Arbitrary drop-down menu?

adamohern · April 2016

I want to include a list of standard sizes for a feature. How do I do that?

I see that the Extrude feature uses one for boundary type, but this appears to be a special case using globals. How do I assign arbitrary values to the dropdown menu items?

ilya_baran · April 2016

You can declare your own enum like this:

export enum Size
{
    annotation { "Name" : "Small" }
    SMALL,
    annotation { "Name" : "Medium" }
    MEDIUM,
    annotation { "Name" : "Large" }
    LARGE
}

annotation { "Feature Type Name" : "My Feature" }
export const myFeature = defineFeature(function(context is Context, id is Id, definition is map)
    precondition
    {
        annotation { "Name" : "Size" }
        definition.size is Size;
    }
    {
    }, { /* default parameters */ });

adamohern · April 2016

Thank, Ilya. I guess what's confusing me is the use of the globals, in your case SMALL, MEDIUM, and LARGE. Where do those get defined, and kind of data should they be?

adamohern · April 2016

Sorry, reading up on enum objects here, and I think I understand. It's a really strange construct as I understand it. Apparently the all-caps assignment is interpreted as a string, but is also accessible as if it were a map key. It's like a map where the keys and values are identical. I wonder why it works this way.

ilya_baran · April 2016

SMALL, MEDIUM, and LARGE are not globals -- they are enumeration values defined right inside the enum declaration (see https://en.wikipedia.org/wiki/Enumerated_type)
Basically the declaration

export enum Size
{
    REALLY_SMALL,
    MEDIUM,
    TRULY_HUGE
}

defines a new enum type Size and says that a value of type Size may be one of three possible values: Size.REALLY_SMALL, Size.MEDIUM and Size.TRULY_HUGE. See also https://cad.onshape.com/FsDoc/values.html#enumerations for specific info on how enums work "underneath" in FeatureScript .

adamohern · April 2016

Many thanks, Ilya.

Arbitrary drop-down menu?

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