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RefreshViewCoreGalleyPage.cs
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RefreshViewCoreGalleyPage.cs
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using System;
using System.Windows.Input;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls
{
[Preserve(AllMembers = true)]
internal class RefreshViewCoreGalleryPage : CoreGalleryPage<RefreshView>
{
protected override bool SupportsFocus
{
get { return false; }
}
protected override bool SupportsScroll
{
get { return false; }
}
protected override void InitializeElement(RefreshView element)
{
base.InitializeElement(element);
BindingContext = new RefreshCoreGalleryViewModel();
element.Content = CreateContent();
element.SetBinding(RefreshView.CommandProperty, "RefreshCommand");
element.SetBinding(RefreshView.IsRefreshingProperty, "IsRefreshing");
}
protected override void Build(StackLayout stackLayout)
{
base.Build(stackLayout);
var refreshColorContainer = new ViewContainer<RefreshView>(Test.RefreshView.RefreshColor, new RefreshView
{
Content = CreateContent(),
RefreshColor = Color.Red
});
refreshColorContainer.View.SetBinding(RefreshView.CommandProperty, "RefreshCommand");
refreshColorContainer.View.SetBinding(RefreshView.IsRefreshingProperty, "IsRefreshing");
Add(refreshColorContainer);
}
ScrollView CreateContent()
{
var scrollView = new ScrollView
{
BackgroundColor = Color.Green,
HeightRequest = 250
};
var content = new Grid();
var refreshLabel = new Label
{
HorizontalOptions = LayoutOptions.Center,
VerticalOptions = LayoutOptions.Center,
TextColor = Color.White
};
refreshLabel.SetBinding(Label.TextProperty, "Info");
content.Children.Add(refreshLabel);
scrollView.Content = content;
return scrollView;
}
}
[Preserve(AllMembers = true)]
public class RefreshCoreGalleryViewModel : BindableObject
{
const int RefreshDuration = 1;
private bool _isRefresing;
private string _info;
public RefreshCoreGalleryViewModel()
{
Info = "RefreshView (Pull To Refresh)";
}
public bool IsRefreshing
{
get { return _isRefresing; }
set
{
_isRefresing = value;
OnPropertyChanged();
}
}
public string Info
{
get { return _info; }
set
{
_info = value;
OnPropertyChanged();
}
}
public ICommand RefreshCommand => new Command(ExecuteRefresh);
private void ExecuteRefresh()
{
IsRefreshing = true;
Device.StartTimer(TimeSpan.FromSeconds(RefreshDuration), () =>
{
IsRefreshing = false;
Info = "Refreshed (Pull To Refresh again)";
return false;
});
}
}
}