drawerThemeData method
Implementation
DrawerThemeData drawerThemeData(Palette colors) {
return DrawerThemeData(
backgroundColor: colors.backgroundText,
scrimColor: Colors.black.withOpacityNeue(0.54),
shadowColor: _singleShadowColorFor(colors.background),
surfaceTintColor: colors.background,
shape: null,
endShape: null,
width: null /* use default value of Drawer.width */,
);
}