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285 lines
8.3 KiB
285 lines
8.3 KiB
3 years ago
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<template>
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<view class="u-checkbox" :style="[checkboxStyle]">
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<view class="u-checkbox__icon-wrap" @tap="toggle" :class="[iconClass]" :style="[iconStyle]">
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<u-icon class="u-checkbox__icon-wrap__icon" name="checkbox-mark" :size="checkboxIconSize" :color="iconColor"/>
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</view>
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<view class="u-checkbox__label" @tap="onClickLabel" :style="{
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fontSize: $u.addUnit(labelSize)
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}">
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<slot />
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</view>
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</view>
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</template>
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<script>
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/**
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* checkbox 复选框
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* @description 该组件需要搭配checkboxGroup组件使用，以便用户进行操作时，获得当前复选框组的选中情况。
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* @tutorial https://www.uviewui.com/components/checkbox.html
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* @property {String Number} icon-size 图标大小，单位rpx（默认20）
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* @property {String Number} label-size label字体大小，单位rpx（默认28）
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* @property {String Number} name checkbox组件的标示符
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* @property {String} shape 形状，见官网说明（默认circle）
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* @property {Boolean} disabled 是否禁用
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* @property {Boolean} label-disabled 是否禁止点击文本操作checkbox
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* @property {String} active-color 选中时的颜色，如设置CheckboxGroup的active-color将失效
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* @event {Function} change 某个checkbox状态发生变化时触发，回调为一个对象
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* @example <u-checkbox v-model="checked" :disabled="false">天涯</u-checkbox>
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*/
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export default {
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name: "u-checkbox",
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props: {
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// checkbox的名称
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name: {
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type: [String, Number],
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default: ''
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},
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// 形状，square为方形，circle为原型
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shape: {
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type: String,
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default: ''
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},
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// 是否为选中状态
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value: {
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type: Boolean,
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default: false
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},
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// 是否禁用
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disabled: {
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type: [String, Boolean],
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default: ''
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},
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// 是否禁止点击提示语选中复选框
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labelDisabled: {
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type: [String, Boolean],
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default: ''
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},
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// 选中状态下的颜色，如设置此值，将会覆盖checkboxGroup的activeColor值
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activeColor: {
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type: String,
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default: ''
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},
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// 图标的大小，单位rpx
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iconSize: {
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type: [String, Number],
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default: ''
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},
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// label的字体大小，rpx单位
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labelSize: {
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type: [String, Number],
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default: ''
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},
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// 组件的整体大小
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size: {
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type: [String, Number],
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default: ''
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},
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},
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data() {
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return {
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parentDisabled: false,
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newParams: {},
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};
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},
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created() {
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// 支付宝小程序不支持provide/inject，所以使用这个方法获取整个父组件，在created定义，避免循环应用
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this.parent = this.$u.$parent.call(this, 'u-checkbox-group');
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// 如果存在u-checkbox-group，将本组件的this塞进父组件的children中
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this.parent && this.parent.children.push(this);
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},
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computed: {
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// 是否禁用，如果父组件u-checkbox-group禁用的话，将会忽略子组件的配置
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isDisabled() {
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return this.disabled !== '' ? this.disabled : this.parent ? this.parent.disabled : false;
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},
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// 是否禁用label点击
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isLabelDisabled() {
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return this.labelDisabled !== '' ? this.labelDisabled : this.parent ? this.parent.labelDisabled : false;
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},
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// 组件尺寸，对应size的值，默认值为34rpx
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checkboxSize() {
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return this.size ? this.size : (this.parent ? this.parent.size : 34);
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},
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// 组件的勾选图标的尺寸，默认20
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checkboxIconSize() {
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return this.iconSize ? this.iconSize : (this.parent ? this.parent.iconSize : 20);
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},
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// 组件选中激活时的颜色
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elActiveColor() {
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return this.activeColor ? this.activeColor : (this.parent ? this.parent.activeColor : 'primary');
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},
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// 组件的形状
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elShape() {
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return this.shape ? this.shape : (this.parent ? this.parent.shape : 'square');
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},
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iconStyle() {
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let style = {};
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// 既要判断是否手动禁用，还要判断用户v-model绑定的值，如果绑定为false，那么也无法选中
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if (this.elActiveColor && this.value && !this.isDisabled) {
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style.borderColor = this.elActiveColor;
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style.backgroundColor = this.elActiveColor;
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}
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style.width = this.$u.addUnit(this.checkboxSize);
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style.height = this.$u.addUnit(this.checkboxSize);
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return style;
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},
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// checkbox内部的勾选图标，如果选中状态，为白色，否则为透明色即可
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iconColor() {
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return this.value ? '#ffffff' : 'transparent';
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},
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iconClass() {
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let classes = [];
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classes.push('u-checkbox__icon-wrap--' + this.elShape);
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if (this.value == true) classes.push('u-checkbox__icon-wrap--checked');
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if (this.isDisabled) classes.push('u-checkbox__icon-wrap--disabled');
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if (this.value && this.isDisabled) classes.push('u-checkbox__icon-wrap--disabled--checked');
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// 支付宝小程序无法动态绑定一个数组类名，否则解析出来的结果会带有","，而导致失效
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return classes.join(' ');
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},
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checkboxStyle() {
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let style = {};
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if(this.parent && this.parent.width) {
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style.width = this.parent.width;
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// #ifdef MP
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// 各家小程序因为它们特殊的编译结构，使用float布局
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style.float = 'left';
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// #endif
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// #ifndef MP
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// H5和APP使用flex布局
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style.flex = `0 0 ${this.parent.width}`;
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// #endif
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}
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if(this.parent && this.parent.wrap) {
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style.width = '100%';
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// #ifndef MP
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// H5和APP使用flex布局，将宽度设置100%，即可自动换行
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style.flex = '0 0 100%';
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// #endif
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}
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return style;
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}
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},
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methods: {
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onClickLabel() {
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if (!this.isLabelDisabled && !this.isDisabled) {
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this.setValue();
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}
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},
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toggle() {
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if (!this.isDisabled) {
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this.setValue();
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}
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},
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emitEvent() {
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this.$emit('change', {
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value: !this.value,
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name: this.name
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})
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// 执行父组件u-checkbox-group的事件方法
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// 等待下一个周期再执行，因为this.$emit('input')作用于父组件，再反馈到子组件内部，需要时间
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setTimeout(() => {
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if(this.parent && this.parent.emitEvent) this.parent.emitEvent();
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}, 80);
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},
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// 设置input的值，这里通过input事件，设置通过v-model绑定的组件的值
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setValue() {
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// 判断是否超过了可选的最大数量
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let checkedNum = 0;
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if(this.parent && this.parent.children) {
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// 只要父组件的某一个子元素的value为true，就加1(已有的选中数量)
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this.parent.children.map(val => {
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if (val.value) checkedNum++;
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})
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}
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// 如果原来为选中状态，那么可以取消
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if (this.value == true) {
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this.emitEvent();
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this.$emit('input', !this.value);
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} else {
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// 如果超出最多可选项，提示
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if(this.parent && checkedNum >= this.parent.max) {
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return this.$u.toast(`最多可选${this.parent.max}项`);
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}
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// 如果原来为未选中状态，需要选中的数量少于父组件中设置的max值，才可以选中
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this.emitEvent();
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this.$emit('input', !this.value);
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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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@import "../../libs/css/style.components.scss";
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.u-checkbox {
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/* #ifndef APP-NVUE */
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display: inline-flex;
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/* #endif */
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align-items: center;
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overflow: hidden;
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user-select: none;
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line-height: 1.8;
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&__icon-wrap {
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color: $u-content-color;
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flex: none;
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display: -webkit-flex;
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@include vue-flex;
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align-items: center;
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justify-content: center;
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box-sizing: border-box;
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width: 42rpx;
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height: 42rpx;
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color: transparent;
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text-align: center;
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transition-property: color, border-color, background-color;
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font-size: 20px;
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border: 1px solid #c8c9cc;
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transition-duration: 0.2s;
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/* #ifdef MP-TOUTIAO */
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// 头条小程序兼容性问题，需要设置行高为0，否则图标偏下
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&__icon {
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line-height: 0;
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}
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/* #endif */
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&--circle {
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border-radius: 100%;
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}
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&--square {
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border-radius: 6rpx;
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}
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&--checked {
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color: #fff;
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background-color: $u-type-primary;
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border-color: $u-type-primary;
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}
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&--disabled {
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background-color: #ebedf0;
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border-color: #c8c9cc;
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}
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&--disabled--checked {
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color: #c8c9cc !important;
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}
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}
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&__label {
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word-wrap: break-word;
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margin-left: 10rpx;
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margin-right: 24rpx;
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color: $u-content-color;
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font-size: 30rpx;
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&--disabled {
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color: #c8c9cc;
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}
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}
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}
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</style>
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