Bringing Modern UI Architecture to Garmin Apps: The Sweet Spot Between Performance and Testability
TL;DR Attempted to introduce modern UI architecture (unidirectional data flow and component separation) to Garmin app development, an environment severely constrained by kilobytes of RAM and a weak CPU. Built a custom Hooks-like library for the Monkey C environment, but calling it directly inside the render loop caused excessive CPU load. Adopted a "Props Packing Pattern" (passing arrays) and the…
The article discusses the challenges of developing rich user interfaces for Garmin smartwatch apps while working within severe memory and processing limitations. It details how the author attempted to introduce modern UI architecture principles like unidirectional data flow and component separation to Garmin's Monkey C environment.
However, calling modern library components directly in the render loop caused excessive CPU load. To solve this, the author adopted a Props Packing Pattern (passing arrays of props) and a Container/Presenter Pattern. This allowed the app to achieve a negligible 0.8ms per-frame overhead while enabling headless UI integration tests and benchmarks without an emulator, significantly improving the developer experience.
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