1 /***
2 * Redistribution and use in source and binary forms, with or without
3 * modification, are permitted provided that the following conditions are
4 * met :
5 *
6 * . Redistributions of source code must retain the above copyright
7 * notice, this list of conditions and the following disclaimer.
8 *
9 * . Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * . The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
24 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
25 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $Id: FileBrowser.java 359 2005-12-23 14:26:53Z mat007 $
29 */
30
31 package palmed.file;
32
33 import javax.microedition.io.file.FileSystemListener;
34 import javax.microedition.io.file.FileSystemRegistry;
35 import javax.microedition.lcdui.Alert;
36 import javax.microedition.lcdui.AlertType;
37 import javax.microedition.lcdui.Command;
38 import javax.microedition.lcdui.CommandListener;
39 import javax.microedition.lcdui.Display;
40 import javax.microedition.lcdui.Displayable;
41 import javax.microedition.lcdui.List;
42 import palmed.ui.IInputListener;
43 import palmed.ui.InputDialog;
44
45 /***
46 * This class implements a file browser.
47 *
48 * @author Mathieu Champlon
49 * @version $Revision: 359 $ $Date: 2005-12-23 23:26:53 +0900 (ven., 23 déc. 2005) $
50 */
51 public final class FileBrowser extends List implements CommandListener, FileSystemListener
52 {
53 /***
54 * The display.
55 */
56 private final Display display_;
57 /***
58 * The displayable to show when closing the browser.
59 */
60 private final Displayable next_;
61 /***
62 * The file list select command.
63 */
64 private final Command selectCommand_ = new Command( "select", Command.OK, 1 );
65 /***
66 * The cancel command.
67 */
68 private final Command cancelCommand_ = new Command( "cancel", Command.OK, 1 );
69 /***
70 * The create file command.
71 */
72 private final Command createFileCommand_ = new Command( "new file", Command.SCREEN, 1 );
73 /***
74 * The create directory command.
75 */
76 private final Command createDirectoryCommand_ = new Command( "new directory", Command.SCREEN, 2 );
77 /***
78 * The file browser listener.
79 */
80 private IFileBrowserListener listener_;
81 /***
82 * Current directory.
83 */
84 private IDirectory current_;
85 /***
86 * Whether file creation should be enabled.
87 */
88 private boolean isFileCreationAllowed_;
89 /***
90 * The directory visitor.
91 */
92 private final DirectoryVisitor visitor_;
93
94 /***
95 * Create a file browser.
96 *
97 * @param display the display
98 * @param next the displayable to display when closing the file browser
99 */
100 public FileBrowser( final Display display, final Displayable next )
101 {
102 super( null, List.IMPLICIT );
103 if( display == null )
104 throw new IllegalArgumentException( "parameter 'display' is null" );
105 if( next == null )
106 throw new IllegalArgumentException( "parameter 'next' is null" );
107 display_ = display;
108 next_ = next;
109 current_ = new Root();
110 visitor_ = new DirectoryVisitor();
111 setCommandListener( this );
112 setSelectCommand( selectCommand_ );
113 addCommand( cancelCommand_ );
114 FileSystemRegistry.addFileSystemListener( this );
115 show();
116 }
117
118 private void show()
119 {
120 deleteAll();
121 try
122 {
123 visitor_.fill( this, current_ );
124 }
125 catch( Exception e )
126 {
127 error( e.getMessage() );
128 }
129 }
130
131 /***
132 * Add or remove the possibility to create a new file and select it.
133 *
134 * @param canCreateFiles whether file creation is allowed or not
135 */
136 public void allowCreation( final boolean canCreateFiles )
137 {
138 isFileCreationAllowed_ = canCreateFiles;
139 checkFileCreation();
140 }
141
142 private void checkFileCreation()
143 {
144 if( isFileCreationAllowed_ && current_.isWritable() )
145 {
146 addCommand( createFileCommand_ );
147 addCommand( createDirectoryCommand_ );
148 }
149 else
150 {
151 removeCommand( createFileCommand_ );
152 removeCommand( createDirectoryCommand_ );
153 }
154 }
155
156 /***
157 * Set or change the file browser listener.
158 *
159 * @param listener the file browser listener
160 */
161 public void setListener( final IFileBrowserListener listener )
162 {
163 listener_ = listener;
164 }
165
166 /***
167 * {@inheritDoc}
168 */
169 public void commandAction( final Command command, final Displayable displayable )
170 {
171 if( command == selectCommand_ )
172 select( getString( getSelectedIndex() ) );
173 else if( command == cancelCommand_ )
174 display_.setCurrent( next_ );
175 else if( command == createFileCommand_ )
176 createFile( this );
177 else if( command == createDirectoryCommand_ )
178 createDirectory( this );
179 }
180
181 private void select( final String filename )
182 {
183 current_ = current_.select( filename, listener_ );
184 checkFileCreation();
185 show();
186 }
187
188 private void createFile( final Displayable next )
189 {
190 final IInputListener listener = new IInputListener()
191 {
192 public void enter( final String value )
193 {
194 select( value );
195 }
196
197 public void cancel()
198 {
199 display_.setCurrent( next );
200 }
201 };
202 display_.setCurrent( new InputDialog( "Save in a new file", "Enter file name", listener ) );
203 }
204
205 private void createDirectory( final Displayable next )
206 {
207 final IInputListener listener = new IInputListener()
208 {
209 public void enter( final String value )
210 {
211 try
212 {
213 current_.create( value );
214 }
215 catch( Exception e )
216 {
217 error( e.getMessage() );
218 }
219 display_.setCurrent( next );
220 show();
221 }
222
223 public void cancel()
224 {
225 display_.setCurrent( next );
226 }
227 };
228 display_.setCurrent( new InputDialog( "Create a directory", "Enter directory name", listener ) );
229 }
230
231 /***
232 * {@inheritDoc}
233 */
234 public void rootChanged( final int state, final String rootName )
235 {
236 if( state == FileSystemListener.ROOT_ADDED || current_.isInPath( rootName ) )
237 current_ = new Root();
238 show();
239 }
240
241 private void error( final String message )
242 {
243 display_.setCurrent( new Alert( "Error", message, null, AlertType.ERROR ), next_ );
244 }
245 }