/// <summary>
/// Internals the property change.
/// </summary>
/// <param name="modelInstance">The model instance.</param>
/// <param name="newValue">The new value.</param>
/// <param name="message">The message.</param>
private async void InternalPropertyChange(BindableBase modelInstance, TProperty newValue, string message)
{
//find out there will be a changing by makesure they are not equal
var changing = (this.EqualityComparer != null) ?
!this.EqualityComparer(newValue, _value) :
!Object.Equals(newValue, _value);
if (!changing)
{
return;
}
//fire changing event ask if anyone against changing
var changingArg = new ValueChangingEventArgs <TProperty>(message, _value, newValue);
modelInstance.RaisePropertyChanging(changingArg);
var oldvalue = _value;
_value = newValue;
await Task.Yield();
if (changingArg.Cancellation.IsCancellationRequested)
{
_value = oldvalue;
return;
}
if (ValueChanging != null)
{
ValueChanging.Invoke(this, changingArg);
await Task.Yield();
if (changingArg.Cancellation.IsCancellationRequested)
{
_value = oldvalue;
return;
}
}
if (NonGenericValueChanging != null)
{
NonGenericValueChanging.Invoke(this, changingArg);
await Task.Yield();
if (changingArg.Cancellation.IsCancellationRequested)
{
_value = oldvalue;
return;
}
}
ValueChangedEventArgs <TProperty> changedArg = new ValueChangedEventArgs <TProperty>(message, oldvalue, newValue);
modelInstance.RaisePropertyChanged(changedArg);
ValueChanged?.Invoke(this, changedArg);
NonGenericValueChanged?.Invoke(this, changedArg);
}
