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/*
Canvas.c - 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.
*/
#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <stdio.h>
#include "CanvasP.h"
#define offset(field) XtOffset(CanvasWidget, canvas.field)
static XtResource resources[] = {
{XtNexposeProc, XtCExposeProc, XtRFunction, sizeof(XfwfCanvasExposeProc),
offset(redraw), XtRFunction, NULL},
{XtNexposeProcData, XtCExposeProcData, XtRPointer, sizeof(XtPointer),
offset(redraw_data), XtRFunction, NULL},
{XtNresizeProc, XtCResizeProc, XtRFunction, sizeof(XfwfCanvasResizeProc),
offset(resize), XtRFunction, NULL},
{XtNresizeProcData, XtCResizeProcData, XtRPointer, sizeof(XtPointer),
offset(resize_data), XtRFunction, NULL},
{XtNvisual, XtCVisual, XtRVisual, sizeof(Visual*),
offset(visual), XtRImmediate, CopyFromParent}
};
static void CanvasRealize();
static void Redisplay();
static void Resize();
static Boolean SetValues();
CanvasClassRec canvasClassRec = {
{
/* core_class fields */
/* superclass */ (WidgetClass) &widgetClassRec,
/* class_name */ "Canvas",
/* widget_size */ sizeof(CanvasRec),
/* class_initialize */ NULL,
/* class_part_initialize */ NULL,
/* class_inited */ False,
/* initialize */ NULL,
/* initialize_hook */ NULL,
/* realize */ CanvasRealize,
/* actions */ NULL,
/* num_actions */ 0,
/* resources */ resources,
/* num_resources */ XtNumber(resources),
/* xrm_class */ NULLQUARK,
/* compress_motion */ True,
/* compress_exposure */ XtExposeCompressMultiple,
/* compress_enterleave */ True,
/* visible_interest */ True,
/* destroy */ NULL,
/* resize */ Resize,
/* expose */ Redisplay,
/* set_values */ SetValues,
/* set_values_hook */ NULL,
/* set_values_almost */ XtInheritSetValuesAlmost,
/* get_values_hook */ NULL,
/* accept_focus */ NULL,
/* version */ XtVersion,
/* callback_private */ NULL,
/* tm_table */ NULL,
/* query_geometry */ NULL,
/* display_accelerator */ XtInheritDisplayAccelerator,
/* extension */ NULL
},
{
0 /* some stupid compilers barf on empty structures */
},
};
WidgetClass xfwfcanvasWidgetClass = (WidgetClass) & canvasClassRec;
static void CanvasRealize(widget, value_mask, attributes)
Widget widget;
XtValueMask *value_mask;
XSetWindowAttributes *attributes;
{
CanvasWidget cw = (CanvasWidget)widget;
XtCreateWindow(widget, (unsigned int) InputOutput,
(Visual *) cw->canvas.visual, *value_mask, attributes);
} /* CoreRealize */
static void Redisplay(w, event, region)
Widget w;
XExposeEvent *event;
Region region;
{
CanvasWidget cw = (CanvasWidget)w;
if (!XtIsRealized(w))
return;
if (cw->canvas.redraw)
(cw->canvas.redraw)((Widget)cw,event,region,cw->canvas.redraw_data);
}
static Boolean SetValues(current, request, new, args, nargs)
CanvasWidget current, request, new;
ArgList args;
Cardinal *nargs;
{
int i;
for(i=0; i<*nargs; i++) {
if (strcmp(XtNexposeProc,args[i].name)==0 ||
strcmp(XtNexposeProcData,args[i].name)==0)
return True;
}
return False;
}
static void Resize(cw)
CanvasWidget cw;
{
if (cw->canvas.resize)
(cw->canvas.resize)((Widget)cw, cw->canvas.resize_data);
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.