Mercurial > projects > dwt-addons
view dwtx/draw2d/EventListenerList.d @ 200:eb3414669eb0 default tip
fix for dmd 1.041 and tango 0.99.8
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 28 Mar 2009 03:09:57 +0100 |
parents | 95307ad235d9 |
children |
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/******************************************************************************* * Copyright (c) 2000, 2005 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 * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwtx.draw2d.EventListenerList; import dwt.dwthelper.utils; import dwtx.dwtxhelper.Collection; /** * This class is intended for internal use only. * TODO: If this is for internal use only, we should move it to the internal package. */ public final class EventListenerList { private /+volatile+/ Object array[]; /** * Adds a listener of type <i>c</i> to the list. * @param c the class * @param listener the listener */ public synchronized void addListener(ClassInfo c, Object listener) { if (listener is null || c is null) throw new IllegalArgumentException(""); int oldSize = (array is null) ? 0 : array.length; Object[] newArray = new Object[oldSize + 2]; if (oldSize !is 0) System.arraycopy(array, 0, newArray, 0, oldSize); newArray[oldSize++] = c; newArray[oldSize] = listener; array = newArray; } /** * Returns <code>true</code> if this list of listeners contains a listener of type * <i>c</i>. * @param c the type * @return whether this list contains a listener of type <i>c</i> */ public synchronized bool containsListener(ClassInfo c) { if (array is null) return false; for (int i = 0; i < array.length; i += 2) if (array[i] is c) return true; return false; } static class TypeIterator : Iterator { private final Object[] items; private final ClassInfo type; private int index; this(Object items[], ClassInfo type) { this.items = items; this.type = type; } public Object next() { Object result = items[index + 1]; index += 2; return result; } public bool hasNext() { if (items is null) return false; while (index < items.length && items[index] !is type) index += 2; return index < items.length; } public void remove() { throw new UnsupportedOperationException("Iterator removal not supported"); //$NON-NLS-1$ } } /** * Returns an Iterator of all the listeners of type <i>c</i>. * @param listenerType the type * @return an Iterator of all the listeners of type <i>c</i> */ public synchronized Iterator getListeners(ClassInfo listenerType) { return new TypeIterator(array, listenerType); } /** * Removes the first <i>listener</i> of the specified type by identity. * @param c the type * @param listener the listener */ public synchronized void removeListener(ClassInfo c, Object listener) { if (array is null || array.length is 0) return; if (listener is null || c is null) throw new IllegalArgumentException(""); int index = 0; while (index < array.length) { if (array[index] is c && array[index + 1] is listener) break; index += 2; } if (index is array.length) return; //listener was not found Object newArray[] = new Object[array.length - 2]; System.arraycopy(array, 0, newArray, 0, index); System.arraycopy(array, index + 2, newArray, index, array.length - index - 2); array = newArray; } }