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DragScroll.jsx
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DragScroll.jsx
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/**
* Created by joe on 16/9/2.
*/
import React from "react";
export default class DragScroll extends React.Component {
constructor(props) {
super(props);
this.state = {
data: props.dataSource,
dragging: false
};
}
render() {
let sytle = null;
if (this.props.height && this.props.width) {
sytle = {style: {height: this.props.height, width: this.props.width, overflow: 'auto'}};
}
return <div className={this.props.className} {...sytle}
onMouseUp={this.mouseUpHandle.bind(this)}
onMouseMove={this.mouseMoveHandle.bind(this)}
ref="container">
{this.props.children && this.renderChildren(this.props.children)}
</div>;
}
componentDidMount() {
window.addEventListener('mouseup', this.mouseUpHandle.bind(this));
window.addEventListener('mousemove', this.mouseMoveHandle.bind(this));
}
componentWillUnmount() {
window.removeEventListener('mouseup', this.mouseUpHandle.bind(this));
window.removeEventListener('mousemove', this.mouseMoveHandle.bind(this));
}
mouseUpHandle(e) {
if (this.state.dragging) {
this.state.dragging = false;
this.setState(this.state);
}
}
mouseDownHandle(e) {
if (!this.state.dragging) {
this.state.dragging = true;
this.setState(this.state);
this.lastClientX = e.clientX;
this.lastClientY = e.clientY;
e.preventDefault();
}
}
mouseMoveHandle(e) {
if (this.state.dragging) {
this.refs.container.scrollLeft -=
(-this.lastClientX + (this.lastClientX = e.clientX));
this.refs.container.scrollTop -=
(-this.lastClientY + (this.lastClientY = e.clientY));
}
}
renderChildren(dom, type) {
if (this.isArray(dom)) {
return dom.map((item, index) => {
return React.cloneElement(item, {
key: item.key || index,
onMouseUp: this.mouseUpHandle.bind(this),
onMouseDown: this.mouseDownHandle.bind(this)
});
});
} else if ('object' == typeof dom) {
return React.cloneElement(dom, {
onMouseUp: this.mouseUpHandle.bind(this),
onMouseDown: this.mouseDownHandle.bind(this)
});
}
}
isArray(object){
return object && typeof object==='object' &&
typeof object.length==='number' &&
typeof object.splice==='function' &&
//判断length属性是否是可枚举的 对于数组 将得到false
!(object.propertyIsEnumerable('length'));
}
}