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
|
/*
* Copyright 2000-2014 Vaadin Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.vaadin.client;
import com.google.gwt.core.client.JavaScriptObject;
/**
* Utility class for fetching CSS properties from DOM StyleSheets JS object.
*/
public class CSSRule {
private final String selector;
private JavaScriptObject rules = null;
/**
*
* @param selector
* the CSS selector to search for in the stylesheets
* @param deep
* should the search follow any @import statements?
*/
public CSSRule(final String selector, final boolean deep) {
this.selector = selector;
fetchRule(selector, deep);
}
// TODO how to find the right LINK-element? We should probably give the
// stylesheet a name.
private native void fetchRule(final String selector, final boolean deep)
/*-{
var sheets = $doc.styleSheets;
for(var i = 0; i < sheets.length; i++) {
var sheet = sheets[i];
if(sheet.href && sheet.href.indexOf("VAADIN/themes")>-1) {
// $entry not needed as function is not exported
this.@com.vaadin.client.CSSRule::rules = @com.vaadin.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(sheet, selector, deep);
return;
}
}
this.@com.vaadin.client.CSSRule::rules = [];
}-*/;
/*
* Loops through all current style rules and collects all matching to
* 'rules' array. The array is reverse ordered (last one found is first).
*/
private static native JavaScriptObject searchForRule(
final JavaScriptObject sheet, final String selector,
final boolean deep)
/*-{
if(!$doc.styleSheets)
return null;
selector = selector.toLowerCase();
var allMatches = [];
// IE handles imported sheet differently
if(deep && sheet.imports && sheet.imports.length > 0) {
for(var i=0; i < sheet.imports.length; i++) {
// $entry not needed as function is not exported
var imports = @com.vaadin.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(sheet.imports[i], selector, deep);
allMatches.concat(imports);
}
}
var theRules = new Array();
if (sheet.cssRules)
theRules = sheet.cssRules
else if (sheet.rules)
theRules = sheet.rules
var j = theRules.length;
for(var i=0; i<j; i++) {
var r = theRules[i];
if(r.type == 1 || sheet.imports) {
var selectors = r.selectorText.toLowerCase().split(",");
var n = selectors.length;
for(var m=0; m<n; m++) {
if(selectors[m].replace(/^\s+|\s+$/g, "") == selector) {
allMatches.unshift(r);
break; // No need to loop other selectors for this rule
}
}
} else if(deep && r.type == 3) {
// Search @import stylesheet
// $entry not needed as function is not exported
var imports = @com.vaadin.client.CSSRule::searchForRule(Lcom/google/gwt/core/client/JavaScriptObject;Ljava/lang/String;Z)(r.styleSheet, selector, deep);
allMatches = allMatches.concat(imports);
}
}
return allMatches;
}-*/;
/**
* Returns a specific property value from this CSS rule.
*
* @param propertyName
* camelCase CSS property name
* @return the value of the property as a String
*/
public native String getPropertyValue(final String propertyName)
/*-{
var j = this.@com.vaadin.client.CSSRule::rules.length;
for(var i=0; i<j; i++) {
// $entry not needed as function is not exported
var value = this.@com.vaadin.client.CSSRule::rules[i].style[propertyName];
if(value)
return value;
}
return null;
}-*/;
public String getSelector() {
return selector;
}
}
|
