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


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33
34 package edu.rice.cs.drjava.model.definitions.indent;
35
36 import javax.swing.text.*;
37 import edu.rice.cs.util.UnexpectedException;
38 import edu.rice.cs.drjava.model.AbstractDJDocument;
39
40 /**
41  * Indents the current line in the document to the indent level of the
42  * start of the previous line, plus the given suffix.
43  * @version $Id: ActionStartPrevLinePlus.java 3901 2006-06-30 05:28:11Z rcartwright $
44  */
45 class ActionStartPrevLinePlus extends IndentRuleAction {
46   private String JavaDoc _suffix;
47
48   /**
49    * Repeats the indentation from the previous line, plus a string
50    * @param suffix The string to be added
51    */
52   public ActionStartPrevLinePlus(String JavaDoc suffix) {
53     _suffix = suffix;
54   }
55
56   /**
57    * Indents the line according to the previous line, with the suffix string added.
58    * If on the first line, indent is set to 0.
59    * @param doc AbstractDJDocument containing the line to be indented.
60    * @return true if the caller should update the current location itself,
61    * false if the indenter has already handled this
62    */
63   public boolean indentLine(AbstractDJDocument doc, int reason) {
64     boolean supResult = super.indentLine(doc, reason);
65     try {
66       // Find start of line
67 int here = doc.getCurrentLocation();
68       int startLine = doc.getLineStartPos(here);
69
70       if (startLine > AbstractDJDocument.DOCSTART) {
71         // Find prefix of previous line
72 int startPrevLine = doc.getLineStartPos(startLine - 1);
73         int firstChar = doc.getLineFirstCharPos(startPrevLine);
74         String JavaDoc prefix = doc.getText(startPrevLine, firstChar - startPrevLine);
75         doc.setTab(prefix + _suffix, here);
76       }
77       else {
78         // On first line
79 doc.setTab(_suffix, here);
80       }
81       return supResult;
82     }
83     catch (BadLocationException e) {
84       // Shouldn't happen
85 throw new UnexpectedException(e);
86     }
87   }
88 }
89
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