How to make a SimpleDialog with scroll in Flutter

Question

I have made a SimpleDialog to give the user the option to modify, but I have noticed that on small screens it doesn't scroll so it is cut off and cannot even be accepted. I have seen in some other questions that they put "scrolling: true" when calling showDialog but it tells me that it doesn't have this attribute. I don't know what to put on it.

child: GestureDetector(
        onDoubleTap: () {
          showDialog(
              context: context,
              builder: (context) {
                return MaterialApp(
                  debugShowCheckedModeBanner: false,
                  title: 'iOrganize',
                  theme: ThemeData.dark().copyWith(
                    scaffoldBackgroundColor: secondBgColor,
                    textTheme: GoogleFonts.poppinsTextTheme(
                            Theme.of(context).textTheme)
                        .apply(bodyColor: primaryColor),
                  ),
                  home: CustomDialogModificarTarea(usuario, tarjeta),
                );
              });
        },

The CustomDialogModificarTarea code is too long to put it here, but if necessary I'll put pictures.

class CustomDialogModificarTarea extends StatelessWidget {
  final Usuario usuario;
  final Tarjeta tarjeta;
  ProyectoService proyectoService = ProyectoServiceFirebase();
  UsuarioService usuarioService = UsuarioServiceFirebase();
  TarjetaService tarjetaService=TarjetaServiceFirebase();
  TextEditingController nombreController = TextEditingController();
  TextEditingController fechaController = TextEditingController();

  CustomDialogModificarTarea(this.usuario,this.tarjeta);

  @override
  Widget build(BuildContext context) {
    return Dialog(
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(Consts.padding),
      ),
      elevation: 0.0,
      backgroundColor: Colors.transparent,
      child: dialogContent(context),
    );
  }

  dialogContent(BuildContext context) {
    return Stack(
      children: <Widget>[
        buildCard(context),
        buildCircle(),
        //...bottom card part,
        //...top circlular image part,
      ],
    );
  }

  Widget buildCard(BuildContext context) {
    return Positioned(
      top: 50,
      left: Consts.padding,
      right: Consts.padding * 2,
      child: Container(
        decoration: new BoxDecoration(
          color: secondBgColor,
          shape: BoxShape.rectangle,
          borderRadius: BorderRadius.circular(Consts.padding),
          boxShadow: [
            BoxShadow(
              color: Color.fromARGB(66, 0, 0, 0),
              blurRadius: 10.0,
              offset: const Offset(0.0, 10.0),
            ),
          ],
        ),
        padding: const EdgeInsets.only(
          top: Consts.avatarRadius + Consts.padding,
          bottom: Consts.avatarRadius + Consts.padding,
          left: Consts.avatarRadius + Consts.padding,
          right: Consts.avatarRadius + Consts.padding,
        ),
        margin: const EdgeInsets.only(top: Consts.avatarRadius),
        child: Column(
          mainAxisSize: MainAxisSize.min, // To make the card compact
          children: <Widget>[
            const Text(
              "Modificar tarea",
              style: TextStyle(
                fontSize: 24.0,
                fontWeight: FontWeight.w700,
              ),
            ),
            const SizedBox(height: 16.0),
            TextFormField(
              controller: nombreController,
              decoration: const InputDecoration(
                hintText: 'Cambiar el nombre de la tarea',
              ),
            ),
            TextFormField(
              controller: fechaController,
              decoration: const InputDecoration(
                hintText: 'Cambiar la fecha de la tarea',
              ),
            ),
            const SizedBox(height: 16.0),
            Align(
              alignment: Alignment.bottomLeft,
              child: TextButton(
                onPressed: () {
                  Navigator.of(context).pop();
                },
                child: const Text('Cancelar'),
              ),
            ),
            Align(
              alignment: Alignment.bottomCenter,
              child: TextButton(
                onPressed: () {
                  
                  TablaService tablaService=TablaServiceFirebase();
                  int pos;
                  pos=int.tryParse(usuario.idProyectoActual)!;
                  TarjetaService tarjetaService=TarjetaServiceFirebase();
                  print("Borrar Tarjetas");
                  for(int i=0;i<2;i++){
                    List<Tarjeta>? tarjetas=usuario.proyectos![pos].tablas![i].tarjetas;
                    print(tarjetas!.length);
                    bool borrado=false;
                    for(int j=0; tarjetas!=null && j<tarjetas.length && !borrado;j++){
                      print("Segundo for");
                      if(tarjetas[j].id==tarjeta.id){
                        print("La he encontrado $i ${tarjetas[j].id}");
                        tarjetas.removeAt(j);
                         usuario.proyectos![pos].tablas![i].tarjetas=tarjetas;
                         print(usuario.proyectos![pos].tablas![i].tarjetas!.length);
                        borrado=true;
                      }
                    }
                    print("Imprimo el id: ${usuario.proyectos![pos].tablas![i].id!.split("-")[1] }");
                     tablaService.updateTabla(id: usuario.proyectos![pos].tablas![i].id!.split("-")[1], tipo: usuario.proyectos![pos].tablas![i].id!.split("-")[0], t: usuario.proyectos![pos].tablas![i]);
                  }
                  print("Salgo ta");
                  tarjetaService.deleteTarjeta(id: tarjeta.id);
                 

                  Navigator.of(context).pop();
                },
                child: const Text('Borrar tarea'),
              ),
            ),
            Align(
              alignment: Alignment.bottomRight,
              child: TextButton(
                onPressed: () async {
                  
                  if(nombreController.text!=""){
                    tarjeta.name=nombreController.text;
                  }
                  if(fechaController.text!=""){
                    tarjeta.fecha=fechaController.text;
                  }
                  
                  tarjetaService.updateTarjeta(tarjeta: tarjeta);
                  Navigator.of(context).pop();
                },
                child: const Text('Modificar'),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget buildCircle() {
    return const Positioned(
      right: 16,
      top: 50,
      child: const CircleAvatar(
        backgroundColor: Colors.blueAccent,
        radius: Consts.avatarRadius,
      ),
    );
  }
}

class Consts {
  Consts._();

  static const double padding = 16.0;
  static const double avatarRadius = 16.0;
}

rbc 99 · Accepted Answer · 2022-12-06 13:51:06Z

1

This should work:

Widget buildCard(BuildContext context) {
 return Scrollbar(
  controller: _controllerOne,
  thumbVisibility: true,
  child: GridView.builder(
    controller: _controllerOne,
    itemCount: 1,
    gridDelegate:
        const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 1),
    itemBuilder: (BuildContext context, int index) {
      return buildCard2(context)//Call your buildCard(buildCard2)
    },
  ),
);

}

You should change the name of your build(ex:buildCar2) so that this method is the one that is executed first.

answered Dec 6, 2022 at 13:51

rbc 99

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Comments

Munsif Ali · Accepted Answer · 2022-12-05 10:41:35Z

0

AlertDialog has scrollable property instead of returning MaterialApp return AlertDialog that will solve your problem

showDialog(
        context: context,
         builder: (context) {
         return AlertDialog(
         scrollable: true,
         title: 'iOrganize',
           content: //write your main content here
           );
     });

edited Dec 5, 2022 at 10:41

answered Dec 5, 2022 at 10:33

Munsif Ali

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2 Comments

Tatiana Sánchez Over a year ago

It gives me this error: Error: Cannot hit test a render box with no size. The hitTest() method was called on this RenderBox: RenderConstrainedBox#42253 relayoutBoundary=up1: needs compositing creator: ConstrainedBox ← Align ← MediaQuery ← Padding ← AnimatedPadding ← Dialog ← AlertDialog ← Builder ← DefaultTextStyle ← IconTheme ← IconTheme ← IconTheme ← ⋯ parentData: offset=Offset(0.0, 0.0) (can use size) constraints: BoxConstraints(0.0<=w<=1286.0, 0.0<=h<=609.0) size: MISSING additionalConstraints: BoxConstraints(280.0<=w<=Infinity, 0.0<=h<=Infinity)

Tatiana Sánchez Over a year ago

Although this node is not marked as needing layout, its size is not set. A RenderBox object must have an explicit size before it can be hit-tested. Make sure that the RenderBox inquestion sets its size during layout.

Shahood ul Hassan · Accepted Answer · 2022-12-05 12:58:55Z

0

Firstly, instead of returning a MaterialApp, you should return an AlertDialog from the builder of showDialog. Secondly, wrap your content inside a SingleChildScrollView widget if you believe that the content is too large to fit into one screen. That's the advisable solution as per the documentation:

If the content is too large to fit on the screen vertically, the dialog will display the title and the actions and let the content overflow, which is rarely desired. Consider using a scrolling widget for content, such as SingleChildScrollView, to avoid overflow

Here's the revised code. Hope it helps!

child: GestureDetector(
        onDoubleTap: () {
          showDialog(
              context: context,
              builder: (context) {
                return AlertDialog(
                  title: const Text('iOrganize'),
                  content: SingleChildScrollView(
                    child: CustomDialogModificarTarea(usuario, tarjeta),
                  )
                );
              });
         },

answered Dec 5, 2022 at 12:58

Shahood ul Hassan

7992 gold badges9 silver badges22 bronze badges

4 Comments

Tatiana Sánchez Over a year ago

It gives me this error: Error: Cannot hit test a render box with no size. The hitTest() method was called on this RenderBox: RenderConstrainedBox#42253 relayoutBoundary=up1: needs compositing creator: ConstrainedBox ← Align ← MediaQuery ← Padding ← AnimatedPadding ← Dialog ← AlertDialog ← Builder ← DefaultTextStyle ← IconTheme ← IconTheme ← IconTheme ← ⋯ parentData: offset=Offset(0.0, 0.0) (can use size) constraints: BoxConstraints(0.0<=w<=1286.0, 0.0<=h<=609.0) size: MISSING additionalConstraints: BoxConstraints(280.0<=w<=Infinity, 0.0<=h<=Infinity)

Tatiana Sánchez Over a year ago

Although this node is not marked as needing layout, its size is not set. A RenderBox object must have an explicit size before it can be hit-tested. Make sure that the RenderBox inquestion sets its size during layout.

Shahood ul Hassan Over a year ago

You might wanna share the code of CustomDialogModificarTarea widget.

Tatiana Sánchez Over a year ago

I already update the code.

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