/*******************************************************************************
 * Copyright (c) 2003, 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.browser;

import java.util.*;

/**
 * This listener interface may be implemented in order to receive
 * a {@link WindowEvent} notification when a new {@link Browser}
 * needs to be provided by the application.
 *
 * @see Browser#addOpenWindowListener(OpenWindowListener)
 * @see Browser#removeOpenWindowListener(OpenWindowListener)
 * @see CloseWindowListener
 * @see VisibilityWindowListener
 *
 * @since 3.0
 */
@FunctionalInterface
public interface OpenWindowListener extends EventListener {

/**
 * This method is called when a new window needs to be created.
 * <p>
 * A particular <code>Browser</code> can be passed to the event.browser
 * field to host the content of a new window.
 * <p>
 * A standalone system browser is used to host the new window
 * if the event.required field value is <code>false</code> and if the event.browser
 * field is left <code>null</code>. The event.required field
 * is <code>true</code> on platforms that don't support a standalone system browser for
 * new window requests.
 * <p>
 * The navigation is cancelled if the event.required field is set to
 * <code>true</code> and the event.browser field is left <code>null</code>.</p>
 * <p>The following fields in the <code>WindowEvent</code> apply:</p>
 * <ul>
 * <li>(in/out) {@link WindowEvent#required}: true if the platform requires the user to provide a
 * <code>Browser</code> to handle the new window or false otherwise.
 * <li>(out) {@link WindowEvent#browser}: the new (unique) <code>Browser</code> that will host the
 * content of the new window.
 * <li>(in) widget the <code>Browser</code> that is requesting to open a
 * new window
 * </ul>
 *
 * @param event the <code>WindowEvent</code> that needs to be passed a new
 * <code>Browser</code> to handle the new window request
 *
 * @since 3.0
 */
public void open(WindowEvent event);
}
