Programmatically stop object selection

Rhino Developer
1

Hello,

I’d like to know if it is possible to stop object selection when using CRhinoGetObject. I mean, I know that to ask the user selecting an object I can use the following code:

CRhinoGetObject gc;
gc.SetCommandPrompt(L"Select Part to be deposed");
gc.SetGeometryFilter(CRhinoGetObject::mesh_object);
//gc.SetGeometryAttributeFilter(CRhinoGetObject::open_curve);
gc.EnableDeselectAllBeforePostSelect(false);
gc.GetObjects(1, 1);
if (gc.ObjectCount() != 1)
{
	// Nothing selected or too many object selected -> Error
	return 1;
}

However, I’d like to know how I could stop asking for section programmtaitcally. I’m asking this since I have an user interface where I have a button that must be clicked to select geometry, but I need also to give the possibility to stop selection (since I do not know how many objects the user will select and I’d like not to need pressing esc to stop selection). Thank you for your attention!

2

You can control how many object the user can or must select by passing the required values to CRhinoGetObject::GetObject.

For example, if the user must pick 4 objects, you’d do this:

int minimum_number = 4;
int maximum_number = 4;
gc.GetObjects(minimum_number, maximum_number);

Does this help?

– Dale

3

Thnk you for your answer Dale. Unfortunately that’s not what I was looking for. I’d like to start the selection with GetObjects set for example to 10000 as maximum number, to be sure the user can select a lot of objects. But I want to give the user the possibility to select as many objects as he likes and then stop the selection proessing a button (instead of esc or enter), for this reason I was wondering if there’s a way to stop the selection not pressing esc (or reaching the maximum limit of allowed objects) but pressing a button in a gui. Hope I’m clear, I can provide more details if needed

4

You can always have a button that runs RhinoApp.RunScript("_Enter", false); when clicked. That will effectively press Enter and end the currently active GetObjects.

5

Hi @g_v_c,

Something like this might work:

void CMyCancelButton::OnLButtonDown(UINT nFlags, CPoint point)
{
  CRhinoDoc* pDoc = RhinoApp().ActiveDoc();
  if (pDoc && pDoc->InGetObject())
    pDoc->RunScript(L"!", 0);
}

A more advanced way is to register a custom window message using Win32’s RegisterWindowMessage function. Then call CRhinoGetObject::AcceptCustomWindowsMessage and pass your custom window message. Your dialog box cancel button hander, when pressed would post the custom window message, which would be caught by your object getter.

CRhinoGet::PostCustomWindowsMessage(SampleModelessCancelPlugIn().WindowMessage(), 0, 0);

See this sample project for details.

SampleModelessCancel

– Dale