MousePopupButton<T>  constructor 
      const
      MousePopupButton<T> ({ 
    
    
- Widget? child,
- PopupMenuItemBuilder<T> ? itemBuilder,
- PopupMenuCanceled? onCanceled,
- PopupMenuItemSelected<T> ? onSelected,
- T? initialValue,
- double? elevation,
- String? semanticLabel,
- ShapeBorder? shape,
- Color? color,
- BoxConstraints? constraints,
- Key? key,
Implementation
const MousePopupButton(
    {this.child,
    this.itemBuilder,
    this.onCanceled,
    this.onSelected,
    this.initialValue,
    this.elevation,
    this.semanticLabel,
    this.shape,
    this.color,
    this.useRootNavigator = false,
    this.constraints,
    Key? key})
    : super(key: key);