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Summary.js
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Summary.js
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import React, { Component, PropTypes } from 'react';
class Summary extends Component {
render() {
const sum = this.props.sum;
return (
<div>Total Count: {sum}</div>
);
}
}
Summary.propTypes = {
sum: PropTypes.number.isRequired
};
class SummaryContainer extends Component {
constructor(props, context) {
super(props, context);
this.onChange = this.onChange.bind(this);
this.state = this.getOwnState();
}
onChange() {
this.setState(this.getOwnState());
}
getOwnState() {
const state = this.context.store.getState();
let sum = 0;
for (const key in state) {
if (state.hasOwnProperty(key)) {
sum += state[key];
}
}
return { sum: sum };
}
shouldComponentUpdate(nextProps, nextState) {
return nextState.sum !== this.state.sum;
}
componentDidMount() {
this.context.store.subscribe(this.onChange);
}
componentWillUnmount() {
this.context.store.unsubscribe(this.onChange);
}
render() {
const sum = this.state.sum;
return (
<Summary sum={sum} />
);
}
}
SummaryContainer.contextTypes = {
store: PropTypes.object
}
export default SummaryContainer;