public override void Dispose()
{
lock (_syncObj)
{
Detach();
if (_bindingDependency != null)
{
_bindingDependency.Detach();
_bindingDependency = null;
}
// Child bindings will be disposed automatically by DependencyObject.Dispose, because they are
// added to our binding collection (was done by method AddChild)
ResetBindingAttachments();
base.Dispose();
}
}
public void Dispose(bool passSourceToContextObject)
{
Detach();
if (_bindingDependency != null)
{
_bindingDependency.Detach();
_bindingDependency = null;
}
ResetChangeHandlerAttachments();
MPF.TryCleanupAndDispose(_valueConverter);
object source = Source;
if (passSourceToContextObject && source != null)
{
_contextObject.TakeOverOwnership(source);
}
else
{
MPF.TryCleanupAndDispose(source);
}
base.Dispose();
}
protected bool UpdateBinding()
{
// Avoid recursive calls: For instance, this can occur when the later call to Evaluate will change our evaluated
// source value, which will cause a recursive call to UpdateBinding.
if (_isUpdatingBinding)
{
return(false);
}
_isUpdatingBinding = true;
try
{
if (KeepBinding) // This is the case if our target descriptor has a binding type
{ // In this case, this instance should be used rather than the evaluated source value
if (_targetDataDescriptor != null)
{
_contextObject.SetBindingValue(_targetDataDescriptor, this);
}
_valueAssigned = true;
return(true);
}
IDataDescriptor sourceDd;
lock (_syncObj)
if (!Evaluate(out sourceDd))
{
_valueAssigned = false;
return(false);
}
// We're called multiple times, for example when a resource dictionary changes.
// To avoid too many updates, we remember the last updated value.
if (ReferenceEquals(sourceDd, _lastUpdatedValue) && !_valueAssigned)
{
return(true);
}
_lastUpdatedValue = sourceDd;
// Don't lock the following lines because the binding dependency object updates source or target objects.
// Holding a lock during that process would offend against the MP2 threading policy.
if (_bindingDependency != null)
{
_bindingDependency.Detach();
}
_bindingDependency = null;
switch (Mode)
{
case BindingMode.TwoWay:
case BindingMode.OneWayToSource:
throw new XamlBindingException(
"MultiBindingMarkupExtension doesn't support BindingMode.TwoWay and BindingMode.OneWayToSource");
case BindingMode.OneTime:
object value = sourceDd.Value;
_contextObject.SetBindingValue(_targetDataDescriptor, value);
_valueAssigned = true;
Dispose();
return(true); // In this case, we have finished with only assigning the value
default: // Mode == BindingMode.OneWay || Mode == BindingMode.Default
_bindingDependency = new BindingDependency(sourceDd, _targetDataDescriptor, true,
UpdateSourceTrigger.Explicit, null, null, null);
_valueAssigned = true;
break;
}
return(true);
}
finally
{
_isUpdatingBinding = false;
}
}
protected virtual bool UpdateBinding()
{
// Avoid recursive calls: For instance, this can occur when
// the later call to Evaluate will change our evaluated source value, which
// will cause a recursive call to UpdateBinding.
if (_isUpdatingBinding)
return false;
_isUpdatingBinding = true;
try
{
if (KeepBinding) // This is the case if our target descriptor has a binding type
{ // In this case, this instance should be used rather than the evaluated source value
if (_targetDataDescriptor != null)
_contextObject.SetBindingValue(_targetDataDescriptor, this);
_valueAssigned = true;
return true;
}
IDataDescriptor sourceDd;
if (!Evaluate(out sourceDd))
{
_valueAssigned = false;
return false;
}
// We're called multiple times, for example when a resource dictionary changes.
// To avoid too many updates, we remember the last updated value.
if (ReferenceEquals(sourceDd, _lastUpdatedValue) && !_valueAssigned)
return true;
_lastUpdatedValue = sourceDd;
#if DEBUG_BINDINGS
DebugOutput("UpdateBinding: Binding evaluated to '{0}'", sourceDd.Value);
#endif
if (_bindingDependency != null)
_bindingDependency.Detach();
bool attachToSource = false;
bool attachToTarget = false;
switch (Mode)
{
case BindingMode.Default:
case BindingMode.OneWay:
// Currently, we don't really support the Default binding mode in
// MediaPortal skin engine. Maybe we will support it in future -
// then we'll be able to initialize the mode with a default value
// implied by our target data endpoint.
attachToSource = true;
break;
case BindingMode.TwoWay:
attachToSource = true;
attachToTarget = true;
break;
case BindingMode.OneWayToSource:
attachToTarget = true;
break;
case BindingMode.OneTime:
object value = sourceDd.Value;
object convertedValue;
if (!Convert(value, _targetDataDescriptor.DataType, out convertedValue))
return false;
_contextObject.SetBindingValue(_targetDataDescriptor,
ReferenceEquals(value, convertedValue) ? MpfCopyManager.DeepCopyCutLVPs(convertedValue) : convertedValue);
_valueAssigned = true;
Dispose(true);
return true; // In this case, we have finished with only assigning the value
}
DependencyObject parent;
if (UpdateSourceTrigger != UpdateSourceTrigger.LostFocus ||
!FindAncestor(_contextObject, out parent, FindParentMode.HybridPreferVisualTree, -1, typeof(UIElement)))
parent = null;
_bindingDependency = new BindingDependency(sourceDd, _targetDataDescriptor, attachToSource,
attachToTarget ? UpdateSourceTrigger : UpdateSourceTrigger.Explicit,
parent as UIElement, _valueConverter, _converterParameter);
_valueAssigned = true;
return true;
}
finally
{
_isUpdatingBinding = false;
}
}
public void Dispose(bool passSourceToContextObject)
{
Detach();
if (_bindingDependency != null)
{
_bindingDependency.Detach();
_bindingDependency = null;
}
ResetChangeHandlerAttachments();
MPF.TryCleanupAndDispose(_valueConverter);
object source = Source;
if (passSourceToContextObject && source != null)
_contextObject.TakeOverOwnership(source);
else
MPF.TryCleanupAndDispose(source);
base.Dispose();
}
protected virtual bool UpdateBinding()
{
// Avoid recursive calls: For instance, this can occur when
// the later call to Evaluate will change our evaluated source value, which
// will cause a recursive call to UpdateBinding.
if (_isUpdatingBinding)
{
return(false);
}
_isUpdatingBinding = true;
try
{
if (KeepBinding) // This is the case if our target descriptor has a binding type
{ // In this case, this instance should be used rather than the evaluated source value
if (_targetDataDescriptor != null)
{
_contextObject.SetBindingValue(_targetDataDescriptor, this);
}
_valueAssigned = true;
return(true);
}
IDataDescriptor sourceDd;
if (!Evaluate(out sourceDd))
{
_valueAssigned = false;
return(false);
}
// We're called multiple times, for example when a resource dictionary changes.
// To avoid too many updates, we remember the last updated value.
if (ReferenceEquals(sourceDd, _lastUpdatedValue) && !_valueAssigned)
{
return(true);
}
_lastUpdatedValue = sourceDd;
#if DEBUG_BINDINGS
DebugOutput("UpdateBinding: Binding evaluated to '{0}'", sourceDd.Value);
#endif
if (_bindingDependency != null)
{
_bindingDependency.Detach();
}
bool attachToSource = false;
bool attachToTarget = false;
switch (Mode)
{
case BindingMode.Default:
case BindingMode.OneWay:
// Currently, we don't really support the Default binding mode in
// MediaPortal skin engine. Maybe we will support it in future -
// then we'll be able to initialize the mode with a default value
// implied by our target data endpoint.
attachToSource = true;
break;
case BindingMode.TwoWay:
attachToSource = true;
attachToTarget = true;
break;
case BindingMode.OneWayToSource:
attachToTarget = true;
break;
case BindingMode.OneTime:
object value = sourceDd.Value;
object convertedValue;
if (!Convert(value, _targetDataDescriptor.DataType, out convertedValue))
{
return(false);
}
_contextObject.SetBindingValue(_targetDataDescriptor,
ReferenceEquals(value, convertedValue) ? MpfCopyManager.DeepCopyCutLVPs(convertedValue) : convertedValue);
_valueAssigned = true;
Dispose(true);
return(true); // In this case, we have finished with only assigning the value
}
DependencyObject parent;
if (UpdateSourceTrigger != UpdateSourceTrigger.LostFocus ||
!FindAncestor(_contextObject, out parent, FindParentMode.HybridPreferVisualTree, -1, typeof(UIElement)))
{
parent = null;
}
_bindingDependency = new BindingDependency(sourceDd, _targetDataDescriptor, attachToSource,
attachToTarget ? UpdateSourceTrigger : UpdateSourceTrigger.Explicit,
parent as UIElement, _valueConverter, _converterParameter);
_valueAssigned = true;
return(true);
}
finally
{
_isUpdatingBinding = false;
}
}
