I turned on the allowinsert property for the source and destination goviews.
IN all situations the dragdropeffects is set to copy or all.
there is no override of GoView.DoExternalDrag that is setting the DragEventArgs.Effect property.
One thing interesting is it the drag drop copy works in some cases(cases where I have programmatically created the source subgraphs without user initiated dorubberbanding) and it does not work in the user initiated sub graph creation cases.
In the cases it works the my subclass (of goSubgraph) cancopy and copyObject overrides are getting called. But in cases where it does not work, these overrides are not getting called.
see my derived subgraph below
using System;
using Northwoods.Go;
using HMS.Model;
using System.Windows.Forms;
using HMS.ConfigurationManagement.ComponentConfiguration;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace HMS.Presentation
{
///
/// Summary description for HmsSubGraph.
///
[Serializable]
public class HmsSubGraph : GoSubGraph
{
public GoRectangle fillRectangle;
SizeF marginSize = new SizeF( 20, 20 );
float[] customDashPattern = new float[] {9,2};
public static bool eventBypass = true;
public SizeF preferredSize;
private string instanceName;
private string unsavedInstanceName;
public AtomNode atomNode;
#region Constructors
public HmsSubGraph( String typeName,
String instanceName,
Component userObject,
PointF location,
SizeF size) : base()
{
this.InstanceName = instanceName;
this.preferredSize = size;
this.Location= location;
Pen pen = new Pen(Color.FromArgb( 0,0,0 ), 1 );
this.BorderPen = pen;
this.Collapsible = true;
this.Movable = true;
this.Selectable = true;
this.Handle.Position = new System.Drawing.PointF(this.Position.X-4, this.Position.Y-4);
this.PickableBackground = true;
this.addMargin();
// Create the CollapsedObject for the HmsSubGraph...
atomNode = new AtomNode( 7, typeName, instanceName, userObject );
//atomNode.UserObject = userObject;
this.UserObject = userObject;
this.CollapsedObject = atomNode;
atomNode.Selectable = false;
//////////////////////////////////////////////////////////////////
this.Label.AddObserver(this);
this.Label.Alignment = GoText.TopCenter;
this.Label.StringTrimming = StringTrimming.EllipsisCharacter;
this.Label.AutoResizes = false;
this.Label.Clipping = true;
this.Label.Multiline = false;
this.Label.Wrapping = false;
this.Label.Width = 150;
this.Label.Editable = false;
this.Label.Copyable = true;
if ( ! userObject.IsInstantiated )
{
layoutAuthoringSubgraph();
}
this.Copyable = true;
setAppearance();
this.LayoutPort();
}
#endregion
#region Properties
public string InstanceName
{
get
{
return instanceName;
}
set
{
instanceName = value;
unsavedInstanceName = "" + value;
}
}
public string UnsavedInstanceName
{
get
{
return unsavedInstanceName;
}
}
#endregion
#region Methods
public void setAppearance()
{
if ( ((Component)this.UserObject).IsInstantiated )
{
this.BorderPen.DashStyle = DashStyle.Solid;
}
else
{
this.BorderPen.DashStyle = DashStyle.Custom;
this.BorderPen.DashPattern = customDashPattern;
}
if ( ((Component)this.UserObject).IsSaved )
{
this.Label.Text = this.instanceName;
}
else
{
this.Label.Text = this.unsavedInstanceName;
}
this.atomNode.setAppearance( Color.Empty, this.BorderPen.DashStyle );
}
private void layoutAuthoringSubgraph()
{
this.fillRectangle = new GoRectangle();
this.fillRectangle.Size =
new SizeF( preferredSize.Width - (marginSize.Width2),
preferredSize.Height - this.Label.Height - (marginSize.Height2) );
this.fillRectangle.Selectable = false;
this.fillRectangle.Visible = false;
// These location offsets are a function of the label size…
PointF loc = new PointF(Location.X-40, Location.Y+80);
this.fillRectangle.Location = loc;
this.fillRectangle.Copyable = true;
this.addMargin();
this.Add(this.fillRectangle);
}
public void addMargin()
{
this.TopLeftMargin = this.marginSize;
this.BottomRightMargin = this.marginSize;
}
public override void Collapse()
{
base.Collapse ();
this.Handle.Position = new System.Drawing.PointF(this.Position.X+4, this.Position.Y+4);
PointF loc = new PointF( this.Location.X - 4, this.Location.Y - 4 );
this.Position = loc;
this.Label.Visible = false;
}
public override void Expand()
{
base.Expand ();
this.LayoutPort();
this.Label.Visible = true;
if ( ! ((Component)UserObject).IsInstantiated )
{
this.fillRectangle.Visible = false;
}
}
public override void DoResize(GoView view, RectangleF origRect, PointF newPoint, int whichHandle, GoInputState evttype, SizeF min, SizeF max)
{
RectangleF newRect = ComputeResize(origRect, newPoint, whichHandle, min, max, true);
if ( evttype == GoInputState.Finish )
{
this.fillRectangle.Width = newRect.Width - marginSize.Width2;
this.fillRectangle.Height = newRect.Height - this.Label.Height - marginSize.Height*2;
PointF location =
new PointF( newRect.Location.X + marginSize.Width,
newRect.Location.Y + this.Label.Height + marginSize.Height );
this.fillRectangle.Location = location;
this.fillRectangle.Visible = false;
}
}
public override bool CanCopy()
{
bool retVal = base.CanCopy ();
return retVal;
}
public override GoObject CopyObject(GoCopyDictionary env)
{
return base.CopyObject (env);
}
///
/// this method is overloaded when components are created during authoring. It is important
/// to register the parent child relationships of the component objects during this action.
/// this override performs just that.
///
///
///
///
public override IGoCollection AddCollection(IGoCollection coll, bool reparentLinks)
{
Component thisComponent = (Component)this.UserObject;
Component childComponent = null;
foreach (GoObject childComponentView in coll)
{
if(childComponentView is HmsSubGraph)
{
childComponent = (Component)((HmsSubGraph)childComponentView).UserObject;
}
if(childComponentView is AtomNode)
{
childComponent = (Component)((AtomNode)childComponentView).UserObject;
}
thisComponent.addChild(childComponent);
}
return base.AddCollection (coll, reparentLinks);
}
public override bool OnContextClick( GoInputEventArgs evt, GoView view )
{
/** If a menu exists for a clicked component, display it.
/
GoContextMenu menu = ((Component)this.UserObject).getMenu( view );
if ( menu != null )
{
menu.Show( view, view.PointToClient(Control.MousePosition ));
}
return true;
}
protected override void OnObservedChanged(GoObject observed, int subhint, int oldI, object oldVal, RectangleF oldRect, int newI, object newVal, RectangleF newRect)
{
base.OnObservedChanged (observed, subhint, oldI, oldVal, oldRect, newI, newVal, newRect);
switch ( subhint )
{
case GoText.ChangedText:
atomNode.InstanceNameText.Text = newVal.ToString();
break;
}
}
#endregion
#region Events
#endregion
}
}
public virtual GoObject createDisplayableObject(GoView goView, PointF location, float height, float width)
{
string instanceNameString = null;
string typeNameString = null;
if ( this.InstanceName == null || this.InstanceName == String.Empty )
{
instanceNameString = "[new]";
}
else
{
instanceNameString = this.InstanceName;
}
if ( this.TypeName == null || this.TypeName == String.Empty )
{
typeNameString = "[type]";
}
else
{
typeNameString = this.TypeName;
}
HmsSubGraph = new HmsSubGraph(typeNameString, instanceNameString, this, location, new SizeF(width, height));
HmsSubGraph.AddCollection(goView.Selection, false);
goView.Document.Add(HmsSubGraph);
HmsSubGraph.Collapse();
HmsSubGraph.Expand();
if ( ! this.isInstantiated )
{
HmsSubGraph.Resizable = true;
HmsSubGraph.Selectable = true;
}
return this.goObject;
}
