feat(文档导出): 新增文档导出进度显示

assets/webui/ofdgo.css

@@ -839,6 +839,7 @@ button.outline-link:hover {
 	overflow: hidden;
 	color: #1f2428;
 	font-size: 13px;
+	font-variant-numeric: tabular-nums;
 	text-overflow: ellipsis;
 	white-space: nowrap;
 }

assets/webui/ofdgo.js

@@ -670,6 +670,16 @@ async function loadWASM() {
 			}
 			if (data.type === "progress") {
 				setProgress(data.text, data.percent);
+			} else if (data.type === "export") {
+				if (wasmRequests.get(data.id)?.openSeq === state.openSeq && state.exporting) {
+					if (data.stage === "save") {
+						setProgress("正在保存", null);
+					} else if (data.completed === data.total) {
+						setProgress("正在封装", null);
+					} else {
+						setProgress(`正在导出 ${data.completed} / ${data.total} 页`, data.completed / data.total * 100);
+					}
+				}
 			} else if (data.type === "ready") {
 				state.ready = true;
 				resolve();
@@ -1589,7 +1599,6 @@ async function exportFile(whole, indices = null) {
 		if (openSeq !== state.openSeq) {
 			return;
 		}
-		setProgress(`正在保存 ${result.label}`, 100);
 		if (result.blob) {
 			downloadBytes(result.blob, result.mime, fileName);
 		}
@@ -3302,7 +3311,7 @@ async function callWASM(name, ...args) {
 	}
 	return new Promise((resolve, reject) => {
 		const id = ++wasmRequestID;
-		wasmRequests.set(id, { resolve, reject });
+		wasmRequests.set(id, { resolve, reject, openSeq: state.openSeq });
 		try {
 			wasmWorker.postMessage({ id, name, args });
 		} catch (err) {

assets/webui/ofdgo.wasm.js

@@ -24,11 +24,17 @@ async function handleMessage({ id, name, args }) {
 					setTimeout(done, 0);
 				}
 			});
+			if (name === "ofdgoExportDocument") {
+				args.push((completed, total) => {
+					self.postMessage({ id, type: "export", stage: "pages", completed, total });
+				});
+			}
 		}
 		const payload = await globalThis[name](...args);
 		const result = typeof payload === "string" ? JSON.parse(payload) : payload;
 		if (exporting && result.ok) {
 			result.data.size = size;
+			self.postMessage({ id, type: "export", stage: "save" });
 			if (output) {
 				await output.close();
 			} else {

internal/webui/wasm.go

@@ -335,6 +335,11 @@ func exportDocument(args []js.Value) (any, error) {
 	if currentSession == nil {
 		return nil, fmt.Errorf("ofd document is not opened")
 	}
+	renderer := currentSession.Renderer
+	renderer.OnExportProgress = func(completed, total int) {
+		args[4].Invoke(completed, total)
+	}
+	defer func() { renderer.OnExportProgress = nil }()
 	var indices []int
 	if !args[2].IsNull() {
 		indices = make([]int, args[2].Length())

ofdgo_renderer.go

@@ -24,11 +24,13 @@ import (
 // Renderer 渲染器实现
 // 通过NewRenderer创建，实例及共享的Reader需串行使用
 // OnPageText可选，接收页面绘制时同步提取的文字，不包含图案和签名外观
+// OnExportProgress可选，同步回报文档导出的已处理页数及总页数，不代表封装或写入成功
 type Renderer struct {
 	Reader                *Reader
 	DPI                   float64
 	RenderAnnotations     bool
 	OnPageText            func(*PageContent, *PageText)
+	OnExportProgress      func(completed, total int)
 	DrawParams            map[string]*DrawParam
 	CompositeGraphicUnits map[string]*CompositeGraphicUnit
 	fontFamily            *canvas.FontFamily

ofdgo_renderer_output.go

@@ -90,7 +90,10 @@ func (r *Renderer) RenderToZIP(writer io.Writer, format string, indices ...int)
 		method = zip.Store
 	}
 	width := len(strconv.Itoa(count))
-	for _, index := range indices {
+	if r.OnExportProgress != nil {
+		r.OnExportProgress(0, len(indices))
+	}
+	for i, index := range indices {
 		page, err := r.Reader.PageContentByIndex(index)
 		if err != nil {
 			return fmt.Errorf("failed to read page %d: %w", index+1, err)
@@ -105,6 +108,9 @@ func (r *Renderer) RenderToZIP(writer io.Writer, format string, indices ...int)
 		if err := render(page, entry); err != nil {
 			return fmt.Errorf("failed to export page %d: %w", index+1, err)
 		}
+		if r.OnExportProgress != nil {
+			r.OnExportProgress(i+1, len(indices))
+		}
 	}
 	return archive.Close()
 }
@@ -248,7 +254,7 @@ func (r *Renderer) RenderToPDF(page *PageContent, writer io.Writer) error {
 		return err
 	}
 	pages := []pdfPage{{Content: page, Box: box}}
-	return r.renderPDFPages(pages, writer)
+	return r.renderPDFPages(pages, writer, nil)
 }
 
 // RenderToEPS 渲染为EPS
@@ -282,6 +288,9 @@ func (r *Renderer) RenderToMultiPagePDF(writer io.Writer, indices ...int) error
 	if err != nil {
 		return err
 	}
+	if r.OnExportProgress != nil {
+		r.OnExportProgress(0, len(indices))
+	}
 	pages := make([]pdfPage, len(indices))
 	for i, index := range indices {
 		page, err := r.Reader.PageContent(doc.Pages.Page[index])
@@ -294,7 +303,7 @@ func (r *Renderer) RenderToMultiPagePDF(writer io.Writer, indices ...int) error
 		}
 		pages[i] = pdfPage{Content: page, Box: box}
 	}
-	return r.renderPDFPages(pages, writer)
+	return r.renderPDFPages(pages, writer, r.OnExportProgress)
 }
 
 // RenderPagesToPDF 按指定顺序导出已解析的页面，复用调用方的页面缓存
@@ -304,6 +313,9 @@ func (r *Renderer) RenderPagesToPDF(contents []*PageContent, writer io.Writer) e
 	if len(contents) == 0 {
 		return fmt.Errorf("no pages found")
 	}
+	if r.OnExportProgress != nil {
+		r.OnExportProgress(0, len(contents))
+	}
 	pages := make([]pdfPage, len(contents))
 	for i, page := range contents {
 		box, err := r.GetPageBox(page)
@@ -312,13 +324,13 @@ func (r *Renderer) RenderPagesToPDF(contents []*PageContent, writer io.Writer) e
 		}
 		pages[i] = pdfPage{Content: page, Box: box}
 	}
-	return r.renderPDFPages(pages, writer)
+	return r.renderPDFPages(pages, writer, r.OnExportProgress)
 }
 
 // renderPDFPages 渲染页面并复用调用方的字节缓冲
-// 入参: pages 页面列表, writer 输出流
+// 入参: pages 页面列表, writer 输出流, progress 页面处理进度
 // 返回: error 错误信息
-func (r *Renderer) renderPDFPages(pages []pdfPage, writer io.Writer) error {
+func (r *Renderer) renderPDFPages(pages []pdfPage, writer io.Writer, progress func(int, int)) error {
 	navigation := newPDFNavigation(r, r.Reader.doc, pages)
 	buf, direct := writer.(*bytes.Buffer)
 	if !direct {
@@ -337,6 +349,9 @@ func (r *Renderer) renderPDFPages(pages []pdfPage, writer io.Writer) error {
 			buf.Truncate(start)
 			return fmt.Errorf("failed to render page %d: %w", i+1, err)
 		}
+		if progress != nil {
+			progress(i+1, len(pages))
+		}
 	}
 	if err := p.Close(); err != nil {
 		buf.Truncate(start)