Insert output parameter automatically

Grasshopper
1

Hello,
There’s a way to add “output parameters” to list item component, in automatically way (for e.g. via slider component or something like that)?

listitem_parameters
listitem_parameters450×509 18.3 KB

Thank you

2

Yep

private void RunScript(object listItem, int n)
  {
    Grasshopper.Kernel.IGH_Component lItem = listItem as Grasshopper.Kernel.IGH_Component;

    int count = lItem.Params.Output.Count;

    if (n <= 0)
    {
      n = 1;
    }

    int paramdiff = count - n;

    for (int i = 0; i < paramdiff; i++)
    {
      lItem.Params.UnregisterOutputParameter(lItem.Params.Output[lItem.Params.Output.Count - 1]);

    }

    for (int i = 0; i < -paramdiff; i++)
    {
      Grasshopper.Kernel.Parameters.Param_GenericObject ighp = new Grasshopper.Kernel.Parameters.Param_GenericObject();
      ighp.Name = "Item +" + (count + i);
      ighp.NickName = "+" + (count + i);
      lItem.Params.RegisterOutputParam(ighp);
    }

    lItem.ExpireSolution(true);

  }

AutoListItem.gh (6.1 KB)

2 Likes
3

Thank you @magicteddy,
It works perfect!.
I would like to know if it is possible to generate an automatic panel component as well as the example below

automatically_panel_items
automatically_panel_items1191×482 51.5 KB

Thank you again

4

Hi again,

Yes, it’s possible. Problem is you can’t really control the position if there are already components in the way, and there is also a small bug when outputs are deleted - that may be solvable by deleting the wires… - Edit, ah it’s not. Scheduling solution could a way…

I think a better approach would be to build a custom component that you could call from the canvas using LI=X and that would instantiate a List Item with X outputs and X panels.

Like these funny things I made because I was tired of inserting the same groups of components :

private void RunScript(object listItem, int n)
  {
    Grasshopper.Kernel.IGH_Component lItem = listItem as Grasshopper.Kernel.IGH_Component;

    int count = lItem.Params.Output.Count;

    if (n <= 0)
    {
      n = 1;
    }

    int paramdiff = count - n;

    for (int i = 0; i < paramdiff; i++)
    {
      lItem.Params.UnregisterOutputParameter(lItem.Params.Output[lItem.Params.Output.Count - 1]);

    }

    for (int i = 0; i < -paramdiff; i++)
    {
      Grasshopper.Kernel.Parameters.Param_GenericObject ighp = new Grasshopper.Kernel.Parameters.Param_GenericObject();
      ighp.Name = "Item +" + (count + i);
      ighp.NickName = "+" + (count + i);
      lItem.Params.RegisterOutputParam(ighp);
    }

    lItem.ExpireSolution(true);
    lItem.Attributes.ExpireLayout();


    Grasshopper.Instances.ActiveCanvas.Refresh();

    for (int i = 0; i < lItem.Params.Output.Count; i++)
    {
      bool has_panel = false;
      IGH_Param ighp = lItem.Params.Output[i];
      foreach (IGH_DocumentObject ighdoc in ighp.Recipients)
      {
        if (ighdoc is Grasshopper.Kernel.Special.GH_Panel)
        {
          has_panel = true;
          break;
        }
      }

      //insert Panel
      if (!has_panel)
      {


        IGH_DocumentObject panel = Grasshopper.Instances.ComponentServer.EmitObject(Grasshopper.Kernel.Special.GH_Panel.PanelID);
        Grasshopper.Kernel.Special.GH_Panel Panel = panel as Grasshopper.Kernel.Special.GH_Panel;

        GrasshopperDocument.AddObject(Panel, false, GrasshopperDocument.ObjectCount);

        Panel.Attributes.Pivot = new System.Drawing.PointF(ighp.Attributes.Pivot.X + 100, ighp.Attributes.Pivot.Y - 25);
        Panel.Attributes.Bounds = new System.Drawing.RectangleF(ighp.Attributes.Pivot.X + 100, ighp.Attributes.Pivot.Y - 25, 100, 50);
        Panel.AddSource(ighp);
        //Panel.ExpireSolution(true);
        Panel.Attributes.ExpireLayout();
      }

    }

    Grasshopper.Instances.ActiveCanvas.Refresh();

  }

AutoListItem.gh (12.9 KB)

3 Likes
5

Hi @magicteddy,
thank you for your component! Do you think you can fix the bug when deleting items?
Thank you again