Bug in Qt 5.12 drag n'drop ?

SGaist · 14 Dec 2018, 22:35

Can you spot any difference between the example and what you do in your application ?

skylendar · S SGaist 14 Dec 2018, 22:18

@SGaist

Yes, "robot" works but not my app, which is not that different, at least about dnd

SGaist · 14 Dec 2018, 22:39

"not that different" can be a big can of worm ;)

skylendar · 14 Dec 2018, 22:42

@SGaist

wait, i'm testing again..

skylendar · 14 Dec 2018, 22:44

@skylendar

Ah, "robot" is based on a QGraphicsObject, which receives QGraphicsSceneDragDropEvent , whereas my app is based on a mere QWidget, which receives a QDragEnterEvent

skylendar · wrote on 14 Dec 2018, 22:44

@skylendar

And remember, my code works fine with qt5.11.x, and not with qt5.12.0

Christian Ehrlicher · 15 Dec 2018, 16:06

Please provide a example - otherwise I don't see how we can spot the problem...

skylendar · wrote on 15 Dec 2018, 16:06

@Christian-Ehrlicher

Ok, in that case, get my open source app:
https://sourceforge.net/projects/skylendar/
and compile it with qt5.12.0
When compiled and running, drag the "Now" Dataset (on the left column) onto the window named "Standard wheel".

Then, the pointer becomes a barred red circle, instead of a black hand for dropping, i.e. dropping is impossible.

When compiled with 5.11 apparently nothing happens because the standard wheel already uses "Now", but it works...

Christian Ehrlicher · 15 Dec 2018, 16:30

I tried to run your app but I won't let something run as root on my system. Please provide a minimal, compilable example to reproduce the issue.

aha_1980 · 15 Dec 2018, 16:40

@Christian-Ehrlicher

I tried to run your app but I won't let something run as root on my system.

probably the elevated rights are part of the problem?

Christian Ehrlicher · wrote on 15 Dec 2018, 16:40

@aha_1980 said in Bug in Qt 5.12 drag n'drop ?:

probably the elevated rights are part of the problem?

Don't think so - it's using a database and the app which creates the schema etc. wants admin rights. After this it looks like the normal application can run without admin rights but did not came that far.

skylendar · wrote on 15 Dec 2018, 16:44

@aha_1980

No, only skydmin needs admin right in order to install the db. skylendar runs as a normal user.

skylendar · 15 Dec 2018, 16:54

@aha_1980

If you really are scared to run skydmin as root, I can tell you how to install the db as the postgres non-root user.

aha_1980 · 15 Dec 2018, 17:00

@skylendar Thanks, but I don't think I'll debug your program ;)

I have too much of my own problems

skylendar · wrote on 15 Dec 2018, 17:00

@aha_1980

I don't ask you to debug my app, just run it.

skylendar · 15 Dec 2018, 17:28

@aha_1980

In addition, I don't want anything. I just signal a possible bug. That's all.

aha_1980 · 15 Dec 2018, 17:50

@skylendar thats why we need a simple program, trimmed down to the actual problem.

Otherwise its hard to track down where the bug is. Until now it is not even proven that Qt is guilty.

skylendar · wrote on 15 Dec 2018, 17:50

@aha_1980

This is not a matter of guilt or not. We are not in an american thriller.
And besides, how do you explain that my app works fine with qt5.11 and below, but not with qt5.12 ?

skylendar · 15 Dec 2018, 18:22

@aha_1980

And you forget something: Qt is actually a commercial program, and most of you, if not all, are paid for debugging it. Why should I work for you for free ?

mrjj · wrote on 15 Dec 2018, 18:22

@skylendar

Qt is actually a commercial program, and most of you, if not all, are paid for debugging it

Actually this is a user forums and no one here is paid anything to help :)
We are not employees, but ordinary users of Qt.

Anyway, i tried some of old drag drop sample with Qt 5.12 and
they seems to work. At least on windows.