mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-12-25 13:11:13 +00:00
105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
#include <gtk/gtk.h>
|
|
|
|
/* This is a callback function. The data arguments are ignored
|
|
* in this example. More on callbacks below.
|
|
*/
|
|
static void
|
|
print_hello (GtkWidget *widget,
|
|
gpointer data)
|
|
{
|
|
g_print ("Hello World\n");
|
|
}
|
|
|
|
static gboolean
|
|
on_delete_event (GtkWidget *widget,
|
|
GdkEvent *event,
|
|
gpointer data)
|
|
{
|
|
/* 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.
|
|
*/
|
|
|
|
g_print ("delete event occurred\n");
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
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, and set its title */
|
|
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
|
|
gtk_window_set_title (GTK_WINDOW (window), "Hello");
|
|
|
|
/* When the window emits the "delete-event" signal (which is emitted
|
|
* by GTK+ in response to an event coming from the window manager,
|
|
* usually as a result of clicking the "close" window control), we
|
|
* ask it to call the on_delete_event() function as defined above.
|
|
*
|
|
* The data passed to the callback function is NULL and is ignored
|
|
* in the callback function.
|
|
*/
|
|
g_signal_connect (window, "delete-event", G_CALLBACK (on_delete_event), NULL);
|
|
|
|
/* Here we connect the "destroy" event to the gtk_main_quit() function.
|
|
*
|
|
* This signal is emitted when we call gtk_widget_destroy() on the window,
|
|
* or if we return FALSE in the "delete_event" callback.
|
|
*/
|
|
g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
|
|
|
|
/* Sets the border width of the window. */
|
|
gtk_container_set_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 print_hello() passing it NULL as its argument.
|
|
*
|
|
* The print_hello() function is defined above.
|
|
*/
|
|
g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
|
|
|
|
/* The g_signal_connect_swapped() function will connect the "clicked" signal
|
|
* of the button to the gtk_widget_destroy() function; instead of calling it
|
|
* using the button as its argument, it will swap it with the user data
|
|
* argument. This will cause the window to be destroyed by calling
|
|
* gtk_widget_destroy() on the window.
|
|
*/
|
|
g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
|
|
|
|
/* This packs the button into the window. A GtkWindow inherits from GtkBin,
|
|
* which is a special container that can only have one child
|
|
*/
|
|
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 a mouse event),
|
|
* until gtk_main_quit() is called.
|
|
*/
|
|
gtk_main ();
|
|
|
|
return 0;
|
|
}
|