gateway-shell/src/main/java/org/apache/knox/gateway/shell/commands/SwingUtils.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.knox.gateway.shell.commands;

import java.awt.Component;
import java.awt.Window;
import java.awt.event.HierarchyEvent;
import java.awt.event.HierarchyListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.SwingUtilities;
import javax.swing.text.JTextComponent;

public class SwingUtils {

  // JDK-5018574 : Unable to set focus to another component in JOptionPane
  public static void workAroundFocusIssue(JTextComponent field) {
    field.addHierarchyListener(new HierarchyListener() {
      @Override
      public void hierarchyChanged(HierarchyEvent e) {
        final Component c = e.getComponent();
        if (c.isShowing() && (e.getChangeFlags() &
          HierarchyEvent.SHOWING_CHANGED) != 0) {
          Window toplevel = SwingUtilities.getWindowAncestor(c);
          toplevel.addWindowFocusListener(new WindowAdapter() {
              @Override
              public void windowGainedFocus(WindowEvent e) {
                  c.requestFocus();
              }
          });
        }
      }
    });
  }
}