Component mClick event

Replies to This Discussion

Permalink Reply by David Rutten on March 3, 2011 at 4:53am

Before I answer the question, you're building and renaming an exe, not a dll. Please switch your project to 'Class Library'.

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Rutten on March 3, 2011 at 5:06am

Mouse and Key events for objects on the Grasshopper canvas are handled by the Attributes of that object. Attributes also take care of display, layout, selection behaviour and tooltips. 

 

By default, all components create the same kind of attributes, namely Grasshopper.Kernel.Attributes.GH_ComponentAttributes.

 

If you want to respond to MouseDown, MouseMove, MouseUp and/or MouseDoubleClick events you'll need to write your own Attributes. Since you can derive from GH_ComponentAttributes this is not a big job:

 

Public Class ScanComponentAttributes

  Inherits Grasshopper.Kernel.Attributes.GH_ComponentAttributes

 

  Public Sub New(byval owner As ScanComponent)

    MyBase.New(owner)

  End Sub

 

  Public Overrides Function RespondToMouseDoubleClick( _

              ByVal sender As Grasshopper.GUI.Canvas.GH_Canvas, _

              ByVal e As Grasshopper.GUI.GH_CanvasMouseEvent) _

              As Grasshopper.GUI.Canvas.GH_ObjectResponse      

    If (ContentBox.Contains(e.CanvasLocation)) Then        

      Dim sc As ScanComponent = DirectCast(Owner, ScanComponent)

      sc.ExpireSolution(True)

       'Or show a dialog or do something else
      Return Grasshopper.GUI.Canvas.GH_ObjectResponse.Handled      

    End If

    Return Grasshopper.GUI.Canvas.GH_ObjectResponse.Ignore    

  End Function

End Class

 

All that's left at this point is to associate your Attributes with your Component. For that you have to override the CreateAttributes() method on your ScanComponent class:

 

Public Overrides Sub CreateAttributes()

  m_Attributes = New ScanComponentAttributes(Me)  

End Sub

 

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Jachym Pesek on March 3, 2011 at 6:32am

 

1) Fine, I set project like Class Library.

2)

Thanks for fast replay, but I have some problem with conversion to C#. How to rewrite  //?????

 

 

 

public class ScanComponentAttributes : Grasshopper.Kernel.Attributes.GH_ComponentAttributes
    {
        public ScanComponentAttributes(ScanComponent owner)
        {
 // ????????????????????????????
        }

        public override Grasshopper.GUI.Canvas.GH_ObjectResponse RespondToMouseDoubleClick(Grasshopper.GUI.Canvas.GH_Canvas sender, Grasshopper.GUI.GH_CanvasMouseEvent e)
        {
            if (ContentBox.Contains(e.CanvasLocation))
            {
                ScanComponent sc = // ????????????????????????????
                sc.ExpireSolution(true);
                return Grasshopper.GUI.Canvas.GH_ObjectResponse.Handled;
            }
            return Grasshopper.GUI.Canvas.GH_ObjectResponse.Ignore;
        }
    }

 

Thx David

Permalink Reply by David Rutten on March 3, 2011 at 6:59am

public ScanComponentAttributes(ScanComponent owner) : base(owner) {}

 

ScanComponent sc = Owner as ScanComponent;

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by David Rutten on March 3, 2011 at 7:01am

You could also have pasted my code into this webpage:

 

http://www.developerfusion.com/tools/convert/vb-to-csharp/

 

and got your answer :)

 

The difference btw. between:

ScanComponent sc = (ScanComponent)Owner;

and

ScanComponent sc = Owner as ScanComponent;

Is that the first will crash if Owner is not of type ScanComponent. The second approach will just leave sc null. But since this can never happen, it's academic.

 

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Jachym Pesek on March 3, 2011 at 7:15am

David, thanks so much, now it works perfect.

 

Best,

Jachym