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<template>
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<!-- #ifndef APP-NVUE -->
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<view :class="['uni-col', sizeClass, pointClassList]" :style="{
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paddingLeft:`${Number(gutter)}rpx`,
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paddingRight:`${Number(gutter)}rpx`,
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}">
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<slot></slot>
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</view>
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<!-- #endif -->
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<!-- #ifdef APP-NVUE -->
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<!-- 在nvue上，类名样式不生效，换为style -->
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<!-- 设置right正值失效，设置 left 负值 -->
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<view :class="['uni-col']" :style="{
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paddingLeft:`${Number(gutter)}rpx`,
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paddingRight:`${Number(gutter)}rpx`,
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width:`${nvueWidth}rpx`,
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position:'relative',
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marginLeft:`${marginLeft}rpx`,
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left:`${right === 0 ? left : -right}rpx`
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}">
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<slot></slot>
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</view>
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<!-- #endif -->
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</template>
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<script>
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/**
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* Col 布局-列
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* @description 搭配uni-row使用，构建布局。
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* @tutorial https://ext.dcloud.net.cn/plugin?id=3958
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*
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* @property {span} type = Number 栅格占据的列数
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* 默认 24
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* @property {offset} type = Number 栅格左侧的间隔格数
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* @property {push} type = Number 栅格向右移动格数
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* @property {pull} type = Number 栅格向左移动格数
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* @property {xs} type = [Number, Object] <768px 响应式栅格数或者栅格属性对象
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* @description Number时表示在此屏幕宽度下，栅格占据的列数。Object时可配置多个描述{span: 4, offset: 4}
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* @property {sm} type = [Number, Object] ≥768px 响应式栅格数或者栅格属性对象
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* @description Number时表示在此屏幕宽度下，栅格占据的列数。Object时可配置多个描述{span: 4, offset: 4}
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* @property {md} type = [Number, Object] ≥992px 响应式栅格数或者栅格属性对象
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* @description Number时表示在此屏幕宽度下，栅格占据的列数。Object时可配置多个描述{span: 4, offset: 4}
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* @property {lg} type = [Number, Object] ≥1200px 响应式栅格数或者栅格属性对象
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* @description Number时表示在此屏幕宽度下，栅格占据的列数。Object时可配置多个描述{span: 4, offset: 4}
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* @property {xl} type = [Number, Object] ≥1920px 响应式栅格数或者栅格属性对象
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* @description Number时表示在此屏幕宽度下，栅格占据的列数。Object时可配置多个描述{span: 4, offset: 4}
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*/
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const ComponentClass = 'uni-col';
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// -1 默认值，因为在微信小程序端只给Number会有默认值0
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export default {
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name: 'uniCol',
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// #ifdef MP-WEIXIN
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options: {
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virtualHost: true // 在微信小程序中将组件节点渲染为虚拟节点，更加接近Vue组件的表现
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},
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// #endif
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props: {
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span: {
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type: Number,
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default: 24
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},
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offset: {
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type: Number,
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default: -1
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},
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pull: {
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type: Number,
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default: -1
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},
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push: {
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type: Number,
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default: -1
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},
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xs: [Number, Object],
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sm: [Number, Object],
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md: [Number, Object],
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lg: [Number, Object],
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xl: [Number, Object]
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},
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data() {
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return {
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gutter: 0,
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sizeClass: '',
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parentWidth: 0,
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nvueWidth: 0,
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marginLeft: 0,
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right: 0,
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left: 0
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}
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},
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created() {
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// 字节小程序中，在computed中读取$parent为undefined
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let parent = this.$parent;
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while (parent && parent.$options.componentName !== 'uniRow') {
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parent = parent.$parent;
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}
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this.updateGutter(parent.gutter)
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parent.$watch('gutter', (gutter) => {
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this.updateGutter(gutter)
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})
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// #ifdef APP-NVUE
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this.updateNvueWidth(parent.width)
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parent.$watch('width', (width) => {
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this.updateNvueWidth(width)
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})
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// #endif
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},
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computed: {
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sizeList() {
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let {
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span,
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offset,
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pull,
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push
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} = this;
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return {
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span,
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offset,
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pull,
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push
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}
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},
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// #ifndef APP-NVUE
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pointClassList() {
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let classList = [];
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['xs', 'sm', 'md', 'lg', 'xl'].forEach(point => {
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const props = this[point];
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if (typeof props === 'number') {
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classList.push(`${ComponentClass}-${point}-${props}`)
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} else if (typeof props === 'object' && props) {
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Object.keys(props).forEach(pointProp => {
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classList.push(
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pointProp === 'span' ?
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`${ComponentClass}-${point}-${props[pointProp]}` :
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`${ComponentClass}-${point}-${pointProp}-${props[pointProp]}`
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)
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})
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}
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});
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// 支付宝小程序使用 :class=[ ['a','b'] ]，渲染错误
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return classList.join(' ');
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}
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// #endif
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},
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methods: {
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updateGutter(parentGutter) {
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parentGutter = Number(parentGutter);
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if (!isNaN(parentGutter)) {
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this.gutter = parentGutter / 2
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}
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},
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// #ifdef APP-NVUE
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updateNvueWidth(width) {
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// 用于在nvue端，span，offset，pull，push的计算
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this.parentWidth = width;
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['span', 'offset', 'pull', 'push'].forEach(size => {
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const curSize = this[size];
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if ((curSize || curSize === 0) && curSize !== -1) {
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let RPX = 1 / 24 * curSize * width
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RPX = Number(RPX);
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switch (size) {
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case 'span':
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this.nvueWidth = RPX
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break;
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case 'offset':
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this.marginLeft = RPX
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break;
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case 'pull':
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this.right = RPX
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break;
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case 'push':
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this.left = RPX
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break;
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}
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}
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});
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}
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// #endif
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},
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watch: {
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sizeList: {
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immediate: true,
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handler(newVal) {
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// #ifndef APP-NVUE
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let classList = [];
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for (let size in newVal) {
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const curSize = newVal[size];
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if ((curSize || curSize === 0) && curSize !== -1) {
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classList.push(
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size === 'span' ?
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`${ComponentClass}-${curSize}` :
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`${ComponentClass}-${size}-${curSize}`
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)
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}
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}
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// 支付宝小程序使用 :class=[ ['a','b'] ]，渲染错误
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this.sizeClass = classList.join(' ');
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// #endif
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// #ifdef APP-NVUE
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this.updateNvueWidth(this.parentWidth);
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// #endif
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}
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}
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}
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}
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</script>
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<style lang='scss' scoped>
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/* breakpoints */
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$--sm: 768px !default;
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$--md: 992px !default;
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$--lg: 1200px !default;
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$--xl: 1920px !default;
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$breakpoints: ('xs' : (max-width: $--sm - 1),
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'sm' : (min-width: $--sm),
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'md' : (min-width: $--md),
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'lg' : (min-width: $--lg),
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'xl' : (min-width: $--xl));
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$layout-namespace: ".uni-";
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$col: $layout-namespace+"col";
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@function getSize($size) {
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@return 1 / 24 * $size * 100 * 1%;
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}
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@mixin res($key, $map:$breakpoints) {
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@if map-has-key($map, $key) {
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@media screen and #{inspect(map-get($map,$key))} {
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@content;
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}
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}
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@else {
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@warn "Undeinfed point: `#{$key}`";
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}
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}
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/* #ifndef APP-NVUE */
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#{$col} {
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float: left;
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box-sizing: border-box;
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}
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#{$col}-0 {
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/* #ifdef APP-NVUE */
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width: 0;
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height: 0;
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margin-top: 0;
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margin-right: 0;
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margin-bottom: 0;
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margin-left: 0;
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/* #endif */
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/* #ifndef APP-NVUE */
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display: none;
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/* #endif */
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}
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@for $i from 0 through 24 {
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#{$col}-#{$i} {
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width: getSize($i);
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}
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#{$col}-offset-#{$i} {
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margin-left: getSize($i);
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}
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#{$col}-pull-#{$i} {
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position: relative;
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right: getSize($i);
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}
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#{$col}-push-#{$i} {
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position: relative;
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left: getSize($i);
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}
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}
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@each $point in map-keys($breakpoints) {
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@include res($point) {
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#{$col}-#{$point}-0 {
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display: none;
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}
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@for $i from 0 through 24 {
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#{$col}-#{$point}-#{$i} {
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width: getSize($i);
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}
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#{$col}-#{$point}-offset-#{$i} {
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margin-left: getSize($i);
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}
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#{$col}-#{$point}-pull-#{$i} {
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position: relative;
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right: getSize($i);
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}
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#{$col}-#{$point}-push-#{$i} {
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position: relative;
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left: getSize($i);
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}
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}
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}
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}
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/* #endif */
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</style>
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