feat(编辑能力): 优化分布操作，提前禁用无效方向

assets/webui/ofdgo.js

@@ -110,6 +110,7 @@ function createDocumentState() {
 		styleOriginal: null,
 		objectClipboardToken: null,
 		styleClipboard: null,
+		objectDistribution: null,
 		outlineExpanded: new Map(),
 		textFonts: [],
 		textFontID: null,
@@ -1260,7 +1261,7 @@ el.objectAlign.addEventListener("change", () => {
 el.objectDistribute.addEventListener("change", () => {
 	const axis = el.objectDistribute.value;
 	el.objectDistribute.value = "";
-	if (axis && canvasEditor.items().length >= 3) {
+	if (axis && !el.objectDistribute.disabled && state.objectDistribution?.axes?.includes(axis)) {
 		return changeDocument("ofdgoDistributeObjects", canvasEditor.selected, axis);
 	}
 });
@@ -12746,6 +12747,30 @@ function updateEditorTools() {
 	updateObjectControls(canvasEditor.selected);
 }
 
+function updateObjectDistribution(item, disabled) {
+	const tab = documentTab(), state = tab.state;
+	const ids = item?.items?.slice().sort((a, b) => a.order - b.order).map(member => member.id) || [];
+	if (disabled || ids.length < 3) state.objectDistribution = null;
+	else {
+		const { openSeq, wasmSeq } = state, revision = state.editorInfo?.revision;
+		const key = JSON.stringify([openSeq, wasmSeq, revision, item.index, ids]);
+		if (state.objectDistribution?.key !== key) {
+			const request = state.objectDistribution = { key, axes: [] };
+			const current = () => !tab.closed && state.objectDistribution === request && state.openSeq === openSeq && state.wasmSeq === wasmSeq && state.editorInfo?.revision === revision;
+			callTabWASM(tab, "ofdgoDistributionAxes", item.index, ids).then(axes => {
+				if (!current()) return;
+				request.axes = axes;
+				if (isForegroundDocument(tab)) updateObjectControls(canvasEditor.selected);
+			}).catch(error => {
+				if (current() && isForegroundDocument(tab)) showError(error, false);
+			});
+		}
+	}
+	const axes = state.objectDistribution?.axes || [];
+	el.objectDistribute.disabled = disabled || !axes.length;
+	for (const option of el.objectDistribute.options) if (option.value) option.disabled = !axes.includes(option.value);
+}
+
 function updateObjectControls(item, reset = false) {
 	const members = item?.items || (item ? [item] : []);
 	const disabled = !item || Boolean(item.draft) || !state.ready || state.exporting;
@@ -12763,7 +12788,7 @@ function updateObjectControls(item, reset = false) {
 	el.cropImageButton.setAttribute("data-pressed", String(cropping));
 	el.resetCropButton.textContent = cropping ? "取消" : "还原";
 	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;
+	updateObjectDistribution(item, el.objectAlign.disabled);
 	el.editObjectButton.disabled = disabled || (item.items ? !item.items.every(member => member.type === "TextObject" && !member.richText)
 		: !canEditObject(item, "children") && (item.type === "PathObject"
 		|| !(item.type === "TextObject" && canEditObject(item, "rewriteText")) && !canEditObject(item, item.type === "TextObject" ? "textContent" : item.type === "ImageObject" ? "replaceImage" : "update")));

internal/webui/webui.go

@@ -5703,6 +5703,20 @@ func (e *businessEngine) orderObjects(args []platformValue) (any, error) {
 	})
 }
 
+// distributionAxes 获取画布选区可用的等间距分布方向
+// 入参: args 页面索引和画布对象标识数组
+// 返回: any 可用方向, error 路径或度量错误
+func (e *businessEngine) distributionAxes(args []platformValue) (any, error) {
+	if e.currentEditor == nil {
+		return nil, fmt.Errorf("no document is being edited")
+	}
+	paths, err := e.editorTargetPaths(e.stringsFromJS(args[1]))
+	if err != nil {
+		return nil, err
+	}
+	return e.currentEditor.DistributionAxes(args[0].Int(), paths)
+}
+
 // distributeObjects 按指定轴等距分布选区
 // 入参: args 页面索引、对象标识数组和分布轴
 // 返回: any 文档信息, error 错误信息
@@ -8159,6 +8173,7 @@ func (e *businessEngine) businessCommands() map[string]func([]platformValue) (an
 		"ofdgoImportObjects":          e.importObjects,
 		"ofdgoOrderObjects":           e.orderObjects,
 		"ofdgoDistributeObjects":      e.distributeObjects,
+		"ofdgoDistributionAxes":       e.distributionAxes,
 		"ofdgoRotateObjects":          e.rotateObjects,
 		"ofdgoFlipObjects":            e.flipObjects,
 		"ofdgoCropImage":              e.cropImage,

ofdgo_editor_selection.go

@@ -808,6 +808,40 @@ func (e *Editor) ResizeTargets(page int, paths []ObjectPath, box Box) error {
 	return e.TransformTargets(page, paths, Matrix{a: sx, d: sy, e: box.X - bounds.X*sx, f: box.Y - bounds.Y*sy})
 }
 
+// DistributionAxes 获取选区可保持位置顺序的等间距分布方向，不修改文档或历史
+// 入参: page 页面索引, paths 按绘制顺序排列的完整路径
+// 返回: []string 可用的horizontal和vertical方向, error 路径或度量错误
+func (e *Editor) DistributionAxes(page int, paths []ObjectPath) ([]string, error) {
+	objects, annotations, groups, err := editorTargetGroups(paths)
+	if err != nil {
+		return nil, err
+	}
+	var boxes []Box
+	var positions []editorObjectPosition
+	if len(groups) == 0 {
+		boxes, positions, _, err = e.selectionGeometry(page, objects, annotations)
+	} else {
+		boxes, _, _, err = e.targetGeometry(page, paths)
+		positions = make([]editorObjectPosition, len(paths))
+		for i := range positions {
+			positions[i].index = i
+		}
+	}
+	if err != nil {
+		return nil, err
+	}
+	axes := []string{}
+	if len(boxes) < 3 {
+		return axes, nil
+	}
+	for _, axis := range []string{"horizontal", "vertical"} {
+		if _, err := editorDistribution(boxes, positions, axis); err == nil {
+			axes = append(axes, axis)
+		}
+	}
+	return axes, nil
+}
+
 // ArrangeTargets 对齐或等距分布跨容器选区，单选对齐页面
 // 入参: page 页面索引, paths 按绘制顺序排列的完整路径, distribute 是否分布, direction 对齐方向或分布轴
 // 返回: error 路径、方向或编辑错误