ng2-tree
Version:
angular2 component for visualizing data that can be naturally represented as a tree
118 lines • 16.8 kB
JavaScript
import { Directive, ElementRef, Inject, Input, Renderer2 } from '@angular/core';
import { NodeDraggableService } from './node-draggable.service';
import { CapturedNode } from './captured-node';
import * as i0 from "@angular/core";
import * as i1 from "./node-draggable.service";
export class NodeDraggableDirective {
element;
nodeDraggableService;
renderer;
static DATA_TRANSFER_STUB_DATA = 'some browsers enable drag-n-drop only when dataTransfer has data';
nodeDraggable;
tree;
nodeNativeElement;
disposersForDragListeners = [];
constructor(element, nodeDraggableService, renderer) {
this.element = element;
this.nodeDraggableService = nodeDraggableService;
this.renderer = renderer;
this.nodeNativeElement = element.nativeElement;
}
ngOnInit() {
if (!this.tree.isStatic()) {
this.renderer.setAttribute(this.nodeNativeElement, 'draggable', 'true');
this.disposersForDragListeners.push(this.renderer.listen(this.nodeNativeElement, 'dragenter', this.handleDragEnter.bind(this)));
this.disposersForDragListeners.push(this.renderer.listen(this.nodeNativeElement, 'dragover', this.handleDragOver.bind(this)));
this.disposersForDragListeners.push(this.renderer.listen(this.nodeNativeElement, 'dragstart', this.handleDragStart.bind(this)));
this.disposersForDragListeners.push(this.renderer.listen(this.nodeNativeElement, 'dragleave', this.handleDragLeave.bind(this)));
this.disposersForDragListeners.push(this.renderer.listen(this.nodeNativeElement, 'drop', this.handleDrop.bind(this)));
this.disposersForDragListeners.push(this.renderer.listen(this.nodeNativeElement, 'dragend', this.handleDragEnd.bind(this)));
}
}
ngOnDestroy() {
/* tslint:disable:typedef */
this.disposersForDragListeners.forEach(dispose => dispose());
/* tslint:enable:typedef */
}
handleDragStart(e) {
if (e.stopPropagation) {
e.stopPropagation();
}
this.nodeDraggableService.captureNode(new CapturedNode(this.nodeDraggable, this.tree));
e.dataTransfer.setData('text', NodeDraggableDirective.DATA_TRANSFER_STUB_DATA);
e.dataTransfer.effectAllowed = 'move';
}
handleDragOver(e) {
e.preventDefault();
e.dataTransfer.dropEffect = 'move';
}
handleDragEnter(e) {
e.preventDefault();
if (this.containsElementAt(e)) {
this.addClass('over-drop-target');
}
}
handleDragLeave(e) {
if (!this.containsElementAt(e)) {
this.removeClass('over-drop-target');
}
}
handleDrop(e) {
e.preventDefault();
if (e.stopPropagation) {
e.stopPropagation();
}
this.removeClass('over-drop-target');
if (!this.isDropPossible(e)) {
return false;
}
if (this.nodeDraggableService.getCapturedNode()) {
return this.notifyThatNodeWasDropped();
}
}
isDropPossible(e) {
const capturedNode = this.nodeDraggableService.getCapturedNode();
return capturedNode && capturedNode.canBeDroppedAt(this.nodeDraggable) && this.containsElementAt(e);
}
handleDragEnd(e) {
this.removeClass('over-drop-target');
this.nodeDraggableService.releaseCapturedNode();
}
containsElementAt(e) {
const { x = e.clientX, y = e.clientY } = e;
return this.nodeNativeElement.contains(document.elementFromPoint(x, y));
}
addClass(className) {
const classList = this.nodeNativeElement.classList;
classList.add(className);
}
removeClass(className) {
const classList = this.nodeNativeElement.classList;
classList.remove(className);
}
notifyThatNodeWasDropped() {
this.nodeDraggableService.fireNodeDragged(this.nodeDraggableService.getCapturedNode(), this.nodeDraggable);
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: NodeDraggableDirective, deps: [{ token: ElementRef }, { token: NodeDraggableService }, { token: Renderer2 }], target: i0.ɵɵFactoryTarget.Directive });
static ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.2.12", type: NodeDraggableDirective, selector: "[nodeDraggable]", inputs: { nodeDraggable: "nodeDraggable", tree: "tree" }, ngImport: i0 });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.2.12", ngImport: i0, type: NodeDraggableDirective, decorators: [{
type: Directive,
args: [{
selector: '[nodeDraggable]'
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef, decorators: [{
type: Inject,
args: [ElementRef]
}] }, { type: i1.NodeDraggableService, decorators: [{
type: Inject,
args: [NodeDraggableService]
}] }, { type: i0.Renderer2, decorators: [{
type: Inject,
args: [Renderer2]
}] }]; }, propDecorators: { nodeDraggable: [{
type: Input
}], tree: [{
type: Input
}] } });
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{ Directive, ElementRef, Inject, Input, OnDestroy, OnInit, Renderer2 } from '@angular/core';\nimport { NodeDraggableService } from './node-draggable.service';\nimport { CapturedNode } from './captured-node';\nimport { Tree } from '../tree';\n\n@Directive({\n  selector: '[nodeDraggable]'\n})\nexport class NodeDraggableDirective implements OnDestroy, OnInit {\n  public static DATA_TRANSFER_STUB_DATA = 'some browsers enable drag-n-drop only when dataTransfer has data';\n\n  @Input() public nodeDraggable: ElementRef;\n\n  @Input() public tree: Tree;\n\n  private nodeNativeElement: HTMLElement;\n  private disposersForDragListeners: (() => void)[] = [];\n\n  public constructor(\n    @Inject(ElementRef) public element: ElementRef,\n    @Inject(NodeDraggableService) private nodeDraggableService: NodeDraggableService,\n    @Inject(Renderer2) private renderer: Renderer2\n  ) {\n    this.nodeNativeElement = element.nativeElement;\n  }\n\n  public ngOnInit(): void {\n    if (!this.tree.isStatic()) {\n      this.renderer.setAttribute(this.nodeNativeElement, 'draggable', 'true');\n      this.disposersForDragListeners.push(\n        this.renderer.listen(this.nodeNativeElement, 'dragenter', this.handleDragEnter.bind(this))\n      );\n      this.disposersForDragListeners.push(\n        this.renderer.listen(this.nodeNativeElement, 'dragover', this.handleDragOver.bind(this))\n      );\n      this.disposersForDragListeners.push(\n        this.renderer.listen(this.nodeNativeElement, 'dragstart', this.handleDragStart.bind(this))\n      );\n      this.disposersForDragListeners.push(\n        this.renderer.listen(this.nodeNativeElement, 'dragleave', this.handleDragLeave.bind(this))\n      );\n      this.disposersForDragListeners.push(\n        this.renderer.listen(this.nodeNativeElement, 'drop', this.handleDrop.bind(this))\n      );\n      this.disposersForDragListeners.push(\n        this.renderer.listen(this.nodeNativeElement, 'dragend', this.handleDragEnd.bind(this))\n      );\n    }\n  }\n\n  public ngOnDestroy(): void {\n    /* tslint:disable:typedef */\n    this.disposersForDragListeners.forEach(dispose => dispose());\n    /* tslint:enable:typedef */\n  }\n\n  private handleDragStart(e: DragEvent): any {\n    if (e.stopPropagation) {\n      e.stopPropagation();\n    }\n\n    this.nodeDraggableService.captureNode(new CapturedNode(this.nodeDraggable, this.tree));\n\n    e.dataTransfer.setData('text', NodeDraggableDirective.DATA_TRANSFER_STUB_DATA);\n    e.dataTransfer.effectAllowed = 'move';\n  }\n\n  private handleDragOver(e: DragEvent): any {\n    e.preventDefault();\n    e.dataTransfer.dropEffect = 'move';\n  }\n\n  private handleDragEnter(e: DragEvent): any {\n    e.preventDefault();\n    if (this.containsElementAt(e)) {\n      this.addClass('over-drop-target');\n    }\n  }\n\n  private handleDragLeave(e: DragEvent): any {\n    if (!this.containsElementAt(e)) {\n      this.removeClass('over-drop-target');\n    }\n  }\n\n  private handleDrop(e: DragEvent): any {\n    e.preventDefault();\n    if (e.stopPropagation) {\n      e.stopPropagation();\n    }\n\n    this.removeClass('over-drop-target');\n\n    if (!this.isDropPossible(e)) {\n      return false;\n    }\n\n    if (this.nodeDraggableService.getCapturedNode()) {\n      return this.notifyThatNodeWasDropped();\n    }\n  }\n\n  private isDropPossible(e: DragEvent): boolean {\n    const capturedNode = this.nodeDraggableService.getCapturedNode();\n    return capturedNode && capturedNode.canBeDroppedAt(this.nodeDraggable) && this.containsElementAt(e);\n  }\n\n  private handleDragEnd(e: DragEvent): any {\n    this.removeClass('over-drop-target');\n    this.nodeDraggableService.releaseCapturedNode();\n  }\n\n  private containsElementAt(e: DragEvent): boolean {\n    const { x = e.clientX, y = e.clientY } = e;\n    return this.nodeNativeElement.contains(document.elementFromPoint(x, y));\n  }\n\n  private addClass(className: string): void {\n    const classList: DOMTokenList = this.nodeNativeElement.classList;\n    classList.add(className);\n  }\n\n  private removeClass(className: string): void {\n    const classList: DOMTokenList = this.nodeNativeElement.classList;\n    classList.remove(className);\n  }\n\n  private notifyThatNodeWasDropped(): void {\n    this.nodeDraggableService.fireNodeDragged(this.nodeDraggableService.getCapturedNode(), this.nodeDraggable);\n  }\n}\n"]}