1 /**************************************************************
2  *
3  * Licensed to the Apache Software Foundation (ASF) under one
4  * or more contributor license agreements.  See the NOTICE file
5  * distributed with this work for additional information
6  * regarding copyright ownership.  The ASF licenses this file
7  * to you under the Apache License, Version 2.0 (the
8  * "License"); you may not use this file except in compliance
9  * with the License.  You may obtain a copy of the License at
10  *
11  *   http://www.apache.org/licenses/LICENSE-2.0
12  *
13  * Unless required by applicable law or agreed to in writing,
14  * software distributed under the License is distributed on an
15  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16  * KIND, either express or implied.  See the License for the
17  * specific language governing permissions and limitations
18  * under the License.
19  *
20  *************************************************************/
21 
22 
23 
24 // __________ Imports __________
25 
26 import com.sun.star.uno.UnoRuntime;
27 
28 import java.awt.*;
29 import javax.swing.*;
30 import java.lang.String;
31 
32 // __________ Implementation __________
33 
34 /**
35  * Implement a view to show status informations
36  * of currently loaded document of a document view.
37  * It use separate listener threads to get this informations
38  * and actualize it automatically if frame broadcast changes of
39  * his contained document.
40  * Threads are necessary to prevent this view against deadlocks.
41  * These deadlocks can occur if a listener will be notified
42  * by the office in an "oneway" method and try to call back
43  * to the office by using a synchronous method.
44  * UNO must guarantee order of all these calls ... and if
45  * the source of arrived event holds a mutex and our synchronous
46  * call needs this mutex too => a deadlock occur.
47  * Why? UNO had created a new thread for our synchronous call
48  * inside the office process and so exist different threads
49  * for this constellation.
50  *
51  * @author     Andreas Schlüns
52  * @created    20.06.2002 15:08
53  */
54 public class StatusView extends    JPanel
55                         implements IShutdownListener
56 {
57     // ____________________
58 
59     /**
60      * const
61      * These URL's describe available feature states.
62      */
63     public static final String FEATUREURL_FONT      = "slot:10007";
64     public static final String FEATUREURL_SIZE      = "slot:10015";
65     public static final String FEATUREURL_BOLD      = "slot:10009";
66     public static final String FEATUREURL_ITALIC    = "slot:10008";
67     public static final String FEATUREURL_UNDERLINE = "slot:10014";
68 
69     // ____________________
70 
71     /**
72      * const
73      * These values are used to show current state of showed feature.
74      */
75     public static final String FONT_OFF         = "unknown" ;
76     public static final String SIZE_OFF         = "0.0"     ;
77     public static final String BOLD_OFF         = "-"       ;
78     public static final String ITALIC_OFF       = "-"       ;
79     public static final String UNDERLINE_OFF    = "-"       ;
80 
81     public static final String FONT_ON          = ""        ;
82     public static final String SIZE_ON          = ""        ;
83     public static final String BOLD_ON          = "X"       ;
84     public static final String ITALIC_ON        = "X"       ;
85     public static final String UNDERLINE_ON     = "X"       ;
86 
87     // ____________________
88 
89     /**
90      * @member  mlaFontValue            shows status of font name
91      * @member  mlaSizeValue            shows status of font size
92      * @member  mlaBoldValue            shows status of font style bold
93      * @member  mlaUnderlineValue       shows status of font style underline
94      * @member  mlaItalicValue          shows status of font style italic
95      *
96      * @member  maFontListener          threadsafe(!) helper to listen for status event which describe font name
97      * @member  maSizeListener          threadsafe(!) helper to listen for status event which describe font size
98      * @member  maBoldListener          threadsafe(!) helper to listen for status event which describe font style bold
99      * @member  maUnderlineListener     threadsafe(!) helper to listen for status event which describe font style underline
100      * @member  maItalicListener        threadsafe(!) helper to listen for status event which describe font style italic
101      */
102     private JLabel              m_laFontValue            ;
103     private JLabel              m_laSizeValue            ;
104     private JLabel              m_laBoldValue            ;
105     private JLabel              m_laUnderlineValue       ;
106     private JLabel              m_laItalicValue          ;
107 
108     private StatusListener      m_aFontListener          ;
109     private StatusListener      m_aSizeListener          ;
110     private StatusListener      m_aBoldListener          ;
111     private StatusListener      m_aUnderlineListener     ;
112     private StatusListener      m_aItalicListener        ;
113 
114     // ____________________
115 
116     /**
117      * ctor
118      * Create view controls on startup and initialize it with default values.
119      * Filling of view items can be done by special set-methods.
120      * We don't start listening here! see setFrame() for that ...
121      */
StatusView()122     StatusView()
123     {
124         this.setLayout(new GridBagLayout());
125 
126         GridBagConstraints aConstraint = new GridBagConstraints();
127         aConstraint.anchor = GridBagConstraints.NORTHWEST;
128         aConstraint.insets = new Insets(2,2,2,2);
129         aConstraint.gridy  = 0;
130         aConstraint.gridx  = 0;
131 
132         JLabel laFont      = new JLabel("Font"     );
133         JLabel laSize      = new JLabel("Size"     );
134         JLabel laBold      = new JLabel("Bold"     );
135         JLabel laUnderline = new JLabel("Underline");
136         JLabel laItalic    = new JLabel("Italic"   );
137 
138         m_laFontValue       = new JLabel();
139         m_laSizeValue       = new JLabel();
140         m_laBoldValue       = new JLabel();
141         m_laUnderlineValue  = new JLabel();
142         m_laItalicValue     = new JLabel();
143 
144         aConstraint.gridx = 0;
145         this.add( laFont, aConstraint );
146         aConstraint.gridx = 1;
147         this.add( m_laFontValue, aConstraint );
148 
149         ++aConstraint.gridy;
150 
151         aConstraint.gridx = 0;
152         this.add( laSize, aConstraint );
153         aConstraint.gridx = 1;
154         this.add( m_laSizeValue, aConstraint );
155 
156         ++aConstraint.gridy;
157 
158         aConstraint.gridx = 0;
159         this.add( laSize, aConstraint );
160         aConstraint.gridx = 1;
161         this.add( m_laSizeValue, aConstraint );
162 
163         ++aConstraint.gridy;
164 
165         aConstraint.gridx = 0;
166         this.add( laBold, aConstraint );
167         aConstraint.gridx = 1;
168         this.add( m_laBoldValue, aConstraint );
169 
170         ++aConstraint.gridy;
171 
172         aConstraint.gridx = 0;
173         this.add( laUnderline, aConstraint );
174         aConstraint.gridx = 1;
175         this.add( m_laUnderlineValue, aConstraint );
176 
177         ++aConstraint.gridy;
178 
179         aConstraint.gridx = 0;
180         this.add( laItalic, aConstraint );
181         aConstraint.gridx = 1;
182         this.add( m_laItalicValue, aConstraint );
183 
184         m_laFontValue.setEnabled     (false);
185         m_laSizeValue.setEnabled     (false);
186         m_laBoldValue.setEnabled     (false);
187         m_laItalicValue.setEnabled   (false);
188         m_laUnderlineValue.setEnabled(false);
189 
190         m_laFontValue.setText     (FONT_OFF     );
191         m_laSizeValue.setText     (SIZE_OFF     );
192         m_laBoldValue.setText     (BOLD_OFF     );
193         m_laItalicValue.setText   (ITALIC_OFF   );
194         m_laUnderlineValue.setText(UNDERLINE_OFF);
195     }
196 
197     // ____________________
198 
199     /**
200      * Set new frame for this view and start listening for events immediately.
201      * We create one status listener for every control we wish to update.
202      * And because the environment of the frame can be changed - these
203      * listener refresh himself internally for frame action events too.
204      * So we register it as such frame action listener only here.
205      * Rest is done automatically ...
206      *
207      * @param xFrame
208      *          will be used as source of possible status events
209      */
setFrame(com.sun.star.frame.XFrame xFrame)210     public void setFrame(com.sun.star.frame.XFrame xFrame)
211     {
212         if (xFrame==null)
213             return;
214 
215         // create some listener on given frame for available status events
216         // Created listener instances will register herself on this frame and
217         // show her received informations automatically on set UI controls.
218         m_aFontListener      = new StatusListener(m_laFontValue     ,FONT_ON     ,FONT_OFF     ,xFrame, FEATUREURL_FONT     );
219         m_aSizeListener      = new StatusListener(m_laSizeValue     ,SIZE_ON     ,SIZE_OFF     ,xFrame, FEATUREURL_SIZE     );
220         m_aBoldListener      = new StatusListener(m_laBoldValue     ,BOLD_ON     ,BOLD_OFF     ,xFrame, FEATUREURL_BOLD     );
221         m_aItalicListener    = new StatusListener(m_laItalicValue   ,ITALIC_ON   ,ITALIC_OFF   ,xFrame, FEATUREURL_ITALIC   );
222         m_aUnderlineListener = new StatusListener(m_laUnderlineValue,UNDERLINE_ON,UNDERLINE_OFF,xFrame, FEATUREURL_UNDERLINE);
223 
224         m_aFontListener.startListening();
225         m_aSizeListener.startListening();
226         m_aBoldListener.startListening();
227         m_aItalicListener.startListening();
228         m_aUnderlineListener.startListening();
229     }
230 
231     // ____________________
232 
233     /**
234      * If this java application shutdown - we must cancel all current existing
235      * listener connections. Otherwise the office will run into some
236      * DisposedExceptions if it tries to use these forgotten listener references.
237      * And of course it can die doing that.
238      * We are registered at a central object to be informed if the VM will exit.
239      * So we can react.
240      */
shutdown()241     public void shutdown()
242     {
243         m_aFontListener.shutdown();
244         m_aSizeListener.shutdown();
245         m_aBoldListener.shutdown();
246         m_aItalicListener.shutdown();
247         m_aUnderlineListener.shutdown();
248 
249         m_aFontListener      = null;
250         m_aSizeListener      = null;
251         m_aBoldListener      = null;
252         m_aItalicListener    = null;
253         m_aUnderlineListener = null;
254     }
255 }
256