public void PropertyObserver_Observes_instance_IntProperty_AutoActivateFalse()
{
var instance = new NotifyPropertyChangedClass1()
{
Class2 = null
};
var callCount = 0;
using var observes = PropertyObserver.Observes(() => instance.Class2.IntProperty, false, () => callCount++);
Assert.AreEqual(0, callCount);
instance.Class2 = new NotifyPropertyChangedClass2 {
IntProperty = 1
};
Assert.AreEqual(0, callCount);
observes.Activate();
Assert.AreEqual(1, callCount);
instance.Class2.IntProperty = 2;
Assert.AreEqual(2, callCount);
observes.Deactivate();
Assert.AreEqual(2, callCount);
instance.Class2.IntProperty = 3;
Assert.AreEqual(2, callCount);
}
public void PropertyObserver_Observes_instance1_StringProperty_AutoActivateTrue()
{
var instance1 = new NotifyPropertyChangedClass1();
var instance2 = new NotifyPropertyChangedClass1();
var callCount = 0;
using var observes = PropertyObserver.Observes(
instance1,
instance2,
(i1, i2) => i1.StringProperty,
true,
() => callCount++);
Assert.AreEqual(0, callCount);
instance1.StringProperty = "1";
Assert.AreEqual(1, callCount);
instance1.StringProperty = "2";
Assert.AreEqual(2, callCount);
observes.Deactivate();
Assert.AreEqual(2, callCount);
instance1.StringProperty = "3";
Assert.AreEqual(2, callCount);
}
public void NotifyPropertyChanged_Integer_Subscribe()
{
var actionRaisedCount = 0;
var notifyPropertyChangedTestObject = new NotifyPropertyChangedTestObject {
IntProperty = 1
};
using var observer = PropertyObserver.Observes(
notifyPropertyChangedTestObject.IntPropertyExpression,
() => actionRaisedCount++,
false);
Assert.AreEqual(0, actionRaisedCount);
notifyPropertyChangedTestObject.IntProperty = 2;
Assert.AreEqual(0, actionRaisedCount);
observer.Subscribe();
notifyPropertyChangedTestObject.IntProperty = 3;
Assert.AreEqual(1, actionRaisedCount);
notifyPropertyChangedTestObject.IntProperty = 4;
Assert.AreEqual(2, actionRaisedCount);
observer.Unsubscribe();
notifyPropertyChangedTestObject.IntProperty = 5;
Assert.AreEqual(2, actionRaisedCount);
}
public void PropertyObserver_Getter_Fallback_Observes_instance_StringProperty_AutoActivateTrue()
{
var instance = new NotifyPropertyChangedClass1()
{
StringProperty = null
};
var callCount = 0;
using var observes = PropertyObserver.Observes(() => instance.StringProperty, true, () => callCount++, "Fallback");
Assert.AreEqual(0, callCount);
Assert.AreEqual("Fallback", observes.Value);
instance.StringProperty = "1";
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", observes.Value);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("3", observes.Value);
instance.StringProperty = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual("Fallback", observes.Value);
}
public void NotifyPropertyChanged_OwnerAndExpression_ObservesIntegerAndBoolean_Test()
{
var actionIntegerRaised = false;
var actionBooleanRaised = false;
var notifyPropertyChangedTestObject =
new NotifyPropertyChangedTestObject {
IntProperty = 1, BoolProperty = false
};
using var integerObserver = PropertyObserver.Observes(
notifyPropertyChangedTestObject,
o => o.IntProperty,
() => actionIntegerRaised = true);
using var booleanObserver = PropertyObserver.Observes(
notifyPropertyChangedTestObject,
o => o.BoolProperty,
() => actionBooleanRaised = true);
Assert.False(actionIntegerRaised);
Assert.False(actionBooleanRaised);
notifyPropertyChangedTestObject.BoolProperty = true;
Assert.True(actionBooleanRaised);
Assert.False(actionIntegerRaised);
notifyPropertyChangedTestObject.IntProperty = 2;
Assert.True(actionBooleanRaised);
Assert.True(actionIntegerRaised);
}
public void PropertyObserver_Getter_Fallback_Observes_instance_IntProperty_AutoActivateTrue()
{
var instance = new NotifyPropertyChangedClass1()
{
Class2 = null
};
var callCount = 0;
using var observes = PropertyObserver.Observes(() => instance.Class2.IntProperty, true, () => callCount++, 99);
Assert.AreEqual(0, callCount);
Assert.AreEqual(99, observes.Value);
instance.Class2 = new NotifyPropertyChangedClass2 {
IntProperty = 1
};
Assert.AreEqual(1, callCount);
Assert.AreEqual(1, observes.Value);
instance.Class2.IntProperty = 2;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, observes.Value);
instance.Class2.IntProperty = 3;
Assert.AreEqual(2, callCount);
Assert.AreEqual(3, observes.Value);
instance.Class2 = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual(99, observes.Value);
}
public void PropertyObserver_Observes_instance1_IntProperty_AutoActivateTrue()
{
var instance1 = new NotifyPropertyChangedClass1 {
Class2 = null
};
var instance2 = new NotifyPropertyChangedClass1 {
Class2 = null
};
var callCount = 0;
using var observes = PropertyObserver.Observes(
instance1,
instance2,
(i1, i2) => i1.Class2.IntProperty,
true,
() => callCount++);
Assert.AreEqual(0, callCount);
instance1.Class2 = new NotifyPropertyChangedClass2 {
IntProperty = 1
};
Assert.AreEqual(1, callCount);
instance1.Class2.IntProperty = 2;
Assert.AreEqual(2, callCount);
observes.Deactivate();
Assert.AreEqual(2, callCount);
instance1.Class2.IntProperty = 3;
Assert.AreEqual(2, callCount);
}
public void PropertyObserver_ValueGetter_Fallback_Observes_instance1_IntProperty_AutoActivateFalse()
{
var instance1 = new NotifyPropertyChangedClass1 {
Class2 = null
};
var instance2 = new NotifyPropertyChangedClass1 {
Class2 = null
};
var callCount = 0;
var value = -1;
using var observes = PropertyObserver.Observes(
instance1,
instance2,
(i1, i2) => i1.Class2.IntProperty,
false,
v =>
{
value = v;
callCount++;
},
99);
Assert.AreEqual(0, callCount);
Assert.AreEqual(-1, value);
Assert.AreEqual(99, observes.Value);
instance1.Class2 = new NotifyPropertyChangedClass2 {
IntProperty = 1
};
Assert.AreEqual(0, callCount);
Assert.AreEqual(-1, value);
Assert.AreEqual(1, observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual(1, value);
Assert.AreEqual(1, observes.Value);
instance1.Class2.IntProperty = 2;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(2, observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(2, observes.Value);
instance1.Class2.IntProperty = 3;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(3, observes.Value);
instance1.Class2 = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(99, observes.Value);
}
public void PropertyObserver_ValueGetter_Fallback_Observes_instance1_StringProperty_AutoActivateFalse()
{
var instance1 = new NotifyPropertyChangedClass1 {
StringProperty = null
};
var instance2 = new NotifyPropertyChangedClass1();
var callCount = 0;
var value = "Nil";
using var observes = PropertyObserver.Observes(
instance1,
instance2,
(i1, i2) => i1.StringProperty,
false,
v =>
{
value = v;
callCount++;
},
"Fallback");
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual("Fallback", observes.Value);
instance1.StringProperty = "1";
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual("1", observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", value);
Assert.AreEqual("1", observes.Value);
instance1.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
instance1.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("3", observes.Value);
instance1.StringProperty = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("Fallback", observes.Value);
}
public void NotifyPropertyChanged_SameAre_NotEqualOperator_Test()
{
var notifyPropertyChangedTestObject = new NotifyPropertyChangedTestObject();
using var observer1 = PropertyObserver.Observes(
notifyPropertyChangedTestObject.IntPropertyExpression,
() => { });
using var observer2 = PropertyObserver.Observes(
notifyPropertyChangedTestObject.IntPropertyExpression,
() => { });
Assert.False(observer1 != observer2);
}
public void NotifyPropertyChanged_Equal_1_Test()
{
var notifyPropertyChangedTestObject = new NotifyPropertyChangedTestObject();
using var observer1 = PropertyObserver.Observes(
notifyPropertyChangedTestObject.IntPropertyExpression,
() => { });
using var observer2 = PropertyObserver.Observes(
notifyPropertyChangedTestObject.IntPropertyExpression,
() => { });
Assert.True(observer1.Equals(observer2));
}
public void NotifyPropertyChanged_Integer_AutoActivate_False()
{
var actionRaised = false;
var notifyPropertyChangedTestObject = new NotifyPropertyChangedTestObject();
using var observer = PropertyObserver.Observes(
notifyPropertyChangedTestObject.IntPropertyExpression,
() => actionRaised = true, false);
Assert.False(actionRaised);
notifyPropertyChangedTestObject.IntProperty = 2;
Assert.False(actionRaised);
}
public void NotifyPropertyChanged_Different_NotEqualOperator_Test()
{
var notifyPropertyChangedTestObject = new NotifyPropertyChangedTestObject();
using var observer1 = PropertyObserver.Observes(
notifyPropertyChangedTestObject.BoolPropertyExpression,
() => { });
using var observer2 = PropertyObserver.Observes(
notifyPropertyChangedTestObject.IntPropertyExpression,
() => { });
Assert.True((object)observer1 != observer2);
}
public void NotifyPropertyChanged_Equal_2_Test()
{
var notifyPropertyChangedTestObject = new NotifyPropertyChangedTestObject();
using var observer1 = PropertyObserver.Observes(
notifyPropertyChangedTestObject.ComplexPropertyIntPropertyExpression,
() => { });
using var observer2 = PropertyObserver.Observes(
notifyPropertyChangedTestObject,
o => o.ComplexProperty.IntProperty,
() => { });
Assert.True(observer1 == observer2);
}
public void PropertyObserver_ValueGetter_Fallback_Observes_instance_IntProperty()
{
var instance = new NotifyPropertyChangedClass1()
{
Class2 = null
};
var callCount = 0;
var value = -1;
using var observes = PropertyObserver.Observes(() => instance.Class2.IntProperty, (v) =>
{
value = v;
callCount++;
}, 99);
Assert.AreEqual(0, callCount);
Assert.AreEqual(-1, value);
Assert.AreEqual(99, observes.Value);
instance.Class2 = new NotifyPropertyChangedClass2 {
IntProperty = 1
};
Assert.AreEqual(0, callCount);
Assert.AreEqual(-1, value);
Assert.AreEqual(1, observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual(1, value);
Assert.AreEqual(1, observes.Value);
instance.Class2.IntProperty = 2;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(2, observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(2, observes.Value);
instance.Class2.IntProperty = 3;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(3, observes.Value);
instance.Class2 = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, value);
Assert.AreEqual(99, observes.Value);
}
/// <summary>
/// Adds the expression.
/// </summary>
/// <param name="propertyExpression">The property expression.</param>
/// <exception cref="System.ArgumentException">propertyExpression</exception>
public void AddExpression(Expression <Func <T> > propertyExpression)
{
if (this.observedPropertiesExpressions.TryGetValue(propertyExpression.ToString(), out _))
{
throw new ArgumentException(
$"{propertyExpression} is already being observed.",
nameof(propertyExpression));
}
var observer = PropertyObserver.Observes(propertyExpression, () => this.Update.Raise());
this.observedPropertiesExpressions.Add(propertyExpression.ToString(), observer);
observer.Subscribe();
}
public void PropertyObserver_ValueGetter_Fallback_Observes_instance_StringProperty()
{
var instance = new NotifyPropertyChangedClass1()
{
StringProperty = null
};
var callCount = 0;
var value = "Nil";
using var observes = PropertyObserver.Observes(() => instance.StringProperty, (v) =>
{
value = v;
callCount++;
}, "Fallback");
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual("Fallback", observes.Value);
instance.StringProperty = "1";
Assert.AreEqual(0, callCount);
Assert.AreEqual("Nil", value);
Assert.AreEqual("1", observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", value);
Assert.AreEqual("1", observes.Value);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("2", observes.Value);
instance.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("3", observes.Value);
instance.StringProperty = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", value);
Assert.AreEqual("Fallback", observes.Value);
}
public void PropertyObserver_Getter_Fallback_Observes_instance1_IntProperty()
{
var instance1 = new NotifyPropertyChangedClass1 {
Class2 = null
};
var instance2 = new NotifyPropertyChangedClass1()
{
Class2 = null
};
var callCount = 0;
using var observes = PropertyObserver.Observes(
instance1,
instance2,
(i1, i2) => i1.Class2.IntProperty,
() => callCount++,
99);
Assert.AreEqual(0, callCount);
Assert.AreEqual(99, observes.Value);
instance1.Class2 = new NotifyPropertyChangedClass2 {
IntProperty = 1
};
Assert.AreEqual(0, callCount);
Assert.AreEqual(1, observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual(1, observes.Value);
instance1.Class2.IntProperty = 2;
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual(2, observes.Value);
instance1.Class2.IntProperty = 3;
Assert.AreEqual(2, callCount);
Assert.AreEqual(3, observes.Value);
instance1.Class2 = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual(99, observes.Value);
}
/// <summary>
/// Adds the expression.
/// </summary>
/// <typeparam name="TOwner">The type of the owner.</typeparam>
/// <param name="owner">The owner.</param>
/// <param name="propertyExpression">The property expression.</param>
/// <exception cref="ArgumentException">propertyExpression</exception>
public void AddExpression <TOwner>(TOwner owner, Expression <Func <TOwner, T> > propertyExpression)
where TOwner : INotifyPropertyChanged
{
if (this.observedPropertiesExpressions.TryGetValue(
owner.GetHashCode() + propertyExpression.ToString(),
out _))
{
throw new ArgumentException(
$"{propertyExpression} is already being observed.",
nameof(propertyExpression));
}
var observer = PropertyObserver.Observes(owner, propertyExpression, () => this.Update.Raise());
this.observedPropertiesExpressions.Add(owner.GetHashCode() + propertyExpression.ToString(), observer);
observer.Subscribe();
}
public void PropertyObserver_Getter_Fallback_Observes_instance1_StringProperty()
{
var instance1 = new NotifyPropertyChangedClass1 {
StringProperty = null
};
var instance2 = new NotifyPropertyChangedClass1();
var callCount = 0;
using var observes = PropertyObserver.Observes(
instance1,
instance2,
(i1, i2) => i1.StringProperty,
() => callCount++,
"Fallback");
Assert.AreEqual(0, callCount);
Assert.AreEqual("Fallback", observes.Value);
instance1.StringProperty = "1";
Assert.AreEqual(0, callCount);
Assert.AreEqual("1", observes.Value);
observes.Activate();
Assert.AreEqual(1, callCount);
Assert.AreEqual("1", observes.Value);
instance1.StringProperty = "2";
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
observes.Deactivate();
Assert.AreEqual(2, callCount);
Assert.AreEqual("2", observes.Value);
instance1.StringProperty = "3";
Assert.AreEqual(2, callCount);
Assert.AreEqual("3", observes.Value);
instance1.StringProperty = null;
Assert.AreEqual(2, callCount);
Assert.AreEqual("Fallback", observes.Value);
}
public void PropertyObserver_Observes_instance_StringProperty_AutoActivateFalse()
{
var instance = new NotifyPropertyChangedClass1();
var callCount = 0;
using var observes = PropertyObserver.Observes(() => instance.StringProperty, false, () => callCount++);
Assert.AreEqual(0, callCount);
instance.StringProperty = "1";
Assert.AreEqual(0, callCount);
observes.Activate();
Assert.AreEqual(1, callCount);
instance.StringProperty = "2";
Assert.AreEqual(2, callCount);
observes.Deactivate();
Assert.AreEqual(2, callCount);
instance.StringProperty = "3";
Assert.AreEqual(2, callCount);
}
public void NotifyPropertyChanged_OwnerAndExpressions_ComplexType_Test()
{
var canExecuteChangedRaiseCount = 0;
var notifyPropertyChangedTestObject = new NotifyPropertyChangedTestObject
{
ComplexProperty = new ComplexType
{
IntProperty = 1,
InnerComplexProperty =
new ComplexType
{
IntProperty = 1,
InnerComplexProperty =
new ComplexType
{
IntProperty
= 1
}
}
}
};
using var observer1 = PropertyObserver.Observes(
notifyPropertyChangedTestObject,
o => o.ComplexProperty.IntProperty,
() => canExecuteChangedRaiseCount++);
using var observer2 = PropertyObserver.Observes(
notifyPropertyChangedTestObject,
o => o.ComplexProperty.InnerComplexProperty.IntProperty,
() => canExecuteChangedRaiseCount++);
using var observer3 = PropertyObserver.Observes(
notifyPropertyChangedTestObject,
o => o.ComplexProperty.InnerComplexProperty.InnerComplexProperty.IntProperty,
() => canExecuteChangedRaiseCount++);
Assert.AreEqual(0, canExecuteChangedRaiseCount);
notifyPropertyChangedTestObject.ComplexProperty.IntProperty = 2;
Assert.AreEqual(1, canExecuteChangedRaiseCount);
notifyPropertyChangedTestObject.ComplexProperty.InnerComplexProperty.IntProperty = 2;
Assert.AreEqual(2, canExecuteChangedRaiseCount);
notifyPropertyChangedTestObject.ComplexProperty.InnerComplexProperty.InnerComplexProperty.IntProperty = 2;
Assert.AreEqual(3, canExecuteChangedRaiseCount);
var innerInnerComplexProp = notifyPropertyChangedTestObject.ComplexProperty.InnerComplexProperty
.InnerComplexProperty;
var innerComplexProp = notifyPropertyChangedTestObject.ComplexProperty.InnerComplexProperty;
var complexProp = notifyPropertyChangedTestObject.ComplexProperty;
Assert.AreEqual(1, innerInnerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(2, innerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(3, complexProp.GetPropertyChangedSubscribedLength());
notifyPropertyChangedTestObject.ComplexProperty = new ComplexType
{
InnerComplexProperty = new ComplexType
{
InnerComplexProperty =
new ComplexType()
}
};
Assert.AreEqual(6, canExecuteChangedRaiseCount);
Assert.AreEqual(0, innerInnerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(0, innerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(0, complexProp.GetPropertyChangedSubscribedLength());
innerInnerComplexProp = notifyPropertyChangedTestObject.ComplexProperty.InnerComplexProperty
.InnerComplexProperty;
innerComplexProp = notifyPropertyChangedTestObject.ComplexProperty.InnerComplexProperty;
complexProp = notifyPropertyChangedTestObject.ComplexProperty;
Assert.AreEqual(1, innerInnerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(2, innerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(3, complexProp.GetPropertyChangedSubscribedLength());
notifyPropertyChangedTestObject.ComplexProperty = null;
Assert.AreEqual(9, canExecuteChangedRaiseCount);
Assert.AreEqual(0, innerInnerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(0, innerComplexProp.GetPropertyChangedSubscribedLength());
Assert.AreEqual(0, complexProp.GetPropertyChangedSubscribedLength());
}
/// <summary>
/// Observes the given Property and Raises CanExecuteChanged when it changes
/// </summary>
public static RelayCommand Observes <T>(this RelayCommand command, Expression <Func <T> > propertyExpression)
{
PropertyObserver.Observes(propertyExpression, command.RaiseCanExecuteChanged);
return(command);
}
/// <summary>
/// Observes the given Property and refilteres to collection when it changes
/// </summary>
public static FilteredObservableCollection <TCommand> Observes <TCommand, TProp>(this FilteredObservableCollection <TCommand> command, Expression <Func <TProp> > propertyExpression)
{
PropertyObserver.Observes(propertyExpression, command.FilterChanged);
return(command);
}