feat(签章能力): 优化签章画布定位交互

assets/webui/index.html

@@ -438,6 +438,7 @@
 				<div class="form-row"><label for="signIntermediates">中间证书</label><input id="signIntermediates" type="file" accept=".pem,.cer,.crt,.der" multiple></div>
 				<div class="form-row"><label for="signSeal">电子印章</label><input id="signSeal" type="file" accept=".esl,.ses,.der" aria-label="SES电子印章"></div>
 				<div id="signPlacementFields" hidden>
+					<div class="form-row"><span>预览</span><div class="seal-position-options"><button id="signPick" class="button" type="button">定位</button><label><input id="signKeepRatio" type="checkbox" checked>等比</label></div></div>
 					<div class="form-row"><label for="signPlacement">位置</label><select id="signPlacement"><option value="normal">页面</option><option value="seam">骑缝</option></select></div>
 					<div class="form-row"><label for="signPages">页码</label><input id="signPages" type="text" autocomplete="off" spellcheck="false"></div>
 					<div class="form-row"><label for="signX">横坐标</label><div class="form-unit"><input id="signX" type="number" min="0" step="any" value="10" aria-label="横坐标（毫米）"><span>mm</span></div></div>
@@ -450,6 +451,11 @@
 				<div class="form-actions"><div id="signStatus" class="form-status" role="status" aria-live="polite"></div><button id="signCancel" class="button" type="button">取消</button><button class="button" type="submit" title="签署另存">签署</button></div>
 			</form>
 		</dialog>
+		<div hidden>
+			<div id="signPositionLayer" class="seal-position-layer" aria-hidden="true">
+				<div id="signPositionStamp" class="seal-position-stamp" hidden><img id="signPositionImage" alt="" draggable="false"></div>
+			</div>
+		</div>
 		<dialog id="verifyPanel" class="form-dialog security-dialog" aria-labelledby="verifyTitle">
 			<form id="verifyForm">
 				<h2 id="verifyTitle" class="form-title">验证签名</h2>

assets/webui/ofdgo.css

@@ -1041,6 +1041,43 @@ button:not(:disabled):hover {
 	height: 100%;
 }
 
+.seal-position-options,
+.seal-position-options label {
+	display: flex;
+	align-items: center;
+	gap: 12px;
+}
+
+.seal-picking .page-surface {
+	cursor: crosshair;
+	touch-action: none;
+}
+
+.seal-picking .edit-layer {
+	visibility: hidden;
+}
+
+.seal-position-layer {
+	position: absolute;
+	inset: 0;
+	z-index: 10;
+	pointer-events: none;
+	overflow: hidden;
+}
+
+.seal-position-stamp {
+	position: absolute;
+	overflow: hidden;
+	outline: 1px solid var(--accent);
+}
+
+.seal-position-stamp img {
+	position: absolute;
+	max-width: none;
+	height: 100%;
+	pointer-events: none;
+}
+
 .security-dialog {
 	width: 360px;
 }

assets/webui/ofdgo.js

@@ -1129,8 +1129,15 @@ el.signCancel.addEventListener("click", () => state.signing ? cancelSigning() :
 el.signPanel.addEventListener("cancel", event => {
 	if (state.signing) { event.preventDefault(); cancelSigning(); }
 });
-el.signPanel.addEventListener("close", () => { if (!el.signPanel.open) el.signForm.reset(); });
+el.signPanel.addEventListener("close", () => { if (!el.signPanel.open && !sealPreview) el.signForm.reset(); });
 el.signForm.addEventListener("submit", signDocument);
+const sealPosition = Object.fromEntries(["Layer", "Stamp", "Image"].map(name => [name, document.querySelector(`#signPosition${name}`)]));
+let sealPreview = null;
+document.querySelector("#signPick").addEventListener("click", openSealPosition);
+el.viewerPanel.addEventListener("pointerdown", beginSealDrag, true);
+el.viewerPanel.addEventListener("pointermove", moveSealDrag, true);
+el.viewerPanel.addEventListener("pointerup", confirmSealPosition, true);
+el.viewerPanel.addEventListener("pointercancel", () => { if (sealPreview) finishSealPosition(); }, true);
 el.verifyButton.addEventListener("click", () => {
 	if (!state.doc || document.body.hasAttribute("aria-busy")) return;
 	el.verifyForm.reset();
@@ -1343,6 +1350,10 @@ updateSidebarState();
 boot();
 
 function handleKeyDown(event) {
+	if (sealPreview) {
+		if (event.key === "Escape") { event.preventDefault(); finishSealPosition(); }
+		return;
+	}
 	if (event.defaultPrevented || event.isComposing || event.altKey) {
 		return;
 	}
@@ -1457,7 +1468,7 @@ function handleKeyDown(event) {
 }
 
 function formDialogOpen() {
-	return batchElements.Panel.open || el.exportPanel.open || el.createPanel.open || el.insertPanel.open || el.pagePanel.open || el.paragraphPanel.open || el.importPanel.open || el.infoPanel.open
+	return Boolean(sealPreview) || el.signPanel.open || el.verifyPanel.open || el.credentialsPanel.open || batchElements.Panel.open || el.exportPanel.open || el.createPanel.open || el.insertPanel.open || el.pagePanel.open || el.paragraphPanel.open || el.importPanel.open || el.infoPanel.open
 		|| el.batchPagesPanel.open || el.objectStylePanel.open || el.sourceTextPanel.open || el.outlinePanel.open || el.objectBoundsPanel.open || el.annotationNote.open || el.annotationCreate.open || el.objectPicker.open;
 }
 
@@ -3831,6 +3842,7 @@ function updateFontPermissionHint() {
 }
 
 function clearSecurityForms() {
+	if (sealPreview) finishSealPosition(false);
 	finishCredentials(null);
 	clearEncryptionForm();
 	el.signKey.value = "";
@@ -4248,11 +4260,134 @@ function cancelSigning() {
 	cancelExport();
 }
 
+function finishSealPosition(returnToForm = true) {
+	const preview = sealPreview;
+	if (!preview) return;
+	sealPreview = null;
+	if (preview.pointer != null && el.viewerPanel.hasPointerCapture(preview.pointer)) el.viewerPanel.releasePointerCapture(preview.pointer);
+	URL.revokeObjectURL(preview.url);
+	sealPosition.Layer.remove();
+	sealPosition.Image.removeAttribute("src");
+	el.viewerPanel.classList.remove("seal-picking");
+	canvasEditor.enabled = preview.enabled;
+	if (preview.sidebar && COMPACT_LAYOUT.matches) {
+		Object.assign(state, preview.sidebar);
+		updateSidebarState();
+	}
+	setBusy(document.body.hasAttribute("aria-busy"));
+	if (returnToForm && preview.sequence === state.openSeq && !el.signPanel.open) el.signPanel.showModal();
+	if (preview.sequence === state.openSeq) setStatus(preview.status);
+}
+
+async function openSealPosition() {
+	const file = el.signSeal.files?.[0];
+	if (!file || !state.doc || document.body.hasAttribute("aria-busy")) return;
+	const sequence = state.openSeq;
+	setBusy(true);
+	try {
+		const range = el.signPages.value.trim(), mode = el.signPlacement.value;
+		const selected = await callWASM("ofdgoParsePageRange", range);
+		if (mode === "seam" && selected.length < 2) throw new Error("骑缝签章至少选择两页");
+		const result = await callWASM("ofdgoPreviewSignatureSeal", new Uint8Array(await file.arrayBuffer()), `1-${state.doc.pageCount}`);
+		if (sequence !== state.openSeq || !el.signPanel.open || file !== el.signSeal.files?.[0]) return;
+		sealPreview = {pages:result.pages, selected, range, mode, ratio:document.querySelector("#signKeepRatio").checked ? result.width / result.height : 0, sequence, enabled:canvasEditor.enabled, status:el.statusText.textContent, url:URL.createObjectURL(new Blob([result.svg], {type:"image/svg+xml"}))};
+		sealPosition.Image.src = sealPreview.url;
+		await sealPosition.Image.decode();
+		if (sequence !== state.openSeq || !el.signPanel.open) { finishSealPosition(false); return; }
+		canvasEditor.enabled = false;
+		if (COMPACT_LAYOUT.matches) {
+			sealPreview.sidebar = {showPages:state.showPages, showMeta:state.showMeta};
+			state.showPages = state.showMeta = false;
+			updateSidebarState();
+		}
+		el.viewerPanel.classList.add("seal-picking");
+		el.signPanel.close();
+		el.signStatus.textContent = "";
+		setStatus("拖动选取签章区域，Esc 取消");
+		el.viewerPanel.focus({preventScroll:true});
+	} catch (error) { finishSealPosition(); el.signStatus.textContent = error.message; }
+	finally { if (sequence === state.openSeq) setBusy(false); }
+}
+
+function sealPointer(event) {
+	const preview = sealPreview;
+	const point = pagePoint(event.clientX, event.clientY, preview.surface.getBoundingClientRect(), preview.page, state.rotation);
+	return {x:preview.page.x + point.x, y:preview.page.y + point.y};
+}
+
+function beginSealDrag(event) {
+	const preview = sealPreview;
+	if (!preview || preview.confirming || event.button !== 0) return;
+	const surface = event.target.closest(".page-surface");
+	if (!surface) return;
+	event.preventDefault();
+	event.stopImmediatePropagation();
+	const index = Number(surface.closest(".page-shell").dataset.pageIndex);
+	if ((preview.mode === "seam" || preview.selected.length > 1) && !preview.selected.includes(index)) {
+		setStatus("请在所选页码范围内定位");
+		return;
+	}
+	preview.page = preview.pages[index];
+	preview.surface = surface;
+	preview.start = sealPointer(event);
+	preview.pointer = event.pointerId;
+	preview.box = null;
+	sealPosition.Stamp.hidden = true;
+	surface.append(sealPosition.Layer);
+	el.viewerPanel.setPointerCapture(event.pointerId);
+}
+
+function moveSealDrag(event) {
+	const preview = sealPreview;
+	if (!preview?.start || preview.pointer !== event.pointerId) return;
+	event.preventDefault();
+	event.stopImmediatePropagation();
+	const point = sealPointer(event), start = preview.start, page = preview.page;
+	const dx = point.x - start.x, dy = point.y - start.y;
+	let width = Math.abs(dx), height = Math.abs(dy);
+	const count = preview.mode === "seam" ? preview.selected.length : 1;
+	if (preview.ratio) {
+		width = Math.min(width, height * preview.ratio / count);
+		height = width * count / preview.ratio;
+	}
+	const x = dx < 0 ? start.x - width : start.x, y = dy < 0 ? start.y - height : start.y;
+	preview.box = {x:preview.mode === "seam" ? page.x + page.width - x - width : x, y, width:width * count, height};
+	sealPosition.Stamp.hidden = false;
+	Object.assign(sealPosition.Stamp.style, {left:`${(x-page.x)/page.width*100}%`, top:`${(y-page.y)/page.height*100}%`, width:`${width/page.width*100}%`, height:`${height/page.height*100}%`});
+	Object.assign(sealPosition.Image.style, {width:`${count*100}%`, left:`${preview.mode === "seam" ? -preview.selected.indexOf(page.index)*100 : 0}%`});
+}
+
+async function confirmSealPosition(event) {
+	const preview = sealPreview;
+	if (!preview?.start || preview.pointer !== event.pointerId || preview.confirming) return;
+	moveSealDrag(event);
+	preview.start = null;
+	el.viewerPanel.releasePointerCapture(event.pointerId);
+	const box = preview.box;
+	if (!box || box.width < 0.01 || box.height < 0.01) { sealPosition.Layer.remove(); return; }
+	preview.confirming = true;
+	const range = preview.mode === "normal" && preview.selected.length === 1 ? String(preview.page.index + 1) : preview.range;
+	try {
+		await callWASM("ofdgoSignaturePlacement", {...box, pages:range, placement:preview.mode});
+		if (sealPreview !== preview || preview.sequence !== state.openSeq) return;
+		el.signPages.value = range;
+		for (const [name, key] of [["X", "x"], ["Y", "y"], ["Width", "width"], ["Height", "height"]]) el[`sign${name}`].value = String(box[key]);
+		finishSealPosition();
+	} catch (error) {
+		if (sealPreview === preview) { finishSealPosition(); el.signStatus.textContent = error.message; }
+	}
+}
+
 function updateSignPlacement() {
 	const stamp = Boolean(el.signSeal.files?.length);
 	el.signPlacementFields.hidden = !stamp;
-	el.signPages.required = stamp;
+	el.signPlacement.disabled = !stamp;
-	el.signX.disabled = !stamp || el.signPlacement.value === "seam";
+	for (const input of [el.signPages, el.signX, el.signY, el.signWidth, el.signHeight]) {
+		input.disabled = !stamp;
+		input.required = stamp;
+	}
+	document.querySelector('label[for="signX"]').textContent = el.signPlacement.value === "seam" ? "右侧内缩" : "横坐标";
+	el.signX.setAttribute("aria-label", el.signPlacement.value === "seam" ? "右侧内缩（毫米）" : "横坐标（毫米）");
 }
 
 async function signDocument(event) {
@@ -5637,6 +5772,7 @@ async function pasteEditorContent(event) {
 }
 
 function copySelection(event) {
+	if (sealPreview) return;
 	if (event.target.closest?.("input, textarea, [contenteditable]")) {
 		return;
 	}
@@ -7580,7 +7716,7 @@ function updateEditorTools() {
 	const moveDisabled = selectionDisabled || selectedPages.some(index => !pageCan("move", index));
 	el.movePagePrevButton.disabled = moveDisabled || selectedPages[0] === 0;
 	el.movePageNextButton.disabled = moveDisabled || selectedPages.at(-1) === state.doc?.pageCount - 1;
-	const enabled = state.editing && state.selectObjects && !state.panMode;
+	const enabled = state.editing && state.selectObjects && !state.panMode && !sealPreview;
 	canvasEditor.setEnabled(enabled);
 	updateObjectControls(canvasEditor.selected);
 	el.undoButton.disabled = !state.editorInfo?.canUndo || !state.ready || state.exporting;
@@ -7728,7 +7864,7 @@ function setBusy(busy, text = "", percent = 0, status = "") {
 	document.body.toggleAttribute("aria-busy", busy);
 	renderSecurity();
 	updateDisplayControls();
-	el.editButton.disabled = busy || !state.doc || !state.ready || state.exporting;
+	el.editButton.disabled = busy || Boolean(sealPreview) || !state.doc || !state.ready || state.exporting;
 	el.createForm.inert = busy;
 	el.insertForm.inert = busy;
 	el.pageForm.inert = busy;
@@ -7746,7 +7882,7 @@ function setBusy(busy, text = "", percent = 0, status = "") {
 	el.outlineList.inert = busy;
 	el.navigationTabs.inert = busy;
 	el.pageList.inert = busy;
-	el.editorTools.inert = busy;
+	el.editorTools.inert = busy || Boolean(sealPreview);
 	el.fontList.inert = busy;
 	if (!busy) {
 		el.progressPanel.hidden = true;

go.mod

@@ -9,7 +9,7 @@ require (
 	github.com/tdewolff/canvas v0.0.0-20260923214215-09804640d00c
 	github.com/tdewolff/font v0.0.0-20260913163313-54f98bb59ee6
 	github.com/xiaoqidun/jbig2 v1.1.1
-	github.com/xiaoqidun/pdfgo v0.0.0-20260927142759-12ed20917f60
+	github.com/xiaoqidun/pdfgo v0.0.0-20260927150509-ae8390858589
 	golang.org/x/crypto v0.57.0
 	golang.org/x/image v0.46.0
 	golang.org/x/text v0.42.0

go.sum

@@ -62,8 +62,8 @@ github.com/tdewolff/test v1.0.12 h1:7F21DqIajswxuche0geHdrUZRCWE4oko4b7bcmkkrxk=
 github.com/tdewolff/test v1.0.12/go.mod h1:XPuWBzvdUzhCuxWO1ojpXsyzsA5bFoS3tO/Q3kFuTG8=
 github.com/xiaoqidun/jbig2 v1.1.1 h1:SjliS9ZO0e9HX5oYUfBuXrfFsXhWricrSz+XY4zORDI=
 github.com/xiaoqidun/jbig2 v1.1.1/go.mod h1:8QonVWtENmh2kc6l+leqeGl7psb79DWlHDkCpdChjfQ=
-github.com/xiaoqidun/pdfgo v0.0.0-20260927142759-12ed20917f60 h1:0JC6RK3DMb11RIVoaSSlprHo9oAZb+YyfUThEsTs0Bk=
+github.com/xiaoqidun/pdfgo v0.0.0-20260927150509-ae8390858589 h1:dHH5wnrIyOKRpx3Dw4IiMgMEPMrNFdatfkoMKpX3Khk=
-github.com/xiaoqidun/pdfgo v0.0.0-20260927142759-12ed20917f60/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
+github.com/xiaoqidun/pdfgo v0.0.0-20260927150509-ae8390858589/go.mod h1:4Pf0JO0BEf1uzRY+uZjlMjN/OPn3PYa0YMi6cqPPTLQ=
 github.com/xyproto/randomstring v1.0.5 h1:YtlWPoRdgMu3NZtP45drfy1GKoojuR7hmRcnhZqKjWU=
 github.com/xyproto/randomstring v1.0.5/go.mod h1:rgmS5DeNXLivK7YprL0pY+lTuhNQW3iGxZ18UQApw/E=
 github.com/yuin/goldmark v1.8.5 h1:r6N5afV5qj/5S4UTch8agZHJ8UxNCMwX7WjkkJam2NA=

internal/webui/wasm.go

@@ -286,6 +286,8 @@ func RunWASM() {
 	registerAsyncCallback("ofdgoSaveDocument", saveDocument)
 	registerAsyncCallback("ofdgoSaveEncrypted", saveEncrypted)
 	registerAsyncCallback("ofdgoSaveSigned", saveSigned)
+	registerCallback("ofdgoPreviewSignatureSeal", previewSignatureSeal)
+	registerCallback("ofdgoSignaturePlacement", signaturePlacement)
 	select {}
 }
 
@@ -4148,6 +4150,105 @@ func saveEncrypted(args []js.Value) (any, error) {
 	return saveEditor(editor, args[1:])
 }
 
+// previewSignatureSeal 渲染独立印章预览并读取所选页面区域，不接触私钥或修改文档
+// 入参: args 印章数据和页码范围
+// 返回: any 印章图像、声明尺寸和页面区域, error 错误信息
+func previewSignatureSeal(args []js.Value) (any, error) {
+	if currentSession == nil || len(args) < 2 {
+		return nil, fmt.Errorf("missing seal preview arguments")
+	}
+	data, err := bytesFromJS(args[0])
+	if err != nil {
+		return nil, err
+	}
+	seal, err := ofdgo.ParseSignatureSeal(data)
+	if err != nil {
+		return nil, err
+	}
+	indices, err := ofdgo.ParsePageRange(args[1].String(), len(currentSession.doc.Pages.Page))
+	if err != nil {
+		return nil, err
+	}
+	pages := make([]map[string]any, 0, len(indices))
+	for _, index := range indices {
+		area, err := currentSession.Reader.PageArea(currentSession.doc.Pages.Page[index])
+		if err != nil {
+			return nil, err
+		}
+		box, err := ofdgo.ParseBox(area.PhysicalBox)
+		if err != nil {
+			return nil, err
+		}
+		pages = append(pages, map[string]any{"index": index, "x": box.X, "y": box.Y, "width": box.W, "height": box.H})
+	}
+	editor := ofdgo.NewEditor()
+	if _, err := editor.AddPage(seal.Width, seal.Height); err != nil {
+		return nil, err
+	}
+	reader, err := editor.Reader()
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	doc, err := reader.Doc()
+	if err != nil {
+		return nil, err
+	}
+	reader.Stamps = map[string][]ofdgo.Stamp{doc.Pages.Page[0].ID: {{Box: ofdgo.Box{W: seal.Width, H: seal.Height}, Type: seal.Type, Data: seal.Data}}}
+	renderer := ofdgo.NewRenderer(reader, ofdgo.WithRenderBackends(currentSession.Renderer.Backends()))
+	renderer.TransparentBackground = true
+	if currentSession.fontFS != nil {
+		renderer.SetFontFS(currentSession.fontFS)
+	}
+	page, err := reader.PageContentByIndex(0)
+	if err != nil {
+		return nil, err
+	}
+	var svg bytes.Buffer
+	if err := renderer.RenderToSVG(page, &svg); err != nil {
+		return nil, err
+	}
+	return map[string]any{"svg": svg.String(), "width": seal.Width, "height": seal.Height, "pages": pages}, nil
+}
+
+// signatureStampsFromJS 复用库层坐标校验生成页面或骑缝印章位置
+// 入参: input 页面和毫米坐标参数
+// 返回: []ofdgo.SignatureStamp 印章位置, error 校验错误
+func signatureStampsFromJS(input js.Value) ([]ofdgo.SignatureStamp, error) {
+	count, err := currentSession.Reader.PageCount()
+	if err != nil {
+		return nil, err
+	}
+	indices, err := ofdgo.ParsePageRange(input.Get("pages").String(), count)
+	if err != nil {
+		return nil, err
+	}
+	pages := make([]int, len(indices))
+	for i, index := range indices {
+		pages[i] = index + 1
+	}
+	box := ofdgo.Box{X: input.Get("x").Float(), Y: input.Get("y").Float(), W: input.Get("width").Float(), H: input.Get("height").Float()}
+	switch input.Get("placement").String() {
+	case "normal":
+		return currentSession.Reader.SignaturePageStamps(pages, box)
+	case "seam":
+		return currentSession.Reader.SignatureSeamStamps(pages, box)
+	default:
+		return nil, fmt.Errorf("invalid stamp placement")
+	}
+}
+
+// signaturePlacement 校验预览确认的印章范围，不生成签名
+// 入参: args 页面和毫米坐标参数
+// 返回: any 校验结果, error 错误信息
+func signaturePlacement(args []js.Value) (any, error) {
+	if currentSession == nil || len(args) == 0 {
+		return nil, fmt.Errorf("missing stamp placement arguments")
+	}
+	_, err := signatureStampsFromJS(args[0])
+	return successResult(nil), err
+}
+
 // saveSigned 调用库层最终包签署并在回验成功后交付浏览器
 // 入参: args 本机证书私钥、信任根、印章位置、写出回调及进度回调
 // 返回: any 保存结果, error 错误信息
@@ -4200,30 +4301,10 @@ func saveSigned(args []js.Value) (any, error) {
 		if err != nil {
 			return nil, err
 		}
-		count, err := currentSession.Reader.PageCount()
+		options.Stamps, err = signatureStampsFromJS(input)
 		if err != nil {
 			return nil, err
 		}
-		indices, err := ofdgo.ParsePageRange(input.Get("pages").String(), count)
-		if err != nil {
-			return nil, err
-		}
-		box := ofdgo.Box{X: input.Get("x").Float(), Y: input.Get("y").Float(), W: input.Get("width").Float(), H: input.Get("height").Float()}
-		if input.Get("placement").String() == "seam" {
-			pages := make([]int, len(indices))
-			for i, index := range indices {
-				pages[i] = index + 1
-			}
-			options.Stamps, err = currentSession.Reader.SignatureSeamStamps(pages, box)
-			if err != nil {
-				return nil, err
-			}
-		} else {
-			for _, index := range indices {
-				options.Stamps = append(options.Stamps, ofdgo.SignatureStamp{PageRef: currentSession.doc.Pages.Page[index].ID,
-					Boundary: fmt.Sprintf("%g %g %g %g", box.X, box.Y, box.W, box.H)})
-			}
-		}
 	}
 	progress := editorOperationProgress(args[2])
 	if err := progress("sign", 0, 1); err != nil {

ofdgo_annot.go

@@ -48,9 +48,21 @@ type Annotation struct {
 	NoZoom      bool                  `xml:"NoZoom,attr"`
 	NoRotate    bool                  `xml:"NoRotate,attr"`
 	Remark      string                `xml:"Remark"`
+	Parameters  *AnnotationParameters `xml:"Parameters,omitempty"`
 	Appearance  Appearance
 }
 
+// AnnotationParameters 保存注释参数集合
+type AnnotationParameters struct {
+	Parameter []AnnotationParameter `xml:"Parameter"`
+}
+
+// AnnotationParameter 保存标准注释参数的名称和值
+type AnnotationParameter struct {
+	Name  string `xml:"Name,attr"`
+	Value string `xml:",chardata"`
+}
+
 // AnnotationInfo 注释信息，Page从1开始，位置和尺寸使用页面毫米坐标
 type AnnotationInfo struct {
 	ID          string  `json:"id"`

ofdgo_editor_annot_content.go

@@ -96,6 +96,28 @@ func (e *Editor) AddAnnotation(index int, annotation Annotation) (string, error)
 		if annotation.Remark != "" {
 			content = editorXMLText("Remark", annotation.Remark)
 		}
+		if annotation.Parameters != nil && len(annotation.Parameters.Parameter) != 0 {
+			var parameters []byte
+			for _, parameter := range annotation.Parameters.Parameter {
+				if parameter.Name == "" {
+					return fmt.Errorf("empty annotation parameter name")
+				}
+				var value bytes.Buffer
+				if err := xml.EscapeText(&value, []byte(parameter.Value)); err != nil {
+					return err
+				}
+				data, err := editorXMLContainer("Parameter", ofdAttrs{{Name: xml.Name{Local: "Name"}, Value: parameter.Name}}, value.Bytes())
+				if err != nil {
+					return err
+				}
+				parameters = append(parameters, bytes.TrimPrefix(data, []byte(xml.Header))...)
+			}
+			data, err := editorXMLContainer("Parameters", nil, parameters)
+			if err != nil {
+				return err
+			}
+			content = append(content, bytes.TrimPrefix(data, []byte(xml.Header))...)
+		}
 		content = append(content, bytes.TrimPrefix(appearance, []byte(xml.Header))...)
 		data, err := editorXMLContainer("Annot", attrs, content)
 		if err != nil {

ofdgo_pdf_annot.go

@@ -112,6 +112,20 @@ func (p *pdfImporter) appearanceAnnotation(ctx context.Context, page *pdfgo.Page
 		p.report.Warnings = append(p.report.Warnings, pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF darken stamp appearance flattened over page content"})
 	}
 	converted := Annotation{Type: pdfAnnotationType(annotation.Subtype), Subtype: string(annotation.Subtype), Appearance: Appearance{Boundary: pdfBoundary(box), Objects: stamp.objects}}
+	popupObject := annotation.Dictionary["Popup"]
+	if annotation.Subtype == "Popup" {
+		popupObject = annotation.Dictionary
+	}
+	if popupObject != nil {
+		popup, err := p.reader.ReadPopupAnnotation(popupObject)
+		if err != nil {
+			return err
+		}
+		converted.Parameters = &AnnotationParameters{Parameter: []AnnotationParameter{
+			{Name: "PDF.Popup.Open", Value: strconv.FormatBool(popup.Open)},
+			{Name: "PDF.Popup.Rect", Value: fmt.Sprintf("%g %g %g %g", popup.Rect.XMin, popup.Rect.YMin, popup.Rect.XMax, popup.Rect.YMax)},
+		}}
+	}
 	if len(actions) != 0 {
 		region, err := NewShape(ShapeRectangle, Box{W: box.W, H: box.H})
 		if err != nil {
@@ -220,7 +234,7 @@ func pdfAnnotationType(subtype pdfgo.Name) string {
 		return "Watermark"
 	case "Highlight", "Underline", "Squiggly", "StrikeOut":
 		return "Highlight"
-	case "Text", "FreeText", "Line", "Square", "Circle", "Polygon", "PolyLine", "Caret", "Ink", "FileAttachment", "Sound", "Movie", "Screen", "Link":
+	case "Text", "FreeText", "Line", "Square", "Circle", "Polygon", "PolyLine", "Caret", "Ink", "FileAttachment", "Sound", "Movie", "Screen", "Link", "Popup":
 		return "Path"
 	}
 	return ""

ofdgo_pdf_link.go

@@ -18,6 +18,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"maps"
 
 	"github.com/xiaoqidun/pdfgo"
 )
@@ -30,8 +31,59 @@ func (p *pdfImporter) annotations(ctx context.Context, page *pdfgo.Page, strict
 	if err != nil {
 		return err
 	}
-	for _, annotation := range annotations {
+	parents := make(map[pdfgo.Reference]int)
+	for i, annotation := range annotations {
+		if annotation.Reference != (pdfgo.Reference{}) && annotation.Subtype != "Popup" {
+			parents[annotation.Reference] = i
+		}
+	}
+	attached := make(map[int]bool)
+	for i, annotation := range annotations {
+		if annotation.Subtype != "Popup" {
+			continue
+		}
+		popup, err := p.reader.ReadPopupAnnotation(annotation.Dictionary)
+		if err != nil {
+			return err
+		}
+		if parent, ok := parents[popup.Parent]; ok {
+			dict := maps.Clone(annotations[parent].Dictionary)
+			if previous := dict["Popup"]; previous != nil {
+				if reference, ok := previous.(pdfgo.Reference); !ok || reference != annotation.Reference {
+					return fmt.Errorf("inconsistent PDF popup parent")
+				}
+			}
+			dict["Popup"] = annotation.Dictionary
+			annotations[parent].Dictionary = dict
+			attached[i] = true
+		} else {
+			annotations[i].Dictionary = popup.Dictionary
+		}
+	}
+	for i, annotation := range annotations {
+		if attached[i] {
+			continue
+		}
 		dict := annotation.Dictionary
+		popupObject := dict["Popup"]
+		if annotation.Subtype == "Popup" {
+			popupObject = dict
+		}
+		if popupObject != nil {
+			popup, err := p.reader.ReadPopupAnnotation(popupObject)
+			if err != nil {
+				return err
+			}
+			if annotation.Subtype != "Popup" && popup.Parent != (pdfgo.Reference{}) && popup.Parent != annotation.Reference {
+				return fmt.Errorf("inconsistent PDF popup parent")
+			}
+			if popup.Open {
+				if strict {
+					return &pdfgo.UnsupportedError{Feature: "initially open annotation popup"}
+				}
+				p.warning(pdfgo.Diagnostic{Page: p.page + 1, Message: "PDF popup open state retained as annotation parameter"})
+			}
+		}
 		if annotation.Subtype == "Sound" {
 			sound, err := p.reader.ReadSound(dict["Sound"])
 			if err != nil {

ofdgo_sign_ses.go

@@ -36,6 +36,46 @@ const (
 	signASN1Sequence   = 16
 )
 
+// ParsedSignatureSeal 保存电子印章声明信息、图像和毫米尺寸，不代表验签或信任结果
+type ParsedSignatureSeal struct {
+	Info   SignatureSealInfo
+	Type   string
+	Data   []byte
+	Width  float64
+	Height float64
+}
+
+// ParseSignatureSeal 解析独立SES印章供展示使用，不验证授权、有效期或制章者信任
+// 入参: data DER编码的电子印章
+// 返回: *ParsedSignatureSeal 印章信息及独立图像副本, error 解析错误
+func ParseSignatureSeal(data []byte) (*ParsedSignatureSeal, error) {
+	var raw asn1.RawValue
+	rest, err := asn1.Unmarshal(data, &raw)
+	if err != nil || len(rest) != 0 || raw.Tag != asn1.TagSequence || raw.Class != asn1.ClassUniversal {
+		return nil, fmt.Errorf("invalid SES seal DER")
+	}
+	seal, err := parseSESSeal(raw)
+	if err != nil {
+		return nil, err
+	}
+	items, _ := asn1Children(raw.Bytes)
+	info, _ := asn1Children(items[0].Bytes)
+	picture, _ := asn1Children(info[3].Bytes)
+	width, err := asn1Integer(picture[2])
+	if err != nil || width <= 0 {
+		return nil, fmt.Errorf("invalid seal picture width")
+	}
+	height, err := asn1Integer(picture[3])
+	if err != nil || height <= 0 {
+		return nil, fmt.Errorf("invalid seal picture height")
+	}
+	format, image := probeSealMedia(seal.PicData)
+	if len(image) == 0 || format != seal.PicType {
+		return nil, fmt.Errorf("invalid seal picture")
+	}
+	return &ParsedSignatureSeal{Info: seal.Info, Type: format, Data: append([]byte(nil), image...), Width: float64(width), Height: float64(height)}, nil
+}
+
 // sesSignature SES签章值
 type sesSignature struct {
 	Timestamp []byte

ofdgo_sign_write_stamp.go

@@ -21,6 +21,29 @@ import (
 	"strings"
 )
 
+// SignaturePageStamps 生成所选页面相同毫米坐标的印章位置并检查页内范围
+// 入参: pages 从1开始且不重复的页码, box 完整印章区域
+// 返回: []SignatureStamp 可传入签署选项的位置, error 错误信息
+func (r *Reader) SignaturePageStamps(pages []int, box Box) ([]SignatureStamp, error) {
+	if r == nil || len(pages) == 0 || !signatureWriteBoxValid(box) {
+		return nil, fmt.Errorf("invalid page stamp parameters")
+	}
+	doc, err := r.Doc()
+	if err != nil {
+		return nil, err
+	}
+	seen := make(map[int]bool)
+	stamps := make([]SignatureStamp, 0, len(pages))
+	for _, page := range pages {
+		if page < 1 || page > len(doc.Pages.Page) || seen[page] {
+			return nil, fmt.Errorf("invalid stamp page: %d", page)
+		}
+		seen[page] = true
+		stamps = append(stamps, SignatureStamp{PageRef: doc.Pages.Page[page-1].ID, Boundary: signatureWriteBox(box)})
+	}
+	return signatureWriteStamps(r, stamps, true)
+}
+
 // SignatureSeamStamps 生成页面右侧的等宽骑缝印章位置
 // 页码从1开始，按传入顺序分割同一印章；box.X为右侧内缩，Y为纵坐标，W/H为完整印章尺寸
 // 入参: pages 至少两页且不重复, box 印章参数，单位毫米