Theme Style Sheet (TSS) files are regular USS files. UI Toolkit treats TSS as a distinct asset type and uses it for management purposes.
Regular USS syntax and format apply to TSS files, but usually, a theme file contains references to other USS files through the @import
rule.
Note: USS files also support the @import
rule.
You can create different TSS files for different themes and switch between them at runtime. You can use TSS to customize the look and feel for different platforms or devices. You can also create TSS to use different fonts for different languages if your games or applications support multiple languages.
When you add your first UIDocument to a GameObject in your project, it generates a default runtime theme asset at Assets/UI Toolkit/UnityThemes/UnityDefaultTheme.tss
. You can inherit from it, and overwrite or add new styles to create your custom theme.
To create a new TSS:
You can reference a TSS in UXML or C# the same way as you do with USS.
You can also set a TSS as the default theme for a Panel Setting asset. If you have more than one Panel Setting, each one can use a different TSS file.
You can use the @import
rule or the TSS asset’s Inspector window to inherit a theme.
The syntax for the @import
rule is:
@import url("<path-to-file>/fileName.tss");
To inherit a theme in the Inspector window:
You can use the @import
rule or the TSS asset’s Inspector window to import a style sheet.
The syntax for the @import
rule is:
@import url("<path-to-file>/fileName.uss");
To import a style sheet in the Inspector window:
Did you find this page useful? Please give it a rating:
Thanks for rating this page!
What kind of problem would you like to report?
Thanks for letting us know! This page has been marked for review based on your feedback.
If you have time, you can provide more information to help us fix the problem faster.
Provide more information
You've told us this page needs code samples. If you'd like to help us further, you could provide a code sample, or tell us about what kind of code sample you'd like to see:
You've told us there are code samples on this page which don't work. If you know how to fix it, or have something better we could use instead, please let us know:
You've told us there is information missing from this page. Please tell us more about what's missing:
You've told us there is incorrect information on this page. If you know what we should change to make it correct, please tell us:
You've told us this page has unclear or confusing information. Please tell us more about what you found unclear or confusing, or let us know how we could make it clearer:
You've told us there is a spelling or grammar error on this page. Please tell us what's wrong:
You've told us this page has a problem. Please tell us more about what's wrong:
Thank you for helping to make the Unity documentation better!
Your feedback has been submitted as a ticket for our documentation team to review.
We are not able to reply to every ticket submitted.