edu.stanford.nlp.trees.tregex.gui.HighlightUtils Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of stanford-corenlp Show documentation

Stanford CoreNLP provides a set of natural language analysis tools which can take raw English language text input and give the base forms of words, their parts of speech, whether they are names of companies, people, etc., normalize dates, times, and numeric quantities, mark up the structure of sentences in terms of phrases and word dependencies, and indicate which noun phrases refer to the same entities. It provides the foundational building blocks for higher level text understanding applications.

There is a newer version: 4.5.7

Show newest version

package edu.stanford.nlp.trees.tregex.gui;

import java.awt.Color;
import java.awt.FontMetrics;
import java.awt.event.MouseEvent;

import javax.swing.JTextField;
import javax.swing.text.BadLocationException;
import javax.swing.text.DefaultHighlighter;
import javax.swing.text.Highlighter;
import javax.swing.text.Highlighter.Highlight;

public class HighlightUtils {
  //Non-instantiable
  private HighlightUtils() { }


  /**
   * Highlight the given label from the first mouse event to the second
   * Returns true if the highlight was successful, false otherwise.
   */
  public static boolean addHighlight(JTextField label, MouseEvent mouseEvent1, MouseEvent mouseEvent2) {
    FontMetrics fm = label.getFontMetrics(label.getFont());
    int firstXpos = mouseEvent1.getX();
    int lastXpos = mouseEvent2.getX();
    int firstOffset = getCharOffset(fm, label.getText(), firstXpos);
    int lastOffset = getCharOffset(fm, label.getText(), lastXpos);
    if(lastOffset != firstOffset) {
      if(firstOffset > lastOffset) {
        int tmp = firstOffset;
        firstOffset = lastOffset;
        lastOffset = tmp;
      }
      try {
        label.getHighlighter().removeAllHighlights();
        label.getHighlighter().addHighlight(firstOffset, lastOffset, new DefaultHighlighter.DefaultHighlightPainter(Color.yellow));
        return true;
      } catch (BadLocationException e1) {
        return false;
      }
    } else
      return false;
  }

  /**
   * Returns true if the given mouse event occurred within a highlight h on label.
   */
  public static boolean isInHighlight(MouseEvent e, JTextField label, Highlighter h) {
    Highlight[] hls = h.getHighlights();
    if(hls == null || hls.length == 0)
      return false;
    Highlight hl = hls[0];
    FontMetrics fm = label.getFontMetrics(label.getFont());
    int offset = getCharOffset(fm, label.getText(), e.getX());
    return hl.getStartOffset() <= offset && offset < hl.getEndOffset();
  }

  private static int getCharOffset(FontMetrics fm, String characters, int xPos) {
    StringBuilder s = new StringBuilder();
    char[] sArray = characters.toCharArray();
    int i;
    for(i = 0; i < characters.length() && fm.stringWidth(s.toString()) < xPos; i++) {
      s.append(sArray[i]);
    }
    return i;
  }

}