/*

    Canvas.h - public header file for the Canvas Widget
    -  a widget that allows programmer-specified refresh procedures.
    Copyright (C) 1990,93,94 Robert H. Forsman Jr.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

#ifndef _Canvas_h
#define _Canvas_h

#include <X11/Core.h>

#ifndef XtNexposeProc
#define	XtNexposeProc		"exposeProc"
#define	XtCExposeProc		"ExposeProc"
#endif

#ifndef XtNexposeProcData
#define	XtNexposeProcData	"exposeProcData"
#define	XtCExposeProcData	"ExposeProcData"
#endif

#ifndef	XtNresizeProc
#define	XtNresizeProc		"resizeProc"
#define	XtCResizeProc		"ResizeProc"
#endif

#ifndef	XtNresizeProcData
#define	XtNresizeProcData	"resizeProcData"
#define	XtCResizeProcData	"ResizeProcData"
#endif

#ifndef XtNvisual
#define XtNvisual		"visual"
#define XtCVisual		"Visual"
#endif

#ifndef XtNBackPixmap
#define XtNBackPixmap		"backPixmap"
#define XtCBackPixmap		"BackPixmap"
#endif

extern WidgetClass xfwfcanvasWidgetClass;

typedef struct _CanvasClassRec *CanvasWidgetClass;
typedef struct _CanvasRec      *CanvasWidget;

typedef void(*XfwfCanvasExposeProc)(
#if NeedFunctionPrototypes
	Widget w,
	XExposeEvent *event,
	Region region,
	XtPointer client_data
#endif
);

typedef void(*XfwfCanvasResizeProc)(
#if NeedFunctionPrototypes
	Widget w,
	XtPointer client_data
#endif
);

Pixmap canvas_get_backpixmap(Widget w);
void canvas_copy_to_backpixmap(Widget w, Pixmap src);
void canvas_show(Widget w);
void canvas_hide(Widget w);

#endif /* _Canvas_h */