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his chapter will teach you how to create pop-up menus, menu bars, and toolbars. You will begin by creating each manually, so you learn how the widgets are constructed. This will give you a firm understanding of all of the concepts on which menus and toolbars rely. After you understand each widget, you will be introduced to GtkUIManager, which allows you to dynamically create menus and toolbars through custom XML files. Each user interface file is loaded, and each element applied to a corresponding action object, which tells the item how it will be displayed and how it will act. In this chapter, you will learn the following: How to create pop-up menus, menu bars, and toolbars How to apply keyboard accelerators to menu items What the GtkStatusBar widget is and how you can use it to provide more information to the user about a menu item What types of menu and toolbar items are provided by GTK+ How to dynamically create menus and toolbars with UI files How to create custom stock items with GtkIconFactory
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You will begin this chapter by learning how to create a pop-up menu. A pop-up menu is a GtkMenu widget that is displayed to the user when the right mouse button is clicked while hovering above certain widgets. Some widgets, such as GtkEntry and GtkTextView, already have pop-up menus built into the widget by default. If you want to change the pop-up menu of a widget that offers one by default, you should edit the supplied GtkMenu widget in the pop-up callback function. For example, both GtkEntry and GtkTextView have a populate-popup signal, which receives the GtkMenu that is going to be displayed. You can edit this menu in any way you see fit before displaying it to the user.
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CHAPTER 9 MENUS AND TOOLBARS
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For most widgets, you will need to create your own pop-up menu. In this section, you are going to learn how to supply a pop-up menu to a GtkProgressBar widget. The pop-up menu we are going to implement is presented in Figure 9-1.
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Figure 9-1. A simple pop-up menu with three menu items The three pop-up menu items are used to pulse the progress bar, set it as 100 percent complete, and clear it. You will notice that, in Listing 9-1, an event box contains the progress bar. Because GtkProgressBar, like GtkLabel, is not able to detect GDK events by itself, we need to catch button-press-event signals using an event box. Listing 9-1. Simple Pop-up Menu (popupmenus.c) #include <gtk/gtk.h> static static static static static void create_popup_menu (GtkWidget*, GtkWidget*); void pulse_activated (GtkMenuItem*, GtkProgressBar*); void clear_activated (GtkMenuItem*, GtkProgressBar*); void fill_activated (GtkMenuItem*, GtkProgressBar*); gboolean button_press_event (GtkWidget*, GdkEventButton*, GtkWidget*);
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int main (int argc, char *argv[]) { GtkWidget *window, *progress, *eventbox, *menu; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Pop-up Menus"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 250, -1);
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CHAPTER 9 MENUS AND TOOLBARS
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/* Create all of the necessary widgets and initialize the pop-up menu. */ menu = gtk_menu_new (); eventbox = gtk_event_box_new (); progress = gtk_progress_bar_new (); gtk_progress_bar_set_text (GTK_PROGRESS_BAR (progress), "Nothing Yet Happened"); create_popup_menu (menu, progress); gtk_progress_bar_set_pulse_step (GTK_PROGRESS_BAR (progress), 0.05); gtk_event_box_set_above_child (GTK_EVENT_BOX (eventbox), FALSE); g_signal_connect (G_OBJECT (eventbox), "button_press_event", G_CALLBACK (button_press_event), menu); gtk_container_add (GTK_CONTAINER (eventbox), progress); gtk_container_add (GTK_CONTAINER (window), eventbox); gtk_widget_set_events (eventbox, GDK_BUTTON_PRESS_MASK); gtk_widget_realize (eventbox); gtk_widget_show_all (window); gtk_main (); return 0; } /* Create the pop-up menu and attach it to the progress bar. This will make sure * that the accelerators will work from application load. */ static void create_popup_menu (GtkWidget *menu, GtkWidget *progress) { 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);
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