<template>
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<view class="u-signature">
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<view class="u-signature__canvas-wrap" :style="{background: bgColor}">
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<up-canvas
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ref="signatureCanvas"
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:canvas-id="canvasId"
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:width="canvasWidth"
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:height="canvasHeight"
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:bg-color="bgColor"
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@touchstart="touchStart"
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@touchmove="touchMove"
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@touchend="touchEnd"
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:disable-scroll="true"
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class="u-signature__canvas"
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:style="{
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width: canvasWidth + 'px',
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height: canvasHeight + 'px',
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}">
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</up-canvas>
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</view>
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<view v-if="showToolbar" class="u-signature__toolbar">
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<view class="u-signature__toolbar-icons u-flex u-flex-x">
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<view class="u-signature__toolbar-icon" @click="undo">
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<up-icon name="arrow-left" size="22" :color="pathStack.length === 0 ? '#ccc' : '#999'"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="clear">
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<up-icon name="trash" size="25" color="#999"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="toggleBrushSettings">
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<up-icon name="edit-pen" size="25" color="#999"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="toggleColorSettings">
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<up-icon name="grid" size="24" color="#999"></up-icon>
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</view>
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<view class="u-signature__toolbar-icon" @click="exportSignature">
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<up-icon name="checkmark" size="25" :color="isEmpty ? '#ccc' : '#999'"></up-icon>
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</view>
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</view>
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<!-- 笔画设置 -->
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<view v-if="showBrushSettings" class="u-signature__brush-settings">
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<view class="u-signature__progress">
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<text class="u-signature__progress-label">{{ t("up.signature.penSize") }}:</text>
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<up-slider
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v-model="lineWidth"
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:min="1"
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:max="20"
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:step="1"
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@show-value="true"
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:value-show="(lineWidth)"
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></up-slider>
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</view>
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</view>
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<!-- 颜色设置 -->
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<view v-if="showColorSettings" class="u-signature__color-settings">
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<view class="u-signature__color-picker">
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<text class="u-signature__color-label">{{ t("up.signature.penColor") }}:</text>
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<view class="u-signature__colors">
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<view
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v-for="(color, index) in presetColors"
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:key="index"
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class="u-signature__color-item"
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:class="{'u-signature__color-item--active': lineColor === color}"
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:style="{ backgroundColor: color }"
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@click="selectColor(color)"
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></view>
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</view>
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</view>
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</view>
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</view>
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</view>
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</template>
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<script>
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import { t } from '../../libs/i18n'
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export default {
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name: 'u-signature',
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props: {
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// 画布宽度
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width: {
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type: [String, Number],
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default: 300
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},
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// 画布高度
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height: {
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type: [String, Number],
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default: 200
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},
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// 背景颜色
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bgColor: {
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type: String,
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default: '#ffffff'
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},
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// 默认笔画颜色
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color: {
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type: String,
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default: '#000000'
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},
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// 默认笔画粗细
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thickness: {
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type: [String, Number],
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default: 3
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},
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// 是否显示工具栏
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showToolbar: {
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type: Boolean,
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default: true
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}
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},
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data() {
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return {
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canvasId: 'u-signature-' + Math.random().toString(36).substr(2, 9),
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canvasWidth: 300,
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canvasHeight: 200,
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lineColor: '#000000',
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lineWidth: 3,
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isDrawing: false,
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pathStack: [], // 存储绘制路径用于回退
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currentPath: [], // 当前绘制路径
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isEmpty: true,
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presetColors: [
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'#000000', // 黑色
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'#ff0000', // 红色
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'#00ff00', // 绿色
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'#0000ff', // 蓝色
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'#ffff00', // 黄色
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'#00ffff', // 青色
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'#ff00ff', // 紫色
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'#ffffff' // 白色
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],
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showBrushSettings: false,
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showColorSettings: false,
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lastPoint: null, // 保存上一个点的坐标
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canvasInstance: null // 缓存canvas实例
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}
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},
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mounted() {
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// 初始化时获取canvas实例
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this.$nextTick(() => {
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this.getCanvasInstance();
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this.clearCanvas();
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});
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},
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watch: {
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width: {
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handler(newVal) {
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this.canvasWidth = Number(newVal)
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},
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immediate: true
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},
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height: {
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handler(newVal) {
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this.canvasHeight = Number(newVal)
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},
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immediate: true
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},
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color: {
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handler(newVal) {
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this.lineColor = newVal
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},
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immediate: true
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},
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thickness: {
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handler(newVal) {
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this.lineWidth = Number(newVal)
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},
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immediate: true
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}
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},
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methods: {
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t,
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// 获取签名画布实例
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getCanvasInstance() {
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if (this.canvasInstance) {
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return this.canvasInstance;
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}
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const canvasRef = this.$refs.signatureCanvas;
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if (canvasRef) {
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this.canvasInstance = canvasRef;
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return canvasRef;
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}
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return null;
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},
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touchStart(e) {
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if (!this.canvasInstance || !this.canvasInstance.ctx) {
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this.getCanvasInstance();
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}
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if (!this.canvasInstance || !this.canvasInstance.ctx) return;
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this.isDrawing = true;
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this.isEmpty = false;
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this.currentPath = [];
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const { x, y } = this.getCanvasPoint(e);
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// 设置线条样式
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this.canvasInstance.setLineStyle(this.lineColor, this.lineWidth);
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// 开始路径
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this.canvasInstance.beginPath();
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this.canvasInstance.moveTo(x, y);
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// 记录起始点
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this.currentPath.push({
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x,
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y,
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type: 'start',
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color: this.lineColor,
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width: this.lineWidth
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});
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// 保存上一个点
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this.lastPoint = { x, y };
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// 阻止默认事件以提高性能
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e.preventDefault();
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},
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touchMove(e) {
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if (!this.isDrawing || !this.canvasInstance || !this.canvasInstance.ctx) return;
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// 阻止默认事件以提高性能
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e.preventDefault();
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const { x, y } = this.getCanvasPoint(e);
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// 从上一个点画线到当前点
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this.canvasInstance.lineTo(x, y);
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this.canvasInstance.stroke(); // 实时绘制当前线段
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this.currentPath.push({
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x,
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y,
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type: 'move'
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});
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this.canvasInstance.draw(false);
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// 更新上一个点
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this.lastPoint = { x, y };
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},
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touchEnd(e) {
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if (!this.isDrawing || !this.canvasInstance || !this.canvasInstance.ctx) return;
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this.isDrawing = false;
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this.canvasInstance.closePath();
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this.lastPoint = null;
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// 将当前路径加入栈中用于回退
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if (this.currentPath.length > 0) {
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this.pathStack.push([...this.currentPath]);
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}
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// 最后统一执行一次绘制
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this.canvasInstance.draw(true);
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},
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// 同步获取canvas坐标点（兼容处理）
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getCanvasPoint(e) {
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// #ifdef MP-WEIXIN
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const touch = e.touches && e.touches[0] ? e.touches[0] : e.mp.touches[0];
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// #endif
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// #ifndef MP-WEIXIN
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const touch = e.touches[0];
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// #endif
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// 计算相对于canvas的坐标
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// 由于无法直接获取canvas位置，这里简化处理
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// 实际应用中可能需要通过uni.createSelectorQuery获取canvas位置
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return {
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x: touch.x,
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y: touch.y
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};
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},
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// 选择颜色
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selectColor(color) {
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this.lineColor = color
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},
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// 回退操作
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undo() {
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if (this.pathStack.length === 0) return
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// 弹出最后一个路径
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this.pathStack.pop()
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// 重新绘制
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this.redraw()
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},
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// 重新绘制所有路径
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redraw() {
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if (!this.canvasInstance) {
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this.getCanvasInstance();
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}
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if (!this.canvasInstance) return;
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// 先清空画布
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this.canvasInstance.clearCanvas();
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if (this.pathStack.length === 0) {
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this.isEmpty = true;
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return;
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}
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this.isEmpty = false;
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// 逐个绘制路径
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this.pathStack.forEach(path => {
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if (path.length === 0) return;
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this.canvasInstance.beginPath();
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let lastPoint = null;
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path.forEach((point, index) => {
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if (index === 0 && point.type === 'start') {
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// 设置线条样式
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this.canvasInstance.setLineStyle(point.color, point.width);
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this.canvasInstance.moveTo(point.x, point.y);
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lastPoint = { x: point.x, y: point.y };
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} else if (point.type === 'move') {
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this.canvasInstance.lineTo(point.x, point.y);
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lastPoint = { x: point.x, y: point.y };
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}
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});
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this.canvasInstance.stroke();
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this.canvasInstance.draw(true);
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});
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},
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// 清空画布内容
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clearCanvas() {
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if (!this.canvasInstance) {
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this.getCanvasInstance();
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}
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if (!this.canvasInstance) return;
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this.canvasInstance.clearCanvas();
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},
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// 导出签名图片
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async exportSignature() {
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if (this.isEmpty) {
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console.warn('签名为空，无法导出');
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return;
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}
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if (!this.canvasInstance) {
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this.getCanvasInstance();
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}
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if (!this.canvasInstance) {
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console.error('无法获取画布实例');
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return;
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}
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try {
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// 先重绘整个签名内容
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this.redraw();
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// 导出图片
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const imagePath = await this.canvasInstance.exportImage('png', 1);
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this.$emit('confirm', imagePath);
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} catch (error) {
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console.error('导出签名图片失败:', error);
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this.$emit('error', error);
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}
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},
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// 切换笔画设置显示
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toggleBrushSettings() {
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this.showBrushSettings = !this.showBrushSettings;
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if (this.showBrushSettings) {
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this.showColorSettings = false;
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}
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},
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// 切换颜色设置显示
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toggleColorSettings() {
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this.showColorSettings = !this.showColorSettings;
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if (this.showColorSettings) {
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this.showBrushSettings = false;
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}
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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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.u-signature {
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display: flex;
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flex-direction: column;
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&__canvas-wrap {
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border: 1px solid #e0e0e0;
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border-radius: 4px;
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overflow: hidden;
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}
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&__canvas {
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width: 100%;
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height: 100%;
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}
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&__toolbar {
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margin-top: 5px;
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background-color: #fff;
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}
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&__toolbar-icons {
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display: flex;
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justify-content: space-between;
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align-items: center;
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padding: 1px 0;
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// border: 1px solid #e0e0e0;
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border-radius: 4px;
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}
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&__toolbar-icon {
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padding: 5px;
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}
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&__brush-settings,
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&__color-settings {
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margin-top: 15px;
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padding: 1px;
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// border: 1px solid #e0e0e0;
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border-radius: 4px;
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}
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&__progress {
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&-label {
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display: block;
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margin-bottom: 10px;
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font-size: 14px;
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color: #999;
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}
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}
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&__color-picker {
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margin-bottom: 10px;
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}
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&__color-label {
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display: block;
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margin-bottom: 10px;
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font-size: 14px;
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color: #999;
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}
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&__colors {
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display: flex;
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flex-direction: row;
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flex-wrap: wrap;
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gap: 10px;
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}
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&__color-item {
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width: 30px;
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height: 30px;
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border-radius: 50%;
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border: 2px solid #f0f0f0;
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cursor: pointer;
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&--active {
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border-color: #2979ff;
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transform: scale(1.1);
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}
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}
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&__actions {
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display: flex;
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flex-direction: row;
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gap: 10px;
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justify-content: center;
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}
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}
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</style>
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