osu/osu.Game/Overlays/NewsOverlay.cs

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// 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;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
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using osu.Game.Overlays.News;
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using osu.Game.Overlays.News.Displays;
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namespace osu.Game.Overlays
{
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public class NewsOverlay : OnlineOverlay<NewsHeader>
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{
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private readonly Bindable<string> article = new Bindable<string>(null);
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public NewsOverlay()
: base(OverlayColourScheme.Purple, false)
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{
}
protected override void LoadComplete()
{
base.LoadComplete();
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// should not be run until first pop-in to avoid requesting data before user views.
article.BindValueChanged(onArticleChanged);
}
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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()
{
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article.Value = null;
Show();
}
public void ShowArticle(string slug)
{
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article.Value = slug;
Show();
}
private CancellationTokenSource cancellationToken;
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private void onArticleChanged(ValueChangedEvent<string> e)
{
cancellationToken?.Cancel();
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Loading.Show();
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if (e.NewValue == null)
{
Header.SetFrontPage();
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LoadDisplay(new FrontPageDisplay());
return;
}
Header.SetArticle(e.NewValue);
LoadDisplay(Empty());
}
protected void LoadDisplay(Drawable display)
{
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ScrollFlow.ScrollToStart();
LoadComponentAsync(display, loaded =>
{
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Child = loaded;
Loading.Hide();
}, (cancellationToken = new CancellationTokenSource()).Token);
}
protected override void Dispose(bool isDisposing)
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{
cancellationToken?.Cancel();
base.Dispose(isDisposing);
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}
}
}