Hmmm....I'd do something like this,
TBaseNumberFormatter = class(TObject)
private
class function FormatString(...): String; virtual; abstract;
end;
TCustomerNumberFormatter = class(TBaseNumberFormatter)
private
class function FormatString(...): String; override;
end;
TArrangementNumberFormatter = class(TBaseNumberFormatter)
private
class function FormatString(...): String; override;
end;
TNumberFormatterClass = class of TBaseNumberFormatter;
...
var
MyClass: TNumberFormatterClass;
case FormatType of
ftArrangmentNumber: MyClass := TArrangementNumberFormatter;
ftCustomerNumber: MyClass := TCustomerNumberFormatter;
end; {case}
Edit1.Caption := MyClass.FormatString(...);
That's purely ottomh, so I may not have the details exactly correct.
Hopefully it'll point you in the right direction though.
Regards,
Darren
Jesper Stenlund wrote:
> I have a bunch of classes that formats a string in different ways.
> Today I have to create an instance of a specific "formattingobject" and
> then run the formattingmethod.
> Instead of that behaviour I now want make the formattingmethod a class
> method.
>
> But that causes me some other problems.
> Here's a small example:
>
> TCustomerNumberFormatter = class (TObject)
> private
> class function FormatString(aString: String): string;
> end;
>
> TArrangementNumberFormatter = class (TObject)
> private
> class function FormatString(aString: String): string;
> end;
>
>
> Then I want to do something like this but I don't know exactly how to
> write my code.
>
> case FormatType of
> ftArrangementNumber: myClass := TArrangementNumberFormatter;
> ftCustomerNumber: myClass := TCustomerNumberFormatter;
> end;
>
> TEdit1.Caption := myClass.FormatString(myObject.StringToFormat);
>
>
> I know that last row isn't correct, but how can I do this?
>
> I hope you understand what I'm looking for.
> I want to use the classname that I get from the case-sentence and then run
> the class function on that particular class.
> Is it possible to do it like this?
>
_______________________________________________
Delphi mailing list -> [email protected]
http://lists.elists.org/cgi-bin/mailman/listinfo/delphi
