feat: implement Thread viewport with radix-ui scroll-area primitives

[PieterT2000]

Addresses #1125

---

[!IMPORTANT] Implement Thread viewport using Radix UI scroll-area primitives, adding new components and updating existing ones.

• Components:
  • Implement ScrollArea and ScrollBar components in scroll-area.tsx using @radix-ui/react-scroll-area.
  • Update ThreadPrimitiveRoot in ThreadRoot.tsx to use ScrollAreaPrimitive.Root and include ScrollBar.
  • Update ThreadPrimitiveViewport in ThreadViewport.tsx to use ScrollAreaPrimitive.Viewport.
• Dependencies:
  • Add @radix-ui/react-scroll-area version 1.2.1 to package.json in both apps/registry and packages/react.
• Misc:
  • Remove Scrollbar.mdx documentation file.

^{This description was created by for 448efd6906a824c59abbf00c9d0c7313a26c1131. It will automatically update as commits are pushed.}

[vercel[bot]]

@PieterT2000 is attempting to deploy a commit to the assistant-ui Team on Vercel.

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[entelligence-ai-pr-reviews[bot]]

LGTM :+1:

[promptless[bot]]

📝 Documentation updates detected! You can review documentation updates here

                        Promptless's comment below: 

The PR implements a significant change to the Thread component's scrollbar functionality, making it a built-in feature using Radix UI's scroll-area primitives. I've made the following documentation updates:

1. Updated the Thread.mdx documentation to reflect that the Root component now uses Radix UI's ScrollArea.Root by default
2. Updated the Viewport component documentation to indicate it uses ScrollArea.Viewport
3. Added information about the built-in custom scrollbar functionality
4. Fixed a typo in "Contains" (was "Containts")

The old Scrollbar.mdx documentation file has been removed as part of the PR since the functionality is now built into the core components. No additional documentation updates are needed since the feature is now handled automatically by the Thread component.

Let me summarize the changes for the user.

I've updated the documentation to reflect the new built-in scrollbar functionality in the Thread component. The main changes are:

1. Updated the Thread primitive documentation to show that it now includes built-in custom scrollbar functionality using Radix UI's scroll-area primitives.
2. Removed the separate Scrollbar.mdx documentation since this functionality is now built into the core Thread component.
3. Updated the component descriptions to reflect that Root and Viewport components now use Radix UI's ScrollArea components by default.

These changes align with the PR's implementation of Thread viewport with Radix UI scroll-area primitives, making the custom scrollbar functionality a built-in feature rather than requiring manual setup.

[coderabbitai[bot]]

Walkthrough

The pull request removes the documentation file for implementing a custom scrollbar and introduces new scroll area components. A new file is added that defines ScrollArea and ScrollBar components using primitives from the @radix-ui/react-scroll-area library. The ThreadRoot and ThreadViewport components are updated to replace previous div implementations with these scroll area primitives, with corresponding updates to type definitions. In addition, a new ScrollBar component is added to another part of the codebase to manage scrollbar styling and functionality. The dependency on @radix-ui/react-scroll-area is updated in multiple package.json files to version 1.2.1, and the registry of components now includes an entry for "scroll-area". No changes were made to declarations of exported or public entities apart from the necessary updates to component references and type definitions.

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apps/registry/components/ui/scroll-area.tsx

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ESLint: 9.20.0

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packages/react/src/primitives/thread/ThreadViewport.tsx

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ESLint: 9.20.0

ESLint couldn't find an eslint.config.(js|mjs|cjs) file.

From ESLint v9.0.0, the default configuration file is now eslint.config.js. If you are using a .eslintrc.* file, please follow the migration guide to update your configuration file to the new format:

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apps/registry/src/registry.ts

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ESLint: 9.20.0

ESLint couldn't find an eslint.config.(js|mjs|cjs) file.

From ESLint v9.0.0, the default configuration file is now eslint.config.js. If you are using a .eslintrc.* file, please follow the migration guide to update your configuration file to the new format:

https://eslint.org/docs/latest/use/configure/migration-guide

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• 2 others

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[trag-bot[bot]]

@trag-bot didn't find any issues in the code! ✅✨

[trag-bot[bot]]

Pull request summary

• Added documentation for integrating a custom scrollbar using @radix-ui/react-scroll-area.
• Updated the registry to include the new scroll-area dependency.
• Specified the @radix-ui/react-scroll-area version in the package.json file.
• Modified ThreadPrimitiveRoot to use ScrollAreaPrimitive.Root instead of a primitive div.
• Updated ThreadPrimitiveViewport to utilize ScrollAreaPrimitive.Viewport for better scroll handling.
• Created a new ScrollBar component that wraps ScrollAreaPrimitive.ScrollAreaScrollbar.
• Adjusted CSS styles for the custom scrollbar to ensure proper layout and appearance.
• Updated the lock file to reflect the new dependencies and versions.
• Ensured compatibility with existing components by maintaining the structure of Thread.Root and Thread.Viewport.
• Enhanced the overall integration of the scrollbar component within the existing UI framework.

[Yonom]

Thank you so much, this is an amazing contribution - I need to do some testing on this before releasing it - will get back to you around Monday!

[PieterT2000]

Thanks! By the way, there don't seem to be any unit/integration tests yet. Is that a decision due to the library's rapidly evolving nature, or is it still being considered? The library is still <1.0.0, so users should expect things to break, but I would be happy to contribute in that area anyway.

[maxcodefaster]

@Yonom any updates on when this will be merged? Or is this already implemented with this: https://www.assistant-ui.com/docs/ui/Scrollbar

[AVGVSTVS96]

@PieterT2000 sorry for the delay! we are looking to merge this soon, can you update and resolve conflicts? thanks for your contribution!

[PieterT2000]

Sure, no problem!

[Yonom]

We are going to revamp the scroll behavior in an upcoming release. Closing this issue for now