markersmenu.java

Java写的文本编辑器

/*
 * MarkersMenu.java - Markers menu
 * 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;

import javax.swing.text.BadLocationException;
import javax.swing.text.Element;
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
import java.util.*;
import org.gjt.sp.jedit.*;
import org.gjt.sp.util.Log;

public class MarkersMenu extends EnhancedMenu
{
	public MarkersMenu()
	{
		super("markers");
	}

	public void setPopupMenuVisible(boolean b)
	{
		if(b)
		{
			final View view = EditAction.getView(this);

			if(getMenuComponentCount() != 0)
			{
				for(int i = getMenuComponentCount() - 1;
					i >= 0;
					i--)
				{
					Component comp = getMenuComponent(i);
					if(comp instanceof JSeparator)
						break;
					else
						remove(comp);
				}
			}

			Buffer buffer = view.getBuffer();
			Element map = buffer.getDefaultRootElement();

			Vector markers = buffer.getMarkers();

			if(markers.size() == 0)
			{
				JMenuItem mi = new JMenuItem(jEdit.getProperty(
					"no-markers.label"));
				mi.setEnabled(false);
				add(mi);
				super.setPopupMenuVisible(b);
				return;
			}

			JMenu current = this;

			for(int i = 0; i < markers.size(); i++)
			{
				final Marker marker = (Marker)markers.elementAt(i);
				int lineNo = map.getElementIndex(
					marker.getPosition());

				if(current.getItemCount() >= 20)
				{
					//current.addSeparator();
					JMenu newCurrent = new JMenu(
						jEdit.getProperty(
						"common.more"));
					current.add(newCurrent);
					current = newCurrent;
				}

				JMenuItem mi = new MarkersMenuItem(buffer,
					lineNo,marker.getShortcut());
				mi.addActionListener(new ActionListener()
				{
					public void actionPerformed(ActionEvent evt)
					{
						view.getTextArea().setCaretPosition(
							marker.getPosition());
					}
				});
				current.add(mi);
			}
		}

		super.setPopupMenuVisible(b);
	}

	static class MarkersMenuItem extends JMenuItem
	{
		MarkersMenuItem(Buffer buffer, int lineNo, char shortcut)
		{
			Element line = buffer.getDefaultRootElement()
				.getElement(lineNo);

			try
			{
				int start = line.getStartOffset();
				String text = buffer.getText(start,
					line.getEndOffset() - start - 1);
				text = text.trim();
				if(text.length() == 0)
					text = jEdit.getProperty("markers.blank-line");
				setText(lineNo + ": " + text);
			}
			catch(BadLocationException ble)
			{
				Log.log(Log.ERROR,this,ble);
			}

			shortcutProp = "goto-marker.shortcut";
			MarkersMenuItem.this.shortcut = shortcut;
		}

		public Dimension getPreferredSize()
		{
			Dimension d = super.getPreferredSize();

			String shortcut = getShortcut();

			if(shortcut != null)
			{
				d.width += (getFontMetrics(acceleratorFont)
					.stringWidth(shortcut) + 10);
			}
			return d;
		}

		public void paint(Graphics g)
		{
			super.paint(g);

			String shortcut = getShortcut();

			if(shortcut != null)
			{
				g.setFont(acceleratorFont);
				g.setColor(getModel().isArmed() ?
					acceleratorSelectionForeground :
					acceleratorForeground);
				FontMetrics fm = g.getFontMetrics();
				Insets insets = getInsets();
				g.drawString(shortcut,getWidth() - (fm.stringWidth(
					shortcut) + insets.right + insets.left),
					getFont().getSize() + (insets.top - 1)
					/* XXX magic number */);
			}
		}

		// private members
		private String shortcutProp;
		private char shortcut;
		private static Font acceleratorFont;
		private static Color acceleratorForeground;
		private static Color acceleratorSelectionForeground;

		private String getShortcut()
		{
			if(shortcut == '\0')
				return null;
			else
			{
				String shortcutPrefix = jEdit.getProperty(shortcutProp);

				if(shortcutPrefix == null)
					return null;
				else
				{
					return shortcutPrefix + " " + shortcut;
				}
			}
		}

		static
		{
			acceleratorFont = UIManager.getFont("MenuItem.acceleratorFont");
			acceleratorFont = new Font("Monospaced",
				acceleratorFont.getStyle(),
				acceleratorFont.getSize());
			acceleratorForeground = UIManager
				.getColor("MenuItem.acceleratorForeground");
			acceleratorSelectionForeground = UIManager
				.getColor("MenuItem.acceleratorSelectionForeground");
		}
	}
}