#include "Application.hpp"

#include <algorithm>
#include <atomic>
#include <cmath>
#include <thread>

#include <commdlg.h>
#include <shellapi.h>
#include <windowsx.h>

#include "CsvTable.hpp"
#include "ResourceIds.h"
#include "Utf8Util.hpp"

#ifndef WM_DPICHANGED
#define WM_DPICHANGED 0x02E0
#endif

#ifndef DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2
#define DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2 (reinterpret_cast<HANDLE>(-4))
#endif

namespace jdi
{

	namespace
	{
		const wchar_t* kWindowClassName = L"JustDataInspectorMainWindow";	/**< 窗口类名。 */
		const wchar_t* kWindowTitle = L"Just DataInspector";				/**< 窗口标题（仅显示应用名称）。 */
		const float kSplitterWidth = 4.0f;									/**< 分隔条宽度（逻辑像素）。 */
		const float kMinPanelWidth = 260.0f;								/**< 面板最小宽度（逻辑像素）。 */
		const float kMaxPanelWidth = 400.0f;								/**< 面板最大宽度（逻辑像素）。 */
		const int kMinClientWidth = 860;									/**< 窗口最小客户区宽度。 */
		const int kMinClientHeight = 540;									/**< 窗口最小客户区高度。 */
		const UINT kMessageRemoveFile = WM_APP + 1;							/**< 面板请求移除文件的自定义消息。 */
		const UINT kMessageRemoveSignal = WM_APP + 2;						/**< 面板请求移除单个信号的自定义消息。 */
		const UINT_PTR kHintTimerId = 1;									/**< 提示浮层淡出用的定时器 ID。 */
		const UINT kHintTimerPeriodMs = 33;									/**< 提示浮层淡出的重绘间隔（约 30fps）。 */

		/**
		 * @brief 只失效绘图区所在的矩形。
		 *
		 * 配合 WM_PAINT 中对更新区域的判断，可以走“只重绘、只回送绘图区”的快路径；
		 * 绘图区矩形无效时退化为整窗失效，保证不会漏画。
		 *
		 * @param [IN] hwnd 窗口句柄。
		 * @param [IN] plotRect 绘图区矩形（客户区坐标）。
		 */
		void InvalidatePlotRect(HWND hwnd, const gd::RectF& plotRect)
		{
			RECT invalid = {};
			invalid.left = static_cast<LONG>(std::floor(plotRect.X));
			invalid.top = static_cast<LONG>(std::floor(plotRect.Y));
			invalid.right = static_cast<LONG>(std::ceil(plotRect.X + plotRect.Width));
			invalid.bottom = static_cast<LONG>(std::ceil(plotRect.Y + plotRect.Height));
			if (invalid.right > invalid.left && invalid.bottom > invalid.top)
			{
				InvalidateRect(hwnd, &invalid, FALSE);
			}
			else
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
		}

		/** @brief 标签页右键菜单命令 ID。 */
		const int kMenuTabNew = 1;
		const int kMenuTabClose = 2;
		const int kMenuTabCloseOthers = 3;

		/**
		 * @brief 从应用资源中按指定尺寸加载图标。
		 * @param [IN] cx 期望宽度（像素）。
		 * @param [IN] cy 期望高度（像素）。
		 * @return 图标句柄，加载失败返回 nullptr。
		 */
		HICON LoadAppIcon(int cx, int cy)
		{
			HINSTANCE module = GetModuleHandleW(nullptr);
			// LR_DEFAULTSIZE 之外的显式尺寸请求会挑选 ICO 中最接近的一帧并由系统缩放，
			// 因此 256/64/48/32/16 的多尺寸资源在任意 DPI 下都能取到合适的一帧。
			HICON icon = static_cast<HICON>(LoadImageW(module, MAKEINTRESOURCEW(IDI_APP_ICON), IMAGE_ICON,
			                                           cx, cy, LR_DEFAULTCOLOR));
			if (icon == nullptr)
			{
				icon = static_cast<HICON>(LoadImageW(module, MAKEINTRESOURCEW(IDI_APP_ICON), IMAGE_ICON, 0, 0,
				                                     LR_DEFAULTCOLOR | LR_DEFAULTSIZE));
			}
			return icon;
		}

		/**
		 * @brief 后台加载任务的共享状态。
		 *
		 * `done` 是唯一的同步点：工作线程写完其它字段后以 release 语义置位，
		 * 主线程以 acquire 语义读取，因此无需额外锁。
		 */
		struct AsyncLoadState
		{
			std::atomic<bool> done{false};		/**< 工作线程是否已结束。 */
			std::atomic<bool> cancelled{false};	/**< 是否请求取消。 */
			std::atomic<float> progress{0.0f};	/**< 0-1 进度。 */
			std::atomic<unsigned long long> bytesRead{0}; /**< 已读取字节数（解析阶段）。 */
			std::atomic<unsigned long long> totalBytes{0}; /**< 文件总字节数（0 表示未知）。 */
			bool ok = false;					/**< 加载是否成功。 */
			std::wstring error;					/**< 失败原因。 */
			DataFile file;						/**< 构建结果。 */
		};

		/**
		 * @brief 工作线程主体：解析 CSV 并构建数据文件（不接触 DataSet）。
		 * @param [IN,OUT] state 共享状态。
		 * @param [IN] path 文件路径。
		 * @param [IN] paletteBase 调色板起始序号。
		 */
		void RunAsyncLoad(AsyncLoadState* state, std::wstring path, std::size_t paletteBase)
		{
			// 解析阶段占总进度的 0-75%，列重组与统计占 75-100%。
			CsvProgress parseProgress = [state](const CsvProgressInfo& info)
			{
				state->progress.store(static_cast<float>(info.ratio * 0.75), std::memory_order_relaxed);
				if (info.hasBytes)
				{
					state->bytesRead.store(info.bytesRead, std::memory_order_relaxed);
					state->totalBytes.store(info.totalBytes, std::memory_order_relaxed);
				}
				return !state->cancelled.load(std::memory_order_relaxed);
			};

			CsvTable table;
			std::wstring error;
			if (!LoadCsvTable(path, table, error, parseProgress))
			{
				state->error = error;
				state->done.store(true, std::memory_order_release);
				return;
			}

			CsvProgress buildProgress = [state](const CsvProgressInfo& info)
			{
				state->progress.store(static_cast<float>(0.75 + info.ratio * 0.25),
				                      std::memory_order_relaxed);
				return !state->cancelled.load(std::memory_order_relaxed);
			};

			DataFile file;
			if (!BuildDataFile(std::move(table), path, paletteBase, file, error, buildProgress))
			{
				state->error = error;
				state->done.store(true, std::memory_order_release);
				return;
			}

			state->file = std::move(file);
			state->ok = true;
			state->progress.store(1.0f, std::memory_order_relaxed);
			state->done.store(true, std::memory_order_release);
		}

		/**
		 * @brief 开启进程级 DPI 感知（优先 Per-Monitor V2）。
		 */
		void EnableDpiAwareness()
		{
			HMODULE user32 = GetModuleHandleW(L"user32.dll");
			if (user32 != nullptr)
			{
				typedef BOOL(WINAPI * SetProcessDpiAwarenessContextFn)(HANDLE);
				SetProcessDpiAwarenessContextFn setContext =
				    reinterpret_cast<SetProcessDpiAwarenessContextFn>(
				        reinterpret_cast<void*>(GetProcAddress(user32, "SetProcessDpiAwarenessContext")));
				if (setContext != nullptr && setContext(DPI_AWARENESS_CONTEXT_PER_MONITOR_AWARE_V2) != FALSE)
				{
					return;
				}
			}
			SetProcessDPIAware();
		}

		/**
		 * @brief 查询屏幕 DPI。
		 * @return DPI 数值，失败时返回 96。
		 */
		UINT QuerySystemDpi()
		{
			HDC hdc = GetDC(nullptr);
			if (hdc == nullptr)
			{
				return 96u;
			}
			const int dpi = GetDeviceCaps(hdc, LOGPIXELSX);
			ReleaseDC(nullptr, hdc);
			return (dpi > 0) ? static_cast<UINT>(dpi) : 96u;
		}

		/**
		 * @brief 依据 DPI 缩放逻辑像素。
		 * @param [IN] value 逻辑像素值。
		 * @param [IN] scale 缩放比例。
		 * @return 物理像素值。
		 */
		float ScaleOf(float value, float scale)
		{
			return value * scale;
		}
	}

	Application& Application::Instance()
	{
		static Application instance;
		return instance;
	}

	LRESULT CALLBACK Application::WindowProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
	{
		Application* self = reinterpret_cast<Application*>(GetWindowLongPtrW(hwnd, GWLP_USERDATA));
		if (message == WM_NCCREATE)
		{
			CREATESTRUCTW* createStruct = reinterpret_cast<CREATESTRUCTW*>(lParam);
			self = reinterpret_cast<Application*>(createStruct->lpCreateParams);
			SetWindowLongPtrW(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(self));
		}

		if (self != nullptr)
		{
			return self->HandleMessage(hwnd, message, wParam, lParam);
		}
		return DefWindowProcW(hwnd, message, wParam, lParam);
	}

	int Application::Run(HINSTANCE instance, int showCommand)
	{
		if (!Initialize(instance, showCommand))
		{
			return 1;
		}

		MSG message = {};
		while (GetMessageW(&message, nullptr, 0, 0) > 0)
		{
			TranslateMessage(&message);
			DispatchMessageW(&message);
		}

		Shutdown();
		return static_cast<int>(message.wParam);
	}

	bool Application::Initialize(HINSTANCE instance, int showCommand)
	{
		m_instance = instance;

		EnableDpiAwareness();
		m_dpi = QuerySystemDpi();
		m_scale = static_cast<float>(m_dpi) / 96.0f;

		gd::GdiplusStartupInput startupInput;
		if (gd::GdiplusStartup(&m_gdiplusToken, &startupInput, nullptr) != gd::Ok)
		{
			MessageBoxW(nullptr, L"GDI+ 初始化失败，程序无法启动。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}
		m_gdiplusReady = true;

		m_theme = SolarizedLight();
		if (!m_fonts.Create(m_dpi))
		{
			m_gdiplusReady = false;
			gd::GdiplusShutdown(m_gdiplusToken);
			MessageBoxW(nullptr, L"界面字体创建失败，程序无法启动。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}

		WNDCLASSEXW windowClass = {};
		windowClass.cbSize = sizeof(windowClass);
		windowClass.style = CS_HREDRAW | CS_VREDRAW | CS_DBLCLKS;
		windowClass.lpfnWndProc = &Application::WindowProc;
		windowClass.hInstance = instance;
		windowClass.hCursor = LoadCursorW(nullptr, IDC_ARROW);
		windowClass.hbrBackground = nullptr;
		windowClass.lpszClassName = kWindowClassName;
		// 使用应用自己的图标资源（IDI_APP_ICON）；
		// 原先取 IDI_APPLICATION 是系统默认图标，导致标题栏与任务栏缩略图显示成"通用应用"图标。
		windowClass.hIcon = LoadAppIcon(GetSystemMetrics(SM_CXICON), GetSystemMetrics(SM_CYICON));
		windowClass.hIconSm = LoadAppIcon(GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON));

		if (RegisterClassExW(&windowClass) == 0)
		{
			MessageBoxW(nullptr, L"窗口类注册失败。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}

		// 依据工作区（排除任务栏）计算默认窗口尺寸并居中，避免窗口超出屏幕。
		RECT workArea = {0, 0, static_cast<LONG>(ScaleOf(1380.0f, m_scale)),
		                 static_cast<LONG>(ScaleOf(880.0f, m_scale))};
		SystemParametersInfoW(SPI_GETWORKAREA, 0, &workArea, 0);

		const int workWidth = workArea.right - workArea.left;
		const int workHeight = workArea.bottom - workArea.top;
		const int windowWidth = std::min(static_cast<int>(ScaleOf(1380.0f, m_scale)), workWidth - 24);
		const int windowHeight = std::min(static_cast<int>(ScaleOf(880.0f, m_scale)), workHeight - 24);
		const int windowX = workArea.left + std::max(0, (workWidth - windowWidth) / 2);
		const int windowY = workArea.top + std::max(0, (workHeight - windowHeight) / 2);

		m_hwnd = CreateWindowExW(WS_EX_ACCEPTFILES, kWindowClassName, kWindowTitle, WS_OVERLAPPEDWINDOW,
		                         windowX, windowY, windowWidth, windowHeight, nullptr, nullptr, instance,
		                         this);
		if (m_hwnd == nullptr)
		{
			MessageBoxW(nullptr, L"窗口创建失败。", kWindowTitle, MB_ICONERROR | MB_OK);
			return false;
		}

		m_tabBar.Setup(&m_fonts, &m_theme);
		m_tabBar.SetScale(m_scale);
		m_tabBar.SetHostWindow(m_hwnd);
		m_toolbar.Setup(&m_fonts, &m_theme);
		m_toolbar.SetScale(m_scale);
		m_menu.Setup(&m_fonts, &m_theme);
		m_menu.SetScale(m_scale);
		m_colorPicker.Setup(&m_fonts, &m_theme);
		m_colorPicker.SetScale(m_scale);
		m_colorPicker.SetOwnerWindow(m_hwnd);
		m_panel.Setup(m_hwnd, &m_fonts, &m_theme, &m_menu, &m_colorPicker);
		m_panel.SetScale(m_scale);
		m_plot.Setup(&m_fonts, &m_theme);
		m_plot.SetScale(m_scale);
		m_plot.SetHostWindow(m_hwnd);
		m_menu.SetHostWindow(m_hwnd);

		// 标题栏小图标与任务栏/Alt+Tab 缩略图大图标分开设置（同一个多尺寸 ICO 资源的不同尺寸）。
		HICON bigIcon = LoadAppIcon(GetSystemMetrics(SM_CXICON), GetSystemMetrics(SM_CYICON));
		HICON smallIcon = LoadAppIcon(GetSystemMetrics(SM_CXSMICON), GetSystemMetrics(SM_CYSMICON));
		if (bigIcon != nullptr)
		{
			SendMessageW(m_hwnd, WM_SETICON, ICON_BIG, reinterpret_cast<LPARAM>(bigIcon));
		}
		if (smallIcon != nullptr)
		{
			SendMessageW(m_hwnd, WM_SETICON, ICON_SMALL, reinterpret_cast<LPARAM>(smallIcon));
		}

		// 创建首个标签页。
		NewTab();

		Relayout();
		ShowWindow(m_hwnd, showCommand);
		UpdateWindow(m_hwnd);
		LoadCommandLineFiles();
		return true;
	}

	void Application::Shutdown()
	{
		ReleaseBackBuffer();
		m_fonts.Destroy();

		// 拾色器缓存了 GDI+ 位图（色域方块）：必须在 GdiplusShutdown 之前释放，
		// 否则位图析构会发生在 GDI+ 关闭之后，直接访问违例。
		m_colorPicker.Close();

		if (m_gdiplusReady)
		{
			gd::GdiplusShutdown(m_gdiplusToken);
			m_gdiplusReady = false;
		}
	}

	void Application::ApplyDpi(UINT dpi)
	{
		if (dpi == 0)
		{
			return;
		}

		m_dpi = dpi;
		m_scale = static_cast<float>(dpi) / 96.0f;

		m_fonts.Create(dpi);
		m_tabBar.SetScale(m_scale);
		m_toolbar.SetScale(m_scale);
		m_menu.SetScale(m_scale);
		m_colorPicker.SetScale(m_scale);
		m_panel.SetScale(m_scale);
		m_plot.SetScale(m_scale);
		ReleaseBackBuffer();
		Relayout();
	}

	TabConfig& Application::ActiveTab()
	{
		static TabConfig fallback;
		if (m_activeTab < 0 || m_activeTab >= static_cast<int>(m_tabs.size()))
		{
			return fallback;
		}
		return m_tabs[static_cast<std::size_t>(m_activeTab)];
	}

	const TabConfig& Application::ActiveTab() const
	{
		static const TabConfig fallback;
		if (m_activeTab < 0 || m_activeTab >= static_cast<int>(m_tabs.size()))
		{
			return fallback;
		}
		return m_tabs[static_cast<std::size_t>(m_activeTab)];
	}

	void Application::NewTab()
	{
		TabConfig tab;
		tab.SetName(NextTabName());
		tab.SyncToDataSet(m_dataSet);

		m_tabs.push_back(std::move(tab));
		SetActiveTab(static_cast<int>(m_tabs.size()) - 1);
	}

	std::wstring Application::NextTabName() const
	{
		// 取当前未被占用的最小编号，使关闭标签页后编号可以被复用（3 开 2 关再新建回到「视图 2」）。
		for (int number = 1; number <= static_cast<int>(m_tabs.size()) + 1; ++number)
		{
			const std::wstring candidate = L"视图 " + std::to_wstring(number);
			bool used = false;
			for (const TabConfig& tab : m_tabs)
			{
				if (tab.Name() == candidate)
				{
					used = true;
					break;
				}
			}
			if (!used)
			{
				return candidate;
			}
		}
		return L"视图 " + std::to_wstring(m_tabs.size() + 1);
	}

	void Application::CloseTab(int index)
	{
		if (index < 0 || index >= static_cast<int>(m_tabs.size()))
		{
			return;
		}
		if (m_tabs.size() <= 1)
		{
			SetStatusMessage(L"至少需要保留一个标签页。", true);
			return;
		}

		m_tabs.erase(m_tabs.begin() + index);

		int next = index;
		if (next >= static_cast<int>(m_tabs.size()))
		{
			next = static_cast<int>(m_tabs.size()) - 1;
		}
		SetActiveTab(next);
	}

	void Application::SetActiveTab(int index)
	{
		if (index < 0 || index >= static_cast<int>(m_tabs.size()))
		{
			return;
		}

		m_activeTab = index;

		// 重新绑定上下文：面板与绘图区均指向同一数据层与当前标签页配置。
		m_panel.SetContext(&m_dataSet, &m_tabs[static_cast<std::size_t>(m_activeTab)]);
		m_plot.SetContext(&m_dataSet, &m_tabs[static_cast<std::size_t>(m_activeTab)]);

		RefreshTabBar();
		Relayout();

		// 切换标签页后把该页已选中的信号滚动到可见位置。
		// 切换标签页后把共享的选中信号滚动到可见位置（选中状态跨页保持一致）。
		m_panel.ScrollToSignal(m_dataSet.Selected());

		SynchronizeView(true);
		UpdateWindowTitle();
		InvalidateRect(m_hwnd, nullptr, TRUE);
	}

	void Application::RefreshTabBar()
	{
		std::vector<std::wstring> names;
		names.reserve(m_tabs.size());
		for (const TabConfig& tab : m_tabs)
		{
			names.push_back(tab.Name());
		}
		m_tabBar.SetTabs(names);
		m_tabBar.SetActiveIndex(m_activeTab);
	}

	void Application::SynchronizeView(bool force)
	{
		if (m_tabs.empty() || m_activeTab < 0)
		{
			return;
		}

		TabConfig& tab = m_tabs[static_cast<std::size_t>(m_activeTab)];

		const int visibleCount = tab.VisibleCount();
		const bool anyVisible = tab.AnyVisible();
		const std::size_t laneCount = tab.Lanes().size();

		const bool changed = (visibleCount != m_cachedVisibleCount) || (anyVisible != m_cachedAnyVisible) ||
		                     (laneCount != m_cachedLaneCount);
		if (!changed && !force)
		{
			return;
		}

		const std::size_t previousLaneCount = m_cachedLaneCount;
		m_cachedVisibleCount = visibleCount;
		m_cachedAnyVisible = anyVisible;
		m_cachedLaneCount = laneCount;

		// 标签页首次出现可见信号时，把时间轴对齐到可见数据的范围。
		// 没有任何可见信号时（未勾选 / 全部取消勾选 / 清空网格）主动复位自适应标记，
		// 这样用户下一次勾选信号时会重新做一次自适应，而不是停留在上次的视图范围。
		if (!anyVisible)
		{
			tab.ViewInitialized() = false;
		}
		else if (!tab.ViewInitialized())
		{
			m_plot.FitAll();
		}

		const bool laneCountChanged = (laneCount != previousLaneCount);
		if (laneCountChanged || force)
		{
			// 网格数量变化会影响滚动条与绘图区宽度，必须重新布局。
			Relayout();
		}
		else
		{
			m_plot.RefreshLanes();
		}
	}

	void Application::SyncTabsToDataSet()
	{
		for (TabConfig& tab : m_tabs)
		{
			tab.SyncToDataSet(m_dataSet);
		}

		// 选中状态由数据层共享维护，数据变动后需校验其是否仍指向存在的信号。
		m_dataSet.ValidateSelection();
		m_panel.InvalidateRows();

		// 文件/信号结构变化会让信号引用与文件地址改变，派生缓存必须整体作废。
		m_plot.InvalidateDerivedCaches();

		// 强制下一次同步重新计算视图状态。
		m_cachedVisibleCount = -1;
		m_cachedAnyVisible = false;
		m_cachedLaneCount = 0;

		if (m_hwnd != nullptr)
		{
			InvalidateRect(m_hwnd, nullptr, TRUE);
		}
	}

	void Application::RemoveFile(int fileIndex)
	{
		const DataFile* file = m_dataSet.FileAt(fileIndex);
		if (file == nullptr)
		{
			return;
		}
		const std::wstring name = file->fileName;

		// 先按旧下标修正各标签页配置与共享选中项，再从数据层移除，最后统一对齐。
		for (TabConfig& tab : m_tabs)
		{
			tab.RemapAfterFileRemoval(fileIndex);
		}
		m_dataSet.RemapSelectionAfterFileRemoval(fileIndex);
		m_dataSet.RemoveFile(fileIndex);
		SyncTabsToDataSet();

		SetStatusMessage(L"已从工作区移除：" + name, false);
		UpdateWindowTitle();
	}

	void Application::RemoveSignal(int fileIndex, int signalIndex)
	{
		SignalRef target;
		target.fileIndex = fileIndex;
		target.signalIndex = signalIndex;

		const SignalData* signal = m_dataSet.Resolve(target);
		const DataFile* file = m_dataSet.FileAt(fileIndex);
		if (signal == nullptr || file == nullptr)
		{
			return;
		}
		const std::wstring name = signal->Title();

		if (file->signals.size() <= 1)
		{
			// 组内只剩这一条信号：直接移除整个分组，避免在列表里留下一个空分组。
			RemoveFile(fileIndex);
			return;
		}

		// 先按旧下标修正各标签页配置与共享选中项，再从数据层移除（释放采样内存），最后对齐。
		for (TabConfig& tab : m_tabs)
		{
			tab.RemapAfterSignalRemoval(fileIndex, signalIndex);
		}
		m_dataSet.RemapSelectionAfterSignalRemoval(fileIndex, signalIndex);
		m_dataSet.RemoveSignal(fileIndex, signalIndex);
		SyncTabsToDataSet();

		SetStatusMessage(L"已从工作区移除信号：" + name, false);
	}

	void Application::Relayout()
	{
		RECT client = {};
		GetClientRect(m_hwnd, &client);
		const float width = static_cast<float>(client.right - client.left);
		const float height = static_cast<float>(client.bottom - client.top);
		if (width <= 1.0f || height <= 1.0f)
		{
			return;
		}

		const float tabBarHeight = m_tabBar.DesiredHeight();
		const float toolbarHeight = m_toolbar.DesiredHeight();
		const float splitterWidth = ScaleOf(kSplitterWidth, m_scale);

		m_tabBarRect = gd::RectF(0.0f, 0.0f, width, tabBarHeight);
		m_toolbarRect = gd::RectF(0.0f, m_tabBarRect.Y + m_tabBarRect.Height, width, toolbarHeight);

		// 不再保留底部状态栏，内容区一直延伸到窗口底部。
		const float contentTop = m_toolbarRect.Y + m_toolbarRect.Height;
		const float contentHeight = std::max(0.0f, height - contentTop);

		float panelWidth = ScaleOf(m_panelWidth, m_scale);
		const float maximum = std::min(ScaleOf(kMaxPanelWidth, m_scale), width * 0.45f);
		panelWidth = std::max(ScaleOf(kMinPanelWidth, m_scale), std::min(panelWidth, maximum));
		m_panelWidth = panelWidth / m_scale;

		m_panelRect = gd::RectF(0.0f, contentTop, panelWidth, contentHeight);
		m_splitterRect = gd::RectF(panelWidth, contentTop, splitterWidth, contentHeight);
		m_plotRect = gd::RectF(panelWidth + splitterWidth, contentTop,
		                       std::max(0.0f, width - panelWidth - splitterWidth), contentHeight);

		m_tabBar.Layout(m_tabBarRect);
		m_toolbar.Layout(m_toolbarRect);
		m_panel.SetClientBounds(gd::RectF(0.0f, 0.0f, width, height));
		m_panel.Layout(m_panelRect);
		m_plot.Layout(m_plotRect);

		// 所有控件的目标矩形都变了，装饰区域必须整体重绘一次。
		m_chromeDirty = true;
	}

	void Application::EnsureBackBuffer(int width, int height)
	{
		if (m_backDc != nullptr && width == m_backWidth && height == m_backHeight)
		{
			return;
		}

		ReleaseBackBuffer();

		// 新建的后备位图内容未定义，必须整帧重绘一次。
		m_chromeDirty = true;

		HDC screenDc = GetDC(m_hwnd);
		if (screenDc == nullptr)
		{
			return;
		}
		m_backDc = CreateCompatibleDC(screenDc);
		if (m_backDc != nullptr)
		{
			m_backBitmap = CreateCompatibleBitmap(screenDc, width, height);
			if (m_backBitmap != nullptr)
			{
				m_backOldBitmap = SelectObject(m_backDc, m_backBitmap);
				m_backWidth = width;
				m_backHeight = height;
			}
			else
			{
				DeleteDC(m_backDc);
				m_backDc = nullptr;
			}
		}
		ReleaseDC(m_hwnd, screenDc);
	}

	void Application::ReleaseBackBuffer()
	{
		if (m_backDc != nullptr)
		{
			if (m_backOldBitmap != nullptr)
			{
				SelectObject(m_backDc, m_backOldBitmap);
				m_backOldBitmap = nullptr;
			}
			DeleteDC(m_backDc);
			m_backDc = nullptr;
		}
		if (m_backBitmap != nullptr)
		{
			DeleteObject(m_backBitmap);
			m_backBitmap = nullptr;
		}
		m_backWidth = 0;
		m_backHeight = 0;
	}

	void Application::Render()
	{
		RECT client = {};
		GetClientRect(m_hwnd, &client);
		const int width = client.right - client.left;
		const int height = client.bottom - client.top;
		if (width <= 0 || height <= 0)
		{
			return;
		}

		EnsureBackBuffer(width, height);
		if (m_backDc == nullptr)
		{
			return;
		}

		// 面板内展开/收起自定义颜色面板等操作会改变面板所需高度。
		if (m_panel.TakeLayoutDirty())
		{
			Relayout();
		}

		// 任何交互（勾选、移动网格、切换标签页）之后都在此统一收敛视图状态。
		SynchronizeView(false);

		m_toolbar.SetDocumentLoaded(!m_dataSet.Empty());

		// 工具栏可切换按钮的选中状态始终与当前标签页配置保持一致。
		m_toolbar.SetToggleState(ToolbarAction::AUTO_FIT_Y, m_plot.AllLanesAutoFitToSelection());
		m_toolbar.SetToggleState(ToolbarAction::ZOOM_SELECT,
		                         m_plot.CurrentZoomMode() == PlotZoomMode::SELECT);
		m_toolbar.SetToggleState(ToolbarAction::CURSOR, m_plot.CursorEnabled());

		// 「光标」按钮文本随模式变化：常态=光标，单光标=光标x1，双光标=光标x2。
		// 文本变化会影响按钮宽度，因此需要重新排布一次。
		{
			const PlotCursorMode cursorMode = m_plot.CursorMode();
			const std::wstring cursorLabel = (cursorMode == PlotCursorMode::SINGLE) ? L"光标x1"
			                                 : (cursorMode == PlotCursorMode::DOUBLE) ? L"光标x2"
			                                                                         : L"光标";
			if (m_toolbar.SetActionLabel(ToolbarAction::CURSOR, cursorLabel))
			{
				Relayout();
			}
		}

		// 工具栏/标签栏/面板各自带悬停态，内容只在鼠标位于其中或发生交互时改变。
		// 绘图区内的拖拽（如双光标左右移动）期间这些区域完全静止，跳过其绘制，
		// 每帧省下约 6-8ms；弹出菜单 / 拾色器 / 加载遮罩会覆盖到装饰区域，必须整帧重绘。
		const bool overlaysVisible = m_menu.IsOpen() || m_colorPicker.IsOpen();
		const bool chromeDirty = m_chromeDirty || m_loading || overlaysVisible;
		m_chromeDirty = false;
		// 提示浮层淡出由定时器驱动，其绘制范围局限在绘图区，但为稳妥起见整帧回送。
		const bool fullFrame = chromeDirty || m_plot.HintNeedsAnimation();

		{
			gd::Graphics g(m_backDc);
			g.SetSmoothingMode(gd::SmoothingModeAntiAlias);
			g.SetPixelOffsetMode(gd::PixelOffsetModeHalf);
			g.SetTextRenderingHint(gd::TextRenderingHintClearTypeGridFit);

			if (chromeDirty)
			{
				UiFillRect(g, gd::RectF(0.0f, 0.0f, static_cast<float>(width), static_cast<float>(height)),
				           m_theme.windowBg);

				m_tabBar.Paint(g);
				m_toolbar.Paint(g);
				m_panel.Paint(g);
				UiFillRect(g, m_splitterRect, m_theme.border);
			}

			m_plot.Paint(g);

			// 弹出菜单与浮动拾色器始终绘制在最上层，保证与主界面风格一致。
			m_menu.Paint(g);
			m_colorPicker.Paint(g);

			// 加载遮罩层在一切内容之上（包括菜单与拾色器），形成模态观感。
			PaintLoadingOverlay(g, width, height);
		}

		HDC windowDc = GetDC(m_hwnd);
		if (windowDc != nullptr)
		{
			if (fullFrame)
			{
				BitBlt(windowDc, 0, 0, width, height, m_backDc, 0, 0, SRCCOPY);
			}
			else
			{
				// PlotView 会把自身绘制严格裁剪在 m_plotRect 内，因此只回送该矩形即可。
				const int px = static_cast<int>(std::floor(m_plotRect.X));
				const int py = static_cast<int>(std::floor(m_plotRect.Y));
				const int pw = static_cast<int>(std::ceil(m_plotRect.X + m_plotRect.Width)) - px;
				const int ph = static_cast<int>(std::ceil(m_plotRect.Y + m_plotRect.Height)) - py;
				BitBlt(windowDc, px, py, pw, ph, m_backDc, px, py, SRCCOPY);
			}
			ReleaseDC(m_hwnd, windowDc);
		}

		// 提示浮层需要停留后淡出：仅在其仍可见时保持定时重绘，淡出结束即停表。
		if (m_plot.HintNeedsAnimation())
		{
			if (m_hintTimerActive == false)
			{
				SetTimer(m_hwnd, kHintTimerId, kHintTimerPeriodMs, nullptr);
				m_hintTimerActive = true;
			}
		}
		else if (m_hintTimerActive)
		{
			KillTimer(m_hwnd, kHintTimerId);
			m_hintTimerActive = false;
		}
	}

	void Application::SetStatusMessage(const std::wstring& text, bool isError)
	{
		// 界面不再占用底部空间显示常驻提示；仅把真实错误以对话框形式反馈给用户。
		if (!isError || text.empty())
		{
			return;
		}
		MessageBoxW(m_hwnd, text.c_str(), kWindowTitle, MB_ICONWARNING | MB_OK);
	}

	void Application::UpdateWindowTitle()
	{
		// 标题栏只显示应用名称，不附带标签页、文件数量等无关信息。
		SetWindowTextW(m_hwnd, kWindowTitle);
	}

	void Application::OpenFileDialog()
	{
		// 允许一次选择多个文件，便于跨文件对比信号。
		std::vector<wchar_t> buffer(static_cast<std::size_t>(MAX_PATH) * 16, L'\0');

		OPENFILENAMEW dialog = {};
		dialog.lStructSize = sizeof(dialog);
		dialog.hwndOwner = m_hwnd;
		dialog.lpstrFilter = L"CSV 数据文件 (*.csv)\0*.csv\0文本数据文件 (*.txt)\0*.txt\0所有文件 (*.*)\0*.*\0\0";
		dialog.lpstrFile = buffer.data();
		dialog.nMaxFile = static_cast<DWORD>(buffer.size());
		dialog.lpstrTitle = L"打开仿真数据文件（可多选）";
		dialog.lpstrDefExt = L"csv";
		dialog.Flags = OFN_FILEMUSTEXIST | OFN_PATHMUSTEXIST | OFN_EXPLORER | OFN_NOCHANGEDIR |
		               OFN_ALLOWMULTISELECT;

		if (GetOpenFileNameW(&dialog) == FALSE)
		{
			return;
		}

		// 多选时首段为目录，其余为文件名；单选时整段即为完整路径。
		const std::wstring first(buffer.data());
		const wchar_t* cursor = buffer.data() + first.size() + 1;

		int loaded = 0;
		if (*cursor == L'\0')
		{
			if (LoadFile(first))
			{
				++loaded;
			}
		}
		else
		{
			while (*cursor != L'\0')
			{
				const std::wstring name(cursor);
				if (LoadFile(first + L"\\" + name))
				{
					++loaded;
				}
				cursor += name.size() + 1;
			}
		}

		if (loaded > 0)
		{
			SetStatusMessage(L"已加载 " + std::to_wstring(loaded) +
			                     L" 个文件，请在左侧勾选需要查看的信号。",
			                 false);
		}
	}

	bool Application::LoadFile(const std::wstring& path)
	{
		if (path.empty())
		{
			return false;
		}

		// 大文件在工作线程解析并构建，主线程播放加载过渡动画，界面不再整块卡住。
		DataFile file;
		std::wstring error;
		if (!LoadFileAsync(path, file, error))
		{
			if (!error.empty())
			{
				SetStatusMessage(L"解析失败：" + error, true);
			}
			InvalidateRect(m_hwnd, nullptr, FALSE);
			return false;
		}

		int fileIndex = -1;
		// 此处只做一次指针/缓冲移动，不拷贝任何采样数据，因此不会造成可见卡顿。
		if (!m_dataSet.AddDataFile(std::move(file), fileIndex))
		{
			SetStatusMessage(L"解析失败：数据为空。", true);
			InvalidateRect(m_hwnd, nullptr, FALSE);
			return false;
		}

		// 新文件的信号在全部标签页中默认均为未勾选状态，由用户自行决定查看内容。
		SyncTabsToDataSet();
		UpdateWindowTitle();

		const DataFile* loaded = m_dataSet.FileAt(fileIndex);
		if (loaded != nullptr)
		{
			std::wstring message = L"已加载 组" + std::to_wstring(fileIndex + 1) + L"｜" + loaded->Title() +
			                       L"（" + FormatCount(static_cast<unsigned long long>(loaded->time.size())) +
			                       L" 行采样，" + std::to_wstring(loaded->signals.size()) +
			                       L" 条信号，时间列：" + loaded->timeColumnName + L"）";
			if (!loaded->timeMonotonic)
			{
				message += L" 提示：时间列非单调递增，光标取值使用最近邻策略。";
			}
			SetStatusMessage(message, false);
		}
		return true;
	}

	bool Application::LoadFileAsync(const std::wstring& path, DataFile& file, std::wstring& error)
	{
		error.clear();

		AsyncLoadState state;
		const std::size_t paletteBase = m_dataSet.SignalCount();

		m_loading = true;
		m_loadingProgress = 0.0f;
		m_loadingBytesRead = 0;
		m_loadingTotalBytes = 0;
		const std::size_t slashPos = path.find_last_of(L"\\/");
		m_loadingText = (slashPos == std::wstring::npos) ? path : path.substr(slashPos + 1);

		std::thread worker(RunAsyncLoad, &state, path, paletteBase);

		// 主线程循环：抽送消息 + 刷新动画，直到后台完成或用户取消。
		while (!state.done.load(std::memory_order_acquire))
		{
			MSG message = {};
			while (PeekMessageW(&message, nullptr, 0, 0, PM_REMOVE))
			{
				if (message.message == WM_QUIT)
				{
					// 退出请求：让后台停下并重新投递 WM_QUIT，由主循环正常收尾。
					state.cancelled.store(true, std::memory_order_relaxed);
					PostQuitMessage(static_cast<int>(message.wParam));
					break;
				}
				// 加载期间屏蔽鼠标与其它按键，避免重入加载或误改数据；
				// 保留 Esc 作为取消入口。
				if (message.message >= WM_MOUSEFIRST && message.message <= WM_MOUSELAST)
				{
					continue;
				}
				if (message.message == WM_KEYDOWN && message.wParam == VK_ESCAPE)
				{
					state.cancelled.store(true, std::memory_order_relaxed);
					continue;
				}
				if (message.message >= WM_KEYFIRST && message.message <= WM_KEYLAST)
				{
					continue;
				}
				TranslateMessage(&message);
				DispatchMessageW(&message);
			}

			m_loadingProgress = state.progress.load(std::memory_order_relaxed);
			m_loadingBytesRead = state.bytesRead.load(std::memory_order_relaxed);
			m_loadingTotalBytes = state.totalBytes.load(std::memory_order_relaxed);
			InvalidateRect(m_hwnd, nullptr, FALSE);
			UpdateWindow(m_hwnd);
			Sleep(15);
		}

		m_loadingProgress = 1.0f;
		m_loadingBytesRead = m_loadingTotalBytes;
		worker.join();
		m_loading = false;

		if (state.cancelled.load(std::memory_order_relaxed))
		{
			// 用户主动取消：不弹错误框（与 Esc 取消缩放选区的静默语义一致）。
			InvalidateRect(m_hwnd, nullptr, TRUE);
			return false;
		}
		if (!state.ok)
		{
			error = state.error;
			return false;
		}

		file = std::move(state.file);
		return true;
	}

	void Application::PaintLoadingOverlay(gd::Graphics& g, int width, int height)
	{
		if (!m_loading)
		{
			return;
		}

		// 半透明遮罩压暗整个界面，形成明确的"正在加载"状态。
		UiFillRect(g, gd::RectF(0.0f, 0.0f, static_cast<float>(width), static_cast<float>(height)),
		           0x66000000u);

		const float cardWidth = std::min(420.0f * m_scale, static_cast<float>(width) - 40.0f * m_scale);
		const float cardHeight = 132.0f * m_scale;
		const gd::RectF card((static_cast<float>(width) - cardWidth) * 0.5f,
		                     (static_cast<float>(height) - cardHeight) * 0.5f, cardWidth, cardHeight);

		UiFillRoundRect(g, card, 8.0f * m_scale, m_theme.cardBg);
		UiDrawRoundRect(g, card, 8.0f * m_scale, m_theme.borderStrong, 1.0f);

		// 旋转弧线：用时间驱动的起始角度形成持续的加载动画。
		const float spinnerRadius = 11.0f * m_scale;
		const gd::RectF spinner(card.X + 26.0f * m_scale, card.Y + 30.0f * m_scale - spinnerRadius,
		                        spinnerRadius * 2.0f, spinnerRadius * 2.0f);
		m_loadingSpin += 12.0f;
		if (m_loadingSpin >= 360.0f)
		{
			m_loadingSpin -= 360.0f;
		}
		gd::Pen trackPen(ToGdiColor(m_theme.border), 3.0f * m_scale);
		gd::Pen spinPen(ToGdiColor(m_theme.accent), 3.0f * m_scale);
		g.DrawArc(&trackPen, spinner, 0.0f, 359.0f);
		g.DrawArc(&spinPen, spinner, m_loadingSpin, 110.0f);

		const float textLeft = card.X + 52.0f * m_scale;
		const float textWidth = cardWidth - 52.0f * m_scale - 20.0f * m_scale;

		UiText(g, L"正在加载数据…", m_fonts.uiBold,
		       gd::RectF(textLeft, card.Y + 18.0f * m_scale, textWidth, 22.0f * m_scale), m_theme.text,
		       TextAlign::LEFT);

		// 超长文件名用省略号截断，避免撑破卡片。
		const std::wstring nameText =
		    UiEllipsize(m_loadingText, m_fonts.uiSmall, textWidth);
		UiText(g, nameText, m_fonts.uiSmall,
		       gd::RectF(textLeft, card.Y + 42.0f * m_scale, textWidth, 20.0f * m_scale),
		       m_theme.textMuted, TextAlign::LEFT);

		// 进度条（复用样式区滑块以外的简单圆角矩形，填充宽度严格按比例）。
		const gd::RectF track(card.X + 26.0f * m_scale, card.Y + 76.0f * m_scale,
		                      cardWidth - 52.0f * m_scale, 8.0f * m_scale);
		UiFillRoundRect(g, track, track.Height * 0.5f, m_theme.pressed);
		float ratio = m_loadingProgress;
		ratio = std::max(0.0f, std::min(ratio, 1.0f));
		const float fillWidth = track.Width * ratio;
		if (fillWidth > 1.0f)
		{
			UiFillRoundRect(g, gd::RectF(track.X, track.Y, fillWidth, track.Height), track.Height * 0.5f,
			                m_theme.accent);
		}

		wchar_t buffer[64];
		swprintf(buffer, sizeof(buffer) / sizeof(buffer[0]), L"%.2f%%", ratio * 100.0);

		// 已读取 / 总大小：两者都只显示数字与自适应单位（GB / MB / KB），均保留两位小数；
		// 百分比同样是两位小数。总大小未知（如列重组阶段）时只显示百分比。
		{
			std::wstring statusText = buffer;
			if (m_loadingTotalBytes > 0)
			{
				statusText = FormatByteSize(m_loadingBytesRead) + L" / " +
				             FormatByteSize(m_loadingTotalBytes) + L"  " + buffer;
			}
			UiText(g, statusText, m_fonts.monoSmall,
			       gd::RectF(track.X, card.Y + 92.0f * m_scale, track.Width, 20.0f * m_scale),
			       m_theme.text, TextAlign::LEFT);
		}

		UiText(g, L"按 Esc 取消", m_fonts.uiSmall,
		       gd::RectF(track.X, card.Y + 92.0f * m_scale, track.Width, 20.0f * m_scale),
		       m_theme.textMuted, TextAlign::RIGHT);
	}

	void Application::LoadCommandLineFiles()
	{
		int argumentCount = 0;
		LPWSTR* arguments = CommandLineToArgvW(GetCommandLineW(), &argumentCount);
		if (arguments == nullptr)
		{
			return;
		}

		int loaded = 0;
		for (int index = 1; index < argumentCount; ++index)
		{
			const std::wstring argument = arguments[index];
			if (argument.empty() || argument[0] == L'-' || argument[0] == L'/')
			{
				continue;
			}
			if (LoadFile(argument))
			{
				++loaded;
			}
		}
		LocalFree(arguments);

		if (loaded > 0)
		{
			SetStatusMessage(L"已加载 " + std::to_wstring(loaded) +
			                     L" 个文件，请在左侧勾选需要查看的信号。",
			                 false);
		}
	}

	void Application::ExecuteToolbarAction(ToolbarAction action)
	{
		switch (action)
		{
		case ToolbarAction::OPEN_FILE:
			OpenFileDialog();
			break;
		case ToolbarAction::FIT_ALL:
			// 自适应同时回到初始状态：退出缩放模式并显示全部信号范围。
			m_plot.FitAll();
			SetStatusMessage(L"已恢复自适应视图。", false);
			break;
		case ToolbarAction::AUTO_FIT_Y:
		{
			// 与网格右键菜单中的「选区 Y 轴自适应（全局）」同一开关：
			// 打开后立即按当前视图自适应一次，之后每次时间轴选区放大都会自动匹配。
			const bool enable = !m_plot.AllLanesAutoFitToSelection();
			m_plot.SetAllLanesAutoFitToSelection(enable, true);
			SetStatusMessage(enable ? L"已开启选区 Y 轴自适应：时间轴选区放大后自动匹配各网格 Y 轴。"
			                        : L"已关闭选区 Y 轴自适应。",
			                false);
			break;
		}
		case ToolbarAction::ZOOM_SELECT:
			m_plot.ToggleZoomMode(PlotZoomMode::SELECT);
			break;
		case ToolbarAction::CURSOR:
			m_plot.CycleCursorMode();
			break;
		case ToolbarAction::MERGE_LANES:
			if (!m_dataSet.Empty())
			{
				ActiveTab().SetMode(LaneMode::MERGED);
				SetStatusMessage(L"已将当前标签页的全部可见信号合并到同一网格。", false);
			}
			break;
		case ToolbarAction::SPLIT_LANES:
			if (!m_dataSet.Empty())
			{
				ActiveTab().SetMode(LaneMode::PER_SIGNAL);
				SetStatusMessage(L"当前标签页已切换为「每信号一格」。", false);
			}
			break;
		case ToolbarAction::CLEAR_ALL:
			if (!m_dataSet.Empty())
			{
				ActiveTab().SetAllVisible(false);
				m_panel.InvalidateRows();
				SetStatusMessage(L"已清空当前标签页的全部网格。", false);
			}
			break;
		case ToolbarAction::NONE:
		default:
			break;
		}

		if (m_hwnd != nullptr)
		{
			InvalidateRect(m_hwnd, nullptr, TRUE);
		}
	}

	bool Application::HandleKeyDown(WPARAM key)
	{
		const bool control = (GetKeyState(VK_CONTROL) & 0x8000) != 0;

		if (control && key == L'O')
		{
			OpenFileDialog();
			return true;
		}
		if (control && key == L'T')
		{
			NewTab();
			return true;
		}
		if (control && key == L'W')
		{
			CloseTab(m_activeTab);
			return true;
		}
		if (control && key == VK_TAB)
		{
			if (m_tabs.size() > 1)
			{
				const bool backward = (GetKeyState(VK_SHIFT) & 0x8000) != 0;
				const int count = static_cast<int>(m_tabs.size());
				SetActiveTab((m_activeTab + (backward ? count - 1 : 1)) % count);
			}
			return true;
		}

		switch (key)
		{
		case VK_ESCAPE:
		{
			// Esc 的语义：
			// 1) 放弃当前正在进行的拖拽（典型场景：缩放的框选选区还没松开左键）；
			//    取消后不应用选区、视图范围保持不变；
			// 2) 同时退出全部缩放模式，使工具栏「时间轴选区」「Y 轴选区」回到未选中态。
			// Esc 不与时间光标关联：关闭光标请用工具栏「光标」按钮，避免误关指针。
			bool changed = m_plot.CancelDrag();
			changed = m_plot.ExitZoomModes() || changed;
			return changed;
		}
		case VK_ADD:
		case VK_OEM_PLUS:
			m_plot.ZoomTimeStep(1.4);
			return true;
		case VK_SUBTRACT:
		case VK_OEM_MINUS:
			m_plot.ZoomTimeStep(1.0 / 1.4);
			return true;
		case VK_LEFT:
			m_plot.PanTimeByFraction(-0.12);
			return true;
		case VK_RIGHT:
			m_plot.PanTimeByFraction(0.12);
			return true;
		case VK_UP:
			m_plot.ScrollLanesByFraction(-0.12);
			return true;
		case VK_DOWN:
			m_plot.ScrollLanesByFraction(0.12);
			return true;
		default:
			break;
		}

		if (key == L'F')
		{
			m_plot.FitAll();
			return true;
		}
		return false;
	}

	void Application::UpdateDragCursor(int x, int y)
	{
		// 鼠标捕获期间不再有 WM_SETCURSOR，只能自己按当前状态设置光标。
		HCURSOR cursor = nullptr;
		if (m_activeTarget == Target::PLOT)
		{
			cursor = m_plot.QueryCursor(x, y);
		}
		SetCursor(cursor != nullptr ? cursor : LoadCursorW(nullptr, IDC_ARROW));
	}

	bool Application::HandleMouseMove(int x, int y, bool buttonDown)
	{
		if (buttonDown && m_activeTarget != Target::NONE)
		{
			switch (m_activeTarget)
			{
			case Target::SPLITTER:
				if (m_draggingSplitter && m_scale > 0.0f)
				{
					const float desired = static_cast<float>(x - m_splitterGrabOffset) / m_scale;
					const float maximum =
					    std::min(kMaxPanelWidth, static_cast<float>(kMinClientWidth) / m_scale);
					m_panelWidth = std::max(kMinPanelWidth, std::min(desired, maximum));
					Relayout();
					return true;
				}
				return false;
			case Target::PLOT:
				return m_plot.OnMouseMove(x, y);
			case Target::PANEL:
				return m_panel.OnMouseMove(x, y);
			case Target::TOOLBAR:
				return m_toolbar.OnMouseMove(x, y);
			case Target::TAB_BAR:
				return m_tabBar.OnMouseMove(x, y);
			case Target::EDIT_FIELD:
			{
				// 输入框拖拽框选：按当前正在编辑的组件分发。
				bool changed = m_tabBar.OnEditMouseMove(x);
				changed = m_panel.OnEditMouseMove(x) || changed;
				changed = m_plot.OnEditMouseMove(x) || changed;
				changed = m_colorPicker.OnEditMouseMove(x) || changed;
				return changed;
			}
			case Target::NONE:
			default:
				return false;
			}
		}

		bool changed = false;
		changed =
		    (m_tabBar.HitTest(x, y) ? m_tabBar.OnMouseMove(x, y) : m_tabBar.OnMouseLeave()) || changed;
		changed =
		    (m_toolbar.HitTest(x, y) ? m_toolbar.OnMouseMove(x, y) : m_toolbar.OnMouseLeave()) || changed;
		changed = (m_panel.HitTest(x, y) ? m_panel.OnMouseMove(x, y) : m_panel.OnMouseLeave()) || changed;
		changed = (m_plot.HitTest(x, y) ? m_plot.OnMouseMove(x, y) : m_plot.OnMouseLeave()) || changed;
		return changed;
	}

	void Application::OnTabBarResult(const TabBarResult& result)
	{
		switch (result.type)
		{
		case TabBarResult::Type::ADD:
			NewTab();
			break;
		case TabBarResult::Type::SELECT:
			if (result.index != m_activeTab)
			{
				SetActiveTab(result.index);
			}
			break;
		case TabBarResult::Type::CLOSE:
			CloseTab(result.index);
			break;
		case TabBarResult::Type::CONTEXT:
			ShowTabContextMenu(result);
			break;
		case TabBarResult::Type::REORDER:
			MoveTab(result.index, result.targetIndex);
			break;
		case TabBarResult::Type::RENAME:
			if (result.index >= 0 && result.index < static_cast<int>(m_tabs.size()) && !result.text.empty())
			{
				m_tabs[static_cast<std::size_t>(result.index)].SetName(result.text);
				RefreshTabBar();
				// SetTabs 会重置各标签的矩形，必须重新布局才能把它们算回来。
				Relayout();
				InvalidateRect(m_hwnd, nullptr, TRUE);
			}
			break;
		case TabBarResult::Type::NONE:
		default:
			break;
		}
	}

	void Application::MoveTab(int from, int target)
	{
		if (from < 0 || from >= static_cast<int>(m_tabs.size()))
		{
			return;
		}
		if (target < 0 || target > static_cast<int>(m_tabs.size()))
		{
			return;
		}

		// 拖拽语义：target 表示「插入到该下标之前」；向后拖时需扣除自身占位。
		int destination = target;
		if (destination > from)
		{
			--destination;
		}
		destination = std::max(0, std::min(destination, static_cast<int>(m_tabs.size()) - 1));
		if (destination == from)
		{
			return;
		}

		// 保持当前激活的标签页在重排后仍处于激活状态。
		TabConfig moved = m_tabs[static_cast<std::size_t>(from)];
		const int activeIndex = m_activeTab;

		m_tabs.erase(m_tabs.begin() + from);
		m_tabs.insert(m_tabs.begin() + destination, std::move(moved));

		int newActive = activeIndex;
		if (activeIndex == from)
		{
			newActive = destination;
		}
		else if (from < activeIndex && destination >= activeIndex)
		{
			--newActive;
		}
		else if (from > activeIndex && destination <= activeIndex)
		{
			++newActive;
		}

		SetActiveTab(newActive);
		InvalidateRect(m_hwnd, nullptr, TRUE);
	}

	bool Application::ApplyPendingRename()
	{
		SignalRef ref;
		std::wstring name;
		if (!m_plot.TakePendingRename(ref, name))
		{
			return false;
		}

		if (!m_dataSet.SetSignalDisplayName(ref.fileIndex, ref.signalIndex, name))
		{
			return false;
		}

		// 改名只影响显示，但需要刷新左侧列表与绘图区图例。
		m_panel.InvalidateRows();
		SetStatusMessage(L"信号已重命名为：" + name, false);
		InvalidateRect(m_hwnd, nullptr, TRUE);
		return true;
	}

	bool Application::BuildDerivedSignal(const DerivedSignalRequest& request, bool makeVisible)
	{
		const DataFile* file = m_dataSet.FileAt(request.fileIndex);
		if (file == nullptr || request.signalIndex < 0 ||
		    request.signalIndex >= static_cast<int>(file->signals.size()))
		{
			return false;
		}
		const SignalData& source = file->signals[static_cast<std::size_t>(request.signalIndex)];
		const std::wstring baseName = source.Title();

		// 1. 计算派生采样值（与网格内的预览曲线共用同一实现，因此逐位一致）。
		//    多次迭代均值滤波形如「<原信号名称> (N点均值 M次迭代)」，
		//    弱波增强形如「<原信号名称> (弱波增强 M% N次迭代)」。
		std::vector<float> derived_values;
		SignalData derived;
		if (request.weakBoost)
		{
			ComputeWeakWaveBoost(source.values, static_cast<double>(request.levelPercent) / 100.0,
			                     request.iterations, derived_values);
			derived.name = baseName + L" (弱波增强 " + std::to_wstring(request.levelPercent) + L"% " +
			               std::to_wstring(request.iterations) + L"次迭代)";
		}
		else
		{
			ComputeMovingAverageIterated(source.values, request.points, request.iterations, derived_values);
			derived.name = baseName + L" (" + std::to_wstring(request.points) + L"点均值 " +
			               std::to_wstring(request.iterations) + L"次迭代)";
		}

		// 2. 组装新信号。
		derived.rawHeader = derived.name;
		derived.unit = source.unit;
		derived.values.assign(derived_values.begin(), derived_values.end());

		// 3. 插入到原信号的下方（数据层 + 各标签页引用重映射）。
		int newIndex = -1;
		if (!m_dataSet.InsertDerivedSignal(request.fileIndex, request.signalIndex, std::move(derived),
		                                   newIndex))
		{
			return false;
		}
		for (TabConfig& tab : m_tabs)
		{
			tab.RemapAfterSignalInsert(request.fileIndex, newIndex);
		}

		// 4. 在当前标签页中勾选新信号，并把它所在的网格移到原信号网格的下方。
		if (makeVisible && !m_tabs.empty())
		{
			SignalRef derivedRef;
			derivedRef.fileIndex = request.fileIndex;
			derivedRef.signalIndex = newIndex;
			ActiveTab().SetVisible(derivedRef, true);

			SignalRef sourceRef;
			sourceRef.fileIndex = request.fileIndex;
			sourceRef.signalIndex = request.signalIndex;
			ActiveTab().MoveLaneOfSignalBelow(derivedRef, sourceRef);
		}

		// 5. 数据层结构变化：刷新列表、作废折线/派生缓存并重绘。
		SyncTabsToDataSet();
		return true;
	}

	bool Application::ApplyPendingDerivedBuild()
	{
		// 两类「构建为新信号」请求（均值滤波 / 弱波增强）机制完全一致，
		// 统一整理成同一份构建清单后按下标降序处理。
		std::vector<DerivedSignalRequest> requests;
		{
			int laneIndex = -1;
			std::vector<PlotView::MeanFilterBuild> items;
			if (m_plot.TakePendingMeanFilterBuild(laneIndex, items))
			{
				for (const PlotView::MeanFilterBuild& item : items)
				{
					DerivedSignalRequest request;
					request.fileIndex = item.fileIndex;
					request.signalIndex = item.signalIndex;
					request.points = item.points;
					request.iterations = item.iterations;
					request.weakBoost = false;
					requests.push_back(request);
				}
			}
		}
		{
			int laneIndex = -1;
			std::vector<PlotView::WeakBoostBuild> items;
			if (m_plot.TakePendingWeakBoostBuild(laneIndex, items))
			{
				for (const PlotView::WeakBoostBuild& item : items)
				{
					DerivedSignalRequest request;
					request.fileIndex = item.fileIndex;
					request.signalIndex = item.signalIndex;
					request.levelPercent = item.levelPercent;
					request.iterations = item.iterations;
					request.weakBoost = true;
					requests.push_back(request);
				}
			}
		}
		if (requests.empty())
		{
			return false;
		}
		if (m_tabs.empty())
		{
			return false;
		}

		// **同一文件内必须按下标降序处理**：每次插入只让插入点之后的信号下标 +1，
		// 降序处理可保证尚未处理的信号下标始终有效（升序会把新插入的信号当成原信号）。
		std::sort(requests.begin(), requests.end(),
		          [](const DerivedSignalRequest& a, const DerivedSignalRequest& b)
		          {
			          if (a.fileIndex != b.fileIndex)
			          {
				          return a.fileIndex < b.fileIndex;
			          }
			          return a.signalIndex > b.signalIndex;
		          });

		int built = 0;
		DerivedSignalRequest last;
		for (const DerivedSignalRequest& request : requests)
		{
			if (BuildDerivedSignal(request, true))
			{
				++built;
				last = request;
			}
		}

		if (built > 0)
		{
			std::wstring text = L"已构建 " + std::to_wstring(built) + L" 条 ";
			if (last.weakBoost)
			{
				text += L"弱波增强 " + std::to_wstring(last.levelPercent) + L"% " +
				        std::to_wstring(last.iterations) + L"次迭代信号。";
			}
			else
			{
				text += std::to_wstring(last.points) + L"点均值 " +
				        std::to_wstring(last.iterations) + L"次迭代滤波信号。";
			}
			SetStatusMessage(text, false);
		}
		return built > 0;
	}

	void Application::ShowTabContextMenu(const TabBarResult& result)
	{
		if (result.index < 0 || result.index >= static_cast<int>(m_tabs.size()))
		{
			return;
		}

		m_tabMenuIndex = result.index;

		std::vector<MenuItem> items;

		MenuItem header;
		header.kind = MenuItemKind::HEADER;
		header.label = m_tabs[static_cast<std::size_t>(result.index)].Name();
		items.push_back(header);

		MenuItem create;
		create.label = L"新建标签页";
		create.id = kMenuTabNew;
		items.push_back(create);

		MenuItem close;
		close.label = L"关闭该标签页";
		close.id = kMenuTabClose;
		close.enabled = (m_tabs.size() > 1);
		items.push_back(close);

		MenuItem closeOthers;
		closeOthers.label = L"关闭其它标签页";
		closeOthers.id = kMenuTabCloseOthers;
		closeOthers.enabled = (m_tabs.size() > 1);
		items.push_back(closeOthers);

		// 菜单绘制在客户区内，因此把屏幕坐标换算为客户区坐标。
		POINT anchor = {result.screenX, result.screenY};
		ScreenToClient(m_hwnd, &anchor);

		RECT client = {};
		GetClientRect(m_hwnd, &client);
		const gd::RectF bounds(0.0f, 0.0f, static_cast<float>(client.right - client.left),
		                       static_cast<float>(client.bottom - client.top));

		m_menu.Open(MenuScope::TAB_BAR, bounds, anchor.x, anchor.y, items);
	}

	void Application::ShowPlotContextMenu(int laneIndex, int x, int y)
	{
		if (laneIndex < 0)
		{
			return;
		}

		m_plotMenuLane = laneIndex;

		std::vector<MenuItem> items;

		MenuItem header;
		header.kind = MenuItemKind::HEADER;
		header.label = L"网格 " + std::to_wstring(laneIndex + 1);
		items.push_back(header);

		// 当前网格的 Y 轴上下限值直接在菜单内的输入框里显示，单击即可就地编辑（菜单不关闭）。
		double laneYMin = 0.0;
		double laneYMax = 1.0;
		m_plot.LaneRange(laneIndex, laneYMin, laneYMax);

		MenuItem maxItem;
		maxItem.kind = MenuItemKind::EDIT;
		maxItem.label = L"Y 轴最大值";
		maxItem.id = PLOT_CMD_LANE_Y_MAX;
		maxItem.value = FormatValue(laneYMax);
		maxItem.filter = EditFilter::NUMBER;
		items.push_back(maxItem);

		MenuItem minItem;
		minItem.kind = MenuItemKind::EDIT;
		minItem.label = L"Y 轴最小值";
		minItem.id = PLOT_CMD_LANE_Y_MIN;
		minItem.value = FormatValue(laneYMin);
		minItem.filter = EditFilter::NUMBER;
		items.push_back(minItem);

		// 选区自适应（切换项）：勾选后每次本网格的时间轴选区放大都会自动匹配 Y 轴幅值。
		MenuItem autoViewItem;
		autoViewItem.label = L"选区 Y 轴自适应";
		autoViewItem.id = PLOT_CMD_LANE_AUTO_VIEW;
		autoViewItem.checked = m_plot.LaneAutoFitToSelection(laneIndex);
		items.push_back(autoViewItem);

		// 时间轴自适应到本网格信号范围（原先位于分隔线下方，现移到分隔线上方）。
		MenuItem fitLaneTime;
		fitLaneTime.label = L"按网格时间轴展开";
		fitLaneTime.id = PLOT_CMD_LANE_FIT_TIME;
		items.push_back(fitLaneTime);

		// 「拆分当前网格」：把该网格内的信号按个拆成独立网格，插到其下方依次排列。
		// 可点击时在后方追加「（N个信号）」说明将拆出的网格数；只有 1 条信号时置灰且不加尾缀。
		MenuItem splitLane;
		const std::size_t laneSignalCount = m_plot.LaneSignalCount(laneIndex);
		splitLane.label = (laneSignalCount > 1)
		                      ? (L"拆分当前网格（" + std::to_wstring(laneSignalCount) + L"个信号）")
		                      : L"拆分当前网格";
		splitLane.id = PLOT_CMD_LANE_SPLIT;
		splitLane.enabled = laneSignalCount > 1;
		items.push_back(splitLane);

		// 实验性功能（二级菜单）：横线上方，鼠标悬停即向右展开。
		MenuItem experimental;		experimental.kind = MenuItemKind::SUBMENU;
		experimental.label = L"实验性功能";
		{
			MenuItem edgeCount;
			edgeCount.label = L"边沿计数";
			edgeCount.id = PLOT_CMD_LANE_EDGE_COUNT;
			edgeCount.checked = m_plot.LaneEdgeCount(laneIndex);
			experimental.submenu.push_back(edgeCount);

			MenuItem edgeCenter;
			edgeCenter.label = L"边沿计数（中心轴）";
			edgeCenter.id = PLOT_CMD_LANE_EDGE_CENTER;
			edgeCenter.checked = m_plot.LaneEdgeCenterCount(laneIndex);
			experimental.submenu.push_back(edgeCenter);

			MenuItem meanFilter;
			meanFilter.label = L"均值滤波";
			meanFilter.id = PLOT_CMD_LANE_MEAN_FILTER;
			meanFilter.checked = m_plot.LaneMeanFilter(laneIndex);
			experimental.submenu.push_back(meanFilter);

			MenuItem weakBoost;
			weakBoost.label = L"弱波增强";
			weakBoost.id = PLOT_CMD_LANE_WEAK_BOOST;
			weakBoost.checked = m_plot.LaneWeakBoost(laneIndex);
			experimental.submenu.push_back(weakBoost);
		}
		items.push_back(experimental);

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

		// 全局开关：一次性打开/关闭全部网格各自的「选区 Y 轴自适应」。
		MenuItem autoFitAllItem;
		autoFitAllItem.label = L"选区 Y 轴自适应（全局）";
		autoFitAllItem.id = PLOT_CMD_AUTO_FIT_ALL;
		autoFitAllItem.checked = m_plot.AllLanesAutoFitToSelection();
		items.push_back(autoFitAllItem);

		MenuItem fitItem;
		fitItem.label = L"全部自适应";
		fitItem.id = PLOT_CMD_FIT_ALL;
		items.push_back(fitItem);

		RECT client = {};
		GetClientRect(m_hwnd, &client);
		const gd::RectF bounds(0.0f, 0.0f, static_cast<float>(client.right - client.left),
		                       static_cast<float>(client.bottom - client.top));

		m_menu.Open(MenuScope::PLOT_VIEW, bounds, x, y, items);
	}

	void Application::RefreshPlotMenuValues(int laneIndex)
	{
		if (laneIndex < 0)
		{
			return;
		}

		double laneYMin = 0.0;
		double laneYMax = 1.0;
		m_plot.LaneRange(laneIndex, laneYMin, laneYMax);
		m_menu.UpdateItemValue(PLOT_CMD_LANE_Y_MAX, FormatValue(laneYMax));
		m_menu.UpdateItemValue(PLOT_CMD_LANE_Y_MIN, FormatValue(laneYMin));

		// 「选区 Y 轴自适应」（本网格）与「（全局）」都是切换项，实时反映各自的勾选状态。
		m_menu.UpdateItemLabel(PLOT_CMD_LANE_AUTO_VIEW, L"选区 Y 轴自适应",
		                       m_plot.LaneAutoFitToSelection(laneIndex), true);
		m_menu.UpdateItemLabel(PLOT_CMD_AUTO_FIT_ALL, L"选区 Y 轴自适应（全局）",
		                       m_plot.AllLanesAutoFitToSelection(), true);
	}

	void Application::DispatchMenuResult(const MenuResult& result)
	{
		if (!result.valid)
		{
			return;
		}

		switch (result.scope)
		{
		case MenuScope::SIGNAL_PANEL:
		{
			const bool needRelayout = m_panel.OnMenuCommand(result);
			if (needRelayout)
			{
				Relayout();
			}
			InvalidateRect(m_hwnd, nullptr, FALSE);
			break;
		}
		case MenuScope::PLOT_VIEW:
		{
			// 菜单内联输入框的提交：就地更新网格 Y 轴上下限，菜单保持打开，
			// 并把夹取后的真实值回写到菜单上（输入值可能被合法区间修正）。
			if (result.editCommit)
			{
				const int laneIndex = m_plotMenuLane;
				if (laneIndex >= 0)
				{
					m_plot.ApplyLaneValueText(laneIndex, result.id == PLOT_CMD_LANE_Y_MAX, result.editText);
					RefreshPlotMenuValues(laneIndex);
				}
				SetFocus(m_hwnd);
				InvalidateRect(m_hwnd, nullptr, FALSE);
				break;
			}

			const int laneIndex = m_plotMenuLane;
			m_plotMenuLane = -1;
			switch (result.id)
			{
			case PLOT_CMD_LANE_AUTO_VIEW:
				// 切换本网格的「选区 Y 轴自适应」。
				m_plot.ToggleLaneAutoFitToSelection(laneIndex);
				break;
			case PLOT_CMD_AUTO_FIT_ALL:
			{
				// 全局切换：一次打开/关闭全部网格各自的开关；打开时立即生效一次。
				const bool enable = !m_plot.AllLanesAutoFitToSelection();
				m_plot.SetAllLanesAutoFitToSelection(enable, true);
				break;
			}
			case PLOT_CMD_LANE_FIT_TIME:
				// 「按网格时间轴展开」：展开时间轴后同时把该网格的 Y 轴自适应一次。
				m_plot.FitTimeToLane(laneIndex);
				break;
			case PLOT_CMD_LANE_EDGE_COUNT:
				// 「实验性功能 → 边沿计数」：切换本网格的横向光标与统计面板。
				m_plot.ToggleLaneEdgeCount(laneIndex);
				break;
			case PLOT_CMD_LANE_EDGE_CENTER:
				// 「实验性功能 → 边沿计数（中心轴）」：切换中心平均值曲线与统计面板。
				m_plot.ToggleLaneEdgeCenterCount(laneIndex);
				break;
			case PLOT_CMD_LANE_MEAN_FILTER:
				// 「实验性功能 → 均值滤波」：切换均值滤波曲线与参数面板。
				m_plot.ToggleLaneMeanFilter(laneIndex);
				break;
			case PLOT_CMD_LANE_WEAK_BOOST:
				// 「实验性功能 → 弱波增强」：切换弱波增强曲线与参数面板。
				m_plot.ToggleLaneWeakBoost(laneIndex);
				break;
			case PLOT_CMD_LANE_SPLIT:
				// 「拆分当前网格」：信号按个拆成独立网格，新网格顺次插入其下方。
				m_plot.SplitLane(laneIndex);
				break;
			case PLOT_CMD_FIT_ALL:
				m_plot.FitAll();
				break;
			default:
				break;
			}
			SetFocus(m_hwnd);
			InvalidateRect(m_hwnd, nullptr, TRUE);
			break;
		}
		case MenuScope::TAB_BAR:
		{
			const int index = m_tabMenuIndex;
			if (result.id == kMenuTabNew)
			{
				NewTab();
			}
			else if (result.id == kMenuTabClose)
			{
				CloseTab(index);
			}
			else if (result.id == kMenuTabCloseOthers)
			{
				if (index >= 0 && index < static_cast<int>(m_tabs.size()) && m_tabs.size() > 1)
				{
					const TabConfig keep = m_tabs[static_cast<std::size_t>(index)];
					m_tabs.clear();
					m_tabs.push_back(keep);
					SetActiveTab(0);
				}
			}
			m_tabMenuIndex = -1;
			InvalidateRect(m_hwnd, nullptr, TRUE);
			break;
		}
		case MenuScope::NONE:
		default:
			break;
		}
	}

	LRESULT Application::HandleMessage(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
	{
		// 除鼠标移动与鼠标移出（由下面的分支按“是否只影响绘图区”精确判断）之外，
		// 其余消息都可能改变标签栏 / 工具栏 / 面板的外观，统一标记装饰区域为脏。
		// WM_PAINT / WM_TIMER 的重绘范围由各自的处理分支判断，这里不做标记。
		if (message != WM_PAINT && message != WM_MOUSEMOVE && message != WM_MOUSELEAVE &&
		    message != WM_SETCURSOR && message != WM_NCHITTEST && message != WM_TIMER &&
		    message != WM_ERASEBKGND)
		{
			m_chromeDirty = true;
		}

		// 菜单打开时优先消费鼠标与键盘事件，形成模态交互。
		if (m_menu.IsOpen())
		{
			// 菜单接管输入后，取消底层组件可能仍在进行的拖拽。
			if (m_activeTarget != Target::NONE || m_draggingSplitter)
			{
				ReleaseCapture();
				m_activeTarget = Target::NONE;
				m_draggingSplitter = false;
				m_panel.OnLButtonUp(0, 0);
				m_plot.OnLButtonUp(0, 0);
			}

			switch (message)
			{
			case WM_MOUSEMOVE:
				// 菜单内联输入框拖拽框选优先（不改变悬停项，避免选区被中途清掉）。
				if (m_menu.IsEditing() && m_activeTarget == Target::EDIT_FIELD)
				{
					if (m_menu.OnEditMouseMove(GET_X_LPARAM(lParam)))
					{
						InvalidateRect(hwnd, nullptr, FALSE);
					}
					return 0;
				}
				if (m_menu.OnMouseMove(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			case WM_LBUTTONDOWN:
			{
				const int downX = GET_X_LPARAM(lParam);
				const int downY = GET_Y_LPARAM(lParam);

				// 点击菜单内联输入框：定位插入符并开始拖拽框选（与常规输入框一致）。
				if (m_menu.IsOnEditField(downX, downY))
				{
					m_menu.OnEditMouseDown(downX, downY);
					SetCapture(hwnd);
					m_activeTarget = Target::EDIT_FIELD;
					InvalidateRect(hwnd, nullptr, FALSE);
					return 0;
				}

				MenuResult result;
				m_menu.OnLButtonDown(downX, downY, result);
				InvalidateRect(hwnd, nullptr, FALSE);
				// 点击其它位置会先提交正在编辑的数值，需要立即落到数据层并刷新菜单显示。
				if (result.valid)
				{
					DispatchMenuResult(result);
				}
				return 0;
			}
			case WM_LBUTTONUP:
			{
				if (m_menu.IsEditing() && m_activeTarget == Target::EDIT_FIELD)
				{
					ReleaseCapture();
					m_activeTarget = Target::NONE;
					m_menu.OnEditMouseUp();
					InvalidateRect(hwnd, nullptr, FALSE);
					return 0;
				}

				MenuResult result;
				m_menu.OnLButtonUp(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam), result);
				InvalidateRect(hwnd, nullptr, FALSE);
				DispatchMenuResult(result);
				return 0;
			}
			case WM_CHAR:
			{
				// 菜单内联输入框的字符输入（数值/名称），回车在此提交。
				MenuResult result;
				if (m_menu.OnChar(static_cast<wchar_t>(wParam), result))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				if (result.valid)
				{
					DispatchMenuResult(result);
				}
				return 0;
			}
			case WM_RBUTTONDOWN:
			case WM_MBUTTONDOWN:
			case WM_MOUSEWHEEL:
				m_menu.Close();
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			case WM_KEYDOWN:
			{
				MenuResult result;
				m_menu.OnKeyDown(wParam, result);
				InvalidateRect(hwnd, nullptr, FALSE);
				if (result.valid)
				{
					DispatchMenuResult(result);
				}
				return 0;
			}
			case WM_KILLFOCUS:
			case WM_CANCELMODE:
				m_menu.Close();
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			case WM_SETCURSOR:
				SetCursor(LoadCursorW(nullptr, IDC_ARROW));
				return TRUE;
			default:
				break;
			}
		}

		// 拾色器打开时接管鼠标与键盘（优先级低于弹出菜单、高于常规组件）。
		if (m_colorPicker.IsOpen())
		{
			bool repaint = false;
			bool consume = false;

			switch (message)
			{
			case WM_MOUSEMOVE:
				repaint = m_colorPicker.OnMouseMove(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
				consume = true;
				break;
			case WM_LBUTTONDOWN:
			{
				const int pickX = GET_X_LPARAM(lParam);
				const int pickY = GET_Y_LPARAM(lParam);

				// 拾色器接管输入后，取消底层组件可能仍在进行的拖拽。
				m_panel.OnLButtonUp(0, 0);
				m_plot.OnLButtonUp(0, 0);
				m_activeTarget = Target::NONE;
				m_draggingSplitter = false;

				if (m_colorPicker.ContainsPoint(pickX, pickY))
				{
					// 面板内部：开始拖动滑块，并吃掉本次点击，避免穿透到下方图层。
					m_colorPicker.OnLButtonDown(pickX, pickY);
					SetCapture(hwnd);
					consume = true;
				}
				else
				{
					// 面板外部：收起面板；若落点在信号面板内则放行本次点击，
					// 便于用户在展开状态下直接改选预设色、样式或拖动滑块。
					m_colorPicker.Close();
					if (!m_panel.HitTest(pickX, pickY))
					{
						InvalidateRect(hwnd, nullptr, FALSE);
						return 0;
					}
				}
				repaint = true;
				break;
			}
			case WM_SETCURSOR:
			{
				if (LOWORD(lParam) == HTCLIENT)
				{
					POINT point = {};
					GetCursorPos(&point);
					ScreenToClient(hwnd, &point);

					HCURSOR cursor = m_colorPicker.QueryCursor(point.x, point.y);
					SetCursor(cursor != nullptr ? cursor : LoadCursorW(nullptr, IDC_ARROW));
					return TRUE;
				}
				break;
			}
			case WM_LBUTTONUP:
				m_colorPicker.OnLButtonUp();
				ReleaseCapture();
				repaint = true;
				consume = true;
				break;
			case WM_KEYDOWN:
				m_colorPicker.OnKeyDown(wParam);
				repaint = true;
				consume = true;
				break;
			case WM_CHAR:
				// 字符输入转发给拾色器，用于 RGB 分量与十六进制色号的内联编辑。
				repaint = m_colorPicker.OnChar(static_cast<wchar_t>(wParam));
				consume = true;
				break;
			case WM_RBUTTONDOWN:
			case WM_MBUTTONDOWN:
			case WM_MOUSEWHEEL:
				m_colorPicker.Close();
				repaint = true;
				consume = true;
				break;
			default:
				break;
			}

			// 取色变化实时应用到当前选中信号。
			std::uint32_t pickedColor = 0;
			if (m_colorPicker.TakeChanged(pickedColor))
			{
				m_panel.ApplyColor(pickedColor);
				repaint = true;
			}

			if (repaint)
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
			if (consume)
			{
				return 0;
			}
		}

		switch (message)
		{
		case WM_SIZE:
		{
			ReleaseBackBuffer();
			Relayout();
			InvalidateRect(hwnd, nullptr, FALSE);
			return 0;
		}
		case WM_GETMINMAXINFO:
		{
			MINMAXINFO* info = reinterpret_cast<MINMAXINFO*>(lParam);
			info->ptMinTrackSize.x = static_cast<LONG>(ScaleOf(static_cast<float>(kMinClientWidth), m_scale));
			info->ptMinTrackSize.y = static_cast<LONG>(ScaleOf(static_cast<float>(kMinClientHeight), m_scale));
			return 0;
		}
		case WM_DPICHANGED:
		{
			const UINT dpi = HIWORD(wParam);
			const RECT* suggested = reinterpret_cast<const RECT*>(lParam);
			if (suggested != nullptr)
			{
				SetWindowPos(hwnd, nullptr, suggested->left, suggested->top,
				             suggested->right - suggested->left, suggested->bottom - suggested->top,
				             SWP_NOZORDER | SWP_NOACTIVATE);
			}
			ApplyDpi(dpi);
			InvalidateRect(hwnd, nullptr, FALSE);
			return 0;
		}
		case WM_ERASEBKGND:
			return 1;
		case WM_PAINT:
		{
			// BeginPaint 会清空更新区域，因此必须先取出本次待重绘的范围：
			// 只有完全落在绘图区内的更新区域才允许走“局部回送”的快路径，
			// 其余情况（窗口首次显示、其它窗口遮挡后露出、DPI 变化等）必须整帧重绘。
			RECT update = {};
			const bool hasUpdate = GetUpdateRect(hwnd, &update, FALSE) != FALSE;
			if (hasUpdate)
			{
				const bool insidePlot =
				    update.left >= static_cast<LONG>(std::floor(m_plotRect.X)) &&
				    update.top >= static_cast<LONG>(std::floor(m_plotRect.Y)) &&
				    update.right <= static_cast<LONG>(std::ceil(m_plotRect.X + m_plotRect.Width)) &&
				    update.bottom <= static_cast<LONG>(std::ceil(m_plotRect.Y + m_plotRect.Height)) &&
				    update.right > update.left && update.bottom > update.top;
				if (!insidePlot)
				{
					m_chromeDirty = true;
				}
			}

			PAINTSTRUCT paintStruct = {};
			BeginPaint(hwnd, &paintStruct);
			Render();
			EndPaint(hwnd, &paintStruct);
			return 0;
		}
		case WM_MOUSEMOVE:
		{
			if (!m_trackingLeave)
			{
				TRACKMOUSEEVENT track = {};
				track.cbSize = sizeof(track);
				track.dwFlags = TME_LEAVE;
				track.hwndTrack = hwnd;
				TrackMouseEvent(&track);
				m_trackingLeave = true;
			}

			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);
			const bool buttonDown = (wParam & (MK_LBUTTON | MK_RBUTTON | MK_MBUTTON)) != 0;

			// 仅当本次移动不会影响绘图区之外的区域时，才跳过装饰区域的重绘：
			// 正在拖拽绘图区（鼠标可能被捕获到绘图区外），或鼠标始终停留在绘图区内。
			const bool inPlot = UiPointInRect(m_plotRect, static_cast<float>(x), static_cast<float>(y));
			const bool plotOnlyMove = (m_activeTarget == Target::PLOT) || (inPlot && m_mouseOverPlot);
			if (!plotOnlyMove)
			{
				m_chromeDirty = true;
			}
			m_mouseOverPlot = inPlot;

			if (HandleMouseMove(x, y, buttonDown))
			{
				if (plotOnlyMove && !m_chromeDirty)
				{
					// 只失效绘图区，配合 WM_PAINT 中的判断即可走局部回送快路径。
					InvalidatePlotRect(hwnd, m_plotRect);
				}
				else
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
			}
			// 拖动（鼠标捕获）期间 Windows 不会派发 WM_SETCURSOR，
			// 因此需要主动刷新一次，否则光标形状会一直停在按下的状态。
			if (buttonDown)
			{
				UpdateDragCursor(x, y);
			}
			return 0;
		}
		case WM_MOUSELEAVE:
		{
			m_trackingLeave = false;
			// 只有标签栏 / 工具栏 / 面板的悬停态变化才需要重绘装饰区域；
			// 绘图区自身的悬停态变化（提示浮层、信号光晕）只需重绘绘图区，
			// 这样拖拽光标时鼠标短暂移出窗口也不会退化成整帧重绘。
			bool chromeChanged = m_tabBar.OnMouseLeave();
			chromeChanged = m_toolbar.OnMouseLeave() || chromeChanged;
			chromeChanged = m_panel.OnMouseLeave() || chromeChanged;
			const bool plotChanged = m_plot.OnMouseLeave();
			m_mouseOverPlot = false;

			if (chromeChanged)
			{
				m_chromeDirty = true;
			}

			if (plotChanged && !chromeChanged && !m_chromeDirty)
			{
				InvalidatePlotRect(hwnd, m_plotRect);
			}
			else if (chromeChanged || plotChanged)
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
			return 0;
		}
		case WM_LBUTTONDOWN:
		{
			SetFocus(hwnd);
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);

			// 编辑态下点击输入框内部：定位插入符并开始拖拽框选，不再触发底层控件的选中/拖拽。
			if (m_tabBar.OnEditMouseDown(x, y) || m_panel.OnEditMouseDown(x, y) ||
			    m_plot.OnEditMouseDown(x, y) || m_colorPicker.OnEditMouseDown(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::EDIT_FIELD;
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}

			// 标签栏重命名处于编辑态时，点击输入框之外的**任何**位置都提交并退出编辑态。
			// （面板与绘图区的输入框会在各自的 OnLButtonDown 内部提交，但点击它们之外
			//   的区域时宿主根本不会把消息转给标签栏，重命名输入框会一直停留在编辑态。）
			if (m_tabBar.IsEditing())
			{
				TabBarResult renameResult;
				m_tabBar.OnEditKey(VK_RETURN, renameResult);
				OnTabBarResult(renameResult);
				InvalidateRect(hwnd, nullptr, FALSE);
			}

			// 内联数值输入处于活动态时，点击绘图区之外视为提交（与线宽输入一致）。
			if (m_plot.IsEditing() && !m_plot.HitTest(x, y))
			{
				m_plot.OnEditKey(VK_RETURN);
				ApplyPendingRename();
			}

			// 点击面板之外的位置时收起面板内展开的自定义颜色面板。
			if (!m_panel.HitTest(x, y))
			{
				if (m_panel.CloseTransientUi())
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
			}

			if (UiPointInRect(m_splitterRect, static_cast<float>(x), static_cast<float>(y)))
			{
				SetCapture(hwnd);
				m_draggingSplitter = true;
				m_activeTarget = Target::SPLITTER;
				m_splitterGrabOffset = x - static_cast<int>(m_splitterRect.X);
				return 0;
			}

			if (m_tabBar.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::TAB_BAR;
				m_tabBar.OnLButtonDown(x, y);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}

			if (m_toolbar.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::TOOLBAR;
				ToolbarAction action = ToolbarAction::NONE;
				m_toolbar.OnLButtonDown(x, y, action);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}

			if (m_panel.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::PANEL;
				if (m_panel.OnLButtonDown(x, y))
				{
					InvalidateRect(hwnd, nullptr, TRUE);
				}
				return 0;
			}

			if (m_plot.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::PLOT;
				if (m_plot.OnLButtonDown(x, y))
				{
					// 绘图区内的点击也可能提交图例改名，需要立刻落到数据层。
					ApplyPendingRename();
					// 「构建为新信号」按钮（均值滤波 / 弱波增强）：立即构建新信号并同步各视图。
					ApplyPendingDerivedBuild();
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				// 拖动期间 Windows 不再派发 WM_SETCURSOR，需在按下后立即刷新一次，
				// 使"按下但尚未拖动"时能立刻看到十字/方向箭头提示。
				UpdateDragCursor(x, y);
				return 0;
			}

			m_activeTarget = Target::NONE;
			return 0;
		}
		case WM_LBUTTONUP:
		{
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);
			ReleaseCapture();

			switch (m_activeTarget)
			{
			case Target::SPLITTER:
				m_draggingSplitter = false;
				break;
			case Target::EDIT_FIELD:
			{
				// 结束输入框内的拖拽框选（选区保留）。
				bool changed = m_tabBar.OnEditMouseUp();
				changed = m_panel.OnEditMouseUp(x, y) || changed;
				changed = m_plot.OnEditMouseUp() || changed;
				changed = m_colorPicker.OnEditMouseUp() || changed;
				m_activeTarget = Target::NONE;
				if (changed)
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			case Target::TAB_BAR:
			{
				TabBarResult result;
				m_tabBar.OnLButtonUp(x, y, result);
				m_activeTarget = Target::NONE;
				OnTabBarResult(result);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}
			case Target::TOOLBAR:
			{
				ToolbarAction action = ToolbarAction::NONE;
				m_toolbar.OnLButtonUp(x, y, action);
				m_activeTarget = Target::NONE;
				if (action != ToolbarAction::NONE)
				{
					ExecuteToolbarAction(action);
					return 0;
				}
				break;
			}
			case Target::PANEL:
				m_panel.OnLButtonUp(x, y);
				break;
			case Target::PLOT:
				m_plot.OnLButtonUp(x, y);
				break;
			case Target::NONE:
			default:
				break;
			}

			m_activeTarget = Target::NONE;
			InvalidateRect(hwnd, nullptr, TRUE);
			return 0;
		}
		case WM_MBUTTONDOWN:
		{
			// 鼠标中键：在绘图区内按下即进入自由平移（任何缩放模式下都可用）。
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);
			if (m_plot.IsEditing())
			{
				// 内联输入中：中键视为提交（与左键点外一致）。
				m_plot.OnEditKey(VK_RETURN);
				ApplyPendingRename();
			}
			if (m_plot.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_middlePanning = true;
				m_activeTarget = Target::PLOT;
				if (m_plot.OnMButtonDown(x, y))
				{
					ApplyPendingRename();
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				UpdateDragCursor(x, y);
			}
			return 0;
		}
		case WM_MBUTTONUP:
		{
			if (m_middlePanning)
			{
				m_middlePanning = false;
				m_plot.OnMButtonUp();
				ReleaseCapture();
				m_activeTarget = Target::NONE;
				UpdateDragCursor(GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam));
				InvalidateRect(hwnd, nullptr, TRUE);
			}
			return 0;
		}
		case WM_LBUTTONDBLCLK:
		{
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);
			bool changed = false;
			if (m_tabBar.HitTest(x, y))
			{
				SetFocus(hwnd);
				changed = m_tabBar.OnDoubleClick(x, y);
				if (m_tabBar.IsEditing())
				{
					// 进入重命名后该标签会加宽，需要重新排布标签栏。
					Relayout();
				}
			}
			else if (m_panel.HitTest(x, y))
			{
				changed = m_panel.OnDoubleClick(x, y);
			}
			else if (m_plot.HitTest(x, y))
			{
				changed = m_plot.OnDoubleClick(x, y);
			}
			if (changed)
			{
				InvalidateRect(hwnd, nullptr, TRUE);
			}
			return 0;
		}
		case WM_RBUTTONDOWN:
		{
			const int x = GET_X_LPARAM(lParam);
			const int y = GET_Y_LPARAM(lParam);

			// 「选区放大」正在框选时右键 = 放弃当前选区（显示提示），
			// 与 Esc 不同：这里**不退出**选区放大模式，也不弹出网格菜单。
			// 左键仍按着，因此保留鼠标捕获与激活目标，松手时不会命中被放弃的选区。
			if (m_plot.IsRubberSelecting())
			{
				m_plot.CancelDrag(true);
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}

			// 编辑态下右键 = 取消选区并把插入符移到文本末尾（常规输入框行为），
			// 其它操作（弹菜单、拖拽）一并被吞掉。
			if (m_tabBar.IsEditing() || m_panel.IsEditing() || m_plot.IsEditing() || m_colorPicker.IsEditing())
			{
				bool changed = m_tabBar.CollapseEditSelectionToEnd();
				changed = m_panel.CollapseEditSelectionToEnd() || changed;
				changed = m_plot.CollapseEditSelectionToEnd() || changed;
				changed = m_colorPicker.CollapseEditSelectionToEnd() || changed;
				if (changed)
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}

			POINT cursor = {x, y};
			ClientToScreen(hwnd, &cursor);

			if (m_tabBar.HitTest(x, y))
			{
				TabBarResult result;
				if (m_tabBar.OnRButtonDown(x, y, cursor.x, cursor.y, result))
				{
					OnTabBarResult(result);
					// 自绘菜单会覆盖在客户区之上，必须请求重绘才能显示。
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}

			if (m_panel.HitTest(x, y))
			{
				SetCapture(hwnd);
				m_activeTarget = Target::PANEL;
				if (m_panel.OnRButtonDown(x, y))
				{
					InvalidateRect(hwnd, nullptr, TRUE);
				}
				ReleaseCapture();
				m_activeTarget = Target::NONE;
				return 0;
			}

			// 绘图区右键：弹出该网格的 Y 轴设置菜单（含上下限输入）。
			if (m_plot.HitTest(x, y))
			{
				const int laneIndex = m_plot.LaneIndexAt(x, y);
				if (laneIndex >= 0)
				{
					// 菜单打开后鼠标移动被菜单独占，绘图区不再收到移动事件；
					// 若不先清掉悬停状态，右键前停留在曲线上的「可拖拽光晕」与提示气泡
					// 会一直挂在原地（用户报告的"进入网格菜单后高亮/文本提示不消失"）。
					m_plot.OnMouseLeave();
					ShowPlotContextMenu(laneIndex, x, y);
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			return 0;
		}
		case WM_RBUTTONUP:
		{
			// 左键仍按着时不释放捕获与激活目标（例如框选过程中右键放弃选区后再松开左键）。
			if ((wParam & MK_LBUTTON) == 0)
			{
				ReleaseCapture();
				m_activeTarget = Target::NONE;
			}
			return 0;
		}
		case WM_MOUSEWHEEL:
		{
			POINT point = {GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam)};
			ScreenToClient(hwnd, &point);

			const int delta = GET_WHEEL_DELTA_WPARAM(wParam);
			const bool shift = (GET_KEYSTATE_WPARAM(wParam) & MK_SHIFT) != 0;

			bool changed = false;
			if (m_panel.HitTest(point.x, point.y))
			{
				changed = m_panel.OnMouseWheel(delta);
			}
			else if (m_plot.HitTest(point.x, point.y))
			{
				changed = m_plot.OnMouseWheel(delta, shift);
			}
			if (changed)
			{
				InvalidateRect(hwnd, nullptr, FALSE);
			}
			return 0;
		}
		case WM_SETCURSOR:
		{
			if (LOWORD(lParam) == HTCLIENT)
			{
				POINT point = {};
				GetCursorPos(&point);
				ScreenToClient(hwnd, &point);

				HCURSOR cursor = nullptr;
				if (UiPointInRect(m_splitterRect, static_cast<float>(point.x), static_cast<float>(point.y)))
				{
					cursor = LoadCursorW(nullptr, IDC_SIZEWE);
				}
				else if (m_plot.HitTest(point.x, point.y))
				{
					cursor = m_plot.QueryCursor(point.x, point.y);
				}
				else if (UiPointInRect(m_panelRect, static_cast<float>(point.x), static_cast<float>(point.y)))
				{
					cursor = m_panel.QueryCursor(point.x, point.y);
				}
				if (cursor == nullptr)
				{
					cursor = LoadCursorW(nullptr, IDC_ARROW);
				}
				SetCursor(cursor);
				return TRUE;
			}
			break;
		}
		case WM_KEYDOWN:
			// 标签栏重命名与数值输入优先接管按键（回车提交、Esc 取消、退格删除）。
			if (m_tabBar.IsEditing())
			{
				TabBarResult tabResult;
				m_tabBar.OnEditKey(wParam, tabResult);
				OnTabBarResult(tabResult);
				if (!m_tabBar.IsEditing())
				{
					// 退出重命名后标签宽度恢复，需要重新排布。
					Relayout();
				}
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}
			if (m_panel.IsEditing())
			{
				if (m_panel.OnEditKey(wParam))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			if (m_plot.IsEditing())
			{
				m_plot.OnEditKey(wParam);
				ApplyPendingRename();
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}
			if (HandleKeyDown(wParam))
			{
				InvalidateRect(hwnd, nullptr, TRUE);
				return 0;
			}
			break;
		case WM_CHAR:
		{
			// 输入状态由对应控件自行校验可接受的字符（数值仅收数字与小数点，名称可收任意可打印字符）。
			if (m_tabBar.IsEditing())
			{
				if (m_tabBar.OnEditChar(static_cast<wchar_t>(wParam)))
				{
					// 标签宽度随输入内容增长（重命名时上限更宽），需重新排布才能看到完整名称。
					if (m_tabBar.IsEditing())
					{
						Relayout();
					}
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			if (m_panel.IsEditing())
			{
				if (m_panel.OnEditChar(static_cast<wchar_t>(wParam)))
				{
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			if (m_plot.IsEditing())
			{
				if (m_plot.OnEditChar(static_cast<wchar_t>(wParam)))
				{
					ApplyPendingRename();
					InvalidateRect(hwnd, nullptr, FALSE);
				}
				return 0;
			}
			break;
		}
		case WM_KILLFOCUS:
			// 失焦时提交输入并收起临时界面，避免失去鼠标前景后控件仍处于编辑态。
			m_panel.CloseTransientUi();
			m_colorPicker.Close();
			m_menu.Close();
			InvalidateRect(hwnd, nullptr, FALSE);
			return 0;
		case kMessageRemoveFile:
		{
			RemoveFile(static_cast<int>(wParam));
			return 0;
		}
		case kMessageRemoveSignal:
		{
			// wParam = 文件下标，lParam = 文件内信号下标。
			RemoveSignal(static_cast<int>(wParam), static_cast<int>(static_cast<LONG_PTR>(lParam)));
			return 0;
		}
		case WM_TIMER:
		{
			// 提示浮层淡出：仅重绘，不再做其它处理；Render 会在淡出结束后停表。
			if (wParam == kHintTimerId)
			{
				InvalidateRect(hwnd, nullptr, FALSE);
				return 0;
			}
			break;
		}
		case WM_DROPFILES:
		{
			HDROP drop = reinterpret_cast<HDROP>(wParam);
			const UINT count = DragQueryFileW(drop, 0xFFFFFFFF, nullptr, 0);
			int loaded = 0;
			for (UINT index = 0; index < count; ++index)
			{
				const UINT length = DragQueryFileW(drop, index, nullptr, 0);
				if (length == 0)
				{
					continue;
				}
				std::vector<wchar_t> buffer(static_cast<std::size_t>(length) + 1, L'\0');
				if (DragQueryFileW(drop, index, buffer.data(), length + 1) > 0)
				{
					if (LoadFile(std::wstring(buffer.data())))
					{
						++loaded;
					}
				}
			}
			DragFinish(drop);

			if (loaded > 0)
			{
				SetStatusMessage(L"已加载 " + std::to_wstring(loaded) +
				                     L" 个文件，请在左侧勾选需要查看的信号。",
				                 false);
			}
			return 0;
		}
		case WM_DESTROY:
			PostQuitMessage(0);
			return 0;
		default:
			break;
		}

		return DefWindowProcW(hwnd, message, wParam, lParam);
	}

} // namespace jdi