tsai
/
Avalonia
mirror of https://github.com/AvaloniaUI/Avalonia.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity
Browse Source

Avoid NullReferenceException in Gestures.PointerReleased (#15117) 

* refs #14249 Avoid NullReferenceException in Gestures.PointerReleased

* refs #14249 Track current gesture state with single readonly struct

* Update from review

* Moved the last click location from the GestureState record to a separate field. (#14249)

---------

Co-authored-by: Заболотнев Юрий <zabolotnev@promit-ek.ru>
pull/15258/head
zabolotnev 2 years ago
committed by GitHub
parent
16ff8cdc8b
commit
04c62859f5
No known key found for this signature in database GPG Key ID: B5690EEEBB952194
1 changed files with 29 additions and 29 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 58
      src/Avalonia.Base/Input/Gestures.cs

58
src/Avalonia.Base/Input/Gestures.cs
View File

@ -10,8 +10,17 @@ namespace Avalonia.Input
{
public static class Gestures
{
private static bool s_isDoubleTapped = false;
private static bool s_isHolding;
private record struct GestureState(GestureStateType Type, IPointer Pointer);
private enum GestureStateType
{
Pending,
Holding,
DoubleTapped
}
private static GestureState? s_gestureState = null;
private static readonly WeakReference<object?> s_lastPress = new WeakReference<object?>(null);
private static Point s_lastPressPoint;
private static CancellationTokenSource? s_holdCancellationToken;
/// <summary>
@ -65,10 +74,6 @@ namespace Avalonia.Input
RoutedEvent.Register<PointerDeltaEventArgs>(
"PointerSwipeGesture", RoutingStrategies.Bubble, typeof(Gestures));
private static readonly WeakReference<object?> s_lastPress = new WeakReference<object?>(null);
private static Point s_lastPressPoint;
private static IPointer? s_lastHeldPointer;
public static readonly RoutedEvent<PinchEventArgs> PinchEvent =
RoutedEvent.Register<PinchEventArgs>(
"PinchEvent", RoutingStrategies.Bubble, typeof(Gestures));
@ -225,26 +230,23 @@ namespace Avalonia.Input
var e = (PointerPressedEventArgs)ev;
var visual = (Visual)ev.Source;
if(s_lastHeldPointer != null)
if(s_gestureState != null)
{
if(s_isHolding && ev.Source is Interactive i)
if(s_gestureState.Value.Type == GestureStateType.Holding && ev.Source is Interactive i)
{
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled, s_lastPressPoint, s_lastHeldPointer.Type, e));
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled, s_lastPressPoint, s_gestureState.Value.Pointer.Type, e));
}
s_holdCancellationToken?.Cancel();
s_holdCancellationToken?.Dispose();
s_holdCancellationToken = null;
s_lastHeldPointer = null;
s_gestureState = null;
}
s_isHolding = false;
if (e.ClickCount % 2 == 1)
{
s_isDoubleTapped = false;
s_gestureState = new GestureState(GestureStateType.Pending, e.Pointer);
s_lastPress.SetTarget(ev.Source);
s_lastHeldPointer = e.Pointer;
s_lastPressPoint = e.GetPosition((Visual)ev.Source);
s_holdCancellationToken = new CancellationTokenSource();
var token = s_holdCancellationToken.Token;
@ -254,10 +256,10 @@ namespace Avalonia.Input
{
DispatcherTimer.RunOnce(() =>
{
if (!token.IsCancellationRequested && e.Source is InputElement i && GetIsHoldingEnabled(i) && (e.Pointer.Type != PointerType.Mouse || GetIsHoldWithMouseEnabled(i)))
if (s_gestureState != null && !token.IsCancellationRequested && e.Source is InputElement i && GetIsHoldingEnabled(i) && (e.Pointer.Type != PointerType.Mouse || GetIsHoldWithMouseEnabled(i)))
{
s_isHolding = true;
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Started, s_lastPressPoint, s_lastHeldPointer.Type, e));
s_gestureState = new GestureState(GestureStateType.Holding, s_gestureState.Value.Pointer);
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Started, s_lastPressPoint, s_gestureState.Value.Pointer.Type, e));
}
}, settings.HoldWaitDuration);
}
@ -268,7 +270,7 @@ namespace Avalonia.Input
target == e.Source &&
e.Source is Interactive i)
{
s_isDoubleTapped = true;
s_gestureState = new GestureState(GestureStateType.DoubleTapped, e.Pointer);
i.RaiseEvent(new TappedEventArgs(DoubleTappedEvent, e));
}
}
@ -294,23 +296,22 @@ namespace Avalonia.Input
if (tapRect.ContainsExclusive(point.Position))
{
if (s_isHolding)
if (s_gestureState?.Type == GestureStateType.Holding)
{
s_isHolding = false;
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Completed, s_lastPressPoint, s_lastHeldPointer!.Type, e));
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Completed, s_lastPressPoint, s_gestureState.Value.Pointer.Type, e));
}
else if (e.InitialPressMouseButton == MouseButton.Right)
{
i.RaiseEvent(new TappedEventArgs(RightTappedEvent, e));
}
//s_isDoubleTapped needed here to prevent invoking Tapped event when DoubleTapped is called.
//GestureStateType.DoubleTapped needed here to prevent invoking Tapped event when DoubleTapped is called.
//This behaviour matches UWP behaviour.
else if (s_isDoubleTapped == false)
else if (s_gestureState?.Type != GestureStateType.DoubleTapped)
{
i.RaiseEvent(new TappedEventArgs(TappedEvent, e));
}
}
s_lastHeldPointer = null;
s_gestureState = null;
}
s_holdCancellationToken?.Cancel();
@ -326,7 +327,7 @@ namespace Avalonia.Input
var e = (PointerEventArgs)ev;
if (s_lastPress.TryGetTarget(out var target))
{
if (e.Pointer == s_lastHeldPointer && ev.Source is Interactive i)
if (e.Pointer == s_gestureState?.Pointer && ev.Source is Interactive i)
{
var point = e.GetCurrentPoint((Visual)target);
var settings = ((IInputRoot?)i.GetVisualRoot())?.PlatformSettings;
@ -339,10 +340,9 @@ namespace Avalonia.Input
return;
}
if (s_isHolding)
if (s_gestureState.Value.Type == GestureStateType.Holding)
{
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled, s_lastPressPoint, s_lastHeldPointer!.Type, e));
s_lastHeldPointer = null;
i.RaiseEvent(new HoldingRoutedEventArgs(HoldingState.Cancelled, s_lastPressPoint, s_gestureState.Value.Pointer.Type, e));
}
}
}
@ -350,7 +350,7 @@ namespace Avalonia.Input
s_holdCancellationToken?.Cancel();
s_holdCancellationToken?.Dispose();
s_holdCancellationToken = null;
s_isHolding = false;
s_gestureState = null;
}
}
}

Write Preview
Loading…
Cancel
Save