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461 lines
12 KiB
461 lines
12 KiB
<template>
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<view class="lime-signature" v-if="show" :style="[canvasStyle, styles]" ref="limeSignature">
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<!-- #ifndef APP-VUE || APP-NVUE -->
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<canvas v-if="useCanvas2d" class="lime-signature__canvas" :id="canvasId" type="2d"
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:disableScroll="disableScroll" @touchstart="touchStart" @touchmove="touchMove"
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@touchend="touchEnd"></canvas>
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<canvas v-else :disableScroll="disableScroll" class="lime-signature__canvas" :canvas-id="canvasId"
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:id="canvasId" :width="canvasWidth" :height="canvasHeight" @touchstart="touchStart" @touchmove="touchMove"
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@touchend="touchEnd" @mousedown="touchStart" @mousemove="touchMove" @mouseup="touchEnd"></canvas>
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<canvas class="offscreen" canvas-id="offscreen" id="offscreen"
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:style="'width:' + offscreenSize[0] + 'px;height:' + offscreenSize[1] + 'px'" :width="offscreenSize[0]"
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:height="offscreenSize[1]">
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</canvas>
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<!-- #endif -->
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<!-- #ifdef APP-VUE -->
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<view :id="canvasId" :disableScroll="disableScroll" :rparam="param" :change:rparam="sign.update"
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:rclear="rclear" :change:rclear="sign.clear" :rundo="rundo" :change:rundo="sign.undo" :rsave="rsave"
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:change:rsave="sign.save" :rempty="rempty" :change:rempty="sign.isEmpty"></view>
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<!-- #endif -->
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<!-- #ifdef APP-NVUE -->
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<web-view src="/uni_modules/lime-signature/hybrid/html/index.html" class="lime-signature__canvas" ref="webview"
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@pagefinish="onPageFinish" @error="onError" @onPostMessage="onMessage"></web-view>
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<!-- #endif -->
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</view>
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</template>
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<script>
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// #ifndef APP-NVUE
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import { canIUseCanvas2d, wrapEvent, requestAnimationFrame, sleep } from './utils'
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import {Signature} from './signature'
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// import {Signature} from '@signature';
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import { uniContext, createImage, toDataURL } from './context'
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// #endif
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import props from './props';
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import { base64ToPath, getRect } from './utils'
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/**
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* LimeSignature 手写板签名
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* @description 手写板签名插件：一款能跑在uniapp各端中的签名插件，支持横屏、背景色、笔画颜色、笔画大小等功能,可生成有内容的区域，减小图片尺寸，节省空间。
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* @tutorial https://ext.dcloud.net.cn/plugin?id=4354
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* @property {Number} penSize 画笔大小
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* @property {Number} minLineWidth 线条最小宽
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* @property {Number} maxLineWidth 线条最大宽
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* @property {String} penColor 画笔颜色
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* @property {String} backgroundColor 背景颜色,不填则为透明
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* @property {type} 指定 canvas 类型
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* @value 2d canvas 2d
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* @value '' 非 canvas 2d 旧接口，微信不再维护
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* @property {Boolean} openSmooth 模拟笔锋
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* @property {Number} beforeDelay 延时初始化，在放在弹窗里可以使用 （毫秒）
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* @property {Number} maxHistoryLength 限制历史记录数，即最大可撤销数，传入0则关闭历史记录功能
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* @property {Boolean} landscape 横屏，使用后在最后生成图片时会图片旋转90度
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* @property {Boolean} disableScroll 当在写字时，禁止屏幕滚动以及下拉刷新，nvue无效
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* @property {Boolean} boundingBox 只生成内容区域，即未画部分不生成，有性能的损耗
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*/
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export default {
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props,
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data() {
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return {
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canvasWidth: null,
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canvasHeight: null,
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offscreenWidth: null,
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offscreenHeight: null,
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useCanvas2d: true,
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show: true,
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offscreenStyles: '',
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// #ifdef APP-PLUS
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rclear: 0,
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rundo: 0,
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rsave: JSON.stringify({
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n: 0,
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fileType: 'png',
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quality: 1
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}),
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rempty: 0,
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risEmpty: true,
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toDataURL: null,
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tempFilePath: [],
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// #endif
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}
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},
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computed: {
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canvasId() {
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// #ifdef VUE2
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return `lime-signature${this._uid}`
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// #endif
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// #ifdef VUE3
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return `lime-signature${this._.uid}`
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// #endif
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},
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offscreenId() {
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return this.canvasId + 'offscreen'
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},
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offscreenSize() {
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const {
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offscreenWidth,
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offscreenHeight
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} = this
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return this.landscape ? [offscreenHeight, offscreenWidth] : [offscreenWidth, offscreenHeight]
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},
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canvasStyle() {
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const {
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canvasWidth,
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canvasHeight,
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backgroundColor
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} = this
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return {
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width: canvasWidth && (canvasWidth + 'px'),
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height: canvasHeight && (canvasHeight + 'px'),
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background: backgroundColor
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}
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},
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param() {
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const {
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penColor,
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penSize,
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backgroundColor,
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landscape,
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boundingBox,
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openSmooth,
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minLineWidth,
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maxLineWidth,
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minSpeed,
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maxWidthDiffRate,
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maxHistoryLength,
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disableScroll
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} = this
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return JSON.parse(JSON.stringify({
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penColor,
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penSize,
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backgroundColor,
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landscape,
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boundingBox,
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openSmooth,
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minLineWidth,
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maxLineWidth,
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minSpeed,
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maxWidthDiffRate,
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maxHistoryLength,
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disableScroll
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}))
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}
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},
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// #ifdef APP-NVUE
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watch: {
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param(v) {
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this.$refs.webview.evalJS(`update(${JSON.stringify(v)})`)
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}
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},
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// #endif
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// #ifndef APP-PLUS
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created() {
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this.useCanvas2d = this.type == '2d' && canIUseCanvas2d()
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},
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// #endif
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// #ifndef APP-PLUS
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async mounted() {
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if (this.beforeDelay) {
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await sleep(this.beforeDelay)
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}
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const config = await this.getContext()
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this.signature = new Signature(config)
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this.canvasEl = this.signature.canvas.get('el')
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this.offscreenWidth = this.canvasWidth = this.signature.canvas.get('width')
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this.offscreenHeight = this.canvasHeight = this.signature.canvas.get('height')
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this.stopWatch = this.$watch('param', (v) => {
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this.signature.pen.setOption(v)
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}, {
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immediate: true
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})
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},
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// #endif
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// #ifndef APP-PLUS
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// #ifdef VUE3
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beforeUnmount() {
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this.stopWatch && this.stopWatch()
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this.signature.destroy()
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this.signature = null
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this.show = false;
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},
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// #endif
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// #ifdef VUE2
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beforeDestroy() {
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this.stopWatch && this.stopWatch()
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this.signature.destroy()
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this.show = false;
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this.signature = null
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},
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// #endif
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// #endif
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methods: {
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// #ifdef MP-QQ
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// toJSON() { return this },
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// #endif
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// #ifdef APP-PLUS
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onPageFinish() {
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this.$refs.webview.evalJS(`update(${JSON.stringify(this.param)})`)
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},
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onMessage(e = {}) {
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const {
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detail: {
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data: [res]
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}
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} = e
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if (res.event?.save) {
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this.toDataURL = res.event.save
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}
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if (res.event?.changeSize) {
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const {
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width,
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height
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} = res.event.changeSize
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}
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if (res.event.hasOwnProperty('isEmpty')) {
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this.risEmpty = res.event.isEmpty
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}
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if (res.event?.file) {
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this.tempFilePath.push(res.event.file)
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if (this.tempFilePath.length > 7) {
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this.tempFilePath.shift()
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}
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return
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}
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if (res.event?.success) {
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if (res.event.success) {
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this.tempFilePath.push(res.event.success)
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if (this.tempFilePath.length > 8) {
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this.tempFilePath.shift()
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}
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this.toDataURL = this.tempFilePath.join('')
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this.tempFilePath = []
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} else {
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this.$emit('fail', 'canvas no data')
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}
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return
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}
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},
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// #endif
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undo() {
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// #ifdef APP-VUE || APP-NVUE
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this.rundo += 1
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// #endif
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// #ifdef APP-NVUE
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this.$refs.webview.evalJS(`undo()`)
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// #endif
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// #ifndef APP-VUE
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if (this.signature)
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this.signature.undo()
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// #endif
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},
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clear() {
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// #ifdef APP-VUE || APP-NVUE
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this.rclear += 1
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// #endif
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// #ifdef APP-NVUE
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this.$refs.webview.evalJS(`clear()`)
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// #endif
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// #ifndef APP-VUE
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if (this.signature)
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this.signature.clear()
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// #endif
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},
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isEmpty() {
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// #ifdef APP-NVUE
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this.$refs.webview.evalJS(`isEmpty()`)
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// #endif
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// #ifdef APP-VUE || APP-NVUE
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this.rempty += 1
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// #endif
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// #ifndef APP-VUE || APP-NVUE
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return this.signature.isEmpty()
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// #endif
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},
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canvasToTempFilePath(param) {
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const isEmpty = this.isEmpty()
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// #ifdef APP-NVUE
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this.$refs.webview.evalJS(`save()`)
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// #endif
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// #ifdef APP-VUE || APP-NVUE
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const stopURLWatch = this.$watch('toDataURL', (v, n) => {
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if (v && v !== n) {
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// if(param.pathType == 'url') {
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base64ToPath(v).then(res => {
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param.success({
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tempFilePath: res,
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isEmpty: this.risEmpty
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})
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})
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// } else {
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// param.success({tempFilePath: v,isEmpty: this.risEmpty })
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// }
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this.toDataURL = ''
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}
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stopURLWatch && stopURLWatch()
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})
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const {
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fileType,
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quality
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} = param
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const rsave = JSON.parse(this.rsave)
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rsave.n++
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rsave.fileType = fileType
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rsave.quality = quality
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this.rsave = JSON.stringify(rsave)
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// #endif
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// #ifndef APP-VUE || APP-NVUE
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const success = (success) => param.success && param.success(success)
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const fail = (err) => param.fail && param.fail(err)
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const {
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canvas
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} = this.signature.canvas.get('el')
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const {
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backgroundColor,
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landscape,
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boundingBox
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} = this
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let width = this.signature.canvas.get('width')
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let height = this.signature.canvas.get('height')
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let x = 0
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let y = 0
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const canvasToTempFilePath = (image) => {
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const context = uni.createCanvasContext('offscreen', this)
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context.save()
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context.setTransform(1, 0, 0, 1, 0, 0)
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if (landscape) {
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context.translate(0, width)
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context.rotate(-Math.PI / 2)
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}
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if (backgroundColor) {
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context.fillStyle = backgroundColor
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context.fillRect(0, 0, width, height)
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}
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context.drawImage(image, 0, 0, width, height);
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context.draw(false, () => {
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toDataURL('offscreen', this, param).then((res) => {
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const size = Math.max(width, height)
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context.restore()
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context.clearRect(0, 0, size, size)
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success({
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tempFilePath: res,
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isEmpty
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})
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})
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})
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}
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const next = () => {
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const param = {
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x,
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y,
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width,
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height,
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canvas: this.useCanvas2d ? canvas : null
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}
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toDataURL(this.canvasId, this, param).then(canvasToTempFilePath).catch(fail)
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}
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if (boundingBox) {
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this.signature.getContentBoundingBox(async res => {
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this.offscreenWidth = width = res.width
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this.offscreenHeight = height = res.height
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x = res.startX
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y = res.startY
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await sleep(100)
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next()
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})
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} else {
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next()
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}
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// #endif
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},
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// #ifndef APP-PLUS
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getContext() {
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return getRect(`#${this.canvasId}`, {
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context: this,
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type: this.useCanvas2d ? 'fields' : 'boundingClientRect'
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}).then(res => {
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if (res) {
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let {
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width,
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height,
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node: canvas,
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left,
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top,
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right
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} = res
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let {
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pixelRatio
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} = uni.getSystemInfoSync()
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let context;
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if (canvas) {
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context = canvas.getContext('2d')
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canvas.width = width * pixelRatio;
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canvas.height = height * pixelRatio;
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} else {
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pixelRatio = 1
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context = uniContext(this.canvasId, this)
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canvas = {
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createImage,
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toDataURL: () => toDataURL(this.canvasId, this),
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requestAnimationFrame
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}
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}
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// 支付宝小程序 使用stroke有个默认背景色
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context.clearRect(0, 0, width, height)
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return {
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left,
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top,
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right,
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width,
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height,
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context,
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canvas,
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pixelRatio
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};
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}
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})
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},
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touchStart(e) {
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if (!this.canvasEl) return
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this.isStart = true
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this.canvasEl.dispatchEvent('touchstart', wrapEvent(e))
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},
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touchMove(e) {
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if (!this.canvasEl || !this.isStart && this.canvasEl) return
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this.canvasEl.dispatchEvent('touchmove', wrapEvent(e))
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},
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touchEnd(e) {
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if (!this.canvasEl) return
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this.isStart = false
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this.canvasEl.dispatchEvent('touchend', wrapEvent(e))
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},
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// #endif
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}
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}
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</script>
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<!-- #ifdef APP-VUE -->
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<script module="sign" lang="renderjs">
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import sign from './render'
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export default sign
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</script>
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<!-- #endif -->
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<style lang="scss">
|
|
.lime-signature,
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.lime-signature__canvas {
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/* #ifndef APP-NVUE */
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width: 100%;
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height: 100%;
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/* #endif */
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/* #ifdef APP-NVUE */
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flex: 1;
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/* #endif */
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}
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.offscreen {
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position: fixed;
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top: 0;
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left: 9999px;
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}
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</style> |