protected virtual void CreateDragFeedbackImages(IList <Activity> draggedActivities)
{
Bitmap draggedImage = null;
if (draggedActivities.Count > 0)
{
Bitmap image = null;
String description = String.Empty;
if (draggedActivities.Count > 1)
{
image = DR.GetImage(DR.Activities) as Bitmap;
description = DR.GetString(DR.ActivitiesDesc);
}
else
{
ToolboxBitmapAttribute toolboxBitmapAttribute = (ToolboxBitmapAttribute)TypeDescriptor.GetAttributes(draggedActivities[0].GetType())[typeof(ToolboxBitmapAttribute)];
image = toolboxBitmapAttribute.GetImage(draggedActivities[0].GetType()) as Bitmap;
description = draggedActivities[0].GetType().Name;
}
if (image != null && description.Length > 0)
{
//Start creating a bitmap
WorkflowView parentView = ParentView;
Rectangle imageRectangle = (image != null) ? new Rectangle(Point.Empty, image.Size) : Rectangle.Empty;
Rectangle descriptionRectangle = (description.Length > 0) ? new Rectangle(Point.Empty, new Size(AmbientTheme.DragImageTextSize.Width, parentView.Font.Height + 2)) : Rectangle.Empty;
if (!imageRectangle.IsEmpty)
{
descriptionRectangle.Offset(imageRectangle.Width + AmbientTheme.DragImageMargins.Width, 0);
}
Size draggedImageSize = parentView.LogicalSizeToClient(new Size(imageRectangle.Width + descriptionRectangle.Width, Math.Max(imageRectangle.Height, descriptionRectangle.Height)));
draggedImage = new Bitmap(draggedImageSize.Width, draggedImageSize.Height, PixelFormat.Format32bppArgb);
using (Graphics draggedImageGraphics = Graphics.FromImage(draggedImage))
using (Brush backgroundBrush = new SolidBrush(Color.FromArgb(0, 255, 0, 255)))
{
draggedImageGraphics.ScaleTransform(ScaleZoomFactor, ScaleZoomFactor);
draggedImageGraphics.FillRectangle(backgroundBrush, new Rectangle(0, 0, draggedImage.Width, draggedImage.Height));
if (image != null)
{
draggedImageGraphics.DrawImage(image, new Rectangle(Point.Empty, image.Size));
}
if (description.Length > 0)
{
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Near;
stringFormat.Trimming = StringTrimming.EllipsisCharacter;
stringFormat.LineAlignment = StringAlignment.Center;
draggedImageGraphics.DrawString(description, parentView.Font, SystemBrushes.WindowText, descriptionRectangle, stringFormat);
}
}
}
}
this.dragImage = draggedImage;
}
protected virtual void CreateDragFeedbackImages(IList <Activity> draggedActivities)
{
Bitmap image = null;
if (draggedActivities.Count > 0)
{
Bitmap bitmap2 = null;
string s = string.Empty;
if (draggedActivities.Count > 1)
{
bitmap2 = DR.GetImage("Activities") as Bitmap;
s = DR.GetString("ActivitiesDesc", new object[0]);
}
else
{
ToolboxBitmapAttribute attribute = (ToolboxBitmapAttribute)TypeDescriptor.GetAttributes(draggedActivities[0].GetType())[typeof(ToolboxBitmapAttribute)];
bitmap2 = attribute.GetImage(draggedActivities[0].GetType()) as Bitmap;
s = draggedActivities[0].GetType().Name;
}
if ((bitmap2 != null) && (s.Length > 0))
{
WorkflowView parentView = base.ParentView;
Rectangle rectangle = (bitmap2 != null) ? new Rectangle(Point.Empty, bitmap2.Size) : Rectangle.Empty;
Rectangle layoutRectangle = (s.Length > 0) ? new Rectangle(Point.Empty, new Size(AmbientTheme.DragImageTextSize.Width, parentView.Font.Height + 2)) : Rectangle.Empty;
if (!rectangle.IsEmpty)
{
layoutRectangle.Offset(rectangle.Width + AmbientTheme.DragImageMargins.Width, 0);
}
Size size = parentView.LogicalSizeToClient(new Size(rectangle.Width + layoutRectangle.Width, Math.Max(rectangle.Height, layoutRectangle.Height)));
image = new Bitmap(size.Width, size.Height, PixelFormat.Format32bppArgb);
using (Graphics graphics = Graphics.FromImage(image))
{
using (Brush brush = new SolidBrush(Color.FromArgb(0, 0xff, 0, 0xff)))
{
graphics.ScaleTransform(this.ScaleZoomFactor, this.ScaleZoomFactor);
graphics.FillRectangle(brush, new Rectangle(0, 0, image.Width, image.Height));
if (bitmap2 != null)
{
graphics.DrawImage(bitmap2, new Rectangle(Point.Empty, bitmap2.Size));
}
if (s.Length > 0)
{
StringFormat format = new StringFormat {
Alignment = StringAlignment.Near,
Trimming = StringTrimming.EllipsisCharacter,
LineAlignment = StringAlignment.Center
};
graphics.DrawString(s, parentView.Font, SystemBrushes.WindowText, layoutRectangle, format);
}
}
}
}
}
this.dragImage = image;
}
protected override bool OnDragOver(DragEventArgs eventArgs)
{
//By default we do not allow any drag drop operation
eventArgs.Effect = DragDropEffects.None;
this.wasCtrlKeyPressed = false;
this.dragImageSnapped = false;
//Get the coordinates
WorkflowView parentView = ParentView;
Point clientPoint = parentView.PointToClient(new Point(eventArgs.X, eventArgs.Y));
Point logicalPoint = parentView.ScreenPointToLogical(new Point(eventArgs.X, eventArgs.Y));
//Update the drag image position
Point oldDragImagePoint = this.dragImagePointInClientCoOrd;
this.dragImagePointInClientCoOrd = new Point(clientPoint.X + SystemInformation.CursorSize.Width / 4, clientPoint.Y + SystemInformation.CursorSize.Height / 4);
//Now check if the drag point is in active layout if not then clear the designer
if (!parentView.IsClientPointInActiveLayout(clientPoint))
{
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragLeave();
}
this.dropTargetDesigner = null;
}
else
{
//Now we have a potential for successful drag drop, so construct drag event arguments with logical coordinates
this.wasCtrlKeyPressed = ((eventArgs.KeyState & 8) == 8);
ActivityDragEventArgs dragdropEventArgs = new ActivityDragEventArgs(eventArgs, this.dragInitiationPoint, logicalPoint, this.draggedActivities);
//Now check which designer is under the cursor, if there is no designer then we return
HitTestInfo hitTestInfo = MessageHitTestContext;
ActivityDesigner potentialDropTargetDesigner = hitTestInfo.AssociatedDesigner;
if (potentialDropTargetDesigner != null)
{
CompositeActivityDesigner compositeDesigner = potentialDropTargetDesigner as CompositeActivityDesigner;
if ((!this.wasCtrlKeyPressed && IsRecursiveDropOperation(potentialDropTargetDesigner)) ||
(compositeDesigner != null && !compositeDesigner.IsEditable))
{
dragdropEventArgs.Effect = DragDropEffects.None;
potentialDropTargetDesigner = null;
}
}
//If the designers differ then send appropriate messages
if (this.dropTargetDesigner != potentialDropTargetDesigner)
{
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragLeave();
}
this.dropTargetDesigner = potentialDropTargetDesigner;
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragEnter(dragdropEventArgs);
}
}
else
{
//Looks like we got the same designer
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragOver(dragdropEventArgs);
}
//Check if there is a potential for the drag image to be snapped
if (DragDropEffects.None != dragdropEventArgs.Effect && !dragdropEventArgs.DragImageSnapPoint.IsEmpty)
{
Point midPointInClientCoOrd = parentView.LogicalPointToClient(dragdropEventArgs.DragImageSnapPoint);
Size dragImageIconSize = parentView.LogicalSizeToClient(AmbientTheme.DragImageIconSize);
this.dragImagePointInClientCoOrd = new Point(midPointInClientCoOrd.X - dragImageIconSize.Width / 2, midPointInClientCoOrd.Y - dragImageIconSize.Height / 2);
this.dragImageSnapped = true;
}
}
eventArgs.Effect = dragdropEventArgs.Effect;
}
//
if (this.dragImage != null)
{
parentView.InvalidateClientRectangle(new Rectangle(oldDragImagePoint, this.dragImage.Size));
parentView.InvalidateClientRectangle(new Rectangle(this.dragImagePointInClientCoOrd, this.dragImage.Size));
}
if (eventArgs.Effect == DragDropEffects.None && this.exceptionInDragDrop)
{
eventArgs.Effect = (this.wasCtrlKeyPressed) ? DragDropEffects.Copy : DragDropEffects.Move;
}
return(true);
}
protected override bool OnDragEnter(DragEventArgs eventArgs)
{
//We purposely pass the DragEnter thru to the next behavior so that the WindowingBehavior can clear the
//active designer
Debug.Assert(this.dropTargetDesigner == null);
//Invalidate the entire rectangle so that we draw active placement glyphs on connectors
WorkflowView parentView = ParentView;
parentView.InvalidateClientRectangle(Rectangle.Empty);
//By default we do not allow any drag drop operation
eventArgs.Effect = DragDropEffects.None;
this.wasCtrlKeyPressed = false;
//Now cache the components which are getting dragged so that we don't need to create them again and again
if (this.existingDraggedActivities.Count > 0)
{
this.draggedActivities.AddRange(this.existingDraggedActivities);
}
else
{
try
{
Activity[] activities = CompositeActivityDesigner.DeserializeActivitiesFromDataObject(ParentView, eventArgs.Data);
if (activities != null)
{
this.draggedActivities.AddRange(activities);
}
}
catch
{
this.exceptionInDragDrop = true;
}
}
//Get the coordinates
Point clientPoint = parentView.PointToClient(new Point(eventArgs.X, eventArgs.Y));
Point logicalPoint = parentView.ScreenPointToLogical(new Point(eventArgs.X, eventArgs.Y));
//Now try to create the drag image and invalidate the area so that we can draw the dragged image
Debug.Assert(this.dragImage == null);
CreateDragFeedbackImages(this.draggedActivities);
if (this.dragImage != null)
{
this.dragImagePointInClientCoOrd = new Point(clientPoint.X + SystemInformation.CursorSize.Width / 4, clientPoint.Y + SystemInformation.CursorSize.Height / 4);
}
//If the hit is not in the layouts then we need to bail out, this is very important
if (!parentView.IsClientPointInActiveLayout(clientPoint))
{
return(false);
}
//Now we have a potential for successful drag drop, so construct drag event arguments with logical coordinates
this.wasCtrlKeyPressed = ((eventArgs.KeyState & 8) == 8);
ActivityDragEventArgs dragdropEventArgs = new ActivityDragEventArgs(eventArgs, this.dragInitiationPoint, logicalPoint, this.draggedActivities);
//Now check which designer is under the cursor, if there is no designer then we return
HitTestInfo hitTestInfo = MessageHitTestContext;
ActivityDesigner potentialDropTargetDesigner = hitTestInfo.AssociatedDesigner;
if (potentialDropTargetDesigner == null)
{
return(false);
}
//Now that we found a potential droptarget designer, make sure that we can start drag drop
//If the drag drop can not be performed then return.
if (!this.wasCtrlKeyPressed && IsRecursiveDropOperation(potentialDropTargetDesigner))
{
return(false);
}
CompositeActivityDesigner compositeDesigner = potentialDropTargetDesigner as CompositeActivityDesigner;
if (compositeDesigner != null && !compositeDesigner.IsEditable)
{
return(false);
}
//Now that we can truely perform drag and drop operation we can pump in the message
this.dropTargetDesigner = potentialDropTargetDesigner;
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragEnter(dragdropEventArgs);
//Check the return value, if this is a potential snap location then we need to snap the image
if (!dragdropEventArgs.DragImageSnapPoint.IsEmpty)
{
Point midPointInClientCoOrd = parentView.LogicalPointToClient(dragdropEventArgs.DragImageSnapPoint);
Size dragImageIconSize = parentView.LogicalSizeToClient(AmbientTheme.DragImageIconSize);
this.dragImagePointInClientCoOrd = new Point(midPointInClientCoOrd.X - dragImageIconSize.Width / 2, midPointInClientCoOrd.Y - dragImageIconSize.Height / 2);
this.dragImageSnapped = true;
}
eventArgs.Effect = dragdropEventArgs.Effect;
if (eventArgs.Effect == DragDropEffects.None && this.exceptionInDragDrop)
{
eventArgs.Effect = (this.wasCtrlKeyPressed) ? DragDropEffects.Copy : DragDropEffects.Move;
}
return(true);
}
protected override bool OnDragOver(DragEventArgs eventArgs)
{
eventArgs.Effect = DragDropEffects.None;
this.wasCtrlKeyPressed = false;
this.dragImageSnapped = false;
WorkflowView parentView = base.ParentView;
Point clientPoint = parentView.PointToClient(new Point(eventArgs.X, eventArgs.Y));
Point point = parentView.ScreenPointToLogical(new Point(eventArgs.X, eventArgs.Y));
Point dragImagePointInClientCoOrd = this.dragImagePointInClientCoOrd;
this.dragImagePointInClientCoOrd = new Point(clientPoint.X + (SystemInformation.CursorSize.Width / 4), clientPoint.Y + (SystemInformation.CursorSize.Height / 4));
if (!parentView.IsClientPointInActiveLayout(clientPoint))
{
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragLeave();
}
this.dropTargetDesigner = null;
}
else
{
this.wasCtrlKeyPressed = (eventArgs.KeyState & 8) == 8;
ActivityDragEventArgs e = new ActivityDragEventArgs(eventArgs, this.dragInitiationPoint, point, this.draggedActivities);
ActivityDesigner associatedDesigner = base.MessageHitTestContext.AssociatedDesigner;
if (associatedDesigner != null)
{
CompositeActivityDesigner designer2 = associatedDesigner as CompositeActivityDesigner;
if ((!this.wasCtrlKeyPressed && this.IsRecursiveDropOperation(associatedDesigner)) || ((designer2 != null) && !designer2.IsEditable))
{
e.Effect = DragDropEffects.None;
associatedDesigner = null;
}
}
if (this.dropTargetDesigner != associatedDesigner)
{
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragLeave();
}
this.dropTargetDesigner = associatedDesigner;
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragEnter(e);
}
}
else
{
if (this.dropTargetDesigner != null)
{
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragOver(e);
}
if ((e.Effect != DragDropEffects.None) && !e.DragImageSnapPoint.IsEmpty)
{
Point point4 = parentView.LogicalPointToClient(e.DragImageSnapPoint);
Size size = parentView.LogicalSizeToClient(AmbientTheme.DragImageIconSize);
this.dragImagePointInClientCoOrd = new Point(point4.X - (size.Width / 2), point4.Y - (size.Height / 2));
this.dragImageSnapped = true;
}
}
eventArgs.Effect = e.Effect;
}
if (this.dragImage != null)
{
parentView.InvalidateClientRectangle(new Rectangle(dragImagePointInClientCoOrd, this.dragImage.Size));
parentView.InvalidateClientRectangle(new Rectangle(this.dragImagePointInClientCoOrd, this.dragImage.Size));
}
if ((eventArgs.Effect == DragDropEffects.None) && this.exceptionInDragDrop)
{
eventArgs.Effect = this.wasCtrlKeyPressed ? DragDropEffects.Copy : DragDropEffects.Move;
}
return(true);
}
protected override bool OnDragEnter(DragEventArgs eventArgs)
{
WorkflowView parentView = base.ParentView;
parentView.InvalidateClientRectangle(Rectangle.Empty);
eventArgs.Effect = DragDropEffects.None;
this.wasCtrlKeyPressed = false;
if (this.existingDraggedActivities.Count > 0)
{
this.draggedActivities.AddRange(this.existingDraggedActivities);
}
else
{
try
{
Activity[] collection = CompositeActivityDesigner.DeserializeActivitiesFromDataObject(base.ParentView, eventArgs.Data);
if (collection != null)
{
this.draggedActivities.AddRange(collection);
}
}
catch
{
this.exceptionInDragDrop = true;
}
}
Point clientPoint = parentView.PointToClient(new Point(eventArgs.X, eventArgs.Y));
Point point = parentView.ScreenPointToLogical(new Point(eventArgs.X, eventArgs.Y));
this.CreateDragFeedbackImages(this.draggedActivities);
if (this.dragImage != null)
{
this.dragImagePointInClientCoOrd = new Point(clientPoint.X + (SystemInformation.CursorSize.Width / 4), clientPoint.Y + (SystemInformation.CursorSize.Height / 4));
}
if (!parentView.IsClientPointInActiveLayout(clientPoint))
{
return(false);
}
this.wasCtrlKeyPressed = (eventArgs.KeyState & 8) == 8;
ActivityDragEventArgs e = new ActivityDragEventArgs(eventArgs, this.dragInitiationPoint, point, this.draggedActivities);
ActivityDesigner associatedDesigner = base.MessageHitTestContext.AssociatedDesigner;
if (associatedDesigner == null)
{
return(false);
}
if (!this.wasCtrlKeyPressed && this.IsRecursiveDropOperation(associatedDesigner))
{
return(false);
}
CompositeActivityDesigner designer2 = associatedDesigner as CompositeActivityDesigner;
if ((designer2 != null) && !designer2.IsEditable)
{
return(false);
}
this.dropTargetDesigner = associatedDesigner;
((IWorkflowDesignerMessageSink)this.dropTargetDesigner).OnDragEnter(e);
if (!e.DragImageSnapPoint.IsEmpty)
{
Point point3 = parentView.LogicalPointToClient(e.DragImageSnapPoint);
Size size = parentView.LogicalSizeToClient(AmbientTheme.DragImageIconSize);
this.dragImagePointInClientCoOrd = new Point(point3.X - (size.Width / 2), point3.Y - (size.Height / 2));
this.dragImageSnapped = true;
}
eventArgs.Effect = e.Effect;
if ((eventArgs.Effect == DragDropEffects.None) && this.exceptionInDragDrop)
{
eventArgs.Effect = this.wasCtrlKeyPressed ? DragDropEffects.Copy : DragDropEffects.Move;
}
return(true);
}