object_meta_programming_slides/slides/ui/pngbehavior.htc

   1 <public:component lightWeight="true">
   2 <public:attach event="onpropertychange" onevent="propertyChanged()" />
   3 <public:attach event="onbeforeprint" onevent="beforePrint()" for="window"/>
   4 <public:attach event="onafterprint" onevent="afterPrint()" for="window"/>
   5 <script>
   6
   7 /*
   8  * PNG Behavior
   9  *
  10  * This script was created by Erik Arvidsson (http://webfx.eae.net/contact.html#erik)
  11  * for WebFX (http://webfx.eae.net)
  12  * Copyright 2002-2004
  13  *
  14  * For usage see license at http://webfx.eae.net/license.html
  15  *
  16  * Version: 1.02
  17  * Created: 2001-??-??  First working version
  18  * Updated: 2002-03-28  Fixed issue when starting with a non png image and
  19  *                      switching between non png images
  20  *          2003-01-06  Fixed RegExp to correctly work with IE 5.0x
  21  *          2004-05-09  When printing revert to original
  22  *
  23  */
  24
  25 var supported = /MSIE ((5\.5)|[6789])/.test(navigator.userAgent) &&
  26                                 navigator.platform == "Win32";
  27
  28 var realSrc;
  29 var blankSrc = "blank.gif";
  30 var isPrinting = false;
  31
  32 if (supported) fixImage();
  33
  34 function propertyChanged() {
  35         if (!supported || isPrinting) return;
  36
  37         var pName = event.propertyName;
  38         if (pName != "src") return;
  39         // if not set to blank
  40         if (!new RegExp(blankSrc).test(src))
  41                 fixImage();
  42 };
  43
  44 function fixImage() {
  45         // get src
  46         var src = element.src;
  47
  48         // check for real change
  49         if (src == realSrc && /\.png$/i.test(src)) {
  50                 element.src = blankSrc;
  51                 return;
  52         }
  53
  54         if ( ! new RegExp(blankSrc).test(src)) {
  55                 // backup old src
  56                 realSrc = src;
  57         }
  58
  59         // test for png
  60         if (/\.png$/i.test(realSrc)) {
  61                 // set blank image
  62                 element.src = blankSrc;
  63                 // set filter
  64                 element.runtimeStyle.filter = "progid:DXImageTransform.Microsoft." +
  65                                         "AlphaImageLoader(src='" + src + "',sizingMethod='image')";
  66         }
  67         else {
  68                 // remove filter
  69                 element.runtimeStyle.filter = "";
  70         }
  71 }
  72
  73 function beforePrint() {
  74         isPrinting = true;
  75         element.src = realSrc;
  76         element.runtimeStyle.filter = "";
  77         realSrc = null;
  78 }
  79
  80 function afterPrint() {
  81         isPrinting = false;
  82         fixImage();
  83 }
  84
  85 </script>
  86 </public:component>
  87