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After you generate a context identifier, you can add a message to the top of the status bar s stack with gtk_statusbar_push(). This function returns a unique message identifier for the string that was just added. This identifier can be used later to remove the message from the stack, regardless of its location. guint gtk_statusbar_push (GtkStatusBar *statusbar, guint context_id, const gchar *message); There are two ways to remove a message from the stack. If you want to remove a message from the top of the stack for a specific context ID, you can use gtk_statusbar_pop(). This function will remove the message that is highest on the status bar s stack with a context identifier of context_id. void gtk_statusbar_pop (GtkStatusBar *statusbar, guint context_id); It is also possible to remove a specific message from the status bar s message stack with gtk_statusbar_remove(). To do this, you must provide the context identifier of the message and the message identifier of the message you want to remove, which was returned by gtk_statusbar_push() when it was added. void gtk_statusbar_remove (GtkStatusBar *statusbar, guint context_id, guint message_id); GtkStatusbar has one property, has-resize-grip, which will place a graphic in the corner of the status bar for resizing the window. The user will be able to grab the resize grip and drag it to resize its parent window. You can also use the built-in function gtk_statusbar_set_has_ resize_grip() to set this property.
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One useful role of the status bar is to give the user more information about the menu item the mouse cursor is currently hovering over. An example of this was shown in the previous section in Figure 9-2, which is a screenshot of the progress bar pop-up menu application in Listing 9-4. To implement status bar hints, you should connect each of your menu items to GtkWidget s enter-notify-event and leave-notify-event signals. Listing 9-4 shows the progress bar pop-up menu application you have already learned about, except status bar hints are provided when the mouse cursor moves over a menu item.
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Listing 9-4. Displaying More Information About a Menu Item (statusbarhints.c) static void create_popup_menu (GtkWidget *menu, GtkWidget *progress, GtkWidget *statusbar) { GtkWidget *pulse, *fill, *clear, *separator; pulse = gtk_menu_item_new_with_label ("Pulse Progress"); fill = gtk_menu_item_new_with_label ("Set as Complete"); clear = gtk_menu_item_new_with_label ("Clear Progress"); separator = gtk_separator_menu_item_new (); g_signal_connect (G_OBJECT (pulse), "activate", G_CALLBACK (pulse_activated), progress); g_signal_connect (G_OBJECT (fill), "activate", G_CALLBACK (fill_activated), progress); g_signal_connect (G_OBJECT (clear), "activate", G_CALLBACK (clear_activated), progress); /* Connect signals to each menu item for status bar messages. */ g_signal_connect (G_OBJECT (pulse), "enter-notify-event", G_CALLBACK (statusbar_hint), statusbar); g_signal_connect (G_OBJECT (pulse), "leave-notify-event", G_CALLBACK (statusbar_hint), statusbar); g_signal_connect (G_OBJECT (fill), "enter-notify-event", G_CALLBACK (statusbar_hint), statusbar); g_signal_connect (G_OBJECT (fill), "leave-notify-event", G_CALLBACK (statusbar_hint), statusbar); g_signal_connect (G_OBJECT (clear), "enter-notify-event", G_CALLBACK (statusbar_hint), statusbar); g_signal_connect (G_OBJECT (clear), "leave-notify-event", G_CALLBACK (statusbar_hint), statusbar); g_object_set_data (G_OBJECT (pulse), "menuhint", (gpointer) "Pulse the progress bar one step."); g_object_set_data (G_OBJECT (fill), "menuhint", (gpointer) "Set the progress bar to 100%."); g_object_set_data (G_OBJECT (clear), "menuhint", (gpointer) "Clear the progress bar to 0%."); gtk_menu_shell_append gtk_menu_shell_append gtk_menu_shell_append gtk_menu_shell_append (GTK_MENU_SHELL (GTK_MENU_SHELL (GTK_MENU_SHELL (GTK_MENU_SHELL (menu), (menu), (menu), (menu), pulse); separator); fill); clear);
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gtk_menu_attach_to_widget (GTK_MENU (menu), progress, NULL); gtk_widget_show_all (menu); } /* Add or remove a status bar menu hint, depending on whether this function * is initialized by a proximity-in-event or proximity-out-event. */ static gboolean statusbar_hint (GtkMenuItem *menuitem, GdkEventProximity *event, GtkStatusbar *statusbar) { gchar *hint; guint id = gtk_statusbar_get_context_id (statusbar, "MenuItemHints"); if (event->type == GDK_ENTER_NOTIFY) { hint = (gchar*) g_object_get_data (G_OBJECT (menuitem), "menuhint"); gtk_statusbar_push (statusbar, id, hint); } else if (event->type == GDK_LEAVE_NOTIFY) gtk_statusbar_pop (statusbar, id); return FALSE; } When implementing status bar hints, you first need to figure out what signals are necessary. We want to be able to add a message to the status bar when the mouse cursor moves over the menu item and remove it when the mouse cursor leaves. From this description, using enter-notify-event and leave-notify-event is a good solution. One advantage of using these two signals is that we only need one callback function, because the prototype for each receives a GdkEventProximity object. From this object, we can discern between GDK_ENTER_NOTIFY and GDK_LEAVE_NOTIFY events. You will want to return FALSE from the callback function, because you do not want to prevent GTK+ from handling the event; you only want to enhance what is performed when it is emitted. Within the statusbar_hint() callback function, you should first retrieve a context identifier for the menu item messages. You can use whatever string you want, as long as your application remembers what was used. In Listing 9-4, "MenuItemHints" was used to describe all of the menu item messages added to the status bar. If other parts of the application used the status bar, using a different context identifier would leave the menu item hints untouched. guint id = gtk_statusbar_get_context_id (statusbar, "MenuItemHints"); If the event type is GDK_ENTER_NOTIFY, you need to show the message to the user. In the create_popup_menu() function, a data parameter was added to each menu item called "menuhint". This is a more in-depth description of what the menu item does, which will be displayed to the user. hint = (gchar*) g_object_get_data (G_OBJECT (menuitem), "menuhint"); gtk_statusbar_push (statusbar, id, hint);
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