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Diffstat (limited to 'skins/vector/csshover.htc')
| -rw-r--r-- | skins/vector/csshover.htc | 262 |
1 files changed, 262 insertions, 0 deletions
diff --git a/skins/vector/csshover.htc b/skins/vector/csshover.htc new file mode 100644 index 0000000..a88fa08 --- /dev/null +++ b/skins/vector/csshover.htc @@ -0,0 +1,262 @@ +<public:attach event="ondocumentready" onevent="CSSHover()" /> +<script> +// <?)|(a([^#.][^ ]+)+)):(hover|active|focus))/i, + REG_AFFECTED = /(.*?)\:(hover|active|focus)/i, + REG_PSEUDO = /[^:]+:([a-z-]+).*/i, + REG_SELECT = /(\.([a-z0-9_-]+):[a-z]+)|(:[a-z]+)/gi, + REG_CLASS = /\.([a-z0-9_-]*on(hover|active|focus))/i, + REG_MSIE = /msie (5|6|7)/i, + REG_COMPAT = /backcompat/i; + + // css prefix, a leading dash would be nice (spec), but IE6 doesn't like that. + var CSSHOVER_PREFIX = 'csh-'; + + /** + * Local CSSHover object + * -------------------------- + */ + + var CSSHover = { + + // array of CSSHoverElements, used to unload created events + elements: [], + + // buffer used for checking on duplicate expressions + callbacks: {}, + + // init, called once ondomcontentready via the exposed window.CSSHover function + init:function() { + // don't run in IE8 standards; expressions don't work in standards mode anyway, + // and the stuff we're trying to fix should already work properly + if(!REG_MSIE.test(navigator.userAgent) && !REG_COMPAT.test(window.document.compatMode)) return; + + // start parsing the existing stylesheets + var sheets = window.document.styleSheets, l = sheets.length; + for(var i=0; i<l; i++) { + this.parseStylesheet(sheets[i]); + } + }, + + // called from init, parses individual stylesheets + parseStylesheet:function(sheet) { + // check sheet imports and parse those recursively + if(sheet.imports) { + try { + var imports = sheet.imports, l = imports.length; + for(var i=0; i<l; i++) { + this.parseStylesheet(sheet.imports[i]); + } + } catch(securityException){ + // trycatch for various possible errors, + // todo; might need to be placed inside the for loop, since an error + // on an import stops following imports from being processed. + } + } + + // interate the sheet's rules and send them to the parser + try { + var rules = sheet.rules, l = rules.length; + for(var j=0; j<l; j++) { + this.parseCSSRule(rules[j], sheet); + } + } catch(securityException){ + // trycatch for various errors, most likely accessing the sheet's rules, + // don't see how individual rules would throw errors, but you never know. + } + }, + + // magic starts here ... + parseCSSRule:function(rule, sheet) { + + // The sheet is used to insert new rules into, this must be the same sheet the rule + // came from, to ensure that relative paths keep pointing to the right location. + + // only parse a rule if it contains an interactive pseudo. + var select = rule.selectorText; + if(REG_INTERACTIVE.test(select)) { + var style = rule.style.cssText, + + // affected elements are found by truncating the selector after the interactive pseudo, + // eg: "div li:hover" >> "div li" + affected = REG_AFFECTED.exec(select)[1], + + // that pseudo is needed for a classname, and defines the type of interaction (focus, hover, active) + // eg: "li:hover" >> "onhover" + pseudo = select.replace(REG_PSEUDO, 'on$1'), + + // the new selector is going to use that classname in a new css rule, + // since IE6 doesn't support multiple classnames, this is merged into one classname + // eg: "li:hover" >> "li.onhover", "li.folder:hover" >> "li.folderonhover" + newSelect = select.replace(REG_SELECT, '.$2' + pseudo), + + // the classname is needed for the events that are going to be set on affected nodes + // eg: "li.folder:hover" >> "folderonhover" + className = REG_CLASS.exec(newSelect)[1]; + + // no need to set the same callback more than once when the same selector uses the same classname + var hash = affected + className; + if(!this.callbacks[hash]) { + + // affected elements are given an expression under a fake css property, the classname is used + // because a unique name (eg "behavior:") would be overruled (in IE6, not 7) by a following rule + // selecting the same element. The expression does a callback to CSSHover.patch, rerouted via the + // exposed window.CSSHover function. + + // because the expression is added to the stylesheet, and styles are always applied to html that is + // dynamically added to the dom, the expression will also trigger for those new elements (provided + // they are selected by the affected selector). + + sheet.addRule(affected, CSSHOVER_PREFIX + className + ':expression(CSSHover(this, "'+pseudo+'", "'+className+'"))'); + + // hash it, so an identical selector/class combo does not duplicate the expression + this.callbacks[hash] = true; + } + + // duplicate expressions need not be set, but the style could differ + sheet.addRule(newSelect, style); + } + }, + + // called via the expression, patches individual nodes + patch:function(node, type, className) { + + // the patch's type is returned to the expression. That way the expression property + // can be found and removed, to stop it from calling patch over and over. + // The if will fail the first time, since the expression has not yet received a value. + var property = CSSHOVER_PREFIX + className; + if(node.style[property]) { + node.style[property] = null; + } + + // just to make sure, also keep track of patched classnames locally on the node + if(!node.csshover) node.csshover = []; + + // and check for it to prevent duplicate events with the same classname from being set + if(!node.csshover[className]) { + node.csshover[className] = true; + + // create an instance for the given type and class + var element = new CSSHoverElement(node, type, className); + + // and store that instance for unloading later on + this.elements.push(element); + } + + // returns a dummy value to the expression + return type; + }, + + // unload stuff onbeforeunload + unload:function() { + try { + + // remove events + var l = this.elements.length; + for(var i=0; i<l; i++) { + this.elements[i].unload(); + } + + // and set properties to null + this.elements = []; + this.callbacks = {}; + + } catch (e) { + } + } + }; + + // add the unload to the onbeforeunload event + window.attachEvent('onbeforeunload', function(){ + CSSHover.unload(); + }); + + /** + * CSSHoverElement + * -------------------------- + */ + + // the event types associated with the interactive pseudos + var CSSEvents = { + onhover: { activator: 'onmouseenter', deactivator: 'onmouseleave' }, + onactive: { activator: 'onmousedown', deactivator: 'onmouseup' }, + onfocus: { activator: 'onfocus', deactivator: 'onblur' } + }; + + // CSSHoverElement constructor, called via CSSHover.patch + function CSSHoverElement(node, type, className) { + + // the CSSHoverElement patches individual nodes by manually applying the events that should + // have fired by the css pseudoclasses, eg mouseenter and mouseleave for :hover. + + this.node = node; + this.type = type; + var replacer = new RegExp('(^|\\s)'+className+'(\\s|$)', 'g'); + + // store event handlers for removal onunload + this.activator = function(){ node.className += ' ' + className; }; + this.deactivator = function(){ node.className = node.className.replace(replacer, ' '); }; + + // add the events + node.attachEvent(CSSEvents[type].activator, this.activator); + node.attachEvent(CSSEvents[type].deactivator, this.deactivator); + } + + CSSHoverElement.prototype = { + // onbeforeunload, called via CSSHover.unload + unload:function() { + + // remove events + this.node.detachEvent(CSSEvents[this.type].activator, this.activator); + this.node.detachEvent(CSSEvents[this.type].deactivator, this.deactivator); + + // and set properties to null + this.activator = null; + this.deactivator = null; + this.node = null; + this.type = null; + } + }; + + /** + * Public hook + * -------------------------- + */ + + return function(node, type, className) { + if(node) { + // called via the css expression; patches individual nodes + return CSSHover.patch(node, type, className); + } else { + // called ondomcontentready via the public:attach node + CSSHover.init(); + } + }; + +})(); + +// ]]> +</script>
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