A small process-wide store for values only the screen host can observe: safe-area insets, viewport size, and keyboard height. The host publishes them as the platform reports changes, and view handlers read them on demand instead of receiving them through every measurement call. Everything here is in layout units, points on iOS and density-independent pixels on Android, so the values add directly to other layout-unit values without conversion. Most app code reaches this indirectly, through [use_safe_area_insets][pythonnative.use_safe_area_insets] and [use_window_dimensions][pythonnative.use_window_dimensions].

::: pythonnative.platform_metrics options: show_root_heading: false show_root_toc_entry: false members_order: source filters: ["!^_"]

• See the handlers that read these values in Native views.
• See the ops that position a view once it's measured in Mutation ops.
• See the other Python-side registry the native layer talks to in Events.
• Use the hooks that wrap these in Hooks.