284 lines
9.5 KiB
Plaintext
284 lines
9.5 KiB
Plaintext
<public:attach event="ondocumentready" onevent="CSSHover()" />
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<script>
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/**
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* Whatever:hover - V3.11
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* ------------------------------------------------------------
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* Author - Peter Nederlof, http://www.xs4all.nl/~peterned
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* License - http://creativecommons.org/licenses/LGPL/2.1
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*
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* Special thanks to Sergiu Dumitriu, http://purl.org/net/sergiu,
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* for fixing the expression loop.
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*
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* Whatever:hover is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Whatever:hover is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* howto: body { behavior:url("csshover3.htc"); }
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* ------------------------------------------------------------
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*/
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window.CSSHover = (function(){
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// regular expressions, used and explained later on.
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var REG_INTERACTIVE = /(^|\s)((([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active|focus))/i;
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var REG_AFFECTED = /(.*?)\:(hover|active|focus)/i;
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var REG_PSEUDO = /[^:]+:([a-z\-]+).*/i;
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var REG_SELECT = /(\.([a-z0-9_\-]+):[a-z]+)|(:[a-z]+)/gi;
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var REG_CLASS = /\.([a-z0-9_\-]*on(hover|active|focus))/i;
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var REG_MSIE = /msie (5|6|7)/i;
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var REG_COMPAT = /backcompat/i;
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// property mapping, real css properties must be used in order to clear expressions later on...
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// Uses obscure css properties that no-one is likely to use. The properties are borrowed to
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// set an expression, and are then restored to the most likely correct value.
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var Properties = {
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index: 0,
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list: ['text-kashida', 'text-kashida-space', 'text-justify'],
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get: function() {
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return this.list[(this.index++)%this.list.length];
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}
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};
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// camelize is used to convert css properties from (eg) text-kashida to textKashida
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var camelize = function(str) {
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return str.replace(/-(.)/mg, function(result, match){
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return match.toUpperCase();
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});
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};
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/**
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* Local CSSHover object
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* --------------------------
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*/
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var CSSHover = {
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// array of CSSHoverElements, used to unload created events
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elements: [],
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// buffer used for checking on duplicate expressions
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callbacks: {},
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// init, called once ondomcontentready via the exposed window.CSSHover function
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init:function() {
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// don't run in IE8 standards; expressions don't work in standards mode anyway,
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// and the stuff we're trying to fix should already work properly
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if(!REG_MSIE.test(navigator.userAgent) && !REG_COMPAT.test(window.document.compatMode)) {
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return;
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}
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// start parsing the existing stylesheets
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var sheets = window.document.styleSheets, l = sheets.length;
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for(var i=0; i<l; i++) {
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this.parseStylesheet(sheets[i]);
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}
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},
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// called from init, parses individual stylesheets
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parseStylesheet:function(sheet) {
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// check sheet imports and parse those recursively
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if(sheet.imports) {
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try {
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var imports = sheet.imports;
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var l = imports.length;
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for(var i=0; i<l; i++) {
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this.parseStylesheet(sheet.imports[i]);
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}
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} catch(securityException){
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// trycatch for various possible errors
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}
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}
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// interate the sheet's rules and send them to the parser
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try {
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var rules = sheet.rules;
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var r = rules.length;
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for(var j=0; j<r; j++) {
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this.parseCSSRule(rules[j], sheet);
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}
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} catch(someException){
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// trycatch for various errors, most likely accessing the sheet's rules.
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}
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},
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// magic starts here ...
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parseCSSRule:function(rule, sheet) {
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// The sheet is used to insert new rules into, this must be the same sheet the rule
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// came from, to ensure that relative paths keep pointing to the right location.
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// only parse a rule if it contains an interactive pseudo.
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var select = rule.selectorText;
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if(REG_INTERACTIVE.test(select)) {
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var style = rule.style.cssText;
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// affected elements are found by truncating the selector after the interactive pseudo,
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// eg: "div li:hover" >> "div li"
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var affected = REG_AFFECTED.exec(select)[1];
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// that pseudo is needed for a classname, and defines the type of interaction (focus, hover, active)
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// eg: "li:hover" >> "onhover"
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var pseudo = select.replace(REG_PSEUDO, 'on$1');
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// the new selector is going to use that classname in a new css rule,
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// since IE6 doesn't support multiple classnames, this is merged into one classname
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// eg: "li:hover" >> "li.onhover", "li.folder:hover" >> "li.folderonhover"
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var newSelect = select.replace(REG_SELECT, '.$2' + pseudo);
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// the classname is needed for the events that are going to be set on affected nodes
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// eg: "li.folder:hover" >> "folderonhover"
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var className = REG_CLASS.exec(newSelect)[1];
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// no need to set the same callback more than once when the same selector uses the same classname
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var hash = affected + className;
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if(!this.callbacks[hash]) {
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// affected elements are given an expression under a borrowed css property, because fake properties
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// can't have their expressions cleared. Different properties are used per pseudo, to avoid
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// expressions from overwriting eachother. The expression does a callback to CSSHover.patch,
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// rerouted via the exposed window.CSSHover function.
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var property = Properties.get();
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var atRuntime = camelize(property);
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// because the expression is added to the stylesheet, and styles are always applied to html that is
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// dynamically added to the dom, the expression will also trigger for those new elements (provided
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// they are selected by the affected selector).
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sheet.addRule(affected, property + ':expression(CSSHover(this, "'+pseudo+'", "'+className+'", "'+atRuntime+'"))');
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// hash it, so an identical selector/class combo does not duplicate the expression
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this.callbacks[hash] = true;
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}
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// duplicate expressions need not be set, but the style could differ
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sheet.addRule(newSelect, style);
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}
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},
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// called via the expression, patches individual nodes
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patch:function(node, type, className, property) {
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// restores the borrowed css property to the value of its immediate parent, clearing
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// the expression so that it's not repeatedly called.
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try {
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var value = node.parentNode.currentStyle[property];
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node.style[property] = value;
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} catch(e) {
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// the above reset should never fail, but just in case, clear the runtimeStyle if it does.
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// this will also stop the expression.
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node.runtimeStyle[property] = '';
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}
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// just to make sure, also keep track of patched classnames locally on the node
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if(!node.csshover) {
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node.csshover = [];
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}
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// and check for it to prevent duplicate events with the same classname from being set
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if(!node.csshover[className]) {
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node.csshover[className] = true;
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// create an instance for the given type and class
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var element = new CSSHoverElement(node, type, className);
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// and store that instance for unloading later on
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this.elements.push(element);
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}
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// returns a dummy value to the expression
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return type;
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},
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// unload stuff onbeforeunload
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unload:function() {
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try {
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// remove events
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var l = this.elements.length;
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for(var i=0; i<l; i++) {
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this.elements[i].unload();
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}
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// and set properties to null
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this.elements = [];
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this.callbacks = {};
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} catch (e) {
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}
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}
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};
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/**
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* CSSHoverElement
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* --------------------------
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*/
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// the event types associated with the interactive pseudos
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var CSSEvents = {
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onhover: { activator: 'onmouseenter', deactivator: 'onmouseleave' },
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onactive: { activator: 'onmousedown', deactivator: 'onmouseup' },
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onfocus: { activator: 'onfocus', deactivator: 'onblur' }
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};
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// CSSHoverElement constructor, called via CSSHover.patch
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function CSSHoverElement(node, type, className) {
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// the CSSHoverElement patches individual nodes by manually applying the events that should
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// have fired by the css pseudoclasses, eg mouseenter and mouseleave for :hover.
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this.node = node;
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this.type = type;
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var replacer = new RegExp('(^|\\s)'+className+'(\\s|$)', 'g');
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// store event handlers for removal onunload
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this.activator = function(){ node.className += ' ' + className; };
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this.deactivator = function(){ node.className = node.className.replace(replacer, ' '); };
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// add the events
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node.attachEvent(CSSEvents[type].activator, this.activator);
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node.attachEvent(CSSEvents[type].deactivator, this.deactivator);
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}
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CSSHoverElement.prototype = {
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// onbeforeunload, called via CSSHover.unload
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unload:function() {
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// remove events
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this.node.detachEvent(CSSEvents[this.type].activator, this.activator);
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this.node.detachEvent(CSSEvents[this.type].deactivator, this.deactivator);
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// and set properties to null
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this.activator = null;
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this.deactivator = null;
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this.node = null;
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this.type = null;
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}
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};
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// add the unload to the onbeforeunload event
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window.attachEvent('onbeforeunload', function(){
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CSSHover.unload();
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});
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/**
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* Public hook
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* --------------------------
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*/
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return function(node, type, className, property) {
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if(node) {
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// called via the css expression; patches individual nodes
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return CSSHover.patch(node, type, className, property);
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} else {
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// called ondomcontentready via the public:attach node
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CSSHover.init();
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}
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};
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})();
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</script> |