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1 | import React, { Component } from 'react'; | |
2 | import PropTypes from 'prop-types'; | |
3 | import ReactDom from 'react-dom'; | |
4 | import classnames from 'classnames'; | |
5 | ||
6 | const scrollTo = (element, to, duration) => { | |
7 | const requestAnimationFrame = window.requestAnimationFrame || | |
8 | function requestAnimationFrameTimeout() { | |
9 | return setTimeout(arguments[0], 10); | |
10 | }; | |
11 | // jump to target if duration zero | |
12 | if (duration <= 0) { | |
13 | element.scrollTop = to; | |
14 | return; | |
15 | } | |
16 | const difference = to - element.scrollTop; | |
17 | const perTick = difference / duration * 10; | |
18 | ||
19 | requestAnimationFrame(() => { | |
20 | element.scrollTop = element.scrollTop + perTick; | |
21 | if (element.scrollTop === to) return; | |
22 | scrollTo(element, to, duration - 10); | |
23 | }); | |
24 | }; | |
25 | ||
26 | class Select extends Component { | |
27 | static propTypes = { | |
28 | prefixCls: PropTypes.string, | |
29 | options: PropTypes.array, | |
30 | selectedIndex: PropTypes.number, | |
31 | type: PropTypes.string, | |
32 | onSelect: PropTypes.func, | |
33 | onMouseEnter: PropTypes.func, | |
34 | }; | |
35 | ||
36 | state = { | |
37 | active: false, | |
38 | }; | |
39 | ||
40 | componentDidMount() { | |
41 | // jump to selected option | |
42 | this.scrollToSelected(0); | |
43 | } | |
44 | ||
45 | componentDidUpdate(prevProps) { | |
46 | // smooth scroll to selected option | |
47 | if (prevProps.selectedIndex !== this.props.selectedIndex) { | |
48 | this.scrollToSelected(120); | |
49 | } | |
50 | } | |
51 | ||
52 | onSelect = (value) => { | |
53 | const { onSelect, type } = this.props; | |
54 | onSelect(type, value); | |
55 | } | |
56 | ||
57 | getOptions() { | |
58 | const { options, selectedIndex, prefixCls } = this.props; | |
59 | return options.map((item, index) => { | |
60 | const cls = classnames({ | |
61 | [`${prefixCls}-select-option-selected`]: selectedIndex === index, | |
62 | [`${prefixCls}-select-option-disabled`]: item.disabled, | |
63 | }); | |
64 | let onclick = null; | |
65 | if (!item.disabled) { | |
66 | onclick = this.onSelect.bind(this, item.value); | |
67 | } | |
68 | return (<li | |
69 | className={cls} | |
70 | key={index} | |
71 | onClick={onclick} | |
72 | disabled={item.disabled} | |
73 | > | |
74 | {item.value} | |
75 | </li>); | |
76 | }); | |
77 | } | |
78 | ||
79 | scrollToSelected(duration) { | |
80 | // move to selected item | |
81 | const select = ReactDom.findDOMNode(this); | |
82 | const list = ReactDom.findDOMNode(this.refs.list); | |
83 | if (!list) { | |
84 | return; | |
85 | } | |
86 | let index = this.props.selectedIndex; | |
87 | if (index < 0) { | |
88 | index = 0; | |
89 | } | |
90 | const topOption = list.children[index]; | |
91 | const to = topOption.offsetTop; | |
92 | scrollTo(select, to, duration); | |
93 | } | |
94 | ||
95 | handleMouseEnter = (e) => { | |
96 | this.setState({ active: true }); | |
97 | this.props.onMouseEnter(e); | |
98 | } | |
99 | ||
100 | handleMouseLeave = () => { | |
101 | this.setState({ active: false }); | |
102 | } | |
103 | ||
104 | render() { | |
105 | if (this.props.options.length === 0) { | |
106 | return null; | |
107 | } | |
108 | ||
109 | const { prefixCls } = this.props; | |
110 | const cls = classnames({ | |
111 | [`${prefixCls}-select`]: 1, | |
112 | [`${prefixCls}-select-active`]: this.state.active, | |
113 | }); | |
114 | ||
115 | return ( | |
116 | <div | |
117 | className={cls} | |
118 | onMouseEnter={this.handleMouseEnter} | |
119 | onMouseLeave={this.handleMouseLeave} | |
120 | > | |
121 | <ul ref="list">{this.getOptions()}</ul> | |
122 | </div> | |
123 | ); | |
124 | } | |
125 | } | |
126 | ||
127 | export default Select; |