Fix SKLottieView animation not starting in CarouselView by Copilot · Pull Request #337 · mono/SkiaSharp.Extended

Copilot · 2026-02-05T03:10:35Z

SKLottieView animations fail to start when initially visible in CarouselView. The animation timer checks Window != null but stops immediately because Window is null during initial layout. The Loaded event doesn't re-fire when Window is later assigned.

Changes

Override OnPropertyChanged in SKAnimatedSurfaceView: Monitor Window property and call UpdateIsAnimationEnabled() when Window transitions from null to non-null, restarting the animation timer
Add test AnimationStartsWhenWindowBecomesAvailable: Verify animation starts after Window assignment using polling to avoid timing flakiness

Impact

Fixes animations in any scenario where views are created before Window assignment (CarouselView, virtualized containers, lazy-loaded views).

protected override void OnPropertyChanged(string? propertyName = null)
{
    base.OnPropertyChanged(propertyName);

    if (propertyName == nameof(Window))
    {
        if (Window is not null)
            UpdateIsAnimationEnabled();
    }
}

Warning

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I tried to connect to the following addresses, but was blocked by firewall rules:

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- Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/5B74F40C93A078C72D8DF238B871667A/missingpackages_workingdir --packages /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/missingpackages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal --configfile /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/nugetconfig/nuget.config --force -l IsLoadedEx rmExtensions.shared.cs cal/bin/grep (dns block)
ytvvsblobprodcus310.vsblob.vsassets.io
- Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/78EB6D0660D838F92C07DD472AF09142/missingpackages_workingdir --packages /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/missingpackages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal --configfile /home/REDACTED/work/SkiaSharp.Extended/.codeql-scratch/dbs/csharp/working/nugetconfig/nuget.config --force dbs/csharp/working/emptyFakeDotnetRoot /dbs/csharp/working/emptyFakeDotnetRoot aui/Controls/Confetti/SKConfettiSystem.shared.cs ndor/bin/grep (dns block)

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Original prompt

This section details on the original issue you should resolve

<issue_title>Issue: First Lottie Animation Not Displaying in .NET MAUI CarouselView</issue_title>
<issue_description>Moved Issue From dotnet/maui#29650

Description

I’m using .NET MAUI with SkiaSharp.Extended.UI.Maui 2.0.0 and trying to show a Lottie animation inside a CarouselView. My code works correctly for every item except the first one—the animation does not show at all. Only the text shows.

If I change the CarouselView.Position to 1, then the second item’s animation disappears instead. It seems like whichever item is initially rendered does not show the animation, while all others do.

Here's a simplified version of the setup:
   <CarouselView
      x:Name="WalkthroughCarousel"
      ItemsSource="{Binding WalkthroughItems}"
      VerticalOptions="FillAndExpand">
     <CarouselView.ItemTemplate>
        <DataTemplate x:DataType="uiEntities:WalkthroughItem">
            <StackLayout Padding="20" Spacing="20">
                <skia:SKLottieView
                    HeightRequest="300"
                    WidthRequest="300"
                    Source="{Binding AnimationFile}"
                    IsAnimationEnabled="True"
                    RepeatCount="-1"
                    RepeatMode="Restart" />
                <Label Text="{Binding Title}" FontSize="24" />
                <Label Text="{Binding Description}" FontSize="16" />
            </StackLayout>
        </DataTemplate>
    </CarouselView.ItemTemplate>
   </CarouselView>
public partial class MainPageViewModel : ViewModelBase
{
    private int currentIndex = 0;

    [ObservableProperty]
    private ObservableCollection<WalkthroughItem> walkthroughItems = [];

    public MainPageViewModel()
    {
        
        WalkthroughItems = [

            new WalkthroughItem
            {
                AnimationFile = SKLottieImageSource.FromFile("woman_feelings_flowing.json"),
                Title = "Talk it Out",
                Description = "Reflect on your feelings through safe conversations."
            },
            new WalkthroughItem
            {
                AnimationFile = SKLottieImageSource.FromFile("tallman.json"),
                Title = "Name the Feeling",
                Description = "Track emotional reactions with a single tap."
            },
            new WalkthroughItem
            {
                AnimationFile = SKLottieImageSource.FromFile("thinkinglamp.json"),
                Title = "Understand Yourself",
                Description = "Gain insights and make peace with your emotions."
            }
        ];
    }
}
public class WalkthroughItem
{
    public object AnimationFile { get; set; }
    public string Title { get; set; } = string.Empty;
    public string Description { get; set; } = string.Empty;
}
Steps to Reproduce

No response

Link to public reproduction project repository

No response

Version with bug

9.0.0 GA

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

Android, I was not able test on other platforms

Affected platform versions

Android 14 API 34

Did you find any workaround?

Not yet I even tried to change positions and played around like added a dummy item and then removed it and still didn't work.

Relevant log output
```</issue_description>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

Fixes Issue: First Lottie Animation Not Displaying in .NET MAUI CarouselView #311

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.

Add OnPropertyChanged override to restart animation when Window becomes available. This handles scenarios where views are created before Window is assigned. Also add test to verify the fix. Co-authored-by: mattleibow <1096616+mattleibow@users.noreply.github.com>

Co-authored-by: mattleibow <1096616+mattleibow@users.noreply.github.com>

Initial plan

cef31c7

Copilot AI assigned Copilot and mattleibow Feb 5, 2026

Copilot started work on behalf of mattleibow February 5, 2026 03:21 View session

Copilot AI and others added 2 commits February 5, 2026 03:24

Improve test robustness with polling and add explanatory comments

bed4563

Co-authored-by: mattleibow <1096616+mattleibow@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix first Lottie animation not displaying in CarouselView~~ Fix SKLottieView animation not starting in CarouselView Feb 5, 2026

Copilot AI requested a review from mattleibow February 5, 2026 03:28

Copilot finished work on behalf of mattleibow February 5, 2026 03:28

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Comments

Fix SKLottieView animation not starting in CarouselView#337

Fix SKLottieView animation not starting in CarouselView#337
Copilot wants to merge 3 commits intomainfrom
copilot/fix-first-lottie-animation-issue

Copilot AI commented Feb 5, 2026 •

edited

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Impact

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Description

Steps to Reproduce

Link to public reproduction project repository

Version with bug

Is this a regression from previous behavior?

Last version that worked well

Affected platforms

Affected platform versions

Did you find any workaround?

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Copilot AI commented Feb 5, 2026 •

edited

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