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02de449a | 1 | import React, {PropTypes} from 'react'; |
2 | import ReactDom from 'react-dom'; | |
3 | import classnames from 'classnames'; | |
4 | ||
5 | const scrollTo = (element, to, duration) => { | |
6 | // jump to target if duration zero | |
7 | if (duration <= 0) { | |
8 | element.scrollTop = to; | |
9 | return; | |
10 | } | |
11 | const difference = to - element.scrollTop; | |
12 | const perTick = difference / duration * 10; | |
13 | ||
14 | setTimeout(() => { | |
15 | element.scrollTop = element.scrollTop + perTick; | |
16 | if (element.scrollTop === to) return; | |
17 | scrollTo(element, to, duration - 10); | |
18 | }, 10); | |
19 | }; | |
20 | ||
21 | const Select = React.createClass({ | |
22 | propTypes: { | |
23 | prefixCls: PropTypes.string, | |
24 | options: PropTypes.array, | |
25 | selectedIndex: PropTypes.number, | |
26 | type: PropTypes.string, | |
27 | onSelect: PropTypes.func, | |
28 | }, | |
29 | ||
30 | componentDidMount() { | |
31 | // jump to selected option | |
32 | this.scrollToSelected(0); | |
33 | }, | |
34 | ||
35 | componentDidUpdate() { | |
36 | // smooth scroll to selected option | |
37 | this.scrollToSelected(200); | |
38 | }, | |
39 | ||
40 | onSelect(event) { | |
41 | // do nothing when select selected option | |
42 | if (event.target.getAttribute('class') === 'selected') { | |
43 | return; | |
44 | } | |
45 | // change combobox selection | |
46 | const { onSelect, type } = this.props; | |
47 | const value = parseInt(event.target.innerHTML, 10); | |
48 | onSelect(type, value); | |
49 | }, | |
50 | ||
51 | getOptions() { | |
52 | const { options, selectedIndex } = this.props; | |
53 | return options.map((item, index) => { | |
54 | const cls = classnames({ selected: selectedIndex === index}); | |
55 | const ref = selectedIndex === index ? 'selected' : null; | |
56 | return <li ref={ref} className={cls} key={index} onClick={this.onSelect}>{item}</li>; | |
57 | }); | |
58 | }, | |
59 | ||
60 | scrollToSelected(duration) { | |
61 | // move to selected item | |
62 | const select = ReactDom.findDOMNode(this); | |
63 | const list = ReactDom.findDOMNode(this.refs.list); | |
64 | let index = this.props.selectedIndex - 2; | |
65 | if (index < 0) { | |
66 | index = 0; | |
67 | } | |
68 | const topOption = list.children[index]; | |
69 | const to = topOption.offsetTop - select.offsetTop; | |
70 | scrollTo(select, to, duration); | |
71 | }, | |
72 | ||
73 | render() { | |
74 | if (this.props.options.length === 0) { | |
75 | return null; | |
76 | } | |
77 | ||
78 | const { prefixCls } = this.props; | |
79 | ||
80 | return ( | |
81 | <div className={`${prefixCls}-select`}> | |
82 | <ul ref="list">{this.getOptions()}</ul> | |
83 | </div> | |
84 | ); | |
85 | }, | |
86 | }); | |
87 | ||
88 | export default Select; |