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  1. Qt
  2. QTBUG-109826

Drag and drop in QML in Linux: After dropping, a part of the GUI does no longer react to mouse moves

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Details

    • Bug
    • Status: Need More Info
    • P2: Important
    • Resolution: Incomplete
    • 6.4.1
    • None
    • None
    • Linux/Wayland

    Description

      Hi dear Qt devs,

      It's me again!

      I am still on my way porting my app OpenTodoList to Qt6. Most of the porting is done and the app generally works on all platforms. However, I noticed something strange on Linux/Wayland:

      In my app, I can reorder items in a view via drag and drop. This works fine on all platforms. However, in the case of Linux/Wayland, the items behave strangely after the drag&drop finished. Parts of the GUI don't seem to detect mouse moves anymore and they don't revert their state to what would be expected after the drag&drop finished.

      Its a bit difficult to describe, so I made a short screencast that demonstrates the issue:

      As you can see, once the item is dropped, the model is updated. However, the items behave incorrectly:

      • The item from where I started the drag remains highlighted.
      • The handles I use for reordering remain visible (although they should be hidden once no longer hovered).
      • For the other items, they don't react to hovered at all (i.e. their drag handle doesn't become visible).

      The rest of the GUI is still functional, though. I can e.g. scroll using the mouse wheel (as can be seen in the video as well).

      Interestingly, when starting the app with -platform xcb, the problem does not occur. So it's solely an issue on Wayland. Other platforms also behave correctly (from what I tested so far).

      For reference, the code of the app is on GitLab: https://gitlab.com/rpdev/opentodolist (on the development branch). The main code that handles drag and drop is in these components:

      If you need any further input from my side, please let me know!

      Thanks!

       

       

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            qt.team.graphics.and.multimedia Qt Graphics Team
            mhoeher Martin Höher
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