haiku/headers/private/interface/MenuPrivate.h

/*
 * Copyright 2006-2011, Haiku, Inc.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 * 		Stefano Ceccherini (stefano.ceccherini@gmail.com)
 */

#ifndef __MENU_PRIVATE_H
#define __MENU_PRIVATE_H

#include <Menu.h>

enum menu_states {
	MENU_STATE_TRACKING = 0,
	MENU_STATE_TRACKING_SUBMENU = 1,
	MENU_STATE_KEY_TO_SUBMENU = 2,
	MENU_STATE_KEY_LEAVE_SUBMENU = 3,
	MENU_STATE_CLOSED = 5
};


class BBitmap;
class BMenu;
class BWindow;

namespace BPrivate {

extern const char *kEmptyMenuLabel;
	
class MenuPrivate {
public:
	MenuPrivate(BMenu *menu);
	
	menu_layout Layout() const;

			void	ItemMarked(BMenuItem *item);
			void	CacheFontInfo();
	
			float	FontHeight() const;
			float	Ascent() const;
			BRect	Padding() const;
			void	GetItemMargins(float *, float *, float *, float *) const;

			int		State(BMenuItem **item = NULL) const;
	
			void	Install(BWindow *window);
			void	Uninstall();
			void	SetSuper(BMenu *menu);
			void	SetSuperItem(BMenuItem *item);
			void	InvokeItem(BMenuItem *item, bool now = false);	
			void	QuitTracking(bool thisMenuOnly = true);
	
	static	status_t	CreateBitmaps();
	static	void		DeleteBitmaps();

	static	const	BBitmap *MenuItemShift();
	static	const	BBitmap *MenuItemControl();
	static	const	BBitmap *MenuItemOption();
	static	const	BBitmap *MenuItemCommand();
	static	const	BBitmap *MenuItemMenu();
private:
	BMenu *fMenu;

	static BBitmap *sMenuItemShift;
	static BBitmap *sMenuItemControl;
	static BBitmap *sMenuItemOption;
	static BBitmap *sMenuItemAlt;
	static BBitmap *sMenuItemMenu;

};


};


// Note: since sqrt is slow, we don't use it and return the square of the distance
#define square(x) ((x) * (x))
static inline float
point_distance(const BPoint &pointA, const BPoint &pointB)
{
	return square(pointA.x - pointB.x) + square(pointA.y - pointB.y);
}

#undef square


#endif // __MENU_PRIVATE_H