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1   /*
2    * Copyright 2002,2004 The Apache Software Foundation.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.apache.commons.jelly.tags.jface.preference;
17  
18  import java.util.Map;
19  
20  import org.apache.commons.jelly.JellyTagException;
21  import org.apache.commons.jelly.XMLOutput;
22  import org.apache.commons.jelly.tags.core.UseBeanTag;
23  import org.apache.commons.jelly.tags.jface.window.ApplicationWindowTag;
24  import org.eclipse.jface.preference.PreferenceDialog;
25  import org.eclipse.jface.preference.PreferenceManager;
26  import org.eclipse.swt.widgets.Shell;
27  
28  /***
29   * This Tag creates a JFace PreferenceDialog
30   *
31   * @author <a href="mailto:ckl@dacelo.nl">Christiaan ten Klooster</a>
32   */
33  public class PreferenceDialogTag extends UseBeanTag {
34  
35      public PreferenceDialogTag(Class arg0) {
36          super(arg0);
37      }
38  
39      /***
40       * @return PreferenceDialog
41       */
42      public PreferenceDialog getPreferenceDialog() {
43          Object bean = getBean();
44          if (bean instanceof PreferenceDialog) {
45              return (PreferenceDialog) bean;
46          }
47          return null;
48      }
49  
50      /***
51       * @return Shell
52       * @throws JellyTagException
53       */
54      protected Shell getShell() throws JellyTagException {
55          ApplicationWindowTag tag =
56              (ApplicationWindowTag) findAncestorWithClass(ApplicationWindowTag.class);
57  
58          if (tag != null) {
59              return tag.getWindow().getShell();
60  
61          } else {
62              Map attributes = getAttributes();
63              Object parent = attributes.remove("parent");
64              if (parent instanceof Shell) {
65                  return (Shell) parent;
66              } else {
67                  throw new JellyTagException("This tag must be nested inside a <applicationWindow> or have a parent of type Shell");
68              }
69          }
70      }
71  
72      /*
73       * @see org.apache.commons.jelly.tags.core.UseBeanTag#newInstance(java.lang.Class, java.util.Map, org.apache.commons.jelly.XMLOutput)
74       */
75      protected Object newInstance(Class arg0, Map arg1, XMLOutput arg2) throws JellyTagException {
76          PreferenceManager pm = new PreferenceManager();
77          return new PreferenceDialog(getShell(), pm);
78      }
79  
80  }