B4J Question Strange behaviour in my B4X-Launcher v3

[Cableguy]

Hi Guys...

I know questions should and are meant to every user in the forum, but sometimes, we need the Master (read @Erel) opinion.

my B4X-Launcher v3 is having a strange behaviour... I set the first Imageview, the only one visible when the app starts, to be top=0 and i never change this position again in my code.
I change the alpha value when the mouse enters the image view, and change it again after a few seconds...
After a while, I notice that the top value of that imageview has changed for about its height... and after another while, it keeps increasing the top value, apparently in height values...

I just can't figure out where this change is happening!

 

[Erel]

You need to try to reproduce it in a small project and upload the project.

 

[Cableguy]

this is as streamlined as I could get.
Note. I have decided to re-position the B4XLogo in the Tick event so that at least it comes back to the original position..

how to reproduce it:
launch the app in a laptop, check its position, close the lid, wait for the laptop to "sleep", then open the lid and wake it up...

 

[Erel]

I haven't tested it on a laptop. Does it work properly after you set the top property again?

If you do want to debug it then you can add log messages and check the window position. It is also worth testing it with regular window instead of the transparent one.

Overall it sounds like a JavaFX bug.

 

[Cableguy]

I would say a jfx bug as my window top value is -15 (I guess this has to do with the undecorated attribute) and it seem to be reverting to windows top = 0

The re-set of the top value when the timer expires works as expected, but doesn't prevent that sometimes the top value is off.
I think I shoul be re-seting the top in another event, like window.hasFocus, but I dont' think it there's such a parameter

 

[Cableguy]

So, making further tests, I found that Form_FocusChanged exists in B4J, and i have managed to minimize, but not completely mitigate the reported behavior.

my focus changed sub:

Private Sub MainForm_FocusChanged (HasFocus As Boolean)
    Log(MainForm.WindowTop)
    MainForm.WindowTop = -15
End Sub

the logs show this:

-15 'this is appstart
-15 'I closed the lid of the laptop
0 'I opened the lid of the laptop
-15 'value re-set, a small time lapse exist that I can't get rid of