private void AddBlankComponent(DataFlowComponentVisualisation.Role role)
{
DataFlowComponentVisualisation toAdd = new DataFlowComponentVisualisation(role, null, component_shouldAllowDrop);
toAdd.DragDrop += component_DragDrop;
flpPipelineDiagram.Controls.Add(toAdd);
}
public AdvertisedPipelineComponentTypeUnderContext(Type componentType, IPipelineUseCase useCase)
{
_componentType = componentType;
_role = DataFlowComponentVisualisation.GetRoleFor(componentType);
var context = useCase.GetContext();
_allowableUnderContext = context.IsAllowable(componentType, out _allowableReason);
Type[] initializationTypes;
var initializationObjects = useCase.GetInitializationObjects();
//it is permitted to specify only Types as initialization objects if it is design time and the user hasn't picked any objects to execute the use case under
if (useCase.IsDesignTime && initializationObjects.All(t => t is Type))
{
initializationTypes = initializationObjects.Cast <Type>().ToArray();
}
else
{
initializationTypes = useCase.GetInitializationObjects().Select(o => o.GetType()).ToArray();
}
foreach (var requiredInputType in context.GetIPipelineRequirementsForType(componentType))
{
//if there are no initialization objects that are instances of an IPipelineRequirement<T> then we cannot satisfy the components pipeline requirements (e.g. a component DelimitedFlatFileDataFlowSource requires a FlatFileToLoad but pipeline is trying to load from a database reference)
if (!initializationTypes.Any(available => requiredInputType == available || requiredInputType.IsAssignableFrom(available)))
{
unmetRequirements.Add(requiredInputType);
}
}
}
private DragDropEffects component_shouldAllowDrop(DragEventArgs arg, DataFlowComponentVisualisation sender)
{
var obj = GetAdvertisedObjectFromDragOperation(arg);
//if they are dragging a new component
if (obj != null)
{
//of the correct role and the source/destination is empty
if (sender.Value == null && obj.GetRole() == sender.GetRole())
{
return(DragDropEffects.Move);
}
}
return(DragDropEffects.None);
}
private void AddExplicit(object value)
{
var role = DataFlowComponentVisualisation.GetRoleFor(value.GetType());
var component = new DataFlowComponentVisualisation(role, value, null);
flpPipelineDiagram.Controls.Add(component);//add the explicit component
component.IsLocked = true;
try
{
if (!_useCase.IsDesignTime)
{
_useCase.GetContext().PreInitializeGeneric(new ThrowImmediatelyDataLoadEventListener(), component.Value, _useCase.GetInitializationObjects().ToArray());
}
}
catch (Exception e)
{
ExceptionViewer.Show("PreInitialize failed on Explicit (locked component) " + component.Value.GetType().Name, e);
}
}
