public static void addClassName(String className, Element element) {
assert (className != null) : "Unexpectedly null class name";
className = className.trim();
assert (className.length() != 0) : "Unexpectedly empty class name";
// Get the current style string.
String oldClassName = element.getClassName();
int idx = oldClassName.indexOf(className);
// Calculate matching index.
while (idx != -1) {
if (idx == 0 || oldClassName.charAt(idx - 1) == ' ') {
int last = idx + className.length();
int lastPos = oldClassName.length();
if ((last == lastPos) || ((last < lastPos) && (oldClassName.charAt(last) == ' '))) {
break;
}
}
idx = oldClassName.indexOf(className, idx + 1);
}
// Only add the style if it's not already present.
if (idx == -1) {
if (oldClassName.length() > 0) {
oldClassName += " ";
}
element.setClassName(oldClassName + className);
}
}
public static boolean hasClassName(String className, Element element) {
assert className != null : "Unexpected null class name";
String currentClassName = element.getClassName();
return (currentClassName != null)
&& (currentClassName.equals(className)
|| currentClassName.startsWith(className + " ")
|| currentClassName.endsWith(" " + className)
|| currentClassName.indexOf(" " + className + " ") != -1);
}
public static void removeClassName(String className, Element element) {
assert (className != null) : "Unexpectedly null class name";
className = className.trim();
assert (className.length() != 0) : "Unexpectedly empty class name";
// Get the current style string.
String oldStyle = element.getClassName();
int idx = oldStyle.indexOf(className);
// Calculate matching index.
while (idx != -1) {
if (idx == 0 || oldStyle.charAt(idx - 1) == ' ') {
int last = idx + className.length();
int lastPos = oldStyle.length();
if ((last == lastPos) || ((last < lastPos) && (oldStyle.charAt(last) == ' '))) {
break;
}
}
idx = oldStyle.indexOf(className, idx + 1);
}
// Don't try to remove the style if it's not there.
if (idx != -1) {
// Get the leading and trailing parts, without the removed name.
String begin = oldStyle.substring(0, idx).trim();
String end = oldStyle.substring(idx + className.length()).trim();
// Some contortions to make sure we don't leave extra spaces.
String newClassName;
if (begin.length() == 0) {
newClassName = end;
} else if (end.length() == 0) {
newClassName = begin;
} else {
newClassName = begin + " " + end;
}
element.setClassName(newClassName);
}
}
