ride_wind
Topic Author
Posts: 34
Joined: 07 Feb 2018, 03:33

ComboBox Bug in UE4

15 Mar 2018, 12:59

Hi,
I am having trouble using the combobox in UE4.
My ComboBox has many items and a scrollbar.
Open it, Use mouse left key drag scrollbar to up or down, Click other control, and then the ComboBox don't Close.
UE4ComboBox.gif
Click the gif image to see.
 
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sfernandez
Site Admin
Posts: 1911
Joined: 22 Dec 2011, 19:20

Re: ComboBox Bug in UE4

15 Mar 2018, 14:30

Hi, it seems this bug is happening not only in UE4 integration. It is a problem with ComboBox mouse capture being lost when scrollbar is dragged.
Could you please report it in our bugtracker?

Thanks for your collaboration.
 
ride_wind
Topic Author
Posts: 34
Joined: 07 Feb 2018, 03:33

Re: ComboBox Bug in UE4

16 Mar 2018, 03:39

I report it, Thanks.

Besides, We can drag ListBoxItem to up or down In UE4, but ComboBoxItem is not.

So, How to achieve ComboBoxItem drag not using scrollbar ?
 
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sfernandez
Site Admin
Posts: 1911
Joined: 22 Dec 2011, 19:20

Re: ComboBox Bug in UE4

16 Mar 2018, 10:30

The problem with ComboBox is related to its default style that doesn't have PanningMode set. We will fix this in our style in a future release.

Meanwhile you can set it locally like this:
<ComboBox ScrollViewer.PanningMode="VerticalFirst">
And if you want to enable virtualization and pixel scrolling you can use a VirtualizingStackPanel as ItemsPanel:
<ComboBox ScrollViewer.PanningMode="VerticalFirst" ScrollViewer.CanContentScroll="True" VirtualizingPanel.ScrollUnit="Pixel">
  <ComboBox.ItemsPanel>
    <ItemsPanelTemplate>
      <VirtualizingStackPanel/>
    </ItemsPanelTemplate>
</ComboBox>
 
ride_wind
Topic Author
Posts: 34
Joined: 07 Feb 2018, 03:33

Re: ComboBox Bug in UE4

19 Mar 2018, 12:45

The problem with ComboBox is related to its default style that doesn't have PanningMode set. We will fix this in our style in a future release.

Meanwhile you can set it locally like this:
<ComboBox ScrollViewer.PanningMode="VerticalFirst">
And if you want to enable virtualization and pixel scrolling you can use a VirtualizingStackPanel as ItemsPanel:
<ComboBox ScrollViewer.PanningMode="VerticalFirst" ScrollViewer.CanContentScroll="True" VirtualizingPanel.ScrollUnit="Pixel">
  <ComboBox.ItemsPanel>
    <ItemsPanelTemplate>
      <VirtualizingStackPanel/>
    </ItemsPanelTemplate>
</ComboBox>
Very thanks, This is my need.

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