import {NavController} from './nav-controller'; import {SlideEdgeGesture} from '../../gestures/slide-edge-gesture'; export class SwipeBackGesture extends SlideEdgeGesture { public edges: Array; public threshold: string; constructor( element: HTMLElement, opts: any = {}, private _nav: NavController ) { super(element, opts); // Can check corners through use of eg 'left top' this.edges = opts.edge.split(' '); this.threshold = opts.threshold; } onSlideStart() { this._nav.swipeBackStart(); } onSlide(slide, ev) { this._nav.swipeBackProgress(slide.distance / slide.max); } onSlideEnd(slide, ev) { let shouldComplete = (Math.abs(ev.velocityX) > 0.2 || Math.abs(slide.delta) > Math.abs(slide.max) * 0.5); // TODO: calculate a better playback rate depending on velocity and distance this._nav.swipeBackEnd(shouldComplete, 1); } }