mirror of
https://gitlab.gnome.org/GNOME/gtk.git
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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. */
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/* helloworld.c */
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#include <gtk/gtk.h>
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/* this is a callback function. the data arguments are ignored in this example.
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* More on callbacks below. */
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void hello (GtkWidget *widget, 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, gpointer data)
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{
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g_print ("delete event occured\n");
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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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/* 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, 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, 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 from
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* 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 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. */
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gtk_signal_connect (GTK_OBJECT (window), "delete_event",
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GTK_SIGNAL_FUNC (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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gtk_signal_connect (GTK_OBJECT (window), "destroy",
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GTK_SIGNAL_FUNC (destroy), NULL);
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/* sets the border width of the window. */
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gtk_container_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 it's argument. The hello()
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* function is defined above. */
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gtk_signal_connect (GTK_OBJECT (button), "clicked",
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GTK_SIGNAL_FUNC (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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gtk_signal_connect_object (GTK_OBJECT (button), "clicked",
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GTK_SIGNAL_FUNC (gtk_widget_destroy),
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GTK_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 mouse event). */
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gtk_main ();
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return 0;
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}
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