Can not get the correct value of ActualWidth or ActualHeight after Loaded event on Desktop platform

[lindexi]

Current behavior

We can not get ActualWidth or ActualHeight value after Loaded event on Desktop platform. It is different from WinUI's behavior.

    public MainPage()
    {
        this.InitializeComponent();

        Loaded += MainPage_Loaded;
    }

    private void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        Debug.WriteLine($"Width={ActualWidth} Height={ActualHeight}");
    }

You can find the debug output Width=0 Height=0 on Desktop platform, and Width=1024 Height=720 on WinUI platform.

Expected behavior

We can get the correct value of ActualWidth or ActualHeight after Loaded event on Desktop platform. The behavior is same as WinUI platform.

How to reproduce it (as minimally and precisely as possible)

1. Create the empty UNO project.
2. Add the code in MainPage.xaml.cs:

    public MainPage()
    {
        this.InitializeComponent();

        Loaded += MainPage_Loaded;
    }

    private void MainPage_Loaded(object sender, RoutedEventArgs e)
    {
        Debug.WriteLine($"Width={ActualWidth} Height={ActualHeight}");
    }

3. Run the program on Desktop platform and WinUI platform respectively.

And you can find the output in VisualStudio output window is difference on Desktop platform and WinUI platform.

You can find my code in https://github.com/lindexi/lindexi_gd/blob/eb445bd456345de745e16e73c58f3e8f1fe48216/UnoDemo/DalekairwiJebonacaki/DalekairwiJebonacaki/MainPage.xaml.cs

Workaround

No response

Works on UWP/WinUI

None

Environment

Uno.UI / Uno.UI.WebAssembly / Uno.UI.Skia

NuGet package version(s)

global.json:

{
  // To update the version of Uno please update the version of the Uno.Sdk here. See https://aka.platform.uno/upgrade-uno-packages for more information.
  "msbuild-sdks":
  {
    "Uno.Sdk": "5.2.161"
  }
}

Affected platforms

Skia (WPF), Skia (Linux X11), Skia (macOS), Skia (Linux Framebuffer), Skia (GTK)

IDE

Visual Studio 2022

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

Reference : #16120 and #15982 and #15841

[jeromelaban]

This behavior may have changed in latest uno.sdk previews.

[Youssef1313]

@lindexi Were you able to re-test this with the latest dev?

[lindexi]

@Youssef1313 Can I try 5.4.0-dev.464 version?

[Youssef1313]

Yes, but keep in mind if you're using Uno.Sdk, the SDK versioning is different from Uno.WinUI versioning. The latest SDK as of writing this comment is 5.4.0-dev.51 which is using Uno.WinUI 5.4.0-dev.464

[lindexi]

Thank you @jeromelaban and @Youssef1313 . The 5.4.0-dev.51 version Uno.Sdk fixes the behavior.

My test demo code: https://github.com/lindexi/lindexi_gd/tree/bf72c0981965bb4aed7f082ef81eed2e4b6d6913/UnoDemo/DalekairwiJebonacaki

[Youssef1313]

Thank you for confirming. Happy to know it's fixed now.