build method

@override Widget build(BuildContext context)

Describes the part of the UI represented by this widget.

Implementation

@override
Widget build(BuildContext context) {
  if (!open) return child;

  // Dim the background content so the dialog stands out.
  // In a terminal we cannot do true alpha blending, so Opacity applies
  // Style().dim() to the child content, letting it remain visible but
  // visually receded behind the dialog.
  final dimmedChild = backdropOpacity < 1.0 && backdropOpacity > 0.0
      ? Opacity(opacity: backdropOpacity, child: child)
      : child;

  // Prevent pointer/scroll events from leaking to background content while
  // a modal is open. The dismiss layer and dialog remain interactive.
  final blockedBackground = _ModalInputBlocker(
    child: IgnorePointer(ignoring: true, child: dimmedChild),
  );

  // Transparent dismiss layer — sized to fill the stack but paints nothing,
  // so the dimmed child shows through.
  final dismissLayer = dismissible
      ? GestureDetector(onTap: () => onDismiss?.call(), child: Container())
      : Container();

  return Stack(
    fit: StackFit.expand,
    alignment: Alignment.center,
    children: [
      blockedBackground,
      dismissLayer,
      Center(child: FocusScope(isTrapped: true, child: dialog)),
    ],
  );
}