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| import _ from 'lodash';
import React from 'react';
import { lucidClassNames } from '../../util/style-helpers';
import { createClass } from '../../util/component-types';
const cx = lucidClassNames.bind('&-DragCaptureZone');
const {
func,
string,
} = React.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,
},
getDefaultProps() {
return {
onDrag: _.noop,
onDragEnd: _.noop,
onDragStart: _.noop,
};
},
getInitialState() {
return {
pageX: 0,
pageY: 0,
};
},
render() {
return (
<div
{...this.props}
className={cx('&', this.props.className)}
key='DragCaptureZone'
onMouseDown={this.handleDragStart}
/>
);
},
componentWillUnmount() {
window.document.removeEventListener('mousemove', this.handleDrag);
window.document.removeEventListener('mouseup', this.handleDragEnd);
},
handleDrag(event) {
const {
pageX,
pageY,
} = event;
event.preventDefault();
this.props.onDrag({
dX: pageX - this.state.pageX,
dY: pageY - this.state.pageY,
pageX,
pageY,
}, {
event,
props: this.props,
});
},
handleDragEnd(event) {
const {
pageX,
pageY,
} = event;
event.preventDefault();
window.document.removeEventListener('mousemove', this.handleDrag);
window.document.removeEventListener('mouseup', this.handleDragEnd);
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) {
const {
pageX,
pageY,
} = event;
event.preventDefault();
window.document.addEventListener('mousemove', this.handleDrag);
window.document.addEventListener('mouseup', this.handleDragEnd);
this.props.onDragStart({
dX: 0,
dY: 0,
pageX,
pageY,
}, {
event,
props: this.props,
});
this.setState({
pageX,
pageY,
});
},
});
export default DragCaptureZone;
|