001/* 002 * This library is part of OpenCms - 003 * the Open Source Content Management System 004 * 005 * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com) 006 * 007 * This library is free software; you can redistribute it and/or 008 * modify it under the terms of the GNU Lesser General Public 009 * License as published by the Free Software Foundation; either 010 * version 2.1 of the License, or (at your option) any later version. 011 * 012 * This library is distributed in the hope that it will be useful, 013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 * Lesser General Public License for more details. 016 * 017 * For further information about Alkacon Software, please see the 018 * company website: http://www.alkacon.com 019 * 020 * For further information about OpenCms, please see the 021 * project website: http://www.opencms.org 022 * 023 * You should have received a copy of the GNU Lesser General Public 024 * License along with this library; if not, write to the Free Software 025 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 026 */ 027 028package org.opencms.ui.components; 029 030import com.vaadin.event.FieldEvents.BlurEvent; 031import com.vaadin.event.FieldEvents.BlurListener; 032import com.vaadin.event.FieldEvents.FocusEvent; 033import com.vaadin.event.FieldEvents.FocusListener; 034import com.vaadin.event.ShortcutListener; 035 036/** 037 * Shortcut listener that will only be active, while the given text field has the keyboard focus.<p> 038 */ 039public abstract class A_CmsFocusShortcutListener extends ShortcutListener implements BlurListener, FocusListener { 040 041 /** The serial version id. */ 042 private static final long serialVersionUID = -4768641299003694650L; 043 044 /** The text field. */ 045 private com.vaadin.ui.TextField m_field; 046 047 /** 048 * Constructor.<p> 049 * 050 * @see com.vaadin.event.ShortcutAction#ShortcutAction(String, int, int...) 051 */ 052 public A_CmsFocusShortcutListener(String caption, int keyCode, int[] modifierKeys) { 053 054 super(caption, keyCode, modifierKeys); 055 } 056 057 /** 058 * @see com.vaadin.event.FieldEvents.BlurListener#blur(com.vaadin.event.FieldEvents.BlurEvent) 059 */ 060 public void blur(BlurEvent event) { 061 062 m_field.removeShortcutListener(this); 063 064 } 065 066 /** 067 * @see com.vaadin.event.FieldEvents.FocusListener#focus(com.vaadin.event.FieldEvents.FocusEvent) 068 */ 069 public void focus(FocusEvent event) { 070 071 m_field.addShortcutListener(this); 072 073 } 074 075 /** 076 * Install the listener on the given text field 077 * 078 * @param field the txt field 079 */ 080 public void installOn(com.vaadin.ui.TextField field) { 081 082 m_field = field; 083 m_field.addFocusListener(this); 084 m_field.addBlurListener(this); 085 } 086 087}