Inheriting from TCustomComboBox

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2 total messages Started by Rusty Thu, 27 Mar 2003 16:05

#17274

Author: Rusty
Date: Thu, 27 Mar 2003 16:05

14 lines
1563 bytes

Greetings:

I am trying to make a custom combo box that is like the TColorBox component
but has additional support for colors with alpha.  The problem I'm having is
that I can't seem to override the DrawItem method.  In my derived class, the
function declaration is the same as the one in its parent's class,
TCustomComboBox.  The declaration looks like this:

virtual void __fastcall DrawItem(int Index, const Types::TRect &Rect,
Windows::TOwnerDrawState State);

In my class, I have it declared exactly as shown above, but it never gets
called from my control.  Instead, it calls the parent class's DrawItem
method.  Any ideas what I am doing wrong?

Re: Inheriting from TCustomComboBox

#17275

Author: Rusty
Date: Thu, 27 Mar 2003 16:48

18 lines
1438 bytes

Nevermind.  I wasn't setting the Style property correctly.  If you're
curious, I was doing the following:

inherited::Style << csOwnerDrawFixed;
FStyle << cbStandardColors
           << cbExtendedColors
           << cbSystemColors;

Instead, I should have been doing this:

inherited::Style = csOwnerDrawFixed;
FStyle = FStyle.Clear( );
FStyle << cbStandardColors
          << cbExtendedColors
          << cbSystemColors;

All the Best,
Rusty

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