hive_input_dialog_add.dart

inputItemDialog(BuildContext context, String action, [int index]) {
    var inventoryDb = Provider.of<HomeModel>(context, listen: false);

    showDialog(
      context: context,
      builder: (context) {
        return Dialog(
          child: Container(
            padding: EdgeInsets.only(
              left: 15,
              right: 15,
              top: 40,
            ),
            height: 45.height,
            child: SingleChildScrollView(
              child: Form(
                key: _formKey,
                child: Column(
                  children: <Widget>[
                    Text(
                      action == 'add' ? 'Add Item' : 'Update Item',
                      style: TextStyle(
                        fontWeight: FontWeight.bold,
                        fontSize: 20,
                      ),
                    ),
                    SizedBox(
                      height: 10,
                    ),
                    TextFormField(
                      controller: nameController,
                      validator: (value) {
                        if (value.isEmpty) {
                          return 'Item name cannot be empty';
                        }
                        return null;
                      },
                      decoration: InputDecoration(
                        labelText: 'Item name',
                      ),
                    ),
                    SizedBox(
                      height: 40,
                    ),
                    TextFormField(
                      controller: descriptionController,
                      validator: (value) {
                        if (value.isEmpty) {
                          return 'Item description cannot be empty';
                        }
                        return null;
                      },
                      decoration: InputDecoration(
                        labelText: 'Item description',
                      ),
                    ),
                    SizedBox(
                      height: 40,
                    ),
                    RaisedButton(
                      onPressed: () async {
                        if (_formKey.currentState.validate()) {
                          if (action == 'add') {
                            await inventoryDb.addItem(Inventory(
                              name: nameController.text,
                              description: descriptionController.text,
                            ));
                          } else {
                            
                          }

                          nameController.clear();
                          descriptionController.clear();

                          inventoryDb.getInventory();

                          Navigator.pop(context);
                        }
                      },
                      color: Colors.green[600],
                      child: Text(
                        action == 'add' ? 'Add' : 'update',
                        style: TextStyle(
                          fontSize: 16,
                          color: Colors.white,
                        ),
                      ),
                    ),
                    SizedBox(
                      height: 20,
                    )
                  ],
                ),
              ),
            ),
          ),
        );
      },
    );
  }