source: trip-planner-front/node_modules/@angular/common/esm2015/src/directives/ng_template_outlet.js

/**
 * @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 { Directive, Input, ViewContainerRef } from '@angular/core';
/**
 * @ngModule CommonModule
 *
 * @description
 *
 * Inserts an embedded view from a prepared `TemplateRef`.
 *
 * You can attach a context object to the `EmbeddedViewRef` by setting `[ngTemplateOutletContext]`.
 * `[ngTemplateOutletContext]` should be an object, the object's keys will be available for binding
 * by the local template `let` declarations.
 *
 * @usageNotes
 * ```
 * <ng-container *ngTemplateOutlet="templateRefExp; context: contextExp"></ng-container>
 * ```
 *
 * Using the key `$implicit` in the context object will set its value as default.
 *
 * ### Example
 *
 * {@example common/ngTemplateOutlet/ts/module.ts region='NgTemplateOutlet'}
 *
 * @publicApi
 */
export class NgTemplateOutlet {
    constructor(_viewContainerRef) {
        this._viewContainerRef = _viewContainerRef;
        this._viewRef = null;
        /**
         * A context object to attach to the {@link EmbeddedViewRef}. This should be an
         * object, the object's keys will be available for binding by the local template `let`
         * declarations.
         * Using the key `$implicit` in the context object will set its value as default.
         */
        this.ngTemplateOutletContext = null;
        /**
         * A string defining the template reference and optionally the context object for the template.
         */
        this.ngTemplateOutlet = null;
    }
    ngOnChanges(changes) {
        if (changes['ngTemplateOutlet']) {
            const viewContainerRef = this._viewContainerRef;
            if (this._viewRef) {
                viewContainerRef.remove(viewContainerRef.indexOf(this._viewRef));
            }
            this._viewRef = this.ngTemplateOutlet ?
                viewContainerRef.createEmbeddedView(this.ngTemplateOutlet, this.ngTemplateOutletContext) :
                null;
        }
        else if (this._viewRef && changes['ngTemplateOutletContext'] && this.ngTemplateOutletContext) {
            this._viewRef.context = this.ngTemplateOutletContext;
        }
    }
}
NgTemplateOutlet.decorators = [
    { type: Directive, args: [{ selector: '[ngTemplateOutlet]' },] }
];
NgTemplateOutlet.ctorParameters = () => [
    { type: ViewContainerRef }
];
NgTemplateOutlet.propDecorators = {
    ngTemplateOutletContext: [{ type: Input }],
    ngTemplateOutlet: [{ type: Input }]
};
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