resources/src/mediawiki/mediawiki.requestIdleCallback.js

   1 /*!
   2  * An interface for scheduling background tasks.
   3  *
   4  * Loosely based on https://w3c.github.io/requestidlecallback/
   5  */
   6 ( function ( mw ) {
   7         var maxBusy = 50;
   8
   9         mw.requestIdleCallbackInternal = function ( callback ) {
  10                 setTimeout( function () {
  11                         var start = mw.now();
  12                         callback( {
  13                                 didTimeout: false,
  14                                 timeRemaining: function () {
  15                                         return Math.max( 0, maxBusy - ( mw.now() - start ) );
  16                                 }
  17                         } );
  18                 }, 1 );
  19         };
  20
  21         /**
  22          * Schedule a deferred task to run in the background.
  23          *
  24          * @member mw
  25          * @param {Function} callback
  26          */
  27         mw.requestIdleCallback = window.requestIdleCallback
  28                 // Bind because it throws TypeError if context is not window
  29                 ? window.requestIdleCallback.bind( window )
  30                 : mw.requestIdleCallbackInternal;
  31 }( mediaWiki ) );