xamarin.forms form example

FormRepository.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Realms;
using StubbsTest.Models;

namespace StubbsTest.Data
{
    public class FormRepository : IDisposable
    {
        private Realm _realm;
        private Realm Realm => _realm ?? (_realm = Realm.GetInstance());

        public List<FormModel> GetAll()
        {
            return Realm.All<FormModel>().ToList();
        }

        public void Save(FormModel formModel)
        {
            Realm.Write(() =>
            {
                Realm.Add(new FormModel
                {
                    FirstName = formModel.FirstName,
                    LastName = formModel.LastName
                });
            });
        }

        public void Dispose()
        {
            _realm.Dispose();
        }
    }
}

FormView.cs

using Xamarin.Forms;

namespace StubbsTest.Views
{
    public class FormView : ContentPage
    {
        private static readonly Entry FirstNameEntry = new Entry();
        private static readonly Entry LastNameEntry = new Entry();

        public FormView()
        {
            BackgroundImage = "bg.jpg";

            var grid = new Grid();
            grid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
            grid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            grid.Children.Add(new Label { Text = "First Name" }, 0, 0);
            grid.Children.Add(new Label { Text = "Last Name" }, 0, 1);
            grid.Children.Add(FirstNameEntry, 1, 0);
            grid.Children.Add(LastNameEntry, 1, 1);

            var submitButton = new Button { Text = "Submit" };
            submitButton.Clicked += async (sender, args) =>
            {
                await DisplayAlert("Submitted", $"Thanks {FirstNameEntry.Text} {LastNameEntry.Text}!", "Close");
            };

            Content = new AbsoluteLayout
            {
                Children =
                {
                    new StackLayout
                    {
                        VerticalOptions = LayoutOptions.Center,
                        HorizontalOptions = LayoutOptions.FillAndExpand,
                        Children =
                        {
                            grid,
                            submitButton
                        }
                    }
                }
            };
        }
    }
}

FormView2.cs

using Xamarin.Forms;

namespace StubbsTest.Views
{
    public class FormView : ContentPage
    {
        private Entry _firstNameEntry;
        private Entry _lastNameEntry;
        private Grid _formGrid;
        private Button _submitButton;

        private Entry FirstNameEntry
        {
            get
            {
                if (_firstNameEntry != null)
                {
                    return _firstNameEntry;
                }

                return _firstNameEntry = new Entry();
            }
        }

        private Entry LastNameEntry
        {
            get
            {
                if (_lastNameEntry != null)
                {
                    return _lastNameEntry;
                }

                return _lastNameEntry = new Entry();
            }
        }

        private Grid FormGrid
        {
            get
            {
                if (_formGrid != null)
                {
                    return _formGrid;
                }

                var grid = new Grid();
                grid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
                grid.RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
                grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
                grid.ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
                grid.Children.Add(new Label { Text = "First Name" }, 0, 0);
                grid.Children.Add(new Label { Text = "Last Name" }, 0, 1);
                grid.Children.Add(FirstNameEntry, 1, 0);
                grid.Children.Add(LastNameEntry, 1, 1);

                return _formGrid = grid;
            }
        }


        private Button SubmitButton
        {
            get
            {
                if (_submitButton != null)
                {
                    return _submitButton;
                }

                var submitButton = new Button { Text = "Submit" };

                submitButton.Clicked += async (sender, args) =>
                {
                    await DisplayAlert("Submitted", $"Thanks {FirstNameEntry.Text} {LastNameEntry.Text}!", "Close");
                };

                return _submitButton = submitButton;
            }
        }

        public FormView()
        {
            BackgroundImage = "bg.jpg";

            Content = new StackLayout
            {
                VerticalOptions = LayoutOptions.Center,
                HorizontalOptions = LayoutOptions.FillAndExpand,
                Children =
                {
                    FormGrid,
                    SubmitButton
                }
            };
        }
    }
}

FormView3.cs

using StubbsTest.ViewComponents;
using Xamarin.Forms;

namespace StubbsTest.Models
{
    public class FormModel
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }
}


namespace StubbsTest.ViewComponents
{
    public class FormComponent : Grid
    {
        private Entry _firstNameEntry;
        private Entry _lastNameEntry;

        private Entry FirstNameEntry => _firstNameEntry ?? (_firstNameEntry = new Entry());
        private Entry LastNameEntry => _lastNameEntry ?? (_lastNameEntry = new Entry());

        public FormComponent()
        {
            RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
            RowDefinitions.Add(new RowDefinition { Height = new GridLength(1, GridUnitType.Star) });
            ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            ColumnDefinitions.Add(new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) });
            Children.Add(new Label { Text = "First Name" }, 0, 0);
            Children.Add(new Label { Text = "Last Name" }, 0, 1);
            Children.Add(FirstNameEntry, 1, 0);
            Children.Add(LastNameEntry, 1, 1);
        }

        public FormModel GetInputValues()
        {
            return new FormModel
            {
                FirstName = FirstNameEntry.Text,
                LastName = LastNameEntry.Text
            };
        }
    }
}


namespace StubbsTest.Views
{
    public class FormView : ContentPage
    {
        private Button _submitButton;
        private Button SubmitButton
        {
            get
            {
                if (_submitButton != null)
                {
                    return _submitButton;
                }

                var submitButton = new Button { Text = "Submit" };

                submitButton.Clicked += async (sender, args) =>
                {
                    var formData = Form.GetInputValues();
                    await DisplayAlert("Submitted", $"Thanks {formData.FirstName} {formData.LastName}!", "Close");
                };

                return _submitButton = submitButton;
            }
        }

        private FormComponent _form;
        private FormComponent Form => _form ?? (_form = new FormComponent());

        public FormView()
        {
            BackgroundImage = "bg.jpg";

            Content = new StackLayout
            {
                VerticalOptions = LayoutOptions.Center,
                HorizontalOptions = LayoutOptions.FillAndExpand,
                Children =
                {
                    Form,
                    SubmitButton
                }
            };
        }
    }
}