<!--
    loading.html
    ~~~~~~~~~~~~

    Loading template for the IPython console

    :copyright: Copyright by the Spyder Project Contributors
    :license: MIT license
-->

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>

<head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
  <link rel="stylesheet" href="file:///${css_path}/default.css" type="text/css"/>

  <!-- Generate throbber animation using an sprites png and javascript
       Taken from https://icons8.com/preloaders/
  -->
  <script type="text/javascript">
    var cSpeed=6;
    var cWidth=16;
    var cHeight=16;
    var cTotalFrames=18;
    var cFrameWidth=16;
    var cImageSrc='file:///${loading_img}';

    var cImageTimeout=false;
    var cIndex=0;
    var cXpos=0;
    var cPreloaderTimeout=false;
    var SECONDS_BETWEEN_FRAMES=0;

    function startAnimation(){

      document.getElementById('loading-image').style.backgroundImage='url('+cImageSrc+')';
      document.getElementById('loading-image').style.width=cWidth+'px';
      document.getElementById('loading-image').style.height=cHeight+'px';

      //FPS = Math.round(100/(maxSpeed+2-speed));
      FPS = Math.round(100/cSpeed);
      SECONDS_BETWEEN_FRAMES = 1 / FPS;

      cPreloaderTimeout=setTimeout('continueAnimation()', SECONDS_BETWEEN_FRAMES/1000);
    }

    function continueAnimation(){
      cXpos += cFrameWidth;
      //increase the index so we know which frame of our animation we are currently on
      cIndex += 1;

      //if our cIndex is higher than our total number of frames, we're at the end and should restart
      if (cIndex >= cTotalFrames) {
        cXpos =0;
        cIndex=0;
      }

      if(document.getElementById('loading-image'))
        document.getElementById('loading-image').style.backgroundPosition=(-cXpos)+'px 0';

      cPreloaderTimeout=setTimeout('continueAnimation()', SECONDS_BETWEEN_FRAMES*1000);
    }

    function stopAnimation(){//stops animation
      clearTimeout(cPreloaderTimeout);
      cPreloaderTimeout=false;
    }

    function imageLoader(s, fun)//Pre-loads the sprites image
    {
      clearTimeout(cImageTimeout);
      cImageTimeout=0;
      genImage = new Image();
      genImage.onload=function (){cImageTimeout=setTimeout(fun, 0)};
      genImage.onerror=new Function('alert(\'Could not load the image\')');
      genImage.src=s;
    }

    //The following code starts the animation
    new imageLoader(cImageSrc, 'startAnimation()');
  </script>
</head>

<body>
  <div class="loading">
    <div id="loading-image"></div>
    <div id="loading-message">${message}</div>
  </div>
</body>

</html>
