Checking whether template part is loaded in a page

You can define a global variable in your theme functions.php

global $mywidgets;
$mywidgets = false;

in your template part add

global $mywidgets;
$mywidgets = true;

and in your functions you can check if its set to true:

function my_function(){
    global $mywidgets;
    $mywidgets = true;
    if ($mywidgets){
       // YES Your template part is loaded
    }else{
       // NO Your template part is not loaded
    }
}