feat(编辑能力): 完善复合对象编辑，修复撤销后的粘贴路径和裁剪状态

assets/webui/ofdgo.js

@@ -37,6 +37,7 @@ const state = {
 	selectObjects: true,
 	dirty: false,
 	editorInfo: null,
+	editorViews: new Map(),
 	savedRevision: null,
 	insertObject: null,
 	importPageCount: 0,
@@ -1196,6 +1197,20 @@ function setEditorInfo(doc) {
 	setDirty(doc.revision !== state.savedRevision);
 }
 
+function editorLocation() {
+	const pending = canvasEditor.pendingSelection;
+	const index = pending?.index ?? canvasEditor.selected?.index ?? state.pageIndex;
+	return { page: state.doc.pages[index].id, scope: state.composite?.key || "", ids: pending?.ids || canvasEditor.items().map(item => item.id) };
+}
+
+function rememberEditorView(before, revision, reindex = false) {
+	for (const key of state.editorViews.keys()) {
+		if (key > revision) state.editorViews.delete(key);
+	}
+	state.editorViews.set(state.editorInfo.revision, { before, after: editorLocation(), reindex });
+	if (state.editorViews.size > 100) state.editorViews.delete(state.editorViews.keys().next().value);
+}
+
 function pageCan(capability, index = state.pageIndex) {
 	if (state.composite && capability === "insert") return false;
 	const bit = { insert: 1, copy: 2, delete: 4, move: 8, resize: 16 }[capability];
@@ -1228,6 +1243,7 @@ async function toggleEditor() {
 		const doc = await callWASM("ofdgoEditDocument");
 		if (openSeq !== state.openSeq) return;
 		state.savedRevision = doc.revision;
+		state.editorViews.clear();
 		setEditorInfo(doc);
 		state.editing = true;
 		state.composite = null;
@@ -1283,6 +1299,7 @@ async function createDocument(event) {
 		state.editing = true;
 		state.composite = null;
 		state.objectClipboard = null;
+		state.editorViews.clear();
 		state.styleClipboard = null;
 		state.fontRenderPending = false;
 		canvasEditor.clear();
@@ -1387,6 +1404,10 @@ async function exitCompositeScope() {
 }
 
 async function startImageCrop(item) {
+	if (item.scoped) {
+		canvasEditor.startCrop(item, { svg: item.surface.querySelector(".ofd-svg").cloneNode(true), urls: [] });
+		return;
+	}
 	const openSeq = state.openSeq;
 	const urls = [];
 	let mounted = false;
@@ -1603,6 +1624,7 @@ async function insertObject(event) {
 	}
 	let openSeq = state.openSeq;
 	const item = state.insertObject;
+	const before = editorLocation(), revision = state.editorInfo.revision;
 	const index = item?.index ?? state.pageIndex;
 	const page = state.doc.pages[index];
 	const x = Math.min(20, page.width / 10);
@@ -1633,6 +1655,7 @@ async function insertObject(event) {
 		openSeq = ++state.openSeq;
 		await refreshEditorPage(doc, index, openSeq);
 		if (openSeq === state.openSeq) {
+			rememberEditorView(before, revision);
 			el.viewerPanel.focus({ preventScroll: true });
 		}
 	} catch (err) {
@@ -1705,7 +1728,7 @@ async function changeTextStyle(color) {
 		updateObjectControls(canvasEditor.selected, true);
 		return;
 	}
-	if (state.composite) {
+	if (state.composite && color) {
 		if (color && fill !== null && canEditObject(item, "paint")) {
 			await changeDocument("ofdgoCompositeTextColor", item, fill);
 		}
@@ -1821,6 +1844,8 @@ async function changeDocument(name, item, ...args) {
 	const active = document.activeElement;
 	const toolbarFocus = el.editorTools.contains(active) ? active : null;
 	const previous = currentPageInfo();
+	const before = editorLocation(), revision = state.editorInfo.revision;
+	const restoring = name === "ofdgoUndo" || name === "ofdgoRedo";
 	const { scrollLeft, scrollTop } = el.viewerPanel;
 	const importing = name === "ofdgoImportPages";
 	if (importing) state.importing = true;
@@ -1833,10 +1858,10 @@ async function changeDocument(name, item, ...args) {
 		const scope = state.composite;
 		const operation = { ofdgoTransformObject: "transform", ofdgoTransformObjects: "transform", ofdgoRotateObjects: "rotate", ofdgoFlipObjects: "flip", ofdgoResizeObjects: "resize",
 			ofdgoAlignObject: "align", ofdgoAlignObjects: "align", ofdgoDistributeObjects: "distribute", ofdgoStyleObjects: "style", ofdgoUpdatePathStyle: "paint", ofdgoCompositeTextColor: "textColor",
+			ofdgoUpdateText: "text", ofdgoStyleText: "textStyle", ofdgoCropImage: "crop",
 			ofdgoDeleteObject: "delete", ofdgoDeleteObjects: "delete", ofdgoCopyObjects: "copy", ofdgoOrderObjects: "order" }[name];
 		const members = item?.items || (item ? [item] : []);
 		const scoped = scope && members.length && members.every(member => member.scoped);
-		if (!item) resetCompositeScope();
 		if (scoped && !operation) throw new Error("内部对象暂不支持此操作");
 		const doc = scoped
 			? await callWASM("ofdgoChangeCompositeObjects", item.index, scope.key, Array.isArray(item.id) ? item.id : members.map(member => member.id), operation, ...args)
@@ -1847,7 +1872,20 @@ async function changeDocument(name, item, ...args) {
 		if (doc.revision === state.editorInfo?.revision) {
 			return true;
 		}
-		if ((name === "ofdgoUndo" || name === "ofdgoRedo") && JSON.stringify(doc.outlines) !== JSON.stringify(state.doc.outlines)) {
+		const view = name === "ofdgoUndo" ? state.editorViews.get(revision) : name === "ofdgoRedo" ? state.editorViews.get(doc.revision) : null;
+		const reindex = !!scope && (scoped && ["ofdgoDeleteObject", "ofdgoDeleteObjects", "ofdgoCopyObjects", "ofdgoOrderObjects"].includes(name)
+			|| name === "ofdgoPasteObjects" && !!args[4]);
+		const reindexed = restoring ? view?.reindex && view.before : reindex && before;
+		const clipboard = state.objectClipboard;
+		if (reindexed && clipboard?.scope?.startsWith(reindexed.scope + "/") && clipboard.page === reindexed.page) state.objectClipboard = null;
+		const location = name === "ofdgoUndo" ? view?.before : view?.after;
+		const restoredIndex = location ? doc.pages.findIndex(page => page.id === location.page) : -1;
+		if (restoredIndex >= 0) {
+			state.composite = location.scope ? { index: restoredIndex, key: location.scope, objects: [] } : null;
+		} else if (!item && !(name === "ofdgoPasteObjects" && args[4])) {
+			resetCompositeScope();
+		}
+		if (restoring && JSON.stringify(doc.outlines) !== JSON.stringify(state.doc.outlines)) {
 			state.outlineSelection = null;
 			state.outlineExpanded.clear();
 		}
@@ -1856,6 +1894,7 @@ async function changeDocument(name, item, ...args) {
 			Object.assign(state.doc, { title: doc.title, author: doc.author, subject: doc.subject });
 			renderMeta();
 			updateControls();
+			rememberEditorView(before, revision);
 			return true;
 		}
 		if (name === "ofdgoChangeOutline" || name === "ofdgoMoveOutline") {
@@ -1865,6 +1904,7 @@ async function changeDocument(name, item, ...args) {
 			renderOutlines(false);
 			showNavigation(el.outlinesTab);
 			updateControls();
+			rememberEditorView(before, revision);
 			return true;
 		}
 		const clearSelection = !item || ["ofdgoDeleteObject", "ofdgoDeleteObjects", "ofdgoEraseObjects", "ofdgoEraseObjectsPath"].includes(name);
@@ -1880,14 +1920,16 @@ async function changeDocument(name, item, ...args) {
 			await refreshEditorPage(doc, item ? item.index : args[0], openSeq, clearSelection);
 		} else {
 			const samePage = doc.pages.findIndex((page) => page.id === previous.id);
-			const pageIndex = doc.pageIndex ?? (samePage < 0 ? Math.min(state.pageIndex, doc.pageCount - 1) : samePage);
+			const pageIndex = restoredIndex >= 0 ? restoredIndex : doc.pageIndex ?? (samePage < 0 ? Math.min(state.pageIndex, doc.pageCount - 1) : samePage);
 			const page = doc.pages[pageIndex];
 			const keepScroll = doc.pageIndex === undefined && page.id === previous.id && pageIndex === state.pageIndex
 				&& page.width === previous.width && page.height === previous.height;
 			await openDocument({ doc, openSeq, skipAutoFonts: true, pageIndex, fitMode: state.fitMode, scale: state.scale,
-				keepPreview: true, clearSelection, previewScroll: keepScroll ? { scrollLeft, scrollTop } : null });
+				keepPreview: true, clearSelection, selection: restoredIndex >= 0 ? { index: restoredIndex, ids: location.ids } : null,
+				previewScroll: keepScroll ? { scrollLeft, scrollTop } : null });
 		}
 		if (openSeq === state.openSeq) {
+			if (!restoring) rememberEditorView(before, revision, reindex);
 			if (!toolbarFocus) el.viewerPanel.focus({ preventScroll: true });
 			return true;
 		}
@@ -2439,6 +2481,7 @@ async function openOFD(file) {
 		state.objectClipboard = null;
 		state.styleClipboard = null;
 		state.editorInfo = null;
+		state.editorViews.clear();
 		state.fontRenderPending = false;
 		state.savedRevision = null;
 		canvasEditor.clear();
@@ -2910,6 +2953,7 @@ async function openDocument(options = {}) {
 			}
 		}
 		if (options.clearSelection) canvasEditor.clear();
+		if (options.selection) canvasEditor.pendingSelection = options.selection;
 		resetPageFlow(options.keepPreview);
 		renderPageList();
 		if (options.keepPreview || options.resetScroll || el.outlineList.childElementCount === 0) {
@@ -3697,9 +3741,9 @@ function copyEditorSelection(event) {
 		|| canvasEditor.input || canvasEditor.crop || canvasEditor.drag || document.body.hasAttribute("aria-busy")) return false;
 	const items = canvasEditor.items().slice().sort((a, b) => a.order - b.order);
 	const cut = event.type === "cut";
-	if (state.composite) {
+	if (state.composite && items.some(item => item.container !== items[0].container)) {
 		event.preventDefault();
-		setStatus("内部对象请用复制按钮");
+		setStatus("请选择同一组内的对象");
 		return true;
 	}
 	if (!canEditObject(canvasEditor.selected, "copy") || cut && !canEditObject(canvasEditor.selected, "delete")) {
@@ -3708,7 +3752,7 @@ function copyEditorSelection(event) {
 		return true;
 	}
 	const index = items[0].index, ids = items.map(item => item.id);
-	const clipboard = { token: crypto.randomUUID(), page: state.doc.pages[index].id, bounds: selectionBounds(items), x: 0, y: 0, cut };
+	const clipboard = { token: crypto.randomUUID(), page: state.doc.pages[index].id, scope: state.composite?.key || "", bounds: selectionBounds(items), x: 0, y: 0, cut };
 	if (canvasEditor.nudge) {
 		clipboard.bounds.x += canvasEditor.nudge.x;
 		clipboard.bounds.y += canvasEditor.nudge.y;
@@ -3719,10 +3763,10 @@ function copyEditorSelection(event) {
 	state.objectClipboard = clipboard;
 	const capture = () => {
 		const openSeq = state.openSeq, revision = state.editorInfo.revision;
-		return callWASM("ofdgoCaptureObjects", index, ids, clipboard.token).then(async () => {
+		return callWASM("ofdgoCaptureObjects", index, ids, clipboard.token, clipboard.scope).then(async () => {
 			clipboard.cut = false;
-			if (cut && openSeq === state.openSeq && revision === state.editorInfo?.revision && index === state.pageIndex && state.objectClipboard === clipboard) {
-				clipboard.cut = Boolean(await changeDocument("ofdgoDeleteObjects", { index, id: ids }));
+			if (cut && openSeq === state.openSeq && revision === state.editorInfo?.revision && index === state.pageIndex && state.objectClipboard === clipboard && clipboard.scope === (state.composite?.key || "")) {
+				clipboard.cut = Boolean(await changeDocument("ofdgoDeleteObjects", { index, id: ids, items }));
 			}
 			return true;
 		}, err => {
@@ -3753,7 +3797,7 @@ async function pasteEditorContent(event) {
 	const files = Array.from(event.clipboardData.files);
 	const value = event.clipboardData.getData("text/plain").replace(/\t/g, "    ");
 	if ((canvasEditor.nudge || canvasEditor.nudgeCommit) && !await canvasEditor.commitNudge()) return;
-	if (document.body.hasAttribute("aria-busy") || canvasEditor.input || canvasEditor.crop || canvasEditor.drag || !pageCan("insert")) return;
+	if (document.body.hasAttribute("aria-busy") || canvasEditor.input || canvasEditor.crop || canvasEditor.drag) return;
 	const index = state.pageIndex, page = state.doc.pages[index];
 	if (token) {
 		const clipboard = state.objectClipboard;
@@ -3763,6 +3807,11 @@ async function pasteEditorContent(event) {
 		}
 		const openSeq = state.openSeq;
 		if (!await clipboard.ready || openSeq !== state.openSeq || index !== state.pageIndex || state.objectClipboard !== clipboard) return;
+		if ((clipboard.scope || "") !== (state.composite?.key || "") || clipboard.scope && clipboard.page !== page.id) {
+			setStatus("请回到原编辑范围粘贴");
+			return;
+		}
+		if (!clipboard.scope && !pageCan("insert")) return;
 		const visible = visiblePageBounds(index), bounds = clipboard.bounds;
 		const offset = clipboard.page === page.id ? { x: clipboard.x + (clipboard.cut ? 0 : 3), y: clipboard.y + (clipboard.cut ? 0 : 3) } : { x: 0, y: 0 };
 		for (const [axis, size] of [["x", "width"], ["y", "height"]]) {
@@ -3772,7 +3821,7 @@ async function pasteEditorContent(event) {
 				offset[axis] = Math.max(visible[axis] + margin, Math.min(position, visible[axis] + visible[size] - margin - bounds[size])) - bounds[axis];
 			}
 		}
-		if (await changeDocument("ofdgoPasteObjects", null, index, token, offset.x, offset.y)) {
+		if (await changeDocument("ofdgoPasteObjects", null, index, token, offset.x, offset.y, clipboard.scope || "")) {
 			clipboard.page = page.id;
 			clipboard.x = offset.x;
 			clipboard.y = offset.y;
@@ -3780,6 +3829,7 @@ async function pasteEditorContent(event) {
 		}
 		return;
 	}
+	if (!pageCan("insert")) return;
 	const visible = visiblePageBounds(index), margin = Math.min(20, visible.width / 10);
 	const x = visible.x + margin, y = visible.y + Math.min(20, visible.height / 10), width = visible.width - margin * 2;
 	if (files.length) {
@@ -5554,14 +5604,14 @@ function updateObjectControls(item, reset = false) {
 	el.objectBoundsButton.disabled = disabled || cropping || !canEditObject(item, "transform");
 	el.objectAlign.disabled = disabled || cropping || !canEditObject(item, "arrange");
 	el.objectRotate.disabled = el.objectFlip.disabled = disabled || cropping || !canEditObject(item, state.composite ? "transform" : "arrange");
-	el.cropImageButton.disabled = disabled || item.type !== "ImageObject" || !canEditObject(item, "update");
-	el.imageFit.disabled = el.cropImageButton.disabled || cropping;
+	el.cropImageButton.disabled = disabled || item.type !== "ImageObject" || !canEditObject(item, "cropImage");
+	el.imageFit.disabled = el.cropImageButton.disabled || cropping || Boolean(item.scoped);
 	el.cropImageButton.textContent = cropping ? "完成" : "裁剪";
 	el.cropImageButton.setAttribute("aria-label", cropping ? "完成裁剪" : "裁剪图片");
 	el.cropImageButton.setAttribute("aria-pressed", String(cropping));
 	el.resetCropButton.textContent = cropping ? "取消" : "还原";
 	el.resetCropButton.setAttribute("aria-label", cropping ? "取消裁剪" : "还原图片");
-	el.resetCropButton.disabled = el.cropImageButton.disabled || !cropping && (!item.imageBounds || ["x", "y", "width", "height"].every(key => Math.abs(item[key] - item.imageBounds[key]) < 1e-9));
+	el.resetCropButton.disabled = el.cropImageButton.disabled || !cropping && (item.scoped || !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" ? "reflow" : item.type === "ImageObject" ? "replaceImage" : "update"));
@@ -5573,7 +5623,7 @@ function updateObjectControls(item, reset = false) {
 	el.textSize.disabled = textDisabled || text !== state.textDefaults && !item.draft && (!canEditObject(item, "reflow") || Boolean(item?.items) && !canEditObject(item, "layoutKnown"));
 	el.textColor.disabled = textDisabled || text !== state.textDefaults && !item.draft && !canEditObject(item, "paint");
 	el.textFontAdd.disabled = !state.editing || !state.ready || state.exporting;
-	el.textAlign.disabled = el.textWrap.disabled = el.textLineHeight.disabled = el.textSpacing.disabled = el.textSize.disabled || Boolean(item?.items || item?.draft) || Boolean(canvasEditor.input);
+	el.textAlign.disabled = el.textWrap.disabled = el.textLineHeight.disabled = el.textSpacing.disabled = el.textSize.disabled || Boolean(item?.items || item?.draft) || Boolean(canvasEditor.input || state.composite);
 	el.paragraphButton.disabled = el.textAlign.disabled;
 	const layoutKnown = text === state.textDefaults || Boolean(item?.draft) || canEditObject(item, "layoutKnown");
 	el.textAlign.value = layoutKnown ? text.align || "left" : "";

internal/webui/wasm.go

@@ -615,6 +615,7 @@ var currentEditor *ofdgo.Editor
 type editorClipboard struct {
 	token     string
 	objects   []ofdgo.GraphicObject
+	composite *ofdgo.CompositeSelection
 }
 
 // copiedObjects 当前对象剪贴板，不保存字体或图片的重复数据
@@ -832,7 +833,7 @@ func editorObjects(index int, text *ofdgo.PageText) ([]any, error) {
 // 返回: map[string]any 前端能力
 func editorCapabilities(capability ofdgo.ObjectCapabilities, kind string) map[string]any {
 	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, "enter": capability.Transform && (kind == "CompositeObject" || kind == "CompositeGraphicUnit")}
+		"replaceImage": capability.ReplaceImage, "cropImage": capability.CropImage, "enter": capability.Transform && (kind == "CompositeObject" || kind == "CompositeGraphicUnit")}
 	if missing := capability.MissingGlyphs; missing != nil {
 		result["missingGlyphs"] = map[string]any{"fontID": missing.FontID, "characters": missing.Characters}
 	}
@@ -926,6 +927,15 @@ func compositeObjects(args []js.Value) (any, error) {
 			object := member.Object.TextObject
 			item["text"], _ = object.TextLayout()
 			item["font"], item["fontName"], item["size"] = object.Font, fontNames[object.Font], object.Size
+			item["bounds"] = editorBox(box)
+			if member.Capabilities.Reflow {
+				inverse, _ := member.Matrix.Invert()
+				local := inverse.TransformBox(box)
+				item["textFrame"] = map[string]any{"width": math.Max(object.Size, local.X+local.W), "height": math.Max(object.Size, local.Y+local.H), "matrix": editorMatrix(member.Matrix)}
+			}
+		}
+		if member.Capabilities.CropImage {
+			item["imageBounds"] = editorBox(box)
 		}
 		objects = append(objects, item)
 	}
@@ -943,18 +953,10 @@ func changeCompositeObjects(args []js.Value) (any, error) {
 		if err != nil {
 			return err
 		}
-		var indexes []int
-		for _, id := range stringsFromJS(args[2]) {
-			part, found := strings.CutPrefix(id, key+"/")
-			if !found {
-				return fmt.Errorf("selection is outside composite")
-			}
-			i, err := strconv.Atoi(part)
+		indexes, err := compositeIndexes(key, stringsFromJS(args[2]))
 		if err != nil {
 			return err
 		}
-			indexes = append(indexes, i)
-		}
 		page := args[0].Int()
 		operation := args[3].String()
 		switch operation {
@@ -966,6 +968,13 @@ func changeCompositeObjects(args []js.Value) (any, error) {
 		case "order":
 			selected, err = currentEditor.OrderCompositeObjects(page, path, indexes, args[4].String())
 			return err
+		case "text", "textStyle":
+			return changeCompositeText(page, path, indexes, operation, args[4:])
+		case "crop":
+			if len(indexes) != 1 {
+				return fmt.Errorf("image crop requires one member")
+			}
+			return currentEditor.CropCompositeImage(page, path, indexes[0], ofdgo.Box{X: args[4].Float(), Y: args[5].Float(), W: args[6].Float(), H: args[7].Float()})
 		case "image":
 			if len(indexes) != 1 {
 				return fmt.Errorf("image replacement requires one member")
@@ -1038,6 +1047,82 @@ func changeCompositeObjects(args []js.Value) (any, error) {
 	return doc, nil
 }
 
+// compositeIndexes 将画布成员路径转换为同一范围的序号
+// 入参: key 父路径, ids 成员路径
+// 返回: []int 成员序号, error 错误信息
+func compositeIndexes(key string, ids []string) ([]int, error) {
+	indexes := make([]int, 0, len(ids))
+	for _, id := range ids {
+		part, found := strings.CutPrefix(id, key+"/")
+		if !found {
+			return nil, fmt.Errorf("selection is outside composite")
+		}
+		i, err := strconv.Atoi(part)
+		if err != nil || i < 0 {
+			return nil, fmt.Errorf("invalid composite member")
+		}
+		indexes = append(indexes, i)
+	}
+	return indexes, nil
+}
+
+// changeCompositeText 修改内部文字，嵌入字体前校验选区用字
+// 入参: page 页面索引, path 父路径, indexes 成员序号, operation 操作, args 内容及样式
+// 返回: error 错误信息
+func changeCompositeText(page int, path ofdgo.ObjectPath, indexes []int, operation string, args []js.Value) error {
+	var value *string
+	if operation == "text" {
+		if len(indexes) != 1 {
+			return fmt.Errorf("text editing requires one member")
+		}
+		if !args[0].IsNull() {
+			text := args[0].String()
+			value = &text
+		}
+		args = args[1:]
+	}
+	style := ofdgo.TextStyle{Size: args[1].Float()}
+	if !args[0].IsNull() {
+		data, err := bytesFromJS(args[0])
+		if err != nil {
+			return err
+		}
+		members, err := currentEditor.CompositeObjects(page, path)
+		if err != nil {
+			return err
+		}
+		var text strings.Builder
+		for _, index := range indexes {
+			if index >= len(members) || !members[index].Capabilities.ReplaceFont {
+				return fmt.Errorf("composite font replacement is not supported")
+			}
+			if value != nil {
+				text.WriteString(*value)
+			} else {
+				text.WriteString(members[index].Object.TextObject.Text())
+			}
+		}
+		if err := checkFontGlyphs(data, text.String()); err != nil {
+			return err
+		}
+		style.Font, err = currentEditor.AddFont(FontFile{Data: data}, 0)
+		if err != nil {
+			return err
+		}
+	}
+	if !args[2].IsNull() {
+		var fill ofdgo.FillColor
+		if err := setEditorColor(&fill, args[2].String()); err != nil {
+			return err
+		}
+		style.Color = fill.Value
+	}
+	if value != nil {
+		return currentEditor.UpdateCompositeText(page, path, indexes[0], *value, style)
+	}
+	return currentEditor.StyleCompositeText(page, path, indexes, style)
+}
+
 // editorFont 读取对象实际使用的内嵌字体，供画布输入使用
 // 入参: args 字体资源标识
 // 返回: any 字体数据, error 错误信息
@@ -1152,27 +1237,65 @@ func copyObjects(args []js.Value) (any, error) {
 }
 
 // captureObjects 保存独立选区快照，不修改文档或历史
-// 入参: args 页面索引、对象标识数组和剪贴板标识
+// 入参: args 页面索引、对象标识数组、剪贴板标识和可选父路径
 // 返回: any 空结果, error 错误信息
 func captureObjects(args []js.Value) (any, error) {
 	if currentEditor == nil {
 		return nil, fmt.Errorf("no document is being edited")
 	}
-	objects, err := currentEditor.Objects(args[0].Int(), stringsFromJS(args[1]))
+	clipboard := &editorClipboard{token: args[2].String()}
+	var err error
+	if len(args) > 3 && args[3].String() != "" {
+		key := args[3].String()
+		path, pathErr := compositePath(key)
+		if pathErr != nil {
+			return nil, pathErr
+		}
+		indexes, indexErr := compositeIndexes(key, stringsFromJS(args[1]))
+		if indexErr != nil {
+			return nil, indexErr
+		}
+		clipboard.composite, err = currentEditor.CaptureCompositeObjects(args[0].Int(), path, indexes)
+	} else {
+		clipboard.objects, err = currentEditor.Objects(args[0].Int(), stringsFromJS(args[1]))
+	}
 	if err != nil {
 		return nil, err
 	}
-	copiedObjects = &editorClipboard{args[2].String(), objects}
+	copiedObjects = clipboard
 	return nil, nil
 }
 
 // pasteObjects 将当前文档的对象快照粘贴到目标页
-// 入参: args 目标页、剪贴板标识和横纵位移
+// 入参: args 目标页、剪贴板标识、横纵位移和可选父路径
 // 返回: any 文档信息及新选区, error 错误信息
 func pasteObjects(args []js.Value) (any, error) {
 	if currentEditor == nil || copiedObjects == nil || copiedObjects.token != args[1].String() {
 		return nil, fmt.Errorf("object clipboard is no longer available")
 	}
+	if copiedObjects.composite != nil {
+		if len(args) < 5 || args[4].String() == "" {
+			return nil, fmt.Errorf("paste requires the original composite scope")
+		}
+		key := args[4].String()
+		path, err := compositePath(key)
+		if err != nil {
+			return nil, err
+		}
+		indexes, err := currentEditor.PasteCompositeObjects(args[0].Int(), path, copiedObjects.composite, args[2].Float(), args[3].Float())
+		if err != nil {
+			return nil, err
+		}
+		info, err := previewEditor(currentEditor, currentSession.Renderer.RenderAnnotations)
+		result := editorSelectionInfo{editorInfo: info}
+		for _, index := range indexes {
+			result.SelectedIDs = append(result.SelectedIDs, fmt.Sprintf("%s/%d", key, index))
+		}
+		return result, err
+	}
+	if len(args) > 4 && args[4].String() != "" {
+		return nil, fmt.Errorf("top-level objects cannot be pasted into a composite")
+	}
 	return copyEditorObjects(args[0].Int(), copiedObjects.objects, args[2].Float(), args[3].Float())
 }
 

ofdgo_editor_composite.go

@@ -17,6 +17,7 @@ package ofdgo
 import (
 	"bytes"
 	"encoding/xml"
+	"errors"
 	"fmt"
 	"maps"
 	"math"
@@ -33,13 +34,14 @@ type ObjectPath struct {
 }
 
 // CompositeMember 复合对象的直接成员快照，Object包含有效样式，不用于整体替换原对象
-// Bounds与Contours使用页面毫米坐标，StrokeScale为对象描边到页面的倍率
+// Bounds与Contours使用页面毫米坐标，Matrix将对象局部坐标映射至页面，StrokeScale为描边倍率
 // Position表示当前范围内的直接容器位置，结构操作后需重新枚举
 type CompositeMember struct {
 	Object       GraphicObject
 	Bounds       Box
 	Contours     []ObjectContour
 	StrokeScale  float64
+	Matrix       Matrix
 	Capabilities ObjectCapabilities
 	Position     ObjectPosition
 	Transform    bool
@@ -380,10 +382,24 @@ func (e *Editor) measureCompositeMembers(renderer *Renderer, nodes []*editorComp
 		if err != nil {
 			style = cloneEditorData(node.object)
 		}
+		if transform && err == nil && node.object.Type == "TextObject" && editorXMLSupported(node.node) {
+			capability.ReplaceFont = true
+			text := cloneEditorData(style.TextObject)
+			if err := e.prepareText(&text); err != nil {
+				capability.ReasonCode, capability.Reason = editReason(err), err.Error()
+				errors.As(err, &capability.MissingGlyphs)
+			} else if _, err := text.TextFrame(); err == nil {
+				capability.Reflow = text.ReadDirection == 0 && text.CharDirection == 0
+			}
+		}
+		if transform && node.object.Type == "ImageObject" && bounds.box.W > 0 && bounds.box.H > 0 {
+			clips := node.object.ImageObject.Clips
+			_, capability.CropImage = node.matrix(clips == nil || clips.TransFlag == nil || *clips.TransFlag).Invert()
+		}
 		_, ctm := editorGeometry(node.object)
 		matrix := node.parent.Multiply(NewMatrix(ctm))
 		position := positions[node.span.parent]
-		result[i] = CompositeMember{Object: style, Bounds: bounds.box, Contours: bounds.contours, StrokeScale: math.Sqrt(math.Abs(matrix.a*matrix.d - matrix.b*matrix.c)), Capabilities: capability, Position: position, Transform: transform}
+		result[i] = CompositeMember{Object: style, Bounds: bounds.box, Contours: bounds.contours, Matrix: node.matrix(true), StrokeScale: math.Sqrt(math.Abs(matrix.a*matrix.d - matrix.b*matrix.c)), Capabilities: capability, Position: position, Transform: transform}
 		position.Index++
 		positions[node.span.parent] = position
 	}
@@ -537,11 +553,7 @@ func (e *Editor) changeCompositeObjects(page int, path ObjectPath, indexes []int
 // 入参: page 页面索引, path 父路径, indexes 成员序号, edit 修改回调
 // 返回: error 错误信息
 func (e *Editor) editCompositeObjects(page int, path ObjectPath, indexes []int, edit func(*Renderer, []*editorCompositeNode, []CompositeMember) error) (err error) {
-	reader, renderer, root, nodes, err := e.compositeScope(page, path)
-	if err != nil {
-		return err
-	}
-	defer reader.Close()
+	return e.editCompositeScope(page, path, func(renderer *Renderer, _ *editorCompositeNode, nodes []*editorCompositeNode) error {
 		members := e.measureCompositeMembers(renderer, nodes)
 		selected := make(map[int]bool)
 		var selectedNodes []*editorCompositeNode
@@ -557,6 +569,19 @@ func (e *Editor) editCompositeObjects(page int, path ObjectPath, indexes []int,
 		if len(selected) == 0 {
 			return nil
 		}
+		return edit(renderer, selectedNodes, selectedMembers)
+	})
+}
+
+// editCompositeScope 原子提交内部范围修改，支持向空容器粘贴并在失败时回收新增资源
+// 入参: page 页面索引, path 父路径, edit 修改回调
+// 返回: error 错误信息
+func (e *Editor) editCompositeScope(page int, path ObjectPath, edit func(*Renderer, *editorCompositeNode, []*editorCompositeNode) error) (err error) {
+	reader, renderer, root, nodes, err := e.compositeScope(page, path)
+	if err != nil {
+		return err
+	}
+	defer reader.Close()
 	count, maximum := len(e.resources), e.maxID
 	ready := e.source.idsReady
 	defer func() {
@@ -577,7 +602,7 @@ func (e *Editor) editCompositeObjects(page int, path ObjectPath, indexes []int,
 	if err = e.prepareSourceIDs(); err != nil {
 		return err
 	}
-	if err = edit(renderer, selectedNodes, selectedMembers); err != nil {
+	if err = edit(renderer, root, nodes); err != nil {
 		return err
 	}
 	data, changed, err := e.writeCompositeNode(root)

ofdgo_editor_composite_copy.go

@@ -0,0 +1,186 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"fmt"
+	"slices"
+)
+
+// CompositeSelection 同一内部容器的独立选区快照，共享不可变字体和图片资源
+// 仅可粘贴回当前Editor的原范围，源对象修改或删除不改变快照，不用于跨文档交换
+// 父路径的祖先成员增删或排序后需重新捕获，避免使用已失效的序号路径
+type CompositeSelection struct {
+	editor     *Editor
+	page       string
+	path       ObjectPath
+	references int
+	containers []int
+	nodes      []*editorCompositeNode
+}
+
+// CaptureCompositeObjects 捕获内部选区，不修改文档或分配资源
+// 入参: page 页面索引, path 父复合路径, indexes 同一容器的成员序号
+// 返回: *CompositeSelection 独立快照, error 错误信息
+func (e *Editor) CaptureCompositeObjects(page int, path ObjectPath, indexes []int) (*CompositeSelection, error) {
+	reader, renderer, root, nodes, err := e.compositeScope(page, path)
+	if err != nil {
+		return nil, err
+	}
+	defer reader.Close()
+	if len(indexes) == 0 {
+		return nil, fmt.Errorf("composite selection is empty")
+	}
+	indexes = slices.Clone(indexes)
+	slices.Sort(indexes)
+	members := e.measureCompositeMembers(renderer, nodes)
+	var owner *editorCompositeNode
+	var container *editorXML
+	selection := &CompositeSelection{editor: e, page: e.pages[page].ID, path: ObjectPath{ID: path.ID, Children: slices.Clone(path.Children)}}
+	for j, i := range indexes {
+		if i < 0 || i >= len(nodes) || j > 0 && indexes[j-1] == i || !members[i].Capabilities.Copy {
+			return nil, fmt.Errorf("invalid composite copy selection")
+		}
+		node := nodes[i]
+		if j == 0 {
+			owner, container = node.owner, node.span.parent
+		} else if node.span.parent != container {
+			return nil, fmt.Errorf("copy requires members in the same container")
+		}
+		copy := *node
+		copy.owner, copy.span = nil, nil
+		selection.nodes = append(selection.nodes, &copy)
+	}
+	scope := root.loadedScope(path.Children)
+	for scope != owner {
+		scope = scope.ref
+		selection.references++
+	}
+	for node := container; node != owner.node; node = node.parent {
+		containers := compositeContainers(node.parent)
+		selection.containers = append(selection.containers, slices.Index(containers, node))
+	}
+	slices.Reverse(selection.containers)
+	return selection, nil
+}
+
+// PasteCompositeObjects 将快照粘贴至原内部容器末尾，不依赖源成员当前的序号或存在性
+// 位移使用当前父变换下的页面毫米，父容器和继承样式沿用当前范围，提交一次撤销记录
+// 入参: page 页面索引, path 父复合路径, selection 捕获的快照, dx、dy 页面位移
+// 返回: []int 新成员序号, error 错误信息
+func (e *Editor) PasteCompositeObjects(page int, path ObjectPath, selection *CompositeSelection, dx, dy float64) ([]int, error) {
+	if selection == nil || selection.editor != e || path.ID != selection.path.ID || !slices.Equal(path.Children, selection.path.Children) {
+		return nil, fmt.Errorf("paste requires the original composite scope")
+	}
+	if !finite(dx) || !finite(dy) {
+		return nil, fmt.Errorf("paste requires finite offsets")
+	}
+	var result []int
+	err := e.editCompositeScope(page, path, func(renderer *Renderer, root *editorCompositeNode, _ []*editorCompositeNode) error {
+		if e.pages[page].ID != selection.page {
+			return fmt.Errorf("paste requires the original page")
+		}
+		scope := root.loadedScope(path.Children)
+		owner := scope
+		for i := 0; i < selection.references; i++ {
+			owner = owner.ref
+			if owner == nil {
+				return fmt.Errorf("composite resource container no longer exists")
+			}
+		}
+		container := owner.node
+		for _, index := range selection.containers {
+			containers := compositeContainers(container)
+			if index >= len(containers) {
+				return fmt.Errorf("composite page block no longer exists")
+			}
+			container = containers[index]
+		}
+		box, _ := ParseBox(owner.object.CompositeGraphicUnit.Boundary)
+		parent := owner.parent.Multiply(TranslationMatrix(box.X, box.Y)).Multiply(NewMatrix(owner.object.CompositeGraphicUnit.CTM))
+		nodes := make([]*editorCompositeNode, len(selection.nodes))
+		for i, node := range selection.nodes {
+			copy := *node
+			copy.parent, copy.boundaryInCTM = parent, owner.boundaryInCTM
+			nodes[i] = &copy
+		}
+		data, err := e.copyCompositeNodes(renderer, nodes, dx, dy)
+		if err != nil {
+			return err
+		}
+		next, reached := 0, false
+		var count func(*editorCompositeNode)
+		count = func(node *editorCompositeNode) {
+			if node.ref != nil {
+				count(node.ref)
+			}
+			if reached {
+				return
+			}
+			for _, child := range node.children {
+				if node != owner || child.span.start < container.close {
+					next++
+				}
+			}
+			reached = node == owner
+		}
+		count(scope)
+		patch := editorXMLPatch{container.close, container.close, data}
+		if container.open == container.end {
+			patch = editorXMLContent(owner.data, container, data)
+		}
+		owner.patches = append(owner.patches, patch)
+		for i := range nodes {
+			result = append(result, next+i)
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return result, nil
+}
+
+// loadedScope 获取已由compositeScope展开并校验的范围
+// 入参: path 逐层成员序号
+// 返回: *editorCompositeNode 范围节点
+func (n *editorCompositeNode) loadedScope(path []int) *editorCompositeNode {
+	for _, index := range path {
+		var nodes []*editorCompositeNode
+		var collect func(*editorCompositeNode)
+		collect = func(node *editorCompositeNode) {
+			if node.ref != nil {
+				collect(node.ref)
+			}
+			nodes = append(nodes, node.children...)
+		}
+		collect(n)
+		n = nodes[index]
+	}
+	return n
+}
+
+// compositeContainers 获取直接内容容器，序号不随绘制成员增删变化
+// 入参: node 父节点
+// 返回: []*editorXML 内容容器与页块
+func compositeContainers(node *editorXML) []*editorXML {
+	var result []*editorXML
+	for _, child := range node.children {
+		if child.name.Local == "Content" || child.name.Local == "PageBlock" {
+			result = append(result, child)
+		}
+	}
+	return result
+}

ofdgo_editor_composite_image.go

@@ -0,0 +1,107 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"bytes"
+	"encoding/xml"
+	"fmt"
+)
+
+// matrix 获取对象局部坐标到页面的变换，兼容旧式内联边界
+// 入参: transform 是否包含对象CTM
+// 返回: Matrix 坐标变换
+func (n *editorCompositeNode) matrix(transform bool) Matrix {
+	boundary, ctm := editorGeometry(n.object)
+	box, _ := ParseBox(boundary)
+	m := IdentityMatrix
+	if transform {
+		m = NewMatrix(ctm)
+		if n.object.Type == "ImageObject" && ctm == "" {
+			m = Matrix{a: box.W, d: box.H}
+		}
+	}
+	if n.boundaryInCTM {
+		return n.parent.Multiply(TranslationMatrix(box.X, box.Y)).Multiply(m)
+	}
+	if !transform {
+		return TranslationMatrix(box.X, box.Y)
+	}
+	return TranslationMatrix(box.X, box.Y).Multiply(n.parent).Multiply(m)
+}
+
+// CropCompositeImage 将内部图片与页面矩形取交集，保留原裁剪、蒙版、变换和边框
+// 只收窄可见区域，撤销恢复上次裁剪，不重采样图片
+// 入参: page 页面索引, path 父复合路径, index 图片序号, box 页面毫米范围
+// 返回: error 错误信息
+func (e *Editor) CropCompositeImage(page int, path ObjectPath, index int, box Box) error {
+	if _, err := creationBox(editorBoxString(box)); err != nil {
+		return err
+	}
+	return e.editCompositeObjects(page, path, []int{index}, func(_ *Renderer, nodes []*editorCompositeNode, members []CompositeMember) error {
+		node, member := nodes[0], members[0]
+		if !member.Capabilities.CropImage {
+			return fmt.Errorf("composite image cannot be cropped")
+		}
+		before := member.Bounds
+		if box.X <= before.X && box.Y <= before.Y && box.X+box.W >= before.X+before.W && box.Y+box.H >= before.Y+before.H {
+			return nil
+		}
+		if box.X+box.W <= before.X || box.Y+box.H <= before.Y || box.X >= before.X+before.W || box.Y >= before.Y+before.H {
+			return fmt.Errorf("crop does not intersect the image")
+		}
+		clips := node.object.ImageObject.Clips
+		inverse, _ := node.matrix(clips == nil || clips.TransFlag == nil || *clips.TransFlag).Invert()
+		shape, err := NewShape(ShapeRectangle, box)
+		if err != nil {
+			return err
+		}
+		fill, stroke := true, false
+		shape.Fill, shape.Stroke = &fill, &stroke
+		data, err := encodeOFDXML(func(x *ofdXML) {
+			x.clips(&Clips{Clip: []Clip{{Area: []ClipArea{{CTM: inverse.String(), Path: []PathObject{shape}}}}}})
+		})
+		if err != nil {
+			return err
+		}
+		data = bytes.TrimPrefix(data, []byte(xml.Header))
+		root, err := parseEditorXML(data)
+		if err != nil {
+			return err
+		}
+		var patch editorXMLPatch
+		if original := node.node.child("Clips"); original != nil {
+			clip, err := editorXMLStandalone(data[root.children[0].start:root.children[0].end], root.children[0])
+			if err != nil {
+				return err
+			}
+			content := append(bytes.Clone(node.data[original.open:original.close]), clip...)
+			patch = editorXMLContent(node.data, original, content)
+		} else {
+			data, err = editorXMLStandalone(data, root)
+			if err != nil {
+				return err
+			}
+			content := append(data, node.data[node.node.open:node.node.close]...)
+			patch = editorXMLContent(node.data, node.node, content)
+		}
+		updated, err := newEditorCompositeNode(editorPatchXML(node.data, []editorXMLPatch{patch}))
+		if err != nil {
+			return err
+		}
+		node.data, node.node, node.object, node.changed = updated.data, updated.node, updated.object, true
+		return nil
+	})
+}

ofdgo_editor_composite_ops.go

@@ -60,24 +60,10 @@ func (e *Editor) CopyCompositeObjects(page int, path ObjectPath, indexes []int,
 			}
 		}
 		slices.SortFunc(nodes, func(a, b *editorCompositeNode) int { return a.index - b.index })
-		ids := make(map[string]string)
-		for _, node := range nodes {
-			if err := e.collectCompositeIDs(node.node, ids); err != nil {
-				return err
-			}
-		}
-		var data []byte
-		for _, node := range nodes {
-			copy := *node
-			if err := e.transformCompositeMember(renderer, &copy, TranslationMatrix(dx, dy)); err != nil {
-				return err
-			}
-			fragment, err := editorXMLRemapIDs(copy.data, copy.node, ids)
+		data, err := e.copyCompositeNodes(renderer, nodes, dx, dy)
 		if err != nil {
 			return err
 		}
-			data = append(data, fragment...)
-		}
 		owner := nodes[0].owner
 		owner.patches = append(owner.patches, editorXMLPatch{container.close, container.close, data})
 		next := 0
@@ -97,6 +83,31 @@ func (e *Editor) CopyCompositeObjects(page int, path ObjectPath, indexes []int,
 	return result, nil
 }
 
+// copyCompositeNodes 复制成员原文并统一重映射标识，保持副本之间的引用
+// 入参: renderer 渲染器, nodes 快照, dx、dy 页面位移
+// 返回: []byte 副本XML, error 错误信息
+func (e *Editor) copyCompositeNodes(renderer *Renderer, nodes []*editorCompositeNode, dx, dy float64) ([]byte, error) {
+	ids := make(map[string]string)
+	for _, node := range nodes {
+		if err := e.collectCompositeIDs(node.node, ids); err != nil {
+			return nil, err
+		}
+	}
+	var data []byte
+	for _, node := range nodes {
+		copy := *node
+		if err := e.transformCompositeMember(renderer, &copy, TranslationMatrix(dx, dy)); err != nil {
+			return nil, err
+		}
+		fragment, err := editorXMLRemapIDs(copy.data, copy.node, ids)
+		if err != nil {
+			return nil, err
+		}
+		data = append(data, fragment...)
+	}
+	return data, nil
+}
+
 // OrderCompositeObjects 调整同一直接容器内的绘制顺序，不改变页块和其他实例
 // 入参: page 页面索引, path 父复合路径, indexes 成员序号, order 为up、down、top或bottom
 // 返回: []int 调整后的选区序号, error 错误信息

ofdgo_editor_composite_text.go

@@ -0,0 +1,115 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"fmt"
+	"image/color"
+	"strconv"
+)
+
+// UpdateCompositeText 修改内部普通横向文字，保留首行起点、变换、裁剪及未修改属性
+// 复杂字形定位不自动重排，空样式保留原字体、字号和颜色
+// 入参: page 页面索引, path 父复合路径, index 成员序号, value 文字, style 文字样式增量
+// 返回: error 错误信息
+func (e *Editor) UpdateCompositeText(page int, path ObjectPath, index int, value string, style TextStyle) error {
+	return e.changeCompositeText(page, path, []int{index}, &value, style)
+}
+
+// StyleCompositeText 批量修改内部文字字体、字号或颜色，换字体保留原文字定位
+// 字体缺字或复杂字形映射使整批操作失败，不使用回退字体代替原文
+// 入参: page 页面索引, path 父复合路径, indexes 成员序号, style 文字样式增量
+// 返回: error 错误信息
+func (e *Editor) StyleCompositeText(page int, path ObjectPath, indexes []int, style TextStyle) error {
+	return e.changeCompositeText(page, path, indexes, nil, style)
+}
+
+// changeCompositeText 生成独立文字副本，全部校验通过后合并原文
+// 入参: page 页面索引, path 父复合路径, indexes 成员序号, value 新内容，nil保留定位, style 样式增量
+// 返回: error 错误信息
+func (e *Editor) changeCompositeText(page int, path ObjectPath, indexes []int, value *string, style TextStyle) error {
+	return e.editCompositeObjects(page, path, indexes, func(_ *Renderer, nodes []*editorCompositeNode, members []CompositeMember) error {
+		for i, node := range nodes {
+			member := members[i]
+			if node.object.Type != "TextObject" || !member.Capabilities.ReplaceFont {
+				return fmt.Errorf("composite text style is not supported")
+			}
+			object := cloneEditorData(node.object)
+			text := cloneEditorData(member.Object.TextObject)
+			if style.Font != "" {
+				text.Font = style.Font
+			}
+			content := text.Text()
+			if value != nil {
+				content = *value
+			}
+			if content != text.Text() || style.Size != 0 && style.Size != text.Size {
+				if style.Size != 0 {
+					text.Size = style.Size
+				}
+				if err := e.layoutCompositeText(&text, content); err != nil {
+					return err
+				}
+				object.TextObject.Size, object.TextObject.TextCode = text.Size, text.TextCode
+			}
+			if style.Font != "" && style.Font != object.TextObject.Font {
+				if err := e.prepareText(&text); err != nil {
+					return err
+				}
+				object.TextObject.Font = style.Font
+			}
+			if style.Color != "" {
+				if err := creationColor(&FillColor{Value: style.Color}); err != nil {
+					return err
+				}
+				var r, g, b float64
+				fmt.Sscan(style.Color, &r, &g, &b)
+				fill, err := e.RGBColor(color.NRGBA{R: uint8(r), G: uint8(g), B: uint8(b), A: 255})
+				if err != nil {
+					return err
+				}
+				object.TextObject.FillColor = editorStyleColor(fill, member.Object.TextObject.FillColor)
+			}
+			if err := node.update(object); err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+}
+
+// layoutCompositeText 重排普通文字并保持原首行基线起点
+// 入参: text 有效文字样式, value 新内容
+// 返回: error 错误信息
+func (e *Editor) layoutCompositeText(text *TextObject, value string) error {
+	if len(text.TextCode) == 0 {
+		return fmt.Errorf("text codes are empty")
+	}
+	origin, err := creationNumbers(text.TextCode[0].X+" "+text.TextCode[0].Y, 2)
+	if err != nil {
+		return err
+	}
+	if err := e.LayoutText(text, value, TextLayout{}); err != nil {
+		return err
+	}
+	baseline, _ := strconv.ParseFloat(text.TextCode[0].Y, 64)
+	for i := range text.TextCode {
+		code := &text.TextCode[i]
+		cx, _ := strconv.ParseFloat(code.X, 64)
+		cy, _ := strconv.ParseFloat(code.Y, 64)
+		code.X, code.Y = ofdNumber(cx+origin[0]), ofdNumber(cy+origin[1]-baseline)
+	}
+	return e.prepareText(text)
+}

ofdgo_editor_font.go

@@ -196,6 +196,11 @@ func (e *Editor) subsetFonts(progress editorProgress) (map[string][]byte, error)
 			used[resource.font.ID] = make(map[uint16]bool)
 		}
 	}
+	if len(used) == 0 {
+		return nil, progress.report("fonts", 0, 0)
+	}
+	refs := editorResourceRefs{ids: make(map[string]bool), files: make(map[string]bool)}
+	composite := false
 	total := len(e.pages) + len(e.resources)
 	for i, page := range e.pages {
 		if err := progress.report("fonts", i, total); err != nil {
@@ -203,6 +208,23 @@ func (e *Editor) subsetFonts(progress editorProgress) (map[string][]byte, error)
 		}
 		for _, layer := range page.Content.Layer {
 			for _, object := range layer.Objects {
+				if object.Type == "CompositeObject" || object.Type == "CompositeGraphicUnit" {
+					composite = true
+					origin := e.objectOrigin(editorObjectID(object))
+					if origin == nil {
+						return nil, nil
+					}
+					data, err := editorXMLObject(origin.data, origin.node, origin.object, object)
+					if err == nil {
+						data, err = editorXMLStandalone(data, origin.node)
+					}
+					if err != nil {
+						return nil, err
+					}
+					if _, safe := refs.scan(bytes.NewReader(data), "Page.xml"); !safe {
+						return nil, nil
+					}
+				}
 				if object.Type != "TextObject" {
 					continue
 				}
@@ -219,6 +241,30 @@ func (e *Editor) subsetFonts(progress editorProgress) (map[string][]byte, error)
 			}
 		}
 	}
+	if composite {
+		_, _, _, files := e.usedResources()
+		for i, resource := range e.resources {
+			if resource.composite == "" || !slices.Contains(files, resource.name) {
+				continue
+			}
+			if err := progress.report("fonts", len(e.pages)+i, total); err != nil {
+				return nil, err
+			}
+			if _, safe := refs.scan(bytes.NewReader(resource.data), resource.name); !safe {
+				return nil, nil
+			}
+		}
+		for id, usage := range refs.fonts {
+			glyphs := used[id]
+			if usage.unsafe || len(usage.glyphs) != 0 {
+				delete(used, id)
+			} else if glyphs != nil {
+				for char := range usage.chars {
+					glyphs[e.fonts[id].GlyphIndex(char)] = true
+				}
+			}
+		}
+	}
 	result := make(map[string][]byte)
 	for i := range e.resources {
 		if err := progress.report("fonts", len(e.pages)+i, total); err != nil {

ofdgo_editor_open.go

@@ -62,13 +62,14 @@ type editorSourcePage struct {
 // Update表示完整替换内容，ReplaceFont表示可显式替换文字字体，Transform表示保留文字定位的几何变换，Order仅限同一图层或末级页块
 // Arrange表示可准确度量对齐与旋转范围；Reflow表示可重排文字，LayoutKnown表示段落选项可恢复
 // 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，内部成员保留原布局，不开放裁剪或重新适应
+// 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
 type ObjectCapabilities struct {
 	Update        bool
 	Paint         bool
 	ReplaceFont   bool
 	ReplaceImage  bool
+	CropImage     bool
 	Reflow        bool
 	LayoutKnown   bool
 	Transform     bool
@@ -358,6 +359,7 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 	origin := e.objectOrigin(id)
 	if origin == nil {
 		all.ReplaceImage = object.Type == "ImageObject"
+		all.CropImage = all.ReplaceImage
 		return all, nil
 	}
 	node := origin.node
@@ -388,6 +390,7 @@ func (e *Editor) ObjectCapabilities(page int, id string) (ObjectCapabilities, er
 	}
 	all.Paint = all.Paint && e.editorPaintable(object)
 	all.ReplaceImage = all.Update && object.Type == "ImageObject"
+	all.CropImage = all.ReplaceImage
 	if object.Type == "ImageObject" && object.ImageObject.Border != nil && len(object.ImageObject.Actions) != 0 {
 		all.Transform, all.Arrange = false, false
 		all.Reason, all.ReasonCode = "image actions cannot be transformed together with the border", EditUnsupportedObject