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| import _ from 'lodash';
import React from 'react';
import PropTypes from 'prop-types';
import { lucidClassNames } from '../../util/style-helpers';
import { createClass, omitProps } from '../../util/component-types';
const cx = lucidClassNames.bind('&-DragCaptureZone');
const { func, string } = PropTypes;
/**
* {"categories": ["utility"]}
*
* This is a helper component used to capture mouse events to determine when the
* user starts, is and stops dragging.
*/
const DragCaptureZone = createClass({
displayName: 'DragCaptureZone',
propTypes: {
/**
* Appended to the component-specific class names set on the root
* element.
*/
className: string,
/**
* Called as the user drags the mouse.
*
* Signature: `({ dx, dy, pageX, pageY }, { event, props }) => {}`
*/
onDrag: func,
/**
* Called when the user releases the mouse button after having dragged.
*
* Signature: `({ dx, dy, pageX, pageY }, { event, props }) => {}`
*/
onDragEnd: func,
/**
* Called when the user presses the mouse button down while over the
* component.
*
* Signature: `({ dx, dy, pageX, pageY }, { event, props }) => {}`
*/
onDragStart: func,
/**
* Called when the drag event is canceled due to user interaction.
* For example: if a system alert pops up during a touch event.
*
* Signature: `({ event, props }) => {}`
*/
onDragCancel: func,
},
getDefaultProps() {
return {
onDrag: _.noop,
onDragEnd: _.noop,
onDragStart: _.noop,
onDragCancel: _.noop,
};
},
getInitialState() {
return {
pageX: 0,
pageY: 0,
};
},
render() {
return (
<div
{...omitProps(this.props, DragCaptureZone)}
className={cx('&', this.props.className)}
key="DragCaptureZone"
onMouseDown={this.handleDragStart}
ref={ref => {
this.elementRef = ref;
}}
/>
);
},
componentDidMount() {
//add event listeners directly on the DOM element to allow preventDefault
//calls which are not honored due to react's event delegation
//reference: https://github.com/facebook/react/issues/8968
this.elementRef.addEventListener('touchstart', this.handleDragStart);
this.elementRef.addEventListener('touchmove', this.handleDrag);
this.elementRef.addEventListener('touchend', this.handleDragEnd);
this.elementRef.addEventListener('touchcancel', this.handleDragCancel);
},
componentWillUnmount() {
this.elementRef.removeEventListener('touchstart', this.handleDragStart);
this.elementRef.removeEventListener('touchmove', this.handleDrag);
this.elementRef.removeEventListener('touchend', this.handleDragEnd);
this.elementRef.removeEventListener('touchcancel', this.handleDragCancel);
window.document.removeEventListener('mousemove', this.handleDrag);
window.document.removeEventListener('mouseup', this.handleDragEnd);
},
handleDrag(event) {
let pageX;
let pageY;
/* istanbul ignore next */
if (event.touches) {
pageX = event.touches[0].pageX;
pageY = event.touches[0].pageY;
} else {
pageX = event.pageX;
pageY = event.pageY;
}
event.preventDefault();
this.props.onDrag(
{
dX: pageX - this.state.pageX,
dY: pageY - this.state.pageY,
pageX,
pageY,
},
{
event,
props: this.props,
}
);
},
handleDragEnd(event) {
let pageX;
let pageY;
/* istanbul ignore next */
if (event.changedTouches) {
pageX = event.changedTouches[0].pageX;
pageY = event.changedTouches[0].pageY;
} else {
pageX = event.pageX;
pageY = event.pageY;
window.document.removeEventListener('mousemove', this.handleDrag);
window.document.removeEventListener('mouseup', this.handleDragEnd);
}
event.preventDefault();
this.props.onDragEnd(
{
dX: pageX - this.state.pageX,
dY: pageY - this.state.pageY,
pageX,
pageY,
},
{
event,
props: this.props,
}
);
this.setState({
pageX: 0,
pageY: 0,
});
},
handleDragStart(event) {
let pageX;
let pageY;
/* istanbul ignore next */
if (event.touches) {
pageX = event.touches[0].pageX;
pageY = event.touches[0].pageY;
} else {
pageX = event.pageX;
pageY = event.pageY;
window.document.addEventListener('mousemove', this.handleDrag);
window.document.addEventListener('mouseup', this.handleDragEnd);
}
event.preventDefault();
this.props.onDragStart(
{
dX: 0,
dY: 0,
pageX,
pageY,
},
{
event,
props: this.props,
}
);
this.setState({
pageX,
pageY,
});
},
handleDragCancel(event) {
this.props.onDragCancel({
event,
props: this.props,
});
this.setState({
pageX: 0,
pageY: 0,
});
},
});
export default DragCaptureZone;
|