BooleanAttribute.h

Go to the documentation of this file.

#ifndef BOOLEANATTRIBUTE_H_
#define BOOLEANATTRIBUTE_H_

class BooleanAttribute: public EntityAttribute
{
        std::string m_classname;
        // The key that this BooleanAttribute is operating on.
        std::string m_key;
        // The visible checkbox
        GtkCheckButton* m_check;

        // Callback function to propagate the change to the keyval whenever the
        // checkbox is toggled. This is passed an explicit "this" pointer because
        // the GTK API is based on C not C++.
        static gboolean toggled (GtkWidget *widget, BooleanAttribute* self)
        {
            self->apply();
            return FALSE;
        }
    public:
        // Constructor
        BooleanAttribute (const std::string& classname, const std::string& key) :
            m_classname(classname), m_key(key), m_check(0)
        {
            GtkCheckButton* check = GTK_CHECK_BUTTON(gtk_check_button_new());

            // Show the checkbutton
            gtk_widget_show(GTK_WIDGET(check));

            m_check = check;

            // Connect up the callback function
            guint handler = g_signal_connect(G_OBJECT(check), "toggled", G_CALLBACK(toggled), this);
            g_object_set_data(G_OBJECT(check), "handler", gint_to_pointer(handler));

            // Get the keyval after construction
            update();
        }
        // Return the checkbox as a GtkWidget
        GtkWidget* getWidget () const
        {
            return GTK_WIDGET(m_check);
        }

        // Propagate GUI changes to the underlying keyval
        void apply (void)
        {
            std::string value = gtk_toggle_button_get_active(GTK_TOGGLE_BUTTON(m_check)) ? "1" : "0";
            // Set 1 for checkbox ticked, 0 otherwise
            entitySetValue(m_classname, m_key, value);
        }

        // Retrieve keyval and update GtkWidget accordingly
        void update (void)
        {
            const std::string value = entityGetValueForKey(m_key);
            // Set checkbox to enabled for a keyval other than 0
            if (value.length() > 0) {
                toggle_button_set_active_no_signal(GTK_TOGGLE_BUTTON(m_check), string::toInt(value) != 0);
            } else {
                // No keyval found, set self to inactive
                toggle_button_set_active_no_signal(GTK_TOGGLE_BUTTON(m_check), false);
            }
        }
};

#endif /* BOOLEANATTRIBUTE_H_ */