mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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1bfcf9ba16
Sat Aug 24 12:46:37 BST 2002 Tony Gale <gale@gtk.org>
* docs/tutorial/gtk-tut.sgml, examples/*:
update g_connect_signal usage
* docs/faq/gtk-faq.html: spelling/grammar fixes
100 lines
3.3 KiB
C
100 lines
3.3 KiB
C
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#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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void 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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gint 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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* This is useful for popping up 'are you sure you want to quit?'
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* type dialogs. */
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g_print ("delete event occurred\n");
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/* Change TRUE to FALSE and the main window will be destroyed with
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* a "delete_event". */
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return TRUE;
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}
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/* Another callback */
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void destroy( GtkWidget *widget,
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gpointer data )
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{
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gtk_main_quit ();
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}
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int 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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gtk_init (&argc, &argv);
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/* create a new window */
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window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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/* When the window is given the "delete_event" signal (this is given
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* by the window manager, usually by the "close" option, or on the
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* titlebar), we ask it to call the delete_event () function
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* as defined above. The data passed to the callback
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* function is NULL and is ignored in the callback function. */
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g_signal_connect (G_OBJECT (window), "delete_event",
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G_CALLBACK (delete_event), NULL);
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/* Here we connect the "destroy" event to a signal handler.
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* This event occurs 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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g_signal_connect (G_OBJECT (window), "destroy",
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G_CALLBACK (destroy), 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 hello() passing it NULL as its argument. The hello()
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* function is defined above. */
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g_signal_connect (G_OBJECT (button), "clicked",
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G_CALLBACK (hello), NULL);
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/* This will cause the window to be destroyed by calling
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* gtk_widget_destroy(window) when "clicked". Again, the destroy
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* signal could come from here, or the window manager. */
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g_signal_connect_swapped (G_OBJECT (button), "clicked",
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G_CALLBACK (gtk_widget_destroy),
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G_OBJECT (window));
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/* This packs the button into the window (a gtk container). */
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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
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* mouse event). */
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gtk_main ();
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return 0;
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}
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