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Bug Report T307320
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Empty LayoutGroup doesn't appear in the layout after deserialization even after a panel is added into it

created 9 years ago

Hello,

I'm facing strange behavior after restoring layout by calling DockLayoutManager.RestoreLayout from xml. Please open attached sample app.

  1. Run the application and close it by clicking on [X] button so that "layout.xml" file is created in bin folder

  2. Uncomment "#region STEP 2" part in MainWindow.xaml and run the application (it is important that application loads layout of state from #1)
    2.1. Click once on "Attach panel" --> despite the fact code has docked the panel, it is not present in LayoutTree, see Output window
    2.2. Click again on "Attach panel" --> now panel is added to layout correctly, WHY NOW? but IS NOT VISIBLE, see Output Window
    2.3. Toggle "IsClosedInViewModel" --> it has no effect, despite the fact binding is established correctly and is present on Closed property --> Panel is never visible
    2.4. Stop the application by killing it from VS, so that layout is now not saved

  3. Uncomment "#region STEP 3" part in MainWindow.xaml and run the application (it is important that app loads layout of state from #1)
    3.1. Click on "Attach panel" button --> again Panel is not added, see Output
    3.2. Click on "Attach panel" button --> Panel is now added to layout (see output) and IS VISIBLE
    3.3. Toggle "IsClosedInViewModel" --> Panel now shows and hides as expected

2.5. Delete "layout.xml" file and comment back "#region STEP 3" so that you get MainWindow.xaml back to state #2 and run the application
2.6. Click twice on "Attach panel" --> Panel is attached
2.7. Toggle "IsClosedInViewModel" --> now it works as expected

Thus from my observations, I assume that if LayoutGroup is empty at the moment when docking to layout, it somehow switches to invisible mode and stays invisible even after adding some content later. Am I right? If so, how can I avoid it?

As you can see from 2.7. if there is no layout restored, then everything works ok, that's why I suspects it has something to do with restoration.

Thanks
Kind regards
Filip<

Comments (1)
Alexander Russkov (DevExpress) 9 years ago

    Hi Filip,
    Thank you for your sample project and detailed description. I have reproduced this issue and passed this ticket to our developers for further research. We will update this thread as soon as we make any progress.

    Thanks,
    Alexander

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    Answers approved by DevExpress Support

    created 9 years ago (modified 9 years ago)

    We have fixed the issue described in this ticket and will include the fix in our next maintenance update. To apply this solution before the official update, request a hotfix by clicking the corresponding link for product versions you require.

    Note: Hotfixes may be unavailable for beta versions and updates that are about to be released.

      Show previous comments (1)
      Andrey K (DevExpress Support) 9 years ago

        Hi,

        The problem was not fixed completely. I have returned the thread to our developers. Please accept our apologies for the inconvenience.

        Thanks,
        Andrey

        FM FM
        Filip Martinko 1 9 years ago

          No problem, looking forward to another fix :)
          Thanks,
          Filip.

          Andrey K (DevExpress Support) 9 years ago

            Thank you for your patience. Our developers have fixed both issues. I have requested a hotfix for you. Please try it once it is available and let me know whether the problem is gone.

            Thanks,
            Andrey

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