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/*
** testfrac.c
**
** How to make a widget to choose the fraction of tests to be run.
**
*/
#include <stdio.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Xaw/Form.h>
#include <X11/Xaw/Label.h>
#include <X11/Xaw/Scrollbar.h>
#include "xgc.h"
#define SCROLLBAR_LENGTH 125
#define SLIDER_LENGTH 0.2 /* proportion of scrollbar taken up
by the slider */
static Widget label; /* the label */
static Widget slider; /* the scrollbar */
static Widget percent; /* label with chosen percentage */
static float fraction; /* what percent has been chosen */
static int oldpercent = -1; /* so we only update when the slider has
been moved */
/* slider_jump(w,data,position)
** ----------------------------
** This function is called if the user moves the scrollbar to a new
** position (generally, by using the middle button). It updates
** information about where the scrollbar is.
*/
/*ARGSUSED*/
static void
slider_jump(Widget w, caddr_t data, caddr_t position)
{
static Arg percentargs[] = {
{XtNlabel, (XtArgVal) NULL}
};
float oldpercent; /* where the scrollbar is */
float newpercent; /* normalized scrollbar */
char snewpercent[4]; /* string representation of scrollbar */
oldpercent = *(float *) position;
/* We want the scrollbar to be at 100% when the right edge of the slider
** hits the end of the scrollbar, not the left edge. When the right edge
** is at 1.0, the left edge is at 1.0 - SLIDER_LENGTH. Normalize
** accordingly. */
newpercent = oldpercent / (1.0 - SLIDER_LENGTH);
/* If the slider's partially out of the scrollbar, move it back in. */
if (newpercent > 1.0) {
newpercent = 1.0;
XawScrollbarSetThumb( slider, 1.0 - SLIDER_LENGTH, SLIDER_LENGTH);
}
/* Store the position of the silder where it can be found */
*(float *)data = newpercent;
/* Update the label widget */
snprintf(snewpercent, sizeof snewpercent, "%d",(int)(newpercent*100));
percentargs[0].value = (XtArgVal) snewpercent;
XtSetValues(percent, percentargs, XtNumber(percentargs));
}
/* slider_scroll(w,data,position)
** ------------------------------
** This function is called when the user does incremental scrolling,
** generally with the left or right button. Right now it just ignores it.
*/
/*ARGSUSED*/
static void
slider_scroll(Widget w, caddr_t data, caddr_t position)
{
}
/*ARGSUSED*/
static void
update(Widget w, XEvent *event, String *params, int *num_params)
{
char buf[80];
int newpercent;
newpercent = (int)(fraction * 100.0);
if (newpercent != oldpercent) {
snprintf(buf, sizeof buf, "percent %d\n", (int)(fraction * 100.0));
interpret(buf);
oldpercent = newpercent;
}
}
/* create_testfrac_choice(w)
** -------------------------
** Inside w (a form widget), creates:
** 1. A label "Percentage of Test"
** 2. A scrollbar for the user to choose the percentage (from 0 to 100)
** 3. A label with the current percentage displayed on it.
** The percentage starts at 100.
**
** When the pointer leaves the scrollbar, a string is sent to interpret()
** so that it knows the position of the scrollbar.
*/
void
create_testfrac_choice(Widget w)
{
static XtCallbackRec jumpcallbacks[] = {
{(XtCallbackProc) slider_jump, NULL},
{NULL, NULL}
};
static XtCallbackRec scrollcallbacks[] = {
{(XtCallbackProc) slider_scroll, NULL},
{NULL, NULL}
};
static Arg labelargs[] = {
{XtNborderWidth, (XtArgVal) 0},
{XtNjustify, (XtArgVal) XtJustifyRight},
{XtNvertDistance, (XtArgVal) 4}
};
static Arg percentargs[] = {
{XtNhorizDistance, (XtArgVal) 10},
{XtNfromHoriz, (XtArgVal) NULL}
};
static Arg scrollargs[] = {
{XtNorientation, (XtArgVal) XtorientHorizontal},
{XtNlength, (XtArgVal) SCROLLBAR_LENGTH},
{XtNthickness, (XtArgVal) 10},
{XtNshown, (XtArgVal) 10},
{XtNhorizDistance, (XtArgVal) 10},
{XtNfromHoriz, (XtArgVal) NULL},
{XtNjumpProc, (XtArgVal) NULL},
{XtNscrollProc, (XtArgVal) NULL}
};
static const char *translationtable = "<Leave>: Update()";
static XtActionsRec actiontable[] = {
{"Update", (XtActionProc) update},
{NULL, NULL}
};
/* Let the scrollbar know where to store information where we
** can see it */
jumpcallbacks[0].closure = (caddr_t) &fraction;
label = XtCreateManagedWidget("Percentage of Test",labelWidgetClass,w,
labelargs,XtNumber(labelargs));
percentargs[1].value = (XtArgVal) label;
percent = XtCreateManagedWidget("100",labelWidgetClass,w,
percentargs,XtNumber(percentargs));
scrollargs[5].value = (XtArgVal) percent;
scrollargs[6].value = (XtArgVal) jumpcallbacks;
scrollargs[7].value = (XtArgVal) scrollcallbacks;
slider = XtCreateManagedWidget("Slider",scrollbarWidgetClass,w,
scrollargs,XtNumber(scrollargs));
XtAppAddActions(appcontext,actiontable,XtNumber(actiontable));
XtOverrideTranslations(slider,XtParseTranslationTable(translationtable));
/* Start the thumb out at 100% */
XawScrollbarSetThumb(slider, 1.0 - SLIDER_LENGTH, SLIDER_LENGTH);
}
void
update_slider(int newpercent)
{
fraction = (float) newpercent / 100.0;
XawScrollbarSetThumb(slider, fraction / (1.0-SLIDER_LENGTH), SLIDER_LENGTH);
}
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