getFocusColor method

Color getFocusColor(

)

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: returns the value of the focusColor constructor parameter if it is non-null, otherwise the value of getTextColor with opacity 0.12.
ButtonTextTheme.primary, returns Colors.transparent.

Implementation

Color getFocusColor(MaterialButton button) {
  return button.focusColor ?? _focusColor ?? getTextColor(button).withOpacity(0.12);
}