480 lines
13 KiB
Vue
480 lines
13 KiB
Vue
<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 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" :change:rundo="sign.undo" :rsave="rsave"
|
||
:change:rsave="sign.save" :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 , isPC, isTransparent} from './utils'
|
||
import {Signature} from './signature'
|
||
// import {Signature} from '@signature';
|
||
import { uniContext, createImage, toDataURL } from './context'
|
||
// #endif
|
||
import props from './props';
|
||
import { base64ToPath, getRect } from './utils'
|
||
|
||
/**
|
||
* 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。
|
||
* @tutorial https://ext.dcloud.net.cn/plugin?id=4354
|
||
* @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,
|
||
// #ifdef APP-PLUS
|
||
rclear: 0,
|
||
rundo: 0,
|
||
rsave: JSON.stringify({
|
||
n: 0,
|
||
fileType: 'png',
|
||
quality: 1
|
||
}),
|
||
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,
|
||
landscape,
|
||
boundingBox,
|
||
openSmooth,
|
||
minLineWidth,
|
||
maxLineWidth,
|
||
minSpeed,
|
||
maxWidthDiffRate,
|
||
maxHistoryLength,
|
||
disableScroll
|
||
} = this
|
||
return JSON.parse(JSON.stringify({
|
||
penColor,
|
||
penSize,
|
||
backgroundColor,
|
||
landscape,
|
||
boundingBox,
|
||
openSmooth,
|
||
minLineWidth,
|
||
maxLineWidth,
|
||
minSpeed,
|
||
maxWidthDiffRate,
|
||
maxHistoryLength,
|
||
disableScroll
|
||
}))
|
||
}
|
||
},
|
||
// #ifdef APP-NVUE
|
||
watch: {
|
||
param(v) {
|
||
this.$refs.webview.evalJS(`update(${JSON.stringify(v)})`)
|
||
}
|
||
},
|
||
// #endif
|
||
// #ifndef APP-PLUS
|
||
created() {
|
||
this.useCanvas2d = this.type == '2d' && canIUseCanvas2d() && !isPC
|
||
this.showMask = isPC
|
||
},
|
||
// #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.$watch('param', (v) => {
|
||
this.signature.pen.setOption(v)
|
||
}, {
|
||
immediate: true
|
||
})
|
||
},
|
||
// #endif
|
||
// #ifndef APP-PLUS
|
||
// #ifdef VUE3
|
||
beforeUnmount() {
|
||
this.stopWatch && this.stopWatch()
|
||
this.signature.destroy()
|
||
this.signature = null
|
||
this.show = false;
|
||
},
|
||
// #endif
|
||
// #ifdef VUE2
|
||
beforeDestroy() {
|
||
this.stopWatch && this.stopWatch()
|
||
this.signature.destroy()
|
||
this.show = false;
|
||
this.signature = null
|
||
},
|
||
// #endif
|
||
// #endif
|
||
methods: {
|
||
// #ifdef MP-QQ
|
||
// toJSON() { return this },
|
||
// #endif
|
||
// #ifdef APP-PLUS
|
||
onPageFinish() {
|
||
this.$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
|
||
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.$refs.webview.evalJS(`isEmpty()`)
|
||
// #endif
|
||
// #ifdef APP-VUE || APP-NVUE
|
||
this.rempty += 1
|
||
// #endif
|
||
// #ifndef APP-VUE || APP-NVUE
|
||
return this.signature.isEmpty()
|
||
// #endif
|
||
},
|
||
canvasToTempFilePath(param) {
|
||
const isEmpty = this.isEmpty()
|
||
// #ifdef APP-NVUE
|
||
this.$refs.webview.evalJS(`save()`)
|
||
// #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 rsave = JSON.parse(this.rsave)
|
||
rsave.n++
|
||
rsave.fileType = fileType
|
||
rsave.quality = quality
|
||
this.rsave = JSON.stringify(rsave)
|
||
// #endif
|
||
// #ifndef APP-VUE || APP-NVUE
|
||
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 canvasToTempFilePath = (image) => {
|
||
const context = uni.createCanvasContext('offscreen', this)
|
||
context.save()
|
||
context.setTransform(1, 0, 0, 1, 0, 0)
|
||
if (landscape) {
|
||
context.translate(0, width)
|
||
context.rotate(-Math.PI / 2)
|
||
}
|
||
if (backgroundColor && !isTransparent(backgroundColor)) {
|
||
context.fillStyle = backgroundColor
|
||
context.fillRect(0, 0, width, height)
|
||
}
|
||
context.drawImage(image, 0, 0, width, height);
|
||
|
||
context.draw(false, () => {
|
||
toDataURL('offscreen', this, param).then((res) => {
|
||
const size = Math.max(width, height)
|
||
context.restore()
|
||
context.clearRect(0, 0, size, size)
|
||
success({
|
||
tempFilePath: res,
|
||
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 }
|
||
// #endif
|
||
|
||
// #ifdef MP-WEIXIN
|
||
const param = { x, y, width, height, canvas: this.useCanvas2d ? canvas : null}
|
||
// #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 && !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 = {
|
||
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(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(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: 9999px;
|
||
}
|
||
</style> |