main-form.dart

var _formKey = GlobalKey<FormState>();

child: Form(
            key: _formKey,
            child: Column(
              children: <Widget>[
                DynamicInput(
                  hint: 'Enter valid name',
                  controller: nameController,
                  label: 'Name',
                  type: DataType.NAME,
                ),
                DynamicInput(
                  hint: 'Enter valid email',
                  controller: emailController,
                  label: 'Email',
                  type: DataType.EMAIL,
                ),
                DynamicInput(
                  hint: 'Enter valid age',
                  controller: ageController,
                  label: 'Age:',
                  type: DataType.INTEGER,
                ),
                DynamicInput(
                  hint: 'Enter valid phone',
                  controller: phoneController,
                  label: 'Phone',
                  type: DataType.PHONE,
                ),
                RaisedButton(
                  child: Text('Validate'),
                  color: valid ? Colors.green : Colors.red,
                  onPressed: () {
                    if (_formKey.currentState.validate()) { ///validates the form
                      setState(() {
                        valid = true;
                      });
                      print('Entire form is valid');
                    } else {
                      print('Some info is not correct');
                    }
                  },
                )
              ],
            ),
          ),