forked from EVOgeek/Vmeda.Online
162 lines
6.6 KiB
TypeScript
162 lines
6.6 KiB
TypeScript
// (C) Copyright 2015 Martin Dougiamas
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import {
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Component, Input, OnInit, OnChanges, OnDestroy, ViewContainerRef, ViewChild, ComponentRef, SimpleChange, ChangeDetectorRef,
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ElementRef, Optional, Output, EventEmitter, DoCheck, KeyValueDiffers
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} from '@angular/core';
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import { NavController } from 'ionic-angular';
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import { CoreCompileProvider } from '../../providers/compile';
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import { CoreDomUtilsProvider } from '@providers/utils/dom';
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/**
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* This component has a behaviour similar to $compile for AngularJS. Given an HTML code, it will compile it so all its
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* components and directives are instantiated.
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*
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* IMPORTANT: Use this component only if it is a must. It will create and compile a new component and module everytime this
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* component is used, so it can slow down the app.
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*
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* This component has its own module to prevent circular dependencies. If you want to use it,
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* you need to import CoreCompileHtmlComponentModule.
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*
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* You can provide some Javascript code (as text) to be executed inside the component. The context of the javascript code (this)
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* will be the component instance created to compile the template. This means your javascript code can interact with the template.
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* The component instance will have most of the providers so you can use them in the javascript code. E.g. if you want to use
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* CoreAppProvider, you can do it with "this.CoreAppProvider".
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*/
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@Component({
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selector: 'core-compile-html',
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template: '<core-loading [hideUntil]="loaded"><ng-container #dynamicComponent></ng-container></core-loading>'
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})
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export class CoreCompileHtmlComponent implements OnChanges, OnDestroy, DoCheck {
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@Input() text: string; // The HTML text to display.
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@Input() javascript: string; // The Javascript to execute in the component.
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@Input() jsData: any; // Data to pass to the fake component.
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@Input() extraImports: any[] = []; // Extra import modules.
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@Input() extraProviders: any[] = []; // Extra providers.
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@Output() created: EventEmitter<any> = new EventEmitter(); // Will emit an event when the component is instantiated.
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// Get the container where to put the content.
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@ViewChild('dynamicComponent', { read: ViewContainerRef }) container: ViewContainerRef;
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loaded: boolean;
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protected componentRef: ComponentRef<any>;
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protected componentInstance: any;
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protected element;
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protected differ: any; // To detect changes in the jsData input.
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constructor(protected compileProvider: CoreCompileProvider, protected cdr: ChangeDetectorRef, element: ElementRef,
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@Optional() protected navCtrl: NavController, differs: KeyValueDiffers, protected domUtils: CoreDomUtilsProvider) {
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this.element = element.nativeElement;
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this.differ = differs.find([]).create();
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}
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/**
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* Detect and act upon changes that Angular can’t or won’t detect on its own (objects and arrays).
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*/
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ngDoCheck(): void {
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if (this.componentInstance) {
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// Check if there's any change in the jsData object.
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const changes = this.differ.diff(this.jsData);
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if (changes) {
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this.setInputData();
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if (this.componentInstance.ngOnChanges) {
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this.componentInstance.ngOnChanges(this.domUtils.createChangesFromKeyValueDiff(changes));
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}
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}
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}
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}
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/**
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* Detect changes on input properties.
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*/
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ngOnChanges(changes: { [name: string]: SimpleChange }): void {
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if ((changes.text || changes.javascript) && this.text) {
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// Create a new component and a new module.
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this.compileProvider.createAndCompileComponent(this.text, this.getComponentClass(), this.extraImports)
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.then((factory) => {
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// Destroy previous components.
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this.componentRef && this.componentRef.destroy();
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if (factory) {
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// Create the component.
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this.componentRef = this.container.createComponent(factory);
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this.created.emit(this.componentRef.instance);
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}
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this.loaded = true;
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});
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}
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}
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/**
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* Component destroyed.
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*/
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ngOnDestroy(): void {
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this.componentRef && this.componentRef.destroy();
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}
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/**
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* Get a class that defines the dynamic component.
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*
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* @return {any} The component class.
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*/
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protected getComponentClass(): any {
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// tslint:disable: no-this-assignment
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const compileInstance = this;
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// Create the component, using the text as the template.
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return class CoreCompileHtmlFakeComponent implements OnInit {
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constructor() {
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// Store this instance so it can be accessed by the outer component.
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compileInstance.componentInstance = this;
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// Create 2 empty properties that can be used by the template to store data.
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this['dataObject'] = {};
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this['dataArray'] = [];
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// Inject the libraries.
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compileInstance.compileProvider.injectLibraries(this, compileInstance.extraProviders);
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// Always add these elements, they could be needed on component init (componentObservable).
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this['ChangeDetectorRef'] = compileInstance.cdr;
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this['NavController'] = compileInstance.navCtrl;
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this['componentContainer'] = compileInstance.element;
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// Add the data passed to the component.
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compileInstance.setInputData();
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}
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ngOnInit(): void {
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// If there is some javascript to run, do it now.
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if (compileInstance.javascript) {
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compileInstance.compileProvider.executeJavascript(this, compileInstance.javascript);
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}
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}
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};
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}
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/**
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* Set the JS data as input data of the component instance.
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*/
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protected setInputData(): void {
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if (this.componentInstance) {
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for (const name in this.jsData) {
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this.componentInstance[name] = this.jsData[name];
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}
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}
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}
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}
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