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  1. #1
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    LongListMultiSelector scroll issue/bug

    I've discovered a scroll issue with the LongListMultiSelector (The Windows Phone Toolkit, I have yet to reproduced it with the LongListSelector).
    The problem seem to arise when you have a list of items with images that is of different sizes or takes some time to load.
    The isssue is when you scroll to the bottom and try to scroll to the top after that you will not reach the top but a couple of items before the top item. The list thinks you are at the top.
    I've attached a sample project. (Follow the link to codeplex)
    (The first time I tried to post this issue my wifi died so this post is shorter, hope you understand the issue)

    Steps to reproduce:
    Start the app on device. (not reproduced on emulator)
    Before the list has loaded the images, start to scroll quick to the very bottom.
    At the bottom, wait a second or two.
    Then start to scroll to the top.
    (If you have reached the top, close the app and goto step 1.)
    Reproduced on:
    Nokia 1020 (amber)
    Nokia 928 (gdr3 dev preview)

    Is this a bug or am I doing something wrong?
    I have a published app with this issue so any help is appreciated since the users has started to notice this issue.

    Codeplex bug reported with sample project:
    https://phone.codeplex.com/workitem/11480

  2. #2
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    Re: LongListMultiSelector scroll issue/bug

    Is it a WP7 or WP8 project, or both?

  3. #3
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    Re: LongListMultiSelector scroll issue/bug

    It is a WP8 project.
    With the latest Windows Phone Toolkit.

  4. #4
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    Re: LongListMultiSelector scroll issue/bug

    Quote Originally Posted by cafebici View Post
    It is a WP8 project.
    With the latest Windows Phone Toolkit.
    Ok, in that case, be aware that you're not using the LongListSelector from the WP Toolkit under WP8, as it's part of the phone's native SDK - so you might want to find a way to report the bug to the Windows Phone team.

    Also, do you have access to any 3rd party controls? eg. Telerik (they might have a control without this bug)

  5. #5
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    Re: LongListMultiSelector scroll issue/bug

    Yes, I know that the LongListMultiSelector is using the LongListSelector from the Windows Phone native SDK.
    But I haven't been able to reproduce the issue when using the LongListSelector directly.
    Only with the LongListMultiSelector so it feels like an issue with the toolkit.

    I have a token for Telerik but haven't used it yet since I haven't found the need for it.
    Last edited by cafebici; 2014-01-07 at 20:45. Reason: wrote WP Toolkit instead of Windows Phone native SDK on the first line.

  6. #6
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    Re: LongListMultiSelector scroll issue/bug

    I have changed my list component to Teleriks now. Their list doesn't have this issue.

  7. #7
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    Re: LongListMultiSelector scroll issue/bug

    Quote Originally Posted by cafebici View Post
    I have changed my list component to Teleriks now. Their list doesn't have this issue.
    Glad to hear you found a work-around. I use the Telerik components where possible and if I do have an issue, their tech. support is great and will usually a) get a fix that you can use b) incorporate the fix into the next release.

    Sadly, progress and/or feedback on the WP Toolkit is very slow.

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