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using System;
using System.Linq;
using System.Collections.Generic;
using samples.core.Models;
using Xamarin.Forms;
using Xamarin.Forms.PlatformConfiguration.iOSSpecific;
using System.Collections.ObjectModel;
namespace samples.core.Views
{
public partial class RadioButtonView : ContentPage
{
private ObservableCollection<Grouping<string, RadioOption>> RadioOptionsList = new ObservableCollection<Grouping<string, RadioOption>>();
public RadioButtonView()
{
InitializeComponent();
On<Xamarin.Forms.PlatformConfiguration.iOS>().SetUseSafeArea(true);
Initialize();
}
public async void Handle_Clicked(object sender, EventArgs e)
{
await this.DisplayAlert("", "Your selections have been saved", "OK");
Initialize();
}
/// <summary>
/// Handles the item tapped.
/// </summary>
/// <param name="sender">Sender.</param>
/// <param name="e">E.</param>
public void Handle_ItemTapped(object sender, ItemTappedEventArgs e)
{
var item = e.Item as RadioOption;
if (item == null)
return;
// Somewhat inefficient way of ensuring only one item per group is
// selected. You could also perform logic to toggle state (assuming
// it is within reason to slect many per group.
//
// If we were using an MVVM framework, it would be smart ot move this
// logic to the ViewModel
foreach (var group in RadioOptionsList)
{
if (group.Contains(item))
{
foreach (var s in group.Where(x => x.IsSelected))
{
s.IsSelected = false;
}
item.IsSelected = true;
}
}
}
public void Handle_ItemSelected(object sender, SelectedItemChangedEventArgs e)
{
// Clear selected item so we don't have a lingering highlight of the last
// item tapped
ListView_Radio.SelectedItem = null;
}
private void Initialize()
{
// Build a list of items
var items = new List<RadioOption>()
{
new RadioOption(RadioCategory.CategoryA, "Red", true),
new RadioOption(RadioCategory.CategoryA, "Blue"),
new RadioOption(RadioCategory.CategoryA, "Green"),
new RadioOption(RadioCategory.CategoryA, "Yellow"),
new RadioOption(RadioCategory.CategoryA, "Transparent"),
new RadioOption(RadioCategory.CategoryB, "Marvel", true),
new RadioOption(RadioCategory.CategoryB, "DC"),
new RadioOption(RadioCategory.CategoryC, "Chicken", true),
new RadioOption(RadioCategory.CategoryC, "Steak"),
new RadioOption(RadioCategory.CategoryC, "Fish"),
new RadioOption(RadioCategory.CategoryC, "Vegetarian/Vegan"),
};
// Copy items into a grouping
var sorted = from item in items
group item by item.Category into radioGroups
select new Grouping<string, RadioOption>(radioGroups.Key.ToString(), radioGroups);
// Add to list
RadioOptionsList = new ObservableCollection<Grouping<string, RadioOption>>(sorted);
ListView_Radio.ItemsSource = RadioOptionsList;
}
}
}
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