// PopupMenu 实现分片 —— 几何与排版（BuildLayout / 子菜单 / 滚动区 / 内联输入框位置）。
//
// 本文件只包含 PopupMenu 的成员函数定义（从 PopupMenu.cpp 机械搬移，行为不变）。
//
// ⚠️ 这里是菜单**唯一**的几何来源：`Paint` 与所有命中测试都读它产出的矩形，
//    不得在别处再反推一遍（否则会出现"看得见点不到"）。
// ⚠️ `NaturalEditFieldWidth` / `EditSuffixWidth` 同时参与排版与绘制，改公式必须两处一致。

#include "PopupMenu.hpp"

#include "PopupMenuInternal.hpp"

namespace jdi
{
	void PopupMenu::Setup(const UiFonts* fonts, const Theme* theme)
	{
		m_fonts = fonts;
		m_theme = theme;
	}

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

	float PopupMenu::ItemHeight(const MenuItem& item) const
	{
		switch (item.kind)
		{
		case MenuItemKind::SEPARATOR:
			return kSeparatorHeight * m_scale;
		case MenuItemKind::HEADER:
		case MenuItemKind::HEADER_ACTION:
			return kHeaderHeight * m_scale;
		case MenuItemKind::SWATCHES:
			return kSwatchRowHeight * m_scale;
		case MenuItemKind::EDIT:
			// 编辑项比普通项略高，给输入框留出上下呼吸空间。
			return (kRowHeight + 4.0f) * m_scale;
		case MenuItemKind::NORMAL:
		default:
			return kRowHeight * m_scale;
		}
	}

	void PopupMenu::BuildLayout(const gd::RectF& bounds, int x, int y, bool expandUp)
	{
		m_itemRects.assign(m_items.size(), gd::RectF());
		m_swatchRects.assign(m_items.size(), std::vector<gd::RectF>());

		if (m_fonts == nullptr)
		{
			m_rect = gd::RectF();
			return;
		}

		float contentWidth = kMinWidth * m_scale;
		float totalHeight = kPadV * 2.0f * m_scale;

		std::vector<float> heights(m_items.size(), 0.0f);
		for (std::size_t index = 0; index < m_items.size(); ++index)
		{
			const MenuItem& item = m_items[index];
			heights[index] = ItemHeight(item);
			totalHeight += heights[index];

			if (item.kind == MenuItemKind::SWATCHES)
			{
				const int count = std::max(0, std::min(item.swatchCount, 16));
				const float width = (kPadH + kItemPad) * 2.0f * m_scale +
				                    static_cast<float>(count) * kSwatchSize * m_scale +
				                    static_cast<float>(std::max(0, count - 1)) * kSwatchGap * m_scale;
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::HEADER || item.kind == MenuItemKind::HEADER_ACTION)
			{
				// 标题与普通项共用同一文字列与右侧标记列，保证整个菜单的左右边距一致。
				const float iconExtra = (item.kind == MenuItemKind::HEADER_ACTION)
				                            ? (kHeaderIconSize + kHeaderIconGap) * m_scale
				                            : 0.0f;
				const float width = (kPadH + kItemPad) * 2.0f * m_scale + kMarkerColumn * m_scale +
				                    kMarkerGap * m_scale + iconExtra +
				                    UiMeasureTextWidth(m_fonts->uiSmallBold, item.label);
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::NORMAL)
			{
				const float width = (kPadH + kItemPad) * 2.0f * m_scale + kMarkerColumn * m_scale +
				                    kMarkerGap * m_scale + UiMeasureTextWidth(m_fonts->uiSmall, item.label);
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::EDIT)
			{
				// 说明文字 + 输入框；输入框宽度按数值文本自适应（与 EditFieldRect 保持一致）。
				const float fieldWidth = NaturalEditFieldWidth(item);
				const float width = (kPadH + kItemPad) * 2.0f * m_scale +
				                    UiMeasureTextWidth(m_fonts->uiSmall, item.label) + kEditFieldGap * m_scale +
				                    fieldWidth;
				contentWidth = std::max(contentWidth, width);
			}
		}

		contentWidth = std::min(contentWidth, kMaxWidth * m_scale);
		const float width = contentWidth;

		// ------------------------------------------------------------------
		// 超长菜单：限制高度 + 条目区可滚动 + 顶部/尾部固定项（见 `MenuLayoutConstraint`）。
		//   * 顶部固定 = **前导的 `HEADER` / `HEADER_ACTION`**（典型：「所属网格」标题）——
		//     用户 2026-10-16 要求：滚动时标题必须留在最上方不动；
		//   * 尾部固定 = **最后一个分隔线及其之后的条目**（典型：「新建网格」）钉在底部；
		//   * 中间是滚动区（鼠标滚轮 / 键盘 / 滚动条），右侧画一根滚动条。
		// ------------------------------------------------------------------
		int pinnedFrom = -1;
		int scrollFirst = 0;
		if (m_constraint.maxHeight > 0.0f || m_constraint.maxScrollRows > 0)
		{
			for (int index = static_cast<int>(m_items.size()) - 1; index > 0; --index)
			{
				if (m_items[static_cast<std::size_t>(index)].kind == MenuItemKind::SEPARATOR)
				{
					pinnedFrom = index;
					break;
				}
			}
			while (scrollFirst < pinnedFrom &&
			       (m_items[static_cast<std::size_t>(scrollFirst)].kind == MenuItemKind::HEADER ||
			        m_items[static_cast<std::size_t>(scrollFirst)].kind == MenuItemKind::HEADER_ACTION))
			{
				++scrollFirst;   // 前导标题固定在顶部，不参与滚动
			}
		}

		float headHeight = 0.0f;
		float scrollRegionHeight = 0.0f;
		float tailHeight = 0.0f;
		if (pinnedFrom > 0)
		{
			for (int index = 0; index < static_cast<int>(m_items.size()); ++index)
			{
				if (index >= pinnedFrom)
				{
					tailHeight += heights[static_cast<std::size_t>(index)];
				}
				else if (index < scrollFirst)
				{
					headHeight += heights[static_cast<std::size_t>(index)];
				}
				else
				{
					scrollRegionHeight += heights[static_cast<std::size_t>(index)];
				}
			}
		}

		float height = totalHeight;
		m_scrollEnabled = false;
		m_scrollRegionHeight = 0.0f;
		m_scrollFirst = 0;
		m_pinnedIndex = -1;
		m_scrollViewport = gd::RectF();
		m_scrollBarRect = gd::RectF();
		// ⚠️ **不要在这里复位 `m_scrollBarDragging`**：拖拽滚动条时每一帧都会 `RebuildLayout()`，
		// 在这里清零会把拖拽态当场吃掉（拖一下断一下）。该状态只在 `Open` / `Close` 里复位。
		// ⚠️ **不要在这里无条件清零 `m_scrollOffset`**：`RebuildLayout()`（滚轮 / 数值回写 / 拖滚动条）
		// 会重新走一遍本函数，清零就等于把滚动位置吃掉（滚轮“滚不动”）。只有在菜单**不再需要**
		// 滚动时才复位（`Open` 里已经为每次打开重置过）。
		if (pinnedFrom > 0)
		{
			// 滚动视口高度上限：`maxHeight`（客户区像素 → 换算成视口可用高）与
			// `maxScrollRows`（标准行数）**取更严格的那个**；0 = 该约束不生效。
			float viewportLimit = 0.0f;
			if (m_constraint.maxHeight > 0.0f)
			{
				// 夹到宿主矩形以内（不盖住窗口边框）；小到放不下时的上限直接视作“不限制”，
				// 交给下方的边界收敛处理，避免算出一个高度为 0 的菜单。
				const float menuLimit = std::min(m_constraint.maxHeight, bounds.Height - 4.0f * m_scale);
				if (menuLimit >= 40.0f * m_scale)
				{
					viewportLimit = std::max(
					    0.0f, menuLimit - kPadV * 2.0f * m_scale - headHeight - tailHeight);
				}
			}
			if (m_constraint.maxScrollRows > 0)
			{
				const float rows =
				    static_cast<float>(m_constraint.maxScrollRows) * kRowHeight * m_scale;
				viewportLimit = (viewportLimit > 0.0f) ? std::min(viewportLimit, rows) : rows;
			}

			if (viewportLimit >= kRowHeight * m_scale && scrollRegionHeight > viewportLimit + 0.5f)
			{
				const float viewportHeight = std::min(scrollRegionHeight, viewportLimit);
				height = kPadV * 2.0f * m_scale + headHeight + viewportHeight + tailHeight;
				m_scrollEnabled = true;
				m_scrollFirst = scrollFirst;
				m_pinnedIndex = pinnedFrom;
				m_scrollRegionHeight = scrollRegionHeight;
				m_scrollOffset = std::max(
				    0.0f, std::min(m_scrollOffset, std::max(0.0f, scrollRegionHeight - viewportHeight)));
			}
			else
			{
				m_scrollOffset = 0.0f;
			}
		}
		else
		{
			m_scrollOffset = 0.0f;
		}

		// 带说明文字的 EDIT 项共用**同一个输入框宽度**：取其中最大的自然宽度，
		// 再按“给最宽的说明文字留位 / 不超过内容区 3/4”夹取。
		// ⚠️ 若每项各自按自己的文本长度算，同一面板里就会出现一个宽一个窄
		//    （时间轴行的文本更长、还带单位后缀，于是它的输入框比 Y 轴行宽一截）。
		float labeledFieldWidth = 0.0f;
		float widestLabel = 0.0f;
		for (const MenuItem& item : m_items)
		{
			if (item.kind != MenuItemKind::EDIT || item.label.empty())
			{
				continue;
			}
			labeledFieldWidth = std::max(labeledFieldWidth, NaturalEditFieldWidth(item));
			widestLabel = std::max(widestLabel,
			                       UiMeasureTextWidth(m_fonts->uiSmall, item.label) +
			                           kEditFieldGap * m_scale);
		}
		if (labeledFieldWidth > 0.0f)
		{
			const float rowContent =
			    std::max(40.0f * m_scale, (width - 2.0f * (kPadH + kItemPad) * m_scale));
			const float limit = std::max(40.0f * m_scale,
			                             std::min(rowContent * 0.75f, rowContent - widestLabel));
			labeledFieldWidth = std::min(labeledFieldWidth, limit);
		}
		m_editFieldWidth = labeledFieldWidth;

		float left = static_cast<float>(x);
		// `expandUp`：锚点是菜单的**左下角**（向上展开）；否则锚点是左上角（向右下展开）。
		float top = expandUp ? (static_cast<float>(y) - height) : static_cast<float>(y);

		// 优先向右展开（向左下/右下）；越界时向左或向上翻转，最后做边界收敛。
		if (left + width > bounds.X + bounds.Width)
		{
			left = static_cast<float>(x) - width;
		}
		if (!expandUp && top + height > bounds.Y + bounds.Height)
		{
			top = static_cast<float>(y) - height;
		}
		left = std::max(bounds.X + 2.0f, std::min(left, bounds.X + bounds.Width - width - 2.0f));
		top = std::max(bounds.Y + 2.0f, std::min(top, bounds.Y + bounds.Height - height - 2.0f));

		m_rect = gd::RectF(left, top, width, height);

		// 条目排布：头部固定区从菜单顶往下排；滚动区条目整体上移 `m_scrollOffset`；
		// 尾部固定区从菜单底部往上对齐。
		const float bodyTop = top + kPadV * m_scale;
		const float tailTop = top + height - kPadV * m_scale - tailHeight;
		const float scrollBarReserve = m_scrollEnabled ? (kScrollBarWidth + kScrollBarGap) * m_scale : 0.0f;
		m_scrollViewport =
		    m_scrollEnabled
		        ? gd::RectF(left + kPadH * m_scale, bodyTop + headHeight,
		                    std::max(0.0f, width - kPadH * 2.0f * m_scale),
		                    std::max(0.0f, height - kPadV * 2.0f * m_scale - headHeight - tailHeight))
		        : gd::RectF();

		float cursorY = bodyTop;
		float headCursorY = bodyTop;
		float scrollCursorY = bodyTop + headHeight - m_scrollOffset;
		float tailCursorY = (m_scrollEnabled) ? tailTop : bodyTop;
		for (std::size_t index = 0; index < m_items.size(); ++index)
		{
			const MenuItem& item = m_items[index];
			const float itemHeight = heights[index];

			float rectY = cursorY;
			float rectWidth = std::max(0.0f, width - kPadH * 2.0f * m_scale);
			if (m_scrollEnabled)
			{
				const int itemIndex = static_cast<int>(index);
				if (itemIndex < m_scrollFirst)
				{
					rectY = headCursorY;
					headCursorY += itemHeight;
				}
				else if (itemIndex < m_pinnedIndex)
				{
					rectY = scrollCursorY;
					scrollCursorY += itemHeight;
					// 滚动区条目让出右侧滚动条的位置（对勾/文本不会压在滑块上）。
					rectWidth = std::max(0.0f, rectWidth - scrollBarReserve);
				}
				else
				{
					rectY = tailCursorY;
					tailCursorY += itemHeight;
				}
			}
			m_itemRects[index] =
			    gd::RectF(left + kPadH * m_scale, rectY, rectWidth, itemHeight);

			if (item.kind == MenuItemKind::SWATCHES)
			{
				const int count = std::max(0, std::min(item.swatchCount, 16));
				std::vector<gd::RectF>& rects = m_swatchRects[index];
				rects.reserve(static_cast<std::size_t>(count));
				const float swatchY = rectY + (itemHeight - kSwatchSize * m_scale) * 0.5f;
				const float startX = left + (kPadH + kItemPad) * m_scale;
				for (int swatch = 0; swatch < count; ++swatch)
				{
					const float swatchX =
					    startX + static_cast<float>(swatch) * (kSwatchSize + kSwatchGap) * m_scale;
					rects.push_back(gd::RectF(swatchX, swatchY, kSwatchSize * m_scale, kSwatchSize * m_scale));
				}
			}

			cursorY += itemHeight;
		}

		// 滚动条轨道：贴在可滚动条目区的右内侧（只在条目区旁边，不会盖住固定区）。
		if (m_scrollEnabled)
		{
			const float thickness = kScrollBarWidth * m_scale;
			m_scrollBarRect = gd::RectF(left + width - kPadH * m_scale - thickness,
			                            m_scrollViewport.Y, thickness, m_scrollViewport.Height);
		}
	}

	bool PopupMenu::ScrollRegion(int& first, int& last) const
	{
		if (!m_scrollEnabled || m_pinnedIndex < 0)
		{
			first = 0;
			last = static_cast<int>(m_items.size());
			return false;
		}
		first = m_scrollFirst;
		last = m_pinnedIndex;
		return true;
	}

	gd::RectF PopupMenu::ScrollBarThumbRect() const
	{
		if (!m_scrollEnabled || m_scrollBarRect.Height <= 0.0f || m_scrollRegionHeight <= 0.0f)
		{
			return gd::RectF();
		}
		const float viewport = m_scrollViewport.Height;
		if (viewport <= 0.0f)
		{
			return gd::RectF();
		}
		const float ratio = std::min(1.0f, viewport / m_scrollRegionHeight);
		const float thumbHeight = std::max(kScrollBarMinThumb * m_scale, m_scrollBarRect.Height * ratio);
		const float maxScroll = std::max(0.0f, m_scrollRegionHeight - viewport);
		const float progress = (maxScroll > 0.0f) ? (m_scrollOffset / maxScroll) : 0.0f;
		const float thumbY =
		    m_scrollBarRect.Y +
		    std::max(0.0f, std::min(1.0f, progress)) * std::max(0.0f, m_scrollBarRect.Height - thumbHeight);
		return gd::RectF(m_scrollBarRect.X, thumbY, m_scrollBarRect.Width, thumbHeight);
	}

	float PopupMenu::ScrollOffsetForThumbTop(float thumbTop) const
	{
		if (!m_scrollEnabled || m_scrollBarRect.Height <= 0.0f)
		{
			return m_scrollOffset;
		}
		const float viewport = m_scrollViewport.Height;
		const float maxScroll = std::max(0.0f, m_scrollRegionHeight - viewport);
		if (maxScroll <= 0.0f)
		{
			return 0.0f;
		}
		const float track = m_scrollBarRect.Height;
		const float thumbHeight = std::max(kScrollBarMinThumb * m_scale, track * std::min(1.0f, viewport / std::max(1.0f, m_scrollRegionHeight)));
		const float travel = std::max(0.0f, track - thumbHeight);
		if (travel <= 0.0f)
		{
			return 0.0f;
		}
		const float relative = thumbTop - m_scrollBarRect.Y;
		const float progress = std::max(0.0f, std::min(1.0f, relative / travel));
		return progress * maxScroll;
	}

	bool PopupMenu::EnsureItemVisible(int index)
	{
		if (!m_scrollEnabled || index < m_scrollFirst || index >= m_pinnedIndex ||
		    m_scrollViewport.Height <= 0.0f)
		{
			return false;
		}
		const gd::RectF& rect = m_itemRects[static_cast<std::size_t>(index)];
		const float relative = rect.Y - m_scrollViewport.Y;
		float delta = 0.0f;
		if (relative < 0.0f)
		{
			delta = relative;
		}
		else if (relative + rect.Height > m_scrollViewport.Height)
		{
			delta = relative + rect.Height - m_scrollViewport.Height;
		}
		if (std::fabs(delta) < 0.5f)
		{
			return false;
		}
		m_scrollOffset += delta;
		// 重新排布（内部会重新夹取 `m_scrollOffset`）。
		RebuildLayout();
		return true;
	}

	bool PopupMenu::OnMouseWheel(int delta)
	{
		if (!m_open || !m_scrollEnabled || delta == 0)
		{
			return false;
		}
		const float previous = m_scrollOffset;
		// 向上滚（`delta > 0`）= 看更靠前的条目 ⇒ 偏移减小。
		m_scrollOffset -= static_cast<float>(delta) / 120.0f * 54.0f * m_scale;
		// 重新排布：条目矩形依赖滚动偏移，同时会夹取到合法范围。
		RebuildLayout();
		return std::fabs(m_scrollOffset - previous) > 0.01f;
	}

	float PopupMenu::NaturalEditFieldWidth(const MenuItem& item) const
	{
		const std::wstring& widest =
		    (item.editValue.size() > item.value.size()) ? item.editValue : item.value;
		const float natural = std::max(kEditFieldWidth * m_scale,
		                               UiMeasureTextWidth(m_fonts->uiSmall, widest) + 20.0f * m_scale);
		const float withSuffix = natural + EditSuffixWidth(item);
		// 无说明文字 = 整行输入框（如「系数调整」面板）：给一个更宽的默认值，视觉上独占整行。
		return item.label.empty() ? std::max(withSuffix, kRowFieldWidth * m_scale) : withSuffix;
	}

	void PopupMenu::CloseSubmenu()
	{
		m_subOpen = false;
		m_subParentIndex = -1;
		m_subRect = gd::RectF();
		m_subItems.clear();
		m_subItemRects.clear();
		m_subHoverIndex = -1;
		m_subPressedIndex = -1;
	}

	void PopupMenu::BuildSubLayout(int parentIndex)
	{
		CloseSubmenu();
		if (parentIndex < 0 || parentIndex >= static_cast<int>(m_items.size()))
		{
			return;
		}
		const MenuItem& parent = m_items[static_cast<std::size_t>(parentIndex)];
		if (parent.kind != MenuItemKind::SUBMENU || parent.submenu.empty())
		{
			return;
		}

		m_subItems = parent.submenu;

		// 与主菜单一致：宽度取条目中的最大者并夹在上下限之间。
		float contentWidth = kMinWidth * m_scale;
		float totalHeight = kPadV * 2.0f * m_scale;
		for (const MenuItem& item : m_subItems)
		{
			totalHeight += ItemHeight(item);
			if (item.kind == MenuItemKind::SWATCHES)
			{
				const int count = std::max(0, std::min(item.swatchCount, 16));
				const float width = (kPadH + kItemPad) * 2.0f * m_scale +
				                    static_cast<float>(count) * kSwatchSize * m_scale +
				                    static_cast<float>(std::max(0, count - 1)) * kSwatchGap * m_scale;
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::HEADER)
			{
				const float width = (kPadH + kItemPad) * 2.0f * m_scale + kMarkerColumn * m_scale +
				                    kMarkerGap * m_scale +
				                    UiMeasureTextWidth(m_fonts->uiSmallBold, item.label);
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::EDIT)
			{
				const float fieldWidth = NaturalEditFieldWidth(item);
				const float width = (kPadH + kItemPad) * 2.0f * m_scale +
				                    UiMeasureTextWidth(m_fonts->uiSmall, item.label) + kEditFieldGap * m_scale +
				                    fieldWidth;
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::NORMAL || item.kind == MenuItemKind::SUBMENU)
			{
				const float width = (kPadH + kItemPad) * 2.0f * m_scale + kMarkerColumn * m_scale +
				                    kMarkerGap * m_scale + UiMeasureTextWidth(m_fonts->uiSmall, item.label);
				contentWidth = std::max(contentWidth, width);
			}
		}
		contentWidth = std::min(contentWidth, kMaxWidth * m_scale);

		const float width = contentWidth;
		const float height = totalHeight;
		const gd::RectF& parentRect = m_itemRects[static_cast<std::size_t>(parentIndex)];
		const gd::RectF& bounds = m_buildBounds;

		// 默认贴主菜单右缘并向上与父项顶端对齐；右侧空间不足时翻到左侧。
		float left = m_rect.X + m_rect.Width - kSubOverlap * m_scale;
		if (left + width > bounds.X + bounds.Width - 2.0f)
		{
			left = m_rect.X - width + kSubOverlap * m_scale;
		}
		left = std::max(bounds.X + 2.0f, std::min(left, bounds.X + bounds.Width - width - 2.0f));

		float top = parentRect.Y - kPadV * m_scale;
		top = std::max(bounds.Y + 2.0f, std::min(top, bounds.Y + bounds.Height - height - 2.0f));

		m_subRect = gd::RectF(left, top, width, height);
		m_subItemRects.assign(m_subItems.size(), gd::RectF());

		float cursorY = top + kPadV * m_scale;
		for (std::size_t index = 0; index < m_subItems.size(); ++index)
		{
			const float itemHeight = ItemHeight(m_subItems[index]);
			m_subItemRects[index] = gd::RectF(left + kPadH * m_scale, cursorY,
			                                  std::max(0.0f, width - kPadH * 2.0f * m_scale), itemHeight);
			cursorY += itemHeight;
		}

		m_subParentIndex = parentIndex;
		m_subOpen = true;
		m_subHoverIndex = -1;
		m_subPressedIndex = -1;
	}

	int PopupMenu::SubItemAtPoint(int x, int y) const
	{
		if (!m_subOpen)
		{
			return -1;
		}
		const float fx = static_cast<float>(x);
		const float fy = static_cast<float>(y);
		for (std::size_t index = 0; index < m_subItems.size(); ++index)
		{
			const MenuItem& item = m_subItems[index];
			if (item.kind == MenuItemKind::SEPARATOR || item.kind == MenuItemKind::HEADER)
			{
				continue;
			}
			if (!item.enabled)
			{
				continue;
			}
			if (UiPointInRect(m_subItemRects[index], fx, fy))
			{
				return static_cast<int>(index);
			}
		}
		return -1;
	}

	float PopupMenu::EditSuffixWidth(const MenuItem& item) const
	{
		if (item.kind != MenuItemKind::EDIT || item.editSuffix.empty())
		{
			return 0.0f;
		}
		return UiMeasureTextWidth(m_fonts->uiSmall, item.editSuffix) + 8.0f * m_scale;
	}

	gd::RectF PopupMenu::EditFieldRect(int index) const
	{
		if (index < 0 || index >= static_cast<int>(m_items.size()))
		{
			return gd::RectF();
		}
		const MenuItem& item = m_items[static_cast<std::size_t>(index)];
		if (item.kind != MenuItemKind::EDIT)
		{
			return gd::RectF();
		}

		// 输入框靠右对齐到条目内容区右边界；宽度取自然宽度，但必须给说明文字留出自然宽度，
		// 避免菜单被最大宽度夹取后输入框把左侧标签挤成省略号。
		// ⚠️ 说明文字为空（例如「系数调整」面板的整行输入框）时不设 3/4 上限，
		// 让输入框独占整行。
		// ⚠️ 带说明文字的项统一使用排布阶段算好的 `m_editFieldWidth`：
		//    同一面板里所有这类输入框必须一样宽、右边界对齐。
		const gd::RectF& rect = m_itemRects[static_cast<std::size_t>(index)];
		const float contentWidth = std::max(40.0f * m_scale, rect.Width - 2.0f * kItemPad * m_scale);
		const float labelWidth = UiMeasureTextWidth(m_fonts->uiSmall, item.label) + kEditFieldGap * m_scale;
		float width = NaturalEditFieldWidth(item);
		width = std::min(width, std::max(40.0f * m_scale, contentWidth - labelWidth));
		if (item.label.empty())
		{
			// 整行输入框（无说明文字）：占满内容区，视觉上就是一个独立的一行输入框。
			width = contentWidth;
		}
		else
		{
			if (m_editFieldWidth > 0.0f)
			{
				width = m_editFieldWidth;
			}
			width = std::min(width, std::max(40.0f * m_scale, contentWidth - labelWidth));
			width = std::min(width, contentWidth * 0.75f);
		}

		const float height = rect.Height - kEditFieldPadV * 2.0f * m_scale;
		return gd::RectF(rect.X + rect.Width - kItemPad * m_scale - width,
		                 rect.Y + (rect.Height - height) * 0.5f, width, height);
	}

	gd::RectF PopupMenu::HeaderIconRect(int index) const
	{
		if (index < 0 || index >= static_cast<int>(m_items.size()))
		{
			return gd::RectF();
		}
		const MenuItem& item = m_items[static_cast<std::size_t>(index)];
		if (item.kind != MenuItemKind::HEADER_ACTION)
		{
			return gd::RectF();
		}
		const gd::RectF& rect = m_itemRects[static_cast<std::size_t>(index)];
		const float size = std::min(kHeaderIconSize * m_scale, std::max(6.0f, rect.Height - 4.0f * m_scale));
		return gd::RectF(rect.X + rect.Width - kItemPad * m_scale - size,
		                 rect.Y + (rect.Height - size) * 0.5f, size, size);
	}

	bool PopupMenu::IsOnEditField(int x, int y) const
	{
		if (m_editIndex < 0)
		{			return false;
		}
		const gd::RectF rect = EditFieldRect(m_editIndex);
		return UiPointInRect(rect, static_cast<float>(x), static_cast<float>(y));
	}

	bool PopupMenu::BeginItemEdit(int index)
	{
		if (!m_open || index < 0 || index >= static_cast<int>(m_items.size()))
		{
			return false;
		}
		const MenuItem& item = m_items[static_cast<std::size_t>(index)];
		if (item.kind != MenuItemKind::EDIT || !item.enabled)
		{
			return false;
		}

		// 输入框初值取「编辑初值」（未设置时用显示值），整段选中，便于直接键入新数值。
		m_edit.Begin(item.editValue.empty() ? item.value : item.editValue, true, item.filter, 0u);
		m_editIndex = index;
		m_hoverIndex = index;
		return true;
	}

	bool PopupMenu::EndItemEdit(bool commit, MenuResult& result)
	{
		if (m_editIndex < 0)
		{
			return false;
		}

		const int index = m_editIndex;
		const std::wstring text = m_edit.Text();
		m_editIndex = -1;
		m_edit.End();

		if (!commit || index >= static_cast<int>(m_items.size()))
		{
			return true;
		}

		MenuItem& item = m_items[static_cast<std::size_t>(index)];
		// 立即回写显示值，使菜单上的数值与数据层一致（宿主会在派发后再纠正为夹取后的真实值）；
		// 键入文本同时记为**编辑初值**（`value` 与 `editValue` 不一致的行也能正确回显上次输入）。
		item.value = text;
		item.editValue = text;

		result.valid = true;
		result.scope = m_scope;
		result.id = item.id;
		result.editCommit = true;
		result.editText = text;
		return true;
	}

	void PopupMenu::RebuildLayout()
	{
		if (!m_open)
		{
			return;
		}
		const int subParent = m_subParentIndex;
		BuildLayout(m_buildBounds, m_buildX, m_buildY, m_buildExpandUp);
		// 主菜单重新排布后子菜单位置会失效：若之前是展开的则按新几何重建。
		if (subParent >= 0)
		{
			BuildSubLayout(subParent);
		}
	}

	bool PopupMenu::UpdateItemValue(int id, const std::wstring& value, const std::wstring& editValue)
	{
		for (MenuItem& item : m_items)
		{
			if (item.id == id && item.kind == MenuItemKind::EDIT)
			{
				const bool valueSame = (item.value == value);
				const bool editSame = editValue.empty() || (item.editValue == editValue);
				if (valueSame && editSame)
				{
					return true;
				}
				item.value = value;
				if (!editValue.empty())
				{
					item.editValue = editValue;
				}
				RebuildLayout();
				return true;
			}
		}
		return false;
	}

	bool PopupMenu::UpdateItemLabel(int id, const std::wstring& label, bool checked, bool enabled)
	{
		for (MenuItem& item : m_items)
		{
			if (item.id == id && item.kind == MenuItemKind::NORMAL)
			{
				if (item.label == label && item.checked == checked && item.enabled == enabled)
				{
					return true;
				}
				item.label = label;
				item.checked = checked;
				item.enabled = enabled;
				RebuildLayout();
				return true;
			}
		}
		return false;
	}

	bool PopupMenu::UpdateSubmenuItemLabel(int id, const std::wstring& label, bool checked,
	                                       bool enabled)
	{
		for (std::size_t parentIndex = 0; parentIndex < m_items.size(); ++parentIndex)
		{
			MenuItem& parent = m_items[parentIndex];
			if (parent.kind != MenuItemKind::SUBMENU)
			{
				continue;
			}
			for (MenuItem& option : parent.submenu)
			{
				if (option.id != id || option.kind != MenuItemKind::NORMAL)
				{
					continue;
				}
				if (option.label == label && option.checked == checked && option.enabled == enabled)
				{
					return true;
				}
				option.label = label;
				option.checked = checked;
				option.enabled = enabled;
				// 子菜单是 `parent.submenu` 的**快照**（`m_subItems`），必须重建才生效。
				if (m_subOpen && m_subParentIndex == static_cast<int>(parentIndex))
				{
					BuildSubLayout(static_cast<int>(parentIndex));
				}
				return true;
			}
		}
		return false;
	}

} // namespace jdi