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SwiftUICompatibilityGaps.md

SwiftUICompatibilityGaps.md 2.5 KB
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SwiftUI Compatibility Gaps

This document tracks large SwiftUI feature areas that are not yet supported, or are only partially supported, by OpenSwiftUI. It is intentionally broad: use it as a contributor-facing map, not as an API-by-API compatibility matrix.

Last updated: 2026-05-18.

Major Unsupported Areas

Area Current state What is still missing
Text layout and rendering Partial Basic Text structure exists, but SwiftUI-compatible measurement, line breaking, truncation, baseline handling, rich attributes, attachments, and renderer integration are still incomplete.
Text localization and formatted text Partial LocalizedStringKey / localized Text support is mostly placeholder-level. Bundle/table/locale lookup, interpolation, FormatStyle, date/timer text, and formatter-backed text need more work.
Complex Path and shape geometry Partial Simple path construction exists, but advanced Path behavior is incomplete, including robust CoreGraphics bridging, iteration, containment, trimming, stroked paths, rounded-rect variants, and platform parity for path storage.
Gradient and shape style system Partial Gradient data types exist, but full SwiftUI-style gradient resolution, color-space handling, rendering, animation behavior, and integration with ShapeStyle / display-list rendering are not complete.
Gesture system Partial Gesture types and modifiers are present, but the gesture graph, event routing, platform recognizer bridge, hit testing, gesture state propagation, and composed gestures are still largely unfinished.

Adjacent Gaps

These areas are closely tied to the major gaps above and may need to move together:

  • Font resolution, font modifiers, dynamic type, and platform font bridging.
  • Text accessibility attributes and attributed-string export/import.
  • Shape layer and mask rendering for filled, stroked, clipped, and styled paths.
  • Material, tint, foreground/background style resolution, and multicolor style rendering.
  • Gesture debug support and compatibility tests for user interaction behavior.

Source Areas

The relevant implementation is mostly under:

  • Sources/OpenSwiftUICore/View/Text
  • Sources/OpenSwiftUICore/Shape
  • Sources/OpenSwiftUICore/Graphic/Gradient
  • Sources/OpenSwiftUICore/Shape/ShapeStyle
  • Sources/OpenSwiftUICore/Event/Gesture

When a major area becomes usable, update this document with a short note and add focused compatibility tests near the implementation.