TLabel not shown
lazarus / 31-LCL

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qprotex · 2021-01-09 03:18

Hello All,

I just started working with Lazarus for the first time (although I
have experience in Delphi) in a project that needs to be compiled for
Windows, Linux and MacOS. So far I am impressed by Lazarus and the
fact that can compile for multiple OS.

I do work mostly with Windows as my main OS and the project compiles
and behaves fine on it. Now, I believe it is possible to install the
Lazarus Linux/MacOS compilers on Windows, but I decided to install
Lazarus on a Ubuntu 20.04 x64 VM.

This is how the form looks in design time:
https://www.screencast.com/t/i94whyLz2Zw

And this is in run time:
https://www.screencast.com/t/f62QSBHu8BJ

Now, that form is shown while a 3rd form is loading (it takes around
3~5 seconds) and then is closed. I believe the issue is that the form
(or label) is not repainting properly. I have tried different
combinations of repaint/refresh for both the form and the label and
also tried to use Application.ProcessMessages but the label still does
not show. If I show the form with ShowModal then the labels are shown
but I need to make them work with Show, not ShowModal.

Thanks for your help!

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trev · 2021-01-09 05:20

We need to know the versions of Lazarus + FPC and the OS you're using
(it was not clear).

You might find it useful to read How to use the Forums.

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qprotex · 2021-01-09 14:15

Hello trev,

I am using FPC 3.2.0, Lazarus 2.0.10 and Ubuntu 20.04

uname - a shows:
Linux ubuntu 5.4.0-58-generic #64-Ubuntu SMP Wed Dec 9 08:16:25 UTC
2020 x86_64 x86_64 x86_64 GNU/Linux

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trev · 2021-01-10 00:27

This works for me in Ubuntu 20.04:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i procedure
TForm1.Button1Click(Sender: TObject);begin  Form2 :=
TForm2.Create(Nil);  Form2.Caption:='Calculating... Standby'; 
Form2.Position := poMainFormCenter;  Form2.Height := 0; 
Form2.Show;end;
Resulting image is attached.

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jamie · 2021-01-10 01:33

This maybe due to some task scheduling and things are not getting
updated in correct order..
possibly widget troubles with lost font data? resource locks etc..

Maybe the timely process should be started from the message screen 
via the OnShow event? To me that would make more sense.
At least that way the message screen is up and running..

  You could also do the other  task in a thread...