h5-elab-open-ownerUnion/wxcomponents/vant/mixins/touch.js

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);
        }
    }
});