Hidden component

Replies to This Discussion

Permalink Reply by Anders Holden Deleuran on March 13, 2014 at 9:43am

For a Python component you can add this line of code:

ghenv.Component.Hidden = True

Edit: Just realized that you had already figured this out. Will keep the reply for future reference.

Permalink Reply by Richard Schaffranek on March 13, 2014 at 11:18am

Maybe I can rephrase this:

When I add a component to the document which of the two methods are called?

When I copy a component which of the two methods are called?

When I open a file which of the two methods are called?

Permalink Reply by David Rutten on March 13, 2014 at 12:27pm

It will be difficult to figure out whether a component was pasted, duplicated, merged from another document or whether it was created anew.

I'd recommend setting Hidden to False in the constructor and actually doing your own hidden (de)serialization:

Public Overrides Function Write(writer As GH_IO.Serialization.GH_IWriter) As Boolean
  Dim rc As Boolean = MyBase.Write(writer)
  writer.SetBoolean("CustomHidden", Hidden)
  Return rc
End Function
Public Overrides Function Read(reader As GH_IO.Serialization.GH_IReader) As Boolean
  Dim rc As Boolean = MyBase.Read(reader)
  If (reader.ItemExists("CustomHidden")) Then
    Hidden = reader.GetBoolean("CustomHidden")
  End If
  Return rc
End Function

--

David Rutten

david@mcneel.com

Permalink Reply by Richard Schaffranek on March 14, 2014 at 3:49am

That Worked, a further question regarding this topic. I am using the PreviewChange Sub to detect if the preview has change or not:

Private Sub PreviewChange(ByVal sender As Object, ByVal e As GH_ObjectChangedEventArgs)
  SetValue("hidden", Me.Hidden)
  ' If (e.Type = GH_ObjectEventType.Preview) Then
  Me.ExpireSolution(True)
  Me.ExpirePreview(True)
  ' End If
End Sub

which I controll thorugh: AddHandler Me.ObjectChanged, AddressOf PreviewChange

This works create if I change the preview through the object menu but when changing the preview status for multiple objects this doesn't force the component to recompute. How can I fix this?

Permalink Reply by David Rutten on March 14, 2014 at 4:21am

That's my bug I'm afraid, the event doesn't get raised in that case. Little you can do to fix that.

On the other hand, you certainly don't want to start a new solution+redraw for every object that has its Hidden flag changed. If you switch the preview off for 50 components at once, it's going to take a long time and look very messy as they -one by one- change and update the viewports.

Am I right in thinking that the problem here is that if the preview is switched ON, you may have to compute additional data? If so, I think the best way is to detect this inside RenderViewportWires (override that method) and if the component/parameter is drawing itself and you don't have the required data, expire your component at that time.

You still need to figure out how to not expire+recompute all your components serially, so basically it means expiring ALL your components that are now in a bad state and then starting a single new solution for all of them.

--

David Rutten

david@mcneel.com

Permalink Reply by Richard Schaffranek on March 14, 2014 at 4:33am

Will you fix the bug? 

I didn't put the calculation of the data into the RenderViewportWires because, as far as I understood this would be called again when I change the viewport? 

Permalink Reply by David Rutten on March 14, 2014 at 5:05am

That's true, you should be doing as little as possible inside RenderViewportXXX() methods as those methods are called for every redraw of ever viewport.

I've fixed the bug but I don't know when the next release will go out.

--

David Rutten

david@mcneel.com