Hi, Slavcho

Before implementing the custom class RectanglesBehavior, you can drag the view at will in the diagram by holding down the left mouse button, but it won’t work after the implementation. What kind of modification is needed for RectanglesBehavior?

namespace AOI
{
    class RectanglesBehavior:DrawShapesBehavior
    {
        public RectanglesBehavior(Diagram diagram):base(diagram)
        {
        }

        public override InteractionState StartDraw(Point point)
        {
            Diagram.ModifierKeyActions.Control = ModifierKeyAction.None;
            if (Keyboard.Modifiers == ModifierKeys.Control)
            {
                //return new InteractionState(new ShapeNode(Diagram), null, MindFusion.Diagramming.Wpf.Action.Create);
                var node = new ShapeNode(Diagram);
                node.Brush = Brushes.Transparent;
                return new InteractionState(node, null, MindFusion.Diagramming.Wpf.Action.Create);
            }

            var selected = Diagram.ActiveItem as ShapeNode;
            if (selected!=null)
            {
                var handle = selected.HitTestHandle(point);
                if (handle != null)
                    return new InteractionState(selected, handle, MindFusion.Diagramming.Wpf.Action.Modify);
            }

            /*
           var rect = NearestRect(point);
           if (rect != null)
           {
                 var handlesStyle = rect.HandlesStyle;
                 rect.HandlesStyle = HandlesStyle.SquareHandles2;
                 var handle = rect.HitTestHandle(point);
                 rect.HandlesStyle = handlesStyle;
                 if (handle != null)
                       return new InteractionState(rect, handle, Action.Modify);
           }*/

            // return base.StartDraw(point);
            return null;
        }

           /*public override CursorHint SetMouseCursor(Point point, out bool startInteraction)
     {
           return base.SetMouseCursor(point, out startInteraction);
     }*/

           /*protected override void OnMouseUp(Point mousePosition, MindFusion.Diagramming.Wpf.MouseButton mouseButton)
           {
                 base.OnMouseUp(mousePosition, mouseButton);
           }*/


           DiagramNode NearestRect(Point point)
           {
                 DiagramNode nearest = null;
                 double minDist = double.MaxValue;
                 foreach (var node in Diagram.Nodes)
                 {
                       if (node.Locked)
                             continue;
                       var dist = DistToRect(point, node.Bounds);
                       if (dist < minDist)
                       {
                             minDist = dist;
                             nearest = node;
                       }
                 }
                 return nearest;
           }

        double DistToRect(Point point, Rect rect)
        {
            var v = new[]
            {
            new Point(rect.Left, rect.Top),
            new Point(rect.Right, rect.Top),
            new Point(rect.Right, rect.Bottom),
            new Point(rect.Left, rect.Bottom),
        };
            double minDist = double.MaxValue;
            for (var i = 0; i < 4; i++)
            {
                var v1 = v[i];
                var v2 = v[(i + 1) % 4];
                var dist = MindFusion.Utilities.DistToLineSegment(point, v1, v2);
                if (dist < minDist)
                    minDist = dist;
            }
            return minDist;
        }
    }

   
}

Best regards.

Hi, Slavcho

I put diagram.Behavior = Behavior.Pan; in the constructor of RectanglesBehavior or in the Window_Loaded of the MainWindow class, but nothing happens. At first, I set the Diagram property Behavior to "PanAndModify" in MainWindow.xaml. If RectanglesBehavior is not instantiated: diagram.CustomBehavior = new RectanglesBehavior(diagram); you can press and drag the left mouse button to move the view of the diagram normally, but Not after instantiating RectanglesBehavior. May I ask what caused it? How to solve it?

Best regards.

Thanks, Slavcho

I understand that when the border of ShapeNode is selected, it is switched to CustomBehavior, otherwise it is switched to Behavior, but I don't understand that there has been no assignment operation to the properties of CustomBehavior. How do I switch?

Is it necessary to import the dll of the wpfdiag_pan.zip compressed package to recognize the PanBehavior class?

Best regards.

Hi, Slavcho

I just tried to add all the dlls in the folder to the reference of the project, but the version conflict occurred during compilation. Which dlls should be added?

Best regards.

Thanks, Slavcho

I changed the reference path in the project property page to the location of the unzipped assembly wpfdiag_pan, but the result is still the same. I don’t know if it’s because I didn’t find this location: project / references / mindfusion? The result is still using the previous reference.

Best regards.

Thanks very mush, Slavcho

Yes, I have successfully implemented it according to the settings of TestDraw, but I don’t understand why all references except MindFusion itself and other references must be set to the property of "Use a specific version" not enabled, please ask this "Use specific version" What is the role of the "version" attribute?

Best regards.

Thanks very much, Slavcho

I finally got it.

Best regards.