Grasshopper Button Should I expire solution?

Grasshopper Developer
1

Hi,

I added a button to grasshopper component following @DavidRutten old posts.
When I click on it, it is not changing unless I press again somewhere on canvas. For this reason I added baseClass.ExpireSolution(true) line 45.
But I am wondering if this actually correct to expire the full component to change its preview?

Button
Button577×590 29.2 KB

2

If the graphics depends on the solved state then you have to expire solution, but if you only needs to redraw the graphics, I think this does that:
https://developer.rhino3d.com/api/grasshopper/html/M_Grasshopper_Kernel_GH_Attributes_1_ExpireLayout.htm

and I guess you have to call canvas.Refresh() or canvas.Invalidate() after that.

1 Like
3

It seems that this works:

            ExpireLayout();
            sender.Refresh();
            sender.Invalidate();

And after I change the state of the button I would like to rerun solve instance.
Where it is better to place expire solution in that case?

4

Use Invalidate() or Refresh(), not both. I would use Refresh().

I guess that expire solution schedule a new solution for when the current finish, so in that case doesn’t matter where you call it. I would put it in the button click event handler.

5

Thanks, you mean inside function:
RespondToMouseDown ?