Just-DataInspector/Components/Application/Src/ApplicationLoading.cpp

// Application 实现分片 —— 本文件只包含 Application 的**成员函数定义**（纯代码搬移，行为与拆分前完全一致）。
//
// 共用的常量与自由函数在 ApplicationInternal.hpp（命名空间 `appdetail`，全部 inline）。
// 分片按“职责”划分：核心（状态/布局/几何）、渲染、交互与编辑，见各文件名。
#include "ApplicationInternal.hpp"

namespace jdi
{

	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。
		std::vector<SignalGroup> loaded;
		std::wstring error;
		if (!LoadFileAsync(path, loaded, error))
		{
			if (!error.empty())
			{
				SetStatusMessage(L"解析失败：" + error, true);
			}
			InvalidateRect(m_hwnd, nullptr, FALSE);
			return false;
		}
		if (loaded.empty())
		{
			SetStatusMessage(L"解析失败：数据为空。", true);
			InvalidateRect(m_hwnd, nullptr, FALSE);
			return false;
		}

		// 插入新分组会移动 SignalGroup/SignalData 的存储位置，必须先暂停后台派生曲线计算，
		// 否则后台线程可能正在读取即将被移动的采样数据。
		m_plot.PauseDerivedAsync();
		int lastGroupIndex = -1;
		for (SignalGroup& group : loaded)
		{
			int groupIndex = -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.AddGroup(std::move(group), groupIndex))
			{
				continue;
			}
			lastGroupIndex = groupIndex;
		}
		if (lastGroupIndex < 0)
		{
			SetStatusMessage(L"解析失败：数据为空。", true);
			InvalidateRect(m_hwnd, nullptr, FALSE);
			return false;
		}

		// 新分组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 SignalGroup* loadedGroup = m_dataSet.GroupAt(lastGroupIndex);
		if (loadedGroup != nullptr)
		{
			// 行数取各时间轴的**最大值**（多时间轴文件的各轴长度可能不同）。
			std::size_t rowCount = 0;
			bool anyNonMonotonic = false;
			std::wstring timeNames;
			for (const TimeAxis& axis : loadedGroup->axes)
			{
				rowCount = std::max(rowCount, axis.Count());
				anyNonMonotonic = anyNonMonotonic || !axis.monotonic;
				if (!timeNames.empty())
				{
					timeNames += L"、";
				}
				timeNames += axis.name;
			}
			std::wstring message =
			    L"已加载 组" + std::to_wstring(lastGroupIndex + 1) + L"｜" + loadedGroup->name +
			    L"（" + FormatCount(static_cast<unsigned long long>(rowCount)) + L" 行采样，" +
			    std::to_wstring(loadedGroup->signals.size()) + L" 条信号，" +
			    std::to_wstring(loadedGroup->axes.size()) + L" 条时间轴：" + timeNames + L"）";
			if (anyNonMonotonic)
			{
				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, std::vector<SignalGroup>& groups,
	                                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;
		}

		groups = std::move(state.groups);
		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);
		}
	}


} // namespace jdi