Glass

Where

• kotlin/arkui/src/dev/arkui/Glass.kt: GlassContainer, Modifier.glass, GlassMorph, GlassShape, Glass

How

• GlassContainer(modifier, spacing = Space.s) { … }: one surface for every piece of glass in it, as SwiftUI's GlassEffectContainer. Two pieces nearer than spacing are joined by a neck that thickens as they close; a piece appearing buds out of its nearest neighbour, and one going shrinks back into it. Best as large as the screen, since a menu opens over all of it.
• Modifier.glass(shape = GlassShape.Capsule, id = null): this element on glass, a capsule or GlassShape.rounded(corner). Moved in its layout, it glides there on Springs.MOVE, its content with it. id is what the container knows it by, as glassEffectID.
• GlassMorph(expanded, onDismiss, modifier, shape, id, menuWidth = Glass.menuWidth, menuCorner = Glass.menuCorner, sheet = false, held = null, collapsed = { button }) { menu }: a button whose glass becomes its menu, its bounds and corners on one spring, the button's face fading as the menu comes in, anchored at the button's edge. A tap outside, or back, calls onDismiss. It must be in a GlassContainer.
• sheet = true opens it as iOS 26's floating sheets instead: as wide as the space less Glass.sheetMargin each side, resting on its foot that far up; give it menuCorner = Glass.sheetCorner for the iPhone's corners. Still grown out of the button, and shrunk back into it.
• held = p holds a GlassMorph at p of the way, 0 to 1, whatever expanded says: a screenshot's frame.
• The fill is the scheme's surfaceBright with a soft shadow (Glass.fill(), Glass.shadow): no blur, no refraction, no highlight yet.