private static List <object> GetFromClipboard(out List <object> metaData, EditingContext editingContext)
{
Fx.Assert(editingContext != null, "editingContext should not be null");
MultiTargetingSupportService multiTargetingService = editingContext.Services.GetService <IMultiTargetingSupportService>() as MultiTargetingSupportService;
DesignerConfigurationService config = editingContext.Services.GetService <DesignerConfigurationService>();
DataObject dataObject = RetriableClipboard.GetDataObject() as DataObject;
List <object> workflowData = null;
metaData = null;
if (dataObject != null)
{
if (dataObject.GetDataPresent(WorkflowClipboardFormat))
{
bool isCopyingFromHigherFrameworkToLowerFramework = false;
if (multiTargetingService != null && config != null)
{
isCopyingFromHigherFrameworkToLowerFramework = GetTargetFrameworkFromClipboard(dataObject).Version > config.TargetFrameworkName.Version;
}
string clipBoardString = (string)TryGetData(dataObject, WorkflowClipboardFormat);
using (StringReader stringReader = new StringReader(clipBoardString))
{
try
{
XamlSchemaContext schemaContext;
if (isCopyingFromHigherFrameworkToLowerFramework)
{
schemaContext = new MultiTargetingXamlSchemaContext(multiTargetingService);
}
else
{
schemaContext = new XamlSchemaContext();
}
using (XamlXmlReader xamlXmlReader = new XamlXmlReader(stringReader, schemaContext))
{
ClipboardData clipboardData = (ClipboardData)XamlServices.Load(xamlXmlReader);
metaData = clipboardData.Metadata;
workflowData = clipboardData.Data;
}
}
catch (Exception e)
{
Trace.WriteLine(e.Message);
}
}
}
else if (dataObject.GetDataPresent(WorkflowCallbackClipboardFormat))
{
ClipboardData localData = (ClipboardData)TryGetData(dataObject, WorkflowCallbackClipboardFormat);
metaData = null;
workflowData = localData.Data;
workflowData.Add(CutCopyPasteHelper.workflowCallbackContext);
}
}
return(workflowData);
}
public static bool CanPaste(EditingContext context)
{
if (context == null)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("context"));
}
bool result = false;
ModelItem primarySelection = context.Items.GetValue <Selection>().PrimarySelection;
if (null != primarySelection)
{
ICompositeView container = GetContainerForPaste(primarySelection, new Point(-1, -1));
if (null != container)
{
DataObject dataObject = RetriableClipboard.GetDataObject() as DataObject;
if (null != dataObject)
{
List <object> metaData = null;
List <object> itemsToPaste = null;
try
{
if (dataObject.GetDataPresent(WorkflowClipboardFormat))
{
itemsToPaste = GetFromClipboard(out metaData, context);
result = container.CanPasteItems(itemsToPaste);
}
else if (dataObject.GetDataPresent(WorkflowCallbackClipboardFormat))
{
itemsToPaste = GetFromClipboard(out metaData, context);
result = container.CanPasteItems(itemsToPaste.GetRange(0, 1));
}
}
//This is being defensive for the case where user code for CanPasteITems throws a non-fatal exception.
catch (Exception exp)
{
if (Fx.IsFatal(exp))
{
throw;
}
}
}
}
}
return(result);
}