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/*
** planemask.c
**
** How to make a widget to choose a planemask.
**
** NOTE: This file uses static variables. Therefore, trying to use these
** functions to create more than one of these planemask choice things
** will fail in a big way.
*/
#include <X11/Xos.h>
#include <stdio.h>
#include <stdlib.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Xaw/Form.h>
#include <X11/Xaw/Label.h>
#include <X11/Xaw/Toggle.h>
#include "xgc.h"
static void choose_plane(Widget, caddr_t, caddr_t);
static unsigned long planemask;
static Widget *pm;
/* create_planemask_choice(w)
** -------------------------
** Inside w (a form widget), creates a bunch of little toggle buttons
** in a row, representing the planemask. There's also a label so
** the user knows what it is.
*/
void
create_planemask_choice(Widget w)
{
/* callback list for the toggle widgets */
static XtCallbackRec callbacklist[] = {
{(XtCallbackProc) choose_plane, NULL},
{NULL, NULL}
};
/* ArgList for the label */
static Arg labelargs[] = {
{XtNborderWidth, (XtArgVal) 0},
{XtNjustify, (XtArgVal) XtJustifyRight},
{XtNvertDistance, (XtArgVal) 4}
};
/* ArgList for the toggles */
static Arg pmargs[] = {
{XtNcallback, (XtArgVal) NULL},
{XtNhorizDistance, (XtArgVal) NULL},
{XtNfromHoriz, (XtArgVal) NULL},
{XtNwidth, (XtArgVal) 10},
{XtNheight, (XtArgVal) 10},
{XtNhighlightThickness,(XtArgVal) 1},
{XtNstate, (XtArgVal) True},
{XtNlabel, (XtArgVal) ""}
};
static Widget label; /* the label, of course */
static int *pminfo; /* contains integers saying which bit
a particular button is; sent to
choose_plane to tell it which
bit got changed */
int i, num_planes;
char buf[40];
char name[20];
num_planes = PlanesOfScreen(X.scr);
planemask = (1<<num_planes)-1;
snprintf(buf, sizeof buf, "planemask %lu",planemask);
interpret(buf);
/* Allocate space for stuff that we don't know the size of yet */
pm = (Widget *) malloc(num_planes * sizeof(Widget));
pminfo = (int *) malloc(num_planes * sizeof(int));
/* Make the label widget */
label = XtCreateManagedWidget("planemask",labelWidgetClass,w,
labelargs,XtNumber(labelargs));
pmargs[0].value = (XtArgVal) callbacklist;
for (i=0;i<num_planes;++i) { /* go through all the buttons */
if (i==0) { /* offset the first one from the label */
pmargs[1].value = (XtArgVal) 10;
pmargs[2].value = (XtArgVal) label;
}
else { /* put it directly to the right of the
last one, no space in between */
pmargs[1].value = (XtArgVal) -1;
pmargs[2].value = (XtArgVal) pm[i-1];
}
/* set its original state depending on the state of that bit
** of the planemask */
if (planemask & 1<<i)
pmargs[6].value = (XtArgVal) True;
else
pmargs[6].value = (XtArgVal) False;
snprintf(name, sizeof name, "planemask%d",i);
pminfo[i] = i; /* which bit we're on; this is needed in
choose_plane (the callback) */
callbacklist[0].closure = (caddr_t) &pminfo[i];
pm[i] = XtCreateManagedWidget(name,toggleWidgetClass,w,
pmargs,XtNumber(pmargs));
}
}
/* choose_plane(w,closure,call_data)
** ------------------------------------
** This function is called when the user toggles a toggle widget. It
** makes the appropriate change to the planemask and sends it off
** to interpret().
** Funny args are because it's a callback.
*/
/*ARGSUSED*/
static void
choose_plane(Widget w, caddr_t closure, caddr_t call_data)
{
int num; /* what number button it is */
Boolean on; /* is it currently on or off? */
char buf[80]; /* string to send to interpret() */
static Arg args[] = {
{XtNstate, (XtArgVal) NULL}
};
/* set up ArgList so that 'on' will contain the state */
args[0].value = (XtArgVal) &on;
num = * (int *) closure; /* we put it here back in the last function */
XtGetValues(w,args,XtNumber(args));
/* Modify the planemask appropriately */
if (on)
planemask |= 1<<num;
else
planemask &= ~(1<<num);
(void) snprintf(buf, sizeof buf, "planemask %lu\n",planemask);
interpret(buf);
}
/* update_planemask(mask)
** ----------------------
** Updates the display of the planemask so that it corresponds to mask.
*/
void
update_planemask(long mask)
{
int i; /* counter */
static Arg maskargs[] = { /* ArgList for setting toggle state */
{XtNstate, (XtArgVal) NULL}
};
/* First set the internal representation */
planemask = mask;
for (i = 0; i < PlanesOfScreen(X.scr); ++i) {
if (planemask & 1<<i) { /* if it's set, make it look that way */
maskargs[0].value = (XtArgVal) True;
}
else {
maskargs[0].value = (XtArgVal) False;
}
XtSetValues(pm[i],maskargs,XtNumber(maskargs));
}
}
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