internal PropertyPathWalker(string path, bool isDatacontextBound)
{
_path = path;
_isDataContextBound = isDatacontextBound;
if (_isDataContextBound)
{
_firstNode = new DependencyPropertyNode(FrameworkElement.DataContextProperty);
}
ParsePath(_path, out IPropertyPathNode head, out IPropertyPathNode tail);
if (_firstNode == null)
{
_firstNode = head ?? new StandardPropertyPathNode();
}
else
{
_firstNode.Next = head;
}
FinalNode = tail ?? _firstNode;
FinalNode.Listen(this);
}
void IPropertyPathNodeListener.ValueChanged(IPropertyPathNode node)
{
ValueInternal = node.Value;
IPropertyPathWalkerListener listener = _listener;
if (listener != null)
{
listener.ValueChanged();
}
}
void IPropertyPathNodeListener.IsBrokenChanged(IPropertyPathNode node)
{
ValueInternal = node.Value;
var listener = _listener;
if (listener != null)
{
listener.IsBrokenChanged();
}
}
private void OnSourcePropertyChanged(object sender, PropertyChangedEventArgs e)
{
if ((e.PropertyName == _propertyName || string.IsNullOrEmpty(e.PropertyName)) && (_prop != null || _field != null))
{
UpdateValue();
IPropertyPathNode next = Next;
if (next != null)
{
next.SetSource(Value);
}
}
}
private void ParsePath(string path, out IPropertyPathNode head, out IPropertyPathNode tail)
{
head = null;
tail = null;
var parser = new PropertyPathParser(path);
PropertyNodeType type;
while ((type = parser.Step(out string typeName, out string propertyName, out string index)) != PropertyNodeType.None)
{
IPropertyPathNode node;
switch (type)
{
case PropertyNodeType.AttachedProperty:
case PropertyNodeType.Property:
node = new StandardPropertyPathNode(typeName, propertyName);
break;
case PropertyNodeType.Indexed:
node = new IndexedPropertyPathNode(index);
break;
default:
throw new InvalidOperationException();
}
if (head == null)
{
head = tail = node;
continue;
}
tail.Next = node;
tail = node;
}
}
/// <summary>
/// This method is used to check whether the value is Valid if needed.
/// </summary>
/// <param name="initialValue"></param>
internal void CheckInitialValueValidity(object initialValue)
{
if (ParentBinding.ValidatesOnExceptions && ParentBinding.ValidatesOnLoad)
{
if (!_propertyPathWalker.IsPathBroken)
{
INTERNAL_ForceValidateOnNextSetValue = false;
try
{
IPropertyPathNode node = _propertyPathWalker.FinalNode;
node.SetValue(node.Value); //we set the source property to its own value to check whether it causes an exception, in which case the value is not valid.
}
catch (Exception e) //todo: put the content of this catch in a method which will be called here and in UpdateSourceObject (OR put the whole try/catch in the method and put the Value to set as parameter).
{
//We get the new Error (which is the innermost exception as far as I know):
Exception currentException = e;
#if OPENSILVER
if (true) // Note: "InnerException" is only supported in the Simulator as of July 27, 2017.
#elif BRIDGE
if (CSHTML5.Interop.IsRunningInTheSimulator) // Note: "InnerException" is only supported in the Simulator as of July 27, 2017.
#endif
{
while (currentException.InnerException != null)
{
currentException = currentException.InnerException;
}
}
Validation.MarkInvalid(this, new ValidationError(this)
{
Exception = currentException, ErrorContent = currentException.Message
});
}
}
}
}
internal PropertyPathWalker(string path, bool isDatacontextBound)
{
Path = path;
StandardPropertyPathNode lastNode;
IsDataContextBound = isDatacontextBound;
if (path == null || path == ".")
{
//bindsDirectlyToSource set to true means that the binding is directly made to the source (--> there is no path)
lastNode = new StandardPropertyPathNode(); //what to put in there ?
FirstNode = lastNode;
FinalNode = lastNode;
}
else
{
PropertyNodeType type;
var parser = new PropertyPathParser(path);
string typeName;
string propertyName;
int index;
//IPropertyPathNode node;
while ((type = parser.Step(out typeName, out propertyName, out index)) != PropertyNodeType.None)
{
//we make node advance (when it is not the first step, otherwise it stays at null)
//node = FinalNode;
//var isViewProperty = false;
//boolean isViewProperty = CollectionViewProperties.Any (prop => prop.Name == propertyName);
// static readonly PropertyInfo[] CollectionViewProperties = typeof (ICollectionView).GetProperties ();
switch (type)
{
case PropertyNodeType.AttachedProperty:
case PropertyNodeType.Property:
if (FinalNode == null)
{
FinalNode = new StandardPropertyPathNode(typeName, propertyName);
}
else
{
FinalNode.Next = new StandardPropertyPathNode(typeName, propertyName);
}
break;
case PropertyNodeType.Indexed:
throw new NotImplementedException("Indexed properties are not supported yet.");
//todo: when we will handle the indexed properties, uncomment the following
//node.Next = new IndexedPropertyPathNode(index);
break;
default:
break;
}
if (FirstNode == null)
{
FirstNode = FinalNode;
}
if (FinalNode.Next != null)
{
FinalNode = FinalNode.Next;
}
}
}
this.FinalNode.Listen(this);
}
internal void UpdateSourceObject(object value)
{
if (_propertyPathWalker.IsPathBroken)
{
return;
}
IPropertyPathNode node = _propertyPathWalker.FinalNode;
bool oldIsUpdating = IsUpdating;
object convertedValue = value;
Type expectedType = node.Type;
try
{
if (expectedType != null && ParentBinding.Converter != null)
{
#if MIGRATION
convertedValue = ParentBinding.Converter.ConvertBack(value, expectedType, ParentBinding.ConverterParameter, ParentBinding.ConverterCulture);
#else
convertedValue = ParentBinding.Converter.ConvertBack(value, expectedType, ParentBinding.ConverterParameter, ParentBinding.ConverterLanguage);
#endif
if (convertedValue == DependencyProperty.UnsetValue)
{
return;
}
}
if (!IsValueValidForSourceUpdate(convertedValue, expectedType))
{
IsUpdating = true;
#if MIGRATION
convertedValue = DynamicConverter.Convert(convertedValue, expectedType, null, ParentBinding.ConverterCulture);
#else
convertedValue = DynamicConverter.Convert(convertedValue, expectedType, null, ParentBinding.ConverterLanguage);
#endif
if (convertedValue == DependencyProperty.UnsetValue)
{
return;
}
}
node.SetValue(convertedValue);
Validation.ClearInvalid(this);
}
catch (Exception e)
{
//If we have ValidatesOnExceptions set to true, we display a popup with the error close to the element.
if (ParentBinding.ValidatesOnExceptions)
{
//We get the new Error (which is the innermost exception as far as I know):
Exception currentException = e;
while (currentException.InnerException != null)
{
currentException = currentException.InnerException;
}
Validation.MarkInvalid(this, new ValidationError(this)
{
Exception = currentException, ErrorContent = currentException.Message
});
}
}
finally
{
IsUpdating = oldIsUpdating;
}
}
