Just-DataInspector/Components/Shared/Src/PopupMenu.cpp

#include "PopupMenu.hpp"

#include <algorithm>
#include <cmath>

#include "PopupMenuInternal.hpp"
#include "UiControls.hpp"

namespace jdi
{
	PopupMenu::PopupMenu() = default;


	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, bool expandUp,
	                     const MenuLayoutConstraint& constraint)
	{
		m_items = items;
		if (m_items.empty())
		{
			Close();
			return;
		}

		m_scope = scope;
		m_open = true;
		m_hoverIndex = -1;
		m_hoverIconIndex = -1;
		m_hoverSwatch = -1;
		m_pressedIndex = -1;
		m_pressedSwatch = -1;
		m_buildBounds = bounds;
		m_buildX = x;
		m_buildY = y;
		m_buildExpandUp = expandUp;
		// 每次打开都从顶部开始（滚动位置不跨次沿用）。
		m_constraint = constraint;
		m_scrollOffset = 0.0f;
		m_scrollBarDragging = false;

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

	void PopupMenu::Close()
	{
		m_open = false;
		m_scope = MenuScope::NONE;
		m_items.clear();
		m_itemRects.clear();
		m_swatchRects.clear();
		m_hoverIndex = -1;
		m_hoverIconIndex = -1;
		m_hoverSwatch = -1;
		m_pressedIndex = -1;
		m_pressedSwatch = -1;
		m_constraint = MenuLayoutConstraint();
		m_scrollFirst = 0;
		m_pinnedIndex = -1;
		m_scrollEnabled = false;
		m_scrollOffset = 0.0f;
		m_scrollRegionHeight = 0.0f;
		m_scrollViewport = gd::RectF();
		m_scrollBarRect = gd::RectF();
		m_scrollBarDragging = false;
		m_scrollBarGrabOffset = 0.0f;
		CloseSubmenu();
		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;
		}
		const float fx = static_cast<float>(x);
		const float fy = static_cast<float>(y);
		if (UiPointInRect(m_rect, fx, fy))
		{
			return true;
		}
		// 展开的二级子菜单同样属于菜单范围（否则在子菜单内点击会被当成“点菜单外”）。
		return m_subOpen && UiPointInRect(m_subRect, fx, fy);
	}

	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;
			}
			// 可滚动菜单：滚动区内的条目还必须落在**滚动视口**内 ——
			// 夹在视口边界上、只有一部分可见的条目，只有落在视口内的那一部分可以点击。
			// ⚠️ 前导标题与末尾固定项不在滚动区内，它们始终完整可见（不参与本判定）。
			if (m_scrollEnabled && static_cast<int>(index) >= m_scrollFirst &&
			    static_cast<int>(index) < m_pinnedIndex && !UiPointInRect(m_scrollViewport, 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;
				// 键盘移动时把目标条目滚入可视区（长菜单里按方向键不能“跳到看不见的条目”）。
				EnsureItemVisible(index);
				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;
		}

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

		// 正在拖拽滚动条滑块：忽略悬停，只跟随鼠标滚动条目区。
		if (m_scrollBarDragging)
		{
			const float previous = m_scrollOffset;
			m_scrollOffset = ScrollOffsetForThumbTop(fy - m_scrollBarGrabOffset);
			RebuildLayout();
			return std::fabs(m_scrollOffset - previous) > 0.01f;
		}

		// 鼠标在展开的子菜单内：只更新子菜单的悬停项（主菜单父项保持高亮）。
		if (m_subOpen && UiPointInRect(m_subRect, fx, fy))
		{
			const int sub = SubItemAtPoint(x, y);
			if (sub != m_subHoverIndex)
			{
				m_subHoverIndex = sub;
				changed = true;
			}
			return changed;
		}

		int swatchIndex = -1;
		const int index = ItemAtPoint(x, y, swatchIndex);
		const bool onSubmenuParent =
		    (index >= 0) && (m_items[static_cast<std::size_t>(index)].kind == MenuItemKind::SUBMENU);

		// 子菜单展开期间，鼠标只要仍停留在「主菜单 ∪ 子菜单」的范围内且尚未落到其它可点击
		// 条目上（例如掠过父项右缘与子菜单之间的内边距窄带、分隔线或禁用项），就不收起子菜单。
		// 这样可避免处理器速度较快、鼠标移动事件过密时，用户还没把指针移到子菜单上，
		// 子菜单就被中途误关闭；只有明确移到其它条目或完全离开该范围时才收起。
		if (m_subOpen && !onSubmenuParent && index < 0 &&
		    (UiPointInRect(m_rect, fx, fy) || UiPointInRect(m_subRect, fx, fy)))
		{
			// 保持在父项高亮，视觉上指明子菜单的来源。
			if (m_hoverIndex != m_subParentIndex || m_hoverSwatch != -1)
			{
				m_hoverIndex = m_subParentIndex;
				m_hoverSwatch = -1;
				changed = true;
			}
			return changed;
		}

		if (index != m_hoverIndex || swatchIndex != m_hoverSwatch)
		{
			m_hoverIndex = index;
			m_hoverSwatch = swatchIndex;
			changed = true;
		}

		// `HEADER_ACTION` 的图标按钮单独跟踪悬停状态（用于高亮，其余标题区域不响应）。
		{
			int iconHover = -1;
			for (std::size_t itemIndex = 0; itemIndex < m_items.size(); ++itemIndex)
			{
				if (m_items[itemIndex].kind != MenuItemKind::HEADER_ACTION)
				{
					continue;
				}
				const gd::RectF icon = HeaderIconRect(static_cast<int>(itemIndex));
				if (icon.Width > 0.0f && UiPointInRect(icon, fx, fy))
				{
					iconHover = static_cast<int>(itemIndex);
					break;
				}
			}
			if (iconHover != m_hoverIconIndex)
			{
				m_hoverIconIndex = iconHover;
				changed = true;
			}
		}

		// 悬停到带子菜单的项 → 向右展开；移开到其它条目或离开菜单 → 收起。
		if (onSubmenuParent)
		{
			if (!m_subOpen || m_subParentIndex != index)
			{
				BuildSubLayout(index);
				changed = true;
			}
		}
		else if (m_subOpen)
		{
			CloseSubmenu();
			changed = true;
		}
		return changed;
	}

	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;
		}

		// 子菜单内的按下：记录待确认项，待抬起时提交。
		if (m_subOpen && UiPointInRect(m_subRect, static_cast<float>(x), static_cast<float>(y)))
		{
			m_subPressedIndex = SubItemAtPoint(x, y);
			m_pressedIndex = -1;
			m_pressedSwatch = -1;
			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);
		}

		// 可滚动菜单的滚动条：按下即开始拖拽（不是条目点击，菜单保持打开）。
		if (m_scrollEnabled)
		{
			const gd::RectF thumb = ScrollBarThumbRect();
			if (thumb.Width > 0.0f && UiPointInRect(thumb, static_cast<float>(x), static_cast<float>(y)))
			{
				// 抓住滑块：记录抓取偏移，拖动时按“指针 − 偏移”重算偏移量。
				m_scrollBarDragging = true;
				m_scrollBarGrabOffset = static_cast<float>(y) - thumb.Y;
				m_pressedIndex = -1;
				m_pressedSwatch = -1;
				RebuildLayout();
				return true;
			}
			if (UiPointInRect(m_scrollBarRect, static_cast<float>(x), static_cast<float>(y)))
			{
				// 点在轨道空白处：把滑块中心移到该处（翻页）。
				m_scrollBarDragging = true;
				m_scrollBarGrabOffset = thumb.Height * 0.5f;
				m_scrollOffset = ScrollOffsetForThumbTop(static_cast<float>(y) - m_scrollBarGrabOffset);
				m_pressedIndex = -1;
				m_pressedSwatch = -1;
				RebuildLayout();
				return true;
			}
		}

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

	bool PopupMenu::OnLButtonUp(int x, int y, MenuResult& result)
	{
		// 每次抬起都重新构造结果（编辑提交已在 `OnLButtonDown` 里通过 `EndItemEdit` 下发，
		// 这里不需要保留进入时的旧结果）。
		result = MenuResult();
		if (!m_open)
		{
			return false;
		}

		// 结束滚动条拖拽（不当作条目点击，菜单保持打开）。
		if (m_scrollBarDragging)
		{
			m_scrollBarDragging = false;
			m_pressedIndex = -1;
			m_pressedSwatch = -1;
			return true;
		}

		// 子菜单内的抬起：按下与抬起命中同一项才提交（菜单随之关闭）。
		if (m_subOpen && m_subPressedIndex >= 0)
		{
			const int subPressed = m_subPressedIndex;
			m_subPressedIndex = -1;
			if (UiPointInRect(m_subRect, static_cast<float>(x), static_cast<float>(y)) &&
			    SubItemAtPoint(x, y) == subPressed)
			{
				const MenuItem& item = m_subItems[static_cast<std::size_t>(subPressed)];
				if (item.kind == MenuItemKind::NORMAL || item.kind == MenuItemKind::SWATCHES)
				{
					result.valid = true;
					result.scope = m_scope;
					result.id = item.id;
					result.swatchIndex = -1;
					result.itemRect = m_subItemRects[static_cast<std::size_t>(subPressed)];
					Close();
				}
			}
			return true;
		}

		// 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;
			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)];

		// 子菜单父项：单击不下发命令，只保证子菜单处于展开状态。
		if (item.kind == MenuItemKind::SUBMENU)
		{
			if (!m_subOpen || m_subParentIndex != index)
			{
				BuildSubLayout(index);
			}
			return true;
		}

		// `HEADER_ACTION`：只有**点在右侧图标按钮上**才下发命令（标题区域不响应）；
		// 菜单保持打开（这是一个可反复使用的小按钮，如「还原系数」）。
		if (item.kind == MenuItemKind::HEADER_ACTION)
		{
			const gd::RectF icon = HeaderIconRect(index);
			if (icon.Width > 0.0f && UiPointInRect(icon, static_cast<float>(x), static_cast<float>(y)))
			{
				result.valid = true;
				result.scope = m_scope;
				result.id = item.id;
				result.swatchIndex = -1;
				result.itemRect = icon;
			}
			return true;
		}

		// 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;
		}

		// 带复选框的切换项（如镜像的水平/垂直）选择后**保持菜单打开**，便于连续勾选。
		if (item.keepOpen)
		{
			return true;
		}

		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:
			// Esc 先收起展开的二级子菜单，再次按下才关闭整个菜单。
			if (m_subOpen)
			{
				CloseSubmenu();
				return true;
			}
			Close();
			return true;
		case VK_LEFT:
			if (m_subOpen)
			{
				CloseSubmenu();
				return true;
			}
			break;
		case VK_RIGHT:
		{
			if (m_hoverIndex >= 0 &&
			    m_items[static_cast<std::size_t>(m_hoverIndex)].kind == MenuItemKind::SUBMENU)
			{
				BuildSubLayout(m_hoverIndex);
				return true;
			}
			break;
		}
		case VK_DOWN:
			if (m_subOpen && m_subItems.size() > 0)
			{
				const int count = static_cast<int>(m_subItems.size());
				m_subHoverIndex = (m_subHoverIndex + 1 + count) % count;
				return true;
			}
			MoveHover(1);
			return true;
		case VK_UP:
			if (m_subOpen && m_subItems.size() > 0)
			{
				const int count = static_cast<int>(m_subItems.size());
				m_subHoverIndex = (m_subHoverIndex - 1 + count) % count;
				return true;
			}
			MoveHover(-1);
			return true;
		case VK_RETURN:
		{
			// 子菜单展开且已有悬停项时，回车提交该项。
			if (m_subOpen && m_subHoverIndex >= 0 &&
			    m_subHoverIndex < static_cast<int>(m_subItems.size()))
			{
				const MenuItem& item = m_subItems[static_cast<std::size_t>(m_subHoverIndex)];
				if (item.kind == MenuItemKind::NORMAL && item.enabled)
				{
					result.valid = true;
					result.scope = m_scope;
					result.id = item.id;
					result.swatchIndex = -1;
					result.itemRect = m_subItemRects[static_cast<std::size_t>(m_subHoverIndex)];
					Close();
				}
				return true;
			}
			if (CommitHover(result))
			{
				Close();
			}
			return true;
		}
		default:
			break;
		}
		return true;
	}


} // namespace jdi