Adding ToolTalk Code to the Xfontsel Files

The changes made to the Xfontsel files are described in Modifying the Xfontsel Application.

Example B–4 Modified Xfontsel.c File

#ifndef lint
static char Xrcsid[] = “$XConsortium:
 xfontsel.c,v 1.16 89/12/12 14:10:48 rws
 Exp $”;
#endif

...

#include <X11/Xaw/Viewport.h>
#include <X11/Xmu/Atoms.h>

/*
 * For the ToolTalk demonstration, add the 
 * following line to include
 * the ToolTalk header file:
 */
#include <desktop/tt_c.h>	
/* ToolTalk header file */

#define MIN_APP_DEFAULTS_VERSION 1

...

void SetCurrentFont();
Boolean IsXLFDFontName();

/*
 * For the ToolTalk demonstration, add the 
 * following lines to tell
 * Xfontsel how to handle a ToolTalk message:
 */
void dieFromToolTalkError();	
 /* Fail if error occurs */
void processToolTalkMessage();
 /* Process ToolTalk message */
void ReplyToMessage();	
		/* Reply to ToolTalk message */
Tt_message replymsg;											

typedef void (*XtProc)();

...

int matchingFontCount;
static Boolean anyDisabled = False;
Widget ownButton;
/*
 * For the ToolTalk demonstration, add the 
 * next line to add
 * the apply button to change the font:
 */
Widget applyButton;
		/* Add apply button */
Widget fieldBox;
/*
 * For the ToolTalk demonstration, add 
 * the next line to add
 * a command box to make the font change:
 */
Widget commandBox;		
		/* Make commandBox global */
Widget countLabel;

...

void main(argc, argv)
 unsigned int argc;
 char **argv;
{
 Widget topLevel, pane;

/*
 * For the ToolTalk demonstration, 
 * add the following lines:
 */
 int ttmark, ttfd;	
		/* ToolTalk mark, ToolTalk file descriptor */
 char *procid;				
		/* Process identifier */
 Tt_status ttrc;					
		/* ToolTalk status */

 topLevel = XtInitialize( NULL, 
 “XFontSel”, options, XtNumber(options),
			 &argc, argv );

...

 pane = XtCreateManagedWidget(“pane”
,panedWidgetClass,topLevel,NZ);
 {
/*
 * For the ToolTalk demonstration, 
 * make the command box widget
 * global; change the line
 * Widget commandBox, 
 * fieldBox, currentFontName, viewPort;
 * as follows:
 */
	Widget
 /* commandBox, fieldBox, currentFontName,*/ viewPort;

	commandBox = XtCreateManagedWidget(“commandBox
 ”,formWidgetClass,pane,NZ);
	{

...

	 ownButton =
		XtCreateManagedWidget(“ownButton”
,toggleWidgetClass,commandBox,NZ);
/*
 * For the ToolTalk demonstration, add the 
 * following lines to create
 * an apply button for the font change:
 */
	 applyButton =		
	 XtVaCreateManagedWidget(“applyButton”,
					commandWidgetClass,
					commandBox,
					XtNlabel, “apply”,
					XtNfromHoriz, ownButton,
					XtNleft, XtChainLeft,
					XtNright, XtChainLeft,
					0);

	 countLabel =
		XtCreateManagedWidget(“countLabel”
,labelWidgetClass,commandBox,NZ);

	 XtAddCallback(quitButton, XtNcallback, Quit,
 NULL);
	 XtAddCallback(ownButton,XtNcallback,
  OwnSelection,(XtPointer)True);
/*
 * For the ToolTalk demonstration, add the 
 * following line to notify
 * Xedit when the apply button has been pressed:
 */
	 XtAddCallback(applyButton, 
  XtNcallback,ReplyToMessage, NULL);
	}

	fieldBox = XtCreateManagedWidget(“fieldBox”,
 boxWidgetClass, pane, NZ);

...

 {
	int f;
	for (f = 0; f < FIELD_COUNT; f++) 
currentFont.value_index[f] = -1;
 }

 /*
  * For the ToolTalk demonstration, 
  * add the following lines
  * to make the top of stack the ToolTalk
  * session and set
  * it to be the default session.
  */
 ttmark = tt_mark();
 ttrc = tt_default_session_set( 
		/* set the default session .. */
 tt_X_session( 							
			/* .. to the X session for .. */
 DisplayString( 										
			/* .. the X server displaying ..*/
 XtDisplay(top)))); 							
			/* .. our top window... */
	  /*
 	  * Fail if no default session
	   */
 dieFromToolTalkError(“tt_default_session_set”
,ttrc);
 procid = tt_open();
	/*
	 * Fail if no proces identifier
	 */
 dieFromToolTalkError(“tt_open”
,tt_ptr_error(procid));
 ttfd = tt_fd();
	/*
	 * Fail if no ToolTalk file descriptor
	 */
 dieFromToolTalkError(“tt_fd”
,tt_int_error(ttfd));
 ttrc = tt_ptype_declare(“xfontsel”);
	/*
	 * Fail if ptype not declared
	 */
 dieFromToolTalkError(“tt_ptype_declare”
,tt_int_error(ttfd));
 ttrc = tt_session_join(tt_default_session());
	/*
	 * Fail if unable to join session
	 */
 dieFromToolTalkError(“tt_session_join”,ttrc);
	/*
 	 * Add input
	 */
 XtAddInput(ttfd, (XtPointer)XtInputReadMask,
 processToolTalkMessage, 0);

 XtAppMainLoop(appCtx);							

 tt_close();						
			/* End ToolTalk session */
 tt_release(ttmark);									
			/* Free space */
}

...
		Boolean field_bits[FIELD_COUNT];
		int max_field;
		if (*fontName == DELIM) field++;
/*
 *
 * For the ToolTalk demonstration, 
 * use the standard routines
 * instead of BSD; change the line
 * bzero( field_bits, sizeof(field_bits) );
 * to read as follows:
 *
 */
		memset( field_bits, 0, sizeof(field_bits) );
		if (Matches(pattern, fontName++, field_bits, 
   &max_field)) {

...

	 XtDisownSelection(w, XA_PRIMARY, time);
	XtSetSensitive(currentFontName, False);
 }

/*
 * For the ToolTalk Demonstration, 
 * add the following lines:
 */
}

void dieFromToolTalkError(procname, errid)		/* Fail if error occurs */
 char *procname;					
		/* Process name */
 Tt_status errid;							
		/* Error identifier */
{
	/*
	 * Don't die on warnings or TT_OK.
	 */

	if (tt_is_err(errid)) {
		fprintf(stderr,”%s returned ToolTalk error:
 %s\n”,
			procname, tt_status_message(errid));
		exit(1);
	}
}

void processToolTalkMessage()
	/* Process message */
{
	int ttmark;	
		/* ToolTalk mark */
	Tt_message incoming;				
			/* Incoming message */

	ttmark = tt_mark();

	incoming = tt_message_receive();
	/* Receive message */
	/*
	 * It's possible that the file descriptor 
  * may become active but
	 * there's not actually a ToolTalk message 
  * for us.
	 */
	if (incoming == 0) return;

	if (tt_is_err(tt_ptr_error(incoming))) {
		dieFromToolTalkError(“tt_message_receive”,
				 tt_ptr_error(incoming));
	}
	
	if (0==strcmp(tt_message_op(incoming),”
  GetFontName”)) {
		/*
		 * This is the message we expected. 
   * If we're already
		 * busy, reject it. Otherwise activate 
   * the “apply” button.
		 */
		if (replymsg) {
			tt_message_reject(incoming);
			tt_message_destroy(incoming);
			tt_release(ttmark);
			return;
		}
		XtVaSetValues(applyButton, XtNsensitive, 
   TRUE, 0);
		replymsg = incoming;
		tt_release(ttmark);
		return;
	}

	/*
	 * This is not a message we recognize.
	 * If it's a request, or a notice that 
  * caused us to start, fail it.
	 */

	if (tt_message_class(incoming) == TT_REQUEST ||
	 tt_message_status(incoming) == 
  TT_WRN_START_MESSAGE) {
		tt_message_fail(incoming);
	}
	tt_message_destroy(incoming);
	tt_release(ttmark);
}

/*
 * Called when the Apply button is pressed. 
 * Replies to the outstanding
 * message and turn off the Apply button.
 */

/* ARGSUSED */
void ReplyToMessage(w, msg, wdata)
 Widget w;
 caddr_t msg;
 caddr_t wdata;
{

	tt_message_arg_val_set(replymsg, 0, 
currentFontNameString);
	tt_message_reply(replymsg);
	tt_message_destroy(replymsg);
	replymsg = 0;
	XtVaSetValues(applyButton, XtNsensitive, FALSE,
 0);
}