mirror of
https://github.com/ppy/osu
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168 lines
6.0 KiB
C#
168 lines
6.0 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using osu.Framework.Allocation;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics.Containers;
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using osu.Game.Database;
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using osu.Game.Online.API;
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namespace osu.Game.Online
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{
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/// <summary>
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/// A component which tracks a <typeparamref name="TModel"/> through potential download/import/deletion.
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/// </summary>
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public abstract class DownloadTrackingComposite<TModel, TModelManager> : CompositeDrawable
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where TModel : class, IEquatable<TModel>
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where TModelManager : class, IModelDownloader<TModel>
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{
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protected readonly Bindable<TModel> Model = new Bindable<TModel>();
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[Resolved(CanBeNull = true)]
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private TModelManager manager { get; set; }
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/// <summary>
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/// Holds the current download state of the <typeparamref name="TModel"/>, whether is has already been downloaded, is in progress, or is not downloaded.
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/// </summary>
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protected readonly Bindable<DownloadState> State = new Bindable<DownloadState>();
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protected readonly BindableNumber<double> Progress = new BindableNumber<double> { MinValue = 0, MaxValue = 1 };
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protected DownloadTrackingComposite(TModel model = null)
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{
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Model.Value = model;
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}
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private IBindable<WeakReference<TModel>> managedUpdated;
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private IBindable<WeakReference<TModel>> managerRemoved;
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private IBindable<WeakReference<ArchiveDownloadRequest<TModel>>> managerDownloadBegan;
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private IBindable<WeakReference<ArchiveDownloadRequest<TModel>>> managerDownloadFailed;
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[BackgroundDependencyLoader(true)]
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private void load()
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{
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Model.BindValueChanged(modelInfo =>
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{
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if (modelInfo.NewValue == null)
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attachDownload(null);
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else if (manager?.IsAvailableLocally(modelInfo.NewValue) == true)
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State.Value = DownloadState.LocallyAvailable;
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else
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attachDownload(manager?.GetExistingDownload(modelInfo.NewValue));
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}, true);
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if (manager == null)
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return;
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managerDownloadBegan = manager.DownloadBegan.GetBoundCopy();
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managerDownloadBegan.BindValueChanged(downloadBegan);
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managerDownloadFailed = manager.DownloadFailed.GetBoundCopy();
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managerDownloadFailed.BindValueChanged(downloadFailed);
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managedUpdated = manager.ItemUpdated.GetBoundCopy();
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managedUpdated.BindValueChanged(itemUpdated);
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managerRemoved = manager.ItemRemoved.GetBoundCopy();
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managerRemoved.BindValueChanged(itemRemoved);
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}
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private void downloadBegan(ValueChangedEvent<WeakReference<ArchiveDownloadRequest<TModel>>> weakRequest)
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{
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if (weakRequest.NewValue.TryGetTarget(out var request))
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{
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Schedule(() =>
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{
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if (request.Model.Equals(Model.Value))
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attachDownload(request);
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});
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}
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}
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private void downloadFailed(ValueChangedEvent<WeakReference<ArchiveDownloadRequest<TModel>>> weakRequest)
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{
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if (weakRequest.NewValue.TryGetTarget(out var request))
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{
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Schedule(() =>
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{
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if (request.Model.Equals(Model.Value))
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attachDownload(null);
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});
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}
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}
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private ArchiveDownloadRequest<TModel> attachedRequest;
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private void attachDownload(ArchiveDownloadRequest<TModel> request)
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{
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if (attachedRequest != null)
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{
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attachedRequest.Failure -= onRequestFailure;
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attachedRequest.DownloadProgressed -= onRequestProgress;
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attachedRequest.Success -= onRequestSuccess;
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}
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attachedRequest = request;
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if (attachedRequest != null)
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{
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if (attachedRequest.Progress == 1)
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{
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State.Value = DownloadState.Importing;
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Progress.Value = 1;
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}
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else
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{
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State.Value = DownloadState.Downloading;
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Progress.Value = attachedRequest.Progress;
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attachedRequest.Failure += onRequestFailure;
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attachedRequest.DownloadProgressed += onRequestProgress;
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attachedRequest.Success += onRequestSuccess;
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}
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}
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else
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{
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State.Value = DownloadState.NotDownloaded;
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}
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}
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private void onRequestSuccess(string _) => Schedule(() => State.Value = DownloadState.Importing);
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private void onRequestProgress(float progress) => Schedule(() => Progress.Value = progress);
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private void onRequestFailure(Exception e) => Schedule(() => attachDownload(null));
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private void itemUpdated(ValueChangedEvent<WeakReference<TModel>> weakItem)
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{
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if (weakItem.NewValue.TryGetTarget(out var item))
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setDownloadStateFromManager(item, DownloadState.LocallyAvailable);
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}
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private void itemRemoved(ValueChangedEvent<WeakReference<TModel>> weakItem)
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{
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if (weakItem.NewValue.TryGetTarget(out var item))
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setDownloadStateFromManager(item, DownloadState.NotDownloaded);
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}
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private void setDownloadStateFromManager(TModel s, DownloadState state) => Schedule(() =>
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{
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if (!s.Equals(Model.Value))
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return;
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State.Value = state;
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});
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#region Disposal
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protected override void Dispose(bool isDisposing)
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{
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base.Dispose(isDisposing);
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State.UnbindAll();
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attachDownload(null);
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}
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#endregion
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}
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}
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