import Vue from 'vue'; export const isServer=false; const MIN_DISTANCE = 10; const TouchMixinData = { startX: Number, startY: Number, deltaX: Number, deltaY: Number, offsetX: Number, offsetY: Number, direction: String }; function getDirection(x,y) { if (x > y && x > MIN_DISTANCE) { return 'horizontal'; } if (y > x && y > MIN_DISTANCE) { return 'vertical'; } return ''; } export let supportsPassive = false; export function on( target, event, handler, passive = false ) { if (!isServer) { target.addEventListener( event, handler, supportsPassive ? { capture: false, passive } : false ); } } export const TouchMixin = Vue.extend({ data() {TouchMixinData return { direction: '' } ; }, methods: { touchStart() { this.resetTouchStatus(); this.startX = event.touches[0].clientX; this.startY = event.touches[0].clientY; }, touchMove() { const touch = event.touches[0]; this.deltaX = touch.clientX - this.startX; this.deltaY = touch.clientY - this.startY; this.offsetX = Math.abs(this.deltaX); this.offsetY = Math.abs(this.deltaY); this.direction = this.direction || getDirection(this.offsetX, this.offsetY); }, resetTouchStatus() { this.direction = ''; this.deltaX = 0; this.deltaY = 0; this.offsetX = 0; this.offsetY = 0; }, // avoid Vue 2.6 event bubble issues by manually binding events // https://github.com/youzan/vant/issues/3015 bindTouchEvent( el ) { const { onTouchStart, onTouchMove, onTouchEnd } = this; on(el, 'touchstart', onTouchStart); on(el, 'touchmove', onTouchMove); if (onTouchEnd) { on(el, 'touchend', onTouchEnd); on(el, 'touchcancel', onTouchEnd); } }, }, });
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