novo-elements/src/elements/dragula/Dragula.ts

Bullhorn's NOVO Element Repository for Angular 2

// NG2
import { Directive, ElementRef, OnInit, Input, OnChanges } from '@angular/core';
// Vendor
import * as dragula from 'dragula';
// APP
import { NovoDragulaService } from './DragulaService';

@Directive({
    selector: '[dragula]'
})
export class NovoDragulaElement implements OnInit, OnChanges {
    @Input('dragula') bag: any;
    @Input() dragulaModel: any;
    drake: any = null;
    container: any;

    constructor(element: ElementRef, private dragulaService: NovoDragulaService) {
        this.container = element.nativeElement;
    }

    ngOnInit() {
        let bag = this.dragulaService.find(this.bag);

        if (bag) {
            this.drake = bag.drake;
            this.checkModel();
            this.drake.containers.push(this.container);
        } else {
            this.drake = dragula({
                containers: [this.container]
            });
            this.checkModel();
            this.dragulaService.add(this.bag, this.drake);
        }
    }

    checkModel() {
        if (this.dragulaModel) {
            if (this.drake.models) {
                this.drake.models.push(this.dragulaModel);
            } else {
                this.drake.models = [this.dragulaModel];
            }
        }
    }

    ngOnChanges(changes) {
        if (changes && changes.dragulaModel) {
            if (this.drake) {
                if (this.drake.models) {
                    let modelIndex = this.drake.models.indexOf(changes.dragulaModel.previousValue);
                    this.drake.models.splice(modelIndex, 1, changes.dragulaModel.currentValue);
                } else {
                    this.drake.models = [changes.dragulaModel.currentValue];
                }
            }
        }
    }
}