<template>
|
<view class="lime-signature" v-if="show" :style="[canvasStyle, styles]" ref="limeSignature">
|
<!-- #ifndef APP-VUE || APP-NVUE -->
|
<canvas v-if="useCanvas2d" class="lime-signature__canvas" :id="canvasId" type="2d"
|
:disableScroll="disableScroll" @touchstart="touchStart" @touchmove="touchMove"
|
@touchend="touchEnd"></canvas>
|
<canvas v-else :disableScroll="disableScroll" class="lime-signature__canvas" :canvas-id="canvasId"
|
:id="canvasId" :width="canvasWidth" :height="canvasHeight" @touchstart="touchStart" @touchmove="touchMove"
|
@touchend="touchEnd" @mousedown="touchStart" @mousemove="touchMove" @mouseup="touchEnd"></canvas>
|
<canvas v-if="showOffscreen" class="offscreen" canvas-id="offscreen" id="offscreen"
|
:style="'width:' + offscreenSize[0] + 'px;height:' + offscreenSize[1] + 'px'" :width="offscreenSize[0]"
|
:height="offscreenSize[1]">
|
</canvas>
|
<view v-if="showMask" class="mask" @touchstart="touchStart" @touchmove.stop.prevent="touchMove"
|
@touchend="touchEnd"></view>
|
<!-- #endif -->
|
<!-- #ifdef APP-VUE -->
|
<view :id="canvasId" :disableScroll="disableScroll" :rparam="param" :change:rparam="sign.update"
|
:rclear="rclear" :change:rclear="sign.clear" :rundo="rundo" :rredo="rredo" :change:rredo="sign.redo"
|
:change:rundo="sign.undo" :rsave="rsave" :rmask="rmask" :change:rsave="sign.save" :change:rmask="sign.mask"
|
:rdestroy="rdestroy" :change:rdestroy="sign.destroy" :rempty="rempty" :change:rempty="sign.isEmpty">
|
</view>
|
<!-- #endif -->
|
<!-- #ifdef APP-NVUE -->
|
<web-view src="/uni_modules/lime-signature/hybrid/html/index.html" class="lime-signature__canvas" ref="webview"
|
@pagefinish="onPageFinish" @error="onError" @onPostMessage="onMessage"></web-view>
|
<!-- #endif -->
|
</view>
|
</template>
|
|
<script>
|
// #ifndef APP-NVUE
|
import {
|
canIUseCanvas2d,
|
wrapEvent,
|
requestAnimationFrame,
|
sleep,
|
isTransparent
|
} from './utils'
|
import {
|
Signature
|
} from './signature.js'
|
// import {Signature} from '@signature';
|
import {
|
uniContext,
|
createImage,
|
toDataURL
|
} from './context'
|
// #endif
|
import props from './props';
|
import {
|
base64ToPath,
|
getRect
|
} from './utils'
|
import { nextTick } from 'vue';
|
|
/**
|
* LimeSignature 手写板签名
|
* @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。
|
* @property {Number} penSize 画笔大小
|
* @property {Number} minLineWidth 线条最小宽
|
* @property {Number} maxLineWidth 线条最大宽
|
* @property {String} penColor 画笔颜色
|
* @property {String} backgroundColor 背景颜色,不填则为透明
|
* @property {type} 指定 canvas 类型
|
* @value 2d canvas 2d
|
* @value '' 非 canvas 2d 旧接口，微信不再维护
|
* @property {Boolean} openSmooth 模拟笔锋
|
* @property {Number} beforeDelay 延时初始化，在放在弹窗里可以使用 （毫秒）
|
* @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
|
* @property {Boolean} landscape 横屏，使用后在最后生成图片时会图片旋转90度
|
* @property {Boolean} disableScroll 当在写字时，禁止屏幕滚动以及下拉刷新，nvue无效
|
* @property {Boolean} boundingBox 只生成内容区域，即未画部分不生成，有性能的损耗
|
*/
|
export default {
|
props,
|
data() {
|
return {
|
canvasWidth: null,
|
canvasHeight: null,
|
offscreenWidth: null,
|
offscreenHeight: null,
|
useCanvas2d: true,
|
show: true,
|
offscreenStyles: '',
|
showMask: false,
|
showOffscreen: false,
|
isPC: false,
|
// #ifdef APP-PLUS
|
rclear: 0,
|
rdestroy: 0,
|
rundo: 0,
|
rredo: 0,
|
rsave: JSON.stringify({
|
n: 0,
|
fileType: 'png',
|
quality: 1,
|
destWidth: 0,
|
destHeight: 0,
|
}),
|
rmask: JSON.stringify({
|
n: 0,
|
destWidth: 0,
|
destHeight: 0,
|
}),
|
rempty: 0,
|
risEmpty: true,
|
toDataURL: null,
|
tempFilePath: [],
|
// #endif
|
}
|
},
|
computed: {
|
canvasId() {
|
// #ifdef VUE2
|
return `lime-signature${this._uid}`
|
// #endif
|
// #ifdef VUE3
|
return `lime-signature${this._.uid}`
|
// #endif
|
},
|
offscreenId() {
|
return this.canvasId + 'offscreen'
|
},
|
offscreenSize() {
|
const {
|
offscreenWidth,
|
offscreenHeight
|
} = this
|
return this.landscape ? [offscreenHeight, offscreenWidth] : [offscreenWidth, offscreenHeight]
|
},
|
canvasStyle() {
|
const {
|
canvasWidth,
|
canvasHeight,
|
backgroundColor
|
} = this
|
return {
|
width: canvasWidth && (canvasWidth + 'px'),
|
height: canvasHeight && (canvasHeight + 'px'),
|
background: backgroundColor
|
}
|
},
|
param() {
|
const {
|
penColor,
|
penSize,
|
backgroundColor,
|
backgroundImage,
|
landscape,
|
boundingBox,
|
openSmooth,
|
minLineWidth,
|
maxLineWidth,
|
minSpeed,
|
maxWidthDiffRate,
|
maxHistoryLength,
|
disableScroll,
|
disabled
|
} = this
|
return JSON.parse(JSON.stringify({
|
penColor,
|
penSize,
|
backgroundColor,
|
backgroundImage,
|
landscape,
|
boundingBox,
|
openSmooth,
|
minLineWidth,
|
maxLineWidth,
|
minSpeed,
|
maxWidthDiffRate,
|
maxHistoryLength,
|
disableScroll,
|
disabled
|
}))
|
}
|
},
|
// #ifdef APP-NVUE
|
watch: {
|
param(v) {
|
this.$refs.webview.evalJS(`update(${JSON.stringify(v)})`)
|
}
|
},
|
// #endif
|
// #ifndef APP-PLUS
|
created() {
|
const {
|
platform
|
} = uni.getSystemInfoSync()
|
this.isPC = /windows|mac/.test(platform)
|
this.useCanvas2d = this.type == '2d' && canIUseCanvas2d() && !this.isPC
|
// #ifndef H5
|
this.showMask = this.isPC
|
// #endif
|
|
},
|
// #endif
|
// #ifndef APP-PLUS
|
async mounted() {
|
if (this.beforeDelay) {
|
await sleep(this.beforeDelay)
|
}
|
const config = await this.getContext()
|
this.signature = new Signature(config)
|
this.canvasEl = this.signature.canvas.get('el')
|
this.offscreenWidth = this.canvasWidth = this.signature.canvas.get('width')
|
this.offscreenHeight = this.canvasHeight = this.signature.canvas.get('height')
|
|
this.stopWatch = this.$watch('param', (v) => {
|
this.signature.pen.setOption(v)
|
}, {
|
immediate: true
|
})
|
},
|
// #endif
|
// #ifndef APP-PLUS
|
// #ifdef VUE3
|
beforeUnmount() {
|
this.stopWatch && this.stopWatch()
|
this.signature.destroy()
|
this.signature = null
|
this.show = false;
|
// #ifdef APP-VUE || APP-NVUE
|
this.rdestroy++
|
// #endif
|
},
|
// #endif
|
// #ifdef VUE2
|
beforeDestroy() {
|
this.stopWatch && this.stopWatch()
|
this.signature.destroy()
|
this.show = false;
|
this.signature = null
|
// #ifdef APP-VUE || APP-NVUE
|
this.rdestroy++
|
// #endif
|
},
|
// #endif
|
// #endif
|
methods: {
|
// #ifdef MP-QQ
|
// toJSON() { return this },
|
// #endif
|
// #ifdef APP-PLUS
|
onPageFinish() {
|
this.$refs.webview.evalJS(`update(${JSON.stringify(this.param)})`)
|
},
|
onMessage(e = {}) {
|
const {
|
detail: {
|
data: [res]
|
}
|
} = e
|
if (res.event?.save) {
|
this.toDataURL = res.event.save
|
}
|
if (res.event?.changeSize) {
|
const {
|
width,
|
height
|
} = res.event.changeSize
|
}
|
if (res.event.hasOwnProperty('isEmpty')) {
|
this.risEmpty = res.event.isEmpty
|
}
|
if (res.event?.file) {
|
this.tempFilePath.push(res.event.file)
|
if (this.tempFilePath.length > 7) {
|
this.tempFilePath.shift()
|
}
|
return
|
}
|
if (res.event?.success) {
|
if (res.event.success) {
|
this.tempFilePath.push(res.event.success)
|
if (this.tempFilePath.length > 8) {
|
this.tempFilePath.shift()
|
}
|
this.toDataURL = this.tempFilePath.join('')
|
this.tempFilePath = []
|
} else {
|
this.$emit('fail', 'canvas no data')
|
}
|
return
|
}
|
},
|
// #endif
|
redo() {
|
// #ifdef APP-VUE || APP-NVUE
|
this.rredo += 1
|
// #endif
|
// #ifdef APP-NVUE
|
this.$refs.webview.evalJS(`redo()`)
|
// #endif
|
// #ifndef APP-VUE
|
if (this.signature)
|
this.signature.redo()
|
// #endif
|
},
|
restore() {
|
this.redo()
|
},
|
undo() {
|
// #ifdef APP-VUE || APP-NVUE
|
this.rundo += 1
|
// #endif
|
// #ifdef APP-NVUE
|
this.$refs.webview.evalJS(`undo()`)
|
// #endif
|
// #ifndef APP-VUE
|
if (this.signature)
|
this.signature.undo()
|
// #endif
|
},
|
clear() {
|
// #ifdef APP-VUE || APP-NVUE
|
this.rclear += 1
|
// #endif
|
// #ifdef APP-NVUE
|
this.$refs.webview.evalJS(`clear()`)
|
// #endif
|
// #ifndef APP-VUE
|
if (this.signature)
|
this.signature.clear()
|
// #endif
|
},
|
isEmpty() {
|
// #ifdef APP-NVUE
|
this.$refs.webview.evalJS(`isEmpty()`)
|
// #endif
|
// #ifdef APP-VUE || APP-NVUE
|
this.rempty += 1
|
// #endif
|
// #ifndef APP-VUE || APP-NVUE
|
return this.signature.isEmpty()
|
// #endif
|
},
|
async canvasToMaskPath(param = {}) {
|
const isEmpty = this.isEmpty()
|
// #ifdef APP-NVUE
|
this.$refs.webview.evalJS(`mask(${JSON.stringify(param)})`)
|
// #endif
|
// #ifdef APP-VUE || APP-NVUE
|
const stopURLWatch = this.$watch('toDataURL', (v, n) => {
|
if (v && v !== n) {
|
// if(param.pathType == 'url') {
|
base64ToPath(v).then(res => {
|
param.success({
|
tempFilePath: res,
|
isEmpty: this.risEmpty
|
})
|
})
|
// } else {
|
// param.success({tempFilePath: v,isEmpty: this.risEmpty })
|
// }
|
this.toDataURL = ''
|
}
|
stopURLWatch && stopURLWatch()
|
})
|
const {
|
fileType,
|
quality
|
} = param
|
const rmask = JSON.parse(this.rmask)
|
rmask.n++
|
rmask.destWidth = param.destWidth ?? 0
|
rmask.destHeight = param.destHeight ?? 0
|
// rmask.fileType = fileType
|
// rmask.quality = quality
|
this.rmask = JSON.stringify(rmask)
|
// #endif
|
// #ifndef APP-VUE || APP-NVUE
|
this.showOffscreen = true
|
|
let width = this.signature.canvas.get('width')
|
let height = this.signature.canvas.get('height')
|
let {
|
pixelRatio
|
} = uni.getSystemInfoSync()
|
if (this.useCanvas2d) {
|
this.offscreenWidth = width * pixelRatio
|
this.offscreenHeight = height * pixelRatio
|
} else {
|
this.offscreenWidth = width
|
this.offscreenHeight = height
|
}
|
await sleep(100)
|
const context = uni.createCanvasContext('offscreen', this)
|
const size = Math.max(this.offscreenWidth, this.offscreenHeight)
|
const success = (success) => param.success && param.success(success)
|
const fail = (fail) => param.fail && param.fail(fail)
|
|
this.signature.pen.getMaskedImageData((imageData) => {
|
let canvasPutImageData = (options, comp) => {
|
if (uni.canvasPutImageData) {
|
uni.canvasPutImageData(options, comp)
|
} else if (context.putImageData) {
|
context.putImageData(options)
|
}
|
}
|
canvasPutImageData({
|
canvasId: 'offscreen',
|
x: 0,
|
y: 0,
|
width: width,
|
height:height,
|
data: imageData,
|
fail(err) {
|
fail(err)
|
},
|
success: (re) => {
|
toDataURL('offscreen', this, param).then((res) => {
|
context.restore()
|
context.clearRect(0, 0, size, size)
|
this.offscreenWidth = width
|
this.offscreenHeight = height
|
this.showOffscreen = false
|
success({
|
tempFilePath: res,
|
isEmpty
|
})
|
})
|
}
|
}, this)
|
|
})
|
// #endif
|
},
|
canvasToTempFilePath(param = {}) {
|
|
const isEmpty = this.isEmpty()
|
// #ifdef APP-NVUE
|
this.$refs.webview.evalJS(`save(${JSON.stringify(param)})`)
|
// #endif
|
// #ifdef APP-VUE || APP-NVUE
|
const stopURLWatch = this.$watch('toDataURL', (v, n) => {
|
if (v && v !== n) {
|
if (this.preferToDataURL) {
|
param.success({
|
tempFilePath: v,
|
isEmpty: this.risEmpty
|
})
|
} else {
|
base64ToPath(v).then(res => {
|
param.success({
|
tempFilePath: res,
|
isEmpty: this.risEmpty
|
})
|
})
|
}
|
this.toDataURL = ''
|
}
|
stopURLWatch && stopURLWatch()
|
})
|
const {
|
fileType,
|
quality
|
} = param
|
const rsave = JSON.parse(this.rsave)
|
rsave.n++
|
rsave.fileType = fileType
|
rsave.quality = quality
|
rsave.destWidth = param.destWidth ?? 0
|
rsave.destHeight = param.destHeight ?? 0
|
this.rsave = JSON.stringify(rsave)
|
// #endif
|
// #ifndef APP-VUE || APP-NVUE
|
const useCanvas2d = this.useCanvas2d
|
const success = (success) => param.success && param.success(success)
|
const fail = (err) => param.fail && param.fail(err)
|
const {
|
canvas
|
} = this.signature.canvas.get('el')
|
const {
|
backgroundColor,
|
landscape,
|
boundingBox
|
} = this
|
let width = this.signature.canvas.get('width')
|
let height = this.signature.canvas.get('height')
|
let x = 0
|
let y = 0
|
const devtools = uni.getSystemInfoSync().platform == 'devtools'
|
let preferToDataURL = this.preferToDataURL
|
let scale = 1
|
// #ifdef MP-TOUTIAO
|
scale = devtools ? uni.getSystemInfoSync().pixelRatio : scale
|
// 由于抖音不支持canvasToTempFilePath故优先使用createOffscreenCanvas
|
preferToDataURL = true
|
// #endif
|
const canvasToTempFilePath = async (image) => {
|
const createCanvasContext = () => {
|
const useOffscreen = (useCanvas2d && !!uni.createOffscreenCanvas && preferToDataURL)
|
if (useOffscreen && !devtools) {
|
const offCanvas = uni.createOffscreenCanvas({
|
type: '2d'
|
});
|
offCanvas.width = this.offscreenSize[0] * scale
|
offCanvas.height = this.offscreenSize[1] * scale
|
const context = offCanvas.getContext("2d");
|
return [context, offCanvas]
|
} else {
|
const context = uni.createCanvasContext('offscreen', this)
|
return [context]
|
}
|
}
|
|
if (boundingBox && !this.isPC || landscape || backgroundColor && !isTransparent(backgroundColor)) {
|
|
this.showOffscreen = true
|
await sleep(100)
|
const [context, offCanvas] = createCanvasContext()
|
context.save()
|
context.setTransform(1, 0, 0, 1, 0, 0)
|
if (landscape) {
|
context.translate(0, width * scale)
|
context.rotate(-Math.PI / 2)
|
}
|
if (backgroundColor && !isTransparent(backgroundColor)) {
|
context.fillStyle = backgroundColor
|
context.fillRect(0, 0, width, height)
|
}
|
if (offCanvas) {
|
const img = canvas.createImage();
|
img.src = image
|
img.onload = () => {
|
context.drawImage(img, 0, 0, width * scale, height * scale);
|
const tempFilePath = offCanvas.toDataURL()
|
this.showOffscreen = false
|
success({
|
tempFilePath,
|
isEmpty
|
})
|
}
|
|
} else {
|
context.drawImage(image, 0, 0, width * scale, height * scale);
|
context.draw(false, () => {
|
toDataURL('offscreen', this, param).then((res) => {
|
const size = Math.max(width, height)
|
context.restore()
|
context.clearRect(0, 0, size, size)
|
this.showOffscreen = false
|
success({
|
tempFilePath: res,
|
isEmpty
|
})
|
})
|
})
|
}
|
} else {
|
success({
|
tempFilePath: image,
|
isEmpty
|
})
|
}
|
}
|
const next = async () => {
|
if (this.offscreenWidth != width || this.offscreenHeight != height) {
|
this.offscreenWidth = width
|
this.offscreenHeight = height
|
await sleep(100)
|
}
|
|
// #ifndef MP-WEIXIN
|
const param = {
|
x,
|
y,
|
width,
|
height,
|
canvas,
|
preferToDataURL
|
}
|
// #endif
|
|
// #ifdef MP-WEIXIN
|
const param = {
|
x,
|
y,
|
width,
|
height,
|
canvas: useCanvas2d ? canvas : null,
|
preferToDataURL
|
}
|
// #endif
|
toDataURL(this.canvasId, this, param).then(canvasToTempFilePath).catch(fail)
|
}
|
// PC端小程序获取不到 ImageData 数据，长度为0
|
if (boundingBox && !this.isPC) {
|
this.signature.getContentBoundingBox(async res => {
|
this.offscreenWidth = width = res.width
|
this.offscreenHeight = height = res.height
|
|
x = res.startX
|
y = res.startY
|
|
next()
|
})
|
} else {
|
next()
|
}
|
// #endif
|
},
|
// #ifndef APP-PLUS
|
getContext() {
|
return getRect(`#${this.canvasId}`, {
|
context: this,
|
type: this.useCanvas2d ? 'fields' : 'boundingClientRect'
|
}).then(res => {
|
if (res) {
|
let {
|
width,
|
height,
|
node: canvas,
|
left,
|
top,
|
right
|
} = res
|
let {
|
pixelRatio
|
} = uni.getSystemInfoSync()
|
let context;
|
if (canvas) {
|
context = canvas.getContext('2d')
|
canvas.width = width * pixelRatio;
|
canvas.height = height * pixelRatio;
|
} else {
|
pixelRatio = 1
|
context = uniContext(this.canvasId, this)
|
canvas = {
|
getContext: (type) => type == '2d' ? context : null,
|
createImage,
|
toDataURL: () => toDataURL(this.canvasId, this),
|
requestAnimationFrame
|
}
|
}
|
// 支付宝小程序 使用stroke有个默认背景色
|
context.clearRect(0, 0, width, height)
|
return {
|
left,
|
top,
|
right,
|
width,
|
height,
|
context,
|
canvas,
|
pixelRatio
|
};
|
}
|
})
|
},
|
getTouch(e) {
|
if (this.isPC && this.canvasRect) {
|
e.touches = e.touches.map(item => {
|
return {
|
...item,
|
x: item.clientX - this.canvasRect.left,
|
y: item.clientY - this.canvasRect.top,
|
}
|
})
|
}
|
return e
|
},
|
touchStart(e) {
|
if (!this.canvasEl) return
|
this.isStart = true
|
// 微信小程序PC端不支持事件，使用这方法模拟一下
|
if (this.isPC) {
|
getRect(`#${this.canvasId}`, {
|
context: this
|
}).then(res => {
|
this.canvasRect = res
|
this.canvasEl.dispatchEvent('touchstart', wrapEvent(this.getTouch(e)))
|
})
|
return
|
}
|
this.canvasEl.dispatchEvent('touchstart', wrapEvent(e))
|
},
|
touchMove(e) {
|
if (!this.canvasEl || !this.isStart && this.canvasEl) return
|
this.canvasEl.dispatchEvent('touchmove', wrapEvent(this.getTouch(e)))
|
},
|
touchEnd(e) {
|
if (!this.canvasEl) return
|
this.isStart = false
|
this.canvasEl.dispatchEvent('touchend', wrapEvent(e))
|
},
|
// #endif
|
}
|
}
|
</script>
|
<!-- #ifdef APP-VUE -->
|
<script module="sign" lang="renderjs">
|
import sign from './render'
|
export default sign
|
</script>
|
<!-- #endif -->
|
<style lang="scss">
|
.lime-signature,
|
.lime-signature__canvas {
|
/* #ifndef APP-NVUE */
|
position: relative;
|
width: 100%;
|
height: 100%;
|
/* #endif */
|
/* #ifdef APP-NVUE */
|
flex: 1;
|
/* #endif */
|
}
|
|
.mask {
|
position: absolute;
|
left: 0;
|
right: 0;
|
bottom: 0;
|
top: 0;
|
}
|
|
.offscreen {
|
position: fixed;
|
top: 0;
|
// left: 0;
|
pointer-events:none;
|
// background: rgba(0,255,0,0.5);
|
left: 9999px;
|
}
|
</style>
|
