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* Copyright 2020 Adobe. All rights reserved.
* This file is licensed to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under
* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
* OF ANY KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
import {
Directive,
Input,
Renderer2,
ViewContainerRef,
ComponentFactoryResolver,
ComponentRef,
AfterViewInit,
OnInit,
OnDestroy, ChangeDetectorRef, OnChanges
} from '@angular/core';
import { ComponentMapping } from './component-mapping';
import { Constants } from './constants';
import { Utils } from './utils';
/**
* @private
*/
const PLACEHOLDER_CLASS_NAME = 'cq-placeholder';
@Directive({
selector: '[aemComponent]'
})
/**
* The current directive provides advanced capabilities among which are
*
* - The management of the component placeholder in the Page Editor
* - The dynamic instantiation of components based on a component definition
* - The conversion from model fields to properties and injection in the component instance
* - The management of HTMLElement attributes and class names on the native element
*/
export class AEMComponentDirective implements AfterViewInit, OnInit, OnDestroy, OnChanges {
/**
* Dynamically created component
*/
private _component: ComponentRef<any>;
/**
* Model item that corresponds to the current component
*/
private _cqItem: any;
get cqItem(): any {
return this._cqItem;
}
@Input()
set cqItem(value: any) {
this._cqItem = value;
}
get changeDetectorRef(): ChangeDetectorRef {
return this._changeDetectorRef;
}
/**
* Path to the model structure associated with the current component
*/
@Input() cqPath: string;
/**
* Name of the current instance of the component
*/
@Input() itemName: string;
/**
* HtmlElement attributes for the current instance of the component
*/
@Input() itemAttrs: any;
@Input() aemComponent;
constructor(
private renderer: Renderer2,
private viewContainer: ViewContainerRef,
private factoryResolver: ComponentFactoryResolver,
private _changeDetectorRef: ChangeDetectorRef) {
}
ngOnInit(): void {
this.renderComponent(ComponentMapping.get(this.type));
}
ngOnChanges(): void {
this.updateComponentData();
}
/**
* Returns the type of the cqItem if exists.
*/
get type(): string | undefined {
return this.cqItem && this.cqItem[Constants.TYPE_PROP];
}
/**
* Renders a component dynamically based on the component definition
*
* @param componentDefinition The component definition to render
*/
private renderComponent(componentDefinition: any) {
if (componentDefinition) {
const factory = this.factoryResolver.resolveComponentFactory(componentDefinition);
this.viewContainer.clear();
this._component = this.viewContainer.createComponent(factory);
this.updateComponentData();
}
}
/**
* Updates the data of the component based the data of the directive
*/
private updateComponentData() {
if (!this._component || !this._component.instance) {
return;
}
const keys = Object.getOwnPropertyNames(this.cqItem);
keys.forEach((key) => {
let propKey = key;
if (propKey.startsWith(':')) {
// Transformation of internal properties namespaced with [:] to [cq]
// :myProperty => cqMyProperty
const tempKey = propKey.substr(1);
propKey = 'cq' + tempKey.substr(0, 1).toUpperCase() + tempKey.substr(1);
}
this._component.instance[propKey] = this.cqItem[key];
});
this._component.instance.cqPath = this.cqPath;
this._component.instance.itemName = this.itemName;
const editConfig = ComponentMapping.getEditConfig(this.type);
if (editConfig && Utils.isInEditor) {
this.setupPlaceholder(editConfig);
}
this._changeDetectorRef.detectChanges();
}
/**
* Adds the specified item attributes to the element
*/
private setupItemAttrs() {
Iif (this.itemAttrs) {
const keys = Object.getOwnPropertyNames(this.itemAttrs);
keys.forEach((key) => {
if (key === 'class') {
const classes = this.itemAttrs[key].split(' ');
classes.forEach((itemClass) => {
this.renderer.addClass(this._component.location.nativeElement, itemClass);
});
} else {
this.renderer.setAttribute(this._component.location.nativeElement, key, this.itemAttrs[key]);
}
});
}
}
/**
* Determines if the placeholder should e displayed.
*
* @param editConfig - the edit config of the directive
*/
private usePlaceholder(editConfig) {
return editConfig.isEmpty && typeof editConfig.isEmpty === 'function' && editConfig.isEmpty(this.cqItem);
}
/**
* Setups the placeholder of needed for the AEM editor
*
* @param editConfig - the editConfig, which will dictate the classes to be added on.
*/
private setupPlaceholder(editConfig) {
if (this.usePlaceholder(editConfig)) {
this.renderer.addClass(this._component.location.nativeElement, PLACEHOLDER_CLASS_NAME);
this.renderer.setAttribute(this._component.location.nativeElement, 'data-emptytext', editConfig.emptyLabel);
} else {
this.renderer.removeClass(this._component.location.nativeElement, PLACEHOLDER_CLASS_NAME);
this.renderer.removeAttribute(this._component.location.nativeElement, 'data-emptytext');
}
}
ngAfterViewInit(): void {
this.setupItemAttrs();
}
ngOnDestroy(): void {
this._component && this._component.destroy();
}
}
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