How can I dynamically update a list of options in a Python code or Python result?

Pierre Thieffry

I want a list of options to be actuated based on its content. Let say I am showing a list of coordinate systems to choose from. How can I make sure the list of options is the actual list of available CS?

Pierre Thieffry

Here's a solution, using 'GetOptionsCallback'. In the property provider, you define your option property like this:

options_prop = group.AddProperty("Coordinate systems", Control.Options)
options_prop.GetOptionsCallback= get_options_handler

Then you add this definition to the main script:

def get_options_handler(prop):
    opt = {}
    num_opt=1
    for comp in ExtAPI.DataModel.GetObjectsByType(DataModelObjectCategory.CoordinateSystem):
        opt[num_opt] = comp.Name
        num_opt+=1
    return opt

James Derrick

Can you add a code-snippet example of what you mean?

Rohith Patchigolla

Building on the script Pierre T provided, I modified it further to remove the small caveat (when you delete the system that is currently picked in the Python code, it will not invalidate it and show a number instead of the CS name.) associated with the previous solution.

In the property provider, you define your option property like this: In addition to using 'GetOptionsCallback', we would need to use 'IsValidCallback' as well.

options_prop = group.AddProperty("Coordinate systems", Control.Options)
options_prop.GetOptionsCallback= get_options_handler
options_prop.IsValidCallback = dropDownValid

Then you add these two function definitions to the main script:

def get_options_handler(prop):
    global opt
    try:
        numOptions_beforeRefresh = len(opt)
    except:
        ExtAPI.Log.WriteMessage("Opt is not yet defined")
    opt = {}
    num_opt=1
    for comp in ExtAPI.DataModel.GetObjectsByType(DataModelObjectCategory.CoordinateSystem):
        opt[num_opt] = comp.Name
        num_opt+=1
    if prop.Value != None:
        if str(prop.Value) > str(len(opt)):
            prop.Value = None
    if "numOptions_beforeRefresh" in locals():
        if numOptions_beforeRefresh > len(opt):
            prop.Value = None
            
    return opt
    
def dropDownValid(prop):
    if prop.Value==None:
        return False
    elif prop.ValueString.isnumeric() == True:
        return False
    else:
        return True