[lazarus] Multiplataform

Sebastian Günther sguenther at gmx.de
Tue Jun 29 03:45:55 EDT 1999

Nicolas Aragon wrote:

> Using this approach, and KCL people seems to go this way, it's
> possible to write both trees independently.

no, it uses a different approach: at the moment KCL is a single big unit
(only the signal/slot stuff is separated, as this isn't platform
dependent). Its interface and implementation parts are a bunch of
include files.
e.g. kcl_gtk/kcl.pp looks about the following:
  unit kcl;
  <some GTK specfic declarations>
  {$INCLUDE kcl_h.inc}
  {$INCLUDE kcl_impl.inc}  // platform-independent method
  {$INCLUDE gapp.inc}
  {$INCLUDE gdrawing.inc}
  {$INCLUDE gform.inc}

kcl_h.inc basically does the following stuff:
  {$INCLUDE hkeys.inc}
  {$INCLUDE hdrawing.inc}
  {$INCLUDE hguibase.inc}

So all implementations share the same interface part; the only thing you
have to do is to define some target-dependend types at the beginning of
the interface part. For example, a TWidget has a member called 'Handle'.
Under GTK, this is defined as a PGtkWidget, unter Win32 it is a HWindow,
and so on.

> I must disagree a bit: I've been waiting a long time for "procedure of
> object" bugs to be solved.

you're not alone...

- Sebastian

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