package net.sourceforge.squirrel_sql.client.mainframe.action;
/*
* Copyright (C) 2002 Colin Bell
* colbell@users.sourceforge.net
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import net.sourceforge.squirrel_sql.fw.gui.GUIUtils;
import net.sourceforge.squirrel_sql.fw.util.BaseException;
import net.sourceforge.squirrel_sql.fw.util.ICommand;
import net.sourceforge.squirrel_sql.client.IApplication;
import net.sourceforge.squirrel_sql.client.gui.HelpViewerWindow;
/**
* This <CODE>ICommand</CODE> displays the Help window.
*
* @author <A HREF="mailto:colbell@users.sourceforge.net">Colin Bell</A>
*/
public class ViewHelpCommand implements ICommand
{
/** Singleton instance of the help window. */
private static HelpViewerWindow s_window;
/** Application API. */
private IApplication _app;
/**
* Ctor.
*
* @param app Application API.
*
* @throws IllegalArgumentException
* Thrown if a <TT>null</TT> <TT>IApplication</TT> passed.
*/
public ViewHelpCommand(IApplication app)
{
super();
if (app == null)
{
throw new IllegalArgumentException("Null IApplication passed");
}
_app = app;
}
/**
* Display the Help window
*/
public void execute() throws BaseException
{
synchronized (getClass())
{
if (s_window == null)
{
s_window = new HelpViewerWindow(_app);
s_window.setSize(600, 400);
GUIUtils.centerWithinParent(s_window);
}
}
s_window.setVisible(true);
s_window.toFront(); // Required on Linux.
}
}