Category : Files from Magazines
Archive   : NOV92_1.ZIP
Filename : WIDGET.ASC

_DEBUGGING MOTIF WIDGETS_
by Kamran Husain

[LISTING ONE]

/* This code is given as an example of sorts for you to write your own Motif
** application. Compile this program with the line:
** acc -g test.c -o testme LineChart.o BarChart.o -lXm -lXt -lX11 -lm
** where
** acc - is the ANSI compiler at your site
** -g - is the debug option (optional)
** -o - specifies the output executable filename
** -lXm - is the Motif Library
** -lXt - is the Intrinsics Library
** -lX11 - is the X11 Library
** -lm - math library.
** LineChart.o and BarChart.o are object files from the
** sources available electronically from Dr Dobbs.
** If you want to step thru this code in a debugger and examine the internals
** of the Widgets themselves, replace the next #include "LineChart.h" line
** outside the comments with
** #include "BarChartP.h"
** #include "BarChart.h"
** #include "LineChartP.h"
** #include "LineChart.h"
*/

/* Some standard include files here. */
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "LineChart.h"

/* A macro to facilitate button placement on a form. The x,y are the top left
** corner on the form. The w is the right position relative to the form's left
** side the h is the bottom position relative to the form's top side */
#define MAKE_BTN_ON_FORM(form,btn,x,y,w,h,str) \
n = 0; \
XtSetArg(wars[n], XmNleftAttachment, XmATTACH_POSITION ); n++; \
XtSetArg(wars[n], XmNtopAttachment, XmATTACH_POSITION ); n++; \
XtSetArg(wars[n], XmNbottomAttachment, XmATTACH_POSITION ); n++; \
XtSetArg(wars[n], XmNrightAttachment, XmATTACH_POSITION ); n++; \
XtSetArg(wars[n], XmNrightPosition, (x+w)); n++; \
XtSetArg(wars[n], XmNleftPosition, (x)); n++; \
XtSetArg(wars[n], XmNtopPosition, (y)); n++; \
XtSetArg(wars[n], XmNbottomPosition, (h+y)); n++; \
btn = XmCreatePushButton(form,str,wars,n); \
XtManageChild(btn)
/* Remove the comments below to enable some debug levels.
#define DEBUG_SWAPPING_SCREENS
#define DEBUG_LIMITS
#define DEBUG_SI_COUNTER
*/
#define ScrnWidth 500
#define ScrnHt 400
#define MAXITEMS 10
Widget mainShell, /* Application shell */
mainForm, /* Master form */
plotLChart, /* Line Chart Widget */
plotBChart, /* Bar Chart Widget */
otherPBtn, /* Toggle Push Button */
advancePBtn, /* Advance Data in Lists Push Button */
donePBtn; /* Exit Push Button */
/* Pixels are stored in these. */
unsigned long WhiteColor,
BlackColor,
BlueColor,
RedColor,
GreenColor;

/* Storage Area for the dummy data.
int dummyOne[MAXITEMS] = { -10. -5, 0, 15, 20, 15 ,0, -5, -10, -5 };
int dummyTwo[MAXITEMS] = { 4, 13, 13, 10 ,11, 9, 4, -11, -13, -11 };
*/
static int siCounter = MAXITEMS - 1;
int one[MAXITEMS];
int two[MAXITEMS];
/* Declare the functions and callbacks here. Note that I do not use any
** parameters into the callbacks. Please refer to the Motif manual for
** details on these parameters if you need to use them. */
void exitCB();
int toggleCB();
int advanceCB();
void createDummyData(int count, int *oneptr, int *twoptr);
unsigned long str2pix(char *spec, Widget w);
int main(int argc, char *argv[])
{
Arg wars[24]; /* for argument passing */
XGCValues gcv; /* for creation for GC */
XtGCMask gcmask; /* for GC flags */
char strName[24]; /* Dummy storage area */
int FormHt = 88; /* On the main form */
int margin = 10; /* Distance between buttons */
int dw = 20; /* Width of each button */
int dh = 10; /* Height of each button */
int h1 = margin; /* temporary var initialize */
int h2; /* temporary variables */
int DispHt, DispWd, ivalue, n, i, imax, imin, imid;
/* Initialize toolkit */
mainShell = XtInitialize(argv[0],"Demo", NULL, NULL, &argc, argv) ;
n =0;
XtSetArg(wars[n], XmNwidth, ScrnWidth); n++;
XtSetArg(wars[n], XmNheight, ScrnHt); n++;
XtSetArg(wars[n], XmNiconic, False ); n++;
XtSetArg(wars[n], XmNiconName, "TestMe"); n++;
XtSetValues(mainShell,wars,n);
XtRealizeWidget(mainShell);
/* Place the Form on the Shell. */
n=0;
XtSetArg(wars[n], XmNwidth, ScrnWidth); n++;
XtSetArg(wars[n], XmNheight, ScrnHt); n++;
mainForm = XmCreateForm(mainShell,"mainForm",wars,n);
XtManageChild( mainForm );
/* Use macros to place PushButtons on Form. Attach callbacks too. */
MAKE_BTN_ON_FORM(mainForm,otherPBtn,h1,FormHt,dw,dh,"Toggle");
h2 = h1 + margin + dw;
MAKE_BTN_ON_FORM(mainForm,advancePBtn,h2,FormHt,dw,dh,"Advance");
h2 += margin + dw;
MAKE_BTN_ON_FORM(mainForm,donePBtn,h2,FormHt,dw,dh,"Done");
XtAddCallback(otherPBtn,XmNactivateCallback, toggleCB, NULL);
XtAddCallback(advancePBtn,XmNactivateCallback, advanceCB, NULL);
XtAddCallback(donePBtn,XmNactivateCallback, exit, NULL);
createDummyData(MAXITEMS, one, two);
/* Calculate extents of this dummy data. */
imax = -100; imin = 100;
for (i=0; i< MAXITEMS;i++)
{
ivalue = one[i];
if (imax < ivalue) imax = ivalue;
if (imin > ivalue) imin = ivalue;
ivalue = two[i];
if (imax < ivalue) imax = ivalue;
if (imin > ivalue) imin = ivalue;
}
imid = imin + 1;
#ifdef DEBUG_LIMITS
/* Tell the user where you are. */
printf("\n Min = %d Mid = %d Max = %d", imin,imid,imax);
#endif
/* Allocate the colors here. */
WhiteColor = str2pix("White", mainForm);
BlackColor = str2pix("Black", mainForm);
BlueColor = str2pix("Blue", mainForm);
RedColor = str2pix("Red", mainForm);
GreenColor = str2pix("Green", mainForm);
sprintf(strName,"%d,%d",imax,imin);
/* Define and declare the Line Chart Widget. */
n = 0;
XtSetArg(wars[n], XmNheight, DispHt); n++;
XtSetArg(wars[n], XmNwidth, DispWd); n++;
XtSetArg(wars[n], XmNleftAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNrightAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNtopAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNbottomAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNleftPosition, 5 ); n++;
XtSetArg(wars[n], XmNrightPosition, 95); n++;
XtSetArg(wars[n], XmNtopPosition, 5 ); n++;
XtSetArg(wars[n], XmNbottomPosition, 75 ); n++;
XtSetArg(wars[n], XmNforeground, BlackColor); n++;
XtSetArg(wars[n], XmNbackground, WhiteColor); n++;
XtSetArg(wars[n], XtNitems, one); n++;
XtSetArg(wars[n], XtNauxItems, two); n++;
XtSetArg(wars[n], XtNitemCount, MAXITEMS); n++;
XtSetArg(wars[n], XtNmaxItemCount, MAXITEMS); n++;
XtSetArg(wars[n], XtNmaxValue, imax); n++;
XtSetArg(wars[n], XtNmidValue, imid); n++;
XtSetArg(wars[n], XtNminValue, imin); n++;
XtSetArg(wars[n], XtNzeroColor, BlueColor); n++;
XtSetArg(wars[n], XtNpositiveColor, BlueColor); n++;
XtSetArg(wars[n], XtNnegativeColor, RedColor); n++;
plotLChart = XtCreateWidget("LineChartType",
XvlinechartWidgetClass, mainForm, wars, n);
imid = (imax + imin) / 2;
#ifdef DEBUG_LIMITS
printf("\n Min = %d Mid = %d Max = %d", imin,imid,imax);
#endif
/* Define and declare the Bar Chart Widget. */
n = 0;
XtSetArg(wars[n], XmNheight, DispHt); n++;
XtSetArg(wars[n], XmNwidth, DispWd); n++;
XtSetArg(wars[n], XmNforeground, BlackColor); n++;
XtSetArg(wars[n], XmNbackground, WhiteColor); n++;
XtSetArg(wars[n], XmNleftAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNrightAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNtopAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNbottomAttachment, XmATTACH_POSITION ); n++;
XtSetArg(wars[n], XmNleftPosition, 5 ); n++;
XtSetArg(wars[n], XmNrightPosition, 95); n++;
XtSetArg(wars[n], XmNtopPosition, 5 ); n++;
XtSetArg(wars[n], XmNbottomPosition, 75 ); n++;
XtSetArg(wars[n], XtNitems, one); n++;
XtSetArg(wars[n], XtNauxItems, two); n++;
XtSetArg(wars[n], XtNitemCount, MAXITEMS); n++;
XtSetArg(wars[n], XtNmaxItemCount, MAXITEMS); n++;
XtSetArg(wars[n], XtNmaxValue, imax); n++;
XtSetArg(wars[n], XtNmidValue, imid); n++;
XtSetArg(wars[n], XtNminValue, imin); n++;
XtSetArg(wars[n], XtNmaxShowValue, imax); n++;
XtSetArg(wars[n], XtNminShowValue, imin); n++;
XtSetArg(wars[n], XtNzeroColor, BlueColor); n++;
XtSetArg(wars[n], XtNpositiveColor, BlueColor); n++;
XtSetArg(wars[n], XtNnegativeColor, RedColor); n++;
plotBChart = XtCreateManagedWidget("BarChartDisplay",
XvbarchartWidgetClass, mainForm, wars, n);
/* Show the widgets on the form and go into a loop */
XtManageChild(mainForm);
XtRealizeWidget(mainShell);
XtMainLoop();
}
/* Terminate the application. */
void exitCB()
{
exit(0);
}
/* It's easier to use a flag here instead of calling XtIsManaged() on every
** widget. This flag could index a circular list of Widgets and thus your
** ToggleCB() function would go something like:
** ...
** XtUnmanage(YourList[ToggleFlag]);
** ToggleFlag++;
** if (ToggleFlag >= LengthOfList) ToggleFlag =0;
** XtManage(YourList[ToggleFlag]);
** ...
** where "YourList" is an array of widgets of length "LengthOfList". */
static ToggleFlag = 1;
/* Callback for function to toggle the type of display. */
int toggleCB()
{
if (ToggleFlag)
{
#ifdef DEBUG_SWAPPING_SCREENS
printf("\n Debug statement goes here ");
#endif
XtUnmanageChild(plotBChart);
XtManageChild(plotLChart);
ToggleFlag = 0;
}
else {
#ifdef DEBUG_SWAPPING_SCREENS
printf("\n Debug statement goes here ");
#endif
XtManageChild(plotBChart);
XtUnmanageChild(plotLChart);
ToggleFlag = 1;
}
}
/* Convenience to load in colors for the application. Returns pixel value
** given the following inputs: char *spec; color name
** Widget w; a widget pointer
*/
unsigned long str2pix(char *spec, Widget w)
{
Colormap cmap;
XColor color_struct; /* For this color */
Display *dpy; /* Curent display */
static void *ht = NULL; /* hash table pointer */
/* Get Display */
dpy = XtDisplay(w);
/* Get color map */
cmap = XDefaultColormap(dpy, DefaultScreen(dpy));
/* Parse the color specification */
if (!XParseColor(dpy, cmap, spec, &color_struct))
{
printf("Invalid color name (%s)\n",spec);
exit(1);
}
/* Try to allocate the color */
if (!XAllocColor(dpy, cmap, &color_struct))
{
printf("Cannot allocate color in colormap\n");
exit(1);
}
/* Return the allocated color */
return(color_struct.pixel);
}
/* Cycle the data thru itself when button is pressed on "Advance" */
int advanceCB()
{
if (siCounter < 1) siCounter = MAXITEMS;
#ifdef DEBUG_SI_COUNTER
printf("\n siCounter = %d", siCounter);
#endif
siCounter--;
XvBarChartAddItem(plotLChart, one[siCounter]);
XvBarChartAddItem(plotBChart, two[siCounter]);
}
/* Create some data in an array. */
void createDummyData(int count, int *oneptr, int *twoptr)
{
int i;
for (i = 0; i < count/2; i++)
{
oneptr[i] = (i * 2) + 10;
twoptr[i] = (i * 3) + 5;
}
for (i = count/2; i < count; i++)
{
oneptr[i] = (i * 2) - 10;
twoptr[i] = (i * 3) - 5;
}
}