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<template>
<view class="u-radio" :style="[radioStyle]">
<view class="u-radio__icon-wrap" @tap="toggle" :class="[iconClass]" :style="[iconStyle]">
<u-icon
class="u-radio__icon-wrap__icon"
name="checkbox-mark"
:size="elIconSize"
:color="iconColor"/>
</view>
<view class="u-radio__label" @tap="onClickLabel" :style="{
fontSize: $u.addUnit(labelSize)
}">
<slot />
</view>
</view>
</template>
<script>
/**
* radio 单选框
* @description 单选框用于有一个选择,用户只能选择其中一个的场景。搭配u-radio-group使用
* @tutorial https://www.uviewui.com/components/radio.html
* @property {String Number} icon-size 图标大小,单位rpx(默认24)
* @property {String Number} label-size label字体大小,单位rpx(默认28)
* @property {String Number} name radio组件的标示符
* @property {String} shape 形状,见上方说明(默认circle)
* @property {Boolean} disabled 是否禁用(默认false)
* @property {Boolean} label-disabled 点击文本是否可以操作radio(默认true)
* @property {String} active-color 选中时的颜色,如设置parent的active-color将失效
* @event {Function} change 某个radio状态发生变化时触发(选中状态)
* @example <u-radio :label-disabled="false">门掩黄昏,无计留春住</u-radio>
*/
export default {
name: "u-radio",
props: {
// radio的名称
name: {
type: [String, Number],
default: ''
},
// 形状,square为方形,circle为原型
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parent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: ''
},
},
data() {
return {
// 父组件的默认值,因为头条小程序不支持在computed中使用this.parent.shape的形式
// 故只能使用如此方法
parentData: {
iconSize: null,
labelDisabled: null,
disabled: null,
shape: null,
activeColor: null,
size: null,
width: null,
height: null,
value: null,
wrap: null
}
};
},
created() {
this.parent = false;
// 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,避免循环引用
this.updateParentData();
this.parent.children.push(this);
},
computed: {
// 是否禁用,如果父组件u-raios-group禁用的话,将会忽略子组件的配置
elDisabled() {
return this.disabled !== '' ? this.disabled : this.parentData.disabled !== null ? this.parentData.disabled : false;
},
// 是否禁用label点击
elLabelDisabled() {
return this.labelDisabled !== '' ? this.labelDisabled : this.parentData.labelDisabled !== null ? this.parentData.labelDisabled : false;
},
// 组件尺寸,对应size的值,默认值为34rpx
elSize() {
return this.size ? this.size : (this.parentData.size ? this.parentData.size : 34);
},
// 组件的勾选图标的尺寸,默认20
elIconSize() {
return this.iconSize ? this.iconSize : (this.parentData.iconSize ? this.parentData.iconSize : 20);
},
// 组件选中激活时的颜色
elActiveColor() {
return this.activeColor ? this.activeColor : (this.parentData.activeColor ? this.parentData.activeColor : 'primary');
},
// 组件的形状
elShape() {
return this.shape ? this.shape : (this.parentData.shape ? this.parentData.shape : 'circle');
},
// 设置radio的状态,要求radio的name等于parent的value时才为选中状态
iconStyle() {
let style = {};
if (this.elActiveColor && this.parentData.value == this.name && !this.elDisabled) {
style.borderColor = this.elActiveColor;
style.backgroundColor = this.elActiveColor;
}
style.width = this.$u.addUnit(this.elSize);
style.height = this.$u.addUnit(this.elSize);
return style;
},
iconColor() {
return this.name == this.parentData.value ? '#ffffff' : 'transparent';
},
iconClass() {
let classes = [];
classes.push('u-radio__icon-wrap--' + this.elShape);
if (this.name == this.parentData.value) classes.push('u-radio__icon-wrap--checked');
if (this.elDisabled) classes.push('u-radio__icon-wrap--disabled');
if (this.name == this.parentData.value && this.elDisabled) classes.push(
'u-radio__icon-wrap--disabled--checked');
// 支付宝小程序无法动态绑定一个数组类名,否则解析出来的结果会带有",",而导致失效
return classes.join(' ');
},
radioStyle() {
let style = {};
if (this.parentData.width) {
style.width = this.$u.addUnit(this.parentData.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 ${this.$u.addUnit(this.parentData.width)}`;
// #endif
}
if (this.parentData.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;
}
},
methods: {
updateParentData() {
this.getParentData('u-radio-group');
},
onClickLabel() {
if (!this.elLabelDisabled && !this.elDisabled) {
this.setRadioCheckedStatus();
}
},
toggle() {
if (!this.elDisabled) {
this.setRadioCheckedStatus();
}
},
emitEvent() {
// u-radio的name不等于父组件的v-model的值时(意味着未选中),才发出事件,避免多次点击触发事件
if(this.parentData.value != this.name) this.$emit('change', this.name);
},
// 改变组件选中状态
// 这里的改变的依据是,更改本组件的parentData.value值为本组件的name值,同时通过父组件遍历所有u-radio实例
// 将本组件外的其他u-radio的parentData.value都设置为空(由computed计算后,都被取消选中状态),因而只剩下一个为选中状态
setRadioCheckedStatus() {
this.emitEvent();
if(this.parent) {
this.parent.setValue(this.name);
this.parentData.value = this.name;
}
}
}
};
</script>
<style lang="scss" scoped>
@import "../../libs/css/style.components.scss";
.u-radio {
/* #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;
@include vue-flex;
flex: none;
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: 3px;
}
&--checked {
color: #fff;
background-color: #2979ff;
border-color: #2979ff;
}
&--disabled {
background-color: #ebedf0;
border-color: #c8c9cc;
}
&--disabled--checked {
color: #c8c9cc !important;
}
}
&__label {
word-wrap: break-word;
margin-left: 10rpx;
margin-right: 24rpx;
color: $u-content-color;
font-size: 30rpx;
&--disabled {
color: #c8c9cc;
}
}
}
</style>