topic Re: How do I set the initial value and also an updated value for a Python slider control? in Fusion API and Scripts Forum

How do I set the initial value and also an updated value for a Python slider control?

tim.collins29V9X — Sat, 16 Apr 2022 15:54:15 GMT

In my Python add-in I have an integer value that can be between 15 and 32 and the initial value is 22. I'd like to use a slider but it does not have an initial value.

def addIntegerSliderCommandInput(self, id: str, name: str, min: int, max: int, hasTwoSliders: bool) -> IntegerSliderCommandInput:

A spinner does have the initial value:

def addIntegerSpinnerCommandInput(self, id: str, name: str, min: int, max: int, spinStep: int, initialValue: int) -> IntegerSpinnerCommandInput:

How do I set the initial value for a slider? At present this works fine if and only if an acceptable initial value is 0, which in my case is never true. Very often the initial value will be computed based on some other dependent variables and I will need to update the "initial" value inside the change handler. Is there some sample code with this in it?

Re: How do I set the initial value and also an updated value for a Python slider control?

kandennti — Sun, 17 Apr 2022 13:14:53 GMT

Hi @tim.collins29V9X .

After creating an instance, the valueOne property can be set.

https://help.autodesk.com/view/fusion360/ENU/?guid=GUID-0f49349e-5ad6-4386-9d78-91da5387e82e

# Fusion360API Python script import traceback import adsk.fusion import adsk.core _app: adsk.core.Application = None _ui: adsk.core.UserInterface = None _handlers = [] class MyCommandCreatedHandler(adsk.core.CommandCreatedEventHandler): def __init__(self): super().__init__() def notify(self, args: adsk.core.CommandCreatedEventArgs): adsk.core.Application.get().log(args.firingEvent.name) try: global _handlers cmd: adsk.core.Command = adsk.core.Command.cast(args.command) inputs: adsk.core.CommandInputs = cmd.commandInputs onDestroy = MyCommandDestroyHandler() cmd.destroy.add(onDestroy) _handlers.append(onDestroy) sliderIpt: adsk.core.IntegerSliderCommandInput = inputs.addIntegerSliderCommandInput( 'sliderId', 'test', 15, 32, False ) sliderIpt.valueOne = 22 except: _ui.messageBox('Failed:\n{}'.format(traceback.format_exc())) class MyCommandDestroyHandler(adsk.core.CommandEventHandler): def __init__(self): super().__init__() def notify(self, args: adsk.core.CommandEventArgs): adsk.core.Application.get().log(args.firingEvent.name) adsk.terminate() def run(context): try: global _app, _ui _app = adsk.core.Application.get() _ui = _app.userInterface cmdDef: adsk.core.CommandDefinition = _ui.commandDefinitions.itemById( 'test_cmd' ) if not cmdDef: cmdDef = _ui.commandDefinitions.addButtonDefinition( 'test_cmd', 'Test', 'Test' ) global _handlers onCommandCreated = MyCommandCreatedHandler() cmdDef.commandCreated.add(onCommandCreated) _handlers.append(onCommandCreated) cmdDef.execute() adsk.autoTerminate(False) except: if _ui: _ui.messageBox('Failed:\n{}'.format(traceback.format_exc()))

Re: How do I set the initial value and also an updated value for a Python slider control?

tim.collins29V9X — Wed, 20 Apr 2022 14:36:23 GMT

Thanks. My experience as mainly a C++/Java/C# developer gets me in trouble with Python-style coding! This also applies to change events where it seems you have to test for the type of the event sender to know if .value or .valueOne is of intereset.

Re: How do I set the initial value and also an updated value for a Python slider control?

tim.collins29V9X — Wed, 20 Apr 2022 18:42:59 GMT

To be more specific why is there both "CommandCreatedEventArgs" and also "CommandCreatedEvent"? Why does the API talk about passing in the "args" object (which is how Python handles variable length arguments) when the event is always a single argument? Why does one ever "cast()" -- ever? I have about a hundred questions along these lines but I think I need to stop here. Anyone?