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SfListView blink issue while creating/reusing cells.

This is my code:

```xaml
<syncfusion:SfListView
            ItemSize="150"
            ItemSpacing="3"
            ItemsSource="{Binding Staffs}"
            RowSpacing="3"
            SelectionMode="None">
            <syncfusion:SfListView.LayoutManager>
                <syncfusion:GridLayout SpanCount="5" />
            </syncfusion:SfListView.LayoutManager>
            <syncfusion:SfListView.ItemTemplate>
                <DataTemplate>
                    <Grid x:DataType="dto:StaffDto" CompressedLayout.IsHeadless="True">
                        <Button
                            BorderColor="#386179"
                            BorderWidth="7.5"
                            IsEnabled="False" />
                        <Label
                            Margin="13"
                            FontFamily="{StaticResource OpenSansBold}"
                            FontSize="Small"
                            HorizontalOptions="Center"
                            LineBreakMode="WordWrap"
                            Text="{Binding UserName, Mode=OneTime}"
                            TextColor="Blue"
                            VerticalOptions="Center" />
                    </Grid>
                </DataTemplate>
            </syncfusion:SfListView.ItemTemplate>
            <syncfusion:SfListView.DataSource>
                <data:DataSource>
                    <data:DataSource.SortDescriptors>
                        <data:SortDescriptor Direction="Ascending" PropertyName="UserName" />
                    </data:DataSource.SortDescriptors>
                </data:DataSource>
            </syncfusion:SfListView.DataSource>
        </syncfusion:SfListView>
```

In the view model, I've got an observable collection with more than 10.000 rows. In android & iOS everything works perfect, but on UWP, I'm experiencing this issue. There is no high memory usage (50MB only) & there is no high CPU usage (5% only).

It seems you're calculating something wrong. You've to reuse/create cells before they become appears to the user just like your android/ios implementations.

I've also provided a video.

9 Replies
RS Rawoof Sharief Muthuja Sherif Syncfusion Team August 23, 2018 11:28 AM UTC

Hi Yaser, 

Thanks for contacting Syncfusion support. 

We have checked the reported query “Blink issue in UWP platform” from our end. In the update we did not find any attachment which you have mentioned in the previous update. We have prepared the sample based on the template you have shared. We have notice that the last item get blink when scroll the listview items. Can you please confirm the issue which you have faced and please share the video which replicates the reported issue which would highly help us to analyze the query better. 

For your reference we have attached the sample and you can download it from the below link. 


Regards, 
Rawoof M. 


YM Yaser Moradi August 23, 2018 01:07 PM UTC

Hi again.

I'm experiencing the same exact issue. At first, I thought I'm having a look at my own app!

I tried to attach a movie, no luck )-:

Is it required?

Thanks in advance

AA Arulraj A Syncfusion Team August 24, 2018 12:02 PM UTC

Hi Yaser  
  
Sorry for the inconvenience.  
  
We would like to know that the “Last item flickers while scrolling” is a known issue in UWP platform which has been fixed in the 16.2.0.46 version. Can you please let us know the version of SfListView and Xamarin forms you are using? 
 
If the issue still exist in the latest version, please share the video that replicates the issue which would help us to analyze the issue at our end better and provide appropriate solution.  
  
Regards, 
Arulraj A 


YM Yaser Moradi August 24, 2018 12:15 PM UTC

Hi. YW (:

Package versions:

Syncfusion.Xamarin.SfListView" Version="16.2.0.46"
Xamarin.Forms" Version="3.1.0.697729"
"Microsoft.NETCore.UniversalWindowsPlatform" Version="6.1.7"
Min SDK: 16299 Target SDK: 17134
Windows 10.17134.228 X64
Graphic Card: Intel 630


Attachment: BlinkIssue_5d508db0.zip

DY Deivaselvan Y Syncfusion Team August 27, 2018 09:05 AM UTC

Hi Yaser,

We regret for the inconvenience.

We can reproduce the reported issue in the specified version 16.2.0.46 and confirmed it as defect. We have logged defect report for this. The fix will be included in our upcoming 2018 Volume 3 main release which is scheduled to be rolled out by end of September 2018. We will appreciate your patience until then. 

Regards,
Deivaselvan 


YM Yaser Moradi August 27, 2018 10:01 AM UTC

Fine. Thanks (:

JN Jayaleshwari N Syncfusion Team August 28, 2018 10:51 AM UTC

Hi Yaser, 
 
Thanks for the update. We appreciate your patience until then. 

Regards, 
Jayaleshwari N.  


JN Jayaleshwari N Syncfusion Team September 16, 2018 02:37 PM UTC

Hi Yaser, 
 
We are glad to announce that our Essential Studio 2018 Volume 3 beta Release v16.3.0.17 is rolled out and is available for download under the following link.  
  
   
The reported issue “In UWP, scrolling is not working properly when using the mouse wheel” has been resolved and included in this release .We thank you for your support and appreciate your patience in waiting for this release. Please get in touch with us if you would require any further assistance.  
  
Regards,  
Jayaleshwari N. 


JN Jayaleshwari N Syncfusion Team September 24, 2018 05:40 AM UTC

Hi Yaser, 
 
We are glad to announce that our Essential Studio 2018 Volume 3 Release v16.3.0.21 is rolled out and is available for download under the following link.   
 
The reported issue “In UWP, scrolling is not working properly when using the mouse wheel” has been resolved and included in this release. We thank you for your support and appreciate your patience in waiting for this release. Please get in touch with us if you would require any further assistance.   
 
Regards, 
Jayaleshwari N 


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