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/jEdit/tags/jedit-4-2-pre4/org/gjt/sp/jedit/menu/EnhancedMenu.java

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Java | 188 lines | 120 code | 30 blank | 38 comment | 28 complexity | 2c0088672cbbba20d560abeff58334b9 MD5 | raw file
  1/*
  2 * EnhancedMenu.java - jEdit menu
  3 * :tabSize=8:indentSize=8:noTabs=false:
  4 * :folding=explicit:collapseFolds=1:
  5 *
  6 * Copyright (C) 2001, 2003 Slava Pestov
  7 *
  8 * This program is free software; you can redistribute it and/or
  9 * modify it under the terms of the GNU General Public License
 10 * as published by the Free Software Foundation; either version 2
 11 * of the License, or any later version.
 12 *
 13 * This program is distributed in the hope that it will be useful,
 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16 * GNU General Public License for more details.
 17 *
 18 * You should have received a copy of the GNU General Public License
 19 * along with this program; if not, write to the Free Software
 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 21 */
 22
 23package org.gjt.sp.jedit.menu;
 24
 25//{{{ Imports
 26import javax.swing.event.*;
 27import javax.swing.*;
 28import java.util.StringTokenizer;
 29import org.gjt.sp.jedit.msg.*;
 30import org.gjt.sp.jedit.*;
 31//}}}
 32
 33public class EnhancedMenu extends JMenu implements MenuListener
 34{
 35	//{{{ EnhancedMenu constructor
 36	public EnhancedMenu(String name)
 37	{
 38		this(name,jEdit.getProperty(name.concat(".label")),
 39			jEdit.getActionContext());
 40	} //}}}
 41
 42	//{{{ EnhancedMenu constructor
 43	public EnhancedMenu(String name, String label)
 44	{
 45		this(name,label,jEdit.getActionContext());
 46	} //}}}
 47
 48	//{{{ EnhancedMenu constructor
 49	public EnhancedMenu(String name, String label, ActionContext context)
 50	{
 51		this.context = context;
 52		if(label == null)
 53			label = name;
 54
 55		char mnemonic;
 56		int index = label.indexOf('$');
 57		if(index != -1 && label.length() - index > 1)
 58		{
 59			mnemonic = Character.toLowerCase(label.charAt(index + 1));
 60			label = label.substring(0,index).concat(label.substring(++index));
 61		}
 62		else
 63			mnemonic = '\0';
 64
 65		setText(label);
 66		if(!OperatingSystem.isMacOS())
 67			setMnemonic(mnemonic);
 68
 69		String menuItems = jEdit.getProperty(name);
 70		if(menuItems != null)
 71		{
 72			StringTokenizer st = new StringTokenizer(menuItems);
 73			while(st.hasMoreTokens())
 74			{
 75				String menuItemName = st.nextToken();
 76				if(menuItemName.equals("-"))
 77					addSeparator();
 78				else
 79					add(GUIUtilities.loadMenuItem(context,menuItemName,true));
 80			}
 81		}
 82
 83		initialComponentCount = getMenuComponentCount();
 84
 85		providerCode = jEdit.getProperty(name + ".code");
 86
 87		ebStub = new EditBusStub(name);
 88		ebStub.menuOutOfDate = true;
 89
 90		addMenuListener(this);
 91
 92		if(providerCode != null)
 93			EditBus.addToBus(ebStub);
 94	} //}}}
 95
 96	//{{{ menuSelected() method
 97	public void menuSelected(MenuEvent evt)
 98	{
 99		init();
100	} //}}}
101
102	public void menuDeselected(MenuEvent e) {}
103
104	public void menuCanceled(MenuEvent e) {}
105
106	//{{{ init() method
107	public void init()
108	{
109		if(providerCode == null)
110			return;
111
112		if(provider == null)
113		{
114			Object obj = BeanShell.eval(null,
115				BeanShell.getNameSpace(),
116				providerCode);
117			provider = (DynamicMenuProvider)obj;
118		}
119
120		if(provider == null)
121		{
122			// error
123			providerCode = null;
124			return;
125		}
126
127		if(ebStub.menuOutOfDate || provider.updateEveryTime())
128		{
129			ebStub.menuOutOfDate = false;
130
131			while(getMenuComponentCount() != initialComponentCount)
132				remove(getMenuComponentCount() - 1);
133
134			if(provider != null)
135				provider.update(this);
136		}
137	} //}}}
138
139	//{{{ Protected members
140	protected int initialComponentCount;
141	protected ActionContext context;
142
143	protected String providerCode;
144	protected DynamicMenuProvider provider;
145
146	protected EditBusStub ebStub;
147
148	//{{{ finalize() method
149	protected void finalize() throws Exception
150	{
151		if(ebStub != null)
152			EditBus.removeFromBus(ebStub);
153	} //}}}
154
155	//}}}
156
157	//{{{ EditBusStub class
158	/* EnhancedMenu has a reference to EditBusStub, but not the other
159	 * way around. So when the EnhancedMenu is being garbage collected
160	 * its finalize() method removes the EditBusStub from the edit bus. */
161	static class EditBusStub implements EBComponent
162	{
163		String name;
164		boolean menuOutOfDate;
165
166		EditBusStub(String name)
167		{
168			this.name = name;
169			menuOutOfDate = true;
170		}
171
172		public void handleMessage(EBMessage msg)
173		{
174			if(msg instanceof DynamicMenuChanged
175				&& name.equals(((DynamicMenuChanged)msg)
176				.getMenuName()))
177			{
178				menuOutOfDate = true;
179			}
180			else if(msg instanceof PropertiesChanged)
181			{
182				// while this might be questionable, some
183				// menus depend on properties
184				menuOutOfDate = true;
185			}
186		}
187	}
188}