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src/components/lime-painter/components/l-painter/l-painter.vue

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+<template>
+	<view class="lime-painter" ref="limepainter">
+		<view v-if="canvasId && size" :style="styles">
+			<!-- #ifndef APP-NVUE -->
+			<canvas class="lime-painter__canvas" v-if="use2dCanvas" :id="canvasId" type="2d" :style="size"></canvas>
+			<canvas class="lime-painter__canvas" v-else :id="canvasId" :canvas-id="canvasId" :style="size"
+				:width="boardWidth * dpr" :height="boardHeight * dpr" :hidpi="hidpi"></canvas>
+
+			<!-- #endif -->
+			<!-- #ifdef APP-NVUE -->
+			<web-view :style="size" ref="webview"
+				src="/uni_modules/lime-painter/hybrid/html/index.html"
+				class="lime-painter__canvas" @pagefinish="onPageFinish" @error="onError" @onPostMessage="onMessage">
+			</web-view>
+			<!-- #endif -->
+		</view>
+		<slot />
+	</view>
+</template>
+
+<script>
+	import { parent } from '../common/relation'
+	import props from './props'
+	import {toPx, base64ToPath, pathToBase64, isBase64, sleep, getImageInfo }from './utils';
+	//  #ifndef APP-NVUE
+	import { canIUseCanvas2d, isPC} from './utils';
+	import Painter from './painter';
+	// import Painter from '@painter'
+	const nvue = {}
+	//  #endif
+	//  #ifdef APP-NVUE
+	import nvue from './nvue'
+	//  #endif
+	export default {
+		name: 'lime-painter',
+		mixins: [props, parent('painter'), nvue],
+		data() {
+			return {
+				use2dCanvas: false,
+				canvasHeight: 150,
+				canvasWidth: null,
+				parentWidth: 0,
+				inited: false,
+				progress: 0,
+				firstRender: 0,
+				done: false,
+				tasks: []
+			};
+		},
+		computed: {
+			styles() {
+				return `${this.size}${this.customStyle||''};` + (this.hidden && 'position: fixed; left: 1500rpx;')
+			},
+			canvasId() {
+				return `l-painter${this._ && this._.uid || this._uid}`
+			},
+			size() {
+				if (this.boardWidth && this.boardHeight) {
+					return `width:${this.boardWidth}px; height: ${this.boardHeight}px;`;
+				}
+			},
+			dpr() {
+				return this.pixelRatio || uni.getSystemInfoSync().pixelRatio;
+			},
+			boardWidth() {
+				const {width = 0} = (this.elements && this.elements.css) || this.elements || this
+				const w = toPx(width||this.width)
+				return w || Math.max(w, toPx(this.canvasWidth));
+			},
+			boardHeight() {
+				const {height = 0} = (this.elements && this.elements.css) || this.elements || this
+				const h = toPx(height||this.height)
+				return h || Math.max(h, toPx(this.canvasHeight));
+			},
+			hasBoard() {
+				return this.board && Object.keys(this.board).length
+			},
+			elements() {
+				return this.hasBoard ? this.board : JSON.parse(JSON.stringify(this.el))
+			}
+		},
+		created() {
+			this.use2dCanvas = this.type === '2d' && canIUseCanvas2d() && !isPC
+		},
+		async mounted() {
+			await sleep(30)
+			await this.getParentWeith()
+			this.$nextTick(() => {
+				setTimeout(() => {
+					this.$watch('elements', this.watchRender, {
+						deep: true,
+						immediate: true
+					});
+				}, 30)
+			})
+		},
+		// #ifdef VUE3
+		unmounted() {
+			this.done = false
+			this.inited = false
+			this.firstRender = 0
+			this.progress = 0
+			this.painter = null
+			clearTimeout(this.rendertimer)
+		},
+		// #endif
+		// #ifdef VUE2
+		destroyed() {
+			this.done = false
+			this.inited = false
+			this.firstRender = 0
+			this.progress = 0
+			this.painter = null
+			clearTimeout(this.rendertimer)
+		},
+		// #endif
+		methods: {
+			async watchRender(val, old) {
+				if (!val || !val.views || (!this.firstRender ? !val.views.length : !this.firstRender) || !Object.keys(val).length || JSON.stringify(val) == JSON.stringify(old)) return;
+				this.firstRender = 1
+				this.progress = 0
+				this.done = false
+				clearTimeout(this.rendertimer)
+				this.rendertimer = setTimeout(() => {
+					this.render(val);
+				}, this.beforeDelay)
+			},
+			async setFilePath(path, param) {
+				let filePath = path
+				const {pathType = this.pathType} =  param || this
+				if (pathType == 'base64' && !isBase64(path)) {
+					filePath = await pathToBase64(path)
+				} else if (pathType == 'url' && isBase64(path)) {
+					filePath = await base64ToPath(path)
+				}
+				if (param && param.isEmit) {
+					this.$emit('success', filePath);
+				}
+				return filePath
+			},
+			async getSize(args) {
+				const {width} = args.css || args
+				const {height} = args.css || args
+				if (!this.size) {
+					if (width || height) {
+						this.canvasWidth = width || this.canvasWidth
+						this.canvasHeight = height || this.canvasHeight
+						await sleep(30);
+					} else {
+						await this.getParentWeith()
+					}
+				}
+			},
+			canvasToTempFilePathSync(args) {
+				// this.stopWatch && this.stopWatch()
+				// this.stopWatch = this.$watch('done', (v) => {
+				// 	if (v) {
+				// 		this.canvasToTempFilePath(args)
+				// 		this.stopWatch && this.stopWatch()
+				// 	}
+				// }, {
+				// 	immediate: true
+				// })
+				this.tasks.push(args)
+				if(this.done){
+					this.runTask()
+				}
+			},
+			runTask(){
+				while(this.tasks.length){
+					const task = this.tasks.shift()	
+					 this.canvasToTempFilePath(task)
+				}
+			},
+			// #ifndef APP-NVUE
+			getParentWeith() {
+				return new Promise(resolve => {
+					uni.createSelectorQuery()
+						.in(this)
+						.select(`.lime-painter`)
+						.boundingClientRect()
+						.exec(res => {
+							const {width, height} = res[0]||{}
+							this.parentWidth = Math.ceil(width||0)
+							this.canvasWidth = this.parentWidth || 300
+							this.canvasHeight = height || this.canvasHeight||150
+							resolve(res[0])
+						})
+				})
+			},
+			async render(args = {}) {
+				if(!Object.keys(args).length) {
+					return console.error('空对象')
+				}
+				this.progress = 0
+				this.done = false
+				// #ifdef APP-NVUE
+				this.tempFilePath.length = 0
+				// #endif
+				await this.getSize(args)
+				const ctx = await this.getContext();
+				
+				let {
+					use2dCanvas,
+					boardWidth,
+					boardHeight,
+					canvas,
+					afterDelay
+				} = this;
+				if (use2dCanvas && !canvas) {
+					return Promise.reject(new Error('canvas 没创建'));
+				}
+				this.boundary = {
+					top: 0,
+					left: 0,
+					width: boardWidth,
+					height: boardHeight
+				};
+				this.painter = null
+				if (!this.painter) {
+					const {width} = args.css || args
+					const {height} = args.css || args
+					if(!width && this.parentWidth) {
+						Object.assign(args, {width: this.parentWidth})
+					}
+					const param = {
+						context: ctx,
+						canvas,
+						width: boardWidth,
+						height: boardHeight,
+						pixelRatio: this.dpr,
+						useCORS: this.useCORS,
+						createImage: getImageInfo.bind(this),
+						performance: this.performance,
+						listen: {
+							onProgress: (v) => {
+								this.progress = v
+								this.$emit('progress', v)
+							},
+							onEffectFail: (err) => {
+								this.$emit('faill', err)
+							}
+						}
+					}
+					this.painter = new Painter(param)
+				} 
+				try{
+					// vue3 赋值给data会引起图片无法绘制
+					const { width, height } = await this.painter.source(JSON.parse(JSON.stringify(args)))
+					this.boundary.height = this.canvasHeight = height
+					this.boundary.width = this.canvasWidth = width
+					await sleep(this.sleep);
+					await this.painter.render()
+					await new Promise(resolve => this.$nextTick(resolve));
+					if (!use2dCanvas) {
+						await this.canvasDraw();
+					}
+					if (afterDelay && use2dCanvas) {
+						await sleep(afterDelay);
+					}
+					this.$emit('done');
+					this.done = true
+					if (this.isCanvasToTempFilePath) {
+						this.canvasToTempFilePath()
+							.then(res => {
+								this.$emit('success', res.tempFilePath)
+							})
+							.catch(err => {
+								this.$emit('fail', new Error(JSON.stringify(err)));
+							});
+					}
+					this.runTask()
+					return Promise.resolve({
+						ctx,
+						draw: this.painter,
+						node: this.node
+					});
+				}catch(e){
+					//TODO handle the exception
+				}
+				
+			},
+			canvasDraw(flag = false) {
+				return new Promise((resolve, reject) => this.ctx.draw(flag, () => setTimeout(() => resolve(), this
+					.afterDelay)));
+			},
+			async getContext() {
+				if (!this.canvasWidth) {
+					this.$emit('fail', 'painter no size')
+					console.error('[lime-painter]: 给画板或父级设置尺寸')
+					return Promise.reject();
+				}
+				if (this.ctx && this.inited) {
+					return Promise.resolve(this.ctx);
+				}
+				const { type, use2dCanvas, dpr, boardWidth, boardHeight } = this;
+				const _getContext = () => {
+					return new Promise(resolve => {
+						uni.createSelectorQuery()
+							.in(this)
+							.select(`#${this.canvasId}`)
+							.boundingClientRect()
+							.exec(res => {
+								if (res) {
+									const ctx = uni.createCanvasContext(this.canvasId, this);
+									if (!this.inited) {
+										this.inited = true;
+										this.use2dCanvas = false;
+										this.canvas = res;
+									}
+									
+									// 钉钉小程序框架不支持 measureText 方法，用此方法 mock
+									if (!ctx.measureText) {
+										function strLen(str) {
+											let len = 0;
+											for (let i = 0; i < str.length; i++) {
+												if (str.charCodeAt(i) > 0 && str.charCodeAt(i) < 128) {
+													len++;
+												} else {
+													len += 2;
+												}
+											}
+											return len;
+										}
+										ctx.measureText = text => {
+											let fontSize = ctx.state && ctx.state.fontSize || 12;
+											const font = ctx.__font
+											if (font && fontSize == 12) {
+												fontSize = parseInt(font.split(' ')[3], 10);
+											}
+											fontSize /= 2;
+											return {
+												width: strLen(text) * fontSize
+											};
+										}
+									}
+									
+									// #ifdef MP-ALIPAY
+									ctx.scale(dpr, dpr);
+									// #endif
+									this.ctx = ctx
+									resolve(this.ctx);
+								} else {
+									console.error('[lime-painter] no node')
+								}
+							});
+					});
+				};
+				if (!use2dCanvas) {
+					return _getContext();
+				}
+				return new Promise(resolve => {
+					uni.createSelectorQuery()
+						.in(this)
+						.select(`#${this.canvasId}`)
+						.node()
+						.exec(res => {
+							let {node: canvas} = res && res[0]||{};
+							if(canvas) {
+								const ctx = canvas.getContext(type);
+								if (!this.inited) {
+									this.inited = true;
+									this.use2dCanvas = true;
+									this.canvas = canvas;
+								}
+								this.ctx = ctx
+								resolve(this.ctx);
+							} else {
+								console.error('[lime-painter]: no size')
+							}
+						});
+				});
+			},
+			canvasToTempFilePath(args = {}) {
+				return new Promise(async (resolve, reject) => {
+					const { use2dCanvas, canvasId, dpr, fileType, quality } = this;
+					const success = async (res) => {
+						try {
+							const tempFilePath = await this.setFilePath(res.tempFilePath || res, args)
+							const result = Object.assign(res, {tempFilePath})
+							args.success && args.success(result)
+							resolve(result)
+						} catch (e) {
+							this.$emit('fail', e)
+						}
+					}
+					
+					let { top: y = 0, left: x = 0, width, height } = this.boundary || this;
+					// let destWidth = width * dpr;
+					// let destHeight = height * dpr;
+					// #ifdef MP-ALIPAY
+					// width = destWidth;
+					// height = destHeight;
+					// #endif
+					
+					const copyArgs = Object.assign({
+						// x,
+						// y,
+						// width,
+						// height,
+						// destWidth,
+						// destHeight,
+						canvasId,
+						id: canvasId,
+						fileType,
+						quality,
+					}, args, {success});
+					// if(this.isPC || use2dCanvas) {
+					// 	copyArgs.canvas = this.canvas
+					// }
+					if (use2dCanvas) {
+						copyArgs.canvas = this.canvas
+						try{
+							// #ifndef MP-ALIPAY
+							const oFilePath = this.canvas.toDataURL(`image/${args.fileType||fileType}`.replace(/pg/, 'peg'), args.quality||quality)
+							if(/data:,/.test(oFilePath)) {
+								uni.canvasToTempFilePath(copyArgs, this);
+							} else {
+								const tempFilePath = await this.setFilePath(oFilePath, args)
+								args.success && args.success({tempFilePath})
+								resolve({tempFilePath})
+							}
+							// #endif
+							// #ifdef MP-ALIPAY
+							this.canvas.toTempFilePath(copyArgs)
+							// #endif
+						}catch(e){
+							args.fail && args.fail(e)
+							reject(e)
+						}
+					} else {
+						// #ifdef MP-ALIPAY
+						if(this.ctx.toTempFilePath) {
+							// 钉钉
+							const ctx = uni.createCanvasContext(canvasId);
+							ctx.toTempFilePath(copyArgs);
+						} else {
+							my.canvasToTempFilePath(copyArgs);
+						}
+						// #endif
+						// #ifndef MP-ALIPAY
+						uni.canvasToTempFilePath(copyArgs, this);
+						// #endif
+					}
+				})
+			}
+			// #endif
+		}
+	};
+</script>
+<style>
+	.lime-painter,
+	.lime-painter__canvas {
+		// #ifndef APP-NVUE
+		width: 100%;
+		// #endif
+		// #ifdef APP-NVUE
+		flex: 1;
+		// #endif
+	}
+</style>