@angular/core
Version:
Angular - the core framework
86 lines • 12.7 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 { assertLContainer } from '../render3/assert';
import { createLView, renderView } from '../render3/instructions/shared';
import { DECLARATION_LCONTAINER, QUERIES } from '../render3/interfaces/view';
import { getCurrentTNode, getLView } from '../render3/state';
import { ViewRef as R3_ViewRef } from '../render3/view_ref';
import { assertDefined } from '../util/assert';
import { createElementRef } from './element_ref';
/**
* Represents an embedded template that can be used to instantiate embedded views.
* To instantiate embedded views based on a template, use the `ViewContainerRef`
* method `createEmbeddedView()`.
*
* Access a `TemplateRef` instance by placing a directive on an `<ng-template>`
* element (or directive prefixed with `*`). The `TemplateRef` for the embedded view
* is injected into the constructor of the directive,
* using the `TemplateRef` token.
*
* You can also use a `Query` to find a `TemplateRef` associated with
* a component or a directive.
*
* @see `ViewContainerRef`
* @see [Navigate the Component Tree with DI](guide/dependency-injection-navtree)
*
* @publicApi
*/
export class TemplateRef {
}
/**
* @internal
* @nocollapse
*/
TemplateRef.__NG_ELEMENT_ID__ = injectTemplateRef;
const ViewEngineTemplateRef = TemplateRef;
// TODO(alxhub): combine interface and implementation. Currently this is challenging since something
// in g3 depends on them being separate.
const R3TemplateRef = class TemplateRef extends ViewEngineTemplateRef {
constructor(_declarationLView, _declarationTContainer, elementRef) {
super();
this._declarationLView = _declarationLView;
this._declarationTContainer = _declarationTContainer;
this.elementRef = elementRef;
}
createEmbeddedView(context) {
const embeddedTView = this._declarationTContainer.tViews;
const embeddedLView = createLView(this._declarationLView, embeddedTView, context, 16 /* CheckAlways */, null, embeddedTView.declTNode, null, null, null, null);
const declarationLContainer = this._declarationLView[this._declarationTContainer.index];
ngDevMode && assertLContainer(declarationLContainer);
embeddedLView[DECLARATION_LCONTAINER] = declarationLContainer;
const declarationViewLQueries = this._declarationLView[QUERIES];
if (declarationViewLQueries !== null) {
embeddedLView[QUERIES] = declarationViewLQueries.createEmbeddedView(embeddedTView);
}
renderView(embeddedTView, embeddedLView, context);
return new R3_ViewRef(embeddedLView);
}
};
/**
* Creates a TemplateRef given a node.
*
* @returns The TemplateRef instance to use
*/
export function injectTemplateRef() {
return createTemplateRef(getCurrentTNode(), getLView());
}
/**
* Creates a TemplateRef and stores it on the injector.
*
* @param hostTNode The node on which a TemplateRef is requested
* @param hostLView The `LView` to which the node belongs
* @returns The TemplateRef instance or null if we can't create a TemplateRef on a given node type
*/
export function createTemplateRef(hostTNode, hostLView) {
if (hostTNode.type & 4 /* Container */) {
ngDevMode && assertDefined(hostTNode.tViews, 'TView must be allocated');
return new R3TemplateRef(hostLView, hostTNode, createElementRef(hostTNode, hostLView));
}
return null;
}
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The `TemplateRef` for the embedded view\n * is injected into the constructor of the directive,\n * using the `TemplateRef` token.\n *\n * You can also use a `Query` to find a `TemplateRef` associated with\n * a component or a directive.\n *\n * @see `ViewContainerRef`\n * @see [Navigate the Component Tree with DI](guide/dependency-injection-navtree)\n *\n * @publicApi\n */\nexport abstract class TemplateRef<C> {\n  /**\n   * The anchor element in the parent view for this embedded view.\n   *\n   * The data-binding and injection contexts of embedded views created from this `TemplateRef`\n   * inherit from the contexts of this location.\n   *\n   * Typically new embedded views are attached to the view container of this location, but in\n   * advanced use-cases, the view can be attached to a different container while keeping the\n   * data-binding and injection context from the original location.\n   *\n   */\n  // TODO(i): rename to anchor or location\n  abstract readonly elementRef: ElementRef;\n\n  /**\n   * Instantiates an embedded view based on this template,\n   * and attaches it to the view container.\n   * @param context The data-binding context of the embedded view, as declared\n   * in the `<ng-template>` usage.\n   * @returns The new embedded view object.\n   */\n  abstract createEmbeddedView(context: C): EmbeddedViewRef<C>;\n\n  /**\n   * @internal\n   * @nocollapse\n   */\n  static __NG_ELEMENT_ID__: () => TemplateRef<any>| null = injectTemplateRef;\n}\n\nconst ViewEngineTemplateRef = TemplateRef;\n\n// TODO(alxhub): combine interface and implementation. Currently this is challenging since something\n// in g3 depends on them being separate.\nconst R3TemplateRef = class TemplateRef<T> extends ViewEngineTemplateRef<T> {\n  constructor(\n      private _declarationLView: LView, private _declarationTContainer: TContainerNode,\n      public override elementRef: ElementRef) {\n    super();\n  }\n\n  override createEmbeddedView(context: T): EmbeddedViewRef<T> {\n    const embeddedTView = this._declarationTContainer.tViews as TView;\n    const embeddedLView = createLView(\n        this._declarationLView, embeddedTView, context, LViewFlags.CheckAlways, null,\n        embeddedTView.declTNode, null, null, null, null);\n\n    const declarationLContainer = this._declarationLView[this._declarationTContainer.index];\n    ngDevMode && assertLContainer(declarationLContainer);\n    embeddedLView[DECLARATION_LCONTAINER] = declarationLContainer;\n\n    const declarationViewLQueries = this._declarationLView[QUERIES];\n    if (declarationViewLQueries !== null) {\n      embeddedLView[QUERIES] = declarationViewLQueries.createEmbeddedView(embeddedTView);\n    }\n\n    renderView(embeddedTView, embeddedLView, context);\n\n    return new R3_ViewRef<T>(embeddedLView);\n  }\n};\n\n/**\n * Creates a TemplateRef given a node.\n *\n * @returns The TemplateRef instance to use\n */\nexport function injectTemplateRef<T>(): TemplateRef<T>|null {\n  return createTemplateRef<T>(getCurrentTNode()!, getLView());\n}\n\n/**\n * Creates a TemplateRef and stores it on the injector.\n *\n * @param hostTNode The node on which a TemplateRef is requested\n * @param hostLView The `LView` to which the node belongs\n * @returns The TemplateRef instance or null if we can't create a TemplateRef on a given node type\n */\nexport function createTemplateRef<T>(hostTNode: TNode, hostLView: LView): TemplateRef<T>|null {\n  if (hostTNode.type & TNodeType.Container) {\n    ngDevMode && assertDefined(hostTNode.tViews, 'TView must be allocated');\n    return new R3TemplateRef(\n        hostLView, hostTNode as TContainerNode, createElementRef(hostTNode, hostLView));\n  }\n  return null;\n}\n"]}