#include "SignalPanel.hpp"

#include <algorithm>
#include <cmath>
#include <cstdlib>

#include "Utf8Util.hpp"

namespace jdi
{

	namespace
	{
		const float kHeaderHeight = 38.0f;		/**< 标题区高度（逻辑像素）。 */
		const float kFileRowHeight = 30.0f;		/**< 文件分组行高。 */
		const float kSignalRowHeight = 27.0f;	/**< 信号行高。 */
		const float kPadding = 12.0f;			/**< 通用内边距。 */
		const float kCheckSize = 15.0f;			/**< 复选框尺寸。 */
		const float kSwatchSize = 12.0f;		/**< 信号行颜色小方块尺寸。 */
		const float kBadgeWidth = 30.0f;		/**< 网格徽标宽度。 */
		const float kBadgeHeight = 17.0f;		/**< 网格徽标高度。 */
		const float kCorner = 4.0f;				/**< 通用圆角半径。 */
		const float kDisclosureWidth = 16.0f;	/**< 折叠三角占位宽度。 */
		const float kIndent = 14.0f;			/**< 信号行相对文件行的缩进。 */
		const float kScrollBarThickness = 8.0f;	/**< 滚动条宽度。 */
		const float kCloseButtonSize = 18.0f;	/**< 文件行关闭按钮尺寸。 */

		// 样式编辑区：固定四行网格，行高与间距恒定，保证面板宽度变化时控件不散架。
		const float kStylePadH = 12.0f;			/**< 样式区左右内边距。 */
		const float kStylePadV = 12.0f;			/**< 样式区上下内边距。 */
		const float kStyleRowHeight = 26.0f;	/**< 样式区单行高度。 */
		const float kStyleRowGap = 10.0f;		/**< 样式区行间距。 */
		const float kStyleLabelWidth = 44.0f;	/**< 样式行标签列宽度。 */
		const float kStyleRowCount = 4.0f;		/**< 样式区固定行数。 */
		const float kSwatchEdge = 18.0f;		/**< 颜色色块边长（含自定义颜色入口）。 */
		const float kSwatchGap = 5.0f;			/**< 颜色色块间距。 */
		const float kWidthPresetWidth = 46.0f;	/**< 线宽预设按钮宽度。 */
		const float kWidthSpinButton = 22.0f;	/**< 线宽旋钮按钮宽度。 */
		const float kWidthValueWidth = 62.0f;	/**< 线宽数值框宽度。 */
		const float kOpacityValueWidth = 52.0f;	/**< 不透明度数值宽度。 */
		const float kTrackHeight = 6.0f;		/**< 滑块轨道高度。 */

		const float kWidthMin = 0.5f;			/**< 允许的最小线宽。 */
		const float kWidthMax = 6.0f;			/**< 允许的最大线宽。 */
		const float kWidthStep = 0.2f;			/**< 线宽增减步进。 */
		const float kWidthThinPreset = 1.0f;	/**< 最细线宽预设值。 */
		const float kWidthThickPreset = 3.0f;	/**< 最粗线宽预设值。 */

		/** @brief 可选绘制样式顺序（不含阶梯方式）。 */
		const DrawMode kModeOptions[] = {DrawMode::LINE, DrawMode::SCATTER, DrawMode::LINE_SCATTER};
		const int kModeOptionCount = static_cast<int>(sizeof(kModeOptions) / sizeof(kModeOptions[0]));

		/**
		 * @brief 计算滑块的便捷命中矩形（比轨道略大，便于拖拽）。
		 * @param [IN] track 轨道矩形。
		 * @param [IN] scale 缩放比例。
		 * @return 命中矩形。
		 */
		gd::RectF SliderHitRect(const gd::RectF& track, float scale)
		{
			return gd::RectF(track.X - 6.0f * scale, track.Y - 9.0f * scale, track.Width + 12.0f * scale,
			                 track.Height + 18.0f * scale);
		}

		/**
		 * @brief 绘制水平滑块（轨道 + 已填充部分 + 圆钮）。
		 * @param [IN,OUT] g 绘图上下文。
		 * @param [IN] track 轨道矩形。
		 * @param [IN] ratio 当前值比例（0-1）。
		 * @param [IN] fillColor 已填充部分颜色。
		 * @param [IN] active 是否处于悬停或拖拽状态。
		 * @param [IN] scale 缩放比例。
		 */
		void DrawSlider(gd::Graphics& g, const gd::RectF& track, double ratio, std::uint32_t fillColor,
		                bool active, float scale)
		{
			const float radius = track.Height * 0.5f;
			UiFillRoundRect(g, track, radius, 0x2A657B83u);

			ratio = std::max(0.0, std::min(1.0, ratio));
			const float fillWidth = std::max(track.Height, static_cast<float>(ratio) * track.Width);
			UiFillRoundRect(g, gd::RectF(track.X, track.Y, fillWidth, track.Height), radius, fillColor);

			const float knobX = track.X + static_cast<float>(ratio) * track.Width;
			const float knobRadius = radius + (active ? 2.5f * scale : 0.8f * scale);

			gd::SolidBrush knob(ToGdiColor(0xFFFFFFFFu));
			gd::Pen knobPen(ToGdiColor(0xFF586E75u), 1.4f * scale);
			g.FillEllipse(&knob, knobX - knobRadius, track.Y + radius - knobRadius, knobRadius * 2.0f,
			              knobRadius * 2.0f);
			g.DrawEllipse(&knobPen, knobX - knobRadius, track.Y + radius - knobRadius, knobRadius * 2.0f,
			              knobRadius * 2.0f);
		}

		/**
		 * @brief 将颜色按不透明度叠加为实际显示颜色。
		 * @param [IN] color 0xAARRGGBB 颜色值。
		 * @param [IN] opacity 不透明度（0-1）。
		 * @return 叠加后的颜色值。
		 */
		std::uint32_t ApplyOpacity(std::uint32_t color, float opacity)
		{
			double alpha = static_cast<double>(opacity);
			alpha = std::max(0.0, std::min(1.0, alpha));
			return WithAlpha(color, static_cast<unsigned int>(alpha * 255.0 + 0.5));
		}

		/**
		 * @brief 将数值限制到合法区间。
		 * @param [IN] value 输入值。
		 * @param [IN] low 下限。
		 * @param [IN] high 上限。
		 * @return 限制后的数值。
		 */
		float ClampFloat(float value, float low, float high)
		{
			return (value < low) ? low : ((value > high) ? high : value);
		}
	}

	SignalPanel::SignalPanel()
	{
		m_colorRects.fill(gd::RectF());
		m_modeRects.fill(gd::RectF());
	}

	void SignalPanel::Setup(HWND host, const UiFonts* fonts, const Theme* theme, PopupMenu* menu,
	                        ColorPickerPopup* colorPicker)
	{
		m_host = host;
		m_fonts = fonts;
		m_theme = theme;
		m_menu = menu;
		m_colorPicker = colorPicker;
	}

	void SignalPanel::SetContext(const DataSet* dataSet, TabConfig* tab)
	{
		m_dataSet = dataSet;
		m_tab = tab;
		m_rowsDirty = true;
		m_scrollOffset = 0.0f;
		m_draggingOpacity = false;
		m_widthEditing = false;
		m_widthEditText.clear();
		m_pendingLaneMenu = false;
		m_pendingColorPicker = false;
	}

	void SignalPanel::SetScale(float scale)
	{
		m_scale = (scale > 0.1f) ? scale : 1.0f;
	}

	bool SignalPanel::HitTest(int x, int y) const
	{
		return UiPointInRect(m_area, static_cast<float>(x), static_cast<float>(y));
	}

	int SignalPanel::TotalSignalCount() const
	{
		if (m_dataSet == nullptr)
		{
			return 0;
		}
		return static_cast<int>(m_dataSet->SignalCount());
	}

	float SignalPanel::DesiredStyleHeight() const
	{
		return kStylePadV * 2.0f + kStyleRowCount * kStyleRowHeight +
		       (kStyleRowCount - 1.0f) * kStyleRowGap;
	}

	bool SignalPanel::TakeLayoutDirty()
	{
		const bool dirty = m_layoutDirty;
		m_layoutDirty = false;
		return dirty;
	}

	void SignalPanel::BuildRows()
	{
		m_rows.clear();
		m_rowsDirty = false;

		if (m_dataSet == nullptr || m_tab == nullptr)
		{
			m_contentHeight = 0.0f;
			return;
		}

		const float fileHeight = kFileRowHeight * m_scale;
		const float signalHeight = kSignalRowHeight * m_scale;

		const std::vector<DataFile>& files = m_dataSet->Files();
		for (std::size_t fileIndex = 0; fileIndex < files.size(); ++fileIndex)
		{
			ListRow fileRow;
			fileRow.kind = RowKind::FILE;
			fileRow.fileIndex = static_cast<int>(fileIndex);
			fileRow.height = fileHeight;
			m_rows.push_back(fileRow);

			if (m_tab->IsCollapsed(static_cast<int>(fileIndex)))
			{
				continue;
			}

			const std::size_t signalCount = files[fileIndex].signals.size();
			for (std::size_t signalIndex = 0; signalIndex < signalCount; ++signalIndex)
			{
				ListRow signalRow;
				signalRow.kind = RowKind::SIGNAL;
				signalRow.fileIndex = static_cast<int>(fileIndex);
				signalRow.signalIndex = static_cast<int>(signalIndex);
				signalRow.height = signalHeight;
				m_rows.push_back(signalRow);
			}
		}

		m_contentHeight = 0.0f;
		for (const ListRow& row : m_rows)
		{
			m_contentHeight += row.height;
		}
	}

	void SignalPanel::EnsureRows()
	{
		if (m_rowsDirty)
		{
			BuildRows();
			RefreshScrollBar();
		}
	}

	void SignalPanel::RefreshScrollBar()
	{
		if (m_listFullWidth <= 0.0f)
		{
			m_scrollBarVisible = false;
			return;
		}

		m_scrollBarVisible = (m_contentHeight > m_listRect.Height + 0.5f);
		if (m_scrollBarVisible)
		{
			const float thickness = kScrollBarThickness * m_scale;
			m_listRect.Width = std::max(0.0f, m_listFullWidth - thickness - 2.0f * m_scale);
			m_scrollBarRect = gd::RectF(m_area.X + m_area.Width - thickness - 3.0f * m_scale, m_listRect.Y,
			                            thickness, m_listRect.Height);
		}
		else
		{
			m_listRect.Width = m_listFullWidth;
			m_scrollBarRect = gd::RectF();
		}

		ClampScroll();
	}

	float SignalPanel::ContentHeight() const
	{
		return m_contentHeight;
	}

	void SignalPanel::ClampScroll()
	{
		const float maxOffset = std::max(0.0f, m_contentHeight - m_listRect.Height);
		m_scrollOffset = std::max(0.0f, std::min(m_scrollOffset, maxOffset));
	}

	gd::RectF SignalPanel::RowRect(int row) const
	{
		if (row < 0 || row >= static_cast<int>(m_rows.size()))
		{
			return gd::RectF();
		}

		float top = m_listRect.Y - m_scrollOffset;
		for (int index = 0; index < row; ++index)
		{
			top += m_rows[static_cast<std::size_t>(index)].height;
		}
		return gd::RectF(m_listRect.X, top, m_listRect.Width, m_rows[static_cast<std::size_t>(row)].height);
	}

	gd::RectF SignalPanel::FileCloseRect(int row) const
	{
		const gd::RectF rect = RowRect(row);
		const float size = kCloseButtonSize * m_scale;
		return gd::RectF(rect.X + rect.Width - kPadding * m_scale - size,
		                 rect.Y + (rect.Height - size) * 0.5f, size, size);
	}

	gd::RectF SignalPanel::SignalBadgeRect(int row) const
	{
		const gd::RectF rect = RowRect(row);
		const float width = kBadgeWidth * m_scale;
		const float height = kBadgeHeight * m_scale;
		return gd::RectF(rect.X + rect.Width - kPadding * m_scale - width,
		                 rect.Y + (rect.Height - height) * 0.5f, width, height);
	}

	int SignalPanel::HitRow(int x, int y, RowPart& part)
	{
		part = RowPart::NONE;
		EnsureRows();

		if (m_listRect.Height <= 0.0f)
		{
			return -1;
		}

		const float fx = static_cast<float>(x);
		const float fy = static_cast<float>(y);
		if (fy < m_listRect.Y || fy > m_listRect.Y + m_listRect.Height)
		{
			return -1;
		}
		if (fx < m_listRect.X || fx > m_listRect.X + m_listRect.Width)
		{
			return -1;
		}

		const float local = fy - m_listRect.Y + m_scrollOffset;
		if (local < 0.0f)
		{
			return -1;
		}

		float accumulated = 0.0f;
		for (std::size_t index = 0; index < m_rows.size(); ++index)
		{
			const ListRow& row = m_rows[index];
			if (local >= accumulated && local < accumulated + row.height)
			{
				const int rowIndex = static_cast<int>(index);
				const gd::RectF rect = RowRect(rowIndex);
				const bool isFile = (row.kind == RowKind::FILE);
				const float baseX = rect.X + kPadding * m_scale + (isFile ? 0.0f : kIndent * m_scale);

				const gd::RectF disclosureRect(baseX, rect.Y, kDisclosureWidth * m_scale, rect.Height);
				const gd::RectF checkRect(baseX + kDisclosureWidth * m_scale,
				                          rect.Y + (rect.Height - kCheckSize * m_scale) * 0.5f,
				                          kCheckSize * m_scale, kCheckSize * m_scale);

				if (isFile)
				{
					if (UiPointInRect(disclosureRect, fx, fy))
					{
						part = RowPart::DISCLOSURE;
					}
					else if (UiPointInRect(checkRect, fx, fy))
					{
						part = RowPart::CHECK;
					}
					else if (UiPointInRect(FileCloseRect(rowIndex), fx, fy))
					{
						part = RowPart::CLOSE;
					}
					else
					{
						part = RowPart::BODY;
					}
				}
				else
				{
					const SignalRef ref{row.fileIndex, row.signalIndex};
					const bool badgeVisible = (m_tab != nullptr) && m_tab->IsVisible(ref);

					if (UiPointInRect(checkRect, fx, fy))
					{
						part = RowPart::CHECK;
					}
					else if (badgeVisible && UiPointInRect(SignalBadgeRect(rowIndex), fx, fy))
					{
						part = RowPart::LANE_BADGE;
					}
					else
					{
						part = RowPart::BODY;
					}
				}
				return rowIndex;
			}
			accumulated += row.height;
		}
		return -1;
	}

	void SignalPanel::ScrollToSignal(const SignalRef& ref)
	{
		EnsureRows();
		if (!ref.IsValid())
		{
			return;
		}

		float top = 0.0f;
		for (std::size_t index = 0; index < m_rows.size(); ++index)
		{
			const ListRow& row = m_rows[index];
			if (row.kind == RowKind::SIGNAL && row.fileIndex == ref.fileIndex &&
			    row.signalIndex == ref.signalIndex)
			{
				if (top < m_scrollOffset)
				{
					m_scrollOffset = top;
				}
				else if (top + row.height > m_scrollOffset + m_listRect.Height)
				{
					m_scrollOffset = top + row.height - m_listRect.Height;
				}
				ClampScroll();
				return;
			}
			top += row.height;
		}
	}

	void SignalPanel::LayoutStyleControls()
	{
		const float labelWidth = kStyleLabelWidth * m_scale;
		const float contentLeft = m_styleRect.X + kStylePadH * m_scale + labelWidth;
		const float contentWidth = std::max(60.0f, m_styleRect.Width - kStylePadH * 2.0f * m_scale - labelWidth);

		const float rowHeight = kStyleRowHeight * m_scale;
		const float row0Top = m_styleRect.Y + kStylePadV * m_scale;

		// ---- 第一行：颜色（预设色块 + 同尺寸自定义颜色入口）----
		int paletteCount = 0;
		SignalPalette(paletteCount);

		float swatchSize = kSwatchEdge * m_scale;
		const float swatchGap = kSwatchGap * m_scale;
		int count = std::min(paletteCount, static_cast<int>(m_colorRects.size()));

		// 为自定义颜色入口预留一个同尺寸格位，优先整体缩小色块以保留全部预设颜色。
		if (count > 0)
		{
			const float fit = (contentWidth - swatchGap * static_cast<float>(count)) /
			                  static_cast<float>(count + 1);
			if (fit < swatchSize)
			{
				swatchSize = fit;
			}
			// 色块小于可用下限时再从末尾裁剪预设，避免尺寸不可用。
			const float minSwatch = 14.0f * m_scale;
			while (count > 1 && swatchSize < minSwatch)
			{
				--count;
				swatchSize = (contentWidth - swatchGap * static_cast<float>(count)) /
				             static_cast<float>(count + 1);
			}
		}
		m_colorCount = std::max(0, count);
		m_swatchSize = swatchSize / m_scale;

		const float swatchTop = row0Top + (rowHeight - swatchSize) * 0.5f;
		for (int index = 0; index < m_colorCount; ++index)
		{
			const float x = contentLeft + static_cast<float>(index) * (swatchSize + swatchGap);
			m_colorRects[static_cast<std::size_t>(index)] = gd::RectF(x, swatchTop, swatchSize, swatchSize);
		}
		m_customChipRect =
		    gd::RectF(contentLeft + static_cast<float>(m_colorCount) * (swatchSize + swatchGap), swatchTop,
		              swatchSize, swatchSize);

		// ---- 第二行：线宽（最细 / 数值旋钮 / 最粗）----
		const float presetWidth = kWidthPresetWidth * m_scale;
		const float spinButton = kWidthSpinButton * m_scale;
		const float valueWidth = kWidthValueWidth * m_scale;
		float groupGap = 8.0f * m_scale;

		float spinnerWidth = spinButton * 2.0f + valueWidth;
		float groupWidth = presetWidth * 2.0f + spinnerWidth + groupGap * 2.0f;
		if (groupWidth > contentWidth)
		{
			const float fit = contentWidth / groupWidth;
			groupGap = std::max(3.0f * m_scale, groupGap * fit);
			spinnerWidth = std::max(spinButton * 2.0f + 36.0f * m_scale, spinnerWidth * fit);
			groupWidth = std::min(contentWidth, presetWidth * 2.0f + spinnerWidth + groupGap * 2.0f);
		}

		const float row1Top = row0Top + (kStyleRowHeight + kStyleRowGap) * m_scale;
		const float groupLeft = contentLeft + std::max(0.0f, (contentWidth - groupWidth) * 0.5f);
		const float innerSpinButton = std::min(spinButton, spinnerWidth * 0.25f);
		const float innerValueWidth = std::max(24.0f * m_scale, spinnerWidth - innerSpinButton * 2.0f);

		m_widthThinRect = gd::RectF(groupLeft, row1Top, presetWidth, rowHeight);
		m_widthSpinnerRect = gd::RectF(groupLeft + presetWidth + groupGap, row1Top, spinnerWidth, rowHeight);
		m_widthMinusRect = gd::RectF(m_widthSpinnerRect.X, row1Top, innerSpinButton, rowHeight);
		m_widthValueRect = gd::RectF(m_widthMinusRect.X + innerSpinButton, row1Top, innerValueWidth, rowHeight);
		m_widthPlusRect = gd::RectF(m_widthValueRect.X + innerValueWidth, row1Top, innerSpinButton, rowHeight);
		m_widthThickRect =
		    gd::RectF(m_widthSpinnerRect.X + spinnerWidth + groupGap, row1Top, presetWidth, rowHeight);

		// ---- 第三行：样式（线段 / 散点 / 点线）----
		const float row2Top = row1Top + (kStyleRowHeight + kStyleRowGap) * m_scale;
		const float modeGap = 6.0f * m_scale;
		const float modeWidth = (contentWidth - modeGap * static_cast<float>(kModeOptionCount - 1)) /
		                        static_cast<float>(kModeOptionCount);
		for (int index = 0; index < kModeOptionCount; ++index)
		{
			const float x = contentLeft + static_cast<float>(index) * (modeWidth + modeGap);
			m_modeRects[static_cast<std::size_t>(index)] = gd::RectF(x, row2Top, modeWidth, rowHeight);
		}

		// ---- 第四行：不透明度 ----
		const float row3Top = row2Top + (kStyleRowHeight + kStyleRowGap) * m_scale;
		const float opacityValueWidth = kOpacityValueWidth * m_scale;
		const float trackWidth = std::max(40.0f, contentWidth - opacityValueWidth - 8.0f * m_scale);
		m_opacityTrackRect = gd::RectF(contentLeft, row3Top + (rowHeight - kTrackHeight * m_scale) * 0.5f,
		                               trackWidth, kTrackHeight * m_scale);
		m_opacityValueRect = gd::RectF(contentLeft + trackWidth + 8.0f * m_scale, row3Top,
		                               opacityValueWidth - 8.0f * m_scale, rowHeight);
	}

	void SignalPanel::Layout(const gd::RectF& area)
	{
		m_area = area;

		m_headerRect = gd::RectF(area.X, area.Y, area.Width, kHeaderHeight * m_scale);

		const float styleHeight = DesiredStyleHeight() * m_scale;
		m_styleRect = gd::RectF(area.X, area.Y + area.Height - styleHeight, area.Width, styleHeight);
		m_listRect = gd::RectF(area.X, m_headerRect.Y + m_headerRect.Height, area.Width,
		                       std::max(0.0f, m_styleRect.Y - m_headerRect.Y - m_headerRect.Height));

		// 标题区右侧的“全部显示/隐藏”按钮。
		const float toggleWidth = 68.0f * m_scale;
		const float toggleHeight = 22.0f * m_scale;
		m_toggleAllRect = gd::RectF(area.X + area.Width - kPadding * m_scale - toggleWidth,
		                            m_headerRect.Y + (m_headerRect.Height - toggleHeight) * 0.5f,
		                            toggleWidth, toggleHeight);

		// 依据内容决定是否显示滚动条，并据此收缩列表可用宽度。
		m_listFullWidth = m_listRect.Width;
		EnsureRows();
		RefreshScrollBar();

		LayoutStyleControls();
	}

	void SignalPanel::Paint(gd::Graphics& g)
	{
		if (m_theme == nullptr || m_fonts == nullptr)
		{
			return;
		}

		EnsureRows();
		UiFillRect(g, m_area, m_theme->panelBg);

		// 标题区。
		{
			std::wstring title = L"信号";
			if (m_dataSet != nullptr && m_tab != nullptr)
			{
				title += L" · " + std::to_wstring(m_tab->VisibleCount()) + L"/" +
				         std::to_wstring(TotalSignalCount()) + L" 已选";
			}

			gd::RectF titleRect(m_headerRect.X + kPadding * m_scale, m_headerRect.Y,
			                    std::max(20.0f, m_headerRect.Width - kPadding * 2.0f * m_scale -
			                                        m_toggleAllRect.Width - 8.0f * m_scale),
			                    m_headerRect.Height);
			UiText(g, UiEllipsize(g, title, m_fonts->uiBold, titleRect.Width), m_fonts->uiBold, titleRect,
			       m_theme->textStrong, TextAlign::LEFT);

			const bool allVisible = AreAllSignalsVisible();
			const std::wstring toggleLabel = allVisible ? L"全部隐藏" : L"全部显示";
			const bool toggleHover = (m_hoverStyle == StyleHit::TOGGLE_ALL);
			if (toggleHover)
			{
				UiFillRoundRect(g, m_toggleAllRect, kCorner * m_scale, m_theme->hover);
			}
			UiDrawRoundRect(g, m_toggleAllRect, kCorner * m_scale, m_theme->border, 1.0f);
			const bool enabled = (m_dataSet != nullptr && !m_dataSet->Empty());
			UiText(g, toggleLabel, m_fonts->uiSmall, m_toggleAllRect,
			       enabled ? m_theme->text : m_theme->textMuted, TextAlign::CENTER);
		}

		// 列表区。
		{
			const int saveState = g.Save();
			g.SetClip(gd::RectF(m_listRect.X, m_listRect.Y, m_listRect.Width, m_listRect.Height));

			if (m_dataSet == nullptr || m_dataSet->Empty())
			{
				UiText(g, L"尚未加载数据，请打开 CSV 文件", m_fonts->uiSmall, m_listRect, m_theme->textMuted,
				       TextAlign::CENTER);
			}
			else
			{
				const int rowCount = static_cast<int>(m_rows.size());
				for (int row = 0; row < rowCount; ++row)
				{
					const gd::RectF rect = RowRect(row);
					if (rect.Y + rect.Height < m_listRect.Y || rect.Y > m_listRect.Y + m_listRect.Height)
					{
						continue;
					}
					if (m_rows[static_cast<std::size_t>(row)].kind == RowKind::FILE)
					{
						PaintFileRow(g, row);
					}
					else
					{
						PaintSignalRow(g, row);
					}
				}
			}

			g.Restore(saveState);
		}

		PaintScrollBar(g);
		PaintStyleSection(g);

		// 分隔线。
		UiDrawLine(g, m_area.X + m_area.Width - 1.0f, m_area.Y, m_area.X + m_area.Width - 1.0f,
		           m_area.Y + m_area.Height, m_theme->border, 1.0f);
		UiDrawLine(g, m_headerRect.X, m_headerRect.Y + m_headerRect.Height - 1.0f,
		           m_headerRect.X + m_headerRect.Width, m_headerRect.Y + m_headerRect.Height - 1.0f,
		           m_theme->border, 1.0f);
		if (m_styleRect.Height > 0.0f)
		{
			UiDrawLine(g, m_styleRect.X, m_styleRect.Y, m_styleRect.X + m_styleRect.Width, m_styleRect.Y,
			           m_theme->border, 1.0f);
		}
	}

	void SignalPanel::PaintFileRow(gd::Graphics& g, int row)
	{
		if (m_dataSet == nullptr || m_tab == nullptr || row < 0 || row >= static_cast<int>(m_rows.size()))
		{
			return;
		}

		const ListRow& item = m_rows[static_cast<std::size_t>(row)];
		const DataFile* file = m_dataSet->FileAt(item.fileIndex);
		if (file == nullptr)
		{
			return;
		}

		const gd::RectF rect = RowRect(row);
		const bool hovered = (m_hoverRow == row);
		if (hovered)
		{
			UiFillRect(g, rect, m_theme->hover);
		}
		UiFillRect(g, gd::RectF(rect.X, rect.Y, 2.0f * m_scale, rect.Height),
		           WithAlpha(m_theme->borderStrong, 0x90));

		const float baseX = rect.X + kPadding * m_scale;
		const float centerY = rect.Y + rect.Height * 0.5f;
		const bool collapsed = m_tab->IsCollapsed(item.fileIndex);

		// 折叠三角。
		{
			const float cx = baseX + kDisclosureWidth * m_scale * 0.5f;
			const std::uint32_t color =
			    (hovered && m_hoverPart == RowPart::DISCLOSURE) ? m_theme->accent : m_theme->text;
			UiDrawTriangleIcon(g, gd::RectF(cx - 6.0f * m_scale, centerY - 6.0f * m_scale, 12.0f * m_scale,
			                                12.0f * m_scale),
			                   color, collapsed ? IconDirection::RIGHT : IconDirection::DOWN);
		}

		// 分组复选框（三态：全选 / 部分 / 未选）。
		const gd::RectF checkRect(baseX + kDisclosureWidth * m_scale, centerY - kCheckSize * m_scale * 0.5f,
		                          kCheckSize * m_scale, kCheckSize * m_scale);
		const bool allVisible = m_tab->FileAllVisible(*m_dataSet, item.fileIndex);
		const bool anyVisible = m_tab->FileHasVisible(*m_dataSet, item.fileIndex);
		UiDrawCheckBox(g, checkRect, allVisible ? 1 : (anyVisible ? 2 : 0), 3.0f * m_scale);

		const gd::RectF closeRect = FileCloseRect(row);

		// 文件名称与统计。
		const float nameLeft = checkRect.X + checkRect.Width + 8.0f * m_scale;
		const std::wstring stats = std::to_wstring(file->signals.size()) + L" 项";
		const float statsWidth = UiMeasureTextWidth(m_fonts->uiSmall, stats);
		const float statsRight = closeRect.X - 6.0f * m_scale;
		const float nameWidth = std::max(20.0f, statsRight - statsWidth - 6.0f * m_scale - nameLeft);

		UiText(g, UiEllipsize(g, file->fileName, m_fonts->uiBold, nameWidth), m_fonts->uiBold,
		       gd::RectF(nameLeft, rect.Y, nameWidth, rect.Height), m_theme->textStrong, TextAlign::LEFT);
		UiText(g, stats, m_fonts->uiSmall, gd::RectF(statsRight - statsWidth, rect.Y, statsWidth, rect.Height),
		       m_theme->textMuted, TextAlign::RIGHT);

		// 关闭按钮（从工作区移除该文件）。
		const bool closeHot = hovered && (m_hoverPart == RowPart::CLOSE);
		if (closeHot)
		{
			UiFillRoundRect(g, closeRect, 3.0f * m_scale, m_theme->pressed);
		}
		UiDrawCrossIcon(g, closeRect, closeHot ? m_theme->danger : m_theme->textMuted, 1.5f * m_scale);
	}

	void SignalPanel::PaintSignalRow(gd::Graphics& g, int row)
	{
		if (m_dataSet == nullptr || m_tab == nullptr || row < 0 || row >= static_cast<int>(m_rows.size()))
		{
			return;
		}

		const ListRow& item = m_rows[static_cast<std::size_t>(row)];
		const SignalRef ref{item.fileIndex, item.signalIndex};
		const SignalData* signal = m_dataSet->Resolve(ref);
		const SignalStyle* style = m_tab->Style(ref);
		if (signal == nullptr || style == nullptr)
		{
			return;
		}

		const gd::RectF rect = RowRect(row);
		const bool selected = (m_tab->Selected() == ref);
		const bool hovered = (m_hoverRow == row);

		if (selected)
		{
			UiFillRect(g, rect, m_theme->selection);
			UiFillRect(g, gd::RectF(rect.X, rect.Y, 2.0f * m_scale, rect.Height), m_theme->accent);
		}
		else if (hovered)
		{
			UiFillRect(g, rect, m_theme->hover);
		}

		const float baseX = rect.X + kPadding * m_scale + kIndent * m_scale;
		const float centerY = rect.Y + rect.Height * 0.5f;

		// 复选框。
		const gd::RectF checkRect(baseX + kDisclosureWidth * m_scale, centerY - kCheckSize * m_scale * 0.5f,
		                          kCheckSize * m_scale, kCheckSize * m_scale);
		UiDrawCheckBox(g, checkRect, style->visible ? 1 : 0, 3.0f * m_scale);

		// 颜色块（叠加不透明度，直观反映显示效果）。
		const std::uint32_t swatchColor = ApplyOpacity(style->color, style->opacity);
		const gd::RectF swatchRect(checkRect.X + checkRect.Width + 6.0f * m_scale,
		                           centerY - kSwatchSize * m_scale * 0.5f, kSwatchSize * m_scale,
		                           kSwatchSize * m_scale);
		UiFillRoundRect(g, swatchRect, 2.5f * m_scale,
		                style->visible ? swatchColor : WithAlpha(style->color, 0x50));

		// 网格徽标（可点击，用于调整所属网格）。
		const int laneIndex = m_tab->LaneOfSignal(ref);
		const bool badgeVisible = (laneIndex >= 0) && style->visible;
		const gd::RectF badgeRect = SignalBadgeRect(row);

		float nameRightLimit = rect.X + rect.Width - kPadding * m_scale;
		if (badgeVisible)
		{
			nameRightLimit = badgeRect.X - 6.0f * m_scale;
		}

		// 名称：完全保留文件内的列名（含 "[n]" 序号与括号描述）。
		const float nameLeft = swatchRect.X + swatchRect.Width + 6.0f * m_scale;
		const float nameWidth = std::max(16.0f, nameRightLimit - nameLeft);
		const std::uint32_t nameColor = style->visible ? m_theme->text : m_theme->textMuted;
		UiText(g, UiEllipsize(g, signal->name, m_fonts->ui, nameWidth), m_fonts->ui,
		       gd::RectF(nameLeft, rect.Y, nameWidth, rect.Height), nameColor, TextAlign::LEFT);

		if (badgeVisible)
		{
			const bool badgeHot = hovered && (m_hoverPart == RowPart::LANE_BADGE);
			UiFillRoundRect(g, badgeRect, kBadgeHeight * m_scale * 0.5f,
			                badgeHot ? m_theme->accentSoft : m_theme->cardBg);
			UiDrawRoundRect(g, badgeRect, kBadgeHeight * m_scale * 0.5f,
			                badgeHot ? m_theme->accent : m_theme->border, 1.0f);
			UiText(g, L"G" + std::to_wstring(laneIndex + 1), m_fonts->monoSmall, badgeRect,
			       badgeHot ? m_theme->textStrong : m_theme->text, TextAlign::CENTER);
		}
	}

	gd::RectF SignalPanel::ScrollThumbRect() const
	{
		if (!m_scrollBarVisible || m_contentHeight <= m_listRect.Height || m_listRect.Height <= 0.0f)
		{
			return gd::RectF();
		}

		const float ratio = std::min(1.0f, m_listRect.Height / m_contentHeight);
		const float thumbHeight = std::max(24.0f * m_scale, m_scrollBarRect.Height * ratio);
		const float maxScroll = m_contentHeight - m_listRect.Height;
		const float progress = (maxScroll > 0.0f) ? (m_scrollOffset / maxScroll) : 0.0f;
		const float thumbY = m_scrollBarRect.Y + progress * (m_scrollBarRect.Height - thumbHeight);

		return gd::RectF(m_scrollBarRect.X, thumbY, m_scrollBarRect.Width, thumbHeight);
	}

	void SignalPanel::PaintScrollBar(gd::Graphics& g)
	{
		if (!m_scrollBarVisible || m_contentHeight <= m_listRect.Height)
		{
			return;
		}

		UiFillRoundRect(g, m_scrollBarRect, kScrollBarThickness * m_scale * 0.5f, m_theme->gridWeak);
		UiFillRoundRect(g, ScrollThumbRect(), kScrollBarThickness * m_scale * 0.5f, m_theme->borderStrong);
	}

	void SignalPanel::PaintStyleSection(gd::Graphics& g)
	{
		if (m_styleRect.Height <= 0.0f)
		{
			return;
		}

		UiFillRect(g, m_styleRect, m_theme->panelBg);

		const SignalStyle* style = (m_tab == nullptr) ? nullptr : m_tab->Style(m_tab->Selected());
		if (style == nullptr || m_tab->Selected().IsValid() == false)
		{
			UiText(g, L"请选择信号以编辑样式", m_fonts->uiSmall, m_styleRect, m_theme->textMuted,
			       TextAlign::CENTER);
			return;
		}

		const float labelX = m_styleRect.X + kStylePadH * m_scale;
		const float labelWidth = kStyleLabelWidth * m_scale;
		const float rowHeight = kStyleRowHeight * m_scale;

		// ---- 第一行：颜色 ----
		{
			UiText(g, L"颜色", m_fonts->uiSmall, gd::RectF(labelX, m_customChipRect.Y, labelWidth, rowHeight),
			       m_theme->textMuted, TextAlign::LEFT);

			int paletteCount = 0;
			const std::uint32_t* palette = SignalPalette(paletteCount);
			bool presetActive = false;
			for (int index = 0; index < m_colorCount; ++index)
			{
				const gd::RectF& rect = m_colorRects[static_cast<std::size_t>(index)];
				const std::uint32_t color = palette[index % paletteCount];
				const bool hovered = (m_hoverStyle == StyleHit::COLOR && m_hoverStyleIndex == index);
				const bool active = (style->color == color);
				presetActive = presetActive || active;

				UiFillRoundRect(g, rect, kCorner * m_scale, color);
				if (active || hovered)
				{
					const gd::RectF ring(rect.X - 2.0f * m_scale, rect.Y - 2.0f * m_scale,
					                     rect.Width + 4.0f * m_scale, rect.Height + 4.0f * m_scale);
					UiDrawRoundRect(g, ring, 5.0f * m_scale,
					                active ? m_theme->textStrong : m_theme->borderStrong,
					                active ? 1.6f : 1.0f);
				}
			}

			// 自定义颜色入口：与预设色块完全同尺寸、同外框样式的小方格，仅多一个加号图标。
			const bool chipHot = (m_hoverStyle == StyleHit::CUSTOM_CHIP);
			const bool chipActive = !presetActive && (m_colorPicker != nullptr) && m_colorPicker->IsOpen();
			UiFillRoundRect(g, m_customChipRect, kCorner * m_scale, m_theme->cardBg);
			UiDrawRoundRect(g, m_customChipRect, kCorner * m_scale, m_theme->borderStrong, 1.0f);
			UiDrawPlusIcon(g, m_customChipRect, chipHot ? m_theme->accent : m_theme->text,
			               1.6f * m_scale);

			// 当前颜色不在预设中时，用与预设一致的外框指示“正在使用自定义颜色”。
			if (!presetActive || chipHot)
			{
				const gd::RectF& chip = m_customChipRect;
				const gd::RectF ring(chip.X - 2.0f * m_scale, chip.Y - 2.0f * m_scale,
				                     chip.Width + 4.0f * m_scale, chip.Height + 4.0f * m_scale);
				UiDrawRoundRect(g, ring, 5.0f * m_scale,
				                !presetActive ? m_theme->textStrong : m_theme->borderStrong,
				                !presetActive ? 1.6f : 1.0f);
			}
			(void)chipActive;
		}

		// ---- 第二行：线宽 ----
		{
			UiText(g, L"线宽", m_fonts->uiSmall,
			       gd::RectF(labelX, m_widthThinRect.Y, labelWidth, rowHeight), m_theme->textMuted,
			       TextAlign::LEFT);

			const gd::RectF presetRects[2] = {m_widthThinRect, m_widthThickRect};
			const float presetWidths[2] = {kWidthThinPreset, kWidthThickPreset};
			for (int index = 0; index < 2; ++index)
			{
				const gd::RectF& rect = presetRects[index];
				const bool active = std::fabs(style->lineWidth - presetWidths[index]) < 0.01f;
				const bool hovered =
				    (m_hoverStyle == StyleHit::WIDTH_PRESET && m_hoverStyleIndex == index);

				UiFillRoundRect(g, rect, kCorner * m_scale,
				                active ? m_theme->accentSoft : (hovered ? m_theme->hover : m_theme->cardBg));
				UiDrawRoundRect(g, rect, kCorner * m_scale, active ? m_theme->accent : m_theme->border, 1.0f);

				const float centerY = rect.Y + rect.Height * 0.5f;
				UiDrawLine(g, rect.X + 9.0f * m_scale, centerY, rect.X + rect.Width - 9.0f * m_scale,
				           centerY, active ? m_theme->accent : m_theme->text,
				           presetWidths[index] * m_scale);
			}

			// 数值旋钮（线宽输入框）。
			const bool valueHot = (m_hoverStyle == StyleHit::WIDTH_VALUE);
			UiFillRoundRect(g, m_widthSpinnerRect, kCorner * m_scale, m_theme->cardBg);
			UiDrawRoundRect(g, m_widthSpinnerRect, kCorner * m_scale,
			                m_widthEditing ? m_theme->accent
			                               : (valueHot ? m_theme->borderStrong : m_theme->border),
			                m_widthEditing ? 1.6f : 1.0f);

			if (m_widthEditing)
			{
				const std::wstring editText =
				    m_widthEditText.empty() ? std::wstring(L" ") : m_widthEditText;
				const float textWidth = UiTextWidth(g, editText, m_fonts->monoSmall);
				const float caretX =
				    m_widthValueRect.X + m_widthValueRect.Width - 6.0f * m_scale - textWidth;
				UiText(g, editText + L" px", m_fonts->monoSmall, m_widthValueRect, m_theme->textStrong,
				       TextAlign::RIGHT);
				if (caretX > m_widthValueRect.X)
				{
					const float caretY = m_widthValueRect.Y + 5.0f * m_scale;
					UiDrawLine(g, caretX, caretY, caretX, m_widthValueRect.Y + rowHeight - 5.0f * m_scale,
					           m_theme->accent, 1.4f * m_scale);
				}
			}
			else
			{
				UiText(g, FormatNumber(style->lineWidth, 1) + L" px", m_fonts->monoSmall, m_widthValueRect,
				       m_theme->textStrong, TextAlign::CENTER);
			}

			const bool minusHot = (m_hoverStyle == StyleHit::WIDTH_MINUS);
			const bool plusHot = (m_hoverStyle == StyleHit::WIDTH_PLUS);
			const bool minusEnabled = style->lineWidth > (kWidthMin + 1.0e-4f);
			const bool plusEnabled = style->lineWidth < (kWidthMax - 1.0e-4f);

			if (minusHot && minusEnabled)
			{
				UiFillRoundRect(g, m_widthMinusRect, kCorner * m_scale, m_theme->hover);
			}
			if (plusHot && plusEnabled)
			{
				UiFillRoundRect(g, m_widthPlusRect, kCorner * m_scale, m_theme->hover);
			}

			UiDrawArrowIcon(g, m_widthMinusRect, minusEnabled ? m_theme->text : m_theme->textMuted,
			                1.6f * m_scale, IconDirection::LEFT);
			UiDrawArrowIcon(g, m_widthPlusRect, plusEnabled ? m_theme->text : m_theme->textMuted,
			                1.6f * m_scale, IconDirection::RIGHT);
		}

		// ---- 第三行：样式 ----
		{
			UiText(g, L"样式", m_fonts->uiSmall, gd::RectF(labelX, m_modeRects[0].Y, labelWidth, rowHeight),
			       m_theme->textMuted, TextAlign::LEFT);

			for (int index = 0; index < kModeOptionCount; ++index)
			{
				const gd::RectF& rect = m_modeRects[static_cast<std::size_t>(index)];
				const bool active = (style->mode == kModeOptions[index]);
				const bool hovered = (m_hoverStyle == StyleHit::MODE && m_hoverStyleIndex == index);

				UiFillRoundRect(g, rect, kCorner * m_scale,
				                active ? m_theme->accentSoft : (hovered ? m_theme->hover : m_theme->cardBg));
				UiDrawRoundRect(g, rect, kCorner * m_scale, active ? m_theme->accent : m_theme->border, 1.0f);
				UiText(g, DrawModeName(kModeOptions[index]), m_fonts->uiSmall, rect,
				       active ? m_theme->textStrong : m_theme->text, TextAlign::CENTER);
			}
		}

		// ---- 第四行：不透明度 ----
		{
			UiText(g, L"透明度", m_fonts->uiSmall,
			       gd::RectF(labelX, m_opacityValueRect.Y, labelWidth, rowHeight), m_theme->textMuted,
			       TextAlign::LEFT);

			const bool active = m_draggingOpacity || (m_hoverStyle == StyleHit::OPACITY);
			DrawSlider(g, m_opacityTrackRect, static_cast<double>(style->opacity), m_theme->accent, active,
			           m_scale);

			const int percent = static_cast<int>(style->opacity * 100.0f + 0.5f);
			UiText(g, std::to_wstring(percent) + L"%", m_fonts->monoSmall, m_opacityValueRect,
			       m_theme->textStrong, TextAlign::RIGHT);
		}
	}

	bool SignalPanel::AreAllSignalsVisible() const
	{
		if (m_dataSet == nullptr || m_tab == nullptr || m_dataSet->Empty())
		{
			return false;
		}
		return m_tab->VisibleCount() == TotalSignalCount();
	}

	bool SignalPanel::StepLineWidth(float delta)
	{
		if (m_tab == nullptr)
		{
			return false;
		}
		SignalStyle* style = m_tab->Style(m_tab->Selected());
		if (style == nullptr)
		{
			return false;
		}

		float value = ClampFloat(style->lineWidth + delta, kWidthMin, kWidthMax);
		value = std::round(value * 10.0f) / 10.0f;
		if (std::fabs(value - style->lineWidth) < 0.001f)
		{
			return false;
		}
		style->lineWidth = value;
		return true;
	}

	bool SignalPanel::BeginWidthEdit()
	{
		if (m_tab == nullptr)
		{
			return false;
		}
		const SignalStyle* style = m_tab->Style(m_tab->Selected());
		if (style == nullptr)
		{
			return false;
		}
		if (m_widthEditing)
		{
			return false;
		}

		m_widthEditText = FormatNumber(style->lineWidth, 1);
		m_widthEditing = true;
		m_widthEditFresh = true;
		return true;
	}

	bool SignalPanel::EndWidthEdit(bool commit)
	{
		if (!m_widthEditing)
		{
			return false;
		}

		bool changed = true;
		if (commit && m_tab != nullptr)
		{
			const std::wstring trimmed = Trim(m_widthEditText);
			if (!trimmed.empty())
			{
				wchar_t* stop = nullptr;
				const double parsed = std::wcstod(trimmed.c_str(), &stop);
				if (stop != trimmed.c_str() && parsed == parsed)
				{
					if (SignalStyle* style = m_tab->Style(m_tab->Selected()))
					{
						const float value = ClampFloat(static_cast<float>(parsed), kWidthMin, kWidthMax);
						style->lineWidth = std::round(value * 10.0f) / 10.0f;
					}
				}
			}
		}

		m_widthEditing = false;
		m_widthEditFresh = false;
		m_widthEditText.clear();
		return changed;
	}

	bool SignalPanel::OnEditChar(wchar_t character)
	{
		if (!m_widthEditing)
		{
			return false;
		}

		if (character == L'\r' || character == L'\n')
		{
			return EndWidthEdit(true);
		}
		if (character == L'\b')
		{
			m_widthEditFresh = false;
			if (!m_widthEditText.empty())
			{
				m_widthEditText.pop_back();
			}
			return true;
		}

		if (character >= L'0' && character <= L'9')
		{
			// 首次键入直接替换原有数值，无需先手动删除。
			if (m_widthEditFresh)
			{
				m_widthEditText.clear();
				m_widthEditFresh = false;
			}
			if (m_widthEditText.size() < 5)
			{
				m_widthEditText.push_back(character);
			}
			return true;
		}
		if (character == L'.')
		{
			if (m_widthEditFresh)
			{
				m_widthEditText.clear();
				m_widthEditFresh = false;
			}
			// 只允许一个小数点。
			if (m_widthEditText.find(L'.') == std::wstring::npos && m_widthEditText.size() < 4)
			{
				m_widthEditText.push_back(character);
			}
			return true;
		}
		return true;
	}

	bool SignalPanel::OnEditKey(WPARAM key)
	{
		if (!m_widthEditing)
		{
			return false;
		}

		switch (key)
		{
		case VK_RETURN:
			return EndWidthEdit(true);
		case VK_ESCAPE:
			return EndWidthEdit(false);
		case VK_BACK:
			m_widthEditFresh = false;
			if (!m_widthEditText.empty())
			{
				m_widthEditText.pop_back();
			}
			return true;
		default:
			break;
		}
		return true;
	}

	bool SignalPanel::ApplyColor(std::uint32_t color)
	{
		if (m_tab == nullptr)
		{
			return false;
		}
		SignalStyle* style = m_tab->Style(m_tab->Selected());
		if (style == nullptr)
		{
			return false;
		}
		if (style->color == color)
		{
			return false;
		}
		style->color = color;
		return true;
	}

	bool SignalPanel::ApplyOpacityFromX(float x)
	{
		if (m_tab == nullptr)
		{
			return false;
		}
		SignalStyle* style = m_tab->Style(m_tab->Selected());
		if (style == nullptr)
		{
			return false;
		}

		const float value = static_cast<float>(UiSliderRatioFromX(m_opacityTrackRect, x));
		if (std::fabs(value - style->opacity) < 0.005f)
		{
			return false;
		}
		style->opacity = value;
		return true;
	}

	bool SignalPanel::OpenColorPickerPopup(const SignalStyle& style)
	{
		if (m_colorPicker == nullptr)
		{
			return false;
		}

		const gd::RectF bounds = (m_clientBounds.Width > 1.0f) ? m_clientBounds : m_area;
		m_colorPicker->Open(bounds, static_cast<int>(m_customChipRect.X),
		                    static_cast<int>(m_customChipRect.Y + m_customChipRect.Height), style.color);
		return true;
	}

	bool SignalPanel::CloseTransientUi()
	{
		bool changed = false;
		if (m_widthEditing)
		{
			changed = EndWidthEdit(true) || changed;
		}
		if (m_colorPicker != nullptr && m_colorPicker->IsOpen())
		{
			m_colorPicker->Close();
			changed = true;
		}
		return changed;
	}

	bool SignalPanel::OnMouseMove(int x, int y)
	{
		// 拖拽优先级最高。
		if (m_draggingOpacity)
		{
			return ApplyOpacityFromX(static_cast<float>(x));
		}
		if (m_draggingScrollBar)
		{
			const gd::RectF thumb = ScrollThumbRect();
			const float travel = static_cast<float>(y - m_scrollGrabOffset) - m_scrollBarRect.Y;
			const float usable = m_scrollBarRect.Height - thumb.Height;
			if (usable > 0.0f)
			{
				const float progress = std::max(0.0f, std::min(1.0f, travel / usable));
				m_scrollOffset = progress * (m_contentHeight - m_listRect.Height);
				ClampScroll();
			}
			return true;
		}

		RowPart part = RowPart::NONE;
		const int hoverRow = HitRow(x, y, part);

		StyleHit hoverStyle = StyleHit::NONE;
		int hoverStyleIndex = -1;

		const float fx = static_cast<float>(x);
		const float fy = static_cast<float>(y);

		if (UiPointInRect(m_toggleAllRect, fx, fy))
		{
			hoverStyle = StyleHit::TOGGLE_ALL;
		}
		else if (m_tab != nullptr && m_tab->Style(m_tab->Selected()) != nullptr)
		{
			for (int index = 0; index < m_colorCount; ++index)
			{
				if (UiPointInRect(m_colorRects[static_cast<std::size_t>(index)], fx, fy))
				{
					hoverStyle = StyleHit::COLOR;
					hoverStyleIndex = index;
					break;
				}
			}
			if (hoverStyle == StyleHit::NONE && UiPointInRect(m_customChipRect, fx, fy))
			{
				hoverStyle = StyleHit::CUSTOM_CHIP;
			}
			if (hoverStyle == StyleHit::NONE && UiPointInRect(m_widthThinRect, fx, fy))
			{
				hoverStyle = StyleHit::WIDTH_PRESET;
				hoverStyleIndex = 0;
			}
			if (hoverStyle == StyleHit::NONE && UiPointInRect(m_widthThickRect, fx, fy))
			{
				hoverStyle = StyleHit::WIDTH_PRESET;
				hoverStyleIndex = 1;
			}
			if (hoverStyle == StyleHit::NONE && UiPointInRect(m_widthMinusRect, fx, fy))
			{
				hoverStyle = StyleHit::WIDTH_MINUS;
			}
			if (hoverStyle == StyleHit::NONE && UiPointInRect(m_widthPlusRect, fx, fy))
			{
				hoverStyle = StyleHit::WIDTH_PLUS;
			}
			if (hoverStyle == StyleHit::NONE && UiPointInRect(m_widthValueRect, fx, fy))
			{
				hoverStyle = StyleHit::WIDTH_VALUE;
			}
			if (hoverStyle == StyleHit::NONE)
			{
				for (int index = 0; index < kModeOptionCount; ++index)
				{
					if (UiPointInRect(m_modeRects[static_cast<std::size_t>(index)], fx, fy))
					{
						hoverStyle = StyleHit::MODE;
						hoverStyleIndex = index;
						break;
					}
				}
			}
			if (hoverStyle == StyleHit::NONE &&
			    UiPointInRect(SliderHitRect(m_opacityTrackRect, m_scale), fx, fy))
			{
				hoverStyle = StyleHit::OPACITY;
			}
		}

		if (hoverRow == m_hoverRow && hoverStyle == m_hoverStyle && hoverStyleIndex == m_hoverStyleIndex &&
		    part == m_hoverPart)
		{
			return false;
		}

		m_hoverRow = hoverRow;
		m_hoverPart = part;
		m_hoverStyle = hoverStyle;
		m_hoverStyleIndex = hoverStyleIndex;
		return true;
	}

	bool SignalPanel::OnLButtonDown(int x, int y)
	{
		if (m_dataSet == nullptr || m_tab == nullptr)
		{
			return false;
		}

		const float fx = static_cast<float>(x);
		const float fy = static_cast<float>(y);

		// 滚动条拖拽优先于其它命中测试。
		if (m_scrollBarVisible && UiPointInRect(m_scrollBarRect, fx, fy))
		{
			const gd::RectF thumb = ScrollThumbRect();
			m_draggingScrollBar = true;
			if (UiPointInRect(thumb, fx, fy))
			{
				m_scrollGrabOffset = y - static_cast<int>(thumb.Y);
			}
			else
			{
				m_scrollGrabOffset = static_cast<int>(thumb.Height * 0.5f);
				const float travel = fy - m_scrollBarRect.Y - static_cast<float>(m_scrollGrabOffset);
				const float usable = m_scrollBarRect.Height - thumb.Height;
				if (usable > 0.0f)
				{
					const float progress = std::max(0.0f, std::min(1.0f, travel / usable));
					m_scrollOffset = progress * (m_contentHeight - m_listRect.Height);
					ClampScroll();
				}
			}
			return true;
		}

		m_pendingLaneMenu = false;
		m_pendingColorPicker = false;

		// 点击样式区以外的位置时结束线宽输入。
		if (m_widthEditing && !UiPointInRect(m_widthValueRect, fx, fy))
		{
			EndWidthEdit(true);
		}

		// 全部显示/隐藏。
		if (UiPointInRect(m_toggleAllRect, fx, fy))
		{
			m_tab->SetAllVisible(*m_dataSet, !AreAllSignalsVisible());
			m_rowsDirty = true;
			return true;
		}

		// 样式编辑区。
		if (SignalStyle* style = m_tab->Style(m_tab->Selected()))
		{
			int paletteCount = 0;
			const std::uint32_t* palette = SignalPalette(paletteCount);
			for (int index = 0; index < m_colorCount; ++index)
			{
				if (UiPointInRect(m_colorRects[static_cast<std::size_t>(index)], fx, fy))
				{
					style->color = palette[index % paletteCount];
					return true;
				}
			}
			if (UiPointInRect(m_customChipRect, fx, fy))
			{
				// 在左键抬起时展开，避免按下即被后续消息立即收起。
				m_pendingColorPicker = true;
				return true;
			}
			if (UiPointInRect(m_widthThinRect, fx, fy))
			{
				style->lineWidth = kWidthThinPreset;
				return true;
			}
			if (UiPointInRect(m_widthThickRect, fx, fy))
			{
				style->lineWidth = kWidthThickPreset;
				return true;
			}
			if (UiPointInRect(m_widthMinusRect, fx, fy))
			{
				return StepLineWidth(-kWidthStep);
			}
			if (UiPointInRect(m_widthPlusRect, fx, fy))
			{
				return StepLineWidth(kWidthStep);
			}
			if (UiPointInRect(m_widthValueRect, fx, fy))
			{
				// 单击即进入输入状态，双击亦等效。
				return BeginWidthEdit();
			}
			for (int index = 0; index < kModeOptionCount; ++index)
			{
				if (UiPointInRect(m_modeRects[static_cast<std::size_t>(index)], fx, fy))
				{
					style->mode = kModeOptions[index];
					return true;
				}
			}
			if (UiPointInRect(SliderHitRect(m_opacityTrackRect, m_scale), fx, fy))
			{
				m_draggingOpacity = true;
				return ApplyOpacityFromX(fx) || true;
			}
		}

		// 列表行。
		RowPart part = RowPart::NONE;
		const int row = HitRow(x, y, part);
		if (row < 0)
		{
			return false;
		}

		const ListRow& item = m_rows[static_cast<std::size_t>(row)];

		if (item.kind == RowKind::FILE)
		{
			if (part == RowPart::CHECK)
			{
				const bool allVisible = m_tab->FileAllVisible(*m_dataSet, item.fileIndex);
				m_tab->SetFileVisible(*m_dataSet, item.fileIndex, !allVisible);
				m_rowsDirty = true;
				return true;
			}
			if (part == RowPart::CLOSE)
			{
				// 关闭文件属于数据层操作，交由宿主窗口处理。
				if (m_host != nullptr)
				{
					PostMessageW(m_host, WM_APP + 1, static_cast<WPARAM>(item.fileIndex), 0);
				}
				return true;
			}
			m_tab->ToggleCollapsed(item.fileIndex);
			m_rowsDirty = true;
			return true;
		}

		const SignalRef ref{item.fileIndex, item.signalIndex};
		m_tab->SetSelected(ref);

		if (part == RowPart::CHECK)
		{
			// 勾选/取消勾选会立即触发网格重新划分（取消后空网格随之消失）。
			m_tab->ToggleVisible(*m_dataSet, ref);
			m_rowsDirty = true;
		}
		else if (part == RowPart::LANE_BADGE)
		{
			// 在左键抬起时弹出，保证菜单不会随着按键松开而消失。
			m_pendingLaneMenu = true;
			m_pendingLaneRef = ref;
		}
		return true;
	}

	bool SignalPanel::OnLButtonUp(int x, int y)
	{
		bool changed = false;

		if (m_draggingOpacity)
		{
			m_draggingOpacity = false;
			changed = true;
		}
		if (m_draggingScrollBar)
		{
			m_draggingScrollBar = false;
			changed = true;
		}

		if (m_pendingColorPicker)
		{
			m_pendingColorPicker = false;
			const float fx = static_cast<float>(x);
			const float fy = static_cast<float>(y);
			if (UiPointInRect(m_customChipRect, fx, fy) && m_tab != nullptr)
			{
				if (const SignalStyle* style = m_tab->Style(m_tab->Selected()))
				{
					changed = OpenColorPickerPopup(*style) || changed;
				}
			}
		}

		if (m_pendingLaneMenu)
		{
			m_pendingLaneMenu = false;
			RowPart part = RowPart::NONE;
			const int row = HitRow(x, y, part);
			if (row >= 0 && part == RowPart::LANE_BADGE)
			{
				const ListRow& item = m_rows[static_cast<std::size_t>(row)];
				const SignalRef ref{item.fileIndex, item.signalIndex};
				if (ref == m_pendingLaneRef)
				{
					const gd::RectF badge = SignalBadgeRect(row);
					OpenLaneMenu(ref, static_cast<int>(badge.X),
					             static_cast<int>(badge.Y + badge.Height));
					changed = true;
				}
			}
		}

		return changed;
	}

	bool SignalPanel::OnDoubleClick(int x, int y)
	{
		if (m_dataSet == nullptr || m_tab == nullptr)
		{
			return false;
		}

		const float fx = static_cast<float>(x);
		const float fy = static_cast<float>(y);

		// 线宽数值框：双击进入（或保持）输入状态。
		if (UiPointInRect(m_widthValueRect, fx, fy))
		{
			return BeginWidthEdit();
		}

		RowPart part = RowPart::NONE;
		const int row = HitRow(x, y, part);
		if (row < 0)
		{
			return false;
		}

		const ListRow& item = m_rows[static_cast<std::size_t>(row)];
		if (item.kind == RowKind::FILE)
		{
			m_tab->ToggleCollapsed(item.fileIndex);
			m_rowsDirty = true;
			return true;
		}

		// 网格徽标单击已可打开菜单，双击不再切换可见性。
		if (part == RowPart::LANE_BADGE)
		{
			return false;
		}

		const SignalRef ref{item.fileIndex, item.signalIndex};
		m_tab->SetSelected(ref);
		m_tab->ToggleVisible(*m_dataSet, ref);
		m_rowsDirty = true;
		return true;
	}

	bool SignalPanel::OnRButtonDown(int x, int y)
	{
		if (m_dataSet == nullptr || m_tab == nullptr)
		{
			return false;
		}

		RowPart part = RowPart::NONE;
		const int row = HitRow(x, y, part);
		if (row < 0)
		{
			return false;
		}

		const ListRow& item = m_rows[static_cast<std::size_t>(row)];
		if (item.kind == RowKind::FILE)
		{
			OpenFileMenu(item.fileIndex, x, y);
			return true;
		}

		const SignalRef ref{item.fileIndex, item.signalIndex};
		m_tab->SetSelected(ref);
		OpenSignalMenu(ref, x, y);
		return true;
	}

	bool SignalPanel::OnMouseWheel(int delta)
	{
		if (m_dataSet == nullptr)
		{
			return false;
		}

		const float previous = m_scrollOffset;
		m_scrollOffset -= static_cast<float>(delta) / 120.0f * 54.0f * m_scale;
		ClampScroll();
		return std::fabs(previous - m_scrollOffset) > 0.01f;
	}

	bool SignalPanel::OnMouseLeave()
	{
		if (m_hoverRow < 0 && m_hoverStyle == StyleHit::NONE)
		{
			return false;
		}
		m_hoverRow = -1;
		m_hoverPart = RowPart::NONE;
		m_hoverStyle = StyleHit::NONE;
		m_hoverStyleIndex = -1;
		return true;
	}

	void SignalPanel::OpenSignalMenu(const SignalRef& ref, int x, int y)
	{
		if (m_menu == nullptr || m_tab == nullptr || m_dataSet == nullptr)
		{
			return;
		}

		const SignalStyle* style = m_tab->Style(ref);
		const SignalData* signal = m_dataSet->Resolve(ref);
		if (style == nullptr || signal == nullptr)
		{
			return;
		}

		m_menuTargetSignal = ref;
		m_menuTargetFile = -1;

		std::vector<MenuItem> items;

		MenuItem header;
		header.kind = MenuItemKind::HEADER;
		header.label = signal->name;
		items.push_back(header);

		MenuItem toggle;
		toggle.label = style->visible ? L"隐藏该信号" : L"显示该信号";
		toggle.id = CMD_SIGNAL_TOGGLE;
		items.push_back(toggle);

		MenuItem solo;
		solo.label = L"仅显示该信号";
		solo.id = CMD_SIGNAL_SOLO;
		items.push_back(solo);

		MenuItem showAll;
		showAll.label = L"显示全部信号";
		showAll.id = CMD_SIGNAL_SHOW_ALL;
		items.push_back(showAll);

		MenuItem hideAll;
		hideAll.label = L"隐藏全部信号";
		hideAll.id = CMD_SIGNAL_HIDE_ALL;
		items.push_back(hideAll);

		MenuItem separator;
		separator.kind = MenuItemKind::SEPARATOR;
		items.push_back(separator);

		int paletteCount = 0;
		const std::uint32_t* palette = SignalPalette(paletteCount);
		MenuItem colors;
		colors.kind = MenuItemKind::SWATCHES;
		colors.id = CMD_COLOR_BASE;
		colors.swatchCount = std::min(paletteCount, 16);
		colors.checkedSwatch = -1;
		for (int index = 0; index < colors.swatchCount; ++index)
		{
			colors.swatches[index] = palette[index];
			if (style->color == palette[index])
			{
				colors.checkedSwatch = index;
			}
		}
		items.push_back(colors);

		MenuItem modeHeader;
		modeHeader.kind = MenuItemKind::HEADER;
		modeHeader.label = L"样式";
		items.push_back(modeHeader);

		for (int index = 0; index < kModeOptionCount; ++index)
		{
			MenuItem mode;
			mode.label = DrawModeName(kModeOptions[index]);
			mode.id = CMD_MODE_BASE + index;
			mode.checked = (style->mode == kModeOptions[index]);
			items.push_back(mode);
		}

		const gd::RectF bounds = (m_clientBounds.Width > 1.0f) ? m_clientBounds : m_area;
		m_menu->Open(MenuScope::SIGNAL_PANEL, bounds, x, y, items);
	}

	void SignalPanel::OpenFileMenu(int fileIndex, int x, int y)
	{
		if (m_menu == nullptr || m_tab == nullptr || m_dataSet == nullptr)
		{
			return;
		}

		const DataFile* file = m_dataSet->FileAt(fileIndex);
		if (file == nullptr)
		{
			return;
		}

		m_menuTargetFile = fileIndex;
		m_menuTargetSignal = SignalRef();

		std::vector<MenuItem> items;

		MenuItem header;
		header.kind = MenuItemKind::HEADER;
		header.label = file->fileName;
		items.push_back(header);

		MenuItem showAll;
		showAll.label = L"选中该文件全部信号";
		showAll.id = CMD_FILE_SHOW_ALL;
		items.push_back(showAll);

		MenuItem hideAll;
		hideAll.label = L"取消该文件全部信号";
		hideAll.id = CMD_FILE_HIDE_ALL;
		items.push_back(hideAll);

		MenuItem separator;
		separator.kind = MenuItemKind::SEPARATOR;
		items.push_back(separator);

		MenuItem remove;
		remove.label = L"关闭该文件（从工作区移除）";
		remove.id = CMD_FILE_REMOVE;
		items.push_back(remove);

		const gd::RectF bounds = (m_clientBounds.Width > 1.0f) ? m_clientBounds : m_area;
		m_menu->Open(MenuScope::SIGNAL_PANEL, bounds, x, y, items);
	}

	void SignalPanel::OpenLaneMenu(const SignalRef& ref, int x, int y)
	{
		if (m_menu == nullptr || m_tab == nullptr || m_dataSet == nullptr)
		{
			return;
		}

		const SignalData* signal = m_dataSet->Resolve(ref);
		if (signal == nullptr)
		{
			return;
		}

		m_menuTargetSignal = ref;
		m_menuTargetFile = -1;

		std::vector<MenuItem> items;

		MenuItem header;
		header.kind = MenuItemKind::HEADER;
		header.label = L"所属网格";
		items.push_back(header);

		const std::vector<Lane>& lanes = m_tab->Lanes();
		const int currentLane = m_tab->LaneOfSignal(ref);
		for (std::size_t index = 0; index < lanes.size(); ++index)
		{
			MenuItem lane;
			lane.label = L"网格 " + std::to_wstring(index + 1) + L"（" +
			             std::to_wstring(lanes[index].signals.size()) + L" 条信号）";
			lane.id = CMD_LANE_BASE + static_cast<int>(index);
			lane.checked = (currentLane == static_cast<int>(index));
			items.push_back(lane);
		}

		MenuItem separator;
		separator.kind = MenuItemKind::SEPARATOR;
		items.push_back(separator);

		MenuItem create;
		create.label = L"新建网格";
		create.id = CMD_LANE_NEW;
		items.push_back(create);

		const gd::RectF bounds = (m_clientBounds.Width > 1.0f) ? m_clientBounds : m_area;
		m_menu->Open(MenuScope::SIGNAL_PANEL, bounds, x, y, items);
	}

	bool SignalPanel::OnMenuCommand(const MenuResult& result)
	{
		if (m_tab == nullptr || m_dataSet == nullptr || !result.valid)
		{
			return false;
		}

		bool needRelayout = false;

		switch (result.id)
		{
		case CMD_SIGNAL_TOGGLE:
			if (m_menuTargetSignal.IsValid())
			{
				m_tab->ToggleVisible(*m_dataSet, m_menuTargetSignal);
				m_rowsDirty = true;
				needRelayout = true;
			}
			break;
		case CMD_SIGNAL_SOLO:
			if (m_menuTargetSignal.IsValid())
			{
				m_tab->SoloSignal(*m_dataSet, m_menuTargetSignal);
				m_rowsDirty = true;
				needRelayout = true;
			}
			break;
		case CMD_SIGNAL_SHOW_ALL:
			m_tab->SetAllVisible(*m_dataSet, true);
			m_rowsDirty = true;
			needRelayout = true;
			break;
		case CMD_SIGNAL_HIDE_ALL:
			m_tab->SetAllVisible(*m_dataSet, false);
			m_rowsDirty = true;
			needRelayout = true;
			break;
		case CMD_FILE_SHOW_ALL:
			if (m_menuTargetFile >= 0)
			{
				m_tab->SetFileVisible(*m_dataSet, m_menuTargetFile, true);
				m_rowsDirty = true;
				needRelayout = true;
			}
			break;
		case CMD_FILE_HIDE_ALL:
			if (m_menuTargetFile >= 0)
			{
				m_tab->SetFileVisible(*m_dataSet, m_menuTargetFile, false);
				m_rowsDirty = true;
				needRelayout = true;
			}
			break;
		case CMD_FILE_REMOVE:
			if (m_menuTargetFile >= 0 && m_host != nullptr)
			{
				PostMessageW(m_host, WM_APP + 1, static_cast<WPARAM>(m_menuTargetFile), 0);
			}
			break;
		case CMD_LANE_NEW:
			if (m_menuTargetSignal.IsValid())
			{
				m_tab->MoveSignalToLane(*m_dataSet, m_menuTargetSignal, -1);
				m_rowsDirty = true;
				needRelayout = true;
			}
			break;
		default:
			if (result.id >= CMD_LANE_BASE && result.id < CMD_LANE_NEW)
			{
				if (m_menuTargetSignal.IsValid())
				{
					m_tab->MoveSignalToLane(*m_dataSet, m_menuTargetSignal, result.id - CMD_LANE_BASE);
					m_rowsDirty = true;
					needRelayout = true;
				}
			}
			else if (result.id == CMD_COLOR_BASE && result.swatchIndex >= 0)
			{
				if (SignalStyle* style = m_tab->Style(m_menuTargetSignal))
				{
					int paletteCount = 0;
					const std::uint32_t* palette = SignalPalette(paletteCount);
					style->color = palette[result.swatchIndex % std::max(1, paletteCount)];
				}
			}
			else if (result.id >= CMD_MODE_BASE && result.id < CMD_MODE_BASE + kModeOptionCount)
			{
				if (SignalStyle* style = m_tab->Style(m_menuTargetSignal))
				{
					style->mode = kModeOptions[result.id - CMD_MODE_BASE];
				}
			}
			break;
		}

		return needRelayout;
	}

} // namespace jdi