172 lines
5.6 KiB
Markdown
172 lines
5.6 KiB
Markdown
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# signature 写字板
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> uniapp 写字板，可用业务签名等场景
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> [查看更多 站点1](https://limeui.qcoon.cn/#/signature) <br>
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> [查看更多 站点2](http://liangei.gitee.io/limeui/#/signature)
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> Q群：1169785031
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## 平台兼容
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| H5 | 微信小程序 | 支付宝小程序 | 百度小程序 | 头条小程序 | QQ 小程序 | App |
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| --- | ---------- | ------------ | ---------- | ---------- | --------- | --- |
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| √ | √ | √ | 未测 | 未测 | 未测 | √ |
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## 代码演示
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### 基本用法
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```html
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<view style="width: 750rpx ;height: 750rpx;">
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<l-signature disableScroll ref="signatureRef" :penColor="penColor" :penSize="penSize" :openSmooth="openSmooth" ></l-signature>
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</view>
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<view>
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<button @click="onClick('clear')">清空</button>
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<button @click="onClick('undo')">撤消</button>
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<button @click="onClick('save')">保存</button>
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<!-- uvue 不支持 openSmooth -->
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<button @click="onClick('openSmooth')">压感{{openSmooth?'开':'关'}}</button>
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</view>
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```
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### Vue/Nvue
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```js
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export default {
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data() {
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return {
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title: 'Hello',
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penColor: 'red',
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penSize: 5,
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url: '',
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openSmooth: true
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}
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},
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methods: {
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onClick(type) {
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if(type == 'openSmooth') {
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this.openSmooth = !this.openSmooth
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return
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}
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if (type == 'save') {
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this.$refs.signatureRef.canvasToTempFilePath({
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success: (res) => {
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// 是否为空画板 无签名
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console.log(res.isEmpty)
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// 生成图片的临时路径
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// H5 生成的是base64
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this.url = res.tempFilePath
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}
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})
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return
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}
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if (this.$refs.signatureRef)
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this.$refs.signatureRef[type]()
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}
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}
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}
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```
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### Uvue
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```js
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import {LSignatureToTempFilePathOptions, LSignatureToFileSuccess} from '@/uni_modules/lime-signature'
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export default {
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data() {
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return {
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title: 'Hello',
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penColor: 'red',
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penSize: 5,
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url: '',
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openSmooth: true
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}
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},
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methods: {
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onClick(type: string) {
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const signatureRef = this.$refs['signatureRef'] as LSignatureComponentPublicInstance
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// 不支持
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if(type == 'openSmooth') {
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return
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}
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if (type == 'save') {
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signatureRef.canvasToTempFilePath({
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success: (res: LSignatureToFileSuccess) => {
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// 是否为空画板 无签名
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console.log(res.isEmpty)
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// 生成图片的临时路径
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// H5 生成的是base64
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this.url = res.tempFilePath
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}
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} as LSignatureToTempFilePathOptions)
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return
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}
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if(type == 'undo'){
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signatureRef.undo()
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}
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if(type == 'redo'){
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signatureRef.redo()
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}
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if(type == 'clear'){
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signatureRef.clear()
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}
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}
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}
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}
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```
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### 横屏
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通过设置`landscape`,改变生成图片的方向，达到横屏的作用
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```html
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<view style="width: 100vw; height: 100vh;">
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<l-signature landscape></l-signature>
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</view>
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<view style="transform: rotate(90deg);">
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<button @click="onClick('clear')">清空</button>
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<button @click="onClick('undo')">撤消</button>
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<button @click="onClick('save')">保存</button>
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<button @click="onClick('openSmooth')">压感{{openSmooth?'开':'关'}}</button>
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</view>
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```
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### 插件标签
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- 默认 l-signature 为 component
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- 默认 lime-signature 为 demo
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demo使用了`uni-popup`,如果要看演示请自行导入这个插件
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## API
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### Props
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| 参数 | 说明 | 类型 | 默认值 |
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| -------------- | ------------ | ---------------- | ------------ |
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| penSize | 画笔大小 | <em>number</em> | `2` |
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| minLineWidth | 线条最小宽 | <em>number</em> | `2` |
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| maxLineWidth | 线条最大宽 | <em>number</em> | `6` |
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| penColor | 画笔颜色 | <em>string</em> | `black` |
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| backgroundColor | 背景颜色(不填则为透明背景) | <em>string</em> | `` |
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| type | 指定 canvas 类型 **uvue暂不支持** | <em>string</em> | `2d` |
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| openSmooth | 是否模拟压感 **uvue暂不支持** | <em>boolean</em> | `false` |
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| beforeDelay | 延时初始化，在放在弹窗里可以使用 （毫秒） | <em>number</em> | `0` |
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| 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 | <em>boolean</em> | `20` |
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| landscape | 横屏 | <em>boolean</em> | `` |
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| disableScroll | 当在写字时，禁止屏幕滚动以及下拉刷新 | <em>boolean</em> | `true` |
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| disabled | 禁用 | <em>boolean</em> | `false` |
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| boundingBox | 只生成内容区域，即未画部分不生成，有性能的损耗（微信小程序pc/uvue不支持） | <em>boolean</em> | `false` |
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### 事件 Events
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| 事件名 | 说明 | 回调 |
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| ------- | ------------ | -------------- |
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| undo | 撤消，回退到上一步 | |
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| clear | 清空，清空画板 | |
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| canvasToTempFilePath | 保存，生成图片，与官方保持一致，但不需要传canvasId | |
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### 常见问题
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- 放在弹窗里时，尺寸不对 可以延时手写板出现时机，给手写板加vif或beforeDelay="300"
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- boundingBox 微信小程序 pc / uvue 不支持, 因为获取不到 ImageData 数据
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- backgroundColor 不能设置为`transparent`,填了也没用，我在代码里排除了。因为会导致微信小程序无法生成图片
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### 打赏
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如果你觉得本插件，解决了你的问题，赠人玫瑰，手留余香。
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