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 replace the selection (if any) with a new line.
38 *
39 * @author Mathieu Champlon
40 * @version $Revision$ $Date$
41 */
42 public final class NewLineInsertion 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 insertion position.
54 */
55 private final Coordinate insertion_;
56 /***
57 * The total number of inserted characters.
58 */
59 private int count_;
60
61 /***
62 * Create an enter action.
63 *
64 * @param selection the selection
65 * @param text the text
66 * @param insertion the insertion position
67 */
68 public NewLineInsertion( final ISelection selection, final IText text, final Coordinate insertion )
69 {
70 super( selection );
71 selection_ = selection;
72 text_ = text;
73 insertion_ = insertion;
74 count_ = 1;
75 }
76
77 /***
78 * {@inheritDoc}
79 */
80 protected void onPerform()
81 {
82 backupData();
83 selection_.delete();
84 text_.insertNewLine( insertion_ );
85 selection_.forward();
86 selection_.clear();
87 }
88
89 /***
90 * {@inheritDoc}
91 */
92 protected boolean onUndo()
93 {
94 for( int i = 0; i < count_; ++i )
95 selection_.backward();
96 restoreData();
97 return true;
98 }
99
100 /***
101 * {@inheritDoc}
102 */
103 protected boolean onRedo()
104 {
105 selection_.delete();
106 for( int i = 0; i < count_; ++i )
107 {
108 text_.insertNewLine( insertion_ );
109 selection_.forward();
110 }
111 return false;
112 }
113
114 /***
115 * {@inheritDoc}
116 */
117 public boolean merge( final IAction action )
118 {
119 if( !(action instanceof NewLineInsertion) )
120 return false;
121 overwriteFinalState( (NewLineInsertion)action );
122 ++count_;
123 return true;
124 }
125 }