ElevatedButton 构造方法及属性

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/// Create an ElevatedButton

const ElevatedButton({
  super.key,
  required super.onPressed,
  super.onLongPress,
  super.onHover,
  super.onFocusChange,
  super.style,
  super.focusNode,
  super.autofocus = false,
  super.clipBehavior = Clip.none,
  super.statesController,
  required super.child,
});

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/// Create an elevated button from a pair of widgets that serve as the button's
/// 图标和标签排成一行，并由12个逻辑像素填充
/// 开始是16，结尾是16，中间有8像素的间隔。



  factory ElevatedButton.icon({
    Key? key,
    required VoidCallback? onPressed,
    VoidCallback? onLongPress,
    ValueChanged<bool>? onHover,
    ValueChanged<bool>? onFocusChange,
    ButtonStyle? style,
    FocusNode? focusNode,
    bool? autofocus,
    Clip? clipBehavior,
    MaterialStatesController? statesController,
    required Widget icon,
    required Widget label,
  }) = _ElevatedButtonWithIcon;