GFDrawer constructor
      const
      GFDrawer({ 
    
- Key? key,
- double elevation = 16.0,
- Widget? child,
- String? semanticLabel,
- ImageProvider<Object> ? backgroundImage,
- ColorFilter? colorFilter,
- Gradient? gradient,
- Color? color,
Creates a material design drawer.
Typically used in the Scaffold.drawer property.
The elevation must be non-negative.
Implementation
const GFDrawer({
  Key? key,
  this.elevation = 16.0,
  this.child,
  this.semanticLabel,
  this.backgroundImage,
  this.colorFilter,
  this.gradient,
  this.color,
})  : assert(elevation >= 0.0),
      super(key: key);