toggling dialogs open and closed

[Angus Leeming]

JMarc,

I have fixed things in my tree here so that this should be pretty easy. All 
insets with dialogs are now derived from withDialog, so:

#include "frontends/DialogBase.h"
#include <sigc++/signal_system.h>

class withDialog {
public:
        virtual ~withDialog()
        {
                if (connected())
                        hideDialog_();
        }
        bool connected() const
        {
                return hideConnection_.connected();
        }
        void disconnect()
        {
                hideConnection_.disconnect();
        }
        void connect(DialogBase & dialog)
        {
                hideConnection_ =
                        hideDialog_.connect(SigC::slot(&dialog, &DialogBase::hide));
        }

private:
        ///
        SigC::Signal0<void> hideDialog_;
        ///
        SigC::Connection hideConnection_;
};


That is, the all important SigC::Connection has been moved from the 
controllers to the inset, where it really belongs.

Remind me again about the LFUNs and how they are to be used.

Angus