@blackbaud/angular-tree-component
Version:
A simple yet powerful tree component for Angular 14+
127 lines • 16.4 kB
JavaScript
import { Directive, EventEmitter, HostListener, Input, Output } from '@angular/core';
import * as i0 from "@angular/core";
import * as i1 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: $event, element: this.treeDraggedElement.get() });
if (this.allowDragoverStyling) {
this.removeClass();
}
this.treeDraggedElement.set(null);
}
addClass() {
this.renderer.addClass(this.el.nativeElement, DRAG_OVER_CLASS);
}
removeClass() {
this.renderer.removeClass(this.el.nativeElement, DRAG_OVER_CLASS);
}
addDisabledClass() {
this.renderer.addClass(this.el.nativeElement, DRAG_DISABLED_CLASS);
}
removeDisabledClass() {
this.renderer.removeClass(this.el.nativeElement, DRAG_DISABLED_CLASS);
}
}
/** @nocollapse */ TreeDropDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: TreeDropDirective, deps: [{ token: i0.ElementRef }, { token: i0.Renderer2 }, { token: i1.TreeDraggedElement }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive });
/** @nocollapse */ TreeDropDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.3.0", type: TreeDropDirective, selector: "[treeDrop]", inputs: { allowDragoverStyling: "allowDragoverStyling", treeAllowDrop: "treeAllowDrop" }, outputs: { onDropCallback: "treeDrop", onDragOverCallback: "treeDropDragOver", onDragLeaveCallback: "treeDropDragLeave", onDragEnterCallback: "treeDropDragEnter" }, host: { listeners: { "drop": "onDrop($event)" } }, ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.3.0", ngImport: i0, type: TreeDropDirective, decorators: [{
type: Directive,
args: [{
selector: '[treeDrop]'
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.Renderer2 }, { type: i1.TreeDraggedElement }, { type: i0.NgZone }]; }, 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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{\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    $event.preventDefault();\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"]}