feat(编辑阅读): 完善保真编辑与跨文档复制，优化后端缓存和大文件性能

assets/webui/index.html

@@ -183,6 +183,12 @@
 			<form id="objectStyleForm">
 				<div class="form-row"><span>组合</span><div class="form-format"><button id="groupObjectsButton" class="button" type="button">组合</button><button id="ungroupObjectButton" class="button" type="button">解组</button></div></div>
 				<div class="form-row"><span>格式</span><div class="form-format"><button id="copyStyleButton" class="button" type="button" aria-label="复制格式">复制</button><button id="pasteStyleButton" class="button" type="button" aria-label="粘贴格式">粘贴</button></div></div>
+				<details id="objectLinkFields" hidden>
+					<summary>链接</summary>
+					<div class="form-row"><label for="objectLinkKind">目标</label><select id="objectLinkKind"><option value="none">不设</option><option value="uri">网址</option><option value="page">页面</option><option value="keep">原有</option></select></div>
+					<div class="form-row" id="objectLinkAddressRow" hidden><label for="objectLinkAddress">地址</label><input id="objectLinkAddress" type="text"></div>
+					<div class="form-row" id="objectLinkPageRow" hidden><label for="objectLinkPage">页码</label><input id="objectLinkPage" type="number" min="1" step="1"></div>
+				</details>
 				<div class="form-row"><label for="objectOpacity">透明</label><div class="form-unit"><input id="objectOpacity" type="number" min="0" max="100" step="any" aria-label="透明度" autofocus><span>%</span></div></div>
 				<details id="objectBorderFields" hidden>
 					<summary>边框</summary>
@@ -342,6 +348,14 @@
 		<dialog id="objectPicker" class="form-dialog" aria-label="选取对象">
 			<form method="dialog"><div id="objectPickerList" class="object-picker-list"></div><div class="form-actions"><button class="button" type="submit">关闭</button></div></form>
 		</dialog>
+		<dialog id="sourceTextPanel" class="form-dialog" aria-label="保留排版">
+			<form id="sourceTextForm">
+				<h2 class="form-title">保留排版</h2>
+				<div class="form-row"><label for="sourceTextValue">内容</label><textarea id="sourceTextValue" rows="3" dir="auto" aria-label="文字内容" required></textarea></div>
+				<div id="sourceTextPreview" aria-label="文字预览"></div>
+				<div class="form-actions"><span id="sourceTextStatus" class="form-status" role="status"></span><button id="sourceTextCancel" class="button" type="button">取消</button><button class="button primary" type="submit">确定</button></div>
+			</form>
+		</dialog>
 		<dialog id="annotationNote" class="form-dialog" aria-label="注解">
 			<form id="annotationForm" method="dialog">
 				<div id="annotationDetail" class="annotation-detail"></div>

assets/webui/ofdgo.css

@@ -692,6 +692,27 @@ button:not(:disabled):hover {
 	line-height: 1.5;
 }
 
+#sourceTextPanel {
+	width: 440px;
+}
+
+#sourceTextValue {
+	min-height: 80px;
+}
+
+#sourceTextPreview {
+	height: 160px;
+	margin-top: 12px;
+	background: #fff;
+	overflow: hidden;
+}
+
+#sourceTextPreview svg {
+	display: block;
+	width: 100%;
+	height: 100%;
+}
+
 .security-dialog {
 	width: 360px;
 }

assets/webui/ofdgo.js

@@ -284,10 +284,22 @@ const el = {
 	objectHeight: document.querySelector("#objectHeight"),
 	objectAspect: document.querySelector("#objectAspect"),
 	objectStylePanel: document.querySelector("#objectStylePanel"),
+	sourceTextPanel: document.querySelector("#sourceTextPanel"),
+	sourceTextForm: document.querySelector("#sourceTextForm"),
+	sourceTextValue: document.querySelector("#sourceTextValue"),
+	sourceTextPreview: document.querySelector("#sourceTextPreview"),
+	sourceTextStatus: document.querySelector("#sourceTextStatus"),
+	sourceTextCancel: document.querySelector("#sourceTextCancel"),
 	objectStyleForm: document.querySelector("#objectStyleForm"),
 	groupObjectsButton: document.querySelector("#groupObjectsButton"),
 	ungroupObjectButton: document.querySelector("#ungroupObjectButton"),
 	objectOpacity: document.querySelector("#objectOpacity"),
+	objectLinkFields: document.querySelector("#objectLinkFields"),
+	objectLinkKind: document.querySelector("#objectLinkKind"),
+	objectLinkAddress: document.querySelector("#objectLinkAddress"),
+	objectLinkPage: document.querySelector("#objectLinkPage"),
+	objectLinkAddressRow: document.querySelector("#objectLinkAddressRow"),
+	objectLinkPageRow: document.querySelector("#objectLinkPageRow"),
 	objectGradientFields: document.querySelector("#objectGradientFields"),
 	gradientTarget: document.querySelector("#gradientTarget"),
 	objectBorderFields: document.querySelector("#objectBorderFields"),
@@ -997,6 +1009,23 @@ el.objectBoundsForm.addEventListener("submit", async event => {
 	if (saved) el.objectBoundsPanel.close();
 });
 el.objectStyleCancel.addEventListener("click", () => el.objectStylePanel.close());
+el.sourceTextCancel.addEventListener("click", () => el.sourceTextPanel.close());
+el.sourceTextValue.addEventListener("input", () => {
+	clearTimeout(state.sourceTextTimer);
+	state.sourceTextTimer = setTimeout(previewPositionedText, 150);
+});
+el.sourceTextPanel.addEventListener("close", () => {
+	clearTimeout(state.sourceTextTimer);
+	state.sourceText = null;
+	el.sourceTextPreview.replaceChildren();
+});
+el.sourceTextForm.addEventListener("submit", async event => {
+	event.preventDefault();
+	const item = state.sourceText?.item;
+	if (!item) return;
+	if (await changeDocument("ofdgoUpdateText", item, el.sourceTextValue.value, null, item.size, null)) el.sourceTextPanel.close();
+});
+el.objectLinkKind.addEventListener("change", updateObjectLinkFields);
 el.gradientKind.addEventListener("change", () => {
 	el.gradientControls.hidden = el.gradientKind.value === "keep";
 	el.gradientAngle.disabled = el.gradientKind.value !== "linear";
@@ -1410,7 +1439,7 @@ function handleKeyDown(event) {
 
 function formDialogOpen() {
 	return 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.outlinePanel.open || el.objectBoundsPanel.open || el.annotationNote.open || el.annotationCreate.open || el.objectPicker.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;
 }
 
 function setObjectDimension(input, value) {
@@ -1458,6 +1487,16 @@ function openObjectStyle() {
 	el.copyStyleButton.disabled = items.length !== 1 || !canCopyStyle(items[0]);
 	el.pasteStyleButton.disabled = !state.styleClipboard || !items.every(item => item.type === state.styleClipboard && canCopyStyle(item));
 	const shared = (key, fallback) => items.every(item => (item[key] ?? fallback) === (items[0][key] ?? fallback)) ? items[0][key] ?? fallback : null;
+	el.objectLinkFields.hidden = items.length !== 1 || items[0].scoped;
+	const link = items[0].link ? JSON.parse(items[0].link) : null;
+	const targetPage = link?.Goto?.Dest ? state.doc.pages.findIndex(page => page.id === link.Goto.Dest.PageID) : -1;
+	el.objectLinkKind.value = items[0].linkCount > 1 ? "keep" : link?.URI ? "uri" : targetPage >= 0 ? "page" : link ? "keep" : "none";
+	el.objectLinkKind.disabled = items[0].linkCount > 1;
+	el.objectLinkAddress.value = link?.URI?.URI || "";
+	el.objectLinkPage.value = String(targetPage >= 0 ? targetPage + 1 : 1);
+	el.objectLinkPage.max = String(state.doc?.pages.length || 1);
+	state.objectLinkOriginal = { kind: el.objectLinkKind.value, address: el.objectLinkAddress.value, page: el.objectLinkPage.value, link };
+	updateObjectLinkFields();
 	el.objectBorderFields.hidden = items.length !== 1 || items[0].scoped || items[0].type !== "ImageObject";
 	const border = items[0].borderStyle ? JSON.parse(items[0].borderStyle) : null;
 	el.borderEnabled.checked = Boolean(border);
@@ -1517,6 +1556,14 @@ function openObjectStyle() {
 
 function readObjectStyle() {
 	const style = {}, changed = key => el[key].value !== state.styleOriginal[key];
+	if (!el.objectLinkFields.hidden) {
+		const original = state.objectLinkOriginal, kind = el.objectLinkKind.value;
+		if (kind !== "keep" && (kind !== original.kind || kind === "uri" && el.objectLinkAddress.value !== original.address || kind === "page" && el.objectLinkPage.value !== original.page)) {
+			style.link = kind === "none" ? null : JSON.stringify(kind === "uri"
+				? { URI: { ...original.link?.URI, URI: el.objectLinkAddress.value.trim() } }
+				: { Dest: { ...(original.link?.Goto?.Dest || { Type: "Fit" }), PageID: state.doc.pages[Number(el.objectLinkPage.value) - 1].id } });
+		}
+	}
 	if (!el.objectBorderFields.hidden) {
 		const border = {};
 		if (el.borderEnabled.checked !== state.borderOriginal.Enabled) border.Enabled = el.borderEnabled.checked;
@@ -1587,6 +1634,16 @@ function readObjectStyle() {
 	return style;
 }
 
+function updateObjectLinkFields() {
+	const kind = el.objectLinkKind.value, visible = !el.objectLinkFields.hidden;
+	el.objectLinkAddressRow.hidden = !visible || kind !== "uri";
+	el.objectLinkPageRow.hidden = !visible || kind !== "page";
+	el.objectLinkAddress.disabled = el.objectLinkAddressRow.hidden;
+	el.objectLinkPage.disabled = el.objectLinkPageRow.hidden;
+	el.objectLinkAddress.required = visible && kind === "uri";
+	el.objectLinkPage.required = visible && kind === "page";
+}
+
 function gradientForm() {
 	return {
 		kind: el.gradientKind.value, angle: el.gradientAngle.value,
@@ -2084,7 +2141,18 @@ async function editCanvasObject(item) {
 		return;
 	}
 	if (item.type === "TextObject") {
-		if (!canEditObject(item, "textContent")) return;
+		if (!canEditObject(item, "textContent")) {
+			if (!item.scoped && canEditObject(item, "rewriteText")) {
+				state.sourceText = { item, openSeq: state.openSeq };
+				el.sourceTextValue.value = item.text;
+				el.sourceTextStatus.textContent = "";
+				el.sourceTextPreview.replaceChildren();
+				el.sourceTextPanel.showModal();
+				el.sourceTextValue.focus();
+				await previewPositionedText();
+			}
+			return;
+		}
 	} else if (!canEditObject(item, item.type === "ImageObject" ? "replaceImage" : "update")) return;
 	if (item.type === "PathObject") {
 		el.shapeWidth.focus();
@@ -2114,6 +2182,22 @@ async function editCanvasObject(item) {
 	}
 }
 
+async function previewPositionedText() {
+	const request = state.sourceText, value = el.sourceTextValue.value;
+	if (!request || !el.sourceTextPanel.open) return;
+	try {
+		const svg = await callWASM("ofdgoPreviewPositionedText", request.item.index, request.item.id, value);
+		if (state.sourceText !== request || request.openSeq !== state.openSeq || el.sourceTextValue.value !== value) return;
+		el.sourceTextPreview.replaceChildren(parseSVG(svg));
+		el.sourceTextStatus.textContent = "";
+	} catch (error) {
+		if (state.sourceText === request && request.openSeq === state.openSeq && el.sourceTextValue.value === value) {
+			el.sourceTextPreview.replaceChildren();
+			el.sourceTextStatus.textContent = error.message;
+		}
+	}
+}
+
 function mountEditorObjects(index, page, surface) {
 	const scope = state.composite?.index === index ? state.composite : null;
 	canvasEditor.mount(index, { ...page, objects: scope ? scope.objects : page.objects.filter(item => state.renderAnnotations || item.type !== "Annotation") }, surface);
@@ -2714,6 +2798,8 @@ async function changeDocument(name, item, ...args) {
 				el.batchPagesStatus.textContent = err.message;
 			} else if (el.objectStylePanel.open) {
 				el.objectStyleStatus.textContent = err.message;
+			} else if (el.sourceTextPanel.open) {
+				el.sourceTextStatus.textContent = err.message;
 			} else if (el.objectBoundsPanel.open) {
 				el.objectBoundsStatus.textContent = err.message;
 			} else if (el.outlinePanel.open) {
@@ -3275,6 +3361,7 @@ async function openOFD(file) {
 		el.importPanel.close();
 		el.batchPagesPanel.close();
 		el.objectStylePanel.close();
+		el.sourceTextPanel.close();
 		el.objectBoundsPanel.close();
 		el.outlinePanel.close();
 		updateControls();
@@ -7077,7 +7164,7 @@ function updateObjectControls(item, reset = false) {
 	el.resetCropButton.disabled = canEditObject(item, "resetCrop") ? disabled : el.cropImageButton.disabled || !cropping && (item.scoped ? !item.cropped : !item.imageBounds || ["x", "y", "width", "height"].every(key => Math.abs(item[key] - item.imageBounds[key]) < 1e-9));
 	el.objectDistribute.disabled = el.objectAlign.disabled || !item.items || item.items.length < 3;
 	el.editObjectButton.disabled = disabled || Boolean(item.items) || !canEditObject(item, "enter") && (item.type === "PathObject"
-		|| !canEditObject(item, item.type === "TextObject" ? "textContent" : item.type === "ImageObject" ? "replaceImage" : "update"));
+		|| !(item.type === "TextObject" && !item.scoped && canEditObject(item, "rewriteText")) && !canEditObject(item, item.type === "TextObject" ? "textContent" : item.type === "ImageObject" ? "replaceImage" : "update"));
 	el.editObjectButton.textContent = canEditObject(item, "enter") ? "进入" : item?.type === "ImageObject" ? "替换" : "修改";
 	el.editObjectButton.title = canEditObject(item, "enter") ? item?.type === "Annotation" ? "进入注解" : "进入组合" : item?.type === "ImageObject" ? "替换图片" : item?.type === "Annotation" ? "修改注解" : "修改对象";
 	el.editObjectButton.setAttribute("aria-label", el.editObjectButton.title);

assets/webui/ofdgo_edit.js

@@ -1186,10 +1186,12 @@ export class CanvasEditor {
 		input.setAttribute("aria-label", "编辑文字");
 		input.setAttribute("role", "textbox");
 		input.setAttribute("aria-multiline", "true");
+		input.setAttribute("dir", "auto");
 		input.contentEditable = "true";
 		input.spellcheck = false;
 		for (const text of item.text.split("\n")) {
 			const paragraph = document.createElement("div");
+			paragraph.setAttribute("dir", "auto");
 			if (text) paragraph.textContent = text;
 			else paragraph.append(document.createElement("br"));
 			input.append(paragraph);
@@ -1206,6 +1208,7 @@ export class CanvasEditor {
 			minHeight: autoSize ? "0px" : `${frame.height * PX_PER_MM + 4}px`,
 			transform: `matrix(${a},${b},${c},${d},${(e + a * left) * PX_PER_MM},${(f + b * left) * PX_PER_MM})`,
 			whiteSpace: item.wrap ? "pre-wrap" : "pre",
+			unicodeBidi: "plaintext",
 			fontFamily: `"${face.family}"`, fontSize: `${item.size * PX_PER_MM}px`,
 			lineHeight: item.paragraphHeight || item.lineHeight ? `${(item.paragraphHeight || item.lineHeight) * PX_PER_MM}px` : "normal", color: item.color,
 			textAlign: item.align || "left",

internal/webui/wasm.go

@@ -184,6 +184,7 @@ func RunWASM() {
 	registerCallback("ofdgoReadAnnotation", readAnnotation)
 	registerCallback("ofdgoInsertInk", insertInk)
 	registerCallback("ofdgoStyleObjects", styleObjects)
+	registerCallback("ofdgoPreviewPositionedText", previewPositionedText)
 	registerCallback("ofdgoMoveOutline", moveOutline)
 	registerCallback("ofdgoCaptureStyle", captureStyle)
 	registerCallback("ofdgoGroupObjects", groupObjects)
@@ -1702,6 +1703,7 @@ func editorCapabilities(capability ofdgo.ObjectCapabilities, kind string) map[st
 	result := map[string]any{"update": capability.Update, "paint": capability.Paint, "replaceFont": capability.ReplaceFont, "reflow": capability.Reflow, "layoutKnown": capability.LayoutKnown, "transform": capability.Transform, "arrange": capability.Arrange, "copy": capability.Copy, "delete": capability.Delete, "order": capability.Order, "reason": capability.Reason, "reasonCode": string(capability.ReasonCode),
 		"replaceImage": capability.ReplaceImage, "cropImage": capability.CropImage, "fitImage": capability.FitImage, "resetCrop": capability.ResetCrop, "ungroup": capability.Ungroup, "stretch": capability.Stretch, "enter": capability.Transform && (kind == "CompositeObject" || kind == "CompositeGraphicUnit")}
 	result["textContent"] = capability.TextContent
+	result["rewriteText"] = capability.RewriteText
 	if missing := capability.MissingGlyphs; missing != nil {
 		result["missingGlyphs"] = map[string]any{"fontID": missing.FontID, "characters": missing.Characters}
 	}
@@ -1711,6 +1713,16 @@ func editorCapabilities(capability ofdgo.ObjectCapabilities, kind string) map[st
 // editorAppearance 提供对象自身透明度及有效绘制外观，不混入父对象透明度
 // 入参: item 前端对象, object 有效样式, paint 是否可改色, scale 描边页面倍率
 func editorAppearance(item map[string]any, object ofdgo.GraphicObject, paint bool, scale float64) {
+	links := 0
+	for _, action := range object.Actions() {
+		if action.Event == "CLICK" && (action.URI != nil || action.Goto != nil) {
+			links++
+			if data, err := json.Marshal(action); err == nil {
+				item["link"] = string(data)
+			}
+		}
+	}
+	item["linkCount"] = links
 	var alpha *int
 	var fill, stroke *ofdgo.FillColor
 	switch object.Type {
@@ -1945,7 +1957,7 @@ func changeCompositeObjects(args []js.Value) (any, error) {
 			if len(indexes) != 1 {
 				return fmt.Errorf("text layout requires one member")
 			}
-			layout := ofdgo.TextLayout{Wrap: args[6].Bool(), Align: args[7].String(), LineHeight: args[8].Float(), LetterSpacing: args[9].Float(), LeftIndent: args[10].Float(), RightIndent: args[11].Float(), FirstLineIndent: args[12].Float()}
+			layout := ofdgo.TextLayout{AutoBidi: true, Wrap: args[6].Bool(), Align: args[7].String(), LineHeight: args[8].Float(), LetterSpacing: args[9].Float(), LeftIndent: args[10].Float(), RightIndent: args[11].Float(), FirstLineIndent: args[12].Float()}
 			if !args[4].IsNull() {
 				return currentEditor.ResizeCompositeTextFrame(page, path, indexes[0], args[4].Float(), args[5].Float(), layout)
 			}
@@ -2224,6 +2236,40 @@ func previewText(args []js.Value) (any, error) {
 	return map[string]any{"runs": runs, "scale": scale, "weight": text.Weight, "italic": text.Italic}, nil
 }
 
+// previewPositionedText 预览保留定位的文字替换，不修改编辑器或撤销记录
+// 入参: args 页面、对象标识和内容
+// 返回: any SVG预览, error 错误信息
+func previewPositionedText(args []js.Value) (any, error) {
+	object, err := currentEditor.Object(args[0].Int(), args[1].String())
+	if err != nil {
+		return nil, err
+	}
+	if object.Type != "TextObject" {
+		return nil, fmt.Errorf("object is not text")
+	}
+	if err := currentEditor.RewriteText(&object.TextObject, args[2].String()); err != nil {
+		return nil, err
+	}
+	measured, err := currentSession.Renderer.MeasureObject(object, ofdgo.MeasureOptions{})
+	if err != nil {
+		return nil, err
+	}
+	box := measured.Bounds
+	margin := object.TextObject.Size / 4
+	box.X, box.Y, box.W, box.H = box.X-margin, box.Y-margin, box.W+2*margin, box.H+2*margin
+	boundary, err := ofdgo.ParseBox(object.TextObject.Boundary)
+	if err != nil {
+		return nil, err
+	}
+	object.TextObject.Boundary = fmt.Sprintf("%g %g %g %g", boundary.X-box.X, boundary.Y-box.Y, boundary.W, boundary.H)
+	page := &ofdgo.PageContent{Area: ofdgo.PageArea{PhysicalBox: fmt.Sprintf("0 0 %g %g", box.W, box.H)}, Content: ofdgo.Content{Layer: []ofdgo.Layer{{Objects: []ofdgo.GraphicObject{object}}}}}
+	var output bytes.Buffer
+	if err := currentSession.Renderer.RenderToSVG(page, &output); err != nil {
+		return nil, err
+	}
+	return output.String(), nil
+}
+
 // updateText 修改文字，null内容保留定位且允许替换字体，null字体数据和颜色沿用对象属性
 // 入参: args 页码、对象标识、内容、字体数据、字号和颜色
 // 返回: any 文档信息, error 错误信息
@@ -2258,7 +2304,10 @@ func updateText(args []js.Value) (any, error) {
 	}
 	if !args[2].IsNull() {
 		if args[4].Float() == object.TextObject.Size {
-			style := ofdgo.TextStyle{Font: object.TextObject.Font}
+			var style ofdgo.TextStyle
+			if !args[3].IsNull() {
+				style.Font = object.TextObject.Font
+			}
 			if !args[5].IsNull() {
 				var fill ofdgo.FillColor
 				if err := setEditorColor(&fill, args[5].String()); err != nil {
@@ -2407,7 +2456,7 @@ func insertText(args []js.Value) (any, error) {
 		Boundary: fmt.Sprintf("%g %g %g %g", box.X, box.Y, box.W, box.H),
 		Font:     fontID, Size: args[5].Float(),
 	}}
-	if err := currentEditor.LayoutText(&object.TextObject, args[1].String(), ofdgo.TextLayout{Wrap: args[8].Bool(), Align: args[9].String(), LineHeight: args[10].Float(), LetterSpacing: args[11].Float(), LeftIndent: args[12].Float(), RightIndent: args[13].Float(), FirstLineIndent: args[14].Float()}); err != nil {
+	if err := currentEditor.LayoutText(&object.TextObject, args[1].String(), ofdgo.TextLayout{AutoBidi: true, Wrap: args[8].Bool(), Align: args[9].String(), LineHeight: args[10].Float(), LetterSpacing: args[11].Float(), LeftIndent: args[12].Float(), RightIndent: args[13].Float(), FirstLineIndent: args[14].Float()}); err != nil {
 		return nil, err
 	}
 	if err := setTextColor(&object.TextObject, args[6].String()); err != nil {
@@ -2438,7 +2487,7 @@ func layoutText(args []js.Value) (any, error) {
 		}
 	}
 	value, _ := object.TextObject.TextLayout()
-	if err := currentEditor.LayoutText(&object.TextObject, value, ofdgo.TextLayout{Wrap: args[4].Bool(), Align: args[5].String(), LineHeight: args[6].Float(), LetterSpacing: args[7].Float(), LeftIndent: args[8].Float(), RightIndent: args[9].Float(), FirstLineIndent: args[10].Float()}); err != nil {
+	if err := currentEditor.LayoutText(&object.TextObject, value, ofdgo.TextLayout{AutoBidi: true, Wrap: args[4].Bool(), Align: args[5].String(), LineHeight: args[6].Float(), LetterSpacing: args[7].Float(), LeftIndent: args[8].Float(), RightIndent: args[9].Float(), FirstLineIndent: args[10].Float()}); err != nil {
 		return nil, err
 	}
 	revision := currentEditor.Revision()
@@ -2938,6 +2987,13 @@ func changeOutline(args []js.Value) (any, error) {
 // 返回: any 文档信息, error 错误信息
 func styleObjects(args []js.Value) (any, error) {
 	style := objectStyle(args[2])
+	linkField := args[2].Get("link")
+	var link *ofdgo.AnnotationLink
+	if !linkField.IsUndefined() && !linkField.IsNull() {
+		if err := json.Unmarshal([]byte(linkField.String()), &link); err != nil {
+			return nil, err
+		}
+	}
 	var border *ofdgo.ImageBorderStyle
 	if field := args[2].Get("borderStyle"); !field.IsUndefined() {
 		if err := json.Unmarshal([]byte(field.String()), &border); err != nil {
@@ -2967,6 +3023,11 @@ func styleObjects(args []js.Value) (any, error) {
 	return changeObjects(func() error {
 		return currentEditor.Transaction(func(editor *ofdgo.Editor) error {
 			page, ids := args[0].Int(), stringsFromJS(args[1])
+			if !linkField.IsUndefined() {
+				if err := editor.SetObjectLink(page, ids, link); err != nil {
+					return err
+				}
+			}
 			if border != nil {
 				if err := resolveStylePaint((*ofdgo.FillColor)(border.Color)); err != nil {
 					return err

ofdgo_backend.go

@@ -149,6 +149,17 @@ func backendName(backend Backend) string {
 func WithRenderBackends(backends RenderBackends) RendererOption {
 	return func(r *Renderer) {
 		fontsChanged := !sameBackend(r.backends.Fonts, backends.Fonts)
+		for _, pair := range [][2]Backend{
+			{r.backends.FontResources, backends.FontResources}, {r.backends.Fonts, backends.Fonts},
+			{r.backends.Geometry, backends.Geometry}, {r.backends.Compiler, backends.Compiler},
+			{r.backends.Raster, backends.Raster}, {r.backends.SVG, backends.SVG},
+			{r.backends.PDF, backends.PDF}, {r.backends.EPS, backends.EPS},
+		} {
+			if !sameBackend(pair[0], pair[1]) {
+				r.backendStates = make(map[any]any)
+				break
+			}
+		}
 		r.backends = backends
 		if fontsChanged {
 			r.resetFontBackendCache()
@@ -202,7 +213,12 @@ func (r *Renderer) Backends() RenderBackends {
 // 入参: backend 光栅后端，nil禁用图像输出
 // 返回: RendererOption 渲染选项
 func WithRasterBackend(backend RasterBackend) RendererOption {
-	return func(r *Renderer) { r.backends.Raster = backend }
+	return func(r *Renderer) {
+		if !sameBackend(r.backends.Raster, backend) {
+			r.backendStates = make(map[any]any)
+		}
+		r.backends.Raster = backend
+	}
 }
 
 // CompilePage 编译与后端无关的光栅页面，可交给任意RasterBackend绘制

ofdgo_crypto.go

@@ -28,7 +28,7 @@ var (
 	ErrEncryptionPolicyRequired = errors.New("explicit encryption policy required")
 )
 
-// Credentials 解密凭据，UserName为空时尝试匹配用户；证书采用DER编码
+// Credentials 解密凭据，UserName用于筛选接收者，留空自动匹配，不参与口令派生；证书采用DER编码
 // Password与Decrypter分别用于口令和证书方案，私钥可由外部密码设备持有
 type Credentials struct {
 	UserName    string
@@ -86,6 +86,7 @@ type EncryptionRecipient struct {
 }
 
 // EncryptionOptions 设置GM/T0099加密，口令与证书方案二选一
+// UserName标记口令接收者，不参与口令派生，留空使用User
 // 口令方案应使用足够长的随机口令；标准密钥派生不提供慢速口令哈希
 type EncryptionOptions struct {
 	Password   []byte

ofdgo_editor.go

@@ -79,7 +79,7 @@ func (e *Editor) SetFontFS(fsys ...fs.FS) {
 func (e *Editor) SetPageCompiler(compiler PageCompiler) {
 	e.backends.Compiler = compiler
 	if e.fontRenderer != nil {
-		e.fontRenderer.backends.Compiler = compiler
+		WithRenderBackends(e.backends)(e.fontRenderer)
 	}
 }
 

ofdgo_editor_batch.go

@@ -526,7 +526,7 @@ func (e *Editor) updateObjectOrigins(page int, objects []GraphicObject, preserve
 			beforeOrigins[ids[i]], afterOrigins[ids[i]] = origin, next
 		}
 	}
-	if reflect.DeepEqual(before, after) {
+	if reflect.DeepEqual(before, after) && len(afterOrigins) == 0 {
 		return nil
 	}
 	apply := func(e *Editor, objects []GraphicObject, origins map[string]*editorObjectOrigin) {

ofdgo_editor_import.go

@@ -56,6 +56,7 @@ type editorPageImport struct {
 	defaultCS     string
 	attachments   map[string][]byte
 	copyPage      bool
+	strictLinks   bool
 	progress      editorProgress
 }
 
@@ -69,6 +70,152 @@ type PageImportOptions struct {
 	OnProgress     func(stage string, completed, total int) error
 }
 
+// ObjectImportOptions 跨文档对象迁移选项，位移单位为毫米
+// AllowDecrypted显式允许将加密来源导入未加密目标，进度回调返回错误时撤销整个操作
+type ObjectImportOptions struct {
+	DX, DY         float64
+	AllowDecrypted bool
+	OnProgress     func(stage string, completed, total int) error
+}
+
+// ImportObjects 迁移选区及引用资源，不改变来源与目标页面结构，提交一次撤销记录
+// 保留对象原文与图层继承，同页链接映射到目标页，无法迁移的跨页链接明确报错
+// 返回后可关闭来源阅读器，后续修改来源不影响副本
+// 入参: source 来源编辑器, sourcePage 来源页, ids 对象标识, page 目标页, options 迁移选项
+// 返回: []string 新对象标识, error 错误信息
+func (e *Editor) ImportObjects(source *Editor, sourcePage int, ids []string, page int, options ObjectImportOptions) ([]string, error) {
+	if !finite(options.DX) || !finite(options.DY) {
+		return nil, fmt.Errorf("import requires finite offsets")
+	}
+	if source.encryption != nil && e.encryption == nil && !options.AllowDecrypted {
+		return nil, ErrEncryptionPolicyRequired
+	}
+	objects, err := source.Objects(sourcePage, ids)
+	if err != nil {
+		return nil, err
+	}
+	target, err := e.page(page)
+	if err != nil || len(objects) == 0 {
+		return nil, err
+	}
+	if source == e {
+		return e.CopyObjects(page, objects, options.DX, options.DY)
+	}
+	reader, err := source.Reader()
+	if err != nil {
+		return nil, err
+	}
+	doc, err := reader.Doc()
+	if err != nil {
+		return nil, err
+	}
+	ref := doc.Pages.Page[sourcePage]
+	progress := editorProgress(options.OnProgress)
+	base, migration, err := e.prepareImport(reader, doc, map[string]bool{ref.ID: true}, false, progress)
+	if err != nil {
+		return nil, err
+	}
+	migration.ids[ref.ID], migration.strictLinks = target.ID, true
+	pageName := reader.ResPath(ref.BaseLoc)
+	content, err := reader.PageContentByIndex(sourcePage)
+	if err != nil {
+		return nil, err
+	}
+	for _, value := range content.PageRes {
+		name, err := migration.resolve(pageName, "", value)
+		if err != nil {
+			return nil, err
+		}
+		if err := migration.resourceIndex(name); err != nil {
+			return nil, err
+		}
+	}
+	layers := make([][]byte, len(objects))
+	for i, object := range objects {
+		if err := progress.report("objects", i, len(objects)); err != nil {
+			return nil, err
+		}
+		var data []byte
+		var attrs ofdAttrs
+		if origin := object.origin; origin != nil {
+			data, err = editorXMLObject(origin.data, origin.node, origin.object, object)
+			if err == nil {
+				data, err = editorXMLStandalone(data, origin.node)
+			}
+			for parent := origin.node.parent; parent != nil; parent = parent.parent {
+				if parent.name.Local == "Layer" {
+					attrs.add("DrawParam", parent.attr("DrawParam"))
+					break
+				}
+			}
+		} else {
+			data, err = editorObjectXML(object)
+		}
+		if err != nil {
+			return nil, err
+		}
+		data, err = editorXMLContainer("Layer", attrs, data)
+		if err != nil {
+			return nil, err
+		}
+		root, err := parseEditorXML(data)
+		if err != nil {
+			return nil, err
+		}
+		layers[i], err = migration.encode(editorImportEntry{name: pageName, data: data}, root)
+		if err != nil {
+			return nil, err
+		}
+	}
+	if err := migration.encodeResources(); err != nil {
+		return nil, err
+	}
+	for _, resource := range e.resources {
+		delete(migration.files, resource.name)
+	}
+	next, err := migration.merge(base, nil, nil, nil)
+	if err != nil {
+		return nil, err
+	}
+	var copied []string
+	err = e.Transaction(func(editor *Editor) error {
+		if err := progress.report("commit", 0, 0); err != nil {
+			return err
+		}
+		editor.bindImportResources()
+		editor.source, editor.maxID = next, migration.maximum
+		next.idsReady = true
+		imported := make([]GraphicObject, len(layers))
+		for i, data := range layers {
+			data, err := editorXMLContainer("Content", nil, data)
+			if err != nil {
+				return err
+			}
+			var content Content
+			if err := xml.Unmarshal(data, &content); err != nil {
+				return err
+			}
+			layer := content.Layer[0]
+			root, err := parseEditorXML(data)
+			if err != nil {
+				return err
+			}
+			object := layer.Objects[0]
+			imported[i], err = editor.copiedObjectStyle(object, layer.DrawParam)
+			if err != nil {
+				return err
+			}
+			imported[i].TextObject.layout = objects[i].TextObject.layout
+			imported[i].state = objects[i].state
+			imported[i].CompositeGraphicUnit.states = remapCompositeStates(objects[i].CompositeGraphicUnit.states, migration.ids)
+			imported[i].origin = &editorObjectOrigin{editor: editor, data: data, node: root.child("Layer").children[0], object: object}
+		}
+		copied, err = editor.CopyObjects(page, imported, options.DX, options.DY)
+		return err
+	})
+	return copied, err
+}
+
 // ImportPages 将来源主文档中的指定页面插入目标位置，保持输入顺序并作为一次撤销操作
 // 页面索引从0开始，at可等于当前页数；复制关联模板、注释、签章外观和实际引用的资源
 // 不导入来源元数据和目录，指向未选页面的跳转被移除；签名数据仅保留原始凭据，不代表合并后文档有效
@@ -117,56 +264,10 @@ func (e *Editor) importPages(source *Reader, indexes []int, at int, copyPage boo
 		return nil, nil
 	}
 	progress := editorProgress(options.OnProgress)
-	maximum, err := e.sourceMaxID(progress)
+	base, m, err := e.prepareImport(source, doc, selected, copyPage, progress)
 	if err != nil {
 		return nil, err
 	}
-	base := e.source
-	if base == nil {
-		base, err = e.importBase()
-		if err != nil {
-			return nil, err
-		}
-	}
-	m := &editorPageImport{reader: source, doc: doc, directory: e.packageDirectory(), target: base.reader, maximum: maximum, copyPage: copyPage, progress: progress,
-		paths: make(map[string]string), evidence: make(map[string]string),
-		ids: make(map[string]string), pages: selected, files: make(map[string][]byte), resources: make(map[string]editorImportEntry), used: make(map[string][]byte), templates: make(map[string]TemplatePage), templateParts: make(map[string][]byte), attachments: make(map[string][]byte)}
-	for _, resource := range e.resources {
-		m.files[resource.name] = nil
-	}
-	m.documentXML, err = m.readFile(source.ResPath(source.OFD.DocBody[0].DocRoot))
-	if err != nil {
-		return nil, err
-	}
-	m.documentRoot, err = parseEditorXML(m.documentXML)
-	if err != nil {
-		return nil, err
-	}
-	if copyPage {
-		for _, page := range doc.Pages.Page {
-			if !selected[page.ID] {
-				m.ids[page.ID] = page.ID
-			}
-		}
-	}
-	for _, name := range append(slices.Clone(doc.CommonData.PublicRes), doc.CommonData.DocumentRes...) {
-		if err := m.resourceIndex(source.ResPath(name)); err != nil {
-			return nil, err
-		}
-	}
-	for _, template := range doc.CommonData.TemplatePage {
-		m.templates[template.ID] = template
-	}
-	if doc.CommonData.DefaultCS != 0 {
-		m.defaultCS, err = m.reference(strconv.Itoa(doc.CommonData.DefaultCS))
-		if err != nil {
-			return nil, err
-		}
-	} else if !e.sourceRGB() {
-		m.defaultCS = m.id("defaultRGB")
-		m.used["defaultRGB"] = []byte(`<ofd:ColorSpace ID="` + m.defaultCS + `" Type="RGB" BitsPerComponent="8"/>`)
-		m.resources["defaultRGB"] = editorImportEntry{group: "ColorSpaces"}
-	}
 	refs := make([]Page, len(indexes))
 	ids := make([]string, len(indexes))
 	for i, index := range indexes {
@@ -209,30 +310,9 @@ func (e *Editor) importPages(source *Reader, indexes []int, at int, copyPage boo
 		}
 	}
 	if !copyPage {
-		var resourceContent []byte
-		for _, group := range []string{"ColorSpaces", "DrawParams", "Fonts", "MultiMedias", "CompositeGraphicUnits"} {
-			var entries []byte
-			for _, id := range slices.Sorted(maps.Keys(m.used)) {
-				if m.resources[id].group == group {
-					entries = append(entries, m.used[id]...)
-				}
-			}
-			if len(entries) == 0 {
-				continue
-			}
-			encoded, err := editorXMLContainer(group, nil, entries)
-			if err != nil {
+		if err := m.encodeResources(); err != nil {
 			return nil, err
 		}
-			resourceContent = append(resourceContent, encoded...)
-		}
-		resources, err := editorXMLContainer("Res", nil, resourceContent)
-		if err != nil {
-			return nil, err
-		}
-		if len(resourceContent) != 0 {
-			m.resourceXML = resources
-		}
 	}
 	for _, resource := range e.resources {
 		delete(m.files, resource.name)
@@ -281,19 +361,7 @@ func (e *Editor) importPages(source *Reader, indexes []int, at int, copyPage boo
 	if err := progress.report("commit", 0, 0); err != nil {
 		return nil, err
 	}
-	if e.source == nil {
-		for i := range e.resources {
-			resource := &e.resources[i]
-			if resource.font != nil {
-				resource.font = cloneEditorData(resource.font)
-				resource.font.FontFile = "/" + resource.name
-			}
-			if resource.image != nil {
-				resource.image = cloneEditorData(resource.image)
-				resource.image.MediaFile = "/" + resource.name
-			}
-		}
-	}
+	e.bindImportResources()
 	e.source, e.maxID = next, m.maximum
 	next.idsReady = true
 	e.outlines = outlines
@@ -320,6 +388,111 @@ func (e *Editor) importPages(source *Reader, indexes []int, at int, copyPage boo
 	return ids, nil
 }
 
+// bindImportResources 将新建文档资源路径绑定到包根，保持迁移前后的解析一致
+func (e *Editor) bindImportResources() {
+	if e.source != nil {
+		return
+	}
+	for i := range e.resources {
+		resource := &e.resources[i]
+		if resource.font != nil {
+			resource.font = cloneEditorData(resource.font)
+			resource.font.FontFile = "/" + resource.name
+		}
+		if resource.image != nil {
+			resource.image = cloneEditorData(resource.image)
+			resource.image.MediaFile = "/" + resource.name
+		}
+	}
+}
+
+// prepareImport 建立页面和对象迁移共用的资源图，不修改目标编辑器
+// 入参: source 来源, doc 来源文档, selected 页面映射范围, copyPage 是否同文档, progress 进度
+// 返回: *editorSource 目标基础, *editorPageImport 资源图, error 错误信息
+func (e *Editor) prepareImport(source *Reader, doc *Document, selected map[string]bool, copyPage bool, progress editorProgress) (*editorSource, *editorPageImport, error) {
+	maximum, err := e.sourceMaxID(progress)
+	if err != nil {
+		return nil, nil, err
+	}
+	base := e.source
+	if base == nil {
+		base, err = e.importBase()
+		if err != nil {
+			return nil, nil, err
+		}
+	}
+	m := &editorPageImport{reader: source, doc: doc, directory: e.packageDirectory(), target: base.reader, maximum: maximum, copyPage: copyPage, progress: progress,
+		paths: make(map[string]string), evidence: make(map[string]string), ids: make(map[string]string), pages: selected,
+		files: make(map[string][]byte), resources: make(map[string]editorImportEntry), used: make(map[string][]byte),
+		templates: make(map[string]TemplatePage), templateParts: make(map[string][]byte), attachments: make(map[string][]byte)}
+	for _, resource := range e.resources {
+		m.files[resource.name] = nil
+	}
+	m.documentXML, err = m.readFile(source.ResPath(source.OFD.DocBody[0].DocRoot))
+	if err != nil {
+		return nil, nil, err
+	}
+	m.documentRoot, err = parseEditorXML(m.documentXML)
+	if err != nil {
+		return nil, nil, err
+	}
+	if copyPage {
+		for _, page := range doc.Pages.Page {
+			if !selected[page.ID] {
+				m.ids[page.ID] = page.ID
+			}
+		}
+	}
+	for _, name := range append(slices.Clone(doc.CommonData.PublicRes), doc.CommonData.DocumentRes...) {
+		if err := m.resourceIndex(source.ResPath(name)); err != nil {
+			return nil, nil, err
+		}
+	}
+	for _, template := range doc.CommonData.TemplatePage {
+		m.templates[template.ID] = template
+	}
+	if doc.CommonData.DefaultCS != 0 {
+		m.defaultCS, err = m.reference(strconv.Itoa(doc.CommonData.DefaultCS))
+		if err != nil {
+			return nil, nil, err
+		}
+	} else if !e.sourceRGB() {
+		m.defaultCS = m.id("defaultRGB")
+		m.used["defaultRGB"] = []byte(`<ofd:ColorSpace ID="` + m.defaultCS + `" Type="RGB" BitsPerComponent="8"/>`)
+		m.resources["defaultRGB"] = editorImportEntry{group: "ColorSpaces"}
+	}
+	return base, m, nil
+}
+
+// encodeResources 编码本次迁移实际引用的资源，不包含未使用的资源定义
+// 返回: error 编码错误
+func (m *editorPageImport) encodeResources() error {
+	var content []byte
+	ids := slices.Sorted(maps.Keys(m.used))
+	for _, group := range []string{"ColorSpaces", "DrawParams", "Fonts", "MultiMedias", "CompositeGraphicUnits"} {
+		var entries []byte
+		for _, id := range ids {
+			if m.resources[id].group == group {
+				entries = append(entries, m.used[id]...)
+			}
+		}
+		if len(entries) == 0 {
+			continue
+		}
+		encoded, err := editorXMLContainer(group, nil, entries)
+		if err != nil {
+			return err
+		}
+		content = append(content, encoded...)
+	}
+	if len(content) == 0 {
+		return nil
+	}
+	var err error
+	m.resourceXML, err = editorXMLContainer("Res", nil, content)
+	return err
+}
+
 // readFile 分块读取导入条目，允许资源解压过程中取消，不共享来源内存
 // 入参: name 包内路径
 // 返回: []byte 条目内容, error 错误信息
@@ -738,6 +911,9 @@ func (m *editorPageImport) encode(entry editorImportEntry, node *editorXML) ([]b
 				bookmarks[bookmark.Name] = bookmark.Dest
 			}
 			if dest := gotoDest(&action, bookmarks); !m.copyPage && (dest == nil || !m.pages[dest.PageID]) {
+				if m.strictLinks {
+					return nil, fmt.Errorf("object link targets a page outside the imported selection")
+				}
 				return nil, nil
 			}
 		}
@@ -1073,20 +1249,24 @@ func (m *editorPageImport) merge(base *editorSource, refs []Page, annotations, s
 	for _, id := range slices.Sorted(maps.Keys(m.templateParts)) {
 		content = append(content, m.templateParts[id]...)
 	}
-	data = editorPatchXML(data, []editorXMLPatch{{position, position, content}})
-	root, err = parseEditorXML(data)
-	if err != nil {
-		return nil, err
+	patches := []editorXMLPatch{{position, position, content}}
+	patch := editorXMLPatch{common.open, common.open, editorXMLText("MaxUnitID", strconv.Itoa(m.maximum))}
+	if maximum := common.child("MaxUnitID"); maximum != nil {
+		patch = editorXMLContent(data, maximum, []byte(strconv.Itoa(m.maximum)))
 	}
+	patches = append(patches, patch)
 	pages := root.child("Pages")
 	if pages == nil {
 		return nil, fmt.Errorf("document has no Pages")
 	}
-	content = bytes.Clone(m.pageParts)
-	if pages.open != pages.end {
-		content = append(bytes.Clone(data[pages.open:pages.close]), content...)
+	if len(m.pageParts) != 0 {
+		if pages.open == pages.end {
+			patches = append(patches, editorXMLContent(data, pages, m.pageParts))
+		} else {
+			patches = append(patches, editorXMLPatch{pages.close, pages.close, m.pageParts})
 		}
-	data = editorPatchXML(data, []editorXMLPatch{editorXMLContent(data, pages, content)})
+	}
+	data = editorPatchXML(data, patches)
 	if len(annotations) != 0 {
 		loc, err := mergeImportIndex(base.reader, files, base.document.Annotations, path.Join(m.directory, "Annotations.xml"), "Annotations", annotations)
 		if err != nil {
@@ -1117,16 +1297,6 @@ func (m *editorPageImport) merge(base *editorSource, refs []Page, annotations, s
 			}
 		}
 	}
-	root, err = parseEditorXML(data)
-	if err != nil {
-		return nil, err
-	}
-	common = root.child("CommonData")
-	patch := editorXMLPatch{common.open, common.open, editorXMLText("MaxUnitID", strconv.Itoa(m.maximum))}
-	if maximum := common.child("MaxUnitID"); maximum != nil {
-		patch = editorXMLContent(data, maximum, []byte(strconv.Itoa(m.maximum)))
-	}
-	data = editorPatchXML(data, []editorXMLPatch{patch})
 	files[name] = data
 	if len(signatures) != 0 {
 		loc, err := mergeImportIndex(base.reader, files, base.document.Signatures, path.Join(m.directory, "Signs", "Signatures.xml"), "Signatures", signatures)

ofdgo_editor_open.go

@@ -71,10 +71,12 @@ type editorSourcePage struct {
 // Paint表示可独立修改纯色填充和描边，不要求重新排版文字
 // ReplaceImage表示可替换图片数据，CropImage表示可裁剪图片；内部裁剪与原裁剪取交集
 // MissingGlyphs提供缺字导致操作受限时的结构化诊断
+// RewriteText表示可保留原定位修改，具体替换仍需校验长度、字形映射和字体覆盖
 // Ungroup表示可移除组合容器并保留内部内容，Stretch表示图片及纯图片组合可独立调整宽高
 type ObjectCapabilities struct {
 	Update        bool
 	TextContent   bool
+	RewriteText   bool
 	Paint         bool
 	ReplaceFont   bool
 	ReplaceImage  bool
@@ -504,6 +506,7 @@ func (e *Editor) objectCapabilities(object GraphicObject, orderable map[*editorX
 	origin := e.objectOrigin(id)
 	if origin == nil {
 		all.TextContent = all.Reflow
+		all.RewriteText = object.Type == "TextObject"
 		all.Stretch = object.Type == "ImageObject"
 		all.ReplaceImage = object.Type == "ImageObject"
 		all.CropImage = all.ReplaceImage
@@ -551,7 +554,12 @@ func (e *Editor) objectCapabilities(object GraphicObject, orderable map[*editorX
 		all.Reason, all.ReasonCode = "image actions cannot be transformed together with the border", EditUnsupportedObject
 	}
 	if object.Type == "TextObject" {
-		all.TextContent = all.Update && object.TextObject.ReadDirection == 0 && object.TextObject.CharDirection == 0
+		all.TextContent = all.Update && object.TextObject.ReadDirection == 0 && object.TextObject.CharDirection == 0 && (all.LayoutKnown || len(object.TextObject.CGTransform) == 0)
+		all.RewriteText = all.TextContent
+		if !all.RewriteText {
+			text := object.TextObject
+			all.RewriteText = e.RewriteText(&text, text.Text()) == nil
+		}
 		all.Arrange = all.Update || e.editorTextMeasurable(object.TextObject)
 		if _, err := object.TextObject.TextFrame(); err != nil {
 			all.Reflow = false

ofdgo_editor_package.go

@@ -236,7 +236,22 @@ func (e *Editor) sourceParts(progress editorProgress) (map[string][]byte, error)
 // 返回: []byte 页面XML, error 错误信息
 func (e *Editor) sourcePageXML(index int, source *editorSourcePage) ([]byte, error) {
 	page := e.pages[index]
-	if reflect.DeepEqual(page, *source.original) {
+	unchanged := reflect.DeepEqual(page, *source.original)
+	if unchanged && len(e.origins) != 0 {
+		for _, layer := range page.Content.Layer {
+			for _, object := range layer.Objects {
+				id := editorObjectID(object)
+				if origin := e.origins[id]; origin != nil && origin.node != source.nodes[id] {
+					unchanged = false
+					break
+				}
+			}
+			if !unchanged {
+				break
+			}
+		}
+	}
+	if unchanged {
 		return source.data, nil
 	}
 	if source.root.open == source.root.end {
@@ -314,11 +329,11 @@ func (e *Editor) sourcePageXML(index int, source *editorSourcePage) ([]byte, err
 			if exists {
 				nextID := editorObjectID(next)
 				origin := source.nodes[nextID]
-				if origin != nil && reflect.DeepEqual(before[nextID], next) {
+				current := e.objectOrigin(nextID)
+				if origin != nil && current.node == origin && reflect.DeepEqual(before[nextID], next) {
 					encoded = data[origin.start:origin.end]
 				} else {
 					var err error
-					current := e.objectOrigin(nextID)
 					encoded, err = editorXMLObject(current.data, current.node, current.object, next)
 					if err != nil {
 						return nil, err

ofdgo_editor_style.go

@@ -15,6 +15,7 @@
 package ofdgo
 
 import (
+	"encoding/xml"
 	"fmt"
 	"image/color"
 	"math"
@@ -45,6 +46,136 @@ type ImageBorderStyle struct {
 	Color            *StrokeColor
 }
 
+// DrawParam 读取绘制参数，resolved为true时合并继承链，返回独立副本
+// 入参: id 资源标识, resolved 是否解析继承
+// 返回: *DrawParam 绘制参数, error 错误信息
+func (e *Editor) DrawParam(id string, resolved bool) (*DrawParam, error) {
+	if resolved {
+		return e.editorDrawParam(id, make(map[string]bool))
+	}
+	for _, resource := range e.resources {
+		if resource.draw != nil && resource.draw.ID == id {
+			return cloneEditorData(resource.draw), nil
+		}
+	}
+	if e.source != nil {
+		if value := e.source.reader.drawParamCache[id]; value != nil {
+			return cloneEditorData(value), nil
+		}
+	}
+	return nil, &EditError{Code: EditUnsupportedStyle, Err: fmt.Errorf("draw parameter %q not found", id)}
+}
+
+// SetObjectDrawParam 修改对象的绘制参数引用，保留局部覆盖和原文扩展，空标识恢复图层继承
+// 入参: page 页面索引, ids 对象标识, id 绘制参数标识
+// 返回: error 错误信息
+func (e *Editor) SetObjectDrawParam(page int, ids []string, id string) error {
+	if _, err := e.editorDrawParam(id, make(map[string]bool)); err != nil {
+		return err
+	}
+	objects, indexes, err := e.selectedObjects(page, ids)
+	if err != nil {
+		return err
+	}
+	origins := make(map[string]*editorObjectOrigin)
+	for i, object := range objects {
+		if object.Type != "TextObject" && object.Type != "PathObject" && object.Type != "CompositeObject" && object.Type != "CompositeGraphicUnit" {
+			return fmt.Errorf("object %q does not support draw parameters", ids[i])
+		}
+		origin := e.objectOrigin(ids[i])
+		if origin != nil && origin.node.attr("DrawParam") == id {
+			continue
+		}
+		var data []byte
+		if origin != nil {
+			before, resolveErr := e.resolveEditorStyle(origin.object, e.pages[page].Content.Layer[indexes[i].layer].DrawParam)
+			if resolveErr != nil {
+				return resolveErr
+			}
+			oldXML, encodeErr := editorObjectXML(before)
+			if encodeErr != nil {
+				return encodeErr
+			}
+			comparison := object
+			comparison.TextObject.DrawParam, comparison.PathObject.DrawParam = "", ""
+			newXML, encodeErr := editorObjectXML(comparison)
+			if encodeErr != nil {
+				return encodeErr
+			}
+			data, err = editorXMLMerge(origin.data, origin.node, oldXML, newXML)
+			if err == nil {
+				data, err = editorXMLStandalone(data, origin.node)
+			}
+		} else {
+			data, err = editorObjectXML(object)
+		}
+		if err != nil {
+			return err
+		}
+		root, err := parseEditorXML(data)
+		if err != nil {
+			return err
+		}
+		if id == "" {
+			before, encodeErr := editorXMLContainer(root.name.Local, ofdAttrs{{Name: xml.Name{Local: "DrawParam"}, Value: root.attr("DrawParam")}}, nil)
+			if encodeErr != nil {
+				return encodeErr
+			}
+			after, encodeErr := editorXMLContainer(root.name.Local, nil, nil)
+			if encodeErr != nil {
+				return encodeErr
+			}
+			data, err = editorXMLMerge(data, root, before, after)
+		} else {
+			data, err = editorXMLAttribute(data, root, "DrawParam", id)
+		}
+		if err != nil {
+			return err
+		}
+		next := GraphicObject{Type: object.Type, state: object.state}
+		var target any
+		switch object.Type {
+		case "TextObject":
+			target = &next.TextObject
+		case "PathObject":
+			target = &next.PathObject
+		default:
+			target = &next.CompositeGraphicUnit
+		}
+		if err := xml.Unmarshal(data, target); err != nil {
+			return err
+		}
+		next, err = e.resolveEditorStyle(next, e.pages[page].Content.Layer[indexes[i].layer].DrawParam)
+		if err != nil {
+			return err
+		}
+		if next.TextObject.Font == object.TextObject.Font && next.TextObject.Size == object.TextObject.Size {
+			next.TextObject.layout = object.TextObject.layout
+		}
+		switch next.Type {
+		case "TextObject":
+			next.TextObject.DrawParam = id
+		case "PathObject":
+			next.PathObject.DrawParam = id
+		}
+		next.CompositeGraphicUnit.states = object.CompositeGraphicUnit.states
+		root, err = parseEditorXML(data)
+		if err != nil {
+			return err
+		}
+		updated := &editorObjectOrigin{editor: e, data: data, node: root, object: next}
+		if origin != nil {
+			updated.page, root.parent = origin.page, origin.node.parent
+		} else {
+			content := &editorXML{name: xml.Name{Local: "Content"}}
+			root.parent = &editorXML{name: xml.Name{Local: "Layer"}, parent: content, children: []*editorXML{root}}
+			content.children = []*editorXML{root.parent}
+		}
+		objects[i], origins[ids[i]] = next, updated
+	}
+	return e.updateObjectOrigins(page, objects, true, origins)
+}
+
 // AddDrawParam 注册绘制参数，保留继承引用，未引用的资源不写入文档
 // 入参: draw 绘制参数，ID由编辑器分配
 // 返回: string 资源标识, error 错误信息

ofdgo_editor_text.go

@@ -66,8 +66,9 @@ func missingGlyphError(id string, characters []rune) error {
 // Wrap按CTM变换前的边界宽度折行，Align为left、center、right或justify
 // LineHeight为毫米单位的基线间距，0使用字体度量；LetterSpacing为字素间的附加毫米间距，可为负
 // LeftIndent和RightIndent为左右缩进，FirstLineIndent为每段首行相对左缩进的偏移，单位为毫米
-// 零值保持显式换行和左对齐
+// AutoBidi自动识别双向文字并启用塑形，零值保持显式换行和左对齐
 type TextLayout struct {
+	AutoBidi        bool
 	Shape           bool
 	Shaping         TextShapeOptions
 	Wrap            bool
@@ -256,7 +257,7 @@ func (e *Editor) RewriteText(obj *TextObject, value string) error {
 	}
 	check = *obj
 	check.TextCode = codes
-	position := 0
+	position, mapping := 0, 0
 	for i, code := range codes {
 		before, after := textCodeRunes(obj.TextCode[i].Value), textCodeRunes(code.Value)
 		if len(before) == len(after) {
@@ -264,11 +265,11 @@ func (e *Editor) RewriteText(obj *TextObject, value string) error {
 				if before[j] == char {
 					continue
 				}
-				for k := range transforms {
-					transform := &transforms[k]
-					if position+j < transform.CodePosition || position+j >= transform.CodePosition+transform.CodeCount {
-						continue
+				for mapping < len(transforms) && position+j >= transforms[mapping].CodePosition+transforms[mapping].CodeCount {
+					mapping++
 				}
+				if mapping < len(transforms) && position+j >= transforms[mapping].CodePosition {
+					transform := &transforms[mapping]
 					if transform.CodeCount != 1 || transform.GlyphCount != 1 {
 						return &EditError{Code: EditLayoutRequired, Err: fmt.Errorf("changing a combined glyph requires explicit layout")}
 					}

ofdgo_object.go

@@ -19,6 +19,22 @@ import (
 	"strconv"
 )
 
+// Actions 返回对象动作的独立副本，不修改原对象
+// 返回: []Action 动作列表
+func (o GraphicObject) Actions() []Action {
+	switch o.Type {
+	case "TextObject":
+		return cloneEditorData(o.TextObject.Actions)
+	case "PathObject", "Path":
+		return cloneEditorData(o.PathObject.Actions)
+	case "ImageObject":
+		return cloneEditorData(o.ImageObject.Actions)
+	case "CompositeObject", "CompositeGraphicUnit":
+		return cloneEditorData(o.CompositeGraphicUnit.Actions)
+	}
+	return nil
+}
+
 // UnmarshalXML 解析路径并区分省略的虚线样式与显式实线
 // 入参: d XML解码器, start 起始节点
 // 返回: error 错误信息

ofdgo_renderer.go

@@ -53,6 +53,14 @@ type Renderer struct {
 // RendererOption 渲染器配置选项
 type RendererOption func(*Renderer)
 
+// ClearCache 释放派生字体、图片、模板与后端缓存，不改变文档和渲染配置
+func (r *Renderer) ClearCache() {
+	r.backendStates = make(map[any]any)
+	r.imageCache = make(map[string]image.Image)
+	r.templatePageCache = make(map[string]*PageContent)
+	r.resetFontCache()
+}
+
 // SetFontFS 替换外部字体文件系统并重置字体缓存
 // 入参: fsys 字体文件系统
 func (r *Renderer) SetFontFS(fsys ...fs.FS) {

ofdgo_text_layout.go

@@ -20,6 +20,8 @@ import (
 	"slices"
 	"strings"
 	"unicode/utf8"
+
+	"golang.org/x/text/unicode/bidi"
 )
 
 // LayoutText 按自有字体度量重排横向文字，保留绘制属性，可显式启用字体塑形
@@ -76,6 +78,18 @@ func LayoutText(obj *TextObject, value string, options TextLayout, metrics FontM
 	if lineHeight == 0 {
 		lineHeight = math.Max(obj.Size, float64(int(ascender)+int(descender)+int(gap))*unit)
 	}
+	if options.AutoBidi && !options.Shaping.Bidi {
+		for _, char := range value {
+			properties, _ := bidi.LookupRune(char)
+			switch properties.Class() {
+			case bidi.R, bidi.AL, bidi.RLE, bidi.RLO, bidi.RLI, bidi.FSI:
+				options.Shaping.Bidi = true
+			}
+			if options.Shaping.Bidi {
+				break
+			}
+		}
+	}
 	if options.Shape || options.Shaping != (TextShapeOptions{}) {
 		return layoutShapedText(obj, value, options, metrics, width, lineHeight, hScale, float64(ascender)*unit)
 	}

ofdgo_text_shape.go

@@ -293,21 +293,19 @@ func validateTextGlyphs(obj TextObject, glyphCount uint16) error {
 		total += len(textCodeRunes(code.Value))
 		ends = append(ends, total)
 	}
-	previous := 0
+	previous, boundary := 0, 0
 	for _, transform := range obj.CGTransform {
 		start, count := transform.CodePosition, transform.CodeCount
 		if start < previous || count <= 0 || start >= total || count > total-start {
 			return fmt.Errorf("invalid glyph character range")
 		}
 		end := start + count
-		for _, boundary := range ends {
-			if start < boundary {
-				if end > boundary {
+		for ends[boundary] <= start {
+			boundary++
+		}
+		if end > ends[boundary] {
 			return fmt.Errorf("glyph mapping crosses text codes")
 		}
-				break
-			}
-		}
 		ids := strings.Fields(transform.Glyphs)
 		if len(ids) == 0 || len(ids) != transform.GlyphCount {
 			return fmt.Errorf("invalid glyph count")