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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 | const requestAnimationFrame = window.requestAnimationFrame || | |
7 | function requestAnimationFrameTimeout() { | |
8 | return setTimeout(arguments[0], 10); | |
9 | }; | |
10 | // jump to target if duration zero | |
11 | if (duration <= 0) { | |
12 | element.scrollTop = to; | |
13 | return; | |
14 | } | |
15 | const difference = to - element.scrollTop; | |
16 | const perTick = difference / duration * 10; | |
17 | ||
18 | requestAnimationFrame(() => { | |
19 | element.scrollTop = element.scrollTop + perTick; | |
20 | if (element.scrollTop === to) return; | |
21 | scrollTo(element, to, duration - 10); | |
22 | }); | |
23 | }; | |
24 | ||
25 | const Select = React.createClass({ | |
26 | propTypes: { | |
27 | prefixCls: PropTypes.string, | |
28 | options: PropTypes.array, | |
29 | gregorianCalendarLocale: PropTypes.object, | |
30 | selectedIndex: PropTypes.number, | |
31 | type: PropTypes.string, | |
32 | onSelect: PropTypes.func, | |
33 | onMouseEnter: PropTypes.func, | |
34 | }, | |
35 | ||
36 | componentDidMount() { | |
37 | // jump to selected option | |
38 | this.scrollToSelected(0); | |
39 | }, | |
40 | ||
41 | componentDidUpdate() { | |
42 | // smooth scroll to selected option | |
43 | this.scrollToSelected(120); | |
44 | }, | |
45 | ||
46 | onSelect(value) { | |
47 | const { onSelect, type } = this.props; | |
48 | onSelect(type, value); | |
49 | }, | |
50 | ||
51 | getOptions() { | |
52 | const { options, selectedIndex, prefixCls } = this.props; | |
53 | return options.map((item, index) => { | |
54 | const selected = selectedIndex === index; | |
55 | const cls = classnames({ | |
56 | [`${prefixCls}-select-option-selected`]: selected, | |
57 | }); | |
58 | return <li className={cls} key={index} onClick={this.onSelect.bind(this, +item)}>{item}</li>; | |
59 | }); | |
60 | }, | |
61 | ||
62 | scrollToSelected(duration) { | |
63 | // move to selected item | |
64 | const select = ReactDom.findDOMNode(this); | |
65 | const list = ReactDom.findDOMNode(this.refs.list); | |
66 | let index = this.props.selectedIndex; | |
67 | if (index < 0) { | |
68 | index = 0; | |
69 | } | |
70 | const topOption = list.children[index]; | |
71 | const to = topOption.offsetTop; | |
72 | scrollTo(select, to, duration); | |
73 | }, | |
74 | ||
75 | render() { | |
76 | if (this.props.options.length === 0) { | |
77 | return null; | |
78 | } | |
79 | ||
80 | const { prefixCls } = this.props; | |
81 | ||
82 | return ( | |
83 | <div className={`${prefixCls}-select`} | |
84 | onMouseEnter={this.props.onMouseEnter}> | |
85 | <ul ref="list">{this.getOptions()}</ul> | |
86 | </div> | |
87 | ); | |
88 | }, | |
89 | }); | |
90 | ||
91 | export default Select; |