Scroll to first matching train car when tapping legend icons

[guytepper]

Make the ♿ and 🚲 legend items in the train info sheet tappable.
When pressed, the horizontal ScrollView smoothly scrolls to the
first wagon that has the corresponding feature (wheelchair accessibility
or bicycle). Uses onLayout to track wagon positions for accurate scrolling.

https://claude.ai/code/session_01Ba8it32YbXZ1BxsQRnNn4S

[gemini-code-assist]

Summary of Changes

Hello @guytepper, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the user experience on the train information screen by introducing interactive legend items. Users can now tap on the wheelchair or bicycle icons in the legend to automatically scroll the train car display to the first wagon that offers the corresponding feature, improving navigation and discoverability of specific train car amenities.

Highlights

• Interactive Legend Items: Made the wheelchair (♿) and bicycle (🚲) legend icons in the train info sheet tappable.
• Smooth Scrolling: Implemented smooth horizontal scrolling to the first train car that matches the tapped legend feature (accessibility or bicycle).
• Dynamic Layout Tracking: Utilized onLayout to dynamically track and store the positions of individual train wagons for accurate scrolling.

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Changelog

• app/screens/route-details/route-details-train-info.tsx
  • Imported useCallback, Pressable, and LayoutChangeEvent for new interactive features.
  • Added an onLayout prop to the WagonItem component and applied it to its root View to capture layout information.
  • Introduced wagonLayoutsRef to store the x-coordinates of each wagon for programmatic scrolling.
  • Created scrollToWagonIndex to smoothly scroll the ScrollView to a specified wagon index.
  • Defined handleAccessibilityPress and handleBicyclePress callbacks to find and scroll to the first relevant wagon.
  • Replaced static View components for legend items with Pressable components, attaching the new press handlers for interactivity.

Activity

• The pull request was created to add interactive scrolling functionality to the train info screen.

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[gemini-code-assist]

Code Review

The pull request effectively implements the requested functionality to make the wheelchair and bicycle legend icons tappable, allowing users to smoothly scroll to the first corresponding train car. The use of useCallback, useMemo, and useRef for managing state and optimizing performance is appropriate. The logic for tracking wagon layouts and scrolling appears sound and well-integrated with the existing component structure. The changes are clean and introduce the new features without apparent issues.