//---------------------------------+
//  CARPE  S l i d e r      1.5.1  |
//  2008 - 07 - 09                 |
//  By Tom Hermansson Snickars     |
//  Copyright CARPE Design         |
//  http://carpe.ambiprospect.com/ |
//---------------------------------+

// Global vars. You don't need to make changes here to change your sliders.
// Changing the attributes in your (X)HTML file is enough.
var carpemouseover                = false;
var carpeDefaultSliderLength      = 100;
var carpeSliderDefaultOrientation = 'horizontal';
var carpeSliderClassName          = 'carpe_slider';
var carpeSliderDisplayClassName   = 'carpe_slider_display';
var carpesliders                  = [];
var carpedisplays                 = [];
var carpeslider                   = {};
var carpedisplay                  = {};

// carpeAddLoadEvent
function carpeAddLoadEvent(func)
{
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  }
  else {
    window.onload = function() {
      oldonload();
      func();
    };
  }
}
// carpeGetElementsByClass: Cross-browser function that returns
// an array with all elements that have a class attribute that
// contains className
function carpeGetElementsByClass(className)
{
  var classElements = new Array();
  var els = document.getElementsByTagName("*");
  var elsLen = els.length;
  var pattern = new RegExp("\\b" + className + "\\b");
  for (var i = 0, j = 0; i < elsLen; i++) {
    if ( pattern.test(els[i].className) ) {
      classElements[j] = els[i];
      j++;
    }
  }
  return classElements;
}
// carpeLeft: Cross-browser version of "element.style.left"
// Returns or sets the horizontal position of an element.
function carpeLeft(elmnt, pos)
{
  if (!(elmnt = document.getElementById(elmnt))) return 0;
  if (elmnt.style && (typeof(elmnt.style.left) == 'string')) {
    if (typeof(pos) == 'number') elmnt.style.left = pos + 'px';
    else {
      pos = parseInt(elmnt.style.left);
      if (isNaN(pos)) pos = 0;
    }
  }
  else if (elmnt.style && elmnt.style.pixelLeft) {
    if (typeof(pos) == 'number') elmnt.style.pixelLeft = pos;
    else pos = elmnt.style.pixelLeft;
  }
  return pos;
}
// carpeTop: Cross-browser version of "element.style.top"
// Returns or sets the vertical position of an element.
function carpeTop(elmnt, pos)
{
  if (!(elmnt = document.getElementById(elmnt))) return 0;
  if (elmnt.style && (typeof(elmnt.style.top) == 'string')) {
    if (typeof(pos) == 'number') elmnt.style.top = pos + 'px';
    else {
      pos = parseInt(elmnt.style.top);
      if (isNaN(pos)) pos = 0;
    }
  }
  else if (elmnt.style && elmnt.style.pixelTop) {
    if (typeof(pos) == 'number') elmnt.style.pixelTop = pos;
    else pos = elmnt.style.pixelTop;
  }
  return pos;
}
// moveSlider: Handles slider and display while dragging
function moveSlider(evnt)
{
  var evnt = (!evnt) ? window.event : evnt; // The mousemove event
  if (carpemouseover) { // Only if slider is dragged
    carpeslider.x = carpeslider.startOffsetX + evnt.screenX; // Horizontal mouse position relative to allowed slider positions
    carpeslider.y = carpeslider.startOffsetY + evnt.screenY; // Horizontal mouse position relative to allowed slider positions
    if (carpeslider.x > carpeslider.xMax) carpeslider.x = carpeslider.xMax; // Limit horizontal movement
    if (carpeslider.x < 0) carpeslider.x = 0; // Limit horizontal movement
    if (carpeslider.y > carpeslider.yMax) carpeslider.y = carpeslider.yMax; // Limit vertical movement
    if (carpeslider.y < 0) carpeslider.y = 0; // Limit vertical movement
    carpeLeft(carpeslider.id, carpeslider.x);  // move slider to new horizontal position
    carpeTop(carpeslider.id, carpeslider.y); // move slider to new vertical position
    var sliderVal = carpeslider.x + carpeslider.y; // pixel value of slider regardless of orientation
    var sliderPos = (carpeslider.distance / carpedisplay.valuecount) * 
      Math.round(carpedisplay.valuecount * sliderVal / carpeslider.distance);
    var v = Math.round((sliderPos * carpeslider.scale + carpeslider.from) * // calculate display value
		       Math.pow(10, carpedisplay.decimals)) / Math.pow(10, carpedisplay.decimals);

//     carpedisplay.value = v; // put the new value in the slider display element
    carpedisplay.value = v+"%"; // put the new value in the slider display element

    return false;
  }
  return
    }
// slide: Handles the start of a slider move.
function slide(evnt)
{
  if (!evnt) evnt = window.event; // Get the mouse event causing the slider activation.
  carpeslider = (evnt.target) ? evnt.target : evnt.srcElement; // Get the activated slider element.
  var dist = parseInt(carpeslider.getAttribute('distance')); // The allowed slider movement in pixels.
  carpeslider.distance = dist ? dist : carpeDefaultSliderLength; // Deafault distance from global var.
  var ori = carpeslider.getAttribute('orientation'); // Slider orientation: 'horizontal' or 'vertical'.
  var orientation = ((ori == 'horizontal') || (ori == 'vertical')) ? ori : carpeSliderDefaultOrientation;
  // Default orientation from global variable.
  var displayId = carpeslider.getAttribute('display'); // ID of associated display element.
  carpedisplay = document.getElementById(displayId); // Get the associated display element.
  carpedisplay.sliderId = carpeslider.id; // Associate the display with the correct slider.
  var dec = parseInt(carpedisplay.getAttribute('decimals')); // Number of decimals to be displayed.
  carpedisplay.decimals = dec ? dec : 0; // Default number of decimals: 0.
  var val = parseInt(carpedisplay.getAttribute('valuecount'))  // Allowed number of values in the interval.
    carpedisplay.valuecount = val ? val : carpeslider.distance + 1 // Default number of values: the sliding distance.
    var from = parseFloat(carpedisplay.getAttribute('from')) // Min/start value for the display.
    from = from ? from : 0 // Default min/start value: 0.
    var to = parseFloat(carpedisplay.getAttribute('to')) // Max value for the display.
    to = to ? to : carpeslider.distance // Default number of values: the sliding distance.
    carpeslider.scale = (to - from) / carpeslider.distance // Slider-display scale [value-change per pixel of movement].
    if (orientation == 'vertical') { // Set limits and scale for vertical sliders.
      carpeslider.from = to // Invert for vertical sliders. "Higher is more."
      carpeslider.xMax = 0
      carpeslider.yMax = carpeslider.distance
      carpeslider.scale = -carpeslider.scale // Invert scale for vertical sliders. "Higher is more."
    }
    else { // Set limits for horizontal sliders.
      carpeslider.from = from;
      carpeslider.xMax = carpeslider.distance;
      carpeslider.yMax = 0;
    }
  carpeslider.startOffsetX = carpeLeft(carpeslider.id) - evnt.screenX; // Slider-mouse horizontal offset at start of slide.
  carpeslider.startOffsetY = carpeTop(carpeslider.id) - evnt.screenY; // Slider-mouse vertical offset at start of slide.
  carpemouseover = true;
  document.onmousemove = moveSlider; // Start the action if the mouse is dragged.
  document.onmouseup = sliderMouseUp; // Stop sliding.
  return false;
}
// sliderMouseUp: Handles the mouseup event after moving a slider.
// Snaps the slider position to allowed/displayed value. 
function sliderMouseUp()
{
  if (carpemouseover) {
    var v = (carpedisplay.value) ? carpedisplay.value : 0 // Find last display value.
      var pos = (v - carpeslider.from)/(carpeslider.scale) // Calculate slider position (regardless of orientation).
      if (carpeslider.yMax == 0) {
	pos = (pos > carpeslider.xMax) ? carpeslider.xMax : pos;
	pos = (pos < 0) ? 0 : pos;
	carpeLeft(carpeslider.id, pos); // Snap horizontal slider to corresponding display position.
      }
    if (carpeslider.xMax == 0) {
      pos = (pos > carpeslider.yMax) ? carpeslider.yMax : pos;
      pos = (pos < 0) ? 0 : pos;
      carpeTop(carpeslider.id, pos); // Snap vertical slider to corresponding display position.
    }
    if (document.removeEventListener) { // Remove event listeners from 'document' (W3C).
      document.removeEventListener('mousemove', moveSlider, false);
      document.removeEventListener('mouseup', sliderMouseUp, false);
    }
    else if (document.detachEvent) { // Remove event listeners from 'document' (IE).
      document.detachEvent('onmousemove', moveSlider);
      document.detachEvent('onmouseup', sliderMouseUp);
      document.releaseCapture();
    }
  }
  carpemouseover = false; // Stop the sliding.
}
function focusDisplay(evnt)
{
  if (!evnt) evnt = window.event; // Get the mouse event causing the display activation.
  var carpedisplay = (evnt.target) ? evnt.target : evnt.srcElement; // Get the activated display element.
  var lock = carpedisplay.getAttribute('typelock'); // Is the user allowed to type into the display?
  if (lock == 'on') {
    carpedisplay.blur();
  }
  return;
}
function carpeInit() // Set up the sliders and the displays.
{
  carpesliders = carpeGetElementsByClass(carpeSliderClassName) // Find the horizontal sliders.
    alert ("there are "+carpesliders.length+" sliders");
  for (var i = 0; i < carpesliders.length; i++) {
    carpesliders[i].onmousedown = slide; // Attach event listener.
    alert("mousedown event listener attached");
  }
  carpedisplays = carpeGetElementsByClass(carpeSliderDisplayClassName) // Find the displays.
    for (var i = 0; i < carpedisplays.length; i++) {
      carpedisplays[i].value = carpedisplays[i].defaultValue; // Resets display on page reload.
      carpedisplays[i].onfocus = focusDisplay; // Attach event listener.
    }
}
//carpeAddLoadEvent(carpeInit);