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Fix issue 4427 - System.InvalidOperationException: Default font family name can't be null or empty #12817

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merged 6 commits into from
Sep 14, 2023
Merged

Fix issue 4427 - System.InvalidOperationException: Default font family name can't be null or empty #12817

merged 6 commits into from
Sep 14, 2023

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mihnea-radulescu
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Fix issue 4427 - System.InvalidOperationException: Default font family name can't be null or empty

Link to issue 4427

What does the pull request do?

Fixes the exception System.InvalidOperationException: Default font family name can't be null or empty occurring on some GNU / Linux operating systems, in particular Arch Linux and variants, through falling back to the first registered system font family, in the absence of a default font family name.

What is the current behavior?

On some GNU / Linux operating systems, in particular Arch Linux and variants, the FontManager constructor throws a System.InvalidOperationException when a defaultFontFamilyName is neither provided through the FontManagerOptions instance, nor can it be resolved using PlatformImpl.GetDefaultFontFamilyName().

What is the updated/expected behavior with this PR?

The PR fixes the issue by falling back to the first registered system font family, in the absence of a provided or resolved default font family name.

Checklist

  • Added new and updated existing unit tests

Fixed issues

Fixes #4427

@mihnea-radulescu
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@dotnet-policy-service agree

@avaloniaui-team
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You can test this PR using the following package version. 11.0.999-cibuild0039277-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

@grokys
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grokys commented Sep 13, 2023

Pinging @Gillibald

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You can test this PR using the following package version. 11.0.999-cibuild0039434-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

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You can test this PR using the following package version. 11.0.999-cibuild0039497-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

@Gillibald
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Can we avoid using Linq to select the first font and instead just use the indexer with a bounds check?

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You can test this PR using the following package version. 11.0.999-cibuild0039540-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

@mihnea-radulescu
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Thank you for the feedback, @Gillibald!

The PR has been updated accordingly.

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You can test this PR using the following package version. 11.0.999-cibuild0039544-beta. (feed url: https://nuget-feed-all.avaloniaui.net/v3/index.json) [PRBUILDID]

@grokys grokys added this pull request to the merge queue Sep 14, 2023
Merged via the queue into AvaloniaUI:master with commit 7b67fda Sep 14, 2023
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Congrats @mihnea-radulescu, you've earned the 0.03 BTC bounty I created some years ago for resolving #4427 🚀

Please send me a Bitcoin address to [email protected]. If you don't yet have a Bitcoin wallet, then a natural choice would be Wasabi Wallet, which is also written with Avalonia.

@nopara73 nopara73 mentioned this pull request Sep 15, 2023
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@kekekeks
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kekekeks commented Sep 15, 2023 •
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Not sure why it got merged, but it's incorrect behavior. The first found font could be some symbol font or a font without any characters even for latin scripts.

e. g. on my machine the first font is /usr/share/fonts/truetype/noto/NotoSansTelugu-CondensedThin.ttf and it looks like this in FontForge:
image

We need to P/Invoke libfontconfig instead.

@mihnea-radulescu mihnea-radulescu deleted the fix/issue-4427 branch September 15, 2023 16:29
@mihnea-radulescu mihnea-radulescu mentioned this pull request Oct 9, 2023
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@maxkatz6 maxkatz6 added the backport-candidate-11.0.x Consider this PR for backporting to 11.0 branch label Dec 7, 2023
@maxkatz6 maxkatz6 added backported-11.0.x and removed backport-candidate-11.0.x Consider this PR for backporting to 11.0 branch labels Jan 17, 2024
maxkatz6 pushed a commit that referenced this pull request Jan 17, 2024
@mihnea-radulescu @maxkatz6
Fix issue 4427 - System.InvalidOperationException: Default font famil…
1fcf325 
…y name can't be null or empty (#12817)

* Fix issue 4427 - System.InvalidOperationException: Default font family name can't be null or empty

* Updated FontManager

* Removed Linq usage from FontManager

---------

Co-authored-by: Mihnea Rădulescu <>
Co-authored-by: Benedikt Stebner <[email protected]>
#Conflicts:
#	src/Avalonia.Base/Media/FontManager.cs
Jeric-X added a commit to Jeric-X/SyncClipboard that referenced this pull request Feb 15, 2024
@Jeric-X
取消Avalonia font异常的workaround(Avalonia fix pr: AvaloniaUI/Avalonia#12817)
2dd0f6a
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@Gillibald Gillibald Gillibald approved these changes

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System.InvalidOperationException: Default font family name can't be null or empty
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@mihnea-radulescu @avaloniaui-team @grokys @Gillibald @nopara73 @kekekeks @maxkatz6