nitro_fold_duo 0.0.1

iPhone Duo support for Flutter backed by UIKit's reserved-region, hinge and vertical-bar APIs over Nitro FFI, with fold-aware layout and Liquid Glass chrome.

0.0.1

Initial release: iPhone Duo support, over a Nitro FFI bridge with no method channels.

Geometry and hinge

• duoState and the derived duoActiveDivision, duoActiveOcclusions, duoHingeStatus, duoVerticalBarEdge and duoCornerInsets signals report the fold, the cameras, the hinge and the corner clearance, and rebuild a widget when the device folds, rotates or changes display.
• DuoSplit places two panes either side of an active fold, DuoOcclusionSafeArea keeps content clear of a camera, and DuoLayout exposes the same decisions as pure functions for custom layouts.
• DuoDisplayFeatures publishes the fold through MediaQuery.displayFeatures, which dart:ui only fills in on Android — so dialogs, popups and routes that already avoid a hinge on a Fold behave the same on iPhone Duo.

The vertical bar

• DuoBarScaffold keeps the body clear of the strip the system reserves and draws the bar in it, falling back to your own horizontal chrome where the system keeps bars horizontal.
• DuoVerticalBar lays the strip out the way the system does: status clearance, back control, toolbar groups and the tab bar, each group one real UIGlassEffect capsule, with anything that does not fit behind a UIMenu.
• DuoBarStyle and DuoBarTheme carry the measurements and tint; DuoBarStyle.compression mirrors UIVerticalBarCompressionBehavior.
• DuoGlassSurface is the same material without the buttons, for chrome that content scrolls under.

Platforms

• iOS 27.1 for the reserved-region, hinge and vertical-bar APIs; older systems report isSupported == false.
• Android reports the fold through Jetpack WindowManager and the hinge angle through the hinge sensor.
• macOS, Windows and Linux answer the whole API as "no Duo" and ignore the bar calls, so an app can call it without a platform check.