01: package net.sourceforge.squirrel_sql.client.mainframe.action;
02:
03: /*
04: * Copyright (C) 2002 Colin Bell
05: * colbell@users.sourceforge.net
06: *
07: * This library is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU Lesser General Public
09: * License as published by the Free Software Foundation; either
10: * version 2.1 of the License, or (at your option) any later version.
11: *
12: * This library is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * Lesser General Public License for more details.
16: *
17: * You should have received a copy of the GNU Lesser General Public
18: * License along with this library; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20: */
21: import net.sourceforge.squirrel_sql.fw.gui.GUIUtils;
22: import net.sourceforge.squirrel_sql.fw.util.BaseException;
23: import net.sourceforge.squirrel_sql.fw.util.ICommand;
24:
25: import net.sourceforge.squirrel_sql.client.IApplication;
26: import net.sourceforge.squirrel_sql.client.gui.HelpViewerWindow;
27:
28: /**
29: * This <CODE>ICommand</CODE> displays the Help window.
30: *
31: * @author <A HREF="mailto:colbell@users.sourceforge.net">Colin Bell</A>
32: */
33: public class ViewHelpCommand implements ICommand {
34: /** Singleton instance of the help window. */
35: private static HelpViewerWindow s_window;
36:
37: /** Application API. */
38: private IApplication _app;
39:
40: /**
41: * Ctor.
42: *
43: * @param app Application API.
44: *
45: * @throws IllegalArgumentException
46: * Thrown if a <TT>null</TT> <TT>IApplication</TT> passed.
47: */
48: public ViewHelpCommand(IApplication app) {
49: super ();
50: if (app == null) {
51: throw new IllegalArgumentException(
52: "Null IApplication passed");
53: }
54: _app = app;
55: }
56:
57: /**
58: * Display the Help window
59: */
60: public void execute() throws BaseException {
61: synchronized (getClass()) {
62: if (s_window == null) {
63: s_window = new HelpViewerWindow(_app);
64: s_window.setSize(600, 400);
65: GUIUtils.centerWithinParent(s_window);
66: }
67: }
68: s_window.setVisible(true);
69: s_window.toFront(); // Required on Linux.
70: }
71:
72: }
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