perl-win32-gui-users

[perl-win32-gui-users] tutorials use strict? use warnings? globals? sender and eventargs? $self?

[David C. <dpc...@ho...>]

perl-win32-gui-users:

I'm a Win32::GUI newbie who went through the tutorials the other night:

    http://perl-win32-gui.sourceforge.net/cgi-bin/docs.cgi?doc=tutorial

and was shocked to see:

1.  No "use strict" nor "use warnings".

2.  The scripts used global variables to pass around references to the
windows, controls, etc..

3.  There were no sender or eventargs arguments.  (Not even a $self
arg?)  RTFM, I don't see them either.


Am I missing something?  I was looking for an OO GUI toolkit in Perl.  I
intend to build an application that will feature pop-up forms for
editing objects persisted in a database.  My idea is to create a class
and a table for each object type.  The class includes a method to create
and display a window for editing that type of object.  When the user
needs to create/ edit an object, I create an object, stuff it/ get it
stuffed with data, and/or create/ display the editor window.  The user
may have many such windows open at the same time, including multiple
windows from the same class.  When the user interacts with the windows
and controls, the event handlers need to be able to find the right
object.  Microsoft's "sender" argument solves this need nicely.
Microsoft's "eventargs" argument solves other needs nicely.  Does
Win32::GUI have equivalents?


TIA,

David

Re: [perl-win32-gui-users] tutorials use strict? use warnings? globals? sender and eventargs? $self?

[David C. <dpc...@ho...>]

Glenn Linderman wrote:
> #3. I've read bunches of Windows API documentation, and have never
> found anything called "sender", "eventargs", or "self".  You must be
> reading stuff at some higher level of abstraction.

http://search.cpan.org/~robertmay/Win32-GUI-1.06/docs/GUI/UserGuide/Read
me.pod

"Win32::GUI is a Win32-platform native graphical user interface toolkit
for perl. Basically, it's an XS implementation of most of the functions
found in user32.dll and gdi32.dll, with an object oriented perl
interface and an event-based dialog model that mimic the functionality
of visual basic."

I was expecting something like Visual Basic (although I prefer C#):

http://msdn2.microsoft.com/en-us/library/system.windows.forms.control.cl
ick(VS.71).aspx


jez_whit wrote:
> To do this have a look at the UserData method. It allows you to
> associate data to a window. When you use NEM events the first parm is
> the object that the event fired on. Say for example you have a button
> on a form, and you have many instances of that form your even handler
> would look like:
> My $self=shift; #the button object
> My $parent = $self->parent; #the parent window
> My $object = $parent->UserData; #the instance data for the window

I guessed at a solution like that, but didn't see $self in the
documentation for Button_Click():

http://perl-win32-gui.sourceforge.net/cgi-bin/docs.cgi?doc=button

Where is this documented?


David

Re: [perl-win32-gui-users] tutorials use strict? use warnings? globals? sender and eventargs? $self?

[Robert M. <ro...@th...>]

On 21/02/2008, David Christensen <dpc...@ho...> wrote:
> perl-win32-gui-users:
>
>  I'm a Win32::GUI newbie who went through the tutorials the other night:
>
>     http://perl-win32-gui.sourceforge.net/cgi-bin/docs.cgi?doc=tutorial
>
>  and was shocked to see:
>
>  1.  No "use strict" nor "use warnings".

If you look at the tutorial demo code distributed with Win32::GUI (run
win32-gui-demos from a cmd prompt) you'll see that it is all strict
and warnings safe.  There is a line to be drawn somewhere with respect
to clarity of the documentation and 'correctness'.  We'll never satify
everyone with the style used, and so I have tried to err on the side
of keeping the task at hand clear.  This is not supposed to be a
tutorial in good perl coding style, but a tutorial showing the
Win32::GUI concepts.  Patches are always welcome if you think you can
make things clearer.

>  2.  The scripts used global variables to pass around references to the
>  windows, controls, etc..

Again, this is one possible style.  Possibly not a good one, but it
makes it very clear what is being done.   I didn't write the
tutorials, but have inherited their maintainance based on the lack of
anyone else willing to do it.  Again, patches welcome.

>  3.  There were no sender or eventargs arguments.

Before this email I wasn't even aware what these things were.
Remember this is Perl, not some MS language, so you shouldn't expect
the idioms to be the same.  There is more than enough support within
Win32::GUI to provide an interface like this if you'd like to invest
the time in creating all the necessary objects, but there will be a
speed and memory hit from doing so (although it's probably not very
significant).  I think, more importantly, the procedural interface
with the parameters decoded is more familiar to perl programmers.

>  (Not even a $self arg?)  RTFM, I don't see them either.

You probably want to read about the differences between the OEM and
NEM event models (although there's not much in the docs, the samples
provide quite a lot of material, as does searching the list archives).

>  Am I missing something?  I was looking for an OO GUI toolkit in Perl.  I
>  intend to build an application that will feature pop-up forms for
>  editing objects persisted in a database.  My idea is to create a class
>  and a table for each object type.  The class includes a method to create
>  and display a window for editing that type of object.  When the user
>  needs to create/ edit an object, I create an object, stuff it/ get it
>  stuffed with data, and/or create/ display the editor window.  The user
>  may have many such windows open at the same time, including multiple
>  windows from the same class.  When the user interacts with the windows
>  and controls, the event handlers need to be able to find the right
>  object.  Microsoft's "sender" argument solves this need nicely.
>  Microsoft's "eventargs" argument solves other needs nicely.  Does
>  Win32::GUI have equivalents?

Yes, it does.  If the other replies have not helped you find the right
direction, then please post back and we'll see what we can do to help
you - there's nothing very hard if you're familiar with perl (and, in
some cases, the Win32 API).

Regards,
Rob.
>
>
>  TIA,
>
>  David
>
>
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