CmsMediaQueryRuleManager (OpenCms GWT Components API, version 17.0)

java.lang.Object
- org.opencms.gwt.client.CmsMediaQueryRuleManager

```
public class CmsMediaQueryRuleManager
extends java.lang.Object
```
Singleton class that evaluates, and keeps track of changes for, a fixed set of media queries and sets CSS classes on the body element depending on which of the media queries match.

Field Summary

Fields
Modifier and Type Field Description

protected static CmsMediaQueryRuleManager instance
The instance.

Constructor Summary

Constructors
Modifier Constructor Description

protected CmsMediaQueryRuleManager()
Initializes the rules.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addRule(java.lang.String cssClass, java.lang.String mediaQueryText)`	Installs a new media query rule.
`static CmsMediaQueryRuleManager`	`get()`	Gets the instance.
`static void`	`initialize()`	Initializes the manager and sets up the rules.
`void`	`updateBodyClass(java.lang.String cssClass, boolean enabled)`	Adds or removes a CSS class from the body.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - instance
```
protected static CmsMediaQueryRuleManager instance
```
    The instance.
- Constructor Detail
  - CmsMediaQueryRuleManager
```
protected CmsMediaQueryRuleManager()
```
    Initializes the rules.
- Method Detail
  - get
```
public static CmsMediaQueryRuleManager get()
```
    Gets the instance.
    
    Returns:
    
    the instance
  - initialize
```
public static void initialize()
```
    Initializes the manager and sets up the rules.
  - addRule
```
public void addRule(java.lang.String cssClass,
                    java.lang.String mediaQueryText)
```
    Installs a new media query rule.
    
    Parameters:
    
    cssClass - the CSS class to add if the media query matches
    
    mediaQueryText - the text of the media query
  - updateBodyClass
```
public void updateBodyClass(java.lang.String cssClass,
                            boolean enabled)
```
    Adds or removes a CSS class from the body.
    
    Parameters:
    
    cssClass - the CSS class
    
    enabled - true if the class should be added, false to remove it