Mike Crider

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Error HRESULT E_FAIL has been returned from a call to a COM component at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)

It looks like an error was thrown from app code. Do you see any exceptions being fired form your app in a custom MeasureOverride implementation?

Error HRESULT E_FAIL has been returned from a call to a COM component at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)

Okay, OnApplyTemplate will typically get called during Measure, so the failure you mentioned hitting in OnApplyTemplate is bubbling out as this Measure error. The parameter to `GetTemplateChild` should be the...

Error HRESULT E_FAIL has been returned from a call to a COM component at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)

Do I understand correctly that your `MySizeChanged` gets called and successfully runs the correct `case` statement and sets the correct values, but you're not seeing any of those value updates...

Error HRESULT E_FAIL has been returned from a call to a COM component at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)

Try changing the `FontSize="24"` to be `FontSize="{TemplateBinding FontSize}"`. The hardcoded 24 on the `` is preventing it from inheriting the FontSize property from the `MyTextBlock` control (since the `FontSize` property...

Error HRESULT E_FAIL has been returned from a call to a COM component at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)

Your custom properties both specify `typeof(MainUI)` as the owner type rather than the control type. Try fixing those to specify TriangleCursor/LoadingIndicator as appropriate and I think that will fix the...

Error HRESULT E_FAIL has been returned from a call to a COM component at ABI.Microsoft.UI.Xaml.IFrameworkElementOverrides.Do_Abi_MeasureOverride_0(IntPtr thisPtr, Size availableSize, Size* result)

Excellent! I'm glad you got it all working.

Closing multi-window app results in unhandled win32 exception.

Likely the same underlying issue as #7564, but happening on window close rather than opening another.

Background acrylic not supported on windows 10

Update: Desktop acrylic on Win10 will be supported starting in 1.2-preview2.

MediaPlayerElement most 4K 60 fps videos cannot seek

Thanks for reporting this. Owners of the underlying MediaPlayer runtime have confirmed that this should work but something about sample media you provided is causing this bug. A bug has...

WinUI MediaPlayerElement

See the [WinUI 3.0 Feature Roadmap](https://github.com/microsoft/microsoft-ui-xaml/blob/main/docs/roadmap.md#winui-30-feature-roadmap) for the latest status on plans, including **Media Controls**. We currently do not have a specific release timeline for MediaPlayerElement.