setTheme method

void setTheme(
  1. NodeFlowTheme theme
)

Set the theme and update the connection painter.

This is called internally by the editor widget only.

Parameters:

  • theme: The theme to apply to the graph editor

Implementation

void setTheme(NodeFlowTheme theme) {
  final isFirstTimeSetup = _connectionPainter == null;

  // Create painter if it doesn't exist, otherwise update its theme
  if (isFirstTimeSetup) {
    _connectionPainter = ConnectionPainter(
      theme: theme,
      // Cast to Node<dynamic> since ConnectionPainter is not generic
      nodeShape: _nodeShapeBuilder != null
          ? (node) => _nodeShapeBuilder!(node as Node<T>)
          : null,
    );
  } else {
    _connectionPainter!.updateTheme(theme);
  }

  // Update observable theme - this triggers the reaction for spatial index rebuild
  runInAction(() => _themeObservable.value = theme);

  // If this is the first time setup and we have pre-loaded nodes from
  // the constructor, set up the infrastructure now that we have a theme
  if (isFirstTimeSetup && _nodes.isNotEmpty) {
    _setupLoadedGraphInfrastructure();
  }
}