affederaffe
3 years ago
136 changed files with 2858 additions and 2050 deletions
@ -0,0 +1,216 @@ |
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using System; |
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using System.Collections.Generic; |
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using System.Threading; |
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using Avalonia.Utilities; |
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|
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namespace Avalonia.Threading; |
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|
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public partial class Dispatcher |
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{ |
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internal bool ExitAllFramesRequested { get; private set; } |
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internal bool HasShutdownStarted { get; private set; } |
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internal int DisabledProcessingCount { get; set; } |
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private bool _hasShutdownFinished; |
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private bool _startingShutdown; |
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private Stack<DispatcherFrame> _frames = new(); |
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/// <summary>
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/// Raised when the dispatcher is shutting down.
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/// </summary>
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public event EventHandler? ShutdownStarted; |
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/// <summary>
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/// Raised when the dispatcher is shut down.
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/// </summary>
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public event EventHandler? ShutdownFinished; |
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/// <summary>
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/// Push an execution frame.
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/// </summary>
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/// <param name="frame">
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/// The frame for the dispatcher to process.
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/// </param>
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public void PushFrame(DispatcherFrame frame) |
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{ |
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VerifyAccess(); |
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if (_controlledImpl == null) |
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throw new PlatformNotSupportedException(); |
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_ = frame ?? throw new ArgumentNullException(nameof(frame)); |
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if(_hasShutdownFinished) // Dispatcher thread - no lock needed for read
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throw new InvalidOperationException("Cannot perform requested operation because the Dispatcher shut down"); |
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if (DisabledProcessingCount > 0) |
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throw new InvalidOperationException( |
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"Cannot perform this operation while dispatcher processing is suspended."); |
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try |
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{ |
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_frames.Push(frame); |
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using (AvaloniaSynchronizationContext.Ensure(DispatcherPriority.Normal)) |
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frame.Run(_controlledImpl); |
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} |
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finally |
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{ |
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_frames.Pop(); |
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if (_frames.Count == 0) |
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{ |
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if (HasShutdownStarted) |
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ShutdownImpl(); |
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else |
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ExitAllFramesRequested = false; |
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} |
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} |
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} |
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|
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/// <summary>
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/// Runs the dispatcher's main loop.
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/// </summary>
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/// <param name="cancellationToken">
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/// A cancellation token used to exit the main loop.
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/// </param>
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public void MainLoop(CancellationToken cancellationToken) |
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{ |
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if (_controlledImpl == null) |
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throw new PlatformNotSupportedException(); |
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var frame = new DispatcherFrame(); |
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cancellationToken.Register(() => frame.Continue = false); |
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PushFrame(frame); |
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} |
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|
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/// <summary>
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/// Requests that all nested frames exit.
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/// </summary>
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public void ExitAllFrames() |
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{ |
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if (_frames.Count == 0) |
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return; |
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ExitAllFramesRequested = true; |
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foreach (var f in _frames) |
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f.MaybeExitOnDispatcherRequest(); |
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} |
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|
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/// <summary>
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/// Begins the process of shutting down the dispatcher.
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/// </summary>
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public void BeginInvokeShutdown(DispatcherPriority priority) => Post(StartShutdownImpl, priority); |
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/// <summary>
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/// Initiates the shutdown process of the Dispatcher synchronously.
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/// </summary>
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public void InvokeShutdown() => Invoke(StartShutdownImpl, DispatcherPriority.Send); |
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private void StartShutdownImpl() |
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{ |
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if (!_startingShutdown) |
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{ |
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// We only need this to prevent reentrancy if the ShutdownStarted event
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// tries to shut down again.
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_startingShutdown = true; |
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// Call the ShutdownStarted event before we actually mark ourselves
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// as shutting down. This is so the handlers can actually do work
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// when they get this event without throwing exceptions.
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ShutdownStarted?.Invoke(this, EventArgs.Empty); |
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HasShutdownStarted = true; |
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if (_frames.Count > 0) |
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ExitAllFrames(); |
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else ShutdownImpl(); |
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} |
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} |
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private void ShutdownImpl() |
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{ |
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DispatcherOperation? operation = null; |
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_impl.Timer -= PromoteTimers; |
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_impl.Signaled -= Signaled; |
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do |
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{ |
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lock (InstanceLock) |
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{ |
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if (_queue.MaxPriority != DispatcherPriority.Invalid) |
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{ |
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operation = _queue.Peek(); |
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} |
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else |
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{ |
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operation = null; |
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} |
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} |
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if (operation != null) |
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{ |
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operation.Abort(); |
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} |
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} while (operation != null); |
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_impl.UpdateTimer(null); |
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_hasShutdownFinished = true; |
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ShutdownFinished?.Invoke(this, EventArgs.Empty); |
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} |
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public record struct DispatcherProcessingDisabled : IDisposable |
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{ |
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private readonly SynchronizationContext? _oldContext; |
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private readonly bool _restoreContext; |
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private Dispatcher? _dispatcher; |
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internal DispatcherProcessingDisabled(Dispatcher dispatcher) |
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{ |
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_dispatcher = dispatcher; |
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} |
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internal DispatcherProcessingDisabled(Dispatcher dispatcher, SynchronizationContext? oldContext) : this( |
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dispatcher) |
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{ |
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_oldContext = oldContext; |
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_restoreContext = true; |
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} |
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public void Dispose() |
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{ |
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if(_dispatcher==null) |
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return; |
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_dispatcher.DisabledProcessingCount--; |
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_dispatcher = null; |
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if (_restoreContext) |
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SynchronizationContext.SetSynchronizationContext(_oldContext); |
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} |
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} |
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/// <summary>
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/// Disable the event processing of the dispatcher.
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/// </summary>
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/// <remarks>
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/// This is an advanced method intended to eliminate the chance of
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/// unrelated reentrancy. The effect of disabling processing is:
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/// 1) CLR locks will not pump messages internally.
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/// 2) No one is allowed to push a frame.
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/// 3) No message processing is permitted.
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/// </remarks>
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public DispatcherProcessingDisabled DisableProcessing() |
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{ |
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VerifyAccess(); |
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// Turn off processing.
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DisabledProcessingCount++; |
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var oldContext = SynchronizationContext.Current; |
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if (oldContext is AvaloniaSynchronizationContext or NonPumpingSyncContext) |
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return new DispatcherProcessingDisabled(this); |
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var helper = AvaloniaLocator.Current.GetService<NonPumpingLockHelper.IHelperImpl>(); |
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if (helper == null) |
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return new DispatcherProcessingDisabled(this); |
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SynchronizationContext.SetSynchronizationContext(new NonPumpingSyncContext(helper, oldContext)); |
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return new DispatcherProcessingDisabled(this, oldContext); |
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} |
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} |
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@ -0,0 +1,125 @@ |
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using System; |
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using System.Threading; |
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namespace Avalonia.Threading; |
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/// <summary>
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/// Representation of Dispatcher frame.
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/// </summary>
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public class DispatcherFrame |
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{ |
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private bool _exitWhenRequested; |
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private bool _continue; |
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private bool _isRunning; |
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private CancellationTokenSource? _cancellationTokenSource; |
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/// <summary>
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/// Constructs a new instance of the DispatcherFrame class.
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/// </summary>
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public DispatcherFrame() : this(true) |
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{ |
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} |
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public Dispatcher Dispatcher { get; } |
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/// <summary>
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/// Constructs a new instance of the DispatcherFrame class.
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/// </summary>
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/// <param name="exitWhenRequested">
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/// Indicates whether or not this frame will exit when all frames
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/// are requested to exit.
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/// <p/>
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/// Dispatcher frames typically break down into two categories:
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/// 1) Long running, general purpose frames, that exit only when
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/// told to. These frames should exit when requested.
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/// 2) Short running, very specific frames that exit themselves
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/// when an important criteria is met. These frames may
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/// consider not exiting when requested in favor of waiting
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/// for their important criteria to be met. These frames
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/// should have a timeout associated with them.
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/// </param>
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public DispatcherFrame(bool exitWhenRequested) |
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{ |
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Dispatcher = Dispatcher.UIThread; |
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Dispatcher.VerifyAccess(); |
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_exitWhenRequested = exitWhenRequested; |
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_continue = true; |
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} |
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/// <summary>
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/// Indicates that this dispatcher frame should exit.
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/// </summary>
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public bool Continue |
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{ |
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get |
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{ |
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// This method is free-threaded.
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// First check if this frame wants to continue.
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bool shouldContinue = _continue; |
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if (shouldContinue) |
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{ |
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// This frame wants to continue, so next check if it will
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// respect the "exit requests" from the dispatcher.
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if (_exitWhenRequested) |
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{ |
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Dispatcher dispatcher = Dispatcher; |
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// This frame is willing to respect the "exit requests" of
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// the dispatcher, so check them.
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if (dispatcher.ExitAllFramesRequested || dispatcher.HasShutdownStarted) |
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{ |
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shouldContinue = false; |
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} |
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} |
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} |
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return shouldContinue; |
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} |
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set |
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{ |
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// This method is free-threaded.
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lock (Dispatcher.InstanceLock) |
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{ |
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_continue = value; |
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if (!_continue) |
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_cancellationTokenSource?.Cancel(); |
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} |
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} |
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} |
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internal void Run(IControlledDispatcherImpl impl) |
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{ |
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// Since the actual platform run loop is controlled by a Cancellation token, we are restarting
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// it if frame still needs to run
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while (Continue) |
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RunCore(impl); |
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} |
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private void RunCore(IControlledDispatcherImpl impl) |
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{ |
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if (_isRunning) |
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throw new InvalidOperationException("This frame is already running"); |
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_isRunning = true; |
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try |
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{ |
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_cancellationTokenSource = new CancellationTokenSource(); |
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// Wake up the dispatcher in case it has pending jobs
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Dispatcher.RequestProcessing(); |
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impl.RunLoop(_cancellationTokenSource.Token); |
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} |
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finally |
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{ |
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_isRunning = false; |
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_cancellationTokenSource?.Cancel(); |
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_cancellationTokenSource = null; |
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} |
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} |
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internal void MaybeExitOnDispatcherRequest() |
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{ |
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if (_exitWhenRequested) |
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_cancellationTokenSource?.Cancel(); |
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} |
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} |
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@ -0,0 +1,26 @@ |
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namespace Avalonia.Controls |
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{ |
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/// <summary>
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/// Defines the position of a color's alpha component relative to all other components.
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/// </summary>
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public enum AlphaComponentPosition |
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{ |
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/// <summary>
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/// The alpha component occurs before all other components.
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/// </summary>
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/// <remarks>
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/// For example, this may indicate the #AARRGGBB or ARGB format which
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/// is the default format for XAML itself and the Color struct.
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/// </remarks>
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Leading, |
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/// <summary>
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/// The alpha component occurs after all other components.
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/// </summary>
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/// <remarks>
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/// For example, this may indicate the #RRGGBBAA or RGBA format which
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/// is the default format for CSS.
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/// </remarks>
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Trailing, |
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} |
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} |
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@ -1,24 +1,24 @@ |
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using System; |
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using System.ComponentModel; |
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using System.Globalization; |
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using Avalonia.Media; |
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namespace Avalonia.Markup.Xaml.Converters |
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{ |
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public class FontFamilyTypeConverter : TypeConverter |
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{ |
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public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) |
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/// <inheritdoc />
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public override bool CanConvertFrom(ITypeDescriptorContext? context, Type sourceType) |
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{ |
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return sourceType == typeof(string); |
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} |
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public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) |
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/// <inheritdoc />
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public override object ConvertFrom(ITypeDescriptorContext? context, CultureInfo? culture, object value) |
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{ |
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var s = (string)value; |
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return FontFamily.Parse(s, context.GetContextBaseUri()); |
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return FontFamily.Parse(s, context?.GetContextBaseUri()); |
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} |
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} |
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} |
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@ -1,33 +1,31 @@ |
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using System; |
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using System.Collections.Generic; |
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using System.Diagnostics.CodeAnalysis; |
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using System.Text; |
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using Avalonia.Data.Core.Plugins; |
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using Avalonia.Reactive; |
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namespace Avalonia.Markup.Xaml.MarkupExtensions.CompiledBindings |
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{ |
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class ObservableStreamPlugin<T> : IStreamPlugin |
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internal class ObservableStreamPlugin<T> : IStreamPlugin |
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{ |
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[RequiresUnreferencedCode(TrimmingMessages.StreamPluginRequiresUnreferencedCodeMessage)] |
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public bool Match(WeakReference<object> reference) |
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public bool Match(WeakReference<object?> reference) |
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{ |
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return reference.TryGetTarget(out var target) && target is IObservable<T>; |
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} |
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[RequiresUnreferencedCode(TrimmingMessages.StreamPluginRequiresUnreferencedCodeMessage)] |
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public IObservable<object> Start(WeakReference<object> reference) |
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public IObservable<object?> Start(WeakReference<object?> reference) |
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{ |
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if (!(reference.TryGetTarget(out var target) && target is IObservable<T> obs)) |
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{ |
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return Observable.Empty<object>(); |
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return Observable.Empty<object?>(); |
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} |
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else if (target is IObservable<object> obj) |
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else if (target is IObservable<object?> obj) |
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{ |
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return obj; |
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} |
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return obs.Select(x => (object)x); |
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return obs.Select(x => (object?)x); |
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} |
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} |
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} |
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|
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