angular-tree-component
Version:
A simple yet powerful tree component for Angular2
128 lines (127 loc) • 16.1 kB
JavaScript
import { Directive, ElementRef, EventEmitter, HostListener, Input, NgZone, Output, Renderer2 } from '@angular/core';
import { TreeDraggedElement } from '../models/tree-dragged-element.model';
var DRAG_OVER_CLASS = 'is-dragging-over';
var DRAG_DISABLED_CLASS = 'is-dragging-over-disabled';
var TreeDropDirective = /** @class */ (function () {
function TreeDropDirective(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 = function (element, $event) { return true; };
this.dragOverEventHandler = this.onDragOver.bind(this);
this.dragEnterEventHandler = this.onDragEnter.bind(this);
this.dragLeaveEventHandler = this.onDragLeave.bind(this);
}
Object.defineProperty(TreeDropDirective.prototype, "treeAllowDrop", {
set: function (allowDrop) {
if (allowDrop instanceof Function) {
this._allowDrop = allowDrop;
}
else
this._allowDrop = function (element, $event) { return allowDrop; };
},
enumerable: true,
configurable: true
});
TreeDropDirective.prototype.allowDrop = function ($event) {
return this._allowDrop(this.treeDraggedElement.get(), $event);
};
TreeDropDirective.prototype.ngAfterViewInit = function () {
var _this = this;
var el = this.el.nativeElement;
this.ngZone.runOutsideAngular(function () {
el.addEventListener('dragover', _this.dragOverEventHandler);
el.addEventListener('dragenter', _this.dragEnterEventHandler);
el.addEventListener('dragleave', _this.dragLeaveEventHandler);
});
};
TreeDropDirective.prototype.ngOnDestroy = function () {
var el = this.el.nativeElement;
el.removeEventListener('dragover', this.dragOverEventHandler);
el.removeEventListener('dragenter', this.dragEnterEventHandler);
el.removeEventListener('dragleave', this.dragLeaveEventHandler);
};
TreeDropDirective.prototype.onDragOver = function ($event) {
if (!this.allowDrop($event)) {
if (this.allowDragoverStyling) {
return this.addDisabledClass();
}
return;
}
;
this.onDragOverCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
$event.preventDefault();
if (this.allowDragoverStyling) {
this.addClass();
}
};
TreeDropDirective.prototype.onDragEnter = function ($event) {
if (!this.allowDrop($event))
return;
this.onDragEnterCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
};
TreeDropDirective.prototype.onDragLeave = function ($event) {
if (!this.allowDrop($event)) {
if (this.allowDragoverStyling) {
return this.removeDisabledClass();
}
return;
}
this.onDragLeaveCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
if (this.allowDragoverStyling) {
this.removeClass();
}
};
TreeDropDirective.prototype.onDrop = function ($event) {
if (!this.allowDrop($event))
return;
$event.preventDefault();
this.onDropCallback.emit({ event: $event, element: this.treeDraggedElement.get() });
if (this.allowDragoverStyling) {
this.removeClass();
}
this.treeDraggedElement.set(null);
};
TreeDropDirective.prototype.addClass = function () {
this.renderer.addClass(this.el.nativeElement, DRAG_OVER_CLASS);
};
TreeDropDirective.prototype.removeClass = function () {
this.renderer.removeClass(this.el.nativeElement, DRAG_OVER_CLASS);
};
TreeDropDirective.prototype.addDisabledClass = function () {
this.renderer.addClass(this.el.nativeElement, DRAG_DISABLED_CLASS);
};
TreeDropDirective.prototype.removeDisabledClass = function () {
this.renderer.removeClass(this.el.nativeElement, DRAG_DISABLED_CLASS);
};
TreeDropDirective.decorators = [
{ type: Directive, args: [{
selector: '[treeDrop]'
},] },
];
/** @nocollapse */
TreeDropDirective.ctorParameters = function () { return [
{ type: ElementRef },
{ type: Renderer2 },
{ type: TreeDraggedElement },
{ type: NgZone }
]; };
TreeDropDirective.propDecorators = {
allowDragoverStyling: [{ type: Input }],
onDropCallback: [{ type: Output, args: ['treeDrop',] }],
onDragOverCallback: [{ type: Output, args: ['treeDropDragOver',] }],
onDragLeaveCallback: [{ type: Output, args: ['treeDropDragLeave',] }],
onDragEnterCallback: [{ type: Output, args: ['treeDropDragEnter',] }],
treeAllowDrop: [{ type: Input }],
onDrop: [{ type: HostListener, args: ['drop', ['$event'],] }]
};
return TreeDropDirective;
}());
export { TreeDropDirective };
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{\n  AfterViewInit,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  HostListener,\n  Input,\n  NgZone,\n  OnDestroy,\n  Output,\n  Renderer2\n} from '@angular/core';\nimport { TreeDraggedElement } from '../models/tree-dragged-element.model';\n\nconst DRAG_OVER_CLASS = 'is-dragging-over';\nconst DRAG_DISABLED_CLASS = 'is-dragging-over-disabled';\n\n@Directive({\n  selector: '[treeDrop]'\n})\nexport class TreeDropDirective implements AfterViewInit, OnDestroy {\n  @Input() allowDragoverStyling = true;\n  @Output('treeDrop') onDropCallback = new EventEmitter();\n  @Output('treeDropDragOver') onDragOverCallback = new EventEmitter();\n  @Output('treeDropDragLeave') onDragLeaveCallback = new EventEmitter();\n  @Output('treeDropDragEnter') onDragEnterCallback = new EventEmitter();\n  private readonly dragOverEventHandler: (ev: DragEvent) => void;\n  private readonly dragEnterEventHandler: (ev: DragEvent) => void;\n  private readonly dragLeaveEventHandler: (ev: DragEvent) => void;\n\n  private _allowDrop = (element, $event) => true;\n\n  @Input() set treeAllowDrop(allowDrop) {\n    if (allowDrop instanceof Function) {\n      this._allowDrop = allowDrop;\n    }\n    else this._allowDrop = (element, $event) => allowDrop;\n  }\n\n  allowDrop($event) {\n    return this._allowDrop(this.treeDraggedElement.get(), $event);\n  }\n\n  constructor(private el: ElementRef, private renderer: Renderer2, private treeDraggedElement: TreeDraggedElement, private ngZone: NgZone) {\n    this.dragOverEventHandler = this.onDragOver.bind(this);\n    this.dragEnterEventHandler = this.onDragEnter.bind(this);\n    this.dragLeaveEventHandler = this.onDragLeave.bind(this);\n  }\n\n  ngAfterViewInit() {\n    let el: HTMLElement = this.el.nativeElement;\n    this.ngZone.runOutsideAngular(() => {\n      el.addEventListener('dragover', this.dragOverEventHandler);\n      el.addEventListener('dragenter', this.dragEnterEventHandler);\n      el.addEventListener('dragleave', this.dragLeaveEventHandler);\n    });\n  }\n\n  ngOnDestroy() {\n    let el: HTMLElement = this.el.nativeElement;\n    el.removeEventListener('dragover', this.dragOverEventHandler);\n    el.removeEventListener('dragenter', this.dragEnterEventHandler);\n    el.removeEventListener('dragleave', this.dragLeaveEventHandler);\n  }\n\n  onDragOver($event) {\n    if (!this.allowDrop($event)) {\n      if (this.allowDragoverStyling) {\n        return this.addDisabledClass();\n      }\n      return;\n    };\n\n    this.onDragOverCallback.emit({event: $event, element: this.treeDraggedElement.get()});\n\n    $event.preventDefault();\n    if (this.allowDragoverStyling) {\n      this.addClass();\n    }\n  }\n\n  onDragEnter($event) {\n    if (!this.allowDrop($event)) return;\n\n    this.onDragEnterCallback.emit({event: $event, element: this.treeDraggedElement.get()});\n  }\n\n  onDragLeave($event) {\n    if (!this.allowDrop($event)) {\n      if (this.allowDragoverStyling) {\n        return this.removeDisabledClass();\n      }\n      return;\n    }\n    this.onDragLeaveCallback.emit({event: $event, element: this.treeDraggedElement.get()});\n\n    if (this.allowDragoverStyling) {\n      this.removeClass();\n    }\n  }\n\n  @HostListener('drop', ['$event']) onDrop($event) {\n    if (!this.allowDrop($event)) return;\n\n    $event.preventDefault();\n    this.onDropCallback.emit({event: $event, element: this.treeDraggedElement.get()});\n\n    if (this.allowDragoverStyling) {\n      this.removeClass();\n    }\n    this.treeDraggedElement.set(null);\n  }\n\n  private addClass() {\n    this.renderer.addClass(this.el.nativeElement, DRAG_OVER_CLASS);\n  }\n\n  private removeClass() {\n    this.renderer.removeClass(this.el.nativeElement, DRAG_OVER_CLASS);\n  }\n\n  private addDisabledClass() {\n    this.renderer.addClass(this.el.nativeElement, DRAG_DISABLED_CLASS);\n  }\n\n  private removeDisabledClass() {\n    this.renderer.removeClass(this.el.nativeElement, DRAG_DISABLED_CLASS);\n  }\n}\n"]}