GlassContextMenu class

A liquid glass context menu following Apple iOS 26/27 and SwiftUI .contextMenu() design.

When long-pressed or secondary-tapped (right-clicked on desktop/web), the wrapped child lifts above a defocused liquid glass backdrop with realistic elevation shadow, while an adjacent liquid glass action platter springs open with snappy spring physics.

Features

• Touch-and-Hold Surface Lift: When pressed and held, the row lifts off the page (about 1.036×) with a broad soft drop shadow, keeping its own corner shape.
• Row-to-Preview Morph: On commit the lifted row cross-dissolves and morphs into the centred preview card in ~190ms while the page dims, and morphs back into the row on dismiss.
• Haptic Surface Lift: Fires HapticFeedback.mediumImpact() as the menu commits.
• Native Backdrop: A plain dimming scrim (no blur by default), matching iOS.
• Elevated Specular Platter: The action list renders in a rounded superellipse liquid glass container with specular highlights.
• Smart Positioning: Automatically opens below or above the target based on available screen space and clamps safely within screen edges.
• Continuous Glide-to-Select: Dragging from the long-press directly across menu items highlights the hovered action with haptic ticks; releasing selects the action.
• Custom Preview Support: Supply previewBuilder to render custom content when lifted.
• Secondary Tap Parity: Right-click on desktop/macOS opens the menu immediately.

Usage

GlassContextMenu(
  actions: [
    GlassContextMenuAction(
      icon: const Icon(CupertinoIcons.share),
      child: const Text('Share Contact'),
      onPressed: () => shareContact(),
    ),
    GlassContextMenuAction(
      icon: const Icon(CupertinoIcons.delete),
      isDestructive: true,
      child: const Text('Delete'),
      onPressed: () => deleteContact(),
    ),
  ],
  child: ContactCard(contact: contact),
)