[Lazarus] TWSProgressBar.SetPosition() - what is it for?

[zeljko]

On 03/28/2013 05:56 PM, Graeme Geldenhuys wrote:
> Hi,
>
> I've just added TProgressBar support for LCL-fpGUI, but I find the
> widgetset design extremely confusing.
>
> For example, I implemented TFpGuiWSProgressBar.SetPosition() - the
> component is painted on the form, but the position property was never
> set. Adding a SendDebug() call inside TFpGuiWSProgressBar.SetPosition()
> I noticed that it is _never_ called. Not at the creation of the form,
> and not when you set the ProgressBar.Position property at runtime.
>
> Everything seems to go via the ApplyUpdates() method. I could confirm
> this inside the progressbar.inc file where TCustomProgressBar class is
> implemented. So what is TWSProgressBar.SetPosition() then used for, and
> when is it called?
>
> I had a look at the LCL-Qt widgetset implementation for TProgressBar. I
> can see code duplication (setting the Position information) in
> ApplyUpdates and SetPosition() as well.

Yes, that's something pretty weird in TProgressBar implementation.I've 
asked about it on mailing list few months ago afair, but no answer.

zeljko