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how to pass widget as default parameter in dart flutter?

I am creating a full screen loader where i want to set default circularprogressindicator if user dont pass any widget to this function..

but its showing error

whats my mistake

static void showFullScreenDialog({Widget widget=Text('hello')//showing an error} ){
    showDialog(
        context: Get.overlayContext!,
        barrierDismissible: false,
        builder: (_) => PopScope(
            canPop: false,
            child: Container(
          height: double.infinity,
          width: double.infinity,
          color: Colors.transparent,
          child: Center(child: widget,),
        )),
        );
  }
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2

Answers


  1. 0

    You haven’t shared the error message, but I can guess the source of the problem. When creating a widget as a default value in function parameters, this widget needs to be created at build time. However, Text('hello') is created at runtime.

    static void showFullScreenDialog({
  Widget Function()? widgetBuilder,
}) {
  showDialog(
    context: Get.overlayContext!,
    barrierDismissible: false,
    builder: (_) => PopScope(
      canPop: false,
      child: Container(
        height: double.infinity,
        width: double.infinity,
        color: Colors.transparent,
        child: Center(
          // Use widgetBuilder if provided, otherwise show default CircularProgressIndicator
          child: widgetBuilder != null
              ? widgetBuilder()
              : const CircularProgressIndicator(),
        ),
      ),
    ),
  );
}
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  2. 0

    call this function as below

    className.showFullScreenDialog()// willshow circularProgressIndicator

or

className.showFullScreenDialog(loader:Text('hello))// will show Text('hello')


    static void showFullScreenDialog({Widget? loader}) {
    showDialog(
      context: Get.overlayContext!,
      barrierDismissible: false,
      builder: (_) => PopScope(
        canPop: false,
        child: Container(
          height: double.infinity,
          width: double.infinity,
          color: Colors.transparent,
          child: Center(
            child: loader != null ? loader : CircularProgressIndicator(),//add this line
          ),
        ),
      ),
    );
  }
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