105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
#include <gtk/gtk.h>
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/* This is a callback function. The data arguments are ignored
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* in this example. More on callbacks below.
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*/
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static void
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print_hello (GtkWidget *widget,
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gpointer data)
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{
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g_print ("Hello World\n");
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}
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static gboolean
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on_delete_event (GtkWidget *widget,
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GdkEvent *event,
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gpointer data)
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{
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/* If you return FALSE in the "delete_event" signal handler,
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* GTK will emit the "destroy" signal. Returning TRUE means
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* you don't want the window to be destroyed.
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*
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* This is useful for popping up 'are you sure you want to quit?'
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* type dialogs.
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*/
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g_print ("delete event occurred\n");
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return TRUE;
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}
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int
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main (int argc,
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char *argv[])
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{
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/* GtkWidget is the storage type for widgets */
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GtkWidget *window;
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GtkWidget *button;
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/* This is called in all GTK applications. Arguments are parsed
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* from the command line and are returned to the application.
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*/
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gtk_init (&argc, &argv);
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/* create a new window, and set its title */
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_title (GTK_WINDOW (window), "Hello");
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/* When the window emits the "delete-event" signal (which is emitted
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* by GTK+ in response to an event coming from the window manager,
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* usually as a result of clicking the "close" window control), we
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* ask it to call the on_delete_event() function as defined above.
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*
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* The data passed to the callback function is NULL and is ignored
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* in the callback function.
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*/
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g_signal_connect (window, "delete-event", G_CALLBACK (on_delete_event), NULL);
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/* Here we connect the "destroy" event to the gtk_main_quit() function.
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*
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* This signal is emitted when we call gtk_widget_destroy() on the window,
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* or if we return FALSE in the "delete_event" callback.
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*/
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g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
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/* Sets the border width of the window. */
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gtk_container_set_border_width (GTK_CONTAINER (window), 10);
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/* Creates a new button with the label "Hello World". */
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button = gtk_button_new_with_label ("Hello World");
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/* When the button receives the "clicked" signal, it will call the
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* function print_hello() passing it NULL as its argument.
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*
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* The print_hello() function is defined above.
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*/
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g_signal_connect (button, "clicked", G_CALLBACK (print_hello), NULL);
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/* The g_signal_connect_swapped() function will connect the "clicked" signal
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* of the button to the gtk_widget_destroy() function; instead of calling it
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* using the button as its argument, it will swap it with the user data
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* argument. This will cause the window to be destroyed by calling
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* gtk_widget_destroy() on the window.
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*/
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g_signal_connect_swapped (button, "clicked", G_CALLBACK (gtk_widget_destroy), window);
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/* This packs the button into the window. A GtkWindow inherits from GtkBin,
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* which is a special container that can only have one child
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*/
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gtk_container_add (GTK_CONTAINER (window), button);
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/* The final step is to display this newly created widget... */
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gtk_widget_show (button);
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/* ... and the window */
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gtk_widget_show (window);
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/* All GTK applications must have a gtk_main(). Control ends here
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* and waits for an event to occur (like a key press or a mouse event),
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* until gtk_main_quit() is called.
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*/
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gtk_main ();
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return 0;
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}
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