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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;
17  
18  import org.apache.commons.jelly.JellyTagException;
19  import org.apache.commons.jelly.tags.jface.window.ApplicationWindowImpl;
20  import org.apache.commons.jelly.tags.jface.window.ApplicationWindowTag;
21  import org.apache.commons.jelly.tags.swt.LayoutTag;
22  import org.eclipse.jface.window.Window;
23  import org.eclipse.swt.widgets.Composite;
24  import org.eclipse.swt.widgets.Widget;
25  
26  /***
27   * Implementation of SWT LayoutTag
28   *
29   * @author <a href="mailto:ckl@dacelo.nl">Christiaan ten Klooster</a>
30   */
31  public class JFaceLayoutTag extends LayoutTag {
32  
33      /***
34       * @param layoutClass
35       */
36      public JFaceLayoutTag(Class layoutClass) {
37          super(layoutClass);
38          // TODO Auto-generated constructor stub
39      }
40  
41      /* (non-Javadoc)
42       * @see org.apache.commons.jelly.tags.core.UseBeanTag#processBean(java.lang.String, java.lang.Object)
43       */
44      protected void processBean(String var, Object bean) throws JellyTagException {
45  
46          Widget parent = getParentWidget();
47          if (parent == null) { // perhaps parent is a Window
48              Window window = getParentWindow();
49              if (window != null && window instanceof ApplicationWindowImpl) {
50                  parent = ((ApplicationWindowImpl) window).getContents();
51              }
52          }
53  
54          if (parent instanceof Composite) {
55              Composite composite = (Composite) parent;
56              composite.setLayout(getLayout());
57  
58          } else {
59              throw new JellyTagException("This tag must be nested within a composite widget tag");
60          }
61  
62      }
63  
64      /***
65       * @return the parent window
66       */
67      public Window getParentWindow() {
68          ApplicationWindowTag tag =
69              (ApplicationWindowTag) findAncestorWithClass(ApplicationWindowTag.class);
70          if (tag != null) {
71              return tag.getWindow();
72          }
73          return null;
74      }
75  }
76  
77