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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(prevProps) { | |
42 | // smooth scroll to selected option | |
43 | if (prevProps.selectedIndex !== this.props.selectedIndex) { | |
44 | this.scrollToSelected(120); | |
45 | } | |
46 | }, | |
47 | ||
48 | onSelect(value) { | |
49 | const { onSelect, type } = this.props; | |
50 | onSelect(type, value); | |
51 | }, | |
52 | ||
53 | getOptions() { | |
54 | const { options, selectedIndex, prefixCls } = this.props; | |
55 | return options.map((item, index) => { | |
56 | const cls = classnames({ | |
57 | [`${prefixCls}-select-option-selected`]: selectedIndex === index, | |
58 | [`${prefixCls}-select-option-disabled`]: item.disabled, | |
59 | }); | |
60 | let onclick = null; | |
61 | if (!item.disabled) { | |
62 | onclick = this.onSelect.bind(this, +item.value); | |
63 | } | |
64 | return <li className={cls} key={index} onClick={onclick} disabled={item.disabled}>{item.value}</li>; | |
65 | }); | |
66 | }, | |
67 | ||
68 | scrollToSelected(duration) { | |
69 | // move to selected item | |
70 | const select = ReactDom.findDOMNode(this); | |
71 | const list = ReactDom.findDOMNode(this.refs.list); | |
72 | let index = this.props.selectedIndex; | |
73 | if (index < 0) { | |
74 | index = 0; | |
75 | } | |
76 | const topOption = list.children[index]; | |
77 | const to = topOption.offsetTop; | |
78 | scrollTo(select, to, duration); | |
79 | }, | |
80 | ||
81 | render() { | |
82 | if (this.props.options.length === 0) { | |
83 | return null; | |
84 | } | |
85 | ||
86 | const { prefixCls } = this.props; | |
87 | ||
88 | return ( | |
89 | <div className={`${prefixCls}-select`} | |
90 | onMouseEnter={this.props.onMouseEnter}> | |
91 | <ul ref="list">{this.getOptions()}</ul> | |
92 | </div> | |
93 | ); | |
94 | }, | |
95 | }); | |
96 | ||
97 | export default Select; |