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//----------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//----------------------------------------------------------------
namespace System.Activities.Presentation
{
using System.Diagnostics;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;
using System.Windows.Shapes;
using System.Activities.Presentation.Hosting;
using System.Activities.Presentation.Model;
using System.Activities.Presentation.View;
using System.Windows.Threading;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Activities.Presentation.Internal.PropertyEditing;
using System.Runtime;
using System.Reflection;
using System.Activities.Presentation.Sqm;
using System.Collections.Generic;
using System.Windows.Controls;
using System.Linq;
using Microsoft.Activities.Presentation;
// This is a helper class for making dragdrop inside workflow designer easy. This abstracts out te encoding formats used in the
// DataObject that is passed on from Drag source to target.
public static class DragDropHelper
{
// Using a DependencyProperty as the backing store for MyProperty. This enables animation, styling, binding, etc...
public static readonly DependencyProperty DragSourceProperty =
DependencyProperty.RegisterAttached("DragSource", typeof(UIElement), typeof(DragDropHelper), new UIPropertyMetadata(null));
public static readonly string ModelItemDataFormat;
public static readonly string CompositeViewFormat;
public static readonly string CompletedEffectsFormat = "DragCompletedEffectsFormat";
public static readonly string WorkflowItemTypeNameFormat = "WorkflowItemTypeNameFormat";
public static readonly string DragAnchorPointFormat;
internal static readonly string ModelItemsDataFormat;
internal static readonly string MovedViewElementsFormat;
[SuppressMessage("Microsoft.Performance", "CA1810:InitializeReferenceTypeStaticFieldsInline")]
static DragDropHelper()
{
string postfix = Guid.NewGuid().ToString();
//set per process unique data format names - this will disable possibility of trying to drag & drop operation
//between designers in two different VS instances (use Cut-Copy-Paste for that)
ModelItemDataFormat = string.Format(CultureInfo.InvariantCulture, "ModelItemFormat_{0}", postfix);
CompositeViewFormat = string.Format(CultureInfo.InvariantCulture, "CompositeViewFormat_{0}", postfix);
DragAnchorPointFormat = string.Format(CultureInfo.InvariantCulture, "DragAnchorFormat_{0}", postfix);
ModelItemsDataFormat = string.Format(CultureInfo.InvariantCulture, "ModelItemsFormat_{0}", postfix);
MovedViewElementsFormat = string.Format(CultureInfo.InvariantCulture, "MovedViewElementsFormat_{0}", postfix);
}
[SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
public static void SetCompositeView(WorkflowViewElement workflowViewElement, UIElement dragSource)
{
if (workflowViewElement == null)
{
throw FxTrace.Exception.ArgumentNull("workflowViewElement");
}
if (dragSource == null)
{
throw FxTrace.Exception.ArgumentNull("dragSource");
}
workflowViewElement.SetValue(DragDropHelper.DragSourceProperty, dragSource);
}
[SuppressMessage("Microsoft.Design", "CA1011:ConsiderPassingBaseTypesAsParameters")]
public static UIElement GetCompositeView(WorkflowViewElement workflowViewElement)
{
if (workflowViewElement == null)
{
throw FxTrace.Exception.ArgumentNull("workflowViewElement");
}
return (UIElement)workflowViewElement.GetValue(DragDropHelper.DragSourceProperty);
}
internal static DataObject DoDragMoveImpl(IEnumerable<WorkflowViewElement> draggedViewElements, Point referencePoint)
{
List<ModelItem> draggedModelItems = new List<ModelItem>();
bool first = true;
WorkflowViewElement viewElement = null;
foreach (WorkflowViewElement view in draggedViewElements)
{
if (view != null)
{
if (first)
{
viewElement = view;
first = false;
}
draggedModelItems.Add(view.ModelItem);
view.IsHitTestVisible = false;
}
}
DataObject dataObject = new DataObject(ModelItemsDataFormat, draggedModelItems);
// For compatiblity
if (viewElement != null)
{
dataObject.SetData(ModelItemDataFormat, viewElement.ModelItem);
dataObject.SetData(CompositeViewFormat, GetCompositeView(viewElement));
}
dataObject.SetData(DragAnchorPointFormat, referencePoint);
if (viewElement != null)
{
DesignerView designerView = viewElement.Context.Services.GetService<DesignerView>();
ViewElementDragShadow dragShadow = new ViewElementDragShadow(designerView.scrollableContent, draggedViewElements, referencePoint, designerView.ZoomFactor);
designerView.BeginDragShadowTracking(dragShadow);
//whenever drag drop fails - ensure getting rid of drag shadow
try
{
DragDrop.DoDragDrop(designerView, dataObject, DragDropEffects.Move | DragDropEffects.Copy | DragDropEffects.Scroll | DragDropEffects.Link);
}
catch
{
//let the caller handle exception
throw;
}
finally
{
designerView.EndDragShadowTracking(dragShadow);
foreach (WorkflowViewElement view in draggedViewElements)
{
if (view != null)
{
view.IsHitTestVisible = true;
}
}
}
}
return dataObject;
}
[Obsolete("This method does not support dragging multiple items. Use \"public static IEnumerable<WorkflowViewElement> DoDragMove(IEnumerable<WorkflowViewElement> draggedViewElements, Point referencePoint)\" instead.")]
public static DragDropEffects DoDragMove(WorkflowViewElement draggedViewElement, Point referencePoint)
{
if (draggedViewElement == null)
{
throw FxTrace.Exception.ArgumentNull("draggedViewElement");
}
if (referencePoint == null)
{
throw FxTrace.Exception.ArgumentNull("referencePoint");
}
ModelItem draggedActivityModelItem = draggedViewElement.ModelItem;
DataObject dataObject = new DataObject(ModelItemDataFormat, draggedActivityModelItem);
dataObject.SetData(CompositeViewFormat, GetCompositeView(draggedViewElement));
dataObject.SetData(DragAnchorPointFormat, referencePoint);
List<ModelItem> draggedModelItems = new List<ModelItem>();
draggedModelItems.Add(draggedActivityModelItem);
dataObject.SetData(ModelItemsDataFormat, draggedModelItems);
DesignerView view = draggedViewElement.Context.Services.GetService<DesignerView>();
ViewElementDragShadow dragShadow = new ViewElementDragShadow(view.scrollableContent, draggedViewElement, referencePoint, view.ZoomFactor);
draggedViewElement.IsHitTestVisible = false;
view.BeginDragShadowTracking(dragShadow);
//whenever drag drop fails - ensure getting rid of drag shadow
try
{
DragDrop.DoDragDrop(GetCompositeView(draggedViewElement), dataObject, DragDropEffects.Move | DragDropEffects.Copy | DragDropEffects.Scroll | DragDropEffects.Link);
}
catch
{
//let the caller handle exception
throw;
}
finally
{
view.EndDragShadowTracking(dragShadow);
draggedViewElement.IsHitTestVisible = true;
}
return GetDragDropCompletedEffects(dataObject);
}
public static bool AllowDrop(IDataObject draggedDataObject, EditingContext context, params Type[] allowedItemTypes)
{
if (draggedDataObject == null)
{
throw FxTrace.Exception.ArgumentNull("draggedDataObject");
}
if (context == null)
{
throw FxTrace.Exception.ArgumentNull("context");
}
if (allowedItemTypes == null)
{
throw FxTrace.Exception.ArgumentNull("allowedItemTypes");
}
ReadOnlyState readOnlyState = context.Items.GetValue<ReadOnlyState>();
if (readOnlyState != null && readOnlyState.IsReadOnly)
{
return false;
}
if (!AllowDrop(draggedDataObject, context))
{
return false;
}
List<Type> draggedTypes = GetDraggedTypes(draggedDataObject);
return draggedTypes != null
&& draggedTypes.Count != 0
&& draggedTypes.All<Type>((p) =>
{
for (int i = 0; i < allowedItemTypes.Length; ++i)
{
if (allowedItemTypes[i] == null)
{
throw FxTrace.Exception.ArgumentNull(string.Format(CultureInfo.InvariantCulture, "allowedItemTypes[{0}]", i));
}
if (AllowDrop(p, allowedItemTypes[i]))
{
return true;
}
}
return false;
});
}
static bool AllowDrop(IDataObject draggedDataObject, EditingContext context)
{
ModelItem droppedModelItem = draggedDataObject.GetData(ModelItemDataFormat) as ModelItem;
if (droppedModelItem == null)
{
return true;
}
return ((IModelTreeItem)droppedModelItem).ModelTreeManager.Context.Equals(context);
}
internal static bool AllowDrop(Type draggedType, Type allowedItemType)
{
if (draggedType == null)
{
// This is the case where some external stuff (e.g. Recycle bin) get dragged over.
return false;
}
// This is a special case in GetDroppedObject() and replicated here.
// Check whether dragged type is IActivityTemplateFactory, if true, use Factory's implement type instead.
Type factoryType;
if (draggedType.TryGetActivityTemplateFactory(out factoryType))
{
draggedType = factoryType;
}
if (allowedItemType.IsAssignableFrom(draggedType))
{
return true;
}
else if (allowedItemType.IsGenericTypeDefinition && draggedType.IsGenericType)
{
// We don't have inheritance relationship for GenericTypeDefinition, therefore the right check is equality
return allowedItemType.Equals(draggedType.GetGenericTypeDefinition());
}
else if (allowedItemType.IsGenericType && draggedType.IsGenericTypeDefinition)
{
// Allow GenericTypeDefinition to be dropped with GenericType constraint, if user select a correct argument type, drop should work.
return draggedType.Equals(allowedItemType.GetGenericTypeDefinition());
}
else if (allowedItemType.IsGenericType && draggedType.IsGenericType && draggedType.ContainsGenericParameters)
{
// If the draggedType is generic type but it contains generic parameters, which may happen to match the constraint.
return allowedItemType.GetGenericTypeDefinition() == draggedType.GetGenericTypeDefinition();
}
else
{
return false;
}
}
internal static List<Type> GetDraggedTypes(IDataObject draggedDataObject)
{
List<Type> types = new List<Type>();
if (draggedDataObject != null)
{
if (draggedDataObject.GetDataPresent(ModelItemsDataFormat))
{
IEnumerable<ModelItem> modelItems = draggedDataObject.GetData(ModelItemsDataFormat) as IEnumerable<ModelItem>;
foreach (ModelItem modelItem in modelItems)
{
if (modelItem != null)
{
types.Add(modelItem.ItemType);
}
}
}
else if (draggedDataObject.GetDataPresent(ModelItemDataFormat))
{
ModelItem modelItem = draggedDataObject.GetData(ModelItemDataFormat) as ModelItem;
if (modelItem != null)
{
types.Add(modelItem.ItemType);
}
}
// This is an object dragged from somewhere else other than from within the designer surface
if (draggedDataObject.GetDataPresent(WorkflowItemTypeNameFormat))
{
// This is the case where the object is dropped from the toolbox
string text = draggedDataObject.GetData(WorkflowItemTypeNameFormat) as string;
if (!string.IsNullOrEmpty(text))
{
types.Add(Type.GetType(text));
}
}
}
return types;
}
internal static bool IsDraggingFromToolbox(DragEventArgs e)
{
return e.Data.GetDataPresent(WorkflowItemTypeNameFormat);
}
public static IEnumerable<object> GetDroppedObjects(DependencyObject dropTarget, DragEventArgs e, EditingContext context)
{
List<object> droppedObjects = new List<object>();
if (e.Data.GetDataPresent(ModelItemsDataFormat))
{
IEnumerable<ModelItem> droppedModelItems = e.Data.GetData(ModelItemsDataFormat) as IEnumerable<ModelItem>;
foreach (ModelItem modelItem in droppedModelItems)
{
droppedObjects.Add(modelItem);
}
}
else
{
object droppedObject = e.Data.GetData(ModelItemDataFormat) as ModelItem;
// could have been dropped from toolbox.
if (droppedObject == null)
{
Type type = null;
if (e.Data.GetDataPresent(WorkflowItemTypeNameFormat))
{
string text = e.Data.GetData(WorkflowItemTypeNameFormat) as string;
if (!string.IsNullOrEmpty(text))
{
//try to use the text format to see if it holds a type name and try to create an object out of it.
type = Type.GetType(text);
}
}
droppedObject = GetDroppedObjectInstance(dropTarget, context, type, e.Data);
}
if (droppedObject != null)
{
droppedObjects.Add(droppedObject);
}
}
e.Handled = true;
context.Services.GetService<DesignerPerfEventProvider>().WorkflowDesignerDrop();
Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.ApplicationIdle,
new Action(() =>
{
context.Services.GetService<DesignerPerfEventProvider>().WorkflowDesignerIdleAfterDrop();
}));
return droppedObjects;
}
internal static void ValidateItemsAreOnView(IList<ModelItem> items, ICollection<ModelItem> modelItemsOnView)
{
Fx.Assert(items != null, "items");
Fx.Assert(modelItemsOnView != null, "modelItemsOnView");
for (int index = 0; index < items.Count; ++index)
{
if (!modelItemsOnView.Contains(items[index]))
{
throw FxTrace.Exception.AsError(
new ArgumentException(string.Format(CultureInfo.CurrentCulture, SR.Error_ItemNotOnView, index)));
}
}
}
[Obsolete("This method does not support dropping multiple items. Use \"public static IEnumerable<object> GetDroppedObjects(DependencyObject dropTarget, DragEventArgs e, EditingContext context)\" instead.")]
public static object GetDroppedObject(DependencyObject dropTarget, DragEventArgs e, EditingContext context)
{
IEnumerable<object> droppedObjects = GetDroppedObjects(dropTarget, e, context);
if (droppedObjects.Count() > 0)
{
return droppedObjects.First();
}
return null;
}
[SuppressMessage(FxCop.Category.Design, FxCop.Rule.DoNotCatchGeneralExceptionTypes,
Justification = "Any exception can be thrown from custom code. We don't want to crash VS.")]
[SuppressMessage("Reliability", "Reliability108",
Justification = "Any exception can be thrown from custom code. We don't want to crash VS.")]
internal static object GetDroppedObjectInstance(DependencyObject dropTarget, EditingContext context, Type type, IDataObject dataObject)
{
if (type != null)
{
//check if type is generic
if (type.IsGenericTypeDefinition)
{
type = ResolveGenericParameters(dropTarget, context, type);
}
}
object droppedObject = null;
if (null != type)
{
try
{
droppedObject = Activator.CreateInstance(type);
if (type.IsActivityTemplateFactory() && type.IsClass)
{
//find parent WorkflowViewElement - in case of mouse drop, current drop target most likely is ISourceContainer
if (!(dropTarget is WorkflowViewElement))
{
dropTarget = VisualTreeUtils.FindVisualAncestor<WorkflowViewElement>(dropTarget);
}
Type templateFactoryInterface2 = type.GetInterface(typeof(IActivityTemplateFactory<>).FullName);
if (templateFactoryInterface2 != null)
{
droppedObject = templateFactoryInterface2.InvokeMember("Create", BindingFlags.InvokeMethod, null, droppedObject, new object[] { dropTarget, dataObject }, CultureInfo.InvariantCulture);
}
else if (droppedObject is IActivityTemplateFactory)
{
droppedObject = ((IActivityTemplateFactory)droppedObject).Create(dropTarget);
}
}
// SQM: Log activity usage count
ActivityUsageCounter.ReportUsage(context.Services.GetService<IVSSqmService>(), type);
}
catch (Exception ex)
{
if (Fx.IsFatal(ex))
{
throw;
}
string details = ex.Message;
if (ex is TargetInvocationException && ex.InnerException != null)
{
details = ex.InnerException.Message;
}
ErrorReporting.ShowErrorMessage(string.Format(CultureInfo.CurrentUICulture, SR.CannotCreateInstance, TypeNameHelper.GetDisplayName(type, false)), details);
}
}
return droppedObject;
}
static Type ResolveGenericParameters(DependencyObject dropTarget, EditingContext context, Type type)
{
// look to see if there is a DefaultTypeArgumentAttribute on it
DefaultTypeArgumentAttribute typeArgumentAttribute = ExtensibilityAccessor.GetAttribute<DefaultTypeArgumentAttribute>(type);
if (typeArgumentAttribute != null && typeArgumentAttribute.Type != null)
{
type = type.MakeGenericType(typeArgumentAttribute.Type);
}
else //require user to resolve generic arguments
{
ActivityTypeResolver wnd = new ActivityTypeResolver();
if (null != context)
{
WindowHelperService service = context.Services.GetService<WindowHelperService>();
if (null != service)
{
service.TrySetWindowOwner(dropTarget, wnd);
}
}
TypeResolvingOptions dropTargetOptions = null;
TypeResolvingOptions activityTypeOptions = null;
//try to see if the container has any customization for type resolver
ICompositeView container = dropTarget as ICompositeView;
if (container != null)
{
dropTargetOptions = container.DroppingTypeResolvingOptions;
}
//try to see if the activity type in discourse has any customization for type resolver
TypeResolvingOptionsAttribute attr = WorkflowViewService.GetAttribute<TypeResolvingOptionsAttribute>(type);
if (attr != null)
{
activityTypeOptions = attr.TypeResolvingOptions;
}
//if both have type resolver, try to merge them
TypeResolvingOptions options = TypeResolvingOptions.Merge(dropTargetOptions, activityTypeOptions);
if (options != null)
{
wnd.Options = options;
}
wnd.Context = context;
wnd.EditedType = type;
wnd.Width = 340;
wnd.Height = 200;
type = (true == wnd.ShowDialog() ? wnd.ConcreteType : null);
}
return type;
}
[Obsolete("This method does not support dragging multiple items. Use \"public static IEnumerable<ModelItem> GetDraggedModelItems(DragEventArgs e)\" instead.")]
public static ModelItem GetDraggedModelItem(DragEventArgs e)
{
return GetDraggedModelItemInternal(e);
}
internal static ModelItem GetDraggedModelItemInternal(DragEventArgs e)
{
IEnumerable<ModelItem> draggedModelItems = GetDraggedModelItems(e);
if (draggedModelItems.Count() > 0)
{
return draggedModelItems.First();
}
return null;
}
public static IEnumerable<ModelItem> GetDraggedModelItems(DragEventArgs e)
{
IEnumerable<ModelItem> draggedModelItems = e.Data.GetData(ModelItemsDataFormat) as IEnumerable<ModelItem>;
if (draggedModelItems != null)
{
return draggedModelItems;
}
else
{
ModelItem draggedItem = e.Data.GetData(ModelItemDataFormat) as ModelItem;
if (draggedItem != null)
{
return new ModelItem[] { draggedItem };
}
}
return new ModelItem[] { };
}
internal static bool AreListsIdenticalExceptOrder<T>(IList<T> sourceList, IList<T> destinationList)
{
// User does not
// 1) introduce unseen object into the collection.
// 2) remove object from the collection.
// 3) introduce null in the collection.
// 4) return null
if (sourceList == null)
{
return destinationList == null;
}
if (destinationList == null)
{
return false;
}
if (sourceList.Count != destinationList.Count)
{
return false;
}
HashSet<T> checkingMap = new HashSet<T>();
// create set
foreach (T item in sourceList)
{
bool ret = checkingMap.Add(item);
// an internal error, the item in src should be identical.
Fx.Assert(ret, "item in source list is not identical?");
}
foreach (T item in destinationList)
{
if (!checkingMap.Remove(item))
{
return false;
}
}
return checkingMap.Count == 0;
}
// 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;
}
[Obsolete("This method does not support dragging multiple items. Use \"public static UIElement GetCompositeView(WorkflowViewElement workflowViewElement)\" instead.")]
public static ICompositeView GetCompositeView(DragEventArgs e)
{
return (ICompositeView)e.Data.GetData(CompositeViewFormat);
}
public static Point GetDragDropAnchorPoint(DragEventArgs e)
{
Point referencePoint;
if (e.Data.GetDataPresent(DragAnchorPointFormat))
{
referencePoint = (Point)e.Data.GetData(DragAnchorPointFormat);
}
else
{
referencePoint = new Point(-1, -1);
}
return referencePoint;
}
[Obsolete("This method does not support dragging multiple items. Consider using \"public static void SetDragDropMovedViewElements(DragEventArgs e, IEnumerable<WorkflowViewElement> movedViewElements)\" instead.")]
public static void SetDragDropCompletedEffects(DragEventArgs e, DragDropEffects completedEffects)
{
try
{
e.Data.SetData(CompletedEffectsFormat, completedEffects);
}
catch (InvalidOperationException exception)
{
Trace.WriteLine(exception.ToString());
}
}
[Obsolete("This method does not support dragging multiple items. Consider using \"public static IEnumerable<WorkflowViewElement> GetDragDropMovedViewElements(DataObject data)\" instead.")]
public static DragDropEffects GetDragDropCompletedEffects(DataObject data)
{
if (data == null)
{
throw FxTrace.Exception.ArgumentNull("data");
}
DragDropEffects completedEffects = DragDropEffects.None;
if (data.GetDataPresent(CompletedEffectsFormat))
{
completedEffects = (DragDropEffects)data.GetData(CompletedEffectsFormat);
}
return completedEffects;
}
internal static void SetDragDropMovedViewElements(DragEventArgs e, IEnumerable<WorkflowViewElement> movedViewElements)
{
if (e == null)
{
throw FxTrace.Exception.ArgumentNull("e");
}
if (movedViewElements == null)
{
throw FxTrace.Exception.ArgumentNull("movedViewElements");
}
try
{
e.Data.SetData(MovedViewElementsFormat, movedViewElements);
}
catch (InvalidOperationException exception)
{
Trace.WriteLine(exception.ToString());
}
}
internal static IEnumerable<WorkflowViewElement> GetDragDropMovedViewElements(DataObject data)
{
if (data == null)
{
throw FxTrace.Exception.ArgumentNull("data");
}
if (data.GetDataPresent(MovedViewElementsFormat))
{
return (IEnumerable<WorkflowViewElement>)data.GetData(MovedViewElementsFormat);
}
return null;
}
internal static int GetDraggedObjectCount(DragEventArgs e)
{
return GetDraggedTypes(e.Data).Count;
}
internal static Dictionary<WorkflowViewElement, Point> GetViewElementRelativeLocations(IEnumerable<WorkflowViewElement> viewElements)
{
DesignerView designerView = null;
Dictionary<WorkflowViewElement, Point> locations = new Dictionary<WorkflowViewElement, Point>();
Point topLeftPoint = new Point(double.PositiveInfinity, double.PositiveInfinity);
foreach (WorkflowViewElement viewElement in viewElements)
{
if (designerView == null)
{
designerView = viewElement.Context.Services.GetService<DesignerView>();
}
Point location = new Point(0, 0);
if (designerView.scrollableContent.IsAncestorOf(viewElement))
{
GeneralTransform transform = viewElement.TransformToAncestor(designerView.scrollableContent);
location = transform.Transform(new Point(0, 0));
}
if (location.X < topLeftPoint.X)
{
topLeftPoint.X = location.X;
}
if (location.Y < topLeftPoint.Y)
{
topLeftPoint.Y = location.Y;
}
locations.Add(viewElement, location);
}
foreach (WorkflowViewElement viewElement in viewElements)
{
locations[viewElement] = Vector.Add(new Vector(-topLeftPoint.X, -topLeftPoint.Y), locations[viewElement]);
}
return locations;
}
internal static Dictionary<WorkflowViewElement, Point> GetDraggedViewElementRelativeLocations(DragEventArgs e)
{
List<WorkflowViewElement> draggedViewElements = new List<WorkflowViewElement>();
if (e.Data.GetDataPresent(ModelItemsDataFormat))
{
IEnumerable<ModelItem> draggedModelItems = e.Data.GetData(ModelItemsDataFormat) as IEnumerable<ModelItem>;
if (draggedModelItems != null)
{
foreach (ModelItem draggedModelItem in draggedModelItems)
{
if (draggedModelItem != null && draggedModelItem.View != null)
{
draggedViewElements.Add((WorkflowViewElement)draggedModelItem.View);
}
}
}
}
else if (e.Data.GetDataPresent(ModelItemDataFormat))
{
ModelItem draggedModelItem = e.Data.GetData(ModelItemDataFormat) as ModelItem;
if (draggedModelItem != null && draggedModelItem.View != null)
{
draggedViewElements.Add((WorkflowViewElement)draggedModelItem.View);
}
}
return GetViewElementRelativeLocations(draggedViewElements);
}
// Get rid of descendant model items when both ancestor and descendant and ancestor model items are selected
internal static IEnumerable<ModelItem> GetModelItemsToDrag(IEnumerable<ModelItem> modelItems)
{
HashSet<ModelItem> modelItemsToDrag = new HashSet<ModelItem>();
foreach (ModelItem modelItem in modelItems)
{
HashSet<ModelItem> parentModelItems = CutCopyPasteHelper.GetSelectableParentModelItems(modelItem);
parentModelItems.IntersectWith(modelItems);
if (parentModelItems.Count == 0)
{
modelItemsToDrag.Add(modelItem);
}
}
return modelItemsToDrag;
}
internal sealed class ViewElementDragShadow : Adorner
{
Rectangle content;
double x;
double y;
double offsetX;
double offsetY;
double scaleFactor;
double width;
double height;
AdornerLayer layer;
public ViewElementDragShadow(UIElement owner, WorkflowViewElement viewElement, Point offset, double scaleFactor)
: base(owner)
{
Rect bounds = VisualTreeHelper.GetDescendantBounds(viewElement);
this.width = bounds.Width;
this.height = bounds.Height;
this.content = new Rectangle()
{
Width = this.width,
Height = this.height,
Fill = new VisualBrush(viewElement)
{
Opacity = 0.6
}
};
this.InitializeCommon(offset, scaleFactor);
}
public ViewElementDragShadow(UIElement owner, IEnumerable<WorkflowViewElement> viewElements, Point offset, double scaleFactor)
: base(owner)
{
Dictionary<WorkflowViewElement, Point> locations = DragDropHelper.GetViewElementRelativeLocations(viewElements);
Grid grid = new Grid();
foreach (WorkflowViewElement viewElement in viewElements)
{
Rect bounds = VisualTreeHelper.GetDescendantBounds(viewElement);
Rectangle rectangle = new Rectangle()
{
Width = bounds.Width,
Height = bounds.Height,
Fill = new VisualBrush(viewElement),
Margin = new Thickness(locations[viewElement].X, locations[viewElement].Y, 0, 0),
VerticalAlignment = VerticalAlignment.Top,
HorizontalAlignment = HorizontalAlignment.Left
};
grid.Children.Add(rectangle);
}
grid.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
this.width = grid.DesiredSize.Width;
this.height = grid.DesiredSize.Height;
this.content = new Rectangle()
{
Width = this.width,
Height = this.height,
Fill = new VisualBrush(grid)
{
Opacity = 0.6
}
};
this.InitializeCommon(offset, scaleFactor);
}
internal void UpdatePosition(double x, double y)
{
if (this.Visibility == Visibility.Hidden)
{
this.Visibility = Visibility.Visible;
}
double oldX = this.x;
double oldY = this.y;
this.x = x - this.offsetX;
this.y = y - this.offsetY;
if (oldX != this.x || oldY != this.y)
{
this.layer = this.Parent as AdornerLayer;
this.layer.Update(this.AdornedElement);
}
}
public override GeneralTransform GetDesiredTransform(GeneralTransform transform)
{
GeneralTransformGroup result = new GeneralTransformGroup();
result.Children.Add(new TranslateTransform(this.x, this.y));
result.Children.Add(new ScaleTransform(this.scaleFactor, this.scaleFactor, this.x, this.y));
return result;
}
protected override Visual GetVisualChild(int index)
{
return this.content;
}
protected override int VisualChildrenCount
{
get { return 1; }
}
protected override Size ArrangeOverride(Size finalSize)
{
this.content.Arrange(new Rect(this.content.DesiredSize));
System.Diagnostics.Debug.WriteLine("DragShadow.ArrangeOverride " + this.content.DesiredSize);
return this.content.DesiredSize;
}
protected override Size MeasureOverride(Size constraint)
{
this.content.Measure(constraint);
System.Diagnostics.Debug.WriteLine("DragShadow.MeasureOverride " + this.content.DesiredSize);
return this.content.DesiredSize;
}
private void InitializeCommon(Point offset, double scaleFactor)
{
this.offsetX = offset.X * scaleFactor;
this.offsetY = offset.Y * scaleFactor;
this.Visibility = Visibility.Hidden;
this.scaleFactor = scaleFactor;
}
}
}
}
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