120 lines
4.0 KiB
C#
120 lines
4.0 KiB
C#
/*
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Copyright (C) 2014-2019 de4dot@gmail.com
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This file is part of dnSpy
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dnSpy is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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dnSpy is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with dnSpy. If not, see <http://www.gnu.org/licenses/>.
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*/
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using System;
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using System.Diagnostics;
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using System.Threading;
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using System.Threading.Tasks;
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using dnSpy.Roslyn.Internal.QuickInfo;
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using Microsoft.VisualStudio.Language.Intellisense;
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using Microsoft.VisualStudio.Text;
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using Microsoft.VisualStudio.Text.Editor;
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namespace dnSpy.Roslyn.Intellisense.QuickInfo {
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sealed class QuickInfoSession {
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/*readonly*/ SnapshotPoint triggerPoint;
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readonly bool trackMouse;
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readonly IQuickInfoBroker quickInfoBroker;
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readonly ITextView textView;
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CancellationTokenSource? cancellationTokenSource;
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CancellationToken cancellationToken;
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public event EventHandler? Disposed;
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public QuickInfoItem? Item { get; private set; }
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public QuickInfoState State { get; private set; }
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static readonly object thisInstanceKey = new object();
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public QuickInfoSession(QuickInfoState state, SnapshotPoint triggerPoint, bool trackMouse, IQuickInfoBroker quickInfoBroker, ITextView textView) {
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if (state.QuickInfoService is null)
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throw new ArgumentException();
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if (triggerPoint.Snapshot != state.Snapshot)
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throw new ArgumentNullException(nameof(triggerPoint));
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State = state;
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this.triggerPoint = triggerPoint;
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this.trackMouse = trackMouse;
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this.quickInfoBroker = quickInfoBroker ?? throw new ArgumentNullException(nameof(quickInfoBroker));
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this.textView = textView ?? throw new ArgumentNullException(nameof(textView));
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cancellationTokenSource = new CancellationTokenSource();
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cancellationToken = cancellationTokenSource.Token;
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}
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public void Start() => StartAsync()
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.ContinueWith(t => {
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var ex = t.Exception;
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Debug2.Assert(ex is null);
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}, CancellationToken.None, TaskContinuationOptions.None, TaskScheduler.FromCurrentSynchronizationContext());
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async Task StartAsync() {
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if (isDisposed || cancellationToken.IsCancellationRequested) {
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Dispose();
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return;
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}
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Item = await State.QuickInfoService.GetItemAsync(State.Document, triggerPoint.Position, cancellationToken);
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if (isDisposed || cancellationToken.IsCancellationRequested || Item is null) {
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Dispose();
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return;
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}
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DisposeCancellationToken();
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var trackingPoint = triggerPoint.Snapshot.CreateTrackingPoint(triggerPoint.Position, PointTrackingMode.Negative);
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var session = quickInfoBroker.CreateQuickInfoSession(textView, trackingPoint, trackMouse);
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session.Properties.AddProperty(thisInstanceKey, this);
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session.Dismissed += Session_Dismissed;
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session.Start();
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}
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public static QuickInfoSession? TryGetSession(IQuickInfoSession session) {
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if (session is null)
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return null;
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if (session.Properties.TryGetProperty(thisInstanceKey, out QuickInfoSession instance))
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return instance;
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return null;
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}
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void Session_Dismissed(object? sender, EventArgs e) {
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var session = (IQuickInfoSession)sender!;
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session.Dismissed -= Session_Dismissed;
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session.Properties.RemoveProperty(thisInstanceKey);
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Dispose();
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}
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void DisposeCancellationToken() {
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if (cancellationTokenSource is null)
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return;
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cancellationTokenSource.Cancel();
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cancellationTokenSource.Dispose();
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cancellationTokenSource = null;
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cancellationToken = CancellationToken.None;
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}
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public void Dispose() {
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if (isDisposed)
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return;
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isDisposed = true;
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Item = null;
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DisposeCancellationToken();
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Disposed?.Invoke(this, EventArgs.Empty);
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}
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bool isDisposed;
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}
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}
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