/**************************************************************************
/* This class shows a simple GUI created with Swt
/*
/* Copyright (c) 2002 by Bernhard Bablok ([email protected])
/*
/* 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
/* (at your option) 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; see the file COPYING.  If not, write to
/* the Free Software Foundation Inc., 59 Temple Place - Suite 330,
/* Boston, MA  02111-1307 USA
/**************************************************************************/

import org.eclipse.swt.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.swt.events.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.graphics.*;

/**
  This class shows a simple GUI created with Swt

  @version $Revision: 1.1 $
  @author  $Author: Bablokb $
*/

public class SwtGui {

 private final int WINDOW_WIDTH = 300, WINDOW_HEIGHT = 200;

 private Display     iDisplay;
 private Shell       iMainWindow;
 private Composite   iInputPanel;
 private Label       iLabel;
 private Text        iTextArea;
 private Text        iEntryField;
 private Button      iButton;
 private Color       iColorWhite;

 //////////////////////////////////////////////////////////////////////////////

 /**
    Constructor.
 */

 public SwtGui() {
   iDisplay = new Display();
   iMainWindow = new Shell(iDisplay);
   iMainWindow.setText("SWT-Example");
   iColorWhite = new Color(iDisplay,255,255,255);
 }

 //////////////////////////////////////////////////////////////////////////////

 /**
    Create GUI using Swt.
 */

 private void createGUI() {
   FillLayout layout = new FillLayout();
   // layout.justify = true;
   // layout.pack = true;
   // layout.wrap = false;
   layout.type = SWT.VERTICAL;
   iMainWindow.setLayout(layout);
   iTextArea = new Text(iMainWindow,SWT.MULTI);
   iTextArea.setBackground(iColorWhite);
   createPanel();

   iMainWindow.setMenuBar(createMenuBar());
   iMainWindow.setSize(WINDOW_WIDTH,WINDOW_HEIGHT);
   Rectangle screenSize = iDisplay.getClientArea();
   iMainWindow.setLocation((screenSize.width - WINDOW_WIDTH)/2,
                           (screenSize.height - WINDOW_HEIGHT)/2);
   iEntryField.setFocus();
 }

 //////////////////////////////////////////////////////////////////////////////

 /**
    Create input panel using Swt.
 */

 private void createPanel() {
   iInputPanel = new Composite(iMainWindow,SWT.NULL);
   RowLayout layout = new RowLayout();
   layout.justify = true;
   layout.wrap = false;
   layout.type = SWT.HORIZONTAL;
   iInputPanel.setLayout(new RowLayout());

   iLabel     = new Label(iInputPanel,SWT.LEFT);
   iLabel.setText("Text: ");

   iEntryField = new Text(iInputPanel,SWT.SINGLE);
   iEntryField.setBackground(iColorWhite);

   iButton = new Button(iInputPanel,SWT.PUSH | SWT.CENTER);
   iButton.setText("Add");

   iButton.addSelectionListener(new SelectionAdapter() {
       public void widgetSelected(SelectionEvent e) {
         iTextArea.append(iEntryField.getText());
         iTextArea.append("\n");
       }
     }
   );
 }

 //////////////////////////////////////////////////////////////////////////////

 /**
    Create menu using Swt.
 */

 private Menu createMenuBar() {
   Menu mb = new Menu(iMainWindow,SWT.BAR);

   Menu fileMenu = new Menu(mb);
   MenuItem fileMenuItem = new MenuItem(mb,SWT.CASCADE);
   fileMenuItem.setText("File");
   fileMenuItem.setMenu(fileMenu);

   MenuItem exitItem = new MenuItem(fileMenu,SWT.PUSH);
   exitItem.setText("Exit");
   exitItem.addSelectionListener(new SelectionAdapter () {
       public void widgetSelected(SelectionEvent e) {
         exit();
       }
     });

   Menu helpMenu = new Menu(mb);
   MenuItem helpMenuItem = new MenuItem(mb,SWT.CASCADE);
   helpMenuItem.setText("Help");
   helpMenuItem.setMenu(helpMenu);

   MenuItem aboutItem = new MenuItem(helpMenu,SWT.PUSH);
   aboutItem.setText("About...");
   aboutItem.addSelectionListener(new SelectionAdapter() {
       public void widgetSelected(SelectionEvent e) {
         about();
       }
     }
   );
   return mb;
 }

 //////////////////////////////////////////////////////////////////////////////

 /**
    Close window and leave application.
 */

 void exit() {
   iMainWindow.setVisible(false);
   iMainWindow.dispose();
 }

 //////////////////////////////////////////////////////////////////////////////

 /**
    Show about-dialog.
 */

 void about() {
   MessageBox box = new MessageBox(iMainWindow,SWT.ICON_INFORMATION|SWT.OK);
   box.setText("About SWT-Example");
   box.setMessage("SWT-Example class: " + SwtGui.class.getName());
   box.open();
 }

 //////////////////////////////////////////////////////////////////////////////

 /**
    Main event loop
 */

 private void processLoop() {
   iMainWindow.open();
   while (!iMainWindow.isDisposed()) {
     if (!iDisplay.readAndDispatch())
       iDisplay.sleep();
   }
   iDisplay.dispose();
 }

 //////////////////////////////////////////////////////////////////////////////


 /**
    Main entry point
 */

 public static void main(String[] args) {
   SwtGui gui = new SwtGui();
   gui.createGUI();
   gui.processLoop();
 }
}

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