Add a slider with a given NickName to the Grasshopper Canvas.

add_slider.py

"""
Create a named number slider.
    Inputs:
        Name: Slider NickName.
        Add: Set to 'True' to create the slider.
"""

# Name component
ghenv.Component.Name = "Slider Creator"
ghenv.Component.NickName = 'Slider Creator'

# Thanks to Andrew Heumann for his help.

# Import libraries
import Grasshopper as gh
import System.Drawing as sd

comp = ghenv.Component
ghdoc = comp.OnPingDocument()
canvas = gh.Instances.ActiveCanvas

# The array accessor lets you pick where to place the slider
targetInput = comp.Params.Input[1]

# Define a function to expire this component
def expire_this(doc):
    comp.ExpireSolution(False)

# Create 'Add' toggle
if Add == True:
    # Create the slider
    Slider = gh.Kernel.Special.GH_NumberSlider()
    Slider.NickName = Name
    
    # Add the slider
    ghdoc.AddObject(Slider, False, ghdoc.ObjectCount + 1)
    
    # Set the slider location
    thisPivot = targetInput.Attributes.Pivot
    Slider.Attributes.Pivot =sd.PointF(thisPivot.X-200,thisPivot.Y-100)

# Recompute the component
if Add == False:
    ghdoc.ScheduleSolution(5, expire_this)