Mercurial > projects > dwt-linux
view dwt/widgets/EventTable.d @ 27:ffa3c27c4328
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author | Frank Benoit <benoit@tionex.de> |
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date | Wed, 09 Jan 2008 01:08:22 +0100 |
parents | 09f5459a5014 |
children | 10acbb123580 |
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/******************************************************************************* * Copyright (c) 2000, 2007 IBM Corporation and others. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ module dwt.widgets.EventTable; import dwt.widgets.Listener; import dwt.widgets.Event; class EventTable{ public void hook (int eventType, Listener listener) {} public void sendEvent (Event event) ; public bool hooks (int eventType) ; public void unhook (int eventType, Listener listener) ; public int size () ; } /+++ import dwt.*; import dwt.internal.SWTEventListener; /** * Instances of this class implement a simple * look up mechanism that maps an event type * to a listener. Multiple listeners for the * same event type are supported. */ class EventTable { int [] types; Listener [] listeners; int level; public void hook (int eventType, Listener listener) { if (types == null) types = new int [4]; if (listeners == null) listeners = new Listener [4]; int length = types.length, index = length - 1; while (index >= 0) { if (types [index] != 0) break; --index; } index++; if (index == length) { int [] newTypes = new int [length + 4]; System.arraycopy (types, 0, newTypes, 0, length); types = newTypes; Listener [] newListeners = new Listener [length + 4]; System.arraycopy (listeners, 0, newListeners, 0, length); listeners = newListeners; } types [index] = eventType; listeners [index] = listener; } public boolean hooks (int eventType) { if (types == null) return false; for (int i=0; i<types.length; i++) { if (types [i] == eventType) return true; } return false; } public void sendEvent (Event event) { if (types == null) return; level += level >= 0 ? 1 : -1; try { for (int i=0; i<types.length; i++) { if (event.type == SWT.None) return; if (types [i] == event.type) { Listener listener = listeners [i]; if (listener != null) listener.handleEvent (event); } } } finally { boolean compact = level < 0; level -= level >= 0 ? 1 : -1; if (compact && level == 0) { int index = 0; for (int i=0; i<types.length; i++) { if (types [i] != 0) { types [index] = types [i]; listeners [index] = listeners [i]; index++; } } for (int i=index; i<types.length; i++) { types [i] = 0; listeners [i] = null; } } } } public int size () { if (types == null) return 0; int count = 0; for (int i=0; i<types.length; i++) { if (types [i] != 0) count++; } return count; } void remove (int index) { if (level == 0) { int end = types.length - 1; System.arraycopy (types, index + 1, types, index, end - index); System.arraycopy (listeners, index + 1, listeners, index, end - index); index = end; } else { if (level > 0) level = -level; } types [index] = 0; listeners [index] = null; } public void unhook (int eventType, Listener listener) { if (types == null) return; for (int i=0; i<types.length; i++) { if (types [i] == eventType && listeners [i] == listener) { remove (i); return; } } } public void unhook (int eventType, SWTEventListener listener) { if (types == null) return; for (int i=0; i<types.length; i++) { if (types [i] == eventType) { if (listeners [i] instanceof TypedListener) { TypedListener typedListener = (TypedListener) listeners [i]; if (typedListener.getEventListener () == listener) { remove (i); return; } } } } } } +++/