private Image GeneratePreview(Graphics graphics)
{
if (this.previewedActivityImage == null)
{
ActivityDesigner previewDesigner = this.PreviewDesigner;
if ((previewDesigner != null) && (this.parentDesigner != null))
{
this.previewedActivityImage = previewDesigner.GetPreviewImage(graphics);
}
}
return(this.previewedActivityImage);
}
protected override void CreateDragFeedbackImages(IList <Activity> draggedActivities)
{
base.CreateDragFeedbackImages(draggedActivities);
List <Image> list = new List <Image>();
using (Graphics graphics = base.ParentView.CreateGraphics())
{
foreach (Activity activity in draggedActivities)
{
ActivityDesigner designer = ActivityDesigner.GetDesigner(activity);
if (designer == null)
{
designer = ActivityDesigner.CreateDesigner(base.ParentView, activity);
}
list.Add(designer.GetPreviewImage(graphics));
}
}
base.ParentView.InvalidateClientRectangle(Rectangle.Empty);
this.draggedDesignerImages = list;
}
protected override void CreateDragFeedbackImages(IList <Activity> draggedActivities)
{
base.CreateDragFeedbackImages(draggedActivities);
List <Image> imageList = new List <Image>();
using (Graphics graphics = ParentView.CreateGraphics())
{
foreach (Activity activity in draggedActivities)
{
ActivityDesigner previewDesigner = ActivityDesigner.GetDesigner(activity);
if (previewDesigner == null)
{
previewDesigner = ActivityDesigner.CreateDesigner(ParentView, activity);
}
imageList.Add(previewDesigner.GetPreviewImage(graphics));
}
}
//We create the designer images for designers associates with existing activities
ParentView.InvalidateClientRectangle(Rectangle.Empty);
this.draggedDesignerImages = imageList;
}