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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| import dayjs from "dayjs" | ||
| import html2canvas from "html2canvas" | ||
| import jsPDF from "jspdf" | ||
|
|
||
| export default class Dom2Pdf { | ||
| _rootDom = null | ||
| _title = "codebox-pdf" | ||
| _a4Width = 595.266 | ||
| _a4Height = 841.89 | ||
| _pageBackground = "rgba(255,255,255)" | ||
| _hex = [0xff, 0xff, 0xff] | ||
|
|
||
| constructor(rootDom, title, color = [255, 255, 255]) { | ||
| this._rootDom = rootDom | ||
| this._title = title | ||
| this._pageBackground = `rgb(${color[0]},${color[1]},${color[2]})` | ||
| this._hex = color | ||
| } | ||
|
|
||
| async savePdf() { | ||
| const a4Width = this._a4Width | ||
| const a4Height = this._a4Height | ||
| const hex = this._hex | ||
|
|
||
| return new Promise(async (resolve, reject) => { | ||
| try { | ||
| const canvas = await html2canvas(this._rootDom, { | ||
| useCORS: true, | ||
| allowTaint: true, | ||
| scale: 0.8, | ||
| backgroundColor: this._pageBackground | ||
| }) | ||
| const pdf = new jsPDF("p", "pt", "a4") | ||
| let index = 1, | ||
| canvas1 = document.createElement("canvas"), | ||
| height | ||
| let leftHeight = canvas.height | ||
|
|
||
| let a4HeightRef = Math.floor((canvas.width / a4Width) * a4Height) | ||
| let position = 0 | ||
| let pageData = canvas.toDataURL("image/jpeg", 0.7) | ||
| pdf.setDisplayMode("fullwidth", "continuous", "FullScreen") | ||
|
|
||
| function createImpl(canvas) { | ||
| if (leftHeight > 0) { | ||
| index++ | ||
| let checkCount = 0 | ||
| if (leftHeight > a4HeightRef) { | ||
| let i = position + a4HeightRef | ||
| for (i = position + a4HeightRef; i >= position; i--) { | ||
| let isWrite = true | ||
| for (let j = 0; j < canvas.width; j++) { | ||
| let c = canvas.getContext("2d").getImageData(j, i, 1, 1).data | ||
| if (c[0] !== hex[0] || c[1] !== hex[1] || c[2] !== hex[2]) { | ||
| isWrite = false | ||
| break | ||
| } | ||
| } | ||
| if (isWrite) { | ||
| checkCount++ | ||
| if (checkCount >= 10) { | ||
| break | ||
| } | ||
| } else { | ||
| checkCount = 0 | ||
| } | ||
| } | ||
| height = | ||
| Math.round(i - position) || Math.min(leftHeight, a4HeightRef) | ||
| if (height <= 0) { | ||
| height = a4HeightRef | ||
| } | ||
| } else { | ||
| height = leftHeight | ||
| } | ||
| canvas1.width = canvas.width | ||
| canvas1.height = height | ||
| let ctx = canvas1.getContext("2d") | ||
| ctx.drawImage( | ||
| canvas, | ||
| 0, | ||
| position, | ||
| canvas.width, | ||
| height, | ||
| 0, | ||
| 0, | ||
| canvas.width, | ||
| height | ||
| ) | ||
| if (position !== 0) { | ||
| pdf.addPage() | ||
| } | ||
| pdf.setFillColor(hex[0], hex[1], hex[2]) | ||
| pdf.rect(0, 0, a4Width, a4Height, "F") | ||
| pdf.addImage( | ||
| canvas1.toDataURL("image/jpeg", 1.0), | ||
| "JPEG", | ||
| 0, | ||
| 0, | ||
| a4Width, | ||
| (a4Width / canvas1.width) * height | ||
| ) | ||
| leftHeight -= height | ||
| position += height | ||
| if (leftHeight > 0) { | ||
| setTimeout(createImpl, 500, canvas) | ||
| } else { | ||
| resolve(pdf) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (leftHeight < a4HeightRef) { | ||
| pdf.setFillColor(hex[0], hex[1], hex[2]) | ||
| pdf.rect(0, 0, a4Width, a4Height, "F") | ||
| pdf.addImage( | ||
| pageData, | ||
| "JPEG", | ||
| 0, | ||
| 0, | ||
| a4Width, | ||
| (a4Width / canvas.width) * leftHeight | ||
| ) | ||
| resolve(pdf) | ||
| } else { | ||
| try { | ||
| pdf.deletePage(0) | ||
| setTimeout(createImpl, 500, canvas) | ||
| } catch (err) { | ||
| reject(err) | ||
| } | ||
| } | ||
| } catch (error) { | ||
| reject(error) | ||
| } | ||
| }) | ||
| } | ||
|
|
||
| async downloadPdf() { | ||
| const newPdf = (await this.savePdf()) as jsPDF | ||
| const title = `${this._title}-${dayjs().format("YYYY-MM-DD HH:mm:ss")}.pdf` | ||
| newPdf.save(title) | ||
| } | ||
|
|
||
| async printPdf() { | ||
| const newPdf = (await this.savePdf()) as jsPDF | ||
| const pdfBlob = newPdf.output("blob") | ||
| const pdfUrl = URL.createObjectURL(pdfBlob) | ||
| window.open(pdfUrl) | ||
| } | ||
| } |