Re: [Fxruby-users] (Non)modal dialogues.

[Lyle J. <jl...@cf...>]

Hugh Sasse Staff Elec Eng wrote:

> Yes, that helps.  I'm puzzled about this design though: the Dialog
> box would have to ask the application to ask the dialog box?  This
> runs counter to "Tell, don't ask", IMO, if I understood that
> philosophy correctly.

The dialog box doesn't own the information about whether it's modal or 
not, the application does. When you do:

     dialogBox.execute

the application starts a modal event loop for the dialog box. The code 
for FXDialogBox#execute is of course implemented in C++, but if it were 
in Ruby it would look something like this:

     def execute(placement=PLACEMENT_CURSOR)
       create
       show(placement)
       getApp().runModalFor(self)
     end

At this point, control returns to the event loop which is now modal for 
this dialog box. When you later send either the ID_ACCEPT or ID_CANCEL 
command message to the dialog box, this modal loop is terminated. In 
Ruby code, the message handlers for those would look something like:

     def onCmdAccept
       getApp().stopModal(self, 1)
       hide
     end

     def onCmdCancel
       getApp().stopModal(self, 0)
       hide
     end

So again, it is the application that keeps track of who's modal and who 
isn't.

Hope this helps,

Lyle