300 lines
10 KiB
Vue
300 lines
10 KiB
Vue
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<template>
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<view
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class="u-circle-progress"
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:class="customClass"
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:style="
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$u.toStyle(
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{
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width: widthPx + 'px',
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height: widthPx + 'px',
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backgroundColor: bgColor
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},
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customStyle
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)
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"
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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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<!-- #ifdef MP-WEIXIN || MP-TOUTIAO -->
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<canvas
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class="u-canvas-bg"
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type="2d"
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:canvas-id="elBgId"
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:id="elBgId"
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:style="{
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width: widthPx + 'px',
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height: widthPx + 'px'
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}"
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></canvas>
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<canvas
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class="u-canvas"
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type="2d"
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:canvas-id="elId"
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:id="elId"
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:style="{
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width: widthPx + 'px',
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height: widthPx + 'px'
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}"
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></canvas>
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<!-- #endif -->
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<!-- #ifndef MP-WEIXIN || MP-TOUTIAO -->
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<canvas
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class="u-canvas-bg"
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:canvas-id="elBgId"
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:id="elBgId"
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:style="{
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width: widthPx + 'px',
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height: widthPx + 'px'
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}"
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></canvas>
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<canvas
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class="u-canvas"
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:canvas-id="elId"
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:id="elId"
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:style="{
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width: widthPx + 'px',
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height: widthPx + 'px'
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}"
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></canvas>
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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 lang="ts">
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export default {
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name: 'u-circle-progress',
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options: {
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addGlobalClass: true,
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// #ifndef MP-TOUTIAO
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virtualHost: true,
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// #endif
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styleIsolation: 'shared'
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}
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};
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</script>
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<script setup lang="ts">
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import { ref, computed, watch, onMounted, getCurrentInstance, onBeforeMount } from 'vue';
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import { $u } from '../..';
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import { CircleProgressProps } from './types';
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// #ifdef MP-WEIXIN || MP-TOUTIAO
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import { canvas2d } from '../../libs/util/canvas-2d';
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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://uviewpro.cn/zh/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var(--u-divider-color)）
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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var(--u-type-success)）
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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="var(--u-type-primary)" :percent="80"></u-circle-progress>
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*/
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const props = defineProps(CircleProgressProps);
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let elBgId = $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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let elId = $u.guid();
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// #ifdef MP-WEIXIN || MP-TOUTIAO
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// elBgId = 'uCircleProgressBgId'; // 微信小程序中不能使用$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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const instance = getCurrentInstance();
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const pixelRatio = ref<number>(1); // 像素比
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// 存储 MP-WEIXIN 下通过 selectorQuery 获取到的 canvas node，方便在绘制前清空
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const canvasNodeMap = new Map<string, any>();
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const widthPx = computed(() =>
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typeof uni !== 'undefined' && uni.upx2px ? uni.upx2px(Number(props.width)) : Number(props.width)
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);
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const borderWidthPx = computed(() =>
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typeof uni !== 'undefined' && uni.upx2px ? uni.upx2px(Number(props.borderWidth)) : Number(props.borderWidth)
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);
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const 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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const progressContext = ref<any>(null); // 活动圆的canvas上下文
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const newPercent = ref(props.percent); // 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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const oldPercent = ref(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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* 有type主题时，优先起作用
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*/
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const circleColor = computed(() => {
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if (props.type && ['success', 'error', 'info', 'primary', 'warning'].includes(props.type)) {
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return $u.color[props.type as keyof typeof $u.color] as string;
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}
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return props.activeColor;
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});
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onBeforeMount(() => {
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pixelRatio.value = uni.getSystemInfoSync().pixelRatio;
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});
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// 监听percent变化，动态绘制进度
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watch(
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() => props.percent,
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(nVal, oVal = 0) => {
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let next = nVal > 100 ? 100 : nVal;
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let prev = oVal < 0 ? 0 : oVal;
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newPercent.value = next;
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oldPercent.value = prev;
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setTimeout(() => {
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// 无论是百分比值增加还是减少，需要操作还是原来的旧的百分比值
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// 将此值减少或者新增到新的百分比值
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drawCircleByProgress(prev);
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}, 50);
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}
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);
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onMounted(() => {
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// 赋值，用于加载后第一个画圆使用
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newPercent.value = props.percent;
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oldPercent.value = 0;
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// 在h5端，必须要做一点延时才起作用，this.$nextTick()无效(HX2.4.7)
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setTimeout(() => {
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drawProgressBg();
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drawCircleByProgress(oldPercent.value);
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}, 50);
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});
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/**
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* 获取canvas上下文
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*/
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function getContext(canvasId: any) {
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return new Promise<UniApp.CanvasContext>(resolve => {
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let ctx = null;
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// #ifndef MP-WEIXIN || MP-TOUTIAO
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ctx = uni.createCanvasContext(canvasId, instance);
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resolve(ctx);
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// #endif
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// #ifdef MP-WEIXIN || MP-TOUTIAO
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uni.createSelectorQuery()
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.in(instance?.proxy)
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.select(`#${canvasId}`)
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.node(res => {
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if (res && res.node) {
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const canvas = res.node;
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ctx = canvas2d(canvas.getContext('2d') as CanvasRenderingContext2D);
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canvas.width = widthPx.value * pixelRatio.value;
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canvas.height = widthPx.value * pixelRatio.value;
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ctx.scale(pixelRatio.value, pixelRatio.value);
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// 存储 canvas node，后续绘制时用于清空画布
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canvasNodeMap.set(canvasId, canvas);
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resolve(ctx);
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}
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})
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.exec();
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// #endif
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});
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}
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/**
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* 绘制底部灰色圆环
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*/
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async function drawProgressBg() {
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const ctx = await getContext(elBgId);
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// #ifdef MP-WEIXIN || MP-TOUTIAO
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// 清空背景画布（如果可用）以确保绘制一致性
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try {
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if (typeof ctx.clearRect === 'function') {
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const node = canvasNodeMap.get(elBgId);
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const w = node ? node.width : widthPx.value * pixelRatio.value;
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const h = node ? node.height : widthPx.value * pixelRatio.value;
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ctx.clearRect(0, 0, w, h);
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}
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} catch (e) {
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// ignore
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}
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// #endif
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ctx.setLineWidth(borderWidthPx.value); // 设置圆环宽度
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ctx.setStrokeStyle(props.inactiveColor); // 线条颜色
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ctx.beginPath(); // 开始描绘路径
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const radius = widthPx.value / 2; // 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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ctx.arc(radius, radius, radius - borderWidthPx.value, 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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/**
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* 绘制进度圆环
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* @param progress 当前进度
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*/
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async function drawCircleByProgress(progress: number) {
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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 = progressContext.value;
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if (!ctx) {
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ctx = await getContext(elId);
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progressContext.value = ctx;
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}
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// #ifdef MP-WEIXIN || MP-TOUTIAO
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// 清空进度画布，避免旧的更大进度残留，导致无法降低的视觉错误
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try {
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if (typeof ctx.clearRect === 'function') {
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const node = canvasNodeMap.get(elId);
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const w = node ? node.width : widthPx.value * pixelRatio.value;
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const h = node ? node.height : widthPx.value * pixelRatio.value;
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ctx.clearRect(0, 0, w, h);
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}
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} catch (e) {
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// ignore
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}
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// #endif
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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(borderWidthPx.value);
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ctx.setStrokeStyle(circleColor.value);
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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(Number(props.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 + 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 = widthPx.value / 2;
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ctx.arc(radius, radius, radius - borderWidthPx.value, 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 (newPercent.value > oldPercent.value) {
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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 > newPercent.value) 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 < newPercent.value) 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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drawCircleByProgress(progress);
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}, time);
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}
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</script>
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<style lang="scss" scoped>
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@import '../../libs/css/style.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>
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