GFDropdown

[Not996NotOT]

The following _TypeError was thrown building GFDropdown(dirty, state:
_GFDropdownState#682b8):
type '(String?) => void' is not a subtype of type '((dynamic) => void)?'

[true-glassy]

I did have the same error

[atul-vashisht]

hi @Not996NotOT
Can you please show the more code as this looks more about the state issue, also tell me the flutter version and getwidget version you are using.
Thank you.

[atul-vashisht]

The following _TypeError was thrown building GFDropdown(dirty, state: _GFDropdownState#682b8): type '(String?) => void' is not a subtype of type '((dynamic) => void)?'

hi @Not996NotOT ,
I have identified the issue please wait.

[atul-vashisht]

Hi @Not996NotOT @true-glassy
We have fixed the issue, for now you can use

[PremchandGat]

I also got same error can u please update on pub.dev

[atul-vashisht]

@PremchandGat
Thank you for update, we will do it in the next version.

[lukehutch]

The solution is to change

class GFDropdown<T> extends StatefulWidget {
  // ...
  _GFDropdownState createState() => _GFDropdownState();
}

class _GFDropdownState extends State<GFDropdown> {
  // ...
}

to

class GFDropdown<T> extends StatefulWidget {
   // ...
  State<GFDropdown<T>> createState() => _GFDropdownState();   // Specify type parameter
}

class _GFDropdownState<T> extends State<GFDropdown<T>> {   // Specify type parameter twice
  // ...
}

[bahadirarslan]

I have the same problem, it looks like <T> wasn't passed to DropdownButton so it was expecting dynamic.
Yet i couldn't try but I think if <T> passed the DropdownButton it will be ok.

//...
 State<GFDropdown<T>> createState() => _GFDropdownState();  
//...
class _GFDropdownState<T> extends State<GFDropdown<T>> {
  @override
  Widget build(BuildContext context) => Material(
        color: widget.dropdownButtonColor,
        shape: RoundedRectangleBorder(
          side: widget.border,
          borderRadius: widget.borderRadius,
        ),
        child: Container(
          height: widget.itemHeight,
          padding: widget.padding,
          child: DropdownButton<T>( 
            items: widget.items,
            selectedItemBuilder: widget.selectedItemBuilder,
            value: widget.value,
            hint: widget.hint,
            disabledHint: widget.disabledHint,
            onChanged: widget.onChanged,
            onTap: widget.onTap,
            elevation: widget.elevation,
            style: widget.style,
            icon: widget.icon,
            iconDisabledColor: widget.iconDisabledColor,
            iconEnabledColor: widget.iconEnabledColor,
            iconSize: widget.iconSize,
            isDense: widget.isDense,
            isExpanded: widget.isExpanded,
            // itemHeight: widget.itemHeight,
            focusColor: widget.focusColor,
            focusNode: widget.focusNode,
            autofocus: widget.autofocus,
            dropdownColor: widget.dropdownColor,
          ),
        ),
      );
}

Until this will be fixed you can use GFDropdown with dynamic generic like GFDropdown<dynamic> in your widget tree.

[sarithavarrier]

please use latest version,we have resolved the issue