update method

@override (Model, Cmd?) update(Msg msg)

Handles messages by forwarding to children then calling handleUpdate.

Automatically updates theme state when terminal background is detected. Do not override this method. Override handleUpdate instead.

Implementation

@override
(Model, Cmd?) update(Msg msg) {
  final cmds = <Cmd>[];
  final current = this;

  // Auto-detect terminal background and update theme state
  if (msg is BackgroundColorMsg) {
    updateThemeFromBackground(msg.hex);
  }

  // Forward to all children
  for (final child in current.children) {
    final (_, cmd) = child.update(msg);
    if (cmd != null) cmds.add(cmd);
  }

  // Handle own messages
  final (newWidget, cmd) = current.handleUpdate(msg);
  if (cmd != null) cmds.add(cmd);

  return (newWidget, cmds.isEmpty ? null : Cmd.batch(cmds));
}