/*************************************************************************
     This code is from Dynamic Web Coding at dyn-web.com
     Copyright 2008 by Sharon Paine 
     See Terms of Use at www.dyn-web.com/business/terms.php
     regarding conditions under which you may use this code.
     This notice must be retained in the code as is!
 
     unobtrusive event handling for use with dw_scroll.js
     version date: Aug 2008
 *************************************************************************/
 
 /////////////////////////////////////////////////////////////////////
 // two ways to add style sheet for capable browsers
 
 dw_writeStyleSheet = function(file) {
     document.write('<link rel="stylesheet" href="' + file + '" media="screen" />');
 }
 
 function dw_addLinkCSS(file) {
     if ( !document.createElement ) return;
     var el = document.createElement("link");
     el.setAttribute("rel", "stylesheet");
     el.setAttribute("type", "text/css");
     el.setAttribute("media", "screen");
     el.setAttribute("href", file);
     document.getElementsByTagName('head')[0].appendChild(el);
 }
 /////////////////////////////////////////////////////////////////////
 
 // Example class names: load_wn_lyr1, load_wn_lyr2_t2
 dw_scrollObj.prototype.setUpLoadLinks = function(controlsId) {
     var wndoId = this.id; var el = document.getElementById(controlsId); 
     var links = el.getElementsByTagName('a');
     var cls, parts;
     for (var i=0; links[i]; i++) {
         cls = dw_scrollObj.get_DelimitedClass( links[i].className );
         parts = cls.split('_');
         if ( parts[0] == 'load' && parts[1] == wndoId && parts.length > 2 ) {
             // no checks on lyrId, horizId
             var lyrId = parts[2]; var horizId = parts[3]? parts[3]: null;
             dw_Event.add( links[i], 'click', function (wndoId, lyrId, horizId) {
                 return function (e) {
                     dw_scrollObj.col[wndoId].load(lyrId, horizId);
                     if (e && e.preventDefault) e.preventDefault();
                     return false;
                 }
             }(wndoId, lyrId, horizId) ); // see Crockford js good parts pg 39
         }
     }
 }
 
 dw_scrollObj.prototype.setUpScrollControls = function(controlsId, autoHide, axis) {
     var wndoId = this.id; var el = document.getElementById(controlsId); 
     if ( autoHide && axis == 'v' || axis == 'h' ) {
         dw_scrollObj.handleControlVis(controlsId, wndoId, axis);
         dw_Scrollbar_Co.addEvent( this, 'on_load', function() { dw_scrollObj.handleControlVis(controlsId, wndoId, axis); } );
         dw_Scrollbar_Co.addEvent( this, 'on_update', function() { dw_scrollObj.handleControlVis(controlsId, wndoId, axis); } );
     }
     
     var links = el.getElementsByTagName('a'), cls, eType;
     for (var i=0; links[i]; i++) { 
         cls = dw_scrollObj.get_DelimitedClass( links[i].className );
         eType = dw_scrollObj.getEv_FnType( cls.slice(0, cls.indexOf('_') ) );
         switch ( eType ) {
             case 'mouseover' :
             case 'mousedown' :
                 dw_scrollObj.handleMouseOverDownLinks(links[i], wndoId, cls);
                 break;
             case 'scrollToId': 
                 dw_scrollObj.handleScrollToId(links[i], wndoId, cls);
                 break;
             case 'scrollTo' :
             case 'scrollBy':
             case 'click': 
                 dw_scrollObj.handleClick(links[i], wndoId, cls) ;
                 break;
         }
     }
 }
 
 dw_scrollObj.handleMouseOverDownLinks = function (linkEl, wndoId, cls) {
     var parts = cls.split('_'); var eType = parts[0];
     var re = /^(mouseover|mousedown)_(up|down|left|right)(_[\d]+)?$/;
                 
     if ( re.test(cls) ) { 
         var eAlt = (eType == 'mouseover')? 'mouseout': 'mouseup';
         var dir = parts[1];  var speed = parts[2] || null; 
         var deg = (dir == 'up')? 90: (dir == 'down')? 270: (dir == 'left')? 180: 0;
         
         dw_Event.add(linkEl, eType, function (e) { dw_scrollObj.col[wndoId].initScrollVals(deg, speed); } );
         dw_Event.add(linkEl, eAlt, function (e) { dw_scrollObj.col[wndoId].ceaseScroll(); } );
             
         if ( eType == 'mouseover') {
             dw_Event.add( linkEl, 'mousedown', function (e) { dw_scrollObj.col[wndoId].speed *= 3; } );
             dw_Event.add( linkEl, 'mouseup', function (e) { 
                 dw_scrollObj.col[wndoId].speed = dw_scrollObj.prototype.speed; } ); 
         }
         dw_Event.add( linkEl, 'click', function(e) { if (e && e.preventDefault) e.preventDefault(); return false; } );
     }
 }
 
 // scrollToId_smile, scrollToId_smile_100, scrollToId_smile_lyr1_100    
 dw_scrollObj.handleScrollToId = function (linkEl, wndoId, cls) {
     var parts = cls.split('_'); var id = parts[1], lyrId, dur;
     if ( parts[2] ) {
         if ( isNaN( parseInt(parts[2]) ) ) { 
             lyrId = parts[2];
             dur = ( parts[3] && !isNaN( parseInt(parts[3]) ) )? parseInt(parts[3]): null;
         } else {
             dur = parseInt( parts[2] );
         }
     }
     dw_Event.add( linkEl, 'click', function (e) {
             dw_scrollObj.scrollToId(wndoId, id, lyrId, dur);
             if (e && e.preventDefault) e.preventDefault();
             return false;
         } );
 }
 
 // doesn't checks if lyrId in wndo, el in lyrId
 dw_scrollObj.scrollToId = function(wndoId, id, lyrId, dur) {
     var wndo = dw_scrollObj.col[wndoId];
     var el = document.getElementById(id);
     if (el) {
         if ( lyrId ) {
             if ( document.getElementById(lyrId) && wndo.lyrId != lyrId ) {
                 wndo.load(lyrId);
             }
         }
         var lyr = document.getElementById(wndo.lyrId);
         var x = dw_getLayerOffset(el, lyr, 'left');
         var y = dw_getLayerOffset(el, lyr, 'top');
         wndo.initScrollToVals(x, y, dur);
     }
 }
 
 dw_scrollObj.handleClick = function (linkEl, wndoId, cls) {
     var wndo = dw_scrollObj.col[wndoId];
     var parts = cls.split('_'); var eType = parts[0]; 
     var dur_re = /^([\d]+)$/; var fn, re, x, y, dur;
     
     switch (eType) {
         case 'scrollTo' :
             fn = 'scrollTo';  re = /^(null|end|[\d]+)$/;
             x = re.test( parts[1] )? parts[1]: '';
             y = re.test( parts[2] )? parts[2]: '';
             dur = ( parts[3] && dur_re.test(parts[3]) )? parts[3]: null;
             break;
         case 'scrollBy': // scrollBy_m30_m40, scrollBy_null_m100, scrollBy_100_null
             fn = 'scrollBy';  re = /^(([m]?[\d]+)|null)$/;
             x = re.test( parts[1] )? parts[1]: '';
             y = re.test( parts[2] )? parts[2]: '';
             
             // negate numbers (m not - but vice versa) 
             if ( !isNaN( parseInt(x) ) ) {
                 x = -parseInt(x);
             } else if ( typeof x == 'string' ) {
                 x = x.indexOf('m') !=-1 ? x.replace('m', ''): x;
             }
             if ( !isNaN( parseInt(y) ) ) {
                 y = -parseInt(y);
             } else if ( typeof y == 'string' ) {
                 y = y.indexOf('m') !=-1 ? y.replace('m', ''): y;
             }
             
             dur = ( parts[3] && dur_re.test(parts[3]) )? parts[3]: null;
             break;
         
         case 'click': 
             var o = dw_scrollObj.getClickParts(cls);
             fn = o.fn; x = o.x; y = o.y; dur = o.dur;
             break;
     }
     if ( x !== '' && y !== '' ) {
         if (x == 'end') { x = wndo.maxX; }
         if (y == 'end') { y = wndo.maxY; }
         if (x === 'null' || x === null) { x = wndo.x; }
         if (y === 'null' || y === null) { y = wndo.y; }
         
         x = parseInt(x); y = parseInt(y);  
         dur = !isNaN( parseInt(dur) )? parseInt(dur): null;
         
         if (fn == 'scrollBy') {
             dw_Event.add( linkEl, 'click', function (e) {
                     dw_scrollObj.col[wndoId].initScrollByVals(x, y, dur);
                     if (e && e.preventDefault) e.preventDefault();
                     return false;
                 } );
         } else if (fn == 'scrollTo') {
             dw_Event.add( linkEl, 'click', function (e) {
                     dw_scrollObj.col[wndoId].initScrollToVals(x, y, dur);
                     if (e && e.preventDefault) e.preventDefault();
                     return false;
                 } );
         }
     }
 }
 
 // get info from className (e.g., click_down_by_100)
 dw_scrollObj.getClickParts = function(cls) {
     var parts = cls.split('_');
     var re = /^(up|down|left|right)$/;
     var dir, fn = '', dur, ar, val, x = '', y = '';
     
     if ( parts.length >= 4 ) {
         ar = parts[1].match(re);
         dir = ar? ar[1]: null;
             
         re = /^(to|by)$/; 
         ar = parts[2].match(re);
         if (ar) {
             fn = (ar[0] == 'to')? 'scrollTo': 'scrollBy';
         } 
     
         val = parts[3]; // value on x or y axis
         re = /^([\d]+)$/;
         dur = ( parts[4] && re.test(parts[4]) )? parts[4]: null;
     
         switch (fn) {
             case 'scrollBy' :
                 if ( !re.test( val ) ) {
                     x = ''; y = ''; break;
                 }
                 switch (dir) { // 0 for unspecified axis 
                     case 'up' : x = 0; y = val; break;
                     case 'down' : x = 0; y = -val; break;
                     case 'left' : x = val; y = 0; break;
                     case 'right' : x = -val; y = 0;
                  }
                 break;
             case 'scrollTo' :
                 re = /^(end|[\d]+)$/;
                 if ( !re.test( val ) ) {
                     x = ''; y = ''; break;
                 }
                 switch (dir) { // null for unspecified axis 
                     case 'up' : x = null; y = val; break;
                     case 'down' : x = null; y = (val == 'end')? val: -val; break;
                     case 'left' : x = val; y = null; break;
                     case 'right' : x = (val == 'end')? val: -val; y = null;
                  } 
                 break;
          }
     }
     return { fn: fn, x: x, y: y, dur: dur }
 }
 
 dw_scrollObj.getEv_FnType = function(str) {
     var re = /^(mouseover|mousedown|scrollBy|scrollTo|scrollToId|click)$/;
     if (re.test(str) ) {
         return str;
     }
     return '';
 }
 
 // return class name with underscores in it 
 dw_scrollObj.get_DelimitedClass = function(cls) {
     if ( cls.indexOf('_') == -1 ) {
         return '';
     }
     var whitespace = /\s+/;
     if ( !whitespace.test(cls) ) {
         return cls;
     } else {
         var classes = cls.split(whitespace); 
         for(var i = 0; classes[i]; i++) { 
             if ( classes[i].indexOf('_') != -1 ) {
                 return classes[i];
             }
         }
     }
 }
 
 dw_scrollObj.handleControlVis = function(controlsId, wndoId, axis) {
     var wndo = dw_scrollObj.col[wndoId];
     var el = document.getElementById(controlsId);
     if ( ( axis == 'v' && wndo.maxY > 0 ) || ( axis == 'h' && wndo.maxX > 0 ) ) {
         el.style.visibility = 'visible';
     } else {
         el.style.visibility = 'hidden';
     }
 }