001package votorola.g.web.gwt.event; // Copyright 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.core.client.Scheduler; 004import com.google.gwt.event.shared.GwtEvent; 005import com.google.gwt.event.shared.HasHandlers; 006 007 008/** An event that signals a change. 009 */ 010public final class Change extends GwtEvent<ChangeHandler> 011{ 012 013 014 /** The common type key for all change events. 015 */ 016 public static final Type<ChangeHandler> TYPE = new Type<ChangeHandler>(); 017 018 019 020 // - G w t - E v e n t ---------------------------------------------------------------- 021 022 023 public @Override Type<ChangeHandler> getAssociatedType() { return TYPE; } 024 025 026 027 protected @Override void dispatch( final ChangeHandler h ) { h.onChange( Change.this ); } 028 029 030 031 // ==================================================================================== 032 033 034 /** A coalescing scheduler for the dispatch of change events. Call {@linkplain 035 * #schedule() schedule}() one or more times to fire a single event in the next 036 * dispatch phase. 037 */ 038 public static final class CoalescingGun extends CoalescingSchedulerS 039 implements Scheduler.ScheduledCommand 040 { 041 042 /** Constructs a new CoalescingGun. 043 * 044 * @see #source() 045 * @see #phaser() 046 */ 047 public CoalescingGun( HasHandlers _source, Phaser _phaser ) 048 { 049 super( Scheduler.get(), _phaser ); 050 source = _source; 051 init( CoalescingGun.this ); 052 } 053 054 055 // -------------------------------------------------------------------------------- 056 057 058 /** The source from which the change events are to be fired. 059 */ 060 public HasHandlers source() { return source; } 061 062 063 private final HasHandlers source; 064 065 066 // - S c h e d u l e r . S c h e d u l e d - C o m m a n d ------------------------ 067 068 069 public void execute() { source.fireEvent( new Change() ); } 070 071 } 072}