Drawer Hack

can we assign the hidden attribute to the state and create a function to toggle between hidden = true and hidden = false , to hide the webview rect when the drawer is opened
and we use the leading in Appbar to control that

State and function to toggle visibility
`
bool _visibility = false;
_handleDrawer(){
_scaffoldKey.currentState.openDrawer();
setState(() {
_visibility = true;
});
}
`

` appBar: new AppBar(
centerTitle: true,
leading: new IconButton(icon: new Icon(
Icons.menu
),onPressed:_handleDrawer,),
title: new Text('Plugin example app'),
),
`
so when the drawer is opened the state of the webview hidden is true , and when drawer is closed hidden is false

I am a beginner and i cant make the toggle function to work