mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-12-28 14:31:10 +00:00
d7aa6a88fb
Mon Apr 6 08:08:49 BST 1998 Tony Gale <gale@gtk.org>
* docs/gtk_tut.sgml examples/helloworld/helloworld.c:
Change a missed "delete_event" return value description
from TRUE to FALSE.
98 lines
3.4 KiB
C
98 lines
3.4 KiB
C
/* This file extracted from the GTK tutorial. */
|
|
|
|
/* helloworld.c */
|
|
|
|
#include <gtk/gtk.h>
|
|
|
|
/* this is a callback function. the data arguments are ignored in this example.
|
|
* More on callbacks below. */
|
|
void hello (GtkWidget *widget, gpointer data)
|
|
{
|
|
g_print ("Hello World\n");
|
|
}
|
|
|
|
|
|
gint delete_event(GtkWidget *widget, gpointer data)
|
|
{
|
|
g_print ("delete event occured\n");
|
|
/* if you return FALSE in the "delete_event" signal handler,
|
|
* GTK will emit the "destroy" signal. Returning TRUE means
|
|
* you don't want the window to be destroyed.
|
|
* This is useful for popping up 'are you sure you want to quit ?'
|
|
* type dialogs. */
|
|
|
|
/* Change TRUE to FALSE and the main window will be destroyed with
|
|
* a "delete_event". */
|
|
|
|
return (TRUE);
|
|
}
|
|
|
|
/* another callback */
|
|
void destroy (GtkWidget *widget, gpointer data)
|
|
{
|
|
gtk_main_quit ();
|
|
}
|
|
|
|
int main (int argc, char *argv[])
|
|
{
|
|
/* GtkWidget is the storage type for widgets */
|
|
GtkWidget *window;
|
|
GtkWidget *button;
|
|
|
|
/* this is called in all GTK applications. arguments are parsed from
|
|
* the command line and are returned to the application. */
|
|
gtk_init (&argc, &argv);
|
|
|
|
/* create a new window */
|
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
|
|
/* when the window is given the "delete_event" signal (this is given
|
|
* by the window manager (usually the 'close' option, or on the
|
|
* titlebar), we ask it to call the delete_event () function
|
|
* as defined above. The data passed to the callback
|
|
* function is NULL and is ignored in the callback. */
|
|
gtk_signal_connect (GTK_OBJECT (window), "delete_event",
|
|
GTK_SIGNAL_FUNC (delete_event), NULL);
|
|
|
|
/* here we connect the "destroy" event to a signal handler.
|
|
* This event occurs when we call gtk_widget_destroy() on the window,
|
|
* or if we return 'FALSE' in the "delete_event" callback. */
|
|
gtk_signal_connect (GTK_OBJECT (window), "destroy",
|
|
GTK_SIGNAL_FUNC (destroy), NULL);
|
|
|
|
/* sets the border width of the window. */
|
|
gtk_container_border_width (GTK_CONTAINER (window), 10);
|
|
|
|
/* creates a new button with the label "Hello World". */
|
|
button = gtk_button_new_with_label ("Hello World");
|
|
|
|
/* When the button receives the "clicked" signal, it will call the
|
|
* function hello() passing it NULL as it's argument. The hello()
|
|
* function is defined above. */
|
|
gtk_signal_connect (GTK_OBJECT (button), "clicked",
|
|
GTK_SIGNAL_FUNC (hello), NULL);
|
|
|
|
/* This will cause the window to be destroyed by calling
|
|
* gtk_widget_destroy(window) when "clicked". Again, the destroy
|
|
* signal could come from here, or the window manager. */
|
|
gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
|
|
GTK_SIGNAL_FUNC (gtk_widget_destroy),
|
|
GTK_OBJECT (window));
|
|
|
|
/* this packs the button into the window (a gtk container). */
|
|
gtk_container_add (GTK_CONTAINER (window), button);
|
|
|
|
/* the final step is to display this newly created widget... */
|
|
gtk_widget_show (button);
|
|
|
|
/* and the window */
|
|
gtk_widget_show (window);
|
|
|
|
/* all GTK applications must have a gtk_main(). Control ends here
|
|
* and waits for an event to occur (like a key press or mouse event). */
|
|
gtk_main ();
|
|
|
|
return 0;
|
|
}
|
|
|