| /******************************************************************************* |
| * Copyright (c) 2000, 2011 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.swt.ole.win32; |
| |
| |
| /** |
| * 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 == null) types = new int [4]; |
| if (handlers == null) handlers = new OleListener [4]; |
| for (int i=0; i<types.length; i++) { |
| if (types [i] == 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); |
| System.arraycopy (handlers, 0, newHandlers, 0, size); |
| types = newTypes; handlers = newHandlers; |
| types [size] = eventType; handlers [size] = handler; |
| } |
| boolean hooks (int eventType) { |
| if (handlers == null) return false; |
| for (int type : types) { |
| if (type == eventType) return true; |
| } |
| return false; |
| } |
| void sendEvent (OleEvent event) { |
| if (handlers == null) return; |
| for (int i=0; i<types.length; i++) { |
| if (types [i] == event.type) { |
| OleListener listener = handlers [i]; |
| if (listener != null) listener.handleEvent (event); |
| } |
| } |
| } |
| void unhook (int eventType, OleListener handler) { |
| if (handlers == null) return; |
| for (int i=0; i<types.length; i++) { |
| if ((types [i] == eventType) && (handlers [i] == handler)) { |
| types [i] = 0; |
| handlers [i] = null; |
| return; |
| } |
| } |
| } |
| boolean hasEntries() { |
| for (int type : types) { |
| if (type != 0) return true; |
| } |
| return false; |
| } |
| } |