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1
21
22 package org.armedbear.j;
23
24 import javax.swing.undo.AbstractUndoableEdit  ;
25 import javax.swing.undo.UndoableEdit ;
26
27 public class UndoDeleteRegion extends AbstractUndoableEdit
28 implements Constants, UndoableEdit
29 {
30 private final PreState preState;
31 private PostState postState;
32 private final LineSequence lines;
33
34 public UndoDeleteRegion(Editor editor, Region r)
35 {
36 Debug.assertTrue(!editor.isColumnSelection());
37 preState = new PreState(editor);
38 lines = new LineSequence(r.getBeginLine(), r.getEndLine());
39 }
40
41 public void undo()
42 {
43 super.undo();
44 final Editor editor = Editor.currentEditor();
45 final Buffer buffer = editor.getBuffer();
46 postState = new PostState(editor);
47 preState.restoreState(editor);
48 editor.setUpdateFlag(REFRAME);
49
50 if (postState.modificationCount != preState.modificationCount) {
51 buffer.invalidate();
53 Sidebar.setUpdateFlagInAllFrames(SIDEBAR_MODIFIED_BUFFER_COUNT |
54 SIDEBAR_REPAINT_BUFFER_LIST);
55 Sidebar.repaintBufferListInAllFrames();
56 }
57 }
58
59 public void redo()
60 {
61 super.redo();
62 final Editor editor = Editor.currentEditor();
63 final Buffer buffer = editor.getBuffer();
64 postState.restoreState(editor);
65 editor.setUpdateFlag(REFRAME);
66
67 if (postState.modificationCount != preState.modificationCount) {
68 buffer.invalidate();
70 Sidebar.setUpdateFlagInAllFrames(SIDEBAR_MODIFIED_BUFFER_COUNT |
71 SIDEBAR_REPAINT_BUFFER_LIST);
72 Sidebar.repaintBufferListInAllFrames();
73 }
74 }
75
76 private class PreState
77 {
78 final int dotLineNumber;
79 final int dotOffset;
80 final int markLineNumber;
81 final int markOffset;
82 final int absCaretCol;
83 final int modificationCount;
84 final boolean modified;
85
86 PreState(Editor editor)
87 {
88 final Line dotLine = editor.getDotLine();
89 dotLineNumber = dotLine.lineNumber();
90 dotOffset = editor.getDotOffset();
91 absCaretCol = editor.getAbsoluteCaretCol();
92 Position mark = editor.getMark();
93 if (mark != null) {
94 markLineNumber = mark.lineNumber();
95 markOffset = mark.getOffset();
96 } else {
97 markLineNumber = -1;
98 markOffset = -1;
99 }
100 final Buffer buffer = editor.getBuffer();
101 modificationCount = buffer.getModCount();
102 modified = buffer.isModified();
103 }
104
105 void restoreState(Editor editor)
107 {
108 final Buffer buffer = editor.getBuffer();
109
110 final Line dotLine = editor.getDotLine();
111 final Line before = dotLine.previous();
112 final Line after = dotLine.next();
113
114 editor.adjustMarkers(dotLine);
115
116 Line first = lines.getFirstLine();
117 Line last = lines.getLastLine();
118 first.setPrevious(before);
119 if (before != null)
120 before.setNext(first);
121 else
122 buffer.setFirstLine(first);
123 last.setNext(after);
124 if (after != null)
125 after.setPrevious(last);
126
127 buffer.setModCount(modificationCount);
128
129 buffer.needsRenumbering = true;
130 buffer.renumber();
131
132 editor.setDot(dotLineNumber, dotOffset);
133 editor.setMark(markLineNumber, markOffset);
134 final Display display = editor.getDisplay();
135 display.setCaretCol(absCaretCol - display.getShift());
136 display.setUpdateFlag(REPAINT);
137 }
138 }
139
140 private class PostState
141 {
142 final int dotLineNumber;
143 final int dotOffset;
144 final int absCaretCol;
145 final int modificationCount;
146 final boolean modified;
147 final Line line;
148
149 PostState(Editor editor)
150 {
151 final Line dotLine = editor.getDotLine();
152 dotLineNumber = dotLine.lineNumber();
153 dotOffset = editor.getDotOffset();
154 absCaretCol = editor.getAbsoluteCaretCol();
155 final Buffer buffer = editor.getBuffer();
156 modificationCount = buffer.getModCount();
157 modified = buffer.isModified();
158 line = dotLine.copy();
159 }
160
161 void restoreState(Editor editor)
163 {
164 final Buffer buffer = editor.getBuffer();
165
166 final Line before = editor.getDotLine().previous();
167 Line after = editor.getDotLine();
168 for (int i = 0; i < lines.size(); i++) {
169 after = after.next();
170 if (after == null)
171 break;
172 }
173
174 final Line restored = line.copy();
175 restored.setPrevious(before);
176 if (before != null)
177 before.setNext(restored);
178 else
179 buffer.setFirstLine(restored);
180 restored.setNext(after);
181 if (after != null)
182 after.setPrevious(restored);
183
185 buffer.setModCount(modificationCount);
186
187 buffer.needsRenumbering = true;
188 buffer.renumber();
189
190 editor.setDot(restored, dotOffset);
191 editor.setMark(null);
192 final Display display = editor.getDisplay();
193 display.setCaretCol(absCaretCol - display.getShift());
194 display.setUpdateFlag(REPAINT);
195 }
196 }
197 }
198 |
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