bibliothek.gui.dock.extension.css.CssRuleContentUnion Maven / Gradle / Ivy
The newest version!
/*
* Bibliothek - DockingFrames
* Library built on Java/Swing, allows the user to "drag and drop"
* panels containing any Swing-Component the developer likes to add.
*
* Copyright (C) 2013 Benjamin Sigg
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Benjamin Sigg
* [email protected]
* CH - Switzerland
*/
package bibliothek.gui.dock.extension.css;
import java.util.ArrayList;
import java.util.List;
/**
* A {@link CssRuleContent} that collects properties from several other {@link CssRuleContent}s.
* @author Benjamin Sigg
*/
public class CssRuleContentUnion implements CssRuleContent{
/** the properties */
private List contents = new ArrayList();
/** this listener is added to {@link #contents} and forwards any received event */
private Listener listener = new Listener();
/** all the listeners that were ever added to this union */
private List listeners = new ArrayList();
@Override
public T getProperty( CssType type, CssPropertyKey property ){
for( CssRuleContent content : contents ){
T result = content.getProperty( type, property );
if( result != null ){
return result;
}
}
return null;
}
/**
* Adds content to the list of contents, content adds its properties
* to the set of properties.
* @param content the new properties
*/
public void add( CssRuleContent content ){
insert( contents.size(), content );
}
/**
* Adds content to the list of contents, content adds its properties
* to the set of properties.
* @param index the position of content, as lower the number as higher the priority
* of content
* @param content the new properties
*/
public void insert( int index, CssRuleContent content ){
contents.add( index, content );
if( !listeners.isEmpty() ){
content.addRuleContentListener( listener );
listener.propertiesChanged( this );
}
}
/**
* Gets the index'th item of this union.
* @param index the index of an item
* @return the item
*/
public CssRuleContent get( int index ){
return contents.get( index );
}
/**
* Gets the number of items stored int his union.
* @return the number of items
*/
public int size(){
return contents.size();
}
/**
* Removes the index'th {@link CssRuleContent} of this union.
* @param index the index of the element to remove
* @return the removed element
*/
public CssRuleContent remove( int index ){
CssRuleContent content = contents.remove( index );
if( !listeners.isEmpty() ){
content.removeRuleContentListener( listener );
listener.propertiesChanged( this );
}
return content;
}
/**
* Removes content from this union.
* @param content the item to remove
*/
public void remove( CssRuleContent content ){
contents.remove( content );
if( !listeners.isEmpty() ){
content.removeRuleContentListener( listener );
listener.propertiesChanged( this );
}
}
@Override
public void addRuleContentListener( CssRuleContentListener listener ){
if( listener == null ){
throw new IllegalArgumentException( "listener must not be null" );
}
if( listeners.isEmpty() ){
for( CssRuleContent content : contents ){
content.addRuleContentListener( this.listener );
}
}
listeners.add( listener );
}
@Override
public void removeRuleContentListener( CssRuleContentListener listener ){
listeners.remove( listener );
if( listeners.isEmpty() ){
for( CssRuleContent content : contents ){
content.removeRuleContentListener( this.listener );
}
}
}
private CssRuleContentListener[] listeners(){
return listeners.toArray( new CssRuleContentListener[ listeners.size() ] );
}
/**
* Listener monitoring the {@link CssRuleContent}s of a {@link CssRuleContentUnion}.
* @author Benjamin Sigg
*/
private class Listener implements CssRuleContentListener{
@Override
public void propertiesChanged( CssRuleContent source ){
for( CssRuleContentListener listener : listeners() ){
listener.propertiesChanged( CssRuleContentUnion.this );
}
}
@Override
public void propertyChanged( CssRuleContent source, CssPropertyKey key ){
for( CssRuleContentListener listener : listeners() ){
listener.propertyChanged( CssRuleContentUnion.this, key );
}
}
}
}