216 lines
7.2 KiB
Vue
216 lines
7.2 KiB
Vue
<template>
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<view class="u-circle-progress" :style="{
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...progressStyle,
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backgroundColor: bgColor
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}">
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<!-- 支付宝小程序不支持canvas-id属性,必须用id属性 -->
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<!-- #ifndef APP-NVUE -->
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<canvas class="u-canvas-bg" :canvas-id="elBgId" :id="elBgId" :style="progressStyle"></canvas>
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<canvas class="u-canvas" :canvas-id="elId" :id="elId" :style="progressStyle"></canvas>
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<!-- #endif -->
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<!-- #ifdef APP-NVUE -->
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<gcanvas class="u-canvas-bg" :ref="elBgId" :style="progressStyle"></gcanvas>
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<gcanvas class="u-canvas" :ref="elId" :style="progressStyle"></gcanvas>
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<!-- #endif -->
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<slot></slot>
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</view>
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</template>
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<script>
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import props from './props.js'
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import mixin from '../../libs/mixin/mixin'
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import mpMixin from '../../libs/mixin/mpMixin'
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// #ifdef APP-NVUE
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import { enable, WeexBridge } from '../../libs/gcanvas/index.js';
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// #endif
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/**
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* circleProgress 环形进度条
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* @description 展示操作或任务的当前进度,比如上传文件,是一个圆形的进度条。注意:此组件的percent值只能动态增加,不能动态减少。
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* @tutorial https://uview.d3u.cn/components/circleProgress.html
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* @property {String Number} percent 圆环进度百分比值,为数值类型,0-100
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* @property {String} inactive-color 圆环的底色,默认为灰色(该值无法动态变更)(默认#ececec)
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* @property {String} active-color 圆环激活部分的颜色(该值无法动态变更)(默认#19be6b)
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* @property {String Number} width 整个圆环组件的宽度,高度默认等于宽度值,单位rpx(默认200)
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* @property {String Number} border-width 圆环的边框宽度,单位rpx(默认14)
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* @property {String Number} duration 整个圆环执行一圈的时间,单位ms(默认呢1500)
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* @property {String} type 如设置,active-color值将会失效
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* @property {String} bg-color 整个组件背景颜色,默认为白色
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* @example <u-circle-progress active-color="#2979ff" :percent="80"></u-circle-progress>
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*/
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export default {
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name: 'u-circle-progress',
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mixins: [mpMixin, mixin, props],
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data() {
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return {
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// #ifdef MP-WEIXIN
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elBgId: 'uCircleProgressBgId', // 微信小程序中不能使用this.$u.guid()形式动态生成id值,否则会报错
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elId: 'uCircleProgressElId',
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// #endif
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// #ifndef MP-WEIXIN
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elBgId: uni.$u.guid(), // 非微信端的时候,需用动态的id,否则一个页面多个圆形进度条组件数据会混乱
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elId: uni.$u.guid(),
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// #endif
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widthPx: this.width, // 转成px后的整个组件的背景宽度
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borderWidthPx:this.borderWidth, // 转成px后的圆环的宽度
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startAngle: -Math.PI / 2, // canvas画圆的起始角度,默认为3点钟方向,定位到12点钟方向
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progressContext: null, // 活动圆的canvas上下文
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newPercent: 0, // 当动态修改进度值的时候,保存进度值的变化前后值,用于比较用
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oldPercent: 0 // 当动态修改进度值的时候,保存进度值的变化前后值,用于比较用
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};
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},
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watch: {
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percent(nVal, oVal = 0) {
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if (nVal > 100) nVal = 100;
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if (nVal < 0) oVal = 0;
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// 此值其实等于this.percent,命名一个新
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this.newPercent = nVal;
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this.oldPercent = oVal;
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setTimeout(() => {
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// 无论是百分比值增加还是减少,需要操作还是原来的旧的百分比值
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// 将此值减少或者新增到新的百分比值
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this.drawCircleByProgress(oVal);
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}, 50);
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}
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},
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created() {
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// 赋值,用于加载后第一个画圆使用
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this.newPercent = this.percent;
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this.oldPercent = 0;
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},
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computed: {
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// 有type主题时,优先起作用
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circleColor() {
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if (['success', 'error', 'info', 'primary', 'warning'].indexOf(this.type) >= 0){
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return this.$u.theme[this.type];
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}else{
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return this.activeColor;
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}
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},
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progressStyle() {
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return {
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width: uni.$u.addUnit(this.widthPx),
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height: uni.$u.addUnit(this.widthPx),
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}
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},
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},
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mounted() {
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this.$nextTick(() => {
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setTimeout(() => {
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this.drawProgressBg();
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this.drawCircleByProgress(this.oldPercent);
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}, 100)
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})
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},
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methods: {
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drawProgressBg() {
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// #ifdef APP-NVUE
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let ganvas = this.$refs[this.elBgId];
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let canvasObj = enable(ganvas, {bridge: WeexBridge});
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let ctx = canvasObj.getContext('2d');
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// #endif
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// #ifndef APP-NVUE
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// #ifdef MP-ALIPAY
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let ctx = uni.createCanvasContext(this.elBgId);
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// #endif
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// #ifndef MP-ALIPAY
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let ctx = uni.createCanvasContext(this.elBgId, this);
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// #endif
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// #endif
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ctx.setLineWidth(this.borderWidthPx); // 设置圆环宽度
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ctx.setStrokeStyle(this.inactiveColor); // 线条颜色
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ctx.beginPath(); // 开始描绘路径
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// 设置一个原点(110,110),半径为100的圆的路径到当前路径
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let radius = this.widthPx / 2;
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ctx.arc(radius, radius, radius - this.borderWidthPx, 0, 2 * Math.PI, false);
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ctx.stroke(); // 对路径进行描绘
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ctx.draw()
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},
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drawCircleByProgress(progress) {
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// 第一次操作进度环时将上下文保存到了this.data中,直接使用即可
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let ctx = this.progressContext;
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if (!ctx) {
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// #ifdef APP-NVUE
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let ganvas = this.$refs[this.elId];
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let canvasObj = enable(ganvas, {bridge: WeexBridge});
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ctx = canvasObj.getContext('2d');
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// #endif
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// #ifndef APP-NVUE
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// #ifdef MP-ALIPAY
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ctx = uni.createCanvasContext(this.elId);
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// #endif
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// #ifndef MP-ALIPAY
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ctx = uni.createCanvasContext(this.elId, this);
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// #endif
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// #endif
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this.progressContext = ctx;
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}
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// 表示进度的两端为圆形
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ctx.setLineCap('round');
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// 设置线条的宽度和颜色
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ctx.setLineWidth(this.borderWidthPx);
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ctx.setStrokeStyle(this.circleColor);
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// 将总过渡时间除以100,得出每修改百分之一进度所需的时间
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let time = Math.floor(this.duration / 100);
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// 结束角的计算依据为:将2π分为100份,乘以当前的进度值,得出终止点的弧度值,加起始角,为整个圆从默认的
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// 3点钟方向开始画图,转为更好理解的12点钟方向开始作图,这需要起始角和终止角同时加上this.startAngle值
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let endAngle = ((2 * Math.PI) / 100) * progress + this.startAngle;
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ctx.beginPath();
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// 半径为整个canvas宽度的一半
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let radius = this.widthPx / 2;
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ctx.arc(radius, radius, radius - this.borderWidthPx, this.startAngle, endAngle, false);
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ctx.stroke();
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ctx.draw();
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// 如果变更后新值大于旧值,意味着增大了百分比
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if (this.newPercent > this.oldPercent) {
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// 每次递增百分之一
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progress++;
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// 如果新增后的值,大于需要设置的值百分比值,停止继续增加
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if (progress > this.newPercent) return;
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} else {
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// 同理于上面
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progress--;
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if (progress < this.newPercent) return;
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}
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setTimeout(() => {
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// 定时器,每次操作间隔为time值,为了让进度条有动画效果
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this.drawCircleByProgress(progress);
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}, time);
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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/components.scss";
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.u-circle-progress {
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position: relative;
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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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justify-content: center;
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}
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.u-canvas-bg {
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position: absolute;
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}
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.u-canvas {
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position: absolute;
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}
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</style> |