diff options
Diffstat (limited to 'libjava/classpath/javax/swing/text/Utilities.java')
-rw-r--r-- | libjava/classpath/javax/swing/text/Utilities.java | 66 |
1 files changed, 59 insertions, 7 deletions
diff --git a/libjava/classpath/javax/swing/text/Utilities.java b/libjava/classpath/javax/swing/text/Utilities.java index f154e55..36361f4 100644 --- a/libjava/classpath/javax/swing/text/Utilities.java +++ b/libjava/classpath/javax/swing/text/Utilities.java @@ -43,6 +43,9 @@ import java.awt.Graphics; import java.awt.Point; import java.text.BreakIterator; +import javax.swing.SwingConstants; +import javax.swing.text.Position.Bias; + /** * A set of utilities to deal with text. This is used by several other classes * inside this package. @@ -337,7 +340,7 @@ public class Utilities // location or is not whitespace (meaning it is a number or // punctuation). The first case means that 'last' denotes the // beginning of a word while the second case means it is the start - // of some else. + // of something else. if (Character.isLetter(cp) || !Character.isWhitespace(cp)) return last; @@ -346,7 +349,7 @@ public class Utilities current = wb.next(); } - throw new BadLocationException("no more word", offs); + throw new BadLocationException("no more words", offs); } /** @@ -363,24 +366,36 @@ public class Utilities public static final int getPreviousWord(JTextComponent c, int offs) throws BadLocationException { - if (offs < 0 || offs > (c.getText().length() - 1)) - throw new BadLocationException("invalid offset specified", offs); String text = c.getText(); + + if (offs <= 0 || offs > text.length()) + throw new BadLocationException("invalid offset specified", offs); + BreakIterator wb = BreakIterator.getWordInstance(); wb.setText(text); int last = wb.preceding(offs); int current = wb.previous(); + int cp; while (current != BreakIterator.DONE) { for (int i = last; i < offs; i++) { - if (Character.isLetter(text.codePointAt(i))) + cp = text.codePointAt(i); + + // Return the last found bound if there is a letter at the current + // location or is not whitespace (meaning it is a number or + // punctuation). The first case means that 'last' denotes the + // beginning of a word while the second case means it is the start + // of some else. + if (Character.isLetter(cp) + || !Character.isWhitespace(cp)) return last; } last = current; current = wb.previous(); } + return 0; } @@ -394,14 +409,17 @@ public class Utilities public static final int getWordStart(JTextComponent c, int offs) throws BadLocationException { - if (offs < 0 || offs >= c.getText().length()) + String text = c.getText(); + + if (offs < 0 || offs > text.length()) throw new BadLocationException("invalid offset specified", offs); - String text = c.getText(); BreakIterator wb = BreakIterator.getWordInstance(); wb.setText(text); + if (wb.isBoundary(offs)) return offs; + return wb.preceding(offs); } @@ -674,4 +692,38 @@ public class Utilities else return offs+1; } + + /** This is an internal helper method which is used by the + * <code>javax.swing.text</code> package. It simply delegates the + * call to a method with the same name on the <code>NavigationFilter</code> + * of the provided <code>JTextComponent</code> (if it has one) or its UI. + * + * If the underlying method throws a <code>BadLocationException</code> it + * will be swallowed and the initial offset is returned. + */ + static int getNextVisualPositionFrom(JTextComponent t, int offset, int direction) + { + NavigationFilter nf = t.getNavigationFilter(); + + try + { + return (nf != null) + ? nf.getNextVisualPositionFrom(t, + offset, + Bias.Forward, + direction, + null) + : t.getUI().getNextVisualPositionFrom(t, + offset, + Bias.Forward, + direction, + null); + } + catch (BadLocationException ble) + { + return offset; + } + + } + } |