Java tutorial
//package com.java2s; /* * This file is part of WebLookAndFeel library. * * WebLookAndFeel library 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 3 of the License, or * (at your option) any later version. * * WebLookAndFeel library 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 WebLookAndFeel library. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.Component; import java.awt.Container; import javax.swing.FocusManager; public class Main { /** * Returns whether component or any of its children has focus or not. * * @param component * component to process * @return true if component or any of its children has focus, false * otherwise */ public static boolean hasFocusOwner(final Component component) { final Component focusOwner = FocusManager.getCurrentManager().getFocusOwner(); return component == focusOwner || component instanceof Container && ((Container) component).isAncestorOf(focusOwner); } }