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<template>
<view class="u-checkbox" :style="[checkboxStyle]">
<view class="u-checkbox__icon-wrap" @tap="toggle" :class="[iconClass]" :style="[iconStyle]">
<u-icon v-if="indeterminate" class="u-checkbox__icon-wrap__icon" name="minus" :size="checkboxIconSize" :color="iconColor" />
<u-icon v-else class="u-checkbox__icon-wrap__icon" name="checkbox-mark" :size="checkboxIconSize" :color="iconColor" />
</view>
<view
class="u-checkbox__label"
@tap="onClickLabel"
:style="{
fontSize: $u.addUnit(labelSize)
}"
>
<slot />
</view>
</view>
</template>
<script>
/**
* checkbox 复选框
* @description 该组件需要搭配checkboxGroup组件使用,以便用户进行操作时,获得当前复选框组的选中情况。
* @tutorial https://www.uviewui.com/components/checkbox.html
* @property {String Number} icon-size 图标大小,单位rpx(默认20)
* @property {String Number} label-size label字体大小,单位rpx(默认28)
* @property {String Number} name checkbox组件的标示符
* @property {String} shape 形状,外观形状,shape-方形,circle-圆形(默认circle)
* @property {Boolean} disabled 是否禁用
* @property {Boolean} label-disabled 是否禁止点击文本操作checkbox
* @property {String} active-color 选中时的颜色,如设置CheckboxGroup的active-color将失效
* @event {Function} change 某个checkbox状态发生变化时触发,回调为一个对象
* @example <u-checkbox v-model="checked" :disabled="false">天涯</u-checkbox>
*/
export default {
name: "u-checkbox",
emits: ["update:modelValue", "input", "change"],
props: {
// 是否为选中状态
value: {
type: Boolean,
default: false
},
modelValue: {
type: Boolean,
default: false
},
// checkbox的名称
name: {
type: [String, Number],
default: ""
},
// 形状,square为方形,circle为圆型
shape: {
type: String,
default: ""
},
// 是否禁用
disabled: {
type: [String, Boolean],
default: ""
},
// 是否禁止点击提示语选中复选框
labelDisabled: {
type: [String, Boolean],
default: ""
},
// 选中状态下的颜色,如设置此值,将会覆盖checkboxGroup的activeColor值
activeColor: {
type: String,
default: ""
},
// 图标的大小,单位rpx
iconSize: {
type: [String, Number],
default: ""
},
// label的字体大小,rpx单位
labelSize: {
type: [String, Number],
default: ""
},
// 组件的整体大小
size: {
type: [String, Number],
default: ""
},
// 设置不确定状态,仅负责样式控制
indeterminate: {
type: Boolean,
default: false
}
},
data() {
return {
parentDisabled: false,
newParams: {}
};
},
created() {
// 支付宝小程序不支持provide/inject,所以使用这个方法获取整个父组件,在created定义,避免循环应用
this.parent = this.$u.$parent.call(this, "u-checkbox-group");
// 如果存在u-checkbox-group,将本组件的this塞进父组件的children中
this.parent && this.parent.children.push(this);
},
computed: {
valueCom() {
// #ifndef VUE3
return this.value;
// #endif
// #ifdef VUE3
return this.modelValue;
// #endif
},
// 是否禁用,如果父组件u-checkbox-group禁用的话,将会忽略子组件的配置
isDisabled() {
return this.disabled !== "" ? this.disabled : this.parent ? this.parent.disabled : false;
},
// 是否禁用label点击
isLabelDisabled() {
return this.labelDisabled !== "" ? this.labelDisabled : this.parent ? this.parent.labelDisabled : false;
},
// 组件尺寸,对应size的值,默认值为34rpx
checkboxSize() {
return this.size ? this.size : this.parent ? this.parent.size : 34;
},
// 组件的勾选图标的尺寸,默认20
checkboxIconSize() {
return this.iconSize ? this.iconSize : this.parent ? this.parent.iconSize : 20;
},
// 组件选中激活时的颜色
elActiveColor() {
return this.activeColor ? this.activeColor : this.parent ? this.parent.activeColor : "primary";
},
// 组件的形状
elShape() {
return this.shape ? this.shape : this.parent ? this.parent.shape : "square";
},
iconStyle() {
let style = {};
// 既要判断是否手动禁用,还要判断用户v-model绑定的值,如果绑定为false,那么也无法选中
if (this.elActiveColor && this.valueCom && !this.isDisabled) {
style.borderColor = this.elActiveColor;
style.backgroundColor = this.elActiveColor;
}
style.width = this.$u.addUnit(this.checkboxSize);
style.height = this.$u.addUnit(this.checkboxSize);
return style;
},
// 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
iconColor() {
if (this.indeterminate) return '#ffffff';
return this.valueCom ? "#ffffff" : "transparent";
},
iconClass() {
let classes = [];
classes.push("u-checkbox__icon-wrap--" + this.elShape);
if (this.valueCom == true) classes.push("u-checkbox__icon-wrap--checked");
if (this.isDisabled) classes.push("u-checkbox__icon-wrap--disabled");
if (this.valueCom && this.isDisabled) classes.push("u-checkbox__icon-wrap--disabled--checked");
if (this.indeterminate === true) classes.push('u-checkbox__icon-wrap--indeterminate')
// 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
return classes.join(" ");
},
checkboxStyle() {
let style = {};
if (this.parent && this.parent.width) {
style.width = this.parent.width;
// #ifdef MP
// 各家小程序因为它们特殊的编译结构,使用float布局
style.float = "left";
// #endif
// #ifndef MP
// H5和APP使用flex布局
style.flex = `0 0 ${this.parent.width}`;
// #endif
}
if (this.parent && this.parent.wrap) {
style.width = "100%";
// #ifndef MP
// H5和APP使用flex布局,将宽度设置100%,即可自动换行
style.flex = "0 0 100%";
// #endif
}
return style;
}
},
mounted() {
this._emitEvent();
},
watch: {
valueCom: {
handler: function(newVal, oldVal) {
this._emitEvent();
}
}
},
methods: {
_emitEvent() {
let value = this.valueCom;
let obj = {
value,
name: this.name
};
// 执行父组件u-checkbox-group的事件方法
if (this.parent && this.parent.emitEvent) this.parent.emitEvent(obj);
},
onClickLabel() {
if (!this.isLabelDisabled && !this.isDisabled) {
this.setValue();
}
},
toggle() {
if (!this.isDisabled) {
this.setValue();
}
},
emitEvent() {
let obj = {
value: !this.valueCom,
name: this.name
};
this.$emit("change", obj);
// 执行父组件u-checkbox-group的事件方法
if (this.parent && this.parent.emitEvent) this.parent.emitEvent(obj);
},
// 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
setValue() {
let value = this.valueCom;
// 判断是否超过了可选的最大数量
let checkedNum = 0;
if (this.parent && this.parent.children) {
// 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)
this.parent.children.map(val => {
if (val.value) checkedNum++;
});
}
// 如果原来为选中状态,那么可以取消
if (value == true) {
this.emitEvent();
this.$emit("input", !value);
this.$emit("update:modelValue", !value);
} else {
// 如果超出最多可选项,提示
if (this.parent && checkedNum >= this.parent.max) {
return this.$u.toast(`最多可选${this.parent.max}`);
}
// 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
this.emitEvent();
this.$emit("input", !value);
this.$emit("update:modelValue", !value);
}
}
}
};
</script>
<style lang="scss" scoped>
@import "../../libs/css/style.components.scss";
.u-checkbox {
/* #ifndef APP-NVUE */
display: inline-flex;
/* #endif */
align-items: center;
overflow: hidden;
user-select: none;
line-height: 1.8;
&__icon-wrap {
color: $u-content-color;
flex: none;
display: -webkit-flex;
@include vue-flex;
align-items: center;
justify-content: center;
box-sizing: border-box;
width: 42rpx;
height: 42rpx;
color: transparent;
text-align: center;
transition-property: color, border-color, background-color;
font-size: 20px;
border: 1px solid #c8c9cc;
transition-duration: 0.2s;
/* #ifdef MP-TOUTIAO */
// 头条小程序兼容性问题,需要设置行高为0,否则图标偏下
&__icon {
line-height: 0;
}
/* #endif */
&--circle {
border-radius: 100%;
}
&--square {
border-radius: 6rpx;
}
&--checked {
color: #fff;
background-color: $u-type-primary;
border-color: $u-type-primary;
}
&--disabled {
background-color: #ebedf0;
border-color: #c8c9cc;
}
&--disabled--checked {
color: #c8c9cc !important;
}
&--indeterminate {
color: #fff;
background-color: $u-type-primary;
border-color: $u-type-primary;
}
}
&__label {
word-wrap: break-word;
margin-left: 10rpx;
margin-right: 24rpx;
color: $u-content-color;
font-size: 30rpx;
&--disabled {
color: #c8c9cc;
}
}
}
</style>