/
csshover3.htc
262 lines (212 loc) · 9.09 KB
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csshover3.htc
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<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>