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droppable.directive.ts
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droppable.directive.ts
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import {Directive, ElementRef, EventEmitter, Input, OnDestroy, OnInit, Output, Renderer2} from '@angular/core';
import {DragService} from './drag.service';
// 1
@Directive({
selector: '[appDroppable]'
})
export class DroppableDirective implements OnInit, OnDestroy {
private onDragEnter: Function;
private onDragLeave: Function;
private onDragOver: Function;
private onDrop: Function;
public options: DroppableOptions = {
zone: 'appZone'
};
// Allow options input by using [appDroppable]='{}'
// 2
@Input()
set appDroppable(options: DroppableOptions) {
if (options) {
this.options = options;
}
}
// Drop Event Emitter
@Output() public onDroppableComplete: EventEmitter<DroppableEventObject> = new EventEmitter();
// 3
constructor(private elementRef: ElementRef
, private renderer: Renderer2
, private dragService: DragService) {
this.renderer.addClass(this.elementRef.nativeElement, 'app-droppable');
}
// 4
ngOnInit() {
// Add available zone
// This exposes the zone to the service so a draggable element can update it
this.dragService.addAvailableZone(this.options.zone, {
begin: () => {
this.renderer.addClass(this.elementRef.nativeElement, 'js-app-droppable--target');
},
end: () => {
this.renderer.removeClass(this.elementRef.nativeElement, 'js-app-droppable--target');
}
});
this.addOnDragEvents();
}
// 5
ngOnDestroy() {
// Remove zone
this.dragService.removeAvailableZone(this.options.zone);
// Remove events
this.onDragEnter();
this.onDragLeave();
this.onDragOver();
this.onDrop();
}
/**
* @desc responsible for adding the drag events
*/
// 6
private addOnDragEvents(): void {
// Drag Enter
this.onDragEnter = this.renderer.listen(
this.elementRef.nativeElement
, 'dragenter'
, (event: DragEvent): void => {
this.handleDragEnter(event);
});
this.onDragLeave = this.renderer.listen(
this.elementRef.nativeElement
, 'dragleave'
, (event: DragEvent): void => {
this.handleDragLeave(event);
});
// Drag Over
this.onDragOver = this.renderer.listen(
this.elementRef.nativeElement
, 'dragover'
, (event: DragEvent): void => {
this.handleDragOver(event);
});
// Drag Drop
this.onDrop = this.renderer.listen(
this.elementRef.nativeElement
, 'drop'
, (event: DragEvent): void => {
this.handleDrop(event);
});
}
/**
* @desc responsible for handling the dragenter event
* @param event
*/
// 7
private handleDragEnter(event: DragEvent): void {
if (this.dragService.accepts(this.options.zone)) {
// Prevent default to allow drop
event.preventDefault();
// Add styling
this.renderer.addClass(event.target, 'js-app-droppable--zone');
}
}
/**
* @desc responsible for handling the dragleave event
* @param event
*/
// 8
private handleDragLeave(event: DragEvent): void {
if (this.dragService.accepts(this.options.zone)) {
// Remove styling
this.renderer.removeClass(event.target, 'js-app-droppable--zone');
}
}
/**
* @desc responsible for handling the dragOver event
* @param event
*/
// 9
private handleDragOver(event: DragEvent): void {
if (this.dragService.accepts(this.options.zone)) {
// Prevent default to allow drop
event.preventDefault();
}
}
/**
* @desc responsible for handling the drop event
* @param event
*/
// 10
private handleDrop(event: DragEvent): void {
// Remove styling
this.dragService.removeHighLightedAvailableZones();
this.renderer.removeClass(event.target, 'js-app-droppable--zone');
// Emit successful event
const data = JSON.parse(event.dataTransfer.getData('Text'));
this.onDroppableComplete.emit({
data: data,
zone: this.options.data
});
}
}
// 11
export interface DroppableOptions {
data?: any;
zone?: string;
}
// Droppable Event Object
export interface DroppableEventObject {
data: any;
zone: any;
}