Replace TControl.SetVisible and TControl.SetEnabled

From: Alexander Muylaert (ask_at_hotmail.com)
Date: 06/25/04 

Date: Fri, 25 Jun 2004 09:01:34 +0200

Hi

I'm developing a component for security. The current security system
requires a rebuild of the entire VCL since it implements 2 extra properties
to TControl. SecurityVisible and SecurityEnabled.

I don't like this approach, it is a lot of work before everything is
recompiled on each machine. I rather have the Visible and Enabled
properties handled by a "third" party.

I have rewritten a component that hooks to the control. I only have one
problem. I need to know when something in the application is changing the
visible or enabled property of the control. Currently I hook to the
CM_VISIBLECHANGED and CM_ENABLECHANGED. Unfortunatly this only works when
the property is really changed.
If the visible is set to true from somewhere in the app, I might need to
reset this to false because of security reasons. So if the developer of the
application would set this again to false, I don't get the message. And I'll
never know the developer wants this component invisibile.

I need to hook into the setvisible and setenabled without changing anything
in the VCL-source. I know the people from Fastcode can help me, something
likewise is done in fastmove. The hack should work only on D7.

Kind regards and many thanks

Alexander

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