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<template>
<view
class="u-subsection"
ref="u-subsection"
:class="[`u-subsection--${mode}`]"
:style="[$u.addStyle(customStyle), wrapperStyle]"
>
<view
class="u-subsection__bar"
ref="u-subsection__bar"
:style="[barStyle]"
:class="[
mode === 'button' && 'u-subsection--button__bar',
current === 0 &&
mode === 'subsection' &&
'u-subsection__bar--first',
current > 0 &&
current < list.length - 1 &&
mode === 'subsection' &&
'u-subsection__bar--center',
current === list.length - 1 &&
mode === 'subsection' &&
'u-subsection__bar--last',
]"
></view>
<view
class="u-subsection__item"
:class="[
`u-subsection__item--${index}`,
index < list.length - 1 &&
'u-subsection__item--no-border-right',
index === 0 && 'u-subsection__item--first',
index === list.length - 1 && 'u-subsection__item--last',
]"
:ref="`u-subsection__item--${index}`"
:style="[itemStyle(index)]"
@tap="clickHandler(index)"
v-for="(item, index) in list"
:key="index"
>
<text
class="u-subsection__item__text"
:style="[textStyle(index)]"
>{{ getText(item) }}</text
>
</view>
</view>
</template>
<script>
// #ifdef APP-NVUE
const dom = uni.requireNativePlugin("dom");
const animation = uni.requireNativePlugin("animation");
// #endif
import props from "./props.js";
/**
* Subsection 分段器
* @description 该分段器一般用于用户从几个选项中选择某一个的场景
* @tutorial https://www.uviewui.com/components/subsection.html
* @property {Array} list tab的数据
* @property {String | Number} current 当前活动的tab的index(默认 0 )
* @property {String} activeColor 激活时的颜色(默认 '#3c9cff' )
* @property {String} inactiveColor 未激活时的颜色(默认 '#303133' )
* @property {String} mode 模式选择,mode=button为按钮形式,mode=subsection时为分段模式(默认 'button' )
* @property {String | Number} fontSize 字体大小,单位px(默认 12 )
* @property {Boolean} bold 激活选项的字体是否加粗(默认 true )
* @property {String} bgColor 组件背景颜色,mode为button时有效(默认 '#eeeeef' )
* @property {Object} customStyle 定义需要用到的外部样式
* @property {String} keyName 从`list`元素对象中读取的键名(默认 'name' )
*
* @event {Function} change 分段器选项发生改变时触发 回调 index:选项的index索引值,从0开始
* @example <u-subsection :list="list" :current="curNow" @change="sectionChange"></u-subsection>
*/
export default {
name: "u-subsection",
mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
data() {
return {
// 组件尺寸
itemRect: {
width: 0,
height: 0,
},
};
},
watch: {
list(newValue, oldValue) {
this.init();
},
current: {
immediate: true,
handler(n) {
// #ifdef APP-NVUE
// 在安卓nvue上,如果通过translateX进行位移,到最后一个时,会导致右侧无法绘制圆角
// 故用animation模块进行位移
const ref = this.$refs?.["u-subsection__bar"]?.ref;
// 不存在ref的时候(理解为第一次初始化时,需要渲染dom,进行一定延时再获取ref),这里的100ms是经过测试得出的结果(某些安卓需要延时久一点),勿随意修改
uni.$u.sleep(ref ? 0 : 100).then(() => {
animation.transition(this.$refs["u-subsection__bar"].ref, {
styles: {
transform: `translateX(${
n * this.itemRect.width
}px)`,
transformOrigin: "center center",
},
duration: 300,
});
});
// #endif
},
},
},
computed: {
wrapperStyle() {
const style = {};
// button模式时,设置背景色
if (this.mode === "button") {
style.backgroundColor = this.bgColor;
}
return style;
},
// 滑块的样式
barStyle() {
const style = {};
style.width = `${this.itemRect.width}px`;
style.height = `${this.itemRect.height}px`;
// 通过translateX移动滑块,其移动的距离为索引*item的宽度
// #ifndef APP-NVUE
style.transform = `translateX(${
this.current * this.itemRect.width
}px)`;
// #endif
if (this.mode === "subsection") {
// 在subsection模式下,需要动态设置滑块的圆角,因为移动滑块使用的是translateX,无法通过父元素设置overflow: hidden隐藏滑块的直角
style.backgroundColor = this.activeColor;
}
return style;
},
// 分段器item的样式
itemStyle(index) {
return (index) => {
const style = {};
if (this.mode === "subsection") {
// 设置border的样式
style.borderColor = this.activeColor;
style.borderWidth = "1px";
style.borderStyle = "solid";
}
return style;
};
},
// 分段器文字颜色
textStyle(index) {
return (index) => {
const style = {};
style.fontWeight =
this.bold && this.current === index ? "bold" : "normal";
style.fontSize = uni.$u.addUnit(this.fontSize);
// subsection模式下,激活时默认为白色的文字
if (this.mode === "subsection") {
style.color =
this.current === index ? "#fff" : this.inactiveColor;
} else {
// button模式下,激活时文字颜色默认为activeColor
style.color =
this.current === index
? this.activeColor
: this.inactiveColor;
}
return style;
};
},
},
mounted() {
this.init();
},
methods: {
init() {
uni.$u.sleep().then(() => this.getRect());
},
// 判断展示文本
getText(item) {
return typeof item === 'object' ? item[this.keyName] : item
},
// 获取组件的尺寸
getRect() {
// #ifndef APP-NVUE
this.$uGetRect(".u-subsection__item--0").then((size) => {
this.itemRect = size;
});
// #endif
// #ifdef APP-NVUE
const ref = this.$refs["u-subsection__item--0"][0];
ref &&
dom.getComponentRect(ref, (res) => {
this.itemRect = res.size;
});
// #endif
},
clickHandler(index) {
this.$emit("change", index);
},
},
};
</script>
<style lang="scss" scoped>
@import "../../libs/css/components.scss";
.u-subsection {
@include flex;
position: relative;
overflow: hidden;
/* #ifndef APP-NVUE */
width: 100%;
box-sizing: border-box;
/* #endif */
&--button {
height: 32px;
background-color: rgb(238, 238, 239);
padding: 3px;
border-radius: 3px;
align-items: stretch;
&__bar {
background-color: #ffffff;
border-radius: 3px !important;
}
}
&--subsection {
height: 30px;
}
&__bar {
position: absolute;
/* #ifndef APP-NVUE */
transition-property: transform, color;
transition-duration: 0.3s;
transition-timing-function: ease-in-out;
/* #endif */
&--first {
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
border-top-right-radius: 0px;
border-bottom-right-radius: 0px;
}
&--center {
border-top-left-radius: 0px;
border-bottom-left-radius: 0px;
border-top-right-radius: 0px;
border-bottom-right-radius: 0px;
}
&--last {
border-top-left-radius: 0px;
border-bottom-left-radius: 0px;
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
}
}
&__item {
@include flex;
flex: 1;
justify-content: center;
align-items: center;
// vue环境下,需要设置相对定位,因为滑块为绝对定位,item需要在滑块的上面
position: relative;
&--no-border-right {
border-right-width: 0 !important;
}
&--first {
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
}
&--last {
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;
}
&__text {
font-size: 12px;
line-height: 12px;
@include flex;
align-items: center;
transition-property: color;
transition-duration: 0.3s;
}
}
}
</style>