001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.wicket.extensions.markup.html.tabs; 018 019import org.apache.wicket.markup.html.WebMarkupContainer; 020import org.apache.wicket.model.IModel; 021 022/** 023 * A simple decorator that will cache the panel returned from the first call to getPanel() 024 * 025 * @see org.apache.wicket.extensions.markup.html.tabs.ITab 026 * @see org.apache.wicket.extensions.markup.html.tabs.TabbedPanel 027 * 028 * @author Igor Vaynberg (ivaynberg) 029 */ 030public class PanelCachingTab implements ITab 031{ 032 private static final long serialVersionUID = 1L; 033 034 // Might Panel or Fragment or ... 035 private WebMarkupContainer panel; 036 037 private final ITab delegate; 038 039 /** 040 * Constructor 041 * 042 * @param delegate 043 * ITab implementation to decorate 044 */ 045 public PanelCachingTab(final ITab delegate) 046 { 047 this.delegate = delegate; 048 } 049 050 /** 051 * {@inheritDoc} 052 */ 053 @Override 054 public IModel<String> getTitle() 055 { 056 return delegate.getTitle(); 057 } 058 059 /** 060 * {@inheritDoc} 061 */ 062 @Override 063 public WebMarkupContainer getPanel(final String panelId) 064 { 065 if (panel == null) 066 { 067 panel = delegate.getPanel(panelId); 068 } 069 return panel; 070 } 071 072 /** 073 * {@inheritDoc} 074 */ 075 @Override 076 public boolean isVisible() 077 { 078 return delegate.isVisible(); 079 } 080}