Most of these triggers has been moved to the Windows Community Toolkit and is where you'll see future enhancements happen. See:

• Repo: https://github.com/windows-toolkit/WindowsCommunityToolkit
• Docs: https://docs.microsoft.com/en-us/windows/communitytoolkit/helpers/triggers
• Announcement: https://blogs.windows.com/windowsdeveloper/2020/06/15/announcing-windows-community-toolkit-v6-1/

A collection of custom visual state triggers

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See here for details: https://github.com/sponsors/dotMorten

Get it on nuget:

   PM> Install-Package WindowsStateTriggers 

See more information on my blog: http://www.sharpgis.net/post/2015/03/24/Using-Custom-Visual-State-Triggers

• DeviceFamilyStateTrigger: Trigger based on the device family (Desktop, Mobile, IoT or Team)
• NetworkConnectionStateTrigger: Trigger if internet connection is available or not
• OrientationStateTrigger: Trigger based on portrait/landscape mode
• IsTrueStateTrigger: Trigger if a value is true - REMOVED ! use StateTrigger and bind to IsActive
• IsFalseStateTrigger: Trigger if a value is false
• IsNullOrEmptyStateTrigger: Trigger if an object is null, or if a String or IEnumerable is empty
• IsTypePresentStateTrigger: Trigger if a type is present (ie hardware backbutton etc)
• EqualsStateTrigger: Trigger if Value is equal to EqualTo
• NotEqualStateTrigger: Trigger if Value is not equal to NotEqualTo
• CompareStateTrigger: Trigger if Value is equal, less than or greater than CompareTo
• InputTypeTrigger: Trigger based on the PointerType you're using on the TargetElement
• RegexStateTrigger: This trigger evaluates a regular expression against a string and triggers if a match is found.
• CompositeStateTrigger: This trigger combines other triggers using, And, Or or Xor to create even more powerful triggers.

Run the test app to see a set of examples of these in use.