/*	Public domain	*/

#ifndef _AGAR_GUI_SCROLLBAR_H_
#define _AGAR_GUI_SCROLLBAR_H_

#include <agar/gui/widget.h>
#include <agar/gui/begin.h>

enum ag_scrollbar_type {
	AG_SCROLLBAR_HORIZ,
	AG_SCROLLBAR_VERT
};

enum ag_scrollbar_button {
	AG_SCROLLBAR_BUTTON_NONE,
	AG_SCROLLBAR_BUTTON_DEC,
	AG_SCROLLBAR_BUTTON_INC,
	AG_SCROLLBAR_BUTTON_SCROLL
};

typedef struct ag_scrollbar {
	struct ag_widget wid;          /* AG_Widget -> AG_Scrollbar */
	Uint flags;
#define AG_SCROLLBAR_HFILL  0x01
#define AG_SCROLLBAR_VFILL  0x02
#define AG_SCROLLBAR_SMOOTH 0x04       /* Animated seek (default = jump) */
#define AG_SCROLLBAR_TEXT   0x08       /* Deprecated (unused) flag */
#define AG_SCROLLBAR_EXCL   0x40       /* Has exclusive access to bindings */
#define AG_SCROLLBAR_EXPAND (AG_SCROLLBAR_HFILL | AG_SCROLLBAR_VFILL)

	enum ag_scrollbar_type type;   /* Horizontal or vertical */

	enum ag_scrollbar_button curBtn;        /* Active button */
	enum ag_scrollbar_button mouseOverBtn;  /* Mouseover button */

	int length;                     /* Length of scrolling control area */
	int lbl1, lbl2;                 /* Arrow labels */
	int value;			/* Default `value' binding */
	AG_Event *_Nullable buttonIncFn; /* Alt. handler for increment btns */
	AG_Event *_Nullable buttonDecFn; /* Alt. handler for decrement btns */
	AG_Timer moveTo;		/* Timer for scrolling control */
	int xOffs, xSeek;		/* Cursor offset for scrolling */
} AG_Scrollbar;

#define   AGSCROLLBAR(obj)      ((AG_Scrollbar *)(obj))
#define  AGcSCROLLBAR(obj)      ((const AG_Scrollbar *)(obj))
#define  AG_SCROLLBAR_ISA(o)    (((AGOBJECT(o)->cid & 0xff000000) >> 24) == 0x20)
#define  AG_SCROLLBAR_SELF()    AGSCROLLBAR(  AG_OBJECT(0,         "AG_Widget:AG_Scrollbar:*") )
#define  AG_SCROLLBAR_PTR(n)    AGSCROLLBAR(  AG_OBJECT((n),       "AG_Widget:AG_Scrollbar:*") )
#define  AG_SCROLLBAR_NAMED(n)  AGSCROLLBAR(  AG_OBJECT_NAMED((n), "AG_Widget:AG_Scrollbar:*") )
#define AG_cSCROLLBAR_SELF()   AGcSCROLLBAR( AG_cOBJECT(0,         "AG_Widget:AG_Scrollbar:*") )
#define AG_cSCROLLBAR_PTR(n)   AGcSCROLLBAR( AG_cOBJECT((n),       "AG_Widget:AG_Scrollbar:*") )
#define AG_cSCROLLBAR_NAMED(n) AGcSCROLLBAR( AG_cOBJECT_NAMED((n), "AG_Widget:AG_Scrollbar:*") )

__BEGIN_DECLS
extern AG_WidgetClass agScrollbarClass;

AG_Scrollbar *_Nonnull AG_ScrollbarNewHoriz(void *_Nullable, Uint);
AG_Scrollbar *_Nonnull AG_ScrollbarNewVert(void *_Nullable, Uint);
AG_Scrollbar *_Nonnull AG_ScrollbarNew(void *_Nullable, enum ag_scrollbar_type,
                                       Uint);

void AG_ScrollbarSetIncFn(AG_Scrollbar *_Nonnull,
                         _Nullable AG_EventFn, const char *_Nullable, ...);
void AG_ScrollbarSetDecFn(AG_Scrollbar *_Nonnull,
                         _Nullable AG_EventFn, const char *_Nullable, ...);

int AG_ScrollbarIsUseful(AG_Scrollbar *_Nonnull);
int AG_ScrollbarWidth(AG_Scrollbar *_Nonnull) _Pure_Attribute_If_Unthreaded;
__END_DECLS

#include <agar/gui/close.h>
#endif /* _AGAR_GUI_SCROLLBAR_H_ */