// this is the callback that is called when a bound value in an IPropertyWatcher is changed
private void handleChange(string propertyName, IPropertyWatcher instance)
{
List <AbstractDataBinding> bindingList;
string propertyReference = makePropertyReference(instance.GUID, propertyName);
if (_bindings.TryGetValue(propertyReference, out bindingList))
{
// we're now handling this change, add it to the stack
_changesBeingHandled.Push(propertyReference);
foreach (var binding in bindingList)
{
if (_changesBeingHandled.Contains(binding.TargetReference))
{
// the Target of this change is one that we've already handled,
// so it will be no use setting it again
continue;
}
binding.Invoke();
}
// we've finished handling this change
_changesBeingHandled.Pop();
}
}
public void Bind <TType>(Expression <Func <TType> > binder, Expression <Func <TType> > bindee, BindingType bindingType)
{
var binderMemberExp = (MemberExpression)binder.Body;
IPropertyWatcher binderInstance = Expression.Lambda <Func <IPropertyWatcher> >(binderMemberExp.Expression).Compile()();
string binderReference = makePropertyReference(binderInstance.GUID, binderMemberExp.Member.Name);
var bindeeMemberExp = (MemberExpression)bindee.Body;
IPropertyWatcher bindeeInstance = Expression.Lambda <Func <IPropertyWatcher> >(bindeeMemberExp.Expression).Compile()();
string bindeeReference = makePropertyReference(bindeeInstance.GUID, bindeeMemberExp.Member.Name);
DataBinding <TType> binding = new DataBinding <TType>(binder, bindee, bindeeReference);
createBinding(binderReference, binding);
if (bindingType == BindingType.TwoWay)
{
DataBinding <TType> oppositeBinding = new DataBinding <TType>(bindee, binder, binderReference);
createBinding(bindeeReference, oppositeBinding);
}
}
/// <summary>
/// Deregister a data class with this BindBroker. This is the inverse of <c>RegisterData()</c>.
/// </summary>
/// <param name="watcher">Instance of the class (implementing IPropertyWatcher) to unbind.</param>
public void DeregisterData(IPropertyWatcher watcher)
{
watcher.OnPropertyChange -= handleChange;
}
