Source Code : Text Event

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Text Event

/******************************************************************************
 * Copyright (c) 1998, 2004 Jackwind Li Guojie
 * All right reserved. 
 * 
 * Created on Jan 16, 2004 1:23:25 AM by JACK
 * $Id$
 * 
 * visit: http://www.asprise.com/swt
 *****************************************************************************/

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;

public class TemperatureConverter {
  Display display = new Display();
  Shell shell = new Shell(display);

  Label fahrenheitLabel;
  Label celsiusLabel;
  Label messageLabel;

  Text fahrenheitValue;
  Text celsiusValue;

  public TemperatureConverter() {
    shell.setText("SWT Temperature Converter");
    shell.setLayout(new GridLayout(4, false));

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

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

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

    celsiusValue = new Text(shell, SWT.SINGLE | SWT.BORDER);
    
    messageLabel = new Label(shell, SWT.BORDER);
    GridData gridData = new GridData(GridData.FILL_BOTH);
    gridData.horizontalSpan = 4;
    messageLabel.setLayoutData(gridData);

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

    fahrenheitValue.addModifyListener(listener);
    celsiusValue.addModifyListener(listener);

    shell.pack();
    shell.open();

    // Set up the event loop.
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        // If no more entries in event queue
        display.sleep();
      }
    }

    display.dispose();
  }

  /**
   * 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);
        messageLabel.setText("Conversion performed successfully.");
      } catch (NumberFormatException e) {
        celsiusValue.setText("");
        messageLabel.setText("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);
        messageLabel.setText("Conversion performed successfully.");
      } catch (NumberFormatException e) {
        fahrenheitValue.setText("");
        messageLabel.setText("Invalid number format: " + text.getText());
      }
    }
  }

  public static void main(String[] args) {
    new TemperatureConverter();
  }
}


           
       

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