boot loader: Menu[Item] API improvements

* Make Menu and MenuItem polymorphic.
* MenuItem:
  - Make SetMarked() virtual, so it can be overridden.
  - Add SetSubmenu() and Supermenu().
  - Delete the submenu in the destructor.
* Menu:
  - Add Entered()/Exited() hooks. They frame the time the user navigates
    the menu or any of its submenus. The hooks allow for subclasses
    populating their item list dynamically.
  - Add SortItems().
* Update boot loader menu copyright text to include 2013, now that it is
  over soon. :-)

headers/private/kernel/boot/menu.h

@@ -30,12 +30,12 @@ class MenuItem : public DoublyLinkedListLinkImpl<MenuItem> {
 public:
 								MenuItem(const char* label = NULL,
 									Menu* subMenu = NULL);
-								~MenuItem();
+	virtual						~MenuItem();
 
 			void				SetTarget(menu_item_hook target);
 			menu_item_hook		Target() const { return fTarget; }
 
-			void				SetMarked(bool marked);
+	virtual	void				SetMarked(bool marked);
 			bool				IsMarked() const { return fIsMarked; }
 
 			void				Select(bool selected);
@@ -57,7 +57,11 @@ public:
 			char				Shortcut() const { return fShortcut; }
 
 			const char*			Label() const { return fLabel; }
+
 			Menu*				Submenu() const { return fSubMenu; }
+			void				SetSubmenu(Menu* subMenu);
+
+			Menu*				Supermenu() const { return fMenu; }
 
 private:
 			friend class Menu;
@@ -93,10 +97,13 @@ enum menu_type {
 class Menu {
 public:
 								Menu(menu_type type, const char* title = NULL);
-								~Menu();
+	virtual						~Menu();
 
 			menu_type			Type() const { return fType; }
 
+	virtual	void				Entered();
+	virtual	void				Exited();
+
 			void				Hide() { fIsHidden = true; }
 			void				Show() { fIsHidden = false; }
 			bool				IsHidden() const { return fIsHidden; }
@@ -131,6 +138,9 @@ public:
 			shortcut_hook		FindShortcut(char key) const;
 			MenuItem*			FindItemByShortcut(char key);
 
+			void				SortItems(bool (*less)(const MenuItem*,
+									const MenuItem*));
+
 			void				Run();
 
 private:

src/system/boot/loader/menu.cpp

@@ -51,21 +51,18 @@ MenuItem::MenuItem(const char *label, Menu *subMenu)
 	fIsEnabled(true),
 	fType(MENU_ITEM_STANDARD),
 	fMenu(NULL),
-	fSubMenu(subMenu),
+	fSubMenu(NULL),
 	fData(NULL),
 	fHelpText(NULL),
 	fShortcut(0)
 {
-	if (subMenu != NULL)
-		subMenu->fSuperItem = this;
+	SetSubmenu(subMenu);
 }
 
 
 MenuItem::~MenuItem()
 {
-	if (fSubMenu != NULL)
-		fSubMenu->fSuperItem = NULL;
-
+	delete fSubMenu;
 	free(const_cast<char *>(fLabel));
 }
 
@@ -175,6 +172,16 @@ MenuItem::SetShortcut(char key)
 }
 
 
+void
+MenuItem::SetSubmenu(Menu* subMenu)
+{
+	fSubMenu = subMenu;
+
+	if (fSubMenu != NULL)
+		fSubMenu->fSuperItem = this;
+}
+
+
 void
 MenuItem::SetMenu(Menu* menu)
 {
@@ -210,6 +217,18 @@ Menu::~Menu()
 }
 
 
+void
+Menu::Entered()
+{
+}
+
+
+void
+Menu::Exited()
+{
+}
+
+
 MenuItem*
 Menu::ItemAt(int32 index)
 {
@@ -397,6 +416,13 @@ Menu::FindItemByShortcut(char key)
 }
 
 
+void
+Menu::SortItems(bool (*less)(const MenuItem*, const MenuItem*))
+{
+	fItems.Sort(less);
+}
+
+
 void
 Menu::Run()
 {

src/system/boot/platform/generic/text_menu.cpp

@@ -209,7 +209,7 @@ draw_menu(Menu *menu)
 	print_centered(2, "Haiku Boot Loader");
 
 	console_set_color(kCopyrightColor, kBackgroundColor);
-	print_centered(4, "Copyright 2004-2012 Haiku Inc.");
+	print_centered(4, "Copyright 2004-2013 Haiku, Inc.");
 
 	if (menu->Title()) {
 		console_set_cursor(kOffsetX, kFirstLine - 2);
@@ -390,6 +390,7 @@ static void
 run_menu(Menu* menu)
 {
 	sMenuOffset = 0;
+	menu->Entered();
 	menu->Show();
 
 	draw_menu(menu);
@@ -481,6 +482,7 @@ run_menu(Menu* menu)
 	}
 
 	menu->Hide();
+	menu->Exited();
 }