typedef struct TkLabel TkLabel; /* * widgets that use the label code: *	label *	checkbutton *	button *	menubutton *	separator *	cascade *	radiobutton */ struct TkLabel{	char*		text;		/* Label value */	Image*		bitmap;		/* Bitmap to display */	TkImg*		img;	int			justify;	int			anchor;//	int			flags;		/* justify/anchor */	int		w;	int		h;	int		textheight; 	/* button fields */	char*		command;	/* Command to execute at invoke */	char*		value;		/* Variable value in radio button */	char*		offvalue;		/* Off value for check button */	char*		variable;		/* Variable name in radio button */	int		ul;	int		check;		/* check/radiobutton/choicebutton state */	int		indicator;		/* -indicatoron setting */	char*		menu; 	char**	values;	int nvalues;	/* current value of choicebutton is represented by check */}; /* Layout constants */enum {	Textpadx	= 3,	Textpady	= 0,	Bitpadx	= 0,	/* Bitmap padding in labels */	Bitpady	= 0,	CheckButton	= 10,	CheckButtonBW	= 1,	ButtonBorder	= 4,	CheckSpace = CheckButton + 2*CheckButtonBW + 2*ButtonBorder,}; extern	TkOption	tkbutopts[];extern	TkOption	tkradopts[];extern	TkOption	tkcbopts[]; /* label.c */extern	void		tksizelabel(Tk*);extern	char*	tkdrawlabel(Tk*, Point);extern	void		tkfreelabel(Tk*);extern	void		tklabelgetimgs(Tk*, Image**, Image**);extern	char*	tksetvar(TkTop*, char*, char*); /* buton.c */extern	Tk*	tkmkbutton(TkTop*, int);extern	void	tksizebutton(Tk*);extern	char*	tkdrawbutton(Tk*, Point);extern	char*	tkbuttoninvoke(Tk*, char*, char**);extern	char*	tkradioinvoke(Tk*, char*, char**);extern	void		tkfreebutton(Tk*); /* support for menus */extern	int		tklabelmargin(Tk*);extern	int		tkbuttonmargin(Tk*);