const MIN_DISTANCE = 10
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function getDirection(x, y) {
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if (x > y && x > MIN_DISTANCE) {
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return 'horizontal'
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}
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if (y > x && y > MIN_DISTANCE) {
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return 'vertical'
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}
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return ''
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}
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export default {
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methods: {
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touchStart(e) {
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this.resetTouchStatus()
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const touch = this.getTouchPoint(e)
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this.startX = touch.x
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this.startY = touch.y
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},
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touchMove(e) {
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const touch = this.getTouchPoint(e)
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this.deltaX = touch.x - this.startX
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this.deltaY = touch.y - this.startY
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this.offsetX = Math.abs(this.deltaX)
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this.offsetY = Math.abs(this.deltaY)
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this.direction = this.direction || getDirection(this.offsetX, this.offsetY)
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},
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getTouchPoint(e) {
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if (!e) {
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return {
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x: 0,
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y: 0
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}
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}
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if (e.touches && e.touches[0]) {
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return {
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x: e.touches[0].pageX,
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y: e.touches[0].pageY
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}
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}
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if (e.changedTouches && e.changedTouches[0]) {
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return {
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x: e.changedTouches[0].pageX,
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y: e.changedTouches[0].pageY
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}
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}
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return {
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x: e.clientX || 0,
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y: e.clientY || 0
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}
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},
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resetTouchStatus() {
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this.direction = ''
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this.deltaX = 0
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this.deltaY = 0
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this.offsetX = 0
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this.offsetY = 0
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}
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}
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}
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