79 lines
2.6 KiB
C#
79 lines
2.6 KiB
C#
using Dinah.Core.Net.Http;
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using Dinah.Core.Windows.Forms;
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using FileLiberator;
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using System;
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using System.ComponentModel;
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using System.Threading;
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using System.Windows.Forms;
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namespace LibationWinForms.BookLiberation
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{
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public class StreamBaseForm : Form
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{
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private int InstanceThreadId { get; } = Thread.CurrentThread.ManagedThreadId;
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public new bool InvokeRequired => Thread.CurrentThread.ManagedThreadId != InstanceThreadId;
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private SynchronizationContext SyncContext { get; }
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public StreamBaseForm()
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{
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//Will be null if set outside constructor.
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SyncContext = SynchronizationContext.Current;
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}
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protected IStreamable Streamable { get; private set; }
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public void SetStreamable(IStreamable streamable)
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{
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Streamable = streamable;
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if (Streamable is null) return;
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OnUnsubscribeAll(this, EventArgs.Empty);
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Streamable.StreamingBegin += OnStreamingBegin;
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Streamable.StreamingCompleted += OnStreamingCompleted;
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Streamable.StreamingProgressChanged += OnStreamingProgressChanged;
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Streamable.StreamingTimeRemaining += OnStreamingTimeRemaining;
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FormClosed += OnUnsubscribeAll;
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}
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private void OnUnsubscribeAll(object sender, EventArgs e)
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{
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FormClosed -= OnUnsubscribeAll;
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Streamable.StreamingBegin -= OnStreamingBegin;
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Streamable.StreamingCompleted -= OnStreamingCompleted;
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Streamable.StreamingProgressChanged -= OnStreamingProgressChanged;
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Streamable.StreamingTimeRemaining -= OnStreamingTimeRemaining;
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}
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#region IStreamable event handlers
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public virtual void OnStreamingBegin(object sender, string beginString)
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{
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//If StreamingBegin is fired from a worker thread, the window will be created on
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//that UI thread. We need to make certain that we show the window on the same
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//thread that created form, otherwise the form and the window handle will be on
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//different threads. Form.BeginInvoke won't work until the form is created
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//(ie. shown) because control doesn't get a window handle until it is Shown.
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static void sendCallback(object asyncArgs)
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{
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var e = asyncArgs as AsyncCompletedEventArgs;
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((Action)e.UserState)();
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}
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Action show = Show;
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if (InvokeRequired)
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SyncContext.Send(
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sendCallback,
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new AsyncCompletedEventArgs(null, false, show));
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else
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show();
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}
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public virtual void OnStreamingProgressChanged(object sender, DownloadProgress downloadProgress) { }
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public virtual void OnStreamingTimeRemaining(object sender, TimeSpan timeRemaining) { }
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public virtual void OnStreamingCompleted(object sender, string completedString) => this.UIThread(() => Close());
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#endregion
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}
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}
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