@circlon/angular-tree-component
Version:
A simple yet powerful tree component for Angular
120 lines • 15.7 kB
JavaScript
import { Directive, ElementRef, EventEmitter, HostListener, Input, NgZone, Output, Renderer2 } from '@angular/core';
import { TreeDraggedElement } from '../models/tree-dragged-element.model';
const DRAG_OVER_CLASS = 'is-dragging-over';
const DRAG_DISABLED_CLASS = 'is-dragging-over-disabled';
export class TreeDropDirective {
constructor(el, renderer, treeDraggedElement, ngZone) {
this.el = el;
this.renderer = renderer;
this.treeDraggedElement = treeDraggedElement;
this.ngZone = ngZone;
this.allowDragoverStyling = true;
this.onDropCallback = new EventEmitter();
this.onDragOverCallback = new EventEmitter();
this.onDragLeaveCallback = new EventEmitter();
this.onDragEnterCallback = new EventEmitter();
this._allowDrop = (element, $event) => true;
this.dragOverEventHandler = this.onDragOver.bind(this);
this.dragEnterEventHandler = this.onDragEnter.bind(this);
this.dragLeaveEventHandler = this.onDragLeave.bind(this);
}
set treeAllowDrop(allowDrop) {
if (allowDrop instanceof Function) {
this._allowDrop = allowDrop;
}
else
this._allowDrop = (element, $event) => allowDrop;
}
allowDrop($event) {
return this._allowDrop(this.treeDraggedElement.get(), $event);
}
ngAfterViewInit() {
let el = this.el.nativeElement;
this.ngZone.runOutsideAngular(() => {
el.addEventListener('dragover', this.dragOverEventHandler);
el.addEventListener('dragenter', this.dragEnterEventHandler);
el.addEventListener('dragleave', this.dragLeaveEventHandler);
});
}
ngOnDestroy() {
let el = this.el.nativeElement;
el.removeEventListener('dragover', this.dragOverEventHandler);
el.removeEventListener('dragenter', this.dragEnterEventHandler);
el.removeEventListener('dragleave', this.dragLeaveEventHandler);
}
onDragOver($event) {
if (!this.allowDrop($event)) {
if (this.allowDragoverStyling) {
return this.addDisabledClass();
}
return;
}
this.onDragOverCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
$event.preventDefault();
if (this.allowDragoverStyling) {
this.addClass();
}
}
onDragEnter($event) {
if (!this.allowDrop($event))
return;
$event.preventDefault();
this.onDragEnterCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
}
onDragLeave($event) {
if (!this.allowDrop($event)) {
if (this.allowDragoverStyling) {
return this.removeDisabledClass();
}
return;
}
this.onDragLeaveCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
if (this.allowDragoverStyling) {
this.removeClass();
}
}
onDrop($event) {
if (!this.allowDrop($event))
return;
$event.preventDefault();
this.onDropCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
if (this.allowDragoverStyling) {
this.removeClass();
}
this.treeDraggedElement.set(null);
}
addClass() {
this.renderer.addClass(this.el.nativeElement, DRAG_OVER_CLASS);
}
removeClass() {
this.renderer.removeClass(this.el.nativeElement, DRAG_OVER_CLASS);
}
addDisabledClass() {
this.renderer.addClass(this.el.nativeElement, DRAG_DISABLED_CLASS);
}
removeDisabledClass() {
this.renderer.removeClass(this.el.nativeElement, DRAG_DISABLED_CLASS);
}
}
TreeDropDirective.decorators = [
{ type: Directive, args: [{
selector: '[treeDrop]'
},] }
];
/** @nocollapse */
TreeDropDirective.ctorParameters = () => [
{ type: ElementRef },
{ type: Renderer2 },
{ type: TreeDraggedElement },
{ type: NgZone }
];
TreeDropDirective.propDecorators = {
allowDragoverStyling: [{ type: Input }],
onDropCallback: [{ type: Output, args: ['treeDrop',] }],
onDragOverCallback: [{ type: Output, args: ['treeDropDragOver',] }],
onDragLeaveCallback: [{ type: Output, args: ['treeDropDragLeave',] }],
onDragEnterCallback: [{ type: Output, args: ['treeDropDragEnter',] }],
treeAllowDrop: [{ type: Input }],
onDrop: [{ type: HostListener, args: ['drop', ['$event'],] }]
};
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{\r\n  AfterViewInit,\r\n  Directive,\r\n  ElementRef,\r\n  EventEmitter,\r\n  HostListener,\r\n  Input,\r\n  NgZone,\r\n  OnDestroy,\r\n  Output,\r\n  Renderer2\r\n} from '@angular/core';\r\nimport { TreeDraggedElement } from '../models/tree-dragged-element.model';\r\n\r\nconst DRAG_OVER_CLASS = 'is-dragging-over';\r\nconst DRAG_DISABLED_CLASS = 'is-dragging-over-disabled';\r\n\r\n@Directive({\r\n  selector: '[treeDrop]'\r\n})\r\nexport class TreeDropDirective implements AfterViewInit, OnDestroy {\r\n  @Input() allowDragoverStyling = true;\r\n  @Output('treeDrop') onDropCallback = new EventEmitter();\r\n  @Output('treeDropDragOver') onDragOverCallback = new EventEmitter();\r\n  @Output('treeDropDragLeave') onDragLeaveCallback = new EventEmitter();\r\n  @Output('treeDropDragEnter') onDragEnterCallback = new EventEmitter();\r\n  private readonly dragOverEventHandler: (ev: DragEvent) => void;\r\n  private readonly dragEnterEventHandler: (ev: DragEvent) => void;\r\n  private readonly dragLeaveEventHandler: (ev: DragEvent) => void;\r\n\r\n  private _allowDrop = (element, $event) => true;\r\n\r\n  @Input() set treeAllowDrop(allowDrop) {\r\n    if (allowDrop instanceof Function) {\r\n      this._allowDrop = allowDrop;\r\n    }\r\n    else this._allowDrop = (element, $event) => allowDrop;\r\n  }\r\n\r\n  allowDrop($event) {\r\n    return this._allowDrop(this.treeDraggedElement.get(), $event);\r\n  }\r\n\r\n  constructor(private el: ElementRef, private renderer: Renderer2, private treeDraggedElement: TreeDraggedElement, private ngZone: NgZone) {\r\n    this.dragOverEventHandler = this.onDragOver.bind(this);\r\n    this.dragEnterEventHandler = this.onDragEnter.bind(this);\r\n    this.dragLeaveEventHandler = this.onDragLeave.bind(this);\r\n  }\r\n\r\n  ngAfterViewInit() {\r\n    let el: HTMLElement = this.el.nativeElement;\r\n    this.ngZone.runOutsideAngular(() => {\r\n      el.addEventListener('dragover', this.dragOverEventHandler);\r\n      el.addEventListener('dragenter', this.dragEnterEventHandler);\r\n      el.addEventListener('dragleave', this.dragLeaveEventHandler);\r\n    });\r\n  }\r\n\r\n  ngOnDestroy() {\r\n    let el: HTMLElement = this.el.nativeElement;\r\n    el.removeEventListener('dragover', this.dragOverEventHandler);\r\n    el.removeEventListener('dragenter', this.dragEnterEventHandler);\r\n    el.removeEventListener('dragleave', this.dragLeaveEventHandler);\r\n  }\r\n\r\n  onDragOver($event) {\r\n    if (!this.allowDrop($event)) {\r\n      if (this.allowDragoverStyling) {\r\n        return this.addDisabledClass();\r\n      }\r\n      return;\r\n    }\r\n\r\n    this.onDragOverCallback.emit({event: $event, element: this.treeDraggedElement.get()});\r\n\r\n    $event.preventDefault();\r\n    if (this.allowDragoverStyling) {\r\n      this.addClass();\r\n    }\r\n  }\r\n\r\n  onDragEnter($event) {\r\n    if (!this.allowDrop($event)) return;\r\n\r\n    $event.preventDefault();\r\n    this.onDragEnterCallback.emit({event: $event, element: this.treeDraggedElement.get()});\r\n  }\r\n\r\n  onDragLeave($event) {\r\n    if (!this.allowDrop($event)) {\r\n      if (this.allowDragoverStyling) {\r\n        return this.removeDisabledClass();\r\n      }\r\n      return;\r\n    }\r\n    this.onDragLeaveCallback.emit({event: $event, element: this.treeDraggedElement.get()});\r\n\r\n    if (this.allowDragoverStyling) {\r\n      this.removeClass();\r\n    }\r\n  }\r\n\r\n  @HostListener('drop', ['$event']) onDrop($event) {\r\n    if (!this.allowDrop($event)) return;\r\n\r\n    $event.preventDefault();\r\n    this.onDropCallback.emit({event: $event, element: this.treeDraggedElement.get()});\r\n\r\n    if (this.allowDragoverStyling) {\r\n      this.removeClass();\r\n    }\r\n    this.treeDraggedElement.set(null);\r\n  }\r\n\r\n  private addClass() {\r\n    this.renderer.addClass(this.el.nativeElement, DRAG_OVER_CLASS);\r\n  }\r\n\r\n  private removeClass() {\r\n    this.renderer.removeClass(this.el.nativeElement, DRAG_OVER_CLASS);\r\n  }\r\n\r\n  private addDisabledClass() {\r\n    this.renderer.addClass(this.el.nativeElement, DRAG_DISABLED_CLASS);\r\n  }\r\n\r\n  private removeDisabledClass() {\r\n    this.renderer.removeClass(this.el.nativeElement, DRAG_DISABLED_CLASS);\r\n  }\r\n}\r\n"]}