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import './VGrid.sass'
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3
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import Vue, { VNode, PropOptions } from 'vue'
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4
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import mergeData from '../../util/mergeData'
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5
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import { upperFirst } from '../../util/helpers'
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6
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7
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// no xs
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const breakpoints = ['sm', 'md', 'lg', 'xl']
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const breakpointProps = (() => {
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return breakpoints.reduce((props, val) => {
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props[val] = {
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type: [Boolean, String, Number],
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default: false,
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}
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return props
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}, {} as Dictionary<PropOptions>)
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})()
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const offsetProps = (() => {
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return breakpoints.reduce((props, val) => {
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props['offset' + upperFirst(val)] = {
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type: [String, Number],
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default: null,
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}
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return props
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}, {} as Dictionary<PropOptions>)
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})()
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const orderProps = (() => {
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return breakpoints.reduce((props, val) => {
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props['order' + upperFirst(val)] = {
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type: [String, Number],
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default: null,
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}
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return props
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}, {} as Dictionary<PropOptions>)
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})()
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40
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const propMap = {
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41
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col: Object.keys(breakpointProps),
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offset: Object.keys(offsetProps),
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order: Object.keys(orderProps),
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}
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45
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46
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function breakpointClass (type: keyof typeof propMap, prop: string, val: boolean | string | number) {
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47
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let className = type
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48
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1
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if (val == null || val === false) {
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return undefined
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}
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if (prop) {
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const breakpoint = prop.replace(type, '')
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className += `-${breakpoint}`
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}
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// Handling the boolean style prop when accepting [Boolean, String, Number]
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// means Vue will not convert <v-col sm></v-col> to sm: true for us.
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57
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// Since the default is false, an empty string indicates the prop's presence.
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58
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if (type === 'col' && (val === '' || val === true)) {
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59
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// .col-md
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60
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1
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return className.toLowerCase()
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61
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}
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62
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// .order-md-6
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63
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className += `-${val}`
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64
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1
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return className.toLowerCase()
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65
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}
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66
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67
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1
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const cache = new Map<string, any[]>()
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68
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69
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1
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export default Vue.extend({
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name: 'v-col',
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functional: true,
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props: {
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cols: {
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type: [Boolean, String, Number],
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default: false,
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76
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},
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77
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...breakpointProps,
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78
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offset: {
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79
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type: [String, Number],
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80
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default: null,
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81
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},
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82
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...offsetProps,
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83
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order: {
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84
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type: [String, Number],
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85
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default: null,
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86
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},
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87
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...orderProps,
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88
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alignSelf: {
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89
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type: String,
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90
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default: null,
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91
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1
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validator: (str: any) => ['auto', 'start', 'end', 'center', 'baseline', 'stretch'].includes(str),
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92
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},
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93
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tag: {
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94
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type: String,
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95
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default: 'div',
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96
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},
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97
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},
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98
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1
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render (h, { props, data, children, parent }): VNode {
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99
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// Super-fast memoization based on props, 5x faster than JSON.stringify
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100
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1
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let cacheKey = ''
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101
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1
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for (const prop in props) {
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102
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1
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cacheKey += String((props as any)[prop])
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103
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}
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104
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1
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let classList = cache.get(cacheKey)
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105
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106
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1
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if (!classList) {
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107
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1
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classList = []
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108
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// Loop through `col`, `offset`, `order` breakpoint props
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109
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let type: keyof typeof propMap
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110
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1
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for (type in propMap) {
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111
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1
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propMap[type].forEach(prop => {
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112
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1
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const value: string | number | boolean = (props as any)[prop]
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113
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1
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const className = breakpointClass(type, prop, value)
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114
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1
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if (className) classList!.push(className)
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115
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})
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116
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}
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117
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118
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1
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const hasColClasses = classList.some(className => className.startsWith('col-'))
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119
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120
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1
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classList.push({
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121
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// Default to .col if no other col-{bp}-* classes generated nor `cols` specified.
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122
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1
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col: !hasColClasses || !props.cols,
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123
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[`col-${props.cols}`]: props.cols,
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124
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[`offset-${props.offset}`]: props.offset,
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125
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[`order-${props.order}`]: props.order,
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126
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[`align-self-${props.alignSelf}`]: props.alignSelf,
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127
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})
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128
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129
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1
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cache.set(cacheKey, classList)
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130
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}
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131
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132
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1
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return h(props.tag, mergeData(data, { class: classList }), children)
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133
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},
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134
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})
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mcdmaster