PopupMenu.h

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#ifndef POPUPMENU_H_
#define POPUPMENU_H_

#include <gtk/gtkwidget.h>
#include <gtk/gtkmenuitem.h>
#include <list>

namespace gtkutil
{

    class PopupMenu
    {
        public:

            typedef bool (*SensitivityTest)(void);

        private:

            // Main menu widget
            GtkWidget* _menu;

            // Data class containing the elements of a menu item
            struct MenuItem
            {
                    GtkWidget* widget;
                    GFunc callback;
                    gpointer userData;
                    SensitivityTest test;

                    MenuItem (GtkWidget* w, GFunc c, gpointer ud, SensitivityTest t) :
                        widget(w), callback(c), userData(ud), test(t)
                    {
                    }
            };

            // List of menu items
            typedef std::list<MenuItem> MenuItemList;
            MenuItemList _menuItems;

        private:

            /*
             * Default sensitivity test. Return true in all cases. If a menu item does
             * not specify its own sensitivity test, this will be used to ensure the
             * item is always visible.
             */
            static bool _alwaysVisible ()
            {
                return true;
            }

            /* GTK CALLBACKS */

            // Main activation callback from GTK
            static void _onActivate (GtkMenuItem* item, MenuItem* menuItem)
            {
                menuItem->callback(menuItem->widget, menuItem->userData);
            }

            // Mouse click callback (if required)
            static gboolean _onClick (GtkWidget* w, GdkEventButton* e, PopupMenu* self);

        public:

            PopupMenu (GtkWidget* widget = NULL);

            ~PopupMenu ()
            {
                g_object_unref(_menu);
            }

            void addItem (GtkWidget* widget, GFunc callback, gpointer userData, SensitivityTest test = _alwaysVisible);

            void show ();
    };
} // namespace gtkutil

#endif /*POPUPMENU_H_*/