forked from PeterFeicht/cppreference-doc
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathcsshover.htc
More file actions
284 lines (235 loc) · 9.48 KB
/
csshover.htc
File metadata and controls
284 lines (235 loc) · 9.48 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
<public:attach event="ondocumentready" onevent="CSSHover()" />
<script>
/**
* Whatever:hover - V3.11
* ------------------------------------------------------------
* Author - Peter Nederlof, http://www.xs4all.nl/~peterned
* License - http://creativecommons.org/licenses/LGPL/2.1
*
* Special thanks to Sergiu Dumitriu, http://purl.org/net/sergiu,
* for fixing the expression loop.
*
* Whatever:hover is free software; you can redistribute it and/or
* modify it under the terms of the GNU Less
8000
er General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Whatever:hover is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* howto: body { behavior:url("csshover3.htc"); }
* ------------------------------------------------------------
*/
window.CSSHover = (function(){
// regular expressions, used and explained later on.
var REG_INTERACTIVE = /(^|\s)((([^a]([^ ]+)?)|(a([^#.][^ ]+)+)):(hover|active|focus))/i;
var REG_AFFECTED = /(.*?)\:(hover|active|focus)/i;
var REG_PSEUDO = /[^:]+:([a-z\-]+).*/i;
var REG_SELECT = /(\.([a-z0-9_\-]+):[a-z]+)|(:[a-z]+)/gi;
var REG_CLASS = /\.([a-z0-9_\-]*on(hover|active|focus))/i;
var REG_MSIE = /msie (5|6|7)/i;
var REG_COMPAT = /backcompat/i;
// property mapping, real css properties must be used in order to clear expressions later on...
// Uses obscure css properties that no-one is likely to use. The properties are borrowed to
// set an expression, and are then restored to the most likely correct value.
var Properties = {
index: 0,
list: ['text-kashida', 'text-kashida-space', 'text-justify'],
get: function() {
return this.list[(this.index++)%this.list.length];
}
};
// camelize is used to convert css properties from (eg) text-kashida to textKashida
var camelize = function(str) {
return str.replace(/-(.)/mg, function(result, match){
return match.toUpperCase();
});
};
/**
* 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;
var l = imports.length;
for(var i=0; i<l; i++) {
this.parseStylesheet(sheet.imports[i]);
}
} catch(securityException){
// trycatch for various possible errors
}
}
// interate the sheet's rules and send them to the parser
try {
var rules = sheet.rules;
var r = rules.length;
for(var j=0; j<r; j++) {
this.parseCSSRule(rules[j], sheet);
}
} catch(someException){
// trycatch for various errors, most likely accessing the sheet's rules.
}
},
// 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"
var 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"
var 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"
var 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"
var 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 borrowed css property, because fake properties
// can't have their expressions cleared. Different properties are used per pseudo, to avoid
// expressions from overwriting eachother. The expression does a callback to CSSHover.patch,
// rerouted via the exposed window.CSSHover function.
var property = Properties.get();
var atRuntime = camelize(property);
// 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, property + ':expression(CSSHover(this, "'+pseudo+'", "'+className+'", "'+atRuntime+'"))');
// 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, property) {
// restores the borrowed css property to the value of its immediate parent, clearing
// the expression so that it's not repeatedly called.
try {
var value = node.parentNode.currentStyle[property];
node.style[property] = value;
} catch(e) {
// the above reset should never fail, but just in case, clear the runtimeStyle if it does.
// this will also stop the expression.
node.runtimeStyle[property] = '';
}
// 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) {
}
}
};
/**
* 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;
}
};
// add the unload to the onbeforeunload event
window.attachEvent('onbeforeunload', function(){
CSSHover.unload();
});
/**
* Public hook
* --------------------------
*/
return function(node, type, className, property) {
if(node) {
// called via the css expression; patches individual nodes
return CSSHover.patch(node, type, className, property);
} else {
// called ondomcontentready via the public:attach node
CSSHover.init();
}
};
})();
</script>