HTML5 Canvas Simple Scrollbars with KineticJS

Code Editor

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
      canvas {
        border: 1px solid #9C9898;
      }
      #container {
        background-image: url("http://www.html5canvastutorials.com/demos/assets/pixel-art.gif");
        display: inline-block;
        overflow: hidden;
        height: 365px;
        width: 580px;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.2.min.js"></script>
    <script defer="defer">
      var updateBackgroundPos = function() {
        var x = -1 * (hscroll.getPosition().x - 10);
        var y = -1 * (vscroll.getPosition().y - 10);
        container.style.backgroundPosition = x + 'px ' + y + 'px';
      };
      var stage = new Kinetic.Stage({
        container: 'container',
        width: 578,
        height: 363
      });

var layer = new Kinetic.Layer();
      var areas = new Kinetic.Group();
      var scrollbars = new Kinetic.Group();
      var container = stage.getContainer();

/*
       * horizontal scrollbars
       */
      var hscrollArea = new Kinetic.Rect({
        x: 10,
        y: stage.getHeight() - 30,
        width: stage.getWidth() - 40,
        height: 20,
        fill: 'black',
        opacity: 0.3
      });

/*
       * vertical scrollbars
       */
      var vscrollArea = new Kinetic.Rect({
        x: stage.getWidth() - 30,
        y: 10,
        width: 20,
        height: stage.getHeight() - 40,
        fill: 'black',
        opacity: 0.3
      });

/*
       * scrollbars
       */
      scrollbars.on('mouseover', function() {
        document.body.style.cursor = 'pointer';
      });
      scrollbars.on('mouseout', function() {
        document.body.style.cursor = 'default';
      });

hscroll.on('dragmove', updateBackgroundPos);
      vscroll.on('dragmove', updateBackgroundPos);

areas.add(hscrollArea);
      areas.add(vscrollArea);
      scrollbars.add(hscroll);
      scrollbars.add(vscroll);
      layer.add(areas);
      layer.add(scrollbars);
      stage.add(layer);

</script>
  </body>
</html>

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Modified on January 6th, 2013 by Eric Rowell