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Java > Open Source Codes > org > outerj > daisy > frontend > editor > EditModeListener


1 /*
2  * Copyright 2004 Outerthought bvba and Schaubroeck nv
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.outerj.daisy.frontend.editor;
17
18 import org.apache.cocoon.forms.event.ValueChangedListener;
19 import org.apache.cocoon.forms.event.ValueChangedEvent;
20 import org.apache.cocoon.forms.formmodel.Form;
21 import org.apache.cocoon.forms.formmodel.Field;
22 import org.apache.cocoon.forms.formmodel.Widget;
23
24 /**
25  * Listener shared between forms that have a union to allow them to switch
26  * between XML and GUI editing modes.
27  */
28 public class EditModeListener implements ValueChangedListener {
29     private EditModeListenerConfig config;
30
31     public EditModeListener(EditModeListenerConfig config) {
32         this.config = config;
33     }
34
35     public void valueChanged(ValueChangedEvent valueChangedEvent) {
36         String JavaDoc editMode = (String JavaDoc)valueChangedEvent.getNewValue();
37         String JavaDoc oldEditMode = (String JavaDoc)valueChangedEvent.getOldValue();
38         if (oldEditMode == null)
39             return;
40
41         Form form = valueChangedEvent.getSourceWidget().getForm();
42
43         if (form.getAttribute("ignore-editmode-change") != null) {
44             form.removeAttribute("ignore-editmode-change");
45             return;
46
47         }
48
49         Widget widget = form.lookupWidget(oldEditMode.equals("xml") ? config.getXmlFieldPath() : "editors/gui");
50         boolean valid = widget.validate();
51         if (!valid) {
52             // stay in same mode
53 form.setAttribute("ignore-editmode-change", Boolean.TRUE);
54             form.getChild("editmode").setValue(oldEditMode);
55         } else {
56             if (editMode.equals("xml")) {
57                 String JavaDoc xml = config.getXmlFromGuiEditor();
58                 form.lookupWidget(config.getXmlFieldPath()).setValue(xml);
59             } else if (editMode.equals("gui")) {
60                 String JavaDoc value = (String JavaDoc)form.lookupWidget(config.getXmlFieldPath()).getValue();
61                 if (value != null) {
62                     if (!config.loadGui(value)) {
63                         // Stay in xml mode
64 form.setAttribute("ignore-editmode-change", Boolean.TRUE);
65                         form.getChild("editmode").setValue("xml");
66                     }
67                 } else {
68                     config.clearGui();
69                 }
70             }
71         }
72     }
73
74     static interface EditModeListenerConfig {
75         public String JavaDoc getXmlFieldPath();
76         public String JavaDoc getXmlFromGuiEditor();
77         public boolean loadGui(String JavaDoc xml);
78         public void clearGui();
79     }
80 }
81
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