[Kde-bindings] Animating custom properties in Qyoto (Q_PROPERTY)

[Lorenz Cuno Klopfenstein]

Hello all,
I'm back with another question about the Qyoto/C# bindings to Qt.

I've started using the QPropertyAnimation system of Qt 4.6, which
works really well with Qyoto. However, I've yet been unable to figure
out how to declare a custom property on an object and then animate it.
For instance, animating an existing QWidget property works perfectly
fine:

	var pb = new QPushButton("Hello", parent);
	
	var anim = new QPropertyAnimation(pb, "geometry");
	anim.Duration = 3000;
	anim.StartValue = new QRect(0, 0, 0, 0);
	anim.EndValue = new QRect(0, 0, 400, 400);
	anim.Start(QAbstractAnimation.DeletionPolicy.DeleteWhenStopped);

However, if I try to declare a custom property on a class deriving
from QObject (or QWidget):

	class MyObject : QObject {
		int _prop = 100;
		
		[Q_PROPERTY("int", "animProp")]
		public int AnimProp {
			get { return _prop; }
			set {
				_prop = value;
				Console.WriteLine("Prop {0}", value);
			}
		}
	}

attempting to animate the custom property like this:

	var obj = new MyObject();
	var anim = new QPropertyAnimation(obj, "animProp");
	anim.Duration = 2000;
	anim.StartValue = 0;
	anim.EndValue = 1000;
	anim.Start(QAbstractAnimation.DeletionPolicy.DeleteWhenStopped);

always results in a crash.
The crash stacktrace is as follows:

Unhandled exception: System.Reflection.AmbiguousMatchException:
Ambiguous matching in method resolution
	  at System.Reflection.Binder.FindMostDerivedMatch
(System.Reflection.MethodBase[] match) [0x00000]
	  at System.MonoType.GetMethodImpl (System.String name, BindingFlags
bindingAttr, System.Reflection.Binder binder, CallingConventions
callConvention, System.Type[] types,
System.Reflection.ParameterModifier[] modifiers) [0x00000]
	  at System.Type.GetMethod (System.String name, BindingFlags
bindingAttr) [0x00000]
	  at Qyoto.SmokeMarshallers.GetProperty (IntPtr obj, System.String
propertyName) [0x00000]
	  at (wrapper native-to-managed) Qyoto.SmokeMarshallers:GetProperty
(intptr,intptr)
	  at (wrapper managed-to-native)
Qyoto.SmokeInvocation:CallSmokeMethod (intptr,int,intptr,intptr,int)
	  at Qyoto.SmokeInvocation.Invoke (System.String mungedName,
System.String signature, System.Type returnType, System.Object[] args)
[0x00000]
	  at Qyoto.QPropertyAnimation..ctor (Qyoto.QObject target,
Qyoto.QByteArray propertyName) [0x00000]
	  at TestQyotoAnim.MainClass.Main (System.String[] args) [0x00000]

It appears Qyoto is unable to resolve the correct property accessor to
use. I'm guessing the way I use the Q_PROPERTY attribute is somehow
wrong, but it appears to be similar to what I found in the rest of the
Qyoto source code.

Thank you for your time.
Regards,

-- 
Lorenz Cuno Klopfenstein
lck at klopfenstein.net
http://lorenz.klopfenstein.net
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