AE Custom UI Event -- which parameter is it for?

Question

Several SDK samples show custom parameter UI, but they only have 1 each. And that assumption is baked into the handler (see below).Is there a way to know in PF_Event_DRAW or PF_Event_DO_CLICK which parameter is receiving that event? it must be here...Here's how the SDK samples do it... they just assume which parameter it is!PF_Err DoDrag(PF_InData	*in_data, PF_OutData *out_data,	PF_ParamDef *params[], PF_LayerDef		*output, PF_EventExtra*event_extra)
{
...
...
    // params index hard coded! wont work
    // for two custom params, will it :(
    params[ECW_UI_COLOR]->u.cd.value.blue = someValue
...
...
}

James Whiffin · Accepted Answer

Hi David

In Handle Event you can see which effect index it is, and then delegate specific code for each:

PF_Err
HandleEvent(
            PF_InData        *in_data,
            PF_OutData        *out_data,
            PF_ParamDef        *params[],
            PF_LayerDef        *output,
            PF_EventExtra    *extra)
{
    
    PF_Err            err     = PF_Err_NONE;

    if (extra->effect_win.index == SS3_GRAD)

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