bufferswitcher.java

Java写的文本编辑器

/*
 * BufferSwitcher.java - Status bar
 * Copyright (C) 2000 Slava Pestov
 *
 * 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.gjt.sp.jedit.gui;

import javax.swing.border.*;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import org.gjt.sp.jedit.textarea.JEditTextArea;
import org.gjt.sp.jedit.*;
import org.gjt.sp.util.*;

public class BufferSwitcher extends JComboBox
{
	public BufferSwitcher(EditPane editPane)
	{
		this.editPane = editPane;

		//setFont(new Font("Dialog",Font.BOLD,10));
		setRenderer(new BufferCellRenderer());
		setMaximumRowCount(10);
		addActionListener(new ActionHandler());
	}

	public void updateBufferList()
	{
		// if the buffer count becomes 0, then it is guaranteed to
		// become 1 very soon, so don't do anything in that case.
		if(jEdit.getBufferCount() == 0)
			return;

		updating = true;
		setModel(new DefaultComboBoxModel(jEdit.getBuffers()));
		setSelectedItem(editPane.getBuffer());
		updating = false;
	}

	// private members
	private EditPane editPane;
	private boolean updating;

	class ActionHandler implements ActionListener
	{
		public void actionPerformed(ActionEvent evt)
		{
			if(!updating)
			{
				Buffer buffer = (Buffer)getSelectedItem();
				if(buffer != null)
					editPane.setBuffer(buffer);
			}
		}
	}

	class BufferCellRenderer extends DefaultListCellRenderer
	{
		public Component getListCellRendererComponent(
			JList list, Object value, int index,
			boolean isSelected, boolean cellHasFocus)
		{
			super.getListCellRendererComponent(list,value,index,
				isSelected,cellHasFocus);
			Buffer buffer = (Buffer)value;
			if(buffer == null)
				setIcon(null);
			else
				setIcon(buffer.getIcon());
			return this;
		}
	}
}