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Java > Open Source Codes > edu > rice > cs > drjava > model > definitions > indent > ActionStartPrevLinePlusMultilinePreserve


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45
46 package edu.rice.cs.drjava.model.definitions.indent;
47
48 import javax.swing.text.*;
49 import edu.rice.cs.util.UnexpectedException;
50 import edu.rice.cs.drjava.model.AbstractDJDocument;
51
52 /** Indents the current line in the document to the indent level of the
53   * start of the previous line, preserving any text on the current line,
54   * and adds several lines of text at that indent level,
55   * and moves the cursor to a particular line and position.
56   * @version $Id: ActionStartPrevLinePlusMultilinePreserve.java 3993 2006-09-02 20:23:38Z rcartwright $
57   */
58 class ActionStartPrevLinePlusMultilinePreserve extends IndentRuleAction {
59   private String JavaDoc[] _suffices;
60   private int _cursorLine, _cursorPos, _psrvLine, _psrvPos;
61
62   /** Creates a multiline insert rule, properly preserving any text on current line.
63     * @param suffices the new lines to be added
64     * @param cursorLine the line on which to place the cursor
65     * @param cursorPos the character within the line string before which to place
66     * the cursor
67     * @param psrvLine the line in suffices on which to place the preserved text
68     * @param psrvPos the character within the line string in suffices before which
69     * to place the preserved text
70     * @throws IllegalArgumentException if the integer params are negative or
71     * outside the appropriate bounds
72     */
73   public ActionStartPrevLinePlusMultilinePreserve(String JavaDoc suffices[],
74                                                   int cursorLine, int cursorPos,
75                                                   int psrvLine, int psrvPos) {
76     _suffices = suffices;
77     _cursorLine = cursorLine;
78     _cursorPos = cursorPos;
79     _psrvLine = psrvLine;
80     _psrvPos = psrvPos;
81   }
82
83   /**
84    * Forwards the call to the enclosed ActionStartPrevLinePlusMultiline _a
85    * @param doc AbstractDJDocument containing the line to be indented.
86    * @return this is always false, since we are updating the cursor location
87    */
88   public boolean indentLine(AbstractDJDocument doc, int reason) {
89     try {
90       // copy it so any changes are not remembered
91 String JavaDoc[] suffices = new String JavaDoc[_suffices.length];
92       for(int i = 0; i < _suffices.length; i++)
93         suffices[i] = _suffices[i];
94       
95       // get the absolute boundaries of the text on this line
96 int here = doc.getCurrentLocation();
97       int lineStart = doc.getLineStartPos(here);
98       int lineEnd = doc.getLineEndPos(here);
99
100       // cut the original text out of the current line
101 int lineLength = lineEnd-lineStart;
102       String JavaDoc preserved = doc.getText(lineStart, lineLength);
103       doc.remove(lineStart, lineLength);
104
105       // Paste the cut text in the correct place in the suffices array
106 String JavaDoc prefix = suffices[_psrvLine].substring(0,_psrvPos);
107       String JavaDoc suffix = suffices[_psrvLine].substring(_psrvPos);
108       suffices[_psrvLine] = prefix + preserved + suffix;
109
110       // forward the rest of the work to the other rule
111 ActionStartPrevLinePlusMultiline a;
112       //for(int i = 0; i < _suffices.length; i++)
113 // javax.swing.JOptionPane.showMessageDialog(null, "\""+suffices[i]+"\"", "suffices["+i+"]",javax.swing.JOptionPane.PLAIN_MESSAGE);;
114 a = new ActionStartPrevLinePlusMultiline(suffices, _cursorLine, _cursorPos);
115       return a.indentLine(doc, reason);
116     }
117     catch (BadLocationException e) {
118       // Shouldn't happen
119 throw new UnexpectedException(e);
120     }
121   }
122 }
123
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