@angular/core
Version:
Angular - the core framework
338 lines • 35.9 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 { assertDefined } from '../util/assert';
import { checkNoChangesInRootView, checkNoChangesInternal, detectChangesInRootView, detectChangesInternal, markViewDirty, storeCleanupWithContext } from './instructions/shared';
import { CONTAINER_HEADER_OFFSET } from './interfaces/container';
import { isLContainer } from './interfaces/type_checks';
import { CONTEXT, DECLARATION_COMPONENT_VIEW, FLAGS, HOST, T_HOST, TVIEW } from './interfaces/view';
import { assertNodeOfPossibleTypes } from './node_assert';
import { destroyLView, renderDetachView } from './node_manipulation';
import { getLViewParent } from './util/view_traversal_utils';
import { unwrapRNode } from './util/view_utils';
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._viewContainerRef = null;
}
get rootNodes() {
const lView = this._lView;
if (lView[HOST] == null) {
const hostTView = lView[T_HOST];
return collectNativeNodes(lView[TVIEW], lView, hostTView.child, []);
}
return [];
}
get context() {
return this._lView[CONTEXT];
}
get destroyed() {
return (this._lView[FLAGS] & 256 /* Destroyed */) === 256 /* Destroyed */;
}
destroy() {
if (this._appRef) {
this._appRef.detachView(this);
}
else if (this._viewContainerRef) {
const index = this._viewContainerRef.indexOf(this);
if (index > -1) {
this._viewContainerRef.detach(index);
}
this._viewContainerRef = null;
}
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.
*
* It also triggers change detection by calling `scheduleTick` internally, which coalesces
* multiple `markForCheck` calls to into one change detection run.
*
* 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: 'my-app',
* 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: 'my-app',
* 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(vcRef) {
if (this._appRef) {
throw new Error('This view is already attached directly to the ApplicationRef!');
}
this._viewContainerRef = vcRef;
}
detachFromAppRef() {
this._appRef = null;
renderDetachView(this._lView[TVIEW], this._lView);
}
attachToAppRef(appRef) {
if (this._viewContainerRef) {
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;
}
}
function collectNativeNodes(tView, lView, tNode, result, isProjection = false) {
while (tNode !== null) {
ngDevMode && assertNodeOfPossibleTypes(tNode, [
3 /* Element */, 0 /* Container */, 1 /* Projection */, 4 /* ElementContainer */,
5 /* IcuContainer */
]);
const lNode = lView[tNode.index];
if (lNode !== null) {
result.push(unwrapRNode(lNode));
}
// A given lNode can represent either a native node or a LContainer (when it is a host of a
// ViewContainerRef). When we find a LContainer we need to descend into it to collect root nodes
// from the views in this container.
if (isLContainer(lNode)) {
for (let i = CONTAINER_HEADER_OFFSET; i < lNode.length; i++) {
const lViewInAContainer = lNode[i];
const lViewFirstChildTNode = lViewInAContainer[TVIEW].firstChild;
if (lViewFirstChildTNode !== null) {
collectNativeNodes(lViewInAContainer[TVIEW], lViewInAContainer, lViewFirstChildTNode, result);
}
}
}
const tNodeType = tNode.type;
if (tNodeType === 4 /* ElementContainer */ || tNodeType === 5 /* IcuContainer */) {
collectNativeNodes(tView, lView, tNode.child, result);
}
else if (tNodeType === 1 /* Projection */) {
const componentView = lView[DECLARATION_COMPONENT_VIEW];
const componentHost = componentView[T_HOST];
const slotIdx = tNode.projection;
ngDevMode &&
assertDefined(componentHost.projection, 'Components with projection nodes (<ng-content>) must have projection slots defined.');
const nodesInSlot = componentHost.projection[slotIdx];
if (Array.isArray(nodesInSlot)) {
result.push(...nodesInSlot);
}
else {
const parentView = getLViewParent(componentView);
ngDevMode &&
assertDefined(parentView, 'Component views should always have a parent view (component\'s host view)');
collectNativeNodes(parentView[TVIEW], parentView, nodesInSlot, result, true);
}
}
tNode = isProjection ? tNode.projectionNext : tNode.next;
}
return result;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {ApplicationRef} from '../application_ref';\nimport {ChangeDetectorRef as viewEngine_ChangeDetectorRef} from '../change_detection/change_detector_ref';\nimport {ViewContainerRef as viewEngine_ViewContainerRef} from '../linker/view_container_ref';\nimport {EmbeddedViewRef as viewEngine_EmbeddedViewRef, InternalViewRef as viewEngine_InternalViewRef} from '../linker/view_ref';\nimport {assertDefined} from '../util/assert';\nimport {checkNoChangesInRootView, checkNoChangesInternal, detectChangesInRootView, detectChangesInternal, markViewDirty, storeCleanupWithContext} from './instructions/shared';\nimport {CONTAINER_HEADER_OFFSET} from './interfaces/container';\nimport {TElementNode, TNode, TNodeType, TViewNode} from './interfaces/node';\nimport {isLContainer} from './interfaces/type_checks';\nimport {CONTEXT, DECLARATION_COMPONENT_VIEW, FLAGS, HOST, LView, LViewFlags, T_HOST, TVIEW, TView} from './interfaces/view';\nimport {assertNodeOfPossibleTypes} from './node_assert';\nimport {destroyLView, renderDetachView} from './node_manipulation';\nimport {getLViewParent} from './util/view_traversal_utils';\nimport {unwrapRNode} from './util/view_utils';\n\n\n\n// Needed due to tsickle downleveling where multiple `implements` with classes creates\n// multiple @extends in Closure annotations, which is illegal. 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: ApplicationRef|null = null;\n  private _viewContainerRef: viewEngine_ViewContainerRef|null = null;\n\n  get rootNodes(): any[] {\n    const lView = this._lView;\n    if (lView[HOST] == null) {\n      const hostTView = lView[T_HOST] as TViewNode;\n      return collectNativeNodes(lView[TVIEW], lView, hostTView.child, []);\n    }\n    return [];\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  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._viewContainerRef) {\n      const index = this._viewContainerRef.indexOf(this);\n\n      if (index > -1) {\n        this._viewContainerRef.detach(index);\n      }\n\n      this._viewContainerRef = null;\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   * It also triggers change detection by calling `scheduleTick` internally, which coalesces\n   * multiple `markForCheck` calls to into one change detection run.\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: 'my-app',\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: 'my-app',\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(vcRef: viewEngine_ViewContainerRef) {\n    if (this._appRef) {\n      throw new Error('This view is already attached directly to the ApplicationRef!');\n    }\n    this._viewContainerRef = vcRef;\n  }\n\n  detachFromAppRef() {\n    this._appRef = null;\n    renderDetachView(this._lView[TVIEW], this._lView);\n  }\n\n  attachToAppRef(appRef: ApplicationRef) {\n    if (this._viewContainerRef) {\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  detectChanges(): void {\n    detectChangesInRootView(this._view);\n  }\n\n  checkNoChanges(): void {\n    checkNoChangesInRootView(this._view);\n  }\n\n  get context(): T {\n    return null!;\n  }\n}\n\nfunction collectNativeNodes(\n    tView: TView, lView: LView, tNode: TNode|null, result: any[],\n    isProjection: boolean = false): any[] {\n  while (tNode !== null) {\n    ngDevMode && assertNodeOfPossibleTypes(tNode, [\n      TNodeType.Element, TNodeType.Container, TNodeType.Projection, TNodeType.ElementContainer,\n      TNodeType.IcuContainer\n    ]);\n\n    const lNode = lView[tNode.index];\n    if (lNode !== null) {\n      result.push(unwrapRNode(lNode));\n    }\n\n    // A given lNode can represent either a native node or a LContainer (when it is a host of a\n    // ViewContainerRef). When we find a LContainer we need to descend into it to collect root nodes\n    // from the views in this container.\n    if (isLContainer(lNode)) {\n      for (let i = CONTAINER_HEADER_OFFSET; i < lNode.length; i++) {\n        const lViewInAContainer = lNode[i];\n        const lViewFirstChildTNode = lViewInAContainer[TVIEW].firstChild;\n        if (lViewFirstChildTNode !== null) {\n          collectNativeNodes(\n              lViewInAContainer[TVIEW], lViewInAContainer, lViewFirstChildTNode, result);\n        }\n      }\n    }\n\n    const tNodeType = tNode.type;\n    if (tNodeType === TNodeType.ElementContainer || tNodeType === TNodeType.IcuContainer) {\n      collectNativeNodes(tView, lView, tNode.child, result);\n    } else if (tNodeType === TNodeType.Projection) {\n      const componentView = lView[DECLARATION_COMPONENT_VIEW];\n      const componentHost = componentView[T_HOST] as TElementNode;\n      const slotIdx = tNode.projection as number;\n      ngDevMode &&\n          assertDefined(\n              componentHost.projection,\n              'Components with projection nodes (<ng-content>) must have projection slots defined.');\n\n      const nodesInSlot = componentHost.projection![slotIdx];\n      if (Array.isArray(nodesInSlot)) {\n        result.push(...nodesInSlot);\n      } else {\n        const parentView = getLViewParent(componentView)!;\n        ngDevMode &&\n            assertDefined(\n                parentView,\n                'Component views should always have a parent view (component\\'s host view)');\n        collectNativeNodes(parentView[TVIEW], parentView, nodesInSlot, result, true);\n      }\n    }\n    tNode = isProjection ? tNode.projectionNext : tNode.next;\n  }\n\n  return result;\n}\n"]}