNoChanges() {
checkNoChangesInRootView(this._view);
}
get context() {
return null;
}
}
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This workaround fixes\n// the multiple @extends by making the annotation @implements instead\nexport interface viewEngine_ChangeDetectorRef_interface extends viewEngine_ChangeDetectorRef {}\n\nexport class ViewRef<T> implements viewEngine_EmbeddedViewRef<T>, viewEngine_InternalViewRef,\n                                   viewEngine_ChangeDetectorRef_interface {\n  private _appRef: ViewRefTracker|null = null;\n  private _attachedToViewContainer = false;\n\n  get rootNodes(): any[] {\n    const lView = this._lView;\n    const tView = lView[TVIEW];\n    return collectNativeNodes(tView, lView, tView.firstChild, []);\n  }\n\n  constructor(\n      /**\n       * This represents `LView` associated with the component when ViewRef is a ChangeDetectorRef.\n       *\n       * When ViewRef is created for a dynamic component, this also represents the `LView` for the\n       * component.\n       *\n       * For a \"regular\" ViewRef created for an embedded view, this is the `LView` for the embedded\n       * view.\n       *\n       * @internal\n       */\n      public _lView: LView,\n\n      /**\n       * This represents the `LView` associated with the point where `ChangeDetectorRef` was\n       * requested.\n       *\n       * This may be different from `_lView` if the `_cdRefInjectingView` is an embedded view.\n       */\n      private _cdRefInjectingView?: LView) {}\n\n  get context(): T {\n    return this._lView[CONTEXT] as T;\n  }\n\n  set context(value: T) {\n    this._lView[CONTEXT] = value;\n  }\n\n  get destroyed(): boolean {\n    return (this._lView[FLAGS] & LViewFlags.Destroyed) === LViewFlags.Destroyed;\n  }\n\n  destroy(): void {\n    if (this._appRef) {\n      this._appRef.detachView(this);\n    } else if (this._attachedToViewContainer) {\n      const parent = this._lView[PARENT];\n      if (isLContainer(parent)) {\n        const viewRefs = parent[VIEW_REFS] as ViewRef<unknown>[] | null;\n        const index = viewRefs ? viewRefs.indexOf(this) : -1;\n        if (index > -1) {\n          ngDevMode &&\n              assertEqual(\n                  index, parent.indexOf(this._lView) - CONTAINER_HEADER_OFFSET,\n                  'An attached view should be in the same position within its container as its ViewRef in the VIEW_REFS array.');\n          detachView(parent, index);\n          removeFromArray(viewRefs!, index);\n        }\n      }\n      this._attachedToViewContainer = false;\n    }\n    destroyLView(this._lView[TVIEW], this._lView);\n  }\n\n  onDestroy(callback: Function) {\n    storeCleanupWithContext(this._lView[TVIEW], this._lView, null, callback);\n  }\n\n  /**\n   * Marks a view and all of its ancestors dirty.\n   *\n   * This can be used to ensure an {@link ChangeDetectionStrategy#OnPush OnPush} component is\n   * checked when it needs to be re-rendered but the two normal triggers haven't marked it\n   * dirty (i.e. inputs haven't changed and events haven't fired in the view).\n   *\n   * <!-- TODO: Add a link to a chapter on OnPush components -->\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * ```typescript\n   * @Component({\n   *   selector: 'app-root',\n   *   template: `Number of ticks: {{numberOfTicks}}`\n   *   changeDetection: ChangeDetectionStrategy.OnPush,\n   * })\n   * class AppComponent {\n   *   numberOfTicks = 0;\n   *\n   *   constructor(private ref: ChangeDetectorRef) {\n   *     setInterval(() => {\n   *       this.numberOfTicks++;\n   *       // the following is required, otherwise the view will not be updated\n   *       this.ref.markForCheck();\n   *     }, 1000);\n   *   }\n   * }\n   * ```\n   */\n  markForCheck(): void {\n    markViewDirty(this._cdRefInjectingView || this._lView);\n  }\n\n  /**\n   * Detaches the view from the change detection tree.\n   *\n   * Detached views will not be checked during change detection runs until they are\n   * re-attached, even if they are dirty. `detach` can be used in combination with\n   * {@link ChangeDetectorRef#detectChanges detectChanges} to implement local change\n   * detection checks.\n   *\n   * <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->\n   * <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * The following example defines a component with a large list of readonly data.\n   * Imagine the data changes constantly, many times per second. For performance reasons,\n   * we want to check and update the list every five seconds. We can do that by detaching\n   * the component's change detector and doing a local check every five seconds.\n   *\n   * ```typescript\n   * class DataProvider {\n   *   // in a real application the returned data will be different every time\n   *   get data() {\n   *     return [1,2,3,4,5];\n   *   }\n   * }\n   *\n   * @Component({\n   *   selector: 'giant-list',\n   *   template: `\n   *     <li *ngFor=\"let d of dataProvider.data\">Data {{d}}</li>\n   *   `,\n   * })\n   * class GiantList {\n   *   constructor(private ref: ChangeDetectorRef, private dataProvider: DataProvider) {\n   *     ref.detach();\n   *     setInterval(() => {\n   *       this.ref.detectChanges();\n   *     }, 5000);\n   *   }\n   * }\n   *\n   * @Component({\n   *   selector: 'app',\n   *   providers: [DataProvider],\n   *   template: `\n   *     <giant-list><giant-list>\n   *   `,\n   * })\n   * class App {\n   * }\n   * ```\n   */\n  detach(): void {\n    this._lView[FLAGS] &= ~LViewFlags.Attached;\n  }\n\n  /**\n   * Re-attaches a view to the change detection tree.\n   *\n   * This can be used to re-attach views that were previously detached from the tree\n   * using {@link ChangeDetectorRef#detach detach}. Views are attached to the tree by default.\n   *\n   * <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * The following example creates a component displaying `live` data. The component will detach\n   * its change detector from the main change detector tree when the component's live property\n   * is set to false.\n   *\n   * ```typescript\n   * class DataProvider {\n   *   data = 1;\n   *\n   *   constructor() {\n   *     setInterval(() => {\n   *       this.data = this.data * 2;\n   *     }, 500);\n   *   }\n   * }\n   *\n   * @Component({\n   *   selector: 'live-data',\n   *   inputs: ['live'],\n   *   template: 'Data: {{dataProvider.data}}'\n   * })\n   * class LiveData {\n   *   constructor(private ref: ChangeDetectorRef, private dataProvider: DataProvider) {}\n   *\n   *   set live(value) {\n   *     if (value) {\n   *       this.ref.reattach();\n   *     } else {\n   *       this.ref.detach();\n   *     }\n   *   }\n   * }\n   *\n   * @Component({\n   *   selector: 'app-root',\n   *   providers: [DataProvider],\n   *   template: `\n   *     Live Update: <input type=\"checkbox\" [(ngModel)]=\"live\">\n   *     <live-data [live]=\"live\"><live-data>\n   *   `,\n   * })\n   * class AppComponent {\n   *   live = true;\n   * }\n   * ```\n   */\n  reattach(): void {\n    this._lView[FLAGS] |= LViewFlags.Attached;\n  }\n\n  /**\n   * Checks the view and its children.\n   *\n   * This can also be used in combination with {@link ChangeDetectorRef#detach detach} to implement\n   * local change detection checks.\n   *\n   * <!-- TODO: Add a link to a chapter on detach/reattach/local digest -->\n   * <!-- TODO: Add a live demo once ref.detectChanges is merged into master -->\n   *\n   * @usageNotes\n   * ### Example\n   *\n   * The following example defines a component with a large list of readonly data.\n   * Imagine, the data changes constantly, many times per second. For performance reasons,\n   * we want to check and update the list every five seconds.\n   *\n   * We can do that by detaching the component's change detector and doing a local change detection\n   * check every five seconds.\n   *\n   * See {@link ChangeDetectorRef#detach detach} for more information.\n   */\n  detectChanges(): void {\n    detectChangesInternal(this._lView[TVIEW], this._lView, this.context);\n  }\n\n  /**\n   * Checks the change detector and its children, and throws if any changes are detected.\n   *\n   * This is used in development mode to verify that running change detection doesn't\n   * introduce other changes.\n   */\n  checkNoChanges(): void {\n    checkNoChangesInternal(this._lView[TVIEW], this._lView, this.context);\n  }\n\n  attachToViewContainerRef() {\n    if (this._appRef) {\n      throw new Error('This view is already attached directly to the ApplicationRef!');\n    }\n    this._attachedToViewContainer = true;\n  }\n\n  detachFromAppRef() {\n    this._appRef = null;\n    renderDetachView(this._lView[TVIEW], this._lView);\n  }\n\n  attachToAppRef(appRef: ViewRefTracker) {\n    if (this._attachedToViewContainer) {\n      throw new Error('This view is already attached to a ViewContainer!');\n    }\n    this._appRef = appRef;\n  }\n}\n\n/** @internal */\nexport class RootViewRef<T> extends ViewRef<T> {\n  constructor(public _view: LView) {\n    super(_view);\n  }\n\n  override detectChanges(): void {\n    detectChangesInRootView(this._view);\n  }\n\n  override checkNoChanges(): void {\n    checkNoChangesInRootView(this._view);\n  }\n\n  override get context(): T {\n    return null!;\n  }\n}\n"]}