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Allow mobile users to drag slider components #107

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Allow mobile users to drag slider components #107

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34 changes: 33 additions & 1 deletion static/js/st/components/slider.jsx
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,8 @@ export default class Slider extends React.PureComponent {
let startValue = this.currentValue()

let moveListener = (e) => {
let x = e.pageX, y = e.pageX
let x = e.pageX
let y = e.pageY
let dx = x - startX

let newValue = dx / width * (this.props.max - this.props.min) + startValue
Expand All @@ -65,6 +66,36 @@ export default class Slider extends React.PureComponent {
document.body.addEventListener("mouseup", upListener)
}

startTouchDrag(startX, startY) {
if (this.props.disabled) {
return true;
}

let width = this.refs.track.clientWidth
let startValue = this.currentValue()

let moveListener = (e) => {
let x = e.changedTouches[0].pageX
let y = e.changedTouches[0].pageY
let dx = x - startX

let newValue = dx / width * (this.props.max - this.props.min) + startValue
newValue = Math.min(this.props.max, Math.max(this.props.min, newValue))

if (newValue != this.currentValue()) {
this.onChange(newValue)
}
}

let upListener = (e) => {
document.body.removeEventListener("touchmove", moveListener)
document.body.removeEventListener("touchend", upListener)
}

document.body.addEventListener("touchmove", moveListener)
document.body.addEventListener("touchend", upListener)
}

currentValue() {
if ("value" in this.state) {
return this.state.value
Expand Down Expand Up @@ -102,6 +133,7 @@ export default class Slider extends React.PureComponent {
<button
ref="sliderNub"
onMouseDown={(e) => this.startDrag(e.pageX, e.pageY)}
onTouchStart={(e) => this.startTouchDrag(e.changedTouches[0].pageX, e.changedTouches[0].pageY)}
onKeyDown={e => {
let delta = 0

Expand Down