Re: How to implement JEWL File dialogs?

[tolkamp <f.tolkamp@gmail.com>]

On 26 okt, 11:22, Yannick Duchêne (Hibou57) <yannick_duch...@yahoo.fr>
wrote:
> Le Tue, 26 Oct 2010 10:25:44 +0200, tolkamp <f.tolk...@gmail.com> a écrit:
>
> > I try to implement an file selection window using Open_Dialog. Here is
> > the code:
>
> > My_File_Selection_Dialog : Open_Dialog_Type;
> > --
> > --
> > My_File_Selection_Dialog := Open_Dialog("file name");
> > end;
>
> > Nothing is displayed when this code is running. I expect an input file
> > selection window as described in section 6.3 of
> > JEWL.windows User Manual
>
> OK, I see. The spec in not clear enough I feel, I had to look at the  
> implementation to understand what is wrong.
>
> Here is : Open_Dialog does not open anything, this is just a kind of  
> constructor (bad name for a constructor). Think of it as if it was named  
> Initialize_Open_Dialog. The spec just says “-- create an open file dialog  
> with this title.”, but this ambiguous with such a name.
>
> Open_Dialog returns an instance of a File_Dialog_Type.
> File_Dialog_Type is derived from Common_Dialog_Type.
> Common_Dialog_Type has a method named Execute : function Execute (Dialog :  
> Common_Dialog_Type) return Boolean;
> There as well, the spec is lacking expressiveness, as it just say :
>
>     --  Execute (Dialog)      -- execute the dialog and return True if the  
> OK
>     --                        -- button was used to close the dialog and  
> False
>     --                        -- otherwise.
>
> Actually, I can tell you that this is this Execute method which display  
> the dialog (the spec does not say this, but it is what the implementation  
> actually do).
>
> So, you just have to invok Execute on the instance you created with  
> Open_Dialog.
>
> Tell if that works :)
>
> --
> Si les chats miaulent et font autant de vocalises bizarres, c’est pas pour  
> les chiens.

Indeed when I add the function Execute(My_File_Selection_Dialog) the
expected File Dialog window is shown.
Now I can select the desired file and press button Open.
By adding the function Get_Name(My_File_Selection_Dialog) the selected
file can be used in the application.