[Lazarus] Order of OnCreate and OnActivate in Qt4

[Vojtěch Čihák]

Thanks, Kostas, especially part about Qt styling.
 
I answered my solution yesterday, but it didn't appear in ML, it went to zejlko only - I noticed later. So here it is:
 
I don't have QtNativeEventFilter in qtdefines.inc at all.
However, I found simple workaround. I create main form with Visible:=False; and when all other forms are created I do FrmMain.Show; (in *.lpr). The order of events is as expected.
 
Thanks.
 
______________________________________________________________
> Od: "Kostas Michalopoulos via lazarus" <lazarus at lists.lazarus-ide.org>
> Komu: "Lazarus mailing list" <lazarus at lists.lazarus-ide.org>
> Datum: 26.11.2018 11:32
> Předmět: Re: [Lazarus] Order of OnCreate and OnActivate in Qt4
>
I wouldn't rely on event order as anything between the creation to Application.Run could call Application.ProcessMessages - including some components/controls you may be using. As a rule of thumb you should assume that after calling a control (or form) that it can start receiving events.In Qt4 styling is done through native code (QStyle subclasses) and it can alter widgets (QStyle::polish) so it isn't unthinkable that a theme could do something that generates events.
On Sun, Nov 25, 2018 at 6:47 PM zeljko via lazarus <lazarus at lists.lazarus-ide.org <lazarus at lists.lazarus-ide.org>> wrote:On 11/25/2018 04:43 PM, Vojtěch Čihák via lazarus wrote:
 
 > CRASH, because code in OnActivate assumes that FrmContext already exists.
 > 
 > So, Qt4+Plastique has different order of events than Qt4+QtCurve.
 > 
 > Unfortunately, I cannot reproduce with simple demo.
 > 
 > What I'm doing wrong? Do I rely on something that is not guaranteed?
 
 Try to disable usage of QtNativeEventFilter in qtdefines.inc if it's 
 enabled.
 
 zeljko
 -- 
 _______________________________________________
 lazarus mailing list
 lazarus at lists.lazarus-ide.org <lazarus at lists.lazarus-ide.org>
 https://lists.lazarus-ide.org/listinfo/lazarus <https://lists.lazarus-ide.org/listinfo/lazarus>
 
 ----------
 
 -- 
 _______________________________________________
 lazarus mailing list
 lazarus at lists.lazarus-ide.org
 https://lists.lazarus-ide.org/listinfo/lazarus <https://lists.lazarus-ide.org/listinfo/lazarus>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.lazarus-ide.org/pipermail/lazarus/attachments/20181126/5c8f38be/attachment.html>