greenPro/unpackage/dist/dev/mp-weixin/wxcomponents/vant/mixins/touch.js

36 lines
1.0 KiB
JavaScript

const MIN_DISTANCE = 10;
function getDirection(x, y) {
if (x > y && x > MIN_DISTANCE) {
return 'horizontal';
}
if (y > x && y > MIN_DISTANCE) {
return 'vertical';
}
return '';
}
export const touch = Behavior({
methods: {
resetTouchStatus() {
this.direction = '';
this.deltaX = 0;
this.deltaY = 0;
this.offsetX = 0;
this.offsetY = 0;
},
touchStart(event) {
this.resetTouchStatus();
const touch = event.touches[0];
this.startX = touch.clientX;
this.startY = touch.clientY;
},
touchMove(event) {
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);
}
}
});