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Dear friends, any idea on how to change the foreground and background colors of a standard CBS_DROPDOWN (the one in which you can write) combobox (not the FWH one with a TGet on it)?

EMG

Enrico,

Do you mean using FWH code ? Or in pure C ?

Any way will be fine.

EMG

Enrico,

Have a look to WM_CTLCOLORLISTBOX. It should be similar for a ComboBox.

Also, you have to consider that there is an Edit control (TGet in FWH) as a child of the combobox, so the combobox also has to answer to WM_CTLCOLORLISTBOX.

Thanks to your idea I solved my problem this way:

Code: Select all  Expand view

METHOD CtlColor( hWndChild, hDCChild ) CLASS TComboBox

   if lAnd( GetWindowLong( ::hWnd, GWL_STYLE ), CBS_DROPDOWN )
      SetTextColor( hDCChild, ::nClrText )
      SetBkColor( hDCChild, ::nClrPane )

      ::hBkBrush = CreateSolidBrush( ::nClrPane )

      return ::hBkBrush
   endif

return nil

EMG

Enrico,

Excellent, Master

What do you use ::hBkBrush for ? -you always call CreateSolidBrush()-

Antonio Linares wrote:Enrico,

Excellent, Master

What do you use ::hBkBrush for ? -you always call CreateSolidBrush()-

You are right! I have to call it only once, maybe inside Default() method (I already release it inside Destroy() method).

Thank you for pointed it out!

EMG

Enrico,

If you call CreateSolidBrush() always, then you can dinamically change the color of the control on the run.

Antonio,

So, are you suggesting we just do:

return CreateSolidBrush( ::nClrPane )

instead?

James

Antonio Linares wrote:Enrico,

If you call CreateSolidBrush() always, then you can dinamically change the color of the control on the run.

Yes. But at the moment I don't need of this feature.

EMG

James Bott wrote:Antonio,

So, are you suggesting we just do:

return CreateSolidBrush( ::nClrPane )

instead?

James

Almost. But that way you can't release the brush and this will cause a resource leakage. You need to store the handle and release it before create the new brush. And release it once more when the control is destroyed.

EMG

Enrico,

Thanks for the explaination. This feature would be very useful if you wish to color the background different for required fields, then change it to white if the data is entered and vaild. You may remember me discussing this before.

James

Yes, but please notice that you can already do this with FWH dropdown comboboxes as they have a TGet on them. My coloring problem was about standard Windows dropdown comboboxes.

EMG