#include "PopupMenu.hpp"

#include <algorithm>
#include <cmath>

namespace jdi
{

	namespace
	{
		const float kRowHeight = 27.0f;			/**< 普通项高度。 */
		const float kHeaderHeight = 22.0f;		/**< 分组标题高度。 */
		const float kSeparatorHeight = 9.0f;	/**< 分隔线高度。 */
		const float kSwatchRowHeight = 32.0f;	/**< 色块行高度。 */
		const float kPadV = 5.0f;				/**< 菜单上下内边距。 */
		const float kPadH = 6.0f;				/**< 菜单左右内边距。 */
		const float kMarkerColumn = 22.0f;		/**< 选中标记列宽度。 */
		const float kRightPad = 14.0f;			/**< 文本右侧留白。 */
		const float kMinWidth = 148.0f;			/**< 菜单最小宽度。 */
		const float kMaxWidth = 340.0f;			/**< 菜单最大宽度。 */
		const float kCorner = 6.0f;				/**< 菜单圆角半径。 */
		const float kSwatchSize = 22.0f;		/**< 色块尺寸。 */
		const float kSwatchGap = 5.0f;			/**< 色块间距。 */
		const float kEditFieldWidth = 88.0f;	/**< EDIT 项输入框宽度。 */
		const float kEditFieldGap = 6.0f;		/**< 说明文字与输入框之间的最小间隔。 */
		const float kEditFieldPadV = 5.0f;	/**< 输入框上下内缩。 */
	}

	PopupMenu::PopupMenu() = default;

	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:
			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)
	{
		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;

		for (std::size_t index = 0; index < m_items.size(); ++index)
		{
			const MenuItem& item = m_items[index];
			totalHeight += ItemHeight(item);

			if (item.kind == MenuItemKind::SWATCHES)
			{
				const int count = std::max(0, std::min(item.swatchCount, 16));
				const float width = kPadH * 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 + 8.0f) * m_scale +
				                    UiMeasureTextWidth(m_fonts->uiSmallBold, item.label) + kRightPad * m_scale;
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::NORMAL)
			{
				const float width = (kPadH + kMarkerColumn) * m_scale +
				                    UiMeasureTextWidth(m_fonts->uiSmall, item.label) + kRightPad * m_scale;
				contentWidth = std::max(contentWidth, width);
			}
			else if (item.kind == MenuItemKind::EDIT)
			{
				// 说明文字 + 输入框 + 右侧留白；输入框宽度按数值文本自适应（取一个上限）。
				const float fieldWidth =
				    std::max(kEditFieldWidth * m_scale,
				             UiMeasureTextWidth(m_fonts->uiSmall, item.value) + 20.0f * m_scale);
				const float width = (kPadH + 8.0f) * m_scale +
				                    UiMeasureTextWidth(m_fonts->uiSmall, item.label) + kEditFieldGap * m_scale +
				                    fieldWidth + kRightPad * m_scale;
				contentWidth = std::max(contentWidth, width);
			}
		}

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

		float left = static_cast<float>(x);
		float top = static_cast<float>(y);

		// 优先向右下展开；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 (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);

		float cursorY = top + kPadV * m_scale;
		for (std::size_t index = 0; index < m_items.size(); ++index)
		{
			const MenuItem& item = m_items[index];
			const float itemHeight = ItemHeight(item);
			m_itemRects[index] = gd::RectF(left + kPadH * m_scale, cursorY,
			                               std::max(0.0f, width - kPadH * 2.0f * m_scale), 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 = cursorY + (itemHeight - kSwatchSize * m_scale) * 0.5f;
				const float startX = left + (kPadH + 4.0f) * 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;
		}
	}

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

		// 输入框靠右对齐：宽度取固定下限与当前文本宽度中的较大者，但不得超过菜单可用宽度的一半。
		const gd::RectF& rect = m_itemRects[static_cast<std::size_t>(index)];
		const float maxWidth = std::max(40.0f * m_scale, rect.Width * 0.5f);
		float width = std::max(kEditFieldWidth * m_scale,
		                       UiMeasureTextWidth(m_fonts->uiSmall, m_items[static_cast<std::size_t>(index)].value) +
		                           20.0f * m_scale);
		width = std::min(width, maxWidth);

		const float height = rect.Height - kEditFieldPadV * 2.0f * m_scale;
		return gd::RectF(rect.X + rect.Width - width - 4.0f * m_scale,
		                 rect.Y + (rect.Height - height) * 0.5f, width, height);
	}

	int PopupMenu::EditingItemId() const
	{
		if (m_editIndex < 0 || m_editIndex >= static_cast<int>(m_items.size()))
		{
			return 0;
		}
		return m_items[static_cast<std::size_t>(m_editIndex)].id;
	}

	bool PopupMenu::IsOnEditField(int x, int y) const
	{
		if (m_editIndex < 0)
		{
			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;
		}

		// 输入框初值取当前显示值，整段选中，便于直接键入新数值。
		m_edit.Begin(item.value, 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）。
		item.value = 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;
		}
		BuildLayout(m_buildBounds, m_buildX, m_buildY);
	}

	bool PopupMenu::UpdateItemValue(int id, const std::wstring& value)
	{
		for (MenuItem& item : m_items)
		{
			if (item.id == id && item.kind == MenuItemKind::EDIT)
			{
				if (item.value == value)
				{
					return true;
				}
				item.value = value;
				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::OnEditMouseDown(int x, int y)
	{
		if (m_editIndex < 0)
		{
			return false;
		}
		return UiEditFieldMouseDown(m_fonts->uiSmall, EditFieldRect(m_editIndex), m_edit, m_scale, x, y);
	}

	bool PopupMenu::OnEditMouseMove(int x)
	{
		if (m_editIndex < 0)
		{
			return false;
		}
		return UiEditFieldMouseMove(m_fonts->uiSmall, EditFieldRect(m_editIndex), m_edit, m_scale, x);
	}

	bool PopupMenu::OnEditMouseUp()
	{
		if (!m_edit.Dragging())
		{
			return false;
		}
		m_edit.EndDrag();
		return true;
	}

	bool PopupMenu::OnChar(wchar_t character, MenuResult& result)
	{
		result = MenuResult();
		if (m_editIndex < 0)
		{
			return false;
		}

		// 剪贴板与全选快捷键经 WM_CHAR 送达（Ctrl+C/X/V/A 分别对应 3/24/22/1）。
		switch (character)
		{
		case 0x03: // Ctrl+C
			m_edit.CopyToClipboard(m_host);
			return false;
		case 0x18: // Ctrl+X
			return m_edit.CutToClipboard(m_host);
		case 0x16: // Ctrl+V
			return m_edit.PasteFromClipboard(m_host);
		case 0x01: // Ctrl+A
			m_edit.SelectAll();
			return true;
		default:
			break;
		}

		if (character == L'\r' || character == L'\n')
		{
			// 回车提交：菜单保持打开，仅把新数值回传宿主。
			EndItemEdit(true, result);
			return true;
		}
		// 退格/删除已由 WM_KEYDOWN 处理，此处忽略控制字符避免重复删除。
		if (character < 0x20 || character == 0x7F)
		{
			return false;
		}
		return m_edit.Insert(character);
	}

	void PopupMenu::Open(MenuScope scope, const gd::RectF& bounds, int x, int y,
	                     const std::vector<MenuItem>& items)
	{
		m_items = items;
		if (m_items.empty())
		{
			Close();
			return;
		}

		m_scope = scope;
		m_open = true;
		m_hoverIndex = -1;
		m_hoverSwatch = -1;
		m_pressedIndex = -1;
		m_pressedSwatch = -1;
		m_buildBounds = bounds;
		m_buildX = x;
		m_buildY = y;

		CloseEditState();
		BuildLayout(bounds, x, y);
	}

	void PopupMenu::Close()
	{
		m_open = false;
		m_scope = MenuScope::NONE;
		m_items.clear();
		m_itemRects.clear();
		m_swatchRects.clear();
		m_hoverIndex = -1;
		m_hoverSwatch = -1;
		m_pressedIndex = -1;
		m_pressedSwatch = -1;
		CloseEditState();
	}

	void PopupMenu::CloseEditState()
	{
		if (m_editIndex >= 0)
		{
			m_edit.End();
		}
		m_editIndex = -1;
	}

	bool PopupMenu::ContainsPoint(int x, int y) const
	{
		if (!m_open)
		{
			return false;
		}
		return UiPointInRect(m_rect, static_cast<float>(x), static_cast<float>(y));
	}

	int PopupMenu::ItemAtPoint(int x, int y, int& swatchIndex) const
	{
		swatchIndex = -1;
		if (!m_open)
		{
			return -1;
		}

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

		for (std::size_t index = 0; index < m_items.size(); ++index)
		{
			const MenuItem& item = m_items[index];
			if (item.kind == MenuItemKind::SEPARATOR || item.kind == MenuItemKind::HEADER)
			{
				continue;
			}
			if (!UiPointInRect(m_itemRects[index], fx, fy))
			{
				continue;
			}

			if (item.kind == MenuItemKind::SWATCHES)
			{
				const std::vector<gd::RectF>& rects = m_swatchRects[index];
				for (std::size_t swatch = 0; swatch < rects.size(); ++swatch)
				{
					if (UiPointInRect(rects[swatch], fx, fy))
					{
						swatchIndex = static_cast<int>(swatch);
						return static_cast<int>(index);
					}
				}
				// 落在色块行的空白处：整行视为可点击，用于定位提示。
				return -1;
			}

			if (!item.enabled)
			{
				return -1;
			}
			return static_cast<int>(index);
		}
		return -1;
	}

	void PopupMenu::MoveHover(int step)
	{
		if (m_items.empty())
		{
			return;
		}

		const int count = static_cast<int>(m_items.size());
		int index = m_hoverIndex;
		for (int attempt = 0; attempt < count; ++attempt)
		{
			index += step;
			if (index < 0)
			{
				index = count - 1;
			}
			else if (index >= count)
			{
				index = 0;
			}

			const MenuItem& item = m_items[static_cast<std::size_t>(index)];
			if ((item.kind == MenuItemKind::NORMAL || item.kind == MenuItemKind::EDIT) && item.enabled)
			{
				m_hoverIndex = index;
				m_hoverSwatch = -1;
				return;
			}
		}
	}

	bool PopupMenu::CommitHover(MenuResult& result)
	{
		if (m_hoverIndex < 0 || m_hoverIndex >= static_cast<int>(m_items.size()))
		{
			return false;
		}

		const MenuItem& item = m_items[static_cast<std::size_t>(m_hoverIndex)];
		if (!item.enabled)
		{
			return false;
		}

		// 编辑项：回车等价于单击进入编辑，菜单不关闭。
		if (item.kind == MenuItemKind::EDIT)
		{
			BeginItemEdit(m_hoverIndex);
			return false;
		}
		if (item.kind != MenuItemKind::NORMAL)
		{
			return false;
		}

		result.valid = true;
		result.scope = m_scope;
		result.id = item.id;
		result.swatchIndex = -1;
		result.itemRect = m_itemRects[static_cast<std::size_t>(m_hoverIndex)];
		return true;
	}

	bool PopupMenu::OnMouseMove(int x, int y)
	{
		if (!m_open)
		{
			return false;
		}

		int swatchIndex = -1;
		const int index = ItemAtPoint(x, y, swatchIndex);

		if (index == m_hoverIndex && swatchIndex == m_hoverSwatch)
		{
			return false;
		}
		m_hoverIndex = index;
		m_hoverSwatch = swatchIndex;
		return true;
	}

	bool PopupMenu::OnLButtonDown(int x, int y, MenuResult& result)
	{
		result = MenuResult();
		if (!m_open)
		{
			return false;
		}

		if (!ContainsPoint(x, y))
		{
			// 点击菜单外部：先提交正在编辑的数值，再关闭菜单。
			EndItemEdit(true, result);
			Close();
			return true;
		}

		// 已经处于编辑状态时：点击当前输入框 → 重新定位插入符；
		// 点击其它位置 → 先提交本次编辑（菜单不关闭），再按新位置继续处理。
		if (m_editIndex >= 0)
		{
			if (IsOnEditField(x, y))
			{
				OnEditMouseDown(x, y);
				m_pressedIndex = m_editIndex;
				m_pressedSwatch = -1;
				return true;
			}
			EndItemEdit(true, result);
		}

		int swatchIndex = -1;
		m_pressedIndex = ItemAtPoint(x, y, swatchIndex);
		m_pressedSwatch = swatchIndex;
		return true;
	}

	bool PopupMenu::OnLButtonUp(int x, int y, MenuResult& result)
	{
		const MenuResult editResult = result;
		result = MenuResult();
		if (!m_open)
		{
			return false;
		}

		// 编辑态下松开：先结束拖拽框选，不当作普通项点击。
		if (m_editIndex >= 0)
		{
			OnEditMouseUp();
			m_pressedIndex = -1;
			m_pressedSwatch = -1;
			result = editResult;
			return true;
		}

		int swatchIndex = -1;
		const int index = ItemAtPoint(x, y, swatchIndex);
		const int pressedIndex = m_pressedIndex;
		const int pressedSwatch = m_pressedSwatch;
		m_pressedIndex = -1;
		m_pressedSwatch = -1;

		// 在菜单之外释放鼠标时视为取消操作。
		if (!ContainsPoint(x, y))
		{
			Close();
			return true;
		}

		if (index < 0 || index != pressedIndex)
		{
			return true;
		}

		const MenuItem& item = m_items[static_cast<std::size_t>(index)];

		// 编辑项：单击进入菜单内联编辑，菜单保持打开。
		if (item.kind == MenuItemKind::EDIT)
		{
			BeginItemEdit(index);
			return true;
		}

		result.valid = true;
		result.scope = m_scope;
		result.id = item.id;
		result.swatchIndex = -1;
		result.itemRect = m_itemRects[static_cast<std::size_t>(index)];

		if (item.kind == MenuItemKind::SWATCHES)
		{
			if (swatchIndex < 0 || swatchIndex != pressedSwatch)
			{
				result.valid = false;
				return true;
			}
			result.swatchIndex = swatchIndex;
		}

		Close();
		return true;
	}

	bool PopupMenu::OnKeyDown(WPARAM key, MenuResult& result)
	{
		result = MenuResult();
		if (!m_open)
		{
			return false;
		}

		// 编辑态下按键全部交给输入框（回车提交、Esc 取消本次编辑但菜单保持打开）。
		if (m_editIndex >= 0)
		{
			const bool shift = (GetKeyState(VK_SHIFT) & 0x8000) != 0;
			switch (key)
			{
			case VK_ESCAPE:
				EndItemEdit(false, result);
				return true;
			case VK_RETURN:
				EndItemEdit(true, result);
				return true;
			case VK_BACK:
				m_edit.Backspace();
				return true;
			case VK_DELETE:
				m_edit.DeleteForward();
				return true;
			case VK_LEFT:
				m_edit.MoveCaret(-1, shift);
				return true;
			case VK_RIGHT:
				m_edit.MoveCaret(1, shift);
				return true;
			case VK_HOME:
				m_edit.MoveHome(shift);
				return true;
			case VK_END:
				m_edit.MoveEnd(shift);
				return true;
			default:
				break;
			}
			return true;
		}

		switch (key)
		{
		case VK_ESCAPE:
			Close();
			return true;
		case VK_DOWN:
			MoveHover(1);
			return true;
		case VK_UP:
			MoveHover(-1);
			return true;
		case VK_RETURN:
		{
			if (CommitHover(result))
			{
				Close();
			}
			return true;
		}
		default:
			break;
		}
		return true;
	}

	void PopupMenu::Paint(gd::Graphics& g)
	{
		if (!m_open || m_theme == nullptr || m_fonts == nullptr || m_rect.Width <= 0.0f)
		{
			return;
		}

		// 投影：用两层递减透明度的圆角矩形模拟，避免引入系统阴影 API。
		UiFillRoundRect(g, gd::RectF(m_rect.X + 1.0f * m_scale, m_rect.Y + 2.0f * m_scale, m_rect.Width,
		                             m_rect.Height),
		                kCorner * m_scale, 0x14000000u);
		UiFillRoundRect(g, gd::RectF(m_rect.X + 2.0f * m_scale, m_rect.Y + 4.0f * m_scale, m_rect.Width,
		                             m_rect.Height),
		                kCorner * m_scale, 0x10000000u);

		UiFillRoundRect(g, m_rect, kCorner * m_scale, m_theme->cardBg);
		UiDrawRoundRect(g, m_rect, kCorner * m_scale, m_theme->borderStrong, 1.0f);

		for (std::size_t index = 0; index < m_items.size(); ++index)
		{
			const MenuItem& item = m_items[index];
			const gd::RectF& rect = m_itemRects[index];

			if (item.kind == MenuItemKind::SEPARATOR)
			{
				const float lineY = rect.Y + rect.Height * 0.5f;
				UiDrawLine(g, rect.X + 4.0f * m_scale, lineY, rect.X + rect.Width - 4.0f * m_scale, lineY,
				           m_theme->border, 1.0f);
				continue;
			}

			if (item.kind == MenuItemKind::HEADER)
			{
				UiText(g, item.label, m_fonts->uiSmallBold,
				       gd::RectF(rect.X + 8.0f * m_scale, rect.Y, rect.Width, rect.Height),
				       m_theme->textMuted, TextAlign::LEFT);
				continue;
			}

			const bool hovered = (static_cast<int>(index) == m_hoverIndex) &&
			                     (item.kind != MenuItemKind::SWATCHES || m_hoverSwatch < 0);

			if (item.kind == MenuItemKind::EDIT)
			{
				// 编辑项：左侧说明文字 + 右侧内联输入框（与拾色器的 RGB 编辑同一种处理方式，
				// 菜单始终不关闭，数值就地修改）。
				if (hovered && item.enabled && static_cast<int>(index) != m_editIndex)
				{
					UiFillRoundRect(g, rect, 4.0f * m_scale, WithAlpha(m_theme->accent, 0x22));
				}

				const std::uint32_t labelColor = item.enabled ? m_theme->text : m_theme->textMuted;
				const float labelLeft = rect.X + 8.0f * m_scale;
				const gd::RectF fieldRect = EditFieldRect(static_cast<int>(index));
				const float labelWidth = std::max(8.0f, fieldRect.X - labelLeft - kEditFieldGap * m_scale);
				UiText(g, UiEllipsize(g, item.label, m_fonts->uiSmall, labelWidth), m_fonts->uiSmall,
				       gd::RectF(labelLeft, rect.Y, labelWidth, rect.Height), labelColor, TextAlign::LEFT);

				if (static_cast<int>(index) == m_editIndex)
				{
					UiDrawEditField(g, fieldRect, m_edit, m_fonts->uiSmall, m_scale);
				}
				else
				{
					UiFillRoundRect(g, fieldRect, 3.0f * m_scale, m_theme->pressed);
					UiDrawRoundRect(g, fieldRect, 3.0f * m_scale, m_theme->border, 1.0f);
					const std::wstring text =
					    UiEllipsize(g, item.value, m_fonts->uiSmall, fieldRect.Width - 12.0f * m_scale);
					UiText(g, text, m_fonts->uiSmall,
					       gd::RectF(fieldRect.X + 6.0f * m_scale, fieldRect.Y,
					                 std::max(8.0f, fieldRect.Width - 12.0f * m_scale), fieldRect.Height),
					       item.enabled ? m_theme->textStrong : m_theme->textMuted, TextAlign::LEFT);
				}
				continue;
			}

			if (item.kind == MenuItemKind::SWATCHES)
			{
				const std::vector<gd::RectF>& rects = m_swatchRects[index];
				for (std::size_t swatch = 0; swatch < rects.size(); ++swatch)
				{
					const gd::RectF& swatchRect = rects[swatch];
					UiFillRoundRect(g, swatchRect, 4.0f * m_scale, item.swatches[swatch]);

					const bool swatchHover = (static_cast<int>(index) == m_hoverIndex) &&
					                         (static_cast<int>(swatch) == m_hoverSwatch);
					if (static_cast<int>(swatch) == item.checkedSwatch || swatchHover)
					{
						const gd::RectF ring(swatchRect.X - 2.0f * m_scale, swatchRect.Y - 2.0f * m_scale,
						                     swatchRect.Width + 4.0f * m_scale,
						                     swatchRect.Height + 4.0f * m_scale);
						UiDrawRoundRect(g, ring, 5.0f * m_scale,
						                (static_cast<int>(swatch) == item.checkedSwatch) ? m_theme->textStrong
						                                                                : m_theme->borderStrong,
						                (static_cast<int>(swatch) == item.checkedSwatch) ? 1.8f : 1.0f);
					}
				}
				continue;
			}

			// 普通项。
			std::uint32_t background = 0;
			if (hovered && item.enabled)
			{
				background = m_theme->accent;
			}
			else if (static_cast<int>(index) == m_pressedIndex)
			{
				background = m_theme->pressed;
			}
			if (background != 0)
			{
				UiFillRoundRect(g, rect, 4.0f * m_scale, background);
			}

			const std::uint32_t textColor = !item.enabled ? m_theme->textMuted
			                                            : ((hovered && item.enabled) ? m_theme->textOnAccent
			                                                                        : m_theme->text);

			if (item.checked)
			{
				// 单选标记：对勾。
				const float cx = rect.X + kMarkerColumn * m_scale * 0.5f + 2.0f * m_scale;
				const float cy = rect.Y + rect.Height * 0.5f;
				UiDrawLine(g, cx - 4.0f * m_scale, cy, cx - 1.0f * m_scale, cy + 3.0f * m_scale,
				           hovered ? m_theme->textOnAccent : m_theme->accent, 1.8f * m_scale);
				UiDrawLine(g, cx - 1.0f * m_scale, cy + 3.0f * m_scale, cx + 4.5f * m_scale,
				           cy - 4.0f * m_scale, hovered ? m_theme->textOnAccent : m_theme->accent,
				           1.8f * m_scale);
			}

			const float textLeft = rect.X + kMarkerColumn * m_scale;
			const float textWidth = rect.Width - kMarkerColumn * m_scale - 4.0f * m_scale;
			UiText(g, UiEllipsize(g, item.label, m_fonts->uiSmall, textWidth), m_fonts->uiSmall,
			       gd::RectF(textLeft, rect.Y, std::max(8.0f, textWidth), rect.Height), textColor,
			       TextAlign::LEFT);
		}
	}

} // namespace jdi