public static void Delete(EditingContext context)
{
if (context == null)
{
throw FxTrace.Exception.AsError(new ArgumentNullException("context"));
}
Selection selection = context.Items.GetValue <Selection>();
if (null != selection)
{
bool selectRoot = false;
DesignerView designerView = context.Services.GetService <DesignerView>();
var toDelete = selection.SelectedObjects.Where(p => null != p.View && p.View is WorkflowViewElement && !p.View.Equals(designerView.RootDesigner));
if (toDelete.Count() > 0)
{
using (EditingScope es = (EditingScope)toDelete.FirstOrDefault().BeginEdit(SR.DeleteOperationEditingScopeDescription))
{
Dictionary <ICompositeView, List <ModelItem> > containerToModelItemsDict = new Dictionary <ICompositeView, List <ModelItem> >();
List <ModelItem> modelItemsPerContainer;
foreach (var item in toDelete)
{
ICompositeView container = (ICompositeView)DragDropHelper.GetCompositeView((WorkflowViewElement)item.View);
if (null != container)
{
if (!containerToModelItemsDict.TryGetValue(container, out modelItemsPerContainer))
{
modelItemsPerContainer = new List <ModelItem>();
containerToModelItemsDict.Add(container, modelItemsPerContainer);
}
modelItemsPerContainer.Add(item);
}
}
foreach (ICompositeView container in containerToModelItemsDict.Keys)
{
container.OnItemsDelete(containerToModelItemsDict[container]);
selectRoot = true;
}
if (selectRoot)
{
DesignerView view = context.Services.GetService <DesignerView>();
if (null != view)
{
WorkflowViewElement rootView = view.RootDesigner as WorkflowViewElement;
if (rootView != null)
{
Selection.SelectOnly(context, rootView.ModelItem);
}
}
}
es.Complete();
}
}
}
}
static ICompositeView GetContainerForPaste(ModelItem pasteModelItem, Point clickPoint)
{
ICompositeView pasteContainer = null;
if (null != pasteModelItem && null != pasteModelItem.View && pasteModelItem.View is WorkflowViewElement)
{
pasteContainer = ((WorkflowViewElement)pasteModelItem.View).ActiveCompositeView;
}
if (null == pasteContainer)
{
//Get clicked container.
if (clickPoint.X > 0 && clickPoint.Y > 0)
{
pasteContainer = GetClickedContainer(pasteModelItem, clickPoint);
}
//If the container itself is a WVE, there's posibility that it's collapsed.
//Thus, we need to check this as well.
if (pasteContainer != null && pasteContainer is WorkflowViewElement)
{
WorkflowViewElement view = pasteContainer as WorkflowViewElement;
if (!view.ShowExpanded)
{
pasteContainer = null;
}
}
else if (pasteContainer == null) //If the modelitem.View itself is a container.
{
WorkflowViewElement view = pasteModelItem.View as WorkflowViewElement;
if (view != null && view.ShowExpanded)
{
pasteContainer = pasteModelItem.View as ICompositeView;
}
}
//Get the container registered with modelItem.View if unambigous
//If nothing works take the container with keyboard focus if one exists.
if (pasteContainer == null)
{
HashSet <ICompositeView> childrenContainers = CutCopyPasteHelper.GetChildContainers(pasteModelItem.View as WorkflowViewElement);
if ((childrenContainers == null || childrenContainers.Count == 0) && null != pasteModelItem.View)
{
pasteContainer = (ICompositeView)DragDropHelper.GetCompositeView((WorkflowViewElement)pasteModelItem.View);
}
else if (null != childrenContainers && childrenContainers.Count == 1)
{
pasteContainer = new List <ICompositeView>(childrenContainers)[0];
}
else
{
pasteContainer = Keyboard.FocusedElement as ICompositeView;
}
}
}
return(pasteContainer);
}
// 1) obj with CompositeView2: sort by IMultipleDragEnabledCompositeView SortSelectedItems.
// 2) obj with CompoisteView: no sort.
// 3) obj without CompositeView: just put them at the end of the list as the order in selectedObjects.
internal static List <object> SortSelectedObjects(IEnumerable <object> selectedObjects)
{
//1) Separate objects
Dictionary <ICompositeView, List <ModelItem> > viewItemListDictionary = new Dictionary <ICompositeView, List <ModelItem> >();
List <object> nonCompositeView = new List <object>();
List <object> retList = new List <object>();
foreach (object obj in selectedObjects)
{
ModelItem modelItem = obj as ModelItem;
if (modelItem == null || modelItem.View == null)
{
nonCompositeView.Add(obj);
continue;
}
ICompositeView container = DragDropHelper
.GetCompositeView(modelItem.View as WorkflowViewElement) as ICompositeView;
if (container == null)
{
nonCompositeView.Add(obj);
continue;
}
// add to dictionary.
if (!viewItemListDictionary.ContainsKey(container))
{
viewItemListDictionary.Add(container, new List <ModelItem>());
}
viewItemListDictionary[container].Add(modelItem);
}
// 2) sort when possible
foreach (KeyValuePair <ICompositeView, List <ModelItem> > pair in viewItemListDictionary)
{
IMultipleDragEnabledCompositeView view2 = pair.Key as IMultipleDragEnabledCompositeView;
List <ModelItem> sortedList = view2 == null ?
pair.Value : view2.SortSelectedItems(new List <ModelItem>(pair.Value));
if (!AreListsIdenticalExceptOrder(pair.Value, sortedList))
{
// check consistens.
throw FxTrace.Exception.AsError(
new InvalidOperationException(SR.Error_BadOutputFromSortSelectedItems));
}
retList.AddRange(sortedList);
}
retList.AddRange(nonCompositeView);
return(retList);
}
bool AllowDragging()
{
Selection selection = this.Context.Items.GetValue <Selection>();
if (!this.DraggingMultipleItemsEnabled)
{
if (selection.SelectionCount != 1)
{
return(false);
}
}
return(selection.SelectedObjects.All <ModelItem>((p) =>
{
return p != null && p != p.Root && p.View != null && ((WorkflowViewElement)p.View).IsVisible &&
(DragDropHelper.GetCompositeView((WorkflowViewElement)p.View) as ICompositeView) != null;
}));
}
//This is more efficient than walking up the VisualTree looking for WorkflowViewElements.
//Assuming that Cut-Copy will always be against selected elements.
//This implies that only elements under the BreadCrumbRoot can be cut/copied.
static List <WorkflowViewElement> GetSelectableParentViewElements(WorkflowViewElement childElement)
{
List <WorkflowViewElement> parentViewElements = new List <WorkflowViewElement>();
if (childElement != null)
{
UIElement breadcrumbRoot = childElement.Context.Services.GetService <DesignerView>().RootDesigner;
ICompositeView container = (ICompositeView)DragDropHelper.GetCompositeView(childElement);
while (!childElement.Equals(breadcrumbRoot) && container != null)
{
childElement = CutCopyPasteHelper.GetParentViewElement(container);
Fx.Assert(childElement != null, "container should be present in a WorkflowViewElement");
parentViewElements.Add(childElement);
container = (ICompositeView)DragDropHelper.GetCompositeView(childElement);
}
}
return(parentViewElements);
}
private List <WorkflowViewElement> ObjectList2WorkflowViewElementList(IEnumerable <object> droppedObjects)
{
List <WorkflowViewElement> movedViewElements = new List <WorkflowViewElement>();
foreach (object droppedObject in droppedObjects)
{
if (droppedObject is ModelItem && ((ModelItem)droppedObject).View != null)
{
WorkflowViewElement view = (WorkflowViewElement)((ModelItem)droppedObject).View;
WorkflowItemPresenter container = DragDropHelper.GetCompositeView(view) as WorkflowItemPresenter;
if (container != this)
{
movedViewElements.Add(view);
}
}
}
return(movedViewElements);
}
void StartDragging()
{
try
{
using (ModelEditingScope editingScope = this.ModelItem.BeginEdit(SR.MoveEditingScopeDescription, true))
{
HashSet <WorkflowViewElement> draggedViews = new HashSet <WorkflowViewElement>();
Dictionary <ModelItem, ICompositeView> sourceContainers = new Dictionary <ModelItem, ICompositeView>();
HashSet <ICompositeView> compViewSet = new HashSet <ICompositeView>();
Selection selection = this.Context.Items.GetValue <Selection>();
IEnumerable <ModelItem> selectedObjects = selection.SelectedObjects;
IEnumerable <ModelItem> modelItemsToDrag = DragDropHelper.GetModelItemsToDrag(selectedObjects);
// Save the source containers for the dragged items
foreach (ModelItem modelItem in modelItemsToDrag)
{
WorkflowViewElement view = (WorkflowViewElement)modelItem.View;
draggedViews.Add(view);
ICompositeView container = DragDropHelper.GetCompositeView(view) as ICompositeView;
sourceContainers.Add(modelItem, container);
// If Add returns true => the container is added the first time, which is always ok
// If Add returns false => the container is added more than once
// it must be a IMultipleDragEnabledCompositeView, otherwise, return, because
// we don't support dragging from ICompositeView.
if (!compViewSet.Add(container) && !(container is IMultipleDragEnabledCompositeView))
{
return;
}
}
// Calculate the anchor point for the dragged items
Point relativeLocation = GetRelativeLocation(draggedViews);
Point referencePoint = this.lastMouseDownPoint;
referencePoint.Offset(relativeLocation.X, relativeLocation.Y);
DataObject dataObject = DragDropHelper.DoDragMoveImpl(draggedViews, referencePoint);
IEnumerable <WorkflowViewElement> movedViewElements = DragDropHelper.GetDragDropMovedViewElements(dataObject);
// once drag drop is done make sure the CompositeView is notified of the change in data
if (movedViewElements != null)
{
Dictionary <ICompositeView, List <ModelItem> > containerMovedModelItemList = new Dictionary <ICompositeView, List <ModelItem> >();
// Create containerMovedModelItemList
foreach (WorkflowViewElement view in movedViewElements)
{
ICompositeView compView = DragDropHelper.GetCompositeView(view) as ICompositeView;
Fx.Assert(compView != null, "not an ICompositeView");
if (!containerMovedModelItemList.ContainsKey(compView))
{
containerMovedModelItemList.Add(compView, new List <ModelItem>());
}
containerMovedModelItemList[compView].Add(view.ModelItem);
}
// Call OnItemsMoved to notify the source container.
foreach (KeyValuePair <ICompositeView, List <ModelItem> > pair in containerMovedModelItemList)
{
if (pair.Key is IMultipleDragEnabledCompositeView)
{
((IMultipleDragEnabledCompositeView)pair.Key).OnItemsMoved(pair.Value);
}
else
{
if (pair.Value.Count >= 2)
{
throw FxTrace.Exception.AsError(
new InvalidOperationException(SR.Error_MovingMoreThanOneItemsFromICompositeView));
}
pair.Key.OnItemMoved(pair.Value[0]);
}
}
// animation
foreach (WorkflowViewElement view in movedViewElements)
{
BeginDropAnimation(view);
}
}
// the drop target is using old DragDropHelper API and did not set the moved view elements
else
{
DragDropEffects executedDragDropEffect = DragDropHelper.GetDragDropCompletedEffects(dataObject);
if (executedDragDropEffect == DragDropEffects.Move)
{
if (modelItemsToDrag.Count() == 1)
{
ModelItem movedItem = modelItemsToDrag.First <ModelItem>();
sourceContainers[movedItem].OnItemMoved(movedItem);
BeginDropAnimation((WorkflowViewElement)movedItem.View);
}
else
{
throw FxTrace.Exception.AsError(new InvalidOperationException(SR.DraggingMulitpleItemsError));
}
}
}
editingScope.Complete();
bool dropHappened = movedViewElements != null ||
DragDropHelper.GetDragDropCompletedEffects(dataObject) == DragDropEffects.Move;
if (dropHappened)
{
// add the selected objects back into selection.
this.Dispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle, (Action)(() =>
{
foreach (ModelItem item in selectedObjects)
{
// We need only the first one
IInputElement viewToFocus = item == null ? null : item.View as IInputElement;
if (viewToFocus != null)
{
Keyboard.Focus(viewToFocus);
break;
}
}
this.Context.Items.SetValue(new Selection(selectedObjects));
}));
}
}
}
catch (Exception e)
{
ErrorReporting.ShowErrorMessage(e.Message);
}
}
static void CutCopyOperation(List <ModelItem> modelItemsToCutCopy, EditingContext context, bool isCutOperation)
{
List <object> objectsOnClipboard = null;
List <object> metaData = null;
if (modelItemsToCutCopy.Count > 0)
{
objectsOnClipboard = new List <object>(modelItemsToCutCopy.Count);
metaData = new List <object>();
Dictionary <ICompositeView, List <ModelItem> > notifyDictionary = new Dictionary <ICompositeView, List <ModelItem> >();
UIElement breadCrumbRootView = ((DesignerView)context.Services.GetService <DesignerView>()).RootDesigner;
foreach (ModelItem modelItem in modelItemsToCutCopy)
{
object currentElement = modelItem.GetCurrentValue();
if (typeof(Activity).IsAssignableFrom(currentElement.GetType()))
{
string fileName;
if (AttachablePropertyServices.TryGetProperty(currentElement, XamlDebuggerXmlReader.FileNameName, out fileName))
{
AttachablePropertyServices.RemoveProperty(currentElement, XamlDebuggerXmlReader.FileNameName);
}
}
if (modelItem.View != null)
{
//The case where the breadcrumbroot designer is Cut/Copied. We do not delete the root designer, we only copy it.
if (breadCrumbRootView.Equals(modelItem.View))
{
notifyDictionary.Clear();
objectsOnClipboard.Add(modelItem.GetCurrentValue());
break;
}
else
{
ICompositeView container = (ICompositeView)DragDropHelper.GetCompositeView((WorkflowViewElement)modelItem.View);
if (container != null)
{
//If the parent and some of its children are selected and cut/copied, we ignore the children.
//The entire parent will be cut/copied.
//HashSet parentModelItems contains all the model items in the parent chain of current modelItem.
//We use HashSet.IntersectWith operation to determine if one of the parents is set to be cut.
HashSet <ModelItem> parentModelItems = CutCopyPasteHelper.GetSelectableParentModelItems(modelItem);
parentModelItems.IntersectWith(modelItemsToCutCopy);
if (parentModelItems.Count == 0)
{
if (!notifyDictionary.ContainsKey(container))
{
notifyDictionary[container] = new List <ModelItem>();
}
notifyDictionary[container].Add(modelItem);
}
}
}
}
}
foreach (ICompositeView container in notifyDictionary.Keys)
{
object containerMetaData = false;
if (isCutOperation)
{
containerMetaData = container.OnItemsCut(notifyDictionary[container]);
}
else
{
containerMetaData = container.OnItemsCopied(notifyDictionary[container]);
}
if (containerMetaData != null)
{
metaData.Add(containerMetaData);
}
//Put the actual activities and not the modelItems in the clipboard.
foreach (ModelItem modelItem in notifyDictionary[container])
{
objectsOnClipboard.Add(modelItem.GetCurrentValue());
}
}
if (metaData.Count == 0)
{
metaData = null;
}
}
try
{
FrameworkName targetFramework = context.Services.GetService <DesignerConfigurationService>().TargetFrameworkName;
PutOnClipBoard(objectsOnClipboard, metaData, targetFramework);
}
catch (XamlObjectReaderException exception)
{
if (modelItemsToCutCopy.Count > 0 && ErrorActivity.GetHasErrorActivities(modelItemsToCutCopy[0].Root.GetCurrentValue()))
{
ErrorReporting.ShowErrorMessage(SR.CutCopyErrorActivityMessage);
}
else
{
ErrorReporting.ShowErrorMessage(exception.Message);
}
}
}
void OnItemsDropped(DragEventArgs e, int index)
{
ModelItemHelper.TryCreateImmediateEditingScopeAndExecute(this.Items.GetEditingContext(), System.Activities.Presentation.SR.CollectionAddEditingScopeDescription, (es) =>
{
DragDropHelper.SetDragDropCompletedEffects(e, DragDropEffects.None);
List <object> droppedObjects = new List <object>(DragDropHelper.GetDroppedObjects(this, e, Context));
List <WorkflowViewElement> movedViewElements = new List <WorkflowViewElement>();
List <object> externalMoveList = new List <object>();
List <ModelItem> internalMoveList = new List <ModelItem>();
// Step 1: Sort the list
List <object> sortedDroppingList = DragDropHelper.SortSelectedObjects(droppedObjects);
// Step 2: Categorize dropped objects by their source container.
foreach (object droppedObject in sortedDroppingList)
{
ModelItem modelItem = droppedObject as ModelItem;
WorkflowViewElement view = (modelItem == null) ? null : (modelItem.View as WorkflowViewElement);
if (view == null)
{
externalMoveList.Add(droppedObject);
continue;
}
UIElement container = DragDropHelper.GetCompositeView(view);
if (container == this)
{
internalMoveList.Add(modelItem);
continue;
}
movedViewElements.Add(view);
externalMoveList.Add(droppedObject);
}
// Step 3: Internal movement
if (this.ShouldMoveItems(internalMoveList, index))
{
foreach (ModelItem modelItem in internalMoveList)
{
int oldIndex = this.Items.IndexOf(modelItem);
this.Items.Remove(modelItem);
//if element is placed ahead of old location, decrement the index not to include moved object
if (oldIndex < index)
{
this.InsertItem(index - 1, modelItem);
}
else
{
this.InsertItem(index, modelItem);
index++;
}
}
}
// Step 4: External move and drop from toolbox
foreach (object droppedObject in externalMoveList)
{
if (!this.IsDropAllowed(droppedObject))
{
continue;
}
this.InsertItem(index++, droppedObject);
DragDropHelper.SetDragDropCompletedEffects(e, DragDropEffects.Move);
}
DragDropHelper.SetDragDropMovedViewElements(e, movedViewElements);
e.Handled = true;
if (es != null)
{
es.Complete();
}
});
}
