Re: Subclassing widgets

[Jason Curole <jcurole gmail com>]

Thanks Simon, this is brilliant and so obvious in retrospect.

Jason

On Wed, Feb 25, 2009 at 8:59 PM, Simon Fuhrmann <simonfuhrmann gmx de> wrote:

> How would one pass/send the filename chosen _out_ of the toolbar
> object and up to the main window object where the database object has access
> to it?

That is exactly what you have to do. Use have to write your own signal
like any other GTK widget is doing. Here is how to do that:

Create a private member in your toolbar:

public:
 typedef sigc::signal<void, Glib::ustring> SignalFileSelected;
private:
 SignalFileSelected sig_file_selected;

Create a public access method to access the signal:

 SignalFileSelected& signal_file_selected (void)
 { return this->sig_file_selected; }

Don't forget the reference ("&")! Connect the signal from you main GUI,

 this->toolbar.signal_file_selected().connect
     (sigc::mem_fun(*this, &MainGui::on_file_selected));

Inside the Toolbar, emit the signal if you have the new filename:

 this->sig_file_selected.emit(filename);

The method that takes the filename inside the main GUI is of type:

 void on_file_selected (Glib::ustring filename);

Cheers,
Simon