radDropDownList flashes previous list

4 posts, 1 answers
  1. Terry
    Terry avatar
    4 posts
    Member since:
    Mar 2013

    Posted 29 Jul Link to this post

    I have two radDropDownLists.  The contents of the second list change based on the item selected in the first list.  When an item is selected in the first list, select the down arrow for the second list, and you see list2 for the item selected in list1.  Select another item in list1, and the program changes the items in list2.  When you select the down arrow for list2, you see the previous list items flash before the list is updated with list items that correspond to the selection in list1.  You can see this demonstrated in Telerik's Demo Application - UI for WinForms.  Select DropDown & List and then select First Look.  In this example, you select an artist in list1 and the artist's albums are listed in list2.  Select artist1 and see artist1's albums in list2.  Select artist2 and briefly see artist1's albums flash in list2 and then see artist2's albums.  Is there a way to get the list to update before it is displayed so there is not flashing of the previous list?
  2. Dimitar
    Admin
    Dimitar avatar
    1408 posts

    Posted 01 Aug Link to this post

    Hello Terry,

    Thank you for writing.

    I have recorded and attached a small video that shows how I am testing this. However, there is no flashing on my side. Could you please check the video and see if am properly testing this? Could you record the flashing on your side and send it to us? 

    I am looking forward to your reply.

    Regards,
    Dimitar
    Telerik by Progress
    Check out the Windows Forms project converter, which aids the conversion process from standard Windows Forms applications written in C# or VB to Telerik UI for WinForms.For more information check out this blog post and share your thoughts.
  3. UI for WinForms is Visual Studio 2017 Ready
  4. Terry
    Terry avatar
    4 posts
    Member since:
    Mar 2013

    Posted 01 Aug in reply to Dimitar Link to this post

    Yes, you can see the flash issue in the video you have attached.  Pause the video and drag the slider very slowly through the 26th and 27th second.  When the down arrow is selected you can see the list flash "Tuesday Night Music Club" and "Sheryl Crow", and then quickly switch to "Mountain Battles".  The flash is quicker and less noticeable in the video than on my machine, but it is still there.  After starting this thread, I found that I can get rid of the flash by setting DropDownAnimationEnabled property to false.  This is an acceptable solution for me, but I would recommend getting the contents of the dropdown completely changed before displaying it.
  5. Answer
    Dimitar
    Admin
    Dimitar avatar
    1408 posts

    Posted 02 Aug Link to this post

    Hello Terry,

    I can see the flashing now and indeed when the animation is disabled this does not occur. I have logged this in our Feedback Portal. This way our developers will be able to further investigate this and determine if this can be improved. You can track the item for status changes and add your vote for it here.

    Your Telerik Points have been updated for this report.

    Should you have any other questions do not hesitate to ask.
     
    Regards,
    Dimitar
    Telerik by Progress
    Check out the Windows Forms project converter, which aids the conversion process from standard Windows Forms applications written in C# or VB to Telerik UI for WinForms.For more information check out this blog post and share your thoughts.
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