命名审查与垃圾代码清理（纯重命名 / 死代码删除，无行为变更）

前提：加载完成后全部采样都已驻留内存，程序此后与源文件再无联系。
据此修正了一批会让人误以为"仍在读写文件"的命名：

- SampleFileAt → SampleSignalAt（取的是内存信号在给定时刻的采样值）。
- DataSet::AddPreparedFile → AddDataFile。
- PlotView::InvalidatePolylineCache → InvalidateDerivedCaches
  （它同时清空折线、边沿统计、中心平均值曲线、静态场景缓存与悬停引用）。
- PlotView::CursorColor(int which) → CursorColor()（两条光标同色，参数从未使用）。
- UiEllipsize(g,…) → UiEllipsize(…)：纯测量不绘制，删掉被忽略的绘图上下文参数；
  同时删除与 UiMeasureTextWidth 完全重复的 UiTextWidth，调用点统一到 UiMeasureTextWidth。

清理残留参数（(void)xxx;）：
- TabConfig 的可见性/网格族（SetVisible / ToggleVisible / SetFileVisible / SetAllVisible /
  SoloSignal / SetMode / SyncLanes / FileHasVisible / FileAllVisible）去掉从未使用的
  const DataSet& 参数（仅 SyncToDataSet 真正需要数据层，保留）。
- PlotView::OnLButtonUp(int y)、OnMouseWheel(int delta, bool shift)；PainterSignalHalo 去掉未用的 ref。
- BuildDataFile 中未使用的局部 rowCount。

删除无人调用的死函数：
  DataSet::Clear / AddFromTable；SignalColorCount；WideToUtf8 / StartsWith；
  PlotView::ViewMinTime / ViewMaxTime / EdgePanelRect / EdgePanelCloseRect /
  EdgeCenterPanelRect / ScaleLaneRange / BeginLaneValueEdit / LaneContentHeight；
  SignalPanel::NeedsScrollBar / IsFilterEditing / FilterText / ContentHeight；
  PopupMenu::EditingItemId；TabBar::IsDragging；TextEdit::PlaceCaret。

删除只写不读的死字段：CsvTable::sourceRowCount（与 rowCount 等义）与 skippedRowCount。

以 VERY_BIG_DATA.CSV 回归验证：加载与勾选、筛选框（含"无匹配的筛选信号"）、
样式区线宽文案省略、选区放大（横向与纵向）、双光标读数与 Δt、右键菜单（Y 轴数值与
实验性功能子菜单）、合并/拆分网格、标签与信号重命名省略号，行为均与改动前一致；
make clean && make all 无任何警告。

Utilities/Src/CsvTable.cpp

@@ -303,11 +303,6 @@ namespace jdi
 				return true;
 			}
 
-			if (state.fields.size() != table.headers.size())
-			{
-				++table.skippedRowCount;
-			}
-
 			bool rowHasValue = false;
 			for (std::size_t column = 0; column < state.rowValues.size(); ++column)
 			{
@@ -332,7 +327,6 @@ namespace jdi
 				table.columns[column].push_back(state.rowValues[column]);
 			}
 			++table.rowCount;
-			++table.sourceRowCount;
 			return true;
 		}
 	}

Utilities/Src/DataModel.cpp

@@ -464,7 +464,6 @@ namespace jdi
 		}
 
 		const std::size_t columnCount = table.headers.size();
-		const std::size_t rowCount = table.rowCount;
 		if (table.columns.size() < columnCount)
 		{
 			error = L"数据表列结构不完整。";
@@ -599,18 +598,12 @@ namespace jdi
 		}
 		file.minTime = tMin;
 		file.maxTime = tMax;
-		(void)rowCount;
 		return true;
 	}
 
 	// ============================ DataSet ============================
 
-	void DataSet::Clear()
-	{
-		m_files.clear();
-	}
-
-	bool DataSet::AddPreparedFile(DataFile&& file, int& fileIndex)
+	bool DataSet::AddDataFile(DataFile&& file, int& fileIndex)
 	{
 		fileIndex = -1;
 		if (file.signals.empty())
@@ -622,21 +615,6 @@ namespace jdi
 		return true;
 	}
 
-	bool DataSet::AddFromTable(const CsvTable& table, const std::wstring& filePath, std::wstring& error,
-	                           int& fileIndex)
-	{
-		fileIndex = -1;
-
-		// 兼容入口：复制一份表格后走与后台加载完全一致的构建流程。
-		CsvTable local = table;
-		DataFile file;
-		if (!BuildDataFile(std::move(local), filePath, SignalCount(), file, error))
-		{
-			return false;
-		}
-		return AddPreparedFile(std::move(file), fileIndex);
-	}
-
 	bool DataSet::InsertDerivedSignal(int fileIndex, int afterSignalIndex, SignalData&& signal,
 	                                  int& newSignalIndex)
 	{
@@ -992,7 +970,8 @@ namespace jdi
 		return best;
 	}
 
-	bool SampleFileAt(const DataFile& file, const SignalData& signal, double time, bool interpolate, double& value)
+	bool SampleSignalAt(const DataFile& file, const SignalData& signal, double time, bool interpolate,
+	                    double& value)
 	{
 		value = kMissing;
 
@@ -1093,7 +1072,7 @@ namespace jdi
 		                             [](const Lane& lane) { return lane.signals.empty(); }),
 		              m_lanes.end());
 
-		SyncLanes(dataSet);
+		SyncLanes();
 	}
 
 	void TabConfig::RemapAfterFileRemoval(int fileIndex)
@@ -1147,7 +1126,7 @@ namespace jdi
 		return fileVisible[static_cast<std::size_t>(ref.signalIndex)];
 	}
 
-	void TabConfig::SetVisible(const DataSet& dataSet, const SignalRef& ref, bool visible)
+	void TabConfig::SetVisible(const SignalRef& ref, bool visible)
 	{
 		if (ref.fileIndex < 0 || static_cast<std::size_t>(ref.fileIndex) >= m_visible.size())
 		{
@@ -1171,15 +1150,15 @@ namespace jdi
 			m_laneMode = LaneMode::CUSTOM;
 		}
 
-		SyncLanes(dataSet);
+		SyncLanes();
 	}
 
-	void TabConfig::ToggleVisible(const DataSet& dataSet, const SignalRef& ref)
+	void TabConfig::ToggleVisible(const SignalRef& ref)
 	{
-		SetVisible(dataSet, ref, !IsVisible(ref));
+		SetVisible(ref, !IsVisible(ref));
 	}
 
-	void TabConfig::SetFileVisible(const DataSet& dataSet, int fileIndex, bool visible)
+	void TabConfig::SetFileVisible(int fileIndex, bool visible)
 	{
 		if (fileIndex < 0 || static_cast<std::size_t>(fileIndex) >= m_visible.size())
 		{
@@ -1187,30 +1166,29 @@ namespace jdi
 		}
 		std::vector<bool>& fileVisible = m_visible[static_cast<std::size_t>(fileIndex)];
 		std::fill(fileVisible.begin(), fileVisible.end(), visible);
-		SyncLanes(dataSet);
+		SyncLanes();
 	}
 
-	void TabConfig::SetAllVisible(const DataSet& dataSet, bool visible)
+	void TabConfig::SetAllVisible(bool visible)
 	{
 		for (std::vector<bool>& fileVisible : m_visible)
 		{
 			std::fill(fileVisible.begin(), fileVisible.end(), visible);
 		}
-		SyncLanes(dataSet);
+		SyncLanes();
 	}
 
-	void TabConfig::SoloSignal(const DataSet& dataSet, const SignalRef& ref)
+	void TabConfig::SoloSignal(const SignalRef& ref)
 	{
 		for (std::vector<bool>& fileVisible : m_visible)
 		{
 			std::fill(fileVisible.begin(), fileVisible.end(), false);
 		}
-		SetVisible(dataSet, ref, true);
+		SetVisible(ref, true);
 	}
 
-	bool TabConfig::FileHasVisible(const DataSet& dataSet, int fileIndex) const
+	bool TabConfig::FileHasVisible(int fileIndex) const
 	{
-		(void)dataSet;
 		if (fileIndex < 0 || static_cast<std::size_t>(fileIndex) >= m_visible.size())
 		{
 			return false;
@@ -1219,9 +1197,8 @@ namespace jdi
 		return std::find(fileVisible.begin(), fileVisible.end(), true) != fileVisible.end();
 	}
 
-	bool TabConfig::FileAllVisible(const DataSet& dataSet, int fileIndex) const
+	bool TabConfig::FileAllVisible(int fileIndex) const
 	{
-		(void)dataSet;
 		if (fileIndex < 0 || static_cast<std::size_t>(fileIndex) >= m_visible.size())
 		{
 			return false;
@@ -1256,15 +1233,14 @@ namespace jdi
 		return count;
 	}
 
-	void TabConfig::SetMode(const DataSet& dataSet, LaneMode mode)
+	void TabConfig::SetMode(LaneMode mode)
 	{
 		m_laneMode = mode;
-		SyncLanes(dataSet);
+		SyncLanes();
 	}
 
-	void TabConfig::SyncLanes(const DataSet& dataSet)
+	void TabConfig::SyncLanes()
 	{
-		(void)dataSet;
 		RebuildLanes(m_visible, m_lanes, m_laneMode);
 	}
 

Utilities/Src/PaintUtil.cpp

@@ -249,16 +249,6 @@ namespace jdi
 		g.ReleaseHDC(hdc);
 	}
 
-	float UiTextWidth(gd::Graphics& g, const std::wstring& text, HFONT font)
-	{
-		// 直接复用 UiMeasureTextWidth：后者用 GetDC(nullptr) 取度量 HDC，
-		// 不会触发 **Graphics::GetHDC() 的 GDI+ 批次刷新**（实测每次约 5µs）。
-		// UiEllipsize 会反复调用本函数（逐字符回退时每步一次），
-		// 若走 GetHDC 路线，一个长名称就要刷新十几次，是拖拽掉帧的隐性来源之一。
-		(void)g;
-		return UiMeasureTextWidth(font, text);
-	}
-
 	float UiMeasureTextWidth(HFONT font, const std::wstring& text)
 	{
 		if (text.empty() || font == nullptr)
@@ -281,19 +271,19 @@ namespace jdi
 		return static_cast<float>(size.cx);
 	}
 
-	std::wstring UiEllipsize(gd::Graphics& g, const std::wstring& text, HFONT font, float maxWidth)
+	std::wstring UiEllipsize(const std::wstring& text, HFONT font, float maxWidth)
 	{
 		if (text.empty() || font == nullptr || maxWidth <= 0.0f)
 		{
 			return std::wstring();
 		}
-		if (UiTextWidth(g, text, font) <= maxWidth)
+		if (UiMeasureTextWidth(font, text) <= maxWidth)
 		{
 			return text;
 		}
 
 		const std::wstring ellipsis = L"…";
-		const float ellipsisWidth = UiTextWidth(g, ellipsis, font);
+		const float ellipsisWidth = UiMeasureTextWidth(font, ellipsis);
 		if (ellipsisWidth > maxWidth)
 		{
 			return std::wstring();
@@ -303,7 +293,7 @@ namespace jdi
 		while (!result.empty())
 		{
 			result.pop_back();
-			if (UiTextWidth(g, result, font) + ellipsisWidth <= maxWidth)
+			if (UiMeasureTextWidth(font, result) + ellipsisWidth <= maxWidth)
 			{
 				return result + ellipsis;
 			}

Utilities/Src/PopupMenu.cpp

@@ -318,15 +318,6 @@ namespace jdi
 		                 rect.Y + (rect.Height - height) * 0.5f, width, height);
 	}
 
-	int PopupMenu::EditingItemId() const
-	{
-		if (m_editIndex < 0 || m_editIndex >= static_cast<int>(m_items.size()))
-		{
-			return 0;
-		}
-		return m_items[static_cast<std::size_t>(m_editIndex)].id;
-	}
-
 	bool PopupMenu::IsOnEditField(int x, int y) const
 	{
 		if (m_editIndex < 0)
@@ -1050,7 +1041,7 @@ namespace jdi
 				const float labelLeft = rect.X + kItemPad * m_scale;
 				const gd::RectF fieldRect = EditFieldRect(static_cast<int>(index));
 				const float labelWidth = std::max(8.0f, fieldRect.X - labelLeft - kEditFieldGap * m_scale);
-				UiText(g, UiEllipsize(g, item.label, m_fonts->uiSmall, labelWidth), m_fonts->uiSmall,
+				UiText(g, UiEllipsize(item.label, m_fonts->uiSmall, labelWidth), m_fonts->uiSmall,
 				       gd::RectF(labelLeft, rect.Y, labelWidth, rect.Height), labelColor, TextAlign::LEFT);
 
 				if (static_cast<int>(index) == m_editIndex)
@@ -1062,7 +1053,7 @@ namespace jdi
 					UiFillRoundRect(g, fieldRect, 3.0f * m_scale, m_theme->pressed);
 					UiDrawRoundRect(g, fieldRect, 3.0f * m_scale, m_theme->border, 1.0f);
 					const std::wstring text =
-					    UiEllipsize(g, item.value, m_fonts->uiSmall, fieldRect.Width - 12.0f * m_scale);
+					    UiEllipsize(item.value, m_fonts->uiSmall, fieldRect.Width - 12.0f * m_scale);
 					UiText(g, text, m_fonts->uiSmall,
 					       gd::RectF(fieldRect.X + 6.0f * m_scale, fieldRect.Y,
 					                 std::max(8.0f, fieldRect.Width - 12.0f * m_scale), fieldRect.Height),
@@ -1146,7 +1137,7 @@ namespace jdi
 			const float textLeft = rect.X + kItemPad * m_scale;
 			const float textWidth =
 			    rect.Width - 2.0f * kItemPad * m_scale - kMarkerColumn * m_scale - kMarkerGap * m_scale;
-			UiText(g, UiEllipsize(g, item.label, m_fonts->uiSmall, textWidth), m_fonts->uiSmall,
+			UiText(g, UiEllipsize(item.label, m_fonts->uiSmall, textWidth), m_fonts->uiSmall,
 			       gd::RectF(textLeft, rect.Y, std::max(8.0f, textWidth), rect.Height), textColor,
 			       TextAlign::LEFT);
 		}
@@ -1206,12 +1197,12 @@ namespace jdi
 				const float labelLeft = rect.X + kItemPad * m_scale;
 				const gd::RectF fieldRect = EditFieldRect(static_cast<int>(index));
 				const float labelWidth = std::max(8.0f, fieldRect.X - labelLeft - kEditFieldGap * m_scale);
-				UiText(g, UiEllipsize(g, item.label, m_fonts->uiSmall, labelWidth), m_fonts->uiSmall,
+				UiText(g, UiEllipsize(item.label, m_fonts->uiSmall, labelWidth), m_fonts->uiSmall,
 				       gd::RectF(labelLeft, rect.Y, labelWidth, rect.Height), labelColor, TextAlign::LEFT);
 				UiFillRoundRect(g, fieldRect, 3.0f * m_scale, m_theme->pressed);
 				UiDrawRoundRect(g, fieldRect, 3.0f * m_scale, m_theme->border, 1.0f);
 				const std::wstring text =
-				    UiEllipsize(g, item.value, m_fonts->uiSmall, fieldRect.Width - 12.0f * m_scale);
+				    UiEllipsize(item.value, m_fonts->uiSmall, fieldRect.Width - 12.0f * m_scale);
 				UiText(g, text, m_fonts->uiSmall,
 				       gd::RectF(fieldRect.X + 6.0f * m_scale, fieldRect.Y,
 				                 std::max(8.0f, fieldRect.Width - 12.0f * m_scale), fieldRect.Height),
@@ -1258,7 +1249,7 @@ namespace jdi
 			const float textLeft = rect.X + kItemPad * m_scale;
 			const float textWidth =
 			    rect.Width - 2.0f * kItemPad * m_scale - kMarkerColumn * m_scale - kMarkerGap * m_scale;
-			UiText(g, UiEllipsize(g, item.label, m_fonts->uiSmall, textWidth), m_fonts->uiSmall,
+			UiText(g, UiEllipsize(item.label, m_fonts->uiSmall, textWidth), m_fonts->uiSmall,
 			       gd::RectF(textLeft, rect.Y, std::max(8.0f, textWidth), rect.Height), textColor,
 			       TextAlign::LEFT);
 		}

Utilities/Src/TextEdit.cpp

@@ -322,21 +322,6 @@ namespace jdi
 		return changed;
 	}
 
-	bool TextEdit::PlaceCaret(std::size_t offset)
-	{
-		if (!m_active)
-		{
-			return false;
-		}
-
-		const std::size_t target = ClampOffset(offset);
-		const bool changed = HasSelection() || (m_caret != target);
-		m_caret = target;
-		m_anchor = target;
-		m_fresh = false;
-		return changed;
-	}
-
 	void TextEdit::BeginDrag(std::size_t offset)
 	{
 		if (!m_active)

Utilities/Src/Theme.cpp

@@ -80,9 +80,4 @@ namespace jdi
 		return kSignalPalette;
 	}
 
-	int SignalColorCount()
-	{
-		return static_cast<int>(sizeof(kSignalPalette) / sizeof(kSignalPalette[0]));
-	}
-
 } // namespace jdi

Utilities/Src/Utf8Util.cpp

@@ -50,30 +50,6 @@ namespace jdi
 		return result;
 	}
 
-	std::string WideToUtf8(const wchar_t* text)
-	{
-		if (text == nullptr)
-		{
-			return std::string();
-		}
-
-		int wideCount = static_cast<int>(std::wcslen(text));
-		if (wideCount <= 0)
-		{
-			return std::string();
-		}
-
-		int byteCount = WideCharToMultiByte(CP_UTF8, 0, text, wideCount, nullptr, 0, nullptr, nullptr);
-		if (byteCount <= 0)
-		{
-			return std::string();
-		}
-
-		std::string result(static_cast<size_t>(byteCount), '\0');
-		WideCharToMultiByte(CP_UTF8, 0, text, wideCount, &result[0], byteCount, nullptr, nullptr);
-		return result;
-	}
-
 	std::wstring Trim(const std::wstring& text)
 	{
 		size_t begin = 0;
@@ -117,15 +93,6 @@ namespace jdi
 		return result;
 	}
 
-	bool StartsWith(const std::wstring& text, const std::wstring& prefix)
-	{
-		if (prefix.size() > text.size())
-		{
-			return false;
-		}
-		return text.compare(0, prefix.size(), prefix) == 0;
-	}
-
 	bool ContainsInsensitive(const std::wstring& text, const std::wstring& needle)
 	{
 		if (needle.empty())