errorlistcellrenderer.java

用java 编写的源码开放的文本编辑器。有很多有用的特性

/*
 * ErrorListCellRenderer.java - Used to list I/O and plugin load errors
 * :tabSize=8:indentSize=8:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * Copyright (C) 2001 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;

//{{{ Imports
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
//}}}

class ErrorListCellRenderer extends JComponent implements ListCellRenderer
{
	//{{{ ErrorListCellRenderer constructor
	ErrorListCellRenderer()
	{
		plainFont = UIManager.getFont("Label.font");
		boldFont = new Font(plainFont.getName(),Font.BOLD,plainFont.getSize());
		plainFM = getFontMetrics(plainFont);
		boldFM = getFontMetrics(boldFont);

		setBorder(new EmptyBorder(2,2,2,2));
	} //}}}

	//{{{ getListCellRendererComponent() method
	public Component getListCellRendererComponent(JList list, Object value,
		int index, boolean isSelected, boolean cellHasFocus)
	{
		ErrorListDialog.ErrorEntry entry = (ErrorListDialog.ErrorEntry)value;
		this.path = entry.path + ":";
		this.messages = entry.messages;
		return this;
	} //}}}

	//{{{ getPreferredSize() method
	public Dimension getPreferredSize()
	{
		int width = boldFM.stringWidth(path);
		int height = boldFM.getHeight();
		for(int i = 0; i < messages.length; i++)
		{
			width = Math.max(plainFM.stringWidth(messages[i]),width);
			height += plainFM.getHeight();
		}

		Insets insets = getBorder().getBorderInsets(this);
		width += insets.left + insets.right;
		height += insets.top + insets.bottom;

		return new Dimension(width,height);
	} //}}}

	//{{{ paintComponent() method
	public void paintComponent(Graphics g)
	{
		Insets insets = getBorder().getBorderInsets(this);
		g.setFont(boldFont);
		g.drawString(path,insets.left,insets.top + boldFM.getAscent());
		int y = insets.top + boldFM.getHeight() + 2;
		g.setFont(plainFont);
		for(int i = 0; i < messages.length; i++)
		{
			g.drawString(messages[i],insets.left,y + plainFM.getAscent());
			y += plainFM.getHeight();
		}
	} //}}}

	//{{{ Instance variables
	private String path;
	private String[] messages;
	private Font plainFont;
	private Font boldFont;
	private FontMetrics plainFM;
	private FontMetrics boldFM;
	//}}}
}