getHoverColor method Null safety

Color getHoverColor(

)

The fill color of the button when it has input focus.

Returns the button's MaterialButton.focusColor if it is non-null. Otherwise the focus color depends on getTextTheme:

ButtonTextTheme.normal, ButtonTextTheme.accent, ButtonTextTheme.primary: returns the value of the focusColor constructor parameter if it is non-null, otherwise the value of getTextColor with opacity 0.04.

Implementation

Color getHoverColor(MaterialButton button) {
  return button.hoverColor ?? _hoverColor ?? getTextColor(button).withOpacity(0.04);
}