--- /dev/null
+/*******************************************************************************
+ * Copyright (c) 2000, 2016 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.custom;
+
+import org.eclipse.swt.events.*;
+import org.eclipse.swt.internal.*;
+
+/**
+ * Classes which implement this interface provide a method
+ * that deals with the event that is generated when a
+ * key is pressed.
+ *
+ * @see VerifyEvent
+ * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a>
+ */
+@FunctionalInterface
+public interface VerifyKeyListener extends SWTEventListener {
+/**
+ * The following event fields are used:<ul>
+ * <li>event.character is the character that was typed (input)</li>
+ * <li>event.keyCode is the key code that was typed (input)</li>
+ * <li>event.stateMask is the state of the keyboard (input)</li>
+ * <li>event.doit is processed or not (output)</li>
+ * </ul>
+ * @param event the verify event
+ * @see VerifyEvent
+ */
+public void verifyKey (VerifyEvent event);
+}