Java tutorial
//package com.java2s; /* * Copyright (C) 2004 NNL Technology AB * Visit www.infonode.net for information about InfoNode(R) * products and how to contact NNL Technology AB. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, * MA 02111-1307, USA. */ import java.awt.Component; import java.awt.KeyboardFocusManager; public class Main { /** * Requests focus unless the component already has focus. For some weird * reason calling {@link Component#requestFocusInWindow()}when the * component is focus owner changes focus owner to another component! * * @param component the component to request focus for * @return true if the component has focus or probably will get focus, * otherwise false */ public static boolean requestFocus(Component component) { /* * System.out.println("Owner: " + * System.identityHashCode(KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner()) + ", " + * System.identityHashCode(component) + ", " + * (KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner() == * component)); */ return KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner() == component || component.requestFocusInWindow(); } }