/**********************************************************************
Copyright (c) 2000, 2002 IBM Corp. and others.
All rights reserved. This program and the accompanying materials
are made available under the terms of the Common Public License v1.0
which accompanies this distribution, and is available at
http://www.eclipse.org/legal/cpl-v10.html

Contributors:
    IBM Corporation - Initial implementation
    Klaus Hartlage - www.eclipseproject.de
**********************************************************************/
package net.sourceforge.phpeclipse.phpeditor;

import net.sourceforge.phpeclipse.phpeditor.php.PHPWordExtractor;
import org.eclipse.jface.text.BadLocationException;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextHover;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.swt.graphics.Point;

/**
 * Example implementation for an <code>ITextHover</code> 
 * which hovers over PHP code.
 */
public class PHPTextHover implements ITextHover {
  private static PHPWordExtractor phpWordDetector = new PHPWordExtractor();
  /* (non-Javadoc)
   * Method declared on ITextHover
   */
  public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
    if (hoverRegion != null) {
      try {
        if (hoverRegion.getLength() > -1) {
          return textViewer.getDocument().get(hoverRegion.getOffset(), hoverRegion.getLength());
        }
      } catch (BadLocationException x) {
      }
    }
    return "empty selection";
  }

  /* (non-Javadoc)
   * Method declared on ITextHover
   */
  public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
    Point selection = PHPWordExtractor.findWord(textViewer.getDocument(), offset);
//  show the extracted word as a tooltip
    if (selection!=null && selection.x <= offset && offset < selection.x + selection.y)
      return new Region(selection.x, selection.y);
    return new Region(offset, 0);
  }
}