osu/osu.Game/Overlays/NewsOverlay.cs

100 lines
2.5 KiB
C#

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System.Threading;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Game.Overlays.News;
using osu.Game.Overlays.News.Displays;
namespace osu.Game.Overlays
{
public class NewsOverlay : OnlineOverlay<NewsHeader>
{
private readonly Bindable<string> article = new Bindable<string>(null);
public NewsOverlay()
: base(OverlayColourScheme.Purple, false)
{
}
protected override void LoadComplete()
{
base.LoadComplete();
// should not be run until first pop-in to avoid requesting data before user views.
article.BindValueChanged(onArticleChanged);
}
protected override NewsHeader CreateHeader() => new NewsHeader
{
ShowFrontPage = ShowFrontPage
};
private bool displayUpdateRequired = true;
protected override void PopIn()
{
base.PopIn();
if (displayUpdateRequired)
{
article.TriggerChange();
displayUpdateRequired = false;
}
}
protected override void PopOutComplete()
{
base.PopOutComplete();
displayUpdateRequired = true;
}
public void ShowFrontPage()
{
article.Value = null;
Show();
}
public void ShowArticle(string slug)
{
article.Value = slug;
Show();
}
private CancellationTokenSource cancellationToken;
private void onArticleChanged(ValueChangedEvent<string> e)
{
cancellationToken?.Cancel();
Loading.Show();
if (e.NewValue == null)
{
Header.SetFrontPage();
LoadDisplay(new FrontPageDisplay());
return;
}
Header.SetArticle(e.NewValue);
LoadDisplay(Empty());
}
protected void LoadDisplay(Drawable display)
{
ScrollFlow.ScrollToStart();
LoadComponentAsync(display, loaded =>
{
Child = loaded;
Loading.Hide();
}, (cancellationToken = new CancellationTokenSource()).Token);
}
protected override void Dispose(bool isDisposing)
{
cancellationToken?.Cancel();
base.Dispose(isDisposing);
}
}
}