WindowServer+LibGUI: Add support for nested menus

It's now possible to add a GMenu as a submenu of another GMenu.
Simply use the GMenu::add_submenu(NonnullOwnPtr<GMenu>) API :^)

The WindowServer now keeps track of a stack of open menus rather than
just one "current menu". This code needs a bit more work, but the basic
functionality is now here!

1 files changed, 7 insertions, 0 deletions

diff --git a/Servers/WindowServer/WSMenuItem.h b/Servers/WindowServer/WSMenuItem.h
index 27b9595222..fe334b3c0d 100644
--- a/Servers/WindowServer/WSMenuItem.h
+++ b/Servers/WindowServer/WSMenuItem.h
@@ -44,6 +44,12 @@ public:
     const GraphicsBitmap* icon() const { return m_icon; }
     void set_icon(const GraphicsBitmap* icon) { m_icon = icon; }
 
+    bool is_submenu() const { return m_submenu_id != -1; }
+    int submenu_id() const { return m_submenu_id; }
+    void set_submenu_id(int submenu_id) { m_submenu_id = submenu_id; }
+
+    WSMenu* submenu();
+
 private:
     WSMenu& m_menu;
     Type m_type { None };
@@ -55,4 +61,5 @@ private:
     String m_shortcut_text;
     Rect m_rect;
     RefPtr<GraphicsBitmap> m_icon;
+    int m_submenu_id { -1 };
 };