/**
* @file 可访问`ei`上下文的组件
* @author Leon(leon@outlook.com)
* @requires react
*/
var React = require('react');
/**
* `ei`上下文连接组件
*
* 凡是在`ContextProvider`中的组件都可以通过被此组件包裹后，获得到对`ei`上下文的访问功能
*
* @constructor
*/
var ContextConnector = React.createClass({
displayName: 'ContextConnector',
contextTypes: {
ei: React.PropTypes.object.isRequired
},
propTypes: {
children: React.PropTypes.func.isRequired,
select: React.PropTypes.func.isRequired
},
getDataFromContext: function () {
return this.props.select(this.context.ei.store);
},
getInitialState: function () {
return {
data: this.getDataFromContext()
};
},
componentDidMount: function () {
this.context.ei.addChangeListener(this.onStoreChange);
},
componentWillUnmount: function () {
this.context.ei.removeChangeListener(this.onStoreChange);
},
shouldComponentUpdate: function (nextProps, nextState) {
return this.state.data !== nextState;
},
onStoreChange: function () {
this.setState({
data: this.getDataFromContext()
});
},
render: function () {
return this.props.children(this.state.data, this.context.ei.dispatch);
}
});
module.exports = ContextConnector;