function keyDown()

in _content/talks/2010/support/slidy.js [731:883]
131 lines of code
46 McCabe index (conditional complexity)

function keyDown(event)
{
    var key;

    if (!event)
      var event = window.event;

    // kludge around NS/IE differences 
    if (window.event)
       key = window.event.keyCode;
    else if (event.which)
       key = event.which;
    else
       return true; // Yikes! unknown browser

    // ignore event if key value is zero
    // as for alt on Opera and Konqueror
    if (!key)
       return true;

    // check for concurrent control/command/alt key
    // but are these only present on mouse events?

    if (event.ctrlKey || event.altKey || event.metaKey)
       return true;

    // dismiss table of contents if visible
    if (isShownToc() && key != 9 && key != 16 && key != 38 && key != 40)
    {
      hideTableOfContents();

      if (key == 27 || key == 84 || key == 67)
        return cancel(event);
    }

    if (key == 34) // Page Down
    {
       nextSlide(false);
       return cancel(event);
    }
    else if (key == 33) // Page Up
    {
       previousSlide(false);
       return cancel(event);
    }
    else if (key == 32) // space bar
    {
       nextSlide(true);
       return cancel(event);
    }
    else if (key == 37 || key == 38) // Left arrow || Up arrow
    {
       previousSlide(!event.shiftKey);
       return cancel(event);
    }
    else if (key == 36) // Home
    {
       firstSlide();
       return cancel(event);
    }
    else if (key == 35) // End
    {
       lastSlide();
       return cancel(event);
    }
    else if (key == 39 || key == 40) // Right arrow || Down arrow
    {
       nextSlide(!event.shiftKey);
       return cancel(event);
    }
    else if (key == 13) // Enter
    {
       if (outline)
       {
          if (outline.visible)
            fold(outline);
          else
            unfold(outline);
          
         return cancel(event);
       }
    }
    else if (key == 188)  // < for smaller fonts
    {
       smaller();
       return cancel(event);
    }
    else if (key == 190)  // > for larger fonts
    {
       bigger();
       return cancel(event);
    }
    else if (key == 189 || key == 109)  // - for smaller fonts
    {
       smaller();
       return cancel(event);
    }
    else if (key == 187 || key == 191 || key == 107)  // = +  for larger fonts
    {
       bigger();
       return cancel(event);
    }
    else if (key == 83)  // S for smaller fonts
    {
       smaller();
       return cancel(event);
    }
    else if (key == 66)  // B for larger fonts
    {
       bigger();
       return cancel(event);
    }
    else if (key == 90)  // Z for last slide
    {
       lastSlide();
       return cancel(event);
    }
    else if (key == 70)  // F for toggle toolbar
    {
       toggleToolbar();
       return cancel(event);
    }
    else if (key == 65)  // A for toggle view single/all slides
    {
       toggleView();
       return cancel(event);
    }
    else if (key == 75)  // toggle action of left click for next page
    {
       mouseClickEnabled = !mouseClickEnabled;
       alert((mouseClickEnabled ? "enabled" : "disabled") +  " mouse click advance");
       return cancel(event);
    }
    else if (key == 84 || key == 67)  // T or C for table of contents
    {
       if (toc)
         showTableOfContents();

       return cancel(event);
    }
    else if (key == 72) // H for help
    {
       window.location = helpPage;
       return cancel(event);
    }

    //else if (key == 93) // Windows menu key
      //alert("lastShown is " + lastShown);
    //else alert("key code is "+ key);


    return true;
}