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145 lines
4.8 KiB
C#
145 lines
4.8 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 <see cref="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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private TModelManager manager;
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/// <summary>
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/// Holds the current download state of the <see cref="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 Bindable<double> Progress = new Bindable<double>();
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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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[BackgroundDependencyLoader(true)]
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private void load(TModelManager manager)
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{
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this.manager = manager;
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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))
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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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manager.DownloadBegan += downloadBegan;
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manager.DownloadFailed += downloadFailed;
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manager.ItemAdded += itemAdded;
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manager.ItemRemoved += itemRemoved;
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}
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private void downloadBegan(ArchiveDownloadRequest<TModel> request)
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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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private void downloadFailed(ArchiveDownloadRequest<TModel> request)
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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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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.Downloaded;
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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.Downloaded);
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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 itemAdded(TModel s) => setDownloadStateFromManager(s, DownloadState.LocallyAvailable);
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private void itemRemoved(TModel s) => setDownloadStateFromManager(s, DownloadState.NotDownloaded);
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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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if (manager != null)
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{
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manager.DownloadBegan -= downloadBegan;
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manager.DownloadFailed -= downloadFailed;
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manager.ItemAdded -= itemAdded;
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manager.ItemRemoved -= itemRemoved;
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}
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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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