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 * $Id$
29 */
30
31 package palmed.edit.selection;
32
33 import palmed.edit.text.IText;
34 import palmed.edit.util.Coordinate;
35
36 /***
37 * This class implements an action to insert a character at a given position.
38 *
39 * @author Mathieu Champlon
40 * @version $Revision$ $Date$
41 */
42 public final class CharacterInsertion extends AbstractAction
43 {
44 /***
45 * The selection.
46 */
47 private final ISelection selection_;
48 /***
49 * The text.
50 */
51 private final IText text_;
52 /***
53 * The character to insert.
54 */
55 private final char value_;
56 /***
57 * The insertion position.
58 */
59 private final Coordinate insertion_;
60 /***
61 * The total number of inserted characters.
62 */
63 private int count_;
64
65 /***
66 * Create a type action.
67 *
68 * @param selection the selection
69 * @param text the text
70 * @param value the character to insert
71 * @param insertion the insertion position
72 */
73 public CharacterInsertion( final ISelection selection, final IText text, final char value,
74 final Coordinate insertion )
75 {
76 super( selection );
77 selection_ = selection;
78 text_ = text;
79 value_ = value;
80 insertion_ = insertion;
81 count_ = 1;
82 }
83
84 /***
85 * {@inheritDoc}
86 */
87 protected void onPerform()
88 {
89 text_.insert( insertion_, value_ );
90 selection_.forward();
91 selection_.clear();
92 }
93
94 /***
95 * {@inheritDoc}
96 */
97 protected boolean onUndo()
98 {
99 for( int i = 0; i < count_; ++i )
100 selection_.backward();
101 backupData();
102 selection_.delete();
103 return false;
104 }
105
106 /***
107 * {@inheritDoc}
108 */
109 protected boolean onRedo()
110 {
111 restoreData();
112 for( int i = 0; i < count_; ++i )
113 selection_.forward();
114 return false;
115 }
116
117 /***
118 * {@inheritDoc}
119 */
120 public boolean merge( final IAction action )
121 {
122 if( !(action instanceof CharacterInsertion) )
123 return false;
124 overwriteFinalState( (CharacterInsertion)action );
125 ++count_;
126 return true;
127 }
128 }