@swimlane/ngx-datatable
Version:
ngx-datatable is an Angular table grid component for presenting large and complex data.
102 lines • 11.9 kB
JavaScript
import { Directive, ElementRef, Input, Output, EventEmitter } from '@angular/core';
import { fromEvent } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
/**
* Draggable Directive for Angular2
*
* Inspiration:
* https://github.com/AngularClass/angular2-examples/blob/master/rx-draggable/directives/draggable.ts
* http://stackoverflow.com/questions/35662530/how-to-implement-drag-and-drop-in-angular2
*
*/
export class DraggableDirective {
constructor(element) {
this.dragX = true;
this.dragY = true;
this.dragStart = new EventEmitter();
this.dragging = new EventEmitter();
this.dragEnd = new EventEmitter();
this.isDragging = false;
this.element = element.nativeElement;
}
ngOnChanges(changes) {
if (changes['dragEventTarget'] && changes['dragEventTarget'].currentValue && this.dragModel.dragging) {
this.onMousedown(changes['dragEventTarget'].currentValue);
}
}
ngOnDestroy() {
this._destroySubscription();
}
onMouseup(event) {
if (!this.isDragging)
return;
this.isDragging = false;
this.element.classList.remove('dragging');
if (this.subscription) {
this._destroySubscription();
this.dragEnd.emit({
event,
element: this.element,
model: this.dragModel
});
}
}
onMousedown(event) {
// we only want to drag the inner header text
const isDragElm = event.target.classList.contains('draggable');
if (isDragElm && (this.dragX || this.dragY)) {
event.preventDefault();
this.isDragging = true;
const mouseDownPos = { x: event.clientX, y: event.clientY };
const mouseup = fromEvent(document, 'mouseup');
this.subscription = mouseup.subscribe((ev) => this.onMouseup(ev));
const mouseMoveSub = fromEvent(document, 'mousemove')
.pipe(takeUntil(mouseup))
.subscribe((ev) => this.move(ev, mouseDownPos));
this.subscription.add(mouseMoveSub);
this.dragStart.emit({
event,
element: this.element,
model: this.dragModel
});
}
}
move(event, mouseDownPos) {
if (!this.isDragging)
return;
const x = event.clientX - mouseDownPos.x;
const y = event.clientY - mouseDownPos.y;
if (this.dragX)
this.element.style.left = `${x}px`;
if (this.dragY)
this.element.style.top = `${y}px`;
this.element.classList.add('dragging');
this.dragging.emit({
event,
element: this.element,
model: this.dragModel
});
}
_destroySubscription() {
if (this.subscription) {
this.subscription.unsubscribe();
this.subscription = undefined;
}
}
}
DraggableDirective.decorators = [
{ type: Directive, args: [{ selector: '[draggable]' },] }
];
DraggableDirective.ctorParameters = () => [
{ type: ElementRef }
];
DraggableDirective.propDecorators = {
dragEventTarget: [{ type: Input }],
dragModel: [{ type: Input }],
dragX: [{ type: Input }],
dragY: [{ type: Input }],
dragStart: [{ type: Output }],
dragging: [{ type: Output }],
dragEnd: [{ type: Output }]
};
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{ Directive, ElementRef, Input, Output, EventEmitter, OnDestroy, OnChanges, SimpleChanges } from '@angular/core';\nimport { Subscription, fromEvent } from 'rxjs';\nimport { takeUntil } from 'rxjs/operators';\n\n/**\n * Draggable Directive for Angular2\n *\n * Inspiration:\n *   https://github.com/AngularClass/angular2-examples/blob/master/rx-draggable/directives/draggable.ts\n *   http://stackoverflow.com/questions/35662530/how-to-implement-drag-and-drop-in-angular2\n *\n */\n@Directive({ selector: '[draggable]' })\nexport class DraggableDirective implements OnDestroy, OnChanges {\n  @Input() dragEventTarget: any;\n  @Input() dragModel: any;\n  @Input() dragX: boolean = true;\n  @Input() dragY: boolean = true;\n\n  @Output() dragStart: EventEmitter<any> = new EventEmitter();\n  @Output() dragging: EventEmitter<any> = new EventEmitter();\n  @Output() dragEnd: EventEmitter<any> = new EventEmitter();\n\n  element: HTMLElement;\n  isDragging: boolean = false;\n  subscription: Subscription;\n\n  constructor(element: ElementRef) {\n    this.element = element.nativeElement;\n  }\n\n  ngOnChanges(changes: SimpleChanges): void {\n    if (changes['dragEventTarget'] && changes['dragEventTarget'].currentValue && this.dragModel.dragging) {\n      this.onMousedown(changes['dragEventTarget'].currentValue);\n    }\n  }\n\n  ngOnDestroy(): void {\n    this._destroySubscription();\n  }\n\n  onMouseup(event: MouseEvent): void {\n    if (!this.isDragging) return;\n\n    this.isDragging = false;\n    this.element.classList.remove('dragging');\n\n    if (this.subscription) {\n      this._destroySubscription();\n      this.dragEnd.emit({\n        event,\n        element: this.element,\n        model: this.dragModel\n      });\n    }\n  }\n\n  onMousedown(event: MouseEvent): void {\n    // we only want to drag the inner header text\n    const isDragElm = (<HTMLElement>event.target).classList.contains('draggable');\n\n    if (isDragElm && (this.dragX || this.dragY)) {\n      event.preventDefault();\n      this.isDragging = true;\n\n      const mouseDownPos = { x: event.clientX, y: event.clientY };\n\n      const mouseup = fromEvent(document, 'mouseup');\n      this.subscription = mouseup.subscribe((ev: MouseEvent) => this.onMouseup(ev));\n\n      const mouseMoveSub = fromEvent(document, 'mousemove')\n        .pipe(takeUntil(mouseup))\n        .subscribe((ev: MouseEvent) => this.move(ev, mouseDownPos));\n\n      this.subscription.add(mouseMoveSub);\n\n      this.dragStart.emit({\n        event,\n        element: this.element,\n        model: this.dragModel\n      });\n    }\n  }\n\n  move(event: MouseEvent, mouseDownPos: { x: number; y: number }): void {\n    if (!this.isDragging) return;\n\n    const x = event.clientX - mouseDownPos.x;\n    const y = event.clientY - mouseDownPos.y;\n\n    if (this.dragX) this.element.style.left = `${x}px`;\n    if (this.dragY) this.element.style.top = `${y}px`;\n\n    this.element.classList.add('dragging');\n\n    this.dragging.emit({\n      event,\n      element: this.element,\n      model: this.dragModel\n    });\n  }\n\n  private _destroySubscription(): void {\n    if (this.subscription) {\n      this.subscription.unsubscribe();\n      this.subscription = undefined;\n    }\n  }\n}\n"]}