Hello Lazarus-List,

I'm trying to understand the widgetset know-how. I'm able to understand, more or less, the usual TButton, TEdit, TMemo, etc, in other words the TWinControl descendants. Now I'm trying to deal with TLabel, but it is not a TWinControl, so I'm lost how it gets draw in the form :-?

Must I override something in TControl ? I only wish to get some indication that it is in the form, as my code reach the DrawText procedure for TLabel and I'm not completly sure if I'm not properly drawing or not properly answering some LCL requests to perform the draw.

So in other words, how the LCL handles the TLabel as it is not a platform widget (I know that there is a TWSCustomLabel).

Thank you.

Zitat von Jos? Mejuto :

TLabel is a TCustomLabel is a TGraphicControl is a TControl.

TGraphicControl catches LM_PAINT messages, which are sent by its parent TWinControl. The parent TWinControl has a Handle/Widget.

Mattias

Jos? Mejuto wrote

Now I'm trying to deal with TLabel, but it is not a TWinControl, so I'm lost how it gets draw in the form :-?

TWinControl paint handler draws child controls on own canvas. It clips their rect by requested rectangle and offsets (0, 0) corrd to control Left,Top. So control thinks that it draws on a canvas with 0,0,Width,Height geometry.

Best regards,
Paul Ishenin.

What you are asking is documented here:

http://wiki.lazarus.freepascal.org/LCL_Internals#Implementing_TLabel

Hello Lazarus-List,

Monday, March 29, 2010, 6:33:11 PM, you wrote:

FMdC> What you are asking is documented here:
FMdC> http://wiki.lazarus.freepascal.org/LCL_Internals#Implementing_TLabel

I had read it already, in fact the whole page, but as my "label" is not receiving the paint message I think that I miss something in the path and look for any hint that spot my error.

I'll recheck everything. Thank you.