void gViewer_ObjectUnderMouseCursorChanged(object sender, ObjectUnderMouseCursorChangedEventArgs e)
{
selectedObject = e.OldObject != null ? e.OldObject.DrawingObject : null;
if (selectedObject != null)
{
RestoreSelectedObjAttr();
gViewer.Invalidate(e.OldObject);
selectedObject = null;
}
if (gViewer.SelectedObject == null)
{
infoLabel.Text = "No object under the mouse";
gViewer.SetToolTip(toolTip, "");
}
else
{
selectedObject = gViewer.SelectedObject;
var edge = selectedObject as Edge;
if (edge != null)
{
selectedObjectAttr = edge.Attr.Clone();
edge.Attr.Color = Color.Blue;
gViewer.Invalidate(e.NewObject);
// here we can use e.Attr.Id or e.UserData to get back to the user data
gViewer.SetToolTip(toolTip, String.Format("edge from {0} to {1}", edge.Source, edge.Target));
}
else if (selectedObject is Microsoft.Msagl.Drawing.Node)
{
selectedObjectAttr = (gViewer.SelectedObject as Microsoft.Msagl.Drawing.Node).Attr.Clone();
(selectedObject as Microsoft.Msagl.Drawing.Node).Attr.Color = Color.Green;
// // here you can use e.Attr.Id to get back to your data
gViewer.SetToolTip(toolTip,
String.Format("node {0}",
(selectedObject as Microsoft.Msagl.Drawing.Node).Attr.Id));
gViewer.Invalidate(e.NewObject);
}
infoLabel.Text = selectedObject.ToString();
}
}
private void Gviewer_ObjectUnderMouseCursorChanged(object sender, ObjectUnderMouseCursorChangedEventArgs e)
{
RestorePreviouslyHoverObjectColor(e.OldObject);
if (e.OldObject != null)
{
gviewer.Invalidate(e.OldObject);
}
if (gviewer.ObjectUnderMouseCursor == null)
{
gviewer.SetToolTip(viewerToolTip, "");
return;
}
selectedObjectMouseHover = gviewer.ObjectUnderMouseCursor;
DrawingObject currentDrawingObject = selectedObjectMouseHover.DrawingObject;
string selectedObjetLabel = null;
if (currentDrawingObject is Edge)
{
var edge = currentDrawingObject as Edge;
edge.Attr.Color = Color.Blue;
selectedObjetLabel = edge.Attr.Id; // Attr.Id holds the relationship information
}
else if (currentDrawingObject is Node)
{
var node = currentDrawingObject as Node;
node.Attr.Color = Color.Green;
string entityName = node.Attr.Id;
selectedObjetLabel = entityRelations.GetEREntitieAttributesByEntityName(entityName)?.FirstOrDefault <EREntityAttribute>()?.Description;
}
else
{
return;
}
gviewer.SetToolTip(viewerToolTip, selectedObjetLabel);
if (e.NewObject != null)
{
gviewer.Invalidate(e.NewObject);
}
}