316 lines
8.0 KiB
Python
316 lines
8.0 KiB
Python
<template>
|
||
<!-- 支付宝小程序使用$u.getRect()获取组件的根元素尺寸，所以在外面套一个"壳" -->
|
||
<view>
|
||
<view class="u-index-bar">
|
||
<slot />
|
||
<view v-if="showSidebar" class="u-index-bar__sidebar" @touchstart.stop.prevent="onTouchMove" @touchmove.stop.prevent="onTouchMove"
|
||
@touchend.stop.prevent="onTouchStop" @touchcancel.stop.prevent="onTouchStop">
|
||
<view v-for="(item, index) in indexList" :key="index" class="u-index-bar__index" :style="{zIndex: zIndex + 1, color: activeAnchorIndex === index ? activeColor : ''}"
|
||
:data-index="index">
|
||
{{ item }}
|
||
</view>
|
||
</view>
|
||
<view class="u-indexed-list-alert" v-if="touchmove && indexList[touchmoveIndex]" :style="{
|
||
zIndex: alertZIndex
|
||
}">
|
||
<text>{{indexList[touchmoveIndex]}}</text>
|
||
</view>
|
||
</view>
|
||
</view>
|
||
</template>
|
||
|
||
<script>
|
||
var indexList = function() {
|
||
var indexList = [];
|
||
var charCodeOfA = 'A'.charCodeAt(0);
|
||
for (var i = 0; i < 26; i++) {
|
||
indexList.push(String.fromCharCode(charCodeOfA + i));
|
||
}
|
||
return indexList;
|
||
};
|
||
|
||
/**
|
||
* indexList 索引列表
|
||
* @description 通过折叠面板收纳内容区域,搭配<u-index-anchor>使用
|
||
* @tutorial https://www.uviewui.com/components/indexList.html#indexanchor-props
|
||
* @property {Number String} scroll-top 当前滚动高度，自定义组件无法获得滚动条事件，所以依赖接入方传入
|
||
* @property {Array} index-list 索引字符列表，数组（默认A-Z）
|
||
* @property {Number String} z-index 锚点吸顶时的层级（默认965）
|
||
* @property {Boolean} sticky 是否开启锚点自动吸顶（默认true）
|
||
* @property {Number String} offset-top 锚点自动吸顶时与顶部的距离（默认0）
|
||
* @property {String} highlight-color 锚点和右边索引字符高亮颜色（默认#2979ff）
|
||
* @event {Function} select 选中右边索引字符时触发
|
||
* @example <u-index-list :scrollTop="scrollTop"></u-index-list>
|
||
*/
|
||
export default {
|
||
name: "u-index-list",
|
||
props: {
|
||
sticky: {
|
||
type: Boolean,
|
||
default: true
|
||
},
|
||
zIndex: {
|
||
type: [Number, String],
|
||
default: ''
|
||
},
|
||
scrollTop: {
|
||
type: [Number, String],
|
||
default: 0,
|
||
},
|
||
offsetTop: {
|
||
type: [Number, String],
|
||
default: 0
|
||
},
|
||
indexList: {
|
||
type: Array,
|
||
default () {
|
||
return indexList()
|
||
}
|
||
},
|
||
activeColor: {
|
||
type: String,
|
||
default: '#2979ff'
|
||
}
|
||
},
|
||
created() {
|
||
// #ifdef H5
|
||
this.stickyOffsetTop = this.offsetTop ? uni.upx2px(this.offsetTop) : 44;
|
||
// #endif
|
||
// #ifndef H5
|
||
this.stickyOffsetTop = this.offsetTop ? uni.upx2px(this.offsetTop) : 0;
|
||
// #endif
|
||
// 只能在created生命周期定义children，如果在data定义，会因为循环引用而报错
|
||
this.children = [];
|
||
},
|
||
data() {
|
||
return {
|
||
activeAnchorIndex: 0,
|
||
showSidebar: true,
|
||
// children: [],
|
||
touchmove: false,
|
||
touchmoveIndex: 0,
|
||
}
|
||
},
|
||
watch: {
|
||
scrollTop() {
|
||
this.updateData()
|
||
}
|
||
},
|
||
computed: {
|
||
// 弹出toast的z-index值
|
||
alertZIndex() {
|
||
return this.$u.zIndex.toast;
|
||
}
|
||
},
|
||
methods: {
|
||
updateData() {
|
||
this.timer && clearTimeout(this.timer);
|
||
this.timer = setTimeout(() => {
|
||
this.showSidebar = !!this.children.length;
|
||
this.setRect().then(() => {
|
||
this.onScroll();
|
||
});
|
||
}, 0);
|
||
},
|
||
setRect() {
|
||
return Promise.all([
|
||
this.setAnchorsRect(),
|
||
this.setListRect(),
|
||
this.setSiderbarRect()
|
||
]);
|
||
},
|
||
setAnchorsRect() {
|
||
return Promise.all(this.children.map((anchor, index) => anchor
|
||
.$uGetRect('.u-index-anchor-wrapper')
|
||
.then((rect) => {
|
||
Object.assign(anchor, {
|
||
height: rect.height,
|
||
top: rect.top
|
||
});
|
||
})));
|
||
},
|
||
setListRect() {
|
||
return this.$uGetRect('.u-index-bar').then((rect) => {
|
||
Object.assign(this, {
|
||
height: rect.height,
|
||
top: rect.top + this.scrollTop
|
||
});
|
||
});
|
||
},
|
||
setSiderbarRect() {
|
||
return this.$uGetRect('.u-index-bar__sidebar').then(rect => {
|
||
this.sidebar = {
|
||
height: rect.height,
|
||
top: rect.top
|
||
};
|
||
});
|
||
},
|
||
getActiveAnchorIndex() {
|
||
const {
|
||
children
|
||
} = this;
|
||
const {
|
||
sticky
|
||
} = this;
|
||
for (let i = this.children.length - 1; i >= 0; i--) {
|
||
const preAnchorHeight = i > 0 ? children[i - 1].height : 0;
|
||
const reachTop = sticky ? preAnchorHeight : 0;
|
||
if (reachTop >= children[i].top) {
|
||
return i;
|
||
}
|
||
}
|
||
return -1;
|
||
},
|
||
onScroll() {
|
||
const {
|
||
children = []
|
||
} = this;
|
||
if (!children.length) {
|
||
return;
|
||
}
|
||
const {
|
||
sticky,
|
||
stickyOffsetTop,
|
||
zIndex,
|
||
scrollTop,
|
||
activeColor
|
||
} = this;
|
||
const active = this.getActiveAnchorIndex();
|
||
this.activeAnchorIndex = active;
|
||
if (sticky) {
|
||
let isActiveAnchorSticky = false;
|
||
if (active !== -1) {
|
||
isActiveAnchorSticky =
|
||
children[active].top <= 0;
|
||
}
|
||
children.forEach((item, index) => {
|
||
if (index === active) {
|
||
let wrapperStyle = '';
|
||
let anchorStyle = {
|
||
color: `${activeColor}`
|
||
};
|
||
if (isActiveAnchorSticky) {
|
||
wrapperStyle = {
|
||
height: `${children[index].height}px`
|
||
};
|
||
anchorStyle = {
|
||
position: 'fixed',
|
||
top: `${stickyOffsetTop}px`,
|
||
zIndex: `${zIndex ? zIndex : this.$u.zIndex.indexListSticky}`,
|
||
color: `${activeColor}`
|
||
};
|
||
}
|
||
item.active = active;
|
||
item.wrapperStyle = wrapperStyle;
|
||
item.anchorStyle = anchorStyle;
|
||
} else if (index === active - 1) {
|
||
const currentAnchor = children[index];
|
||
const currentOffsetTop = currentAnchor.top;
|
||
const targetOffsetTop = index === children.length - 1 ?
|
||
this.top :
|
||
children[index + 1].top;
|
||
const parentOffsetHeight = targetOffsetTop - currentOffsetTop;
|
||
const translateY = parentOffsetHeight - currentAnchor.height;
|
||
const anchorStyle = {
|
||
position: 'relative',
|
||
transform: `translate3d(0, ${translateY}px, 0)`,
|
||
zIndex: `${zIndex ? zIndex : this.$u.zIndex.indexListSticky}`,
|
||
color: `${activeColor}`
|
||
};
|
||
item.active = active;
|
||
item.anchorStyle = anchorStyle;
|
||
} else {
|
||
item.active = false;
|
||
item.anchorStyle = '';
|
||
item.wrapperStyle = '';
|
||
}
|
||
});
|
||
}
|
||
},
|
||
onTouchMove(event) {
|
||
this.touchmove = true;
|
||
const sidebarLength = this.children.length;
|
||
const touch = event.touches[0];
|
||
const itemHeight = this.sidebar.height / sidebarLength;
|
||
let clientY = 0;
|
||
clientY = touch.clientY;
|
||
let index = Math.floor((clientY - this.sidebar.top) / itemHeight);
|
||
if (index < 0) {
|
||
index = 0;
|
||
} else if (index > sidebarLength - 1) {
|
||
index = sidebarLength - 1;
|
||
}
|
||
this.touchmoveIndex = index;
|
||
this.scrollToAnchor(index);
|
||
},
|
||
onTouchStop() {
|
||
this.touchmove = false;
|
||
this.scrollToAnchorIndex = null;
|
||
},
|
||
scrollToAnchor(index) {
|
||
if (this.scrollToAnchorIndex === index) {
|
||
return;
|
||
}
|
||
this.scrollToAnchorIndex = index;
|
||
const anchor = this.children.find((item) => item.index === this.indexList[index]);
|
||
if (anchor) {
|
||
this.$emit('select', anchor.index);
|
||
uni.pageScrollTo({
|
||
duration: 0,
|
||
scrollTop: anchor.top + this.scrollTop
|
||
});
|
||
}
|
||
}
|
||
}
|
||
};
|
||
</script>
|
||
|
||
<style lang="scss" scoped>
|
||
@import "../../libs/css/style.components.scss";
|
||
|
||
.u-index-bar {
|
||
position: relative
|
||
}
|
||
|
||
.u-index-bar__sidebar {
|
||
position: fixed;
|
||
top: 50%;
|
||
right: 0;
|
||
@include vue-flex;
|
||
flex-direction: column;
|
||
text-align: center;
|
||
transform: translateY(-50%);
|
||
user-select: none;
|
||
z-index: 99;
|
||
}
|
||
|
||
.u-index-bar__index {
|
||
font-weight: 500;
|
||
padding: 8rpx 18rpx;
|
||
font-size: 22rpx;
|
||
line-height: 1
|
||
}
|
||
|
||
.u-indexed-list-alert {
|
||
position: fixed;
|
||
width: 120rpx;
|
||
height: 120rpx;
|
||
right: 90rpx;
|
||
top: 50%;
|
||
margin-top: -60rpx;
|
||
border-radius: 24rpx;
|
||
font-size: 50rpx;
|
||
color: #fff;
|
||
background-color: rgba(0, 0, 0, 0.65);
|
||
@include vue-flex;
|
||
justify-content: center;
|
||
align-items: center;
|
||
padding: 0;
|
||
z-index: 9999999;
|
||
}
|
||
|
||
.u-indexed-list-alert text {
|
||
line-height: 50rpx;
|
||
}
|
||
</style>
|