Source Code : ModifyEvent: Temperature Converter JFace

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ModifyEvent: Temperature Converter JFace

/******************************************************************************
 * Copyright (c) 1998, 2004 Jackwind Li Guojie
 * All right reserved. 
 * 
 * Created on Jan 16, 2004 8:05:36 PM by JACK
 * $Id$
 * 
 * visit: http://www.asprise.com/swt
 *****************************************************************************/

import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

public class TemperatureConverterJFace extends ApplicationWindow {

  Label fahrenheitLabel;
  Label celsiusLabel;

  Text fahrenheitValue;
  Text celsiusValue;  
  
  public TemperatureConverterJFace() {
    super(null);
    
    addStatusLine();
  }

  /* (non-Javadoc)
   * @see org.eclipse.jface.window.Window#createContents(org.eclipse.swt.widgets.Composite)
   */
  protected Control createContents(Composite parent) {
    getShell().setText("JFace Temperature Converter");
    
    Composite converterComposite = new Composite(parent, SWT.NULL);
    
    converterComposite.setLayout(new GridLayout(4, false));

    fahrenheitLabel = new Label(converterComposite, SWT.NULL);
    fahrenheitLabel.setText("Fahrenheit: ");

    fahrenheitValue = new Text(converterComposite, SWT.SINGLE | SWT.BORDER);

    celsiusLabel = new Label(converterComposite, SWT.NULL);
    celsiusLabel.setText("Celsius: ");

    celsiusValue = new Text(converterComposite, SWT.SINGLE | SWT.BORDER);

    ModifyListener listener = new ModifyListener() {
      public void modifyText(ModifyEvent e) {
        valueChanged((Text) e.widget);
      }
    };

    fahrenheitValue.addModifyListener(listener);
    celsiusValue.addModifyListener(listener);
  
    return converterComposite;
  }

  /**
   * Performs conversion when one of the text fields changes.
   * 
   * @param text
   *            the event source
   */
  public void valueChanged(Text text) {
    if (!text.isFocusControl())
      return;

    if (text == fahrenheitValue) {
      try {
        double fValue = Double.parseDouble(text.getText());
        double cValue = (fValue - 32) / 1.8;
        celsiusValue.setText(Double.toString(cValue));
        System.out.println("F -> C: " + cValue);
        setStatus("Conversion performed successfully.");
      } catch (NumberFormatException e) {
        celsiusValue.setText("");
        setStatus("Invalid number format: " + text.getText());
      }
    } else {
      try {
        double cValue = Double.parseDouble(text.getText());
        double fValue = cValue * 1.8 + 32;
        fahrenheitValue.setText(Double.toString(fValue));
        System.out.println("C -> F: " + fValue);
        setStatus("Conversion performed successfully.");
      } catch (NumberFormatException e) {
        fahrenheitValue.setText("");
        setStatus("Invalid number format: " + text.getText());
      }
    }
  }
  
  public static void main(String[] args) {
    TemperatureConverterJFace converter = new TemperatureConverterJFace();
    converter.setBlockOnOpen(true);
    converter.open();
    Display.getCurrent().dispose();
  }
  
}


           
       

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