In order to allow different parts of an application to use the same statusbar to display messages, the statusbar widget issues Context Identifiers which are used to identify different "users". The message on top of the stack is the one displayed, no matter what context it is in. Messages are stacked in last-in-first-out order, not context identifier order.
A statusbar is created with a call to:
StatusBar statusbar1 = new StatusBar();A new Context Identifier is requested using a call to the following function with a short textual description of the context:
uint statusbar1.ContectId(string context_description);There are three functions that can operate on statusbars:
uint statusbar1.Push( uint context_id, string text );
statusbar1.Pop(uint context_id );
statusbar1.Remove( uint context_id, uint message_id );The first, Push(), is used to add a new message to the statusbar. It returns a Message Identifier, which can be passed later to the method Remove() to remove the message with the given Message and Context Identifiers from the statusbar's stack.
The methods Pop() removes the message highest in the stack with the given Context Identifier.
In addition to messages, statusbars may also display a resize grip, which can be dragged with the mouse to resize the toplevel window containing the statusbar, similar to dragging the window frame. The following functions control the display of the resize grip.
statusbar1.HasResizeGrip = bool setting; bool setting = statusbar1.HasResizeGrip;The following example creates a statusbar and two buttons, one for pushing items onto the statusbar, and one for popping the last item back off.
#include >stdlib.h< #include >gtk/gtk.h< #include >glib.h< GtkWidget *status_bar; static void push_item( GtkWidget *widget, gpointer data ) { static int count = 1; gchar *buff; buff = g_strdup_printf ("Item %d", count++); gtk_statusbar_push (GTK_STATUSBAR (status_bar), GPOINTER_TO_INT (data), buff); g_free (buff); } static void pop_item( GtkWidget *widget, gpointer data ) { gtk_statusbar_pop (GTK_STATUSBAR (status_bar), GPOINTER_TO_INT (data)); } int main( int argc, char *argv[] ) { GtkWidget *window; GtkWidget *vbox; GtkWidget *button; gint context_id; gtk_init (&argc, &argv); /* create a new window */ window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_widget_set_size_request (GTK_WIDGET (window), 200, 100); gtk_window_set_title (GTK_WINDOW (window), "GTK Statusbar Example"); g_signal_connect (G_OBJECT (window), "delete_event", G_CALLBACK (exit), NULL); vbox = gtk_vbox_new (FALSE, 1); gtk_container_add (GTK_CONTAINER (window), vbox); gtk_widget_show (vbox); status_bar = gtk_statusbar_new (); gtk_box_pack_start (GTK_BOX (vbox), status_bar, TRUE, TRUE, 0); gtk_widget_show (status_bar); context_id = gtk_statusbar_get_context_id( GTK_STATUSBAR (status_bar), "Statusbar example"); button = gtk_button_new_with_label ("push item"); g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (push_item), GINT_TO_POINTER (context_id)); gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 2); gtk_widget_show (button); button = gtk_button_new_with_label ("pop last item"); g_signal_connect (G_OBJECT (button), "clicked", G_CALLBACK (pop_item), GINT_TO_POINTER (context_id)); gtk_box_pack_start (GTK_BOX (vbox), button, TRUE, TRUE, 2); gtk_widget_show (button); /* always display the window as the last step so it all splashes on * the screen at once. */ gtk_widget_show (window); gtk_main (); return 0; }