kochhar@endor.harvard.edu (Sandeep Kochhar) (08/17/89)
Hi!
since I've received a few requests for accelerator examples,
here's an example of using accelerators -- it's a complete
program that shows how to modify the athena dialog widget
to accept a carriage return as equivalent to the first button.
Note: 1. Thanks to other people who earlier provided me examples.
2. The program below just needs to be compiled with -lXaw -lXt -lXmu -lX11
3. The code was extracted from another program; so it's probably not
particulary elegant...
Thanks.
------------------cut here--------------------------
/* An example of using accelerators */
/* This example takes the Athena Dialog Wiget and adds */
/* accelerators to allow a carriage return anywhere in the */
/* dialog box to be equivalent to clicking on the first button */
/* -- sandeep kochhar */
#include <stdio.h>
#include <X11/Intrinsic.h>
#include <X11/Cardinals.h>
#include <X11/StringDefs.h>
#include <X11/Shell.h>
#include <X11/Dialog.h>
#include <X11/IntrinsicP.h>
#include <X11/CommandP.h>
#include <X11/Command.h>
#define STR_LEN 80
static Display *display; /* for drawing etc. */
#define MAX_ARGS 5
static Arg args[MAX_ARGS];
static char buf[80];
static Widget Gr_toplevel;
static Widget Gr_dial;
static Widget Gr_ok;
static Widget Gr_canceled;
static Widget dial_value; /* label child of dialog */
static void dial_selected(); /* forward declarations */
static void dial_canceled(); /* forward declarations */
/* layout info */
void init_gr()
{
int arg_count = 0;
String src = "#override \n<Key>Return: set() notify() unset()\n\
<Key>Linefeed: set() notify() unset()";
String dest = "<Key>Return: \n <Key>Linefeed: \n";
strcpy(buf, "hello");
Gr_toplevel = XtCreateApplicationShell("datasurf", topLevelShellWidgetClass,
NULL, ZERO);
XtSetArg(args[arg_count], XtNlabel, "Enter Value:"); arg_count++;
XtSetArg(args[arg_count], XtNvalue, buf); arg_count++;
XtSetArg(args[arg_count], XtNmaximumLength, 79); arg_count++;
Gr_dial = XtCreateManagedWidget("dial", dialogWidgetClass,
Gr_toplevel, args, arg_count);
XtOverrideTranslations(Gr_dial, XtParseTranslationTable(dest));
arg_count = 0;
XtSetArg(args[arg_count], XtNborderWidth, 2); arg_count++;
XtSetArg(args[arg_count], XtNaccelerators,
XtParseAcceleratorTable(src)); arg_count++;;
Gr_ok = XtCreateManagedWidget("ok", commandWidgetClass,
Gr_dial, args, arg_count);
XtAddCallback(Gr_ok, XtNcallback, dial_selected, NULL);
arg_count = 0;
Gr_canceled = XtCreateManagedWidget("canceled", commandWidgetClass,
Gr_dial, args, arg_count);
XtAddCallback(Gr_canceled, XtNcallback, dial_canceled, NULL);
/* adding new stuff for newline etc */
dial_value = XtNameToWidget(Gr_dial, "value");
if (!dial_value) { printf("Dial_value Oops!\n"); exit(1); }
arg_count = 0;
XtSetArg(args[arg_count], XtNvalue, "foobar"); arg_count++;
XtSetValues(dial_value, args, arg_count);
XtOverrideTranslations(dial_value, XtParseTranslationTable(dest));
XtInstallAccelerators(Gr_dial, Gr_ok);
XtInstallAccelerators(dial_value, Gr_ok);
XtRealizeWidget(Gr_toplevel);
display = XtDisplay(Gr_toplevel);
}
static void enter_dialog();
/* adding the newline actions to the dialog widgets */
static add_nl_action(w)
Widget w;
{
static XtActionsRec actions[] = {
{"enter_dialog", enter_dialog},
};
static char txln[STR_LEN];
static XtTranslations xtxln;
XtAddActions(actions, XtNumber(actions));
sprintf(txln, "<Key>Return: enter_dialog()");
xtxln = XtParseTranslationTable(txln);
XtOverrideTranslations(w, xtxln);
sprintf(txln, "<Key>Linefeed: enter_dialog()");
xtxln = XtParseTranslationTable(txln);
XtOverrideTranslations(w, xtxln);
}
static add_nl_accelerator(src, dest)
Widget dest, src;
{
static String source = "<Key>Return: enter_dialog()";
XtParseAcceleratorTable(source);
XtInstallAccelerators(dest, src);
}
/* user has hit enter */
static void enter_dialog(widget, xev, params, num_params)
Widget widget;
XEvent *xev;
String *params;
Cardinal *num_params;
{
printf("Return Hit!\n");
printf("Dial selected: %s\n", XtDialogGetValueString(Gr_dial));
exit(0);
}
/* ARGSUSED */
static void dial_selected(widget, client_data, call_data)
Widget widget;
caddr_t client_data;
caddr_t call_data;
{
printf("Dial selected: %s\n", buf);
printf("Dial selected: %s\n", XtDialogGetValueString(Gr_dial));
XFlush(display);
usleep(100000);
return;
}
/* ARGSUSED */
static void dial_canceled(widget, client_data, call_data)
Widget widget;
caddr_t client_data;
caddr_t call_data;
{
printf("Dial canceled: %s\n", XtDialogGetValueString(Gr_dial));
exit(0);
}
/* the top level controller for the entire system */
main(argc, argv)
unsigned int argc;
char **argv;
{
static Widget toplevel;
toplevel = XtInitialize("main", "Demo", NULL, ZERO, &argc, argv);
init_gr();
XtMainLoop();
}
---------------------cut here----------------------------
Sandeep Kochhar
(617) 495-9515 mail: kochhar@harvard.harvard.edu
Harvard University kochhar@harvard.csnet
33 Oxford st, kochhar@harvard.uucp
Cambridge, Ma 02138 kochhar@harvard.bitnet
"If you didn't get this message, please let me know."