Re: [gtkmm] MFC's UpdateData() equivalent ?

[wolfgang draxinger <hexarith darkstargames de>]

Gopal Sumathi (Princeton-intern) wrote:
> Hi,
> I'm translating GUI written using Windows MFCs to use GTKMM instead.
> Is there a method equivalent to UpdataData() of MFC's Container class?
> Basically this method can be used to copy displayed data into the 
> associate widget-variable and vise-versa. When a method in the container 
> class, it should be able to update variables of all its children.
>
> In the same context, are there variables associated with widgets ? i.e. 
> if its a Gtk::Entry , is there an associated variable, that holds 
> associated data ?

There's no eqvivalent to MFC::CDialog::UpdateData. But thats not 
cexxesary, since you normally use a signal to retrive events on widgets. 
For the entry widget there is a signal for text change. The good thing 
is, that you can aassiciate to every signal connection a user defined 
value, e.g. a pointer, so all you've to do is writing a signal handler, 
that uses that value as a pointer to a string variable and copies the 
content of the widget into this variable. Then you just connect every 
widget to a variable via a unique signal handler. And you don't have to 
update the data manually, which is a common bug-source in the MFC.