/
di.ts
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di.ts
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/**
* @license
* Copyright Google Inc. 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 {InjectionToken} from '../di/injection_token';
import {Type} from '../interface/type';
import {makePropDecorator} from '../util/decorators';
/**
* A DI token that you can use to create a virtual [provider](guide/glossary#provider)
* that will populate the `entryComponents` field of components and NgModules
* based on its `useValue` property value.
* All components that are referenced in the `useValue` value (either directly
* or in a nested array or map) are added to the `entryComponents` property.
*
* @usageNotes
*
* The following example shows how the router can populate the `entryComponents`
* field of an NgModule based on a router configuration that refers
* to components.
*
* ```typescript
* // helper function inside the router
* function provideRoutes(routes) {
* return [
* {provide: ROUTES, useValue: routes},
* {provide: ANALYZE_FOR_ENTRY_COMPONENTS, useValue: routes, multi: true}
* ];
* }
*
* // user code
* let routes = [
* {path: '/root', component: RootComp},
* {path: '/teams', component: TeamsComp}
* ];
*
* @NgModule({
* providers: [provideRoutes(routes)]
* })
* class ModuleWithRoutes {}
* ```
*
* @publicApi
*/
export const ANALYZE_FOR_ENTRY_COMPONENTS = new InjectionToken<any>('AnalyzeForEntryComponents');
/**
* Type of the `Attribute` decorator / constructor function.
*
* @publicApi
*/
export interface AttributeDecorator {
/**
* Specifies that a constant attribute value should be injected.
*
* The directive can inject constant string literals of host element attributes.
*
* @usageNotes
* ### Example
*
* Suppose we have an `<input>` element and want to know its `type`.
*
* ```html
* <input type="text">
* ```
*
* A decorator can inject string literal `text` as in the following example.
*
* {@example core/ts/metadata/metadata.ts region='attributeMetadata'}
*
* @publicApi
*/
(name: string): any;
new (name: string): Attribute;
}
/**
* Type of the Attribute metadata.
*
* @publicApi
*/
export interface Attribute {
/**
* The name of the attribute to be injected into the constructor.
*/
attributeName?: string;
}
/**
* Type of the Query metadata.
*
* @publicApi
*/
export interface Query {
descendants: boolean;
first: boolean;
read: any;
isViewQuery: boolean;
selector: any;
static?: boolean;
}
/**
* Base class for query metadata.
*
* @see `ContentChildren`.
* @see `ContentChild`.
* @see `ViewChildren`.
* @see `ViewChild`.
*
* @publicApi
*/
export abstract class Query {}
/**
* Type of the ContentChildren decorator / constructor function.
*
* @see `ContentChildren`.
* @publicApi
*/
export interface ContentChildrenDecorator {
/**
* Configures a content query.
*
* You can use ContentChildren to get the `QueryList` of elements or directives from the
* content DOM. Any time a child element is added, removed, or moved, the query list will be
* updated, and the changes observable of the query list will emit a new value.
*
* Content queries are set before the `ngAfterContentInit` callback is called.
*
* **Metadata Properties**:
*
* * **selector** - the directive type or the name used for querying.
* * **descendants** - include only direct children or all descendants.
* * **read** - read a different token from the queried elements.
*
* @usageNotes
* ### Basic Example
*
* Here is a simple demonstration of how the `ContentChildren` decorator can be used.
*
* {@example core/di/ts/contentChildren/content_children_howto.ts region='HowTo'}
*
* ### Tab-pane Example
*
* Here is a slightly more realistic example that shows how `ContentChildren` decorators
* can be used to implement a tab pane component.
*
* {@example core/di/ts/contentChildren/content_children_example.ts region='Component'}
*
* @Annotation
*/
(selector: Type<any>|Function|string, opts?: {descendants?: boolean, read?: any}): any;
new (selector: Type<any>|Function|string, opts?: {descendants?: boolean, read?: any}): Query;
}
/**
* Type of the ContentChildren metadata.
*
*
* @Annotation
* @publicApi
*/
export type ContentChildren = Query;
/**
* ContentChildren decorator and metadata.
*
*
* @Annotation
* @publicApi
*/
export const ContentChildren: ContentChildrenDecorator = makePropDecorator(
'ContentChildren',
(selector?: any, data: any = {}) =>
({selector, first: false, isViewQuery: false, descendants: false, ...data}),
Query);
/**
* Type of the ContentChild decorator / constructor function.
*
* @publicApi
*/
export interface ContentChildDecorator {
/**
* Configures a content query.
*
* You can use ContentChild to get the first element or the directive matching the selector from
* the content DOM. If the content DOM changes, and a new child matches the selector,
* the property will be updated.
*
* Content queries are set before the `ngAfterContentInit` callback is called.
*
* **Metadata Properties**:
*
* * **selector** - the directive type or the name used for querying.
* * **read** - read a different token from the queried element.
* * **static** - whether or not to resolve query results before change detection runs (i.e.
* return static results only). If this option is not provided, the compiler will fall back
* to its default behavior, which is to use query results to determine the timing of query
* resolution. If any query results are inside a nested view (e.g. *ngIf), the query will be
* resolved after change detection runs. Otherwise, it will be resolved before change detection
* runs.
*
* @usageNotes
* ### Example
*
* {@example core/di/ts/contentChild/content_child_howto.ts region='HowTo'}
*
* ### Example
*
* {@example core/di/ts/contentChild/content_child_example.ts region='Component'}
*
* @Annotation
*/
(selector: Type<any>|Function|string, opts?: {read?: any, static?: boolean}): any;
new (selector: Type<any>|Function|string, opts?: {read?: any, static?: boolean}): ContentChild;
}
/**
* Type of the ContentChild metadata.
*
* @publicApi
*/
export type ContentChild = Query;
/**
* ContentChild decorator and metadata.
*
*
* @Annotation
*
* @publicApi
*/
export const ContentChild: ContentChildDecorator = makePropDecorator(
'ContentChild', (selector?: any, data: any = {}) =>
({selector, first: true, isViewQuery: false, descendants: true, ...data}),
Query);
/**
* Type of the ViewChildren decorator / constructor function.
*
* @see `ViewChildren`.
*
* @publicApi
*/
export interface ViewChildrenDecorator {
/**
* Configures a view query.
*
* You can use ViewChildren to get the `QueryList` of elements or directives from the
* view DOM. Any time a child element is added, removed, or moved, the query list will be updated,
* and the changes observable of the query list will emit a new value.
*
* View queries are set before the `ngAfterViewInit` callback is called.
*
* **Metadata Properties**:
*
* * **selector** - the directive type or the name used for querying.
* * **read** - read a different token from the queried elements.
*
* @usageNotes
*
* ### Example
*
* {@example core/di/ts/viewChildren/view_children_howto.ts region='HowTo'}
*
* ### Example
*
* {@example core/di/ts/viewChildren/view_children_example.ts region='Component'}
*
* @Annotation
*/
(selector: Type<any>|Function|string, opts?: {read?: any}): any;
new (selector: Type<any>|Function|string, opts?: {read?: any}): ViewChildren;
}
/**
* Type of the ViewChildren metadata.
*
* @publicApi
*/
export type ViewChildren = Query;
/**
* ViewChildren decorator and metadata.
*
* @Annotation
* @publicApi
*/
export const ViewChildren: ViewChildrenDecorator = makePropDecorator(
'ViewChildren', (selector?: any, data: any = {}) =>
({selector, first: false, isViewQuery: true, descendants: true, ...data}),
Query);
/**
* Type of the ViewChild decorator / constructor function.
*
* @see `ViewChild`.
* @publicApi
*/
export interface ViewChildDecorator {
/**
* @description
* Property decorator that configures a view query.
* The change detector looks for the first element or the directive matching the selector
* in the view DOM. If the view DOM changes, and a new child matches the selector,
* the property is updated.
*
* View queries are set before the `ngAfterViewInit` callback is called.
*
* **Metadata Properties**:
*
* * **selector** - the directive type or the name used for querying.
* * **read** - read a different token from the queried elements.
* * **static** - whether or not to resolve query results before change detection runs (i.e.
* return static results only). If this option is not provided, the compiler will fall back
* to its default behavior, which is to use query results to determine the timing of query
* resolution. If any query results are inside a nested view (e.g. *ngIf), the query will be
* resolved after change detection runs. Otherwise, it will be resolved before change detection
* runs.
*
* Supported selectors include:
* * any class with the `@Component` or `@Directive` decorator
* * a template reference variable as a string (e.g. query `<my-component #cmp></my-component>`
* with `@ViewChild('cmp')`)
* * any provider defined in the child component tree of the current component (e.g.
* `@ViewChild(SomeService) someService: SomeService`)
* * any provider defined through a string token (e.g. `@ViewChild('someToken') someTokenVal:
* any`)
* * a `TemplateRef` (e.g. query `<ng-template></ng-template>` with `@ViewChild(TemplateRef)
* template;`)
*
* @usageNotes
*
* {@example core/di/ts/viewChild/view_child_example.ts region='Component'}
*
* ### Example
*
* {@example core/di/ts/viewChild/view_child_howto.ts region='HowTo'}
*
* ### Example
*
* {@example core/di/ts/viewChild/view_child_example.ts region='Component'}
*
* @Annotation
*/
(selector: Type<any>|Function|string, opts?: {read?: any, static?: boolean}): any;
new (selector: Type<any>|Function|string, opts?: {read?: any, static?: boolean}): ViewChild;
}
/**
* Type of the ViewChild metadata.
*
* @publicApi
*/
export type ViewChild = Query;
/**
* ViewChild decorator and metadata.
*
* @Annotation
* @publicApi
*/
export const ViewChild: ViewChildDecorator = makePropDecorator(
'ViewChild', (selector: any, data: any) =>
({selector, first: true, isViewQuery: true, descendants: true, ...data}),
Query);