scrolldown.java

来自「java写的多功能文件编辑器」· Java 代码 · 共 47 行

/*
 * 01/13/2001 - 12:34:40
 *
 * ScrollDown.java - Scrolls down of a line without changing caret position
 * Copyright (C) 2001 Romain Guy
 * [e-mail]
 * www.jext.org
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

package org.jext.textarea;

import java.awt.event.ActionEvent;

import org.jext.*;
import org.gjt.sp.jedit.textarea.*;

public final class ScrollDown extends MenuAction
{
  public ScrollDown()
  {
    super("scroll_down");
  }

  public void actionPerformed(ActionEvent evt)
  {
    JEditTextArea textArea = getTextArea(evt);
    if (textArea.getFirstLine() < (textArea.getLineCount() - textArea.getVisibleLines()))
      textArea.setFirstLine(textArea.getFirstLine() + 1);
  }
}

// End of ScrollDown.java