/*******************************************************************************
 * 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
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/
module dwt.ole.win32.OleEventTable;

import dwt.ole.win32.OleListener;
import dwt.ole.win32.OleEvent;

import dwt.dwthelper.utils;

/**
* The OleEventTable class implements a simple
* look up mechanism that maps an event type
* to a listener.  Multiple listeners for the
* same event type are supported.
*
*/

class OleEventTable {
    int [] types;
    OleListener [] handlers;
void hook (int eventType, OleListener handler) {
    if (types is null) types = new int [4];
    if (handlers is null) handlers = new OleListener [4];
    for (int i=0; i<types.length; i++) {
        if (types [i] is 0) {
            types [i] = eventType;
            handlers [i] = handler;
            return;
        }
    }
    int size = types.length;
    int [] newTypes = new int [size + 4];
    OleListener [] newHandlers = new OleListener [size + 4];
    System.arraycopy (types, 0, newTypes, 0, size);
    SimpleType!(OleListener).arraycopy (handlers, 0, newHandlers, 0, size);
    types = newTypes;  handlers = newHandlers;
    types [size] = eventType;  handlers [size] = handler;
}
bool hooks (int eventType) {
    if (handlers is null) return false;
    for (int i=0; i<types.length; i++) {
        if (types [i] is eventType) return true;
    }
    return false;
}
void sendEvent (OleEvent event) {
    if (handlers is null) return;
    for (int i=0; i<types.length; i++) {
        if (types [i] is event.type) {
            OleListener listener = handlers [i];
            if (listener !is null) listener.handleEvent (event);
        }
    }
}
void unhook (int eventType, OleListener handler) {
    if (handlers is null) return;
    for (int i=0; i<types.length; i++) {
        if ((types [i] is eventType) && (handlers [i] is handler)) {
            types [i] = 0;
            handlers [i] = null;
            return;
        }
    }
}
bool hasEntries() {
    for (int i=0; i<types.length; i++) {
        if (types[i] !is 0) return true;
    }
    return false;
}
}