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RefreshViewGallery.cs
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RefreshViewGallery.cs
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using System;
using System.Collections.ObjectModel;
using System.Windows.Input;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls.GalleryPages.RefreshViewGalleries
{
[Preserve(AllMembers = true)]
public class RefreshViewGallery : ContentPage
{
public RefreshViewGallery()
{
Title = "RefreshView Gallery";
var button = new Button
{
Text = "Enable CarouselView",
AutomationId = "EnableCarouselView"
};
button.Clicked += ButtonClicked;
Content = new StackLayout
{
Children =
{
button,
GalleryBuilder.NavButton("Refresh Layout Gallery", () => new RefreshLayoutGallery(), Navigation),
GalleryBuilder.NavButton("RefreshView using margins Gallery", () => new RefreshLayoutMarginGallery(), Navigation),
GalleryBuilder.NavButton("Refresh ScrollView Gallery", () => new RefreshScrollViewGallery(), Navigation),
GalleryBuilder.NavButton("Refresh ListView Gallery", () => new RefreshListViewGallery(), Navigation),
GalleryBuilder.NavButton("Refresh CollectionView Gallery", () => new RefreshCollectionViewGallery(), Navigation),
GalleryBuilder.NavButton("Refresh CarouselView Gallery", () => new RefreshCarouselViewGallery(), Navigation),
GalleryBuilder.NavButton("Refresh WebView Gallery", () => new RefreshWebViewGallery(), Navigation),
GalleryBuilder.NavButton("IsEnabled RefreshView Gallery", () => new IsEnabledRefreshViewGallery(), Navigation)
}
};
}
void ButtonClicked(object sender, System.EventArgs e)
{
var button = sender as Button;
button.Text = "CarouselView Enabled!";
button.TextColor = Color.Black;
button.IsEnabled = false;
Device.SetFlags(new[] { ExperimentalFlags.CarouselViewExperimental });
}
}
[Preserve(AllMembers = true)]
public class RefreshItem
{
public string Name { get; set; }
public Color Color { get; set; }
}
[Preserve(AllMembers = true)]
public class RefreshViewModel : BindableObject
{
const int RefreshDuration = 2;
readonly Random _random;
bool _isRefresing;
ObservableCollection<RefreshItem> _items;
public RefreshViewModel(bool initialRefresh = false)
{
_random = new Random();
Items = new ObservableCollection<RefreshItem>();
if (initialRefresh)
ExecuteRefresh();
else
LoadItems();
}
public bool IsRefreshing
{
get { return _isRefresing; }
set
{
_isRefresing = value;
OnPropertyChanged();
}
}
public ObservableCollection<RefreshItem> Items
{
get { return _items; }
set
{
_items = value;
OnPropertyChanged();
}
}
public ICommand RefreshCommand => new Command(ExecuteRefresh);
void LoadItems()
{
for (int i = 0; i < 50; i++)
{
Items.Insert(i, new RefreshItem
{
Color = Color.FromRgb(_random.Next(0, 255), _random.Next(0, 255), _random.Next(0, 255)),
Name = DateTime.Now.AddMinutes(i).ToString("F")
});
}
}
void ExecuteRefresh()
{
IsRefreshing = true;
Device.StartTimer(TimeSpan.FromSeconds(RefreshDuration), () =>
{
LoadItems();
IsRefreshing = false;
return false;
});
}
}
}