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import React, {PropTypes} from 'react';
import ReactDom from 'react-dom';
import classnames from 'classnames';
const scrollTo = (element, to, duration) => {
// jump to target if duration zero
if (duration <= 0) {
element.scrollTop = to;
return;
}
const difference = to - element.scrollTop;
const perTick = difference / duration * 10;
setTimeout(() => {
element.scrollTop = element.scrollTop + perTick;
if (element.scrollTop === to) return;
scrollTo(element, to, duration - 10);
}, 10);
};
const Select = React.createClass({
propTypes: {
prefixCls: PropTypes.string,
options: PropTypes.array,
selectedIndex: PropTypes.number,
type: PropTypes.string,
onSelect: PropTypes.func,
},
componentDidMount() {
// jump to selected option
this.scrollToSelected(0);
},
componentDidUpdate() {
// smooth scroll to selected option
this.scrollToSelected(200);
},
onSelect(event) {
// do nothing when select selected option
if (event.target.getAttribute('class') === 'selected') {
return;
}
// change combobox selection
const { onSelect, type } = this.props;
const value = parseInt(event.target.innerHTML, 10);
onSelect(type, value);
},
getOptions() {
const { options, selectedIndex } = this.props;
return options.map((item, index) => {
const cls = classnames({ selected: selectedIndex === index});
const ref = selectedIndex === index ? 'selected' : null;
return <li ref={ref} className={cls} key={index} onClick={this.onSelect}>{item}</li>;
});
},
scrollToSelected(duration) {
// move to selected item
const select = ReactDom.findDOMNode(this);
const list = ReactDom.findDOMNode(this.refs.list);
let index = this.props.selectedIndex - 2;
if (index < 0) {
index = 0;
}
const topOption = list.children[index];
const to = topOption.offsetTop - select.offsetTop;
scrollTo(select, to, duration);
},
render() {
if (this.props.options.length === 0) {
return null;
}
const { prefixCls } = this.props;
return (
<div className={`${prefixCls}-select`}>
<ul ref="list">{this.getOptions()}</ul>
</div>
);
},
});
export default Select;
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