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feat(NgTemplateOutlet): add context to NgTemplateOutlet

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Closes #9042
This commit is contained in:
Shlomi Assaf
2016-06-06 19:03:32 +03:00
committed by Misko Hevery
parent 4ed6cf7519
commit 164a091c71
3 changed files with 118 additions and 8 deletions
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39
modules/@angular/common/src/directives/ng_template_outlet.ts
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@ -1,30 +1,53 @@
import {Directive, Input, TemplateRef, ViewContainerRef, ViewRef} from '@angular/core';
import {Directive, Input, TemplateRef, ViewContainerRef, EmbeddedViewRef} from '@angular/core';
import {isPresent} from '../facade/lang';
/**
* Creates and inserts an embedded view based on a prepared `TemplateRef`.
* You can attach a context object to the `EmbeddedViewRef` by setting `[ngOutletContext]`.
* `[ngOutletContext]` should be an object, the object's keys will be the local template variables
* available within the `TemplateRef`.
*
* Note: using the key `$implicit` in the context object will set it's value as default.
*
* ### Syntax
* - `<template [ngTemplateOutlet]="templateRefExpression"></template>`
* - `<template [ngTemplateOutlet]="templateRefExpression" [ngOutletContext]="objectExpression"></template>`
*
* @experimental
*/
@Directive({selector: '[ngTemplateOutlet]'})
export class NgTemplateOutlet {
private _insertedViewRef: ViewRef;
private _viewRef: EmbeddedViewRef<any>;
private _context: Object;
private _templateRef: TemplateRef<any>;
constructor(private _viewContainerRef: ViewContainerRef) {}
@Input()
set ngOutletContext(context: Object) {
if (this._context !== context) {
this._context = context;
if (isPresent(this._viewRef)) {
this.createView();
}
}
}
@Input()
set ngTemplateOutlet(templateRef: TemplateRef<Object>) {
if (isPresent(this._insertedViewRef)) {
this._viewContainerRef.remove(this._viewContainerRef.indexOf(this._insertedViewRef));
if (this._templateRef !== templateRef) {
this._templateRef = templateRef;
this.createView();
}
}
private createView() {
if (isPresent(this._viewRef)) {
this._viewContainerRef.remove(this._viewContainerRef.indexOf(this._viewRef));
}
if (isPresent(templateRef)) {
this._insertedViewRef = this._viewContainerRef.createEmbeddedView(templateRef);
if (isPresent(this._templateRef)) {
this._viewRef = this._viewContainerRef.createEmbeddedView(this._templateRef, this._context);
}
}
}