text: ﻿/**
  * DD_belatedPNG: Adds IE6 support: PNG images for CSS background-image and HTML <IMG/>.
  * Author: Drew Diller
  * Email: drew.diller@gmail.com
  * URL: http://www.dillerdesign.com/experiment/DD_belatedPNG/
  * Version: 0.0.8a
  * Licensed under the MIT License: http://dillerdesign.com/experiment/DD_belatedPNG/#license
  *
  * Example usage:
  * DD_belatedPNG.fix('.png_bg'); // argument is a CSS selector
  * DD_belatedPNG.fixPng( someNode ); // argument is an HTMLDomElement
  **/
  
  /*
  PLEASE READ:
  Absolutely everything in this script is SILLY.  I know this.  IE's rendering of certain pixels doesn't make sense, so neither does this code!
  */
  
  var DD_belatedPNG = {
      ns: 'DD_belatedPNG',
      imgSize: {},
      delay: 10,
      nodesFixed: 0,
      createVmlNameSpace: function () { /* enable VML */
          if (document.namespaces && !document.namespaces[this.ns]) {
              document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml');
          }
      },
      createVmlStyleSheet: function () { /* style VML, enable behaviors */
          /*
          Just in case lots of other developers have added
          lots of other stylesheets using document.createStyleSheet
          and hit the 31-limit mark, let's not use that method!
          further reading: http://msdn.microsoft.com/en-us/library/ms531194(VS.85).aspx
          */
          var screenStyleSheet, printStyleSheet;
          screenStyleSheet = document.createElement('style');
          screenStyleSheet.setAttribute('media', 'screen');
          document.documentElement.firstChild.insertBefore(screenStyleSheet, document.documentElement.firstChild.firstChild);
          if (screenStyleSheet.styleSheet) {
              screenStyleSheet = screenStyleSheet.styleSheet;
              screenStyleSheet.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}');
              screenStyleSheet.addRule(this.ns + '\\:shape', 'position:absolute;');
              screenStyleSheet.addRule('img.' + this.ns + '_sizeFinder', 'behavior:none; border:none; position:absolute; z-index:-1; top:-10000px; visibility:hidden;'); /* large negative top value for avoiding vertical scrollbars for large images, suggested by James O'Brien, http://www.thanatopsic.org/hendrik/ */
              this.screenStyleSheet = screenStyleSheet;
  
              /* Add a print-media stylesheet, for preventing VML artifacts from showing up in print (including preview). */
              /* Thanks to R閙i Pr関ost for automating this! */
              printStyleSheet = document.createElement('style');
              printStyleSheet.setAttribute('media', 'print');
              document.documentElement.firstChild.insertBefore(printStyleSheet, document.documentElement.firstChild.firstChild);
              printStyleSheet = printStyleSheet.styleSheet;
              printStyleSheet.addRule(this.ns + '\\:*', '{display: none !important;}');
              printStyleSheet.addRule('img.' + this.ns + '_sizeFinder', '{display: none !important;}');
          }
      },
      readPropertyChange: function () {
          var el, display, v;
          el = event.srcElement;
          if (!el.vmlInitiated) {
              return;
          }
          if (event.propertyName.search('background') != -1 || event.propertyName.search('border') != -1) {
              DD_belatedPNG.applyVML(el);
          }
          if (event.propertyName == 'style.display') {
              display = (el.currentStyle.display == 'none') ? 'none' : 'block';
              for (v in el.vml) {
                  if (el.vml.hasOwnProperty(v)) {
                      el.vml[v].shape.style.display = display;
                  }
              }
          }
          if (event.propertyName.search('filter') != -1) {
              DD_belatedPNG.vmlOpacity(el);
          }
      },
      vmlOpacity: function (el) {
          if (el.currentStyle.filter.search('lpha') != -1) {
              var trans = el.currentStyle.filter;
              trans = parseInt(trans.substring(trans.lastIndexOf('=') + 1, trans.lastIndexOf(')')), 10) / 100;
              el.vml.color.shape.style.filter = el.currentStyle.filter; /* complete guesswork */
              el.vml.image.fill.opacity = trans; /* complete guesswork */
          }
      },
      handlePseudoHover: function (el) {
          setTimeout(function () { /* wouldn't work as intended without setTimeout */
              DD_belatedPNG.applyVML(el);
          }, 1);
      },
      /**
      * This is the method to use in a document.
      * @param {String} selector - REQUIRED - a CSS selector, such as '#doc .container'
      **/
      fix: function (selector) {
          if (this.screenStyleSheet) {
              var selectors, i;
              selectors = selector.split(','); /* multiple selectors supported, no need for multiple calls to this anymore */
              for (i = 0; i < selectors.length; i++) {
                  this.screenStyleSheet.addRule(selectors[i], 'behavior:expression(DD_belatedPNG.fixPng(this))'); /* seems to execute the function without adding it to the stylesheet - interesting... */
              }
          }
      },
      applyVML: function (el) {
          el.runtimeStyle.cssText = '';
          this.vmlFill(el);
          this.vmlOffsets(el);
          this.vmlOpacity(el);
          if (el.isImg) {
              this.copyImageBorders(el);
          }
      },
      attachHandlers: function (el) {
          var self, handlers, handler, moreForAs, a, h;
          self = this;
          handlers = { resize: 'vmlOffsets', move: 'vmlOffsets' };
          if (el.nodeName == 'A') {
              moreForAs = { mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover', focus: 'handlePseudoHover', blur: 'handlePseudoHover' };
              for (a in moreForAs) {
                  if (moreForAs.hasOwnProperty(a)) {
                      handlers[a] = moreForAs[a];
                  }
              }
          }
          for (h in handlers) {
              if (handlers.hasOwnProperty(h)) {
                  handler = function () {
                      self[handlers[h]](el);
                  };
                  el.attachEvent('on' + h, handler);
              }
          }
          el.attachEvent('onpropertychange', this.readPropertyChange);
      },
      giveLayout: function (el) {
          el.style.zoom = 1;
          if (el.currentStyle.position == 'static') {
              el.style.position = 'relative';
          }
      },
      copyImageBorders: function (el) {
          var styles, s;
          styles = { 'borderStyle': true, 'borderWidth': true, 'borderColor': true };
          for (s in styles) {
              if (styles.hasOwnProperty(s)) {
                  el.vml.color.shape.style[s] = el.currentStyle[s];
              }
          }
      },
      vmlFill: function (el) {
          if (!el.currentStyle) {
              return;
          } else {
              var elStyle, noImg, lib, v, img, imgLoaded;
              elStyle = el.currentStyle;
          }
          for (v in el.vml) {
              if (el.vml.hasOwnProperty(v)) {
                  el.vml[v].shape.style.zIndex = elStyle.zIndex;
              }
          }
          el.runtimeStyle.backgroundColor = '';
          el.runtimeStyle.backgroundImage = '';
          noImg = true;
          if (elStyle.backgroundImage != 'none' || el.isImg) {
              if (!el.isImg) {
                  el.vmlBg = elStyle.backgroundImage;
                  el.vmlBg = el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")') - 5);
              }
              else {
                  el.vmlBg = el.src;
              }
              lib = this;
              if (!lib.imgSize[el.vmlBg]) { /* determine size of loaded image */
                  img = document.createElement('img');
                  lib.imgSize[el.vmlBg] = img;
                  img.className = lib.ns + '_sizeFinder';
                  img.runtimeStyle.cssText = 'behavior:none; position:absolute; left:-10000px; top:-10000px; border:none; margin:0; padding:0;'; /* make sure to set behavior to none to prevent accidental matching of the helper elements! */
                  imgLoaded = function () {
                      this.width = this.offsetWidth; /* weird cache-busting requirement! */
                      this.height = this.offsetHeight;
                      lib.vmlOffsets(el);
                  };
                  img.attachEvent('onload', imgLoaded);
                  img.src = el.vmlBg;
                  img.removeAttribute('width');
                  img.removeAttribute('height');
                  document.body.insertBefore(img, document.body.firstChild);
              }
              el.vml.image.fill.src = el.vmlBg;
              noImg = false;
          }
          el.vml.image.fill.on = !noImg;
          el.vml.image.fill.color = 'none';
          el.vml.color.shape.style.backgroundColor = elStyle.backgroundColor;
          el.runtimeStyle.backgroundImage = 'none';
          el.runtimeStyle.backgroundColor = 'transparent';
      },
      /* IE can't figure out what do when the offsetLeft and the clientLeft add up to 1, and the VML ends up getting fuzzy... so we have to push/enlarge things by 1 pixel and then clip off the excess */
      vmlOffsets: function (el) {
          var thisStyle, size, fudge, makeVisible, bg, bgR, dC, altC, b, c, v;
          thisStyle = el.currentStyle;
          size = { 'W': el.clientWidth + 1, 'H': el.clientHeight + 1, 'w': this.imgSize[el.vmlBg].width, 'h': this.imgSize[el.vmlBg].height, 'L': el.offsetLeft, 'T': el.offsetTop, 'bLW': el.clientLeft, 'bTW': el.clientTop };
          fudge = (size.L + size.bLW == 1) ? 1 : 0;
          /* vml shape, left, top, width, height, origin */
          makeVisible = function (vml, l, t, w, h, o) {
              vml.coordsize = w + ',' + h;
              vml.coordorigin = o + ',' + o;
              vml.path = 'm0,0l' + w + ',0l' + w + ',' + h + 'l0,' + h + ' xe';
              vml.style.width = w + 'px';
              vml.style.height = h + 'px';
              vml.style.left = l + 'px';
              vml.style.top = t + 'px';
          };
          makeVisible(el.vml.color.shape, (size.L + (el.isImg ? 0 : size.bLW)), (size.T + (el.isImg ? 0 : size.bTW)), (size.W - 1), (size.H - 1), 0);
          makeVisible(el.vml.image.shape, (size.L + size.bLW), (size.T + size.bTW), (size.W), (size.H), 1);
          bg = { 'X': 0, 'Y': 0 };
          if (el.isImg) {
              bg.X = parseInt(thisStyle.paddingLeft, 10) + 1;
              bg.Y = parseInt(thisStyle.paddingTop, 10) + 1;
          }
          else {
              for (b in bg) {
                  if (bg.hasOwnProperty(b)) {
                      this.figurePercentage(bg, size, b, thisStyle['backgroundPosition' + b]);
                  }
              }
          }
          el.vml.image.fill.position = (bg.X / size.W) + ',' + (bg.Y / size.H);
          bgR = thisStyle.backgroundRepeat;
          dC = { 'T': 1, 'R': size.W + fudge, 'B': size.H, 'L': 1 + fudge }; /* these are defaults for repeat of any kind */
          altC = { 'X': { 'b1': 'L', 'b2': 'R', 'd': 'W' }, 'Y': { 'b1': 'T', 'b2': 'B', 'd': 'H'} };
          if (bgR != 'repeat' || el.isImg) {
              c = { 'T': (bg.Y), 'R': (bg.X + size.w), 'B': (bg.Y + size.h), 'L': (bg.X) }; /* these are defaults for no-repeat - clips down to the image location */
              if (bgR.search('repeat-') != -1) { /* now let's revert to dC for repeat-x or repeat-y */
                  v = bgR.split('repeat-')[1].toUpperCase();
                  c[altC[v].b1] = 1;
                  c[altC[v].b2] = size[altC[v].d];
              }
              if (c.B > size.H) {
                  c.B = size.H;
              }
              el.vml.image.shape.style.clip = 'rect(' + c.T + 'px ' + (c.R + fudge) + 'px ' + c.B + 'px ' + (c.L + fudge) + 'px)';
          }
          else {
              el.vml.image.shape.style.clip = 'rect(' + dC.T + 'px ' + dC.R + 'px ' + dC.B + 'px ' + dC.L + 'px)';
          }
      },
      figurePercentage: function (bg, size, axis, position) {
          var horizontal, fraction;
          fraction = true;
          horizontal = (axis == 'X');
          switch (position) {
              case 'left':
              case 'top':
                  bg[axis] = 0;
                  break;
              case 'center':
                  bg[axis] = 0.5;
                  break;
              case 'right':
              case 'bottom':
                  bg[axis] = 1;
                  break;
              default:
                  if (position.search('%') != -1) {
                      bg[axis] = parseInt(position, 10) / 100;
                  }
                  else {
                      fraction = false;
                  }
          }
          bg[axis] = Math.ceil(fraction ? ((size[horizontal ? 'W' : 'H'] * bg[axis]) - (size[horizontal ? 'w' : 'h'] * bg[axis])) : parseInt(position, 10));
          if (bg[axis] % 2 === 0) {
              bg[axis]++;
          }
          return bg[axis];
      },
      fixPng: function (el) {
          el.style.behavior = 'none';
          var lib, els, nodeStr, v, e;
          if (el.nodeName == 'BODY' || el.nodeName == 'TD' || el.nodeName == 'TR') { /* elements not supported yet */
              return;
          }
          el.isImg = false;
          if (el.nodeName == 'IMG') {
              if (el.src.toLowerCase().search(/\.png$/) != -1) {
                  el.isImg = true;
                  el.style.visibility = 'hidden';
              }
              else {
                  return;
              }
          }
          else if (el.currentStyle.backgroundImage.toLowerCase().search('.png') == -1) {
              return;
          }
          lib = DD_belatedPNG;
          el.vml = { color: {}, image: {} };
          els = { shape: {}, fill: {} };
          for (v in el.vml) {
              if (el.vml.hasOwnProperty(v)) {
                  for (e in els) {
                      if (els.hasOwnProperty(e)) {
                          nodeStr = lib.ns + ':' + e;
                          el.vml[v][e] = document.createElement(nodeStr);
                      }
                  }
                  el.vml[v].shape.stroked = false;
                  el.vml[v].shape.appendChild(el.vml[v].fill);
                  el.parentNode.insertBefore(el.vml[v].shape, el);
              }
          }
          el.vml.image.shape.fillcolor = 'none'; /* Don't show blank white shapeangle when waiting for image to load. */
          el.vml.image.fill.type = 'tile'; /* Makes image show up. */
          el.vml.color.fill.on = false; /* Actually going to apply vml element's style.backgroundColor, so hide the whiteness. */
          lib.attachHandlers(el);
          lib.giveLayout(el);
          lib.giveLayout(el.offsetParent);
          el.vmlInitiated = true;
          lib.applyVML(el); /* Render! */
      }
  };
  try {
      document.execCommand("BackgroundImageCache", false, true); /* TredoSoft Multiple IE doesn't like this, so try{} it */
  } catch (r) { }
  DD_belatedPNG.createVmlNameSpace();
  DD_belatedPNG.createVmlStyleSheet();