001package votorola.g.web.gwt.event; // Copyright 2010, 2012, Michael Allan. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE. 002 003import com.google.gwt.event.shared.GwtEvent; 004 005 006/** An event that signals a change in the value of a "bound property". Its semantics are 007 * roughly equivalent to the namesake event in {@linkplain java.beans java.beans}. 008 */ 009public final class PropertyChange extends GwtEvent<PropertyChangeHandler> 010{ 011 012 013 /** Creates a PropertyChange. 014 */ 015 public PropertyChange( String _propertyName ) { propertyName = _propertyName; } 016 017 018 019 // ------------------------------------------------------------------------------------ 020 021 022 /** The name to which the property is bound. 023 */ 024 public String propertyName() { return propertyName; } 025 026 027 private final String propertyName; 028 029 030 031 /** The common type key for all property change events. 032 */ 033 public static final Type<PropertyChangeHandler> TYPE = new Type<PropertyChangeHandler>(); 034 // We might have defined a separate type for each property name in order to allow 035 // handlers to register by property name, except that it might consume too much 036 // memory. The implementation of SimpleEventBus (GWT 2.1) creates a separate 037 // handler list for every event type. 038 039 040 041 // - G w t - E v e n t ---------------------------------------------------------------- 042 043 044 public @Override Type<PropertyChangeHandler> getAssociatedType() { return TYPE; } 045 046 047 048 protected @Override void dispatch( final PropertyChangeHandler handler ) 049 { 050 handler.onPropertyChange( PropertyChange.this ); 051 } 052 053 054}