RE: [platform-swt-dev] SWT 101

["Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx>]

> From: Erik Poupaert
>
> Another remark to make is that this behaviour is natural. Imagine that
> setting the text of label would trigger the recalculation of its size, and
> trigger the recalculation of its container's size.

Don't want that.  I just want the label to get replaced.  Perhaps adding
GridLayouts will work.  In Swing, I don't have to do this.  Here's the same
program in Swing, which works exactly how I expect it to.  It's also 20
lines shorter.


SOURCE:

import java.util.Hashtable;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class PromptSwing {

  // Resources
  JFrame frame;
  JPanel panel;

  // Fields
  JTextField f1;
  JLabel f2;

  public PromptSwing() {
  }

  public void run() {
    init();
    setLayout();
    createWidgets();
    show();
  }

  private void init() {
    // Create a standard window
    frame = new JFrame("Swing Me");
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                doExit();
            }
        });
  }

  private void setLayout() {
    // Create the layout for the widgets
    panel = new JPanel();
    panel.setLayout(new GridLayout(3,2));
    frame.getContentPane().add(panel);
  }

  private void createWidgets() {
    // Create my widgets
    panel.add(new JLabel("Item Number:"));

    f1 = new JTextField(20);
    panel.add(f1);

    panel.add(new JLabel("Description:"));

    f2 = new JLabel();
    panel.add(f2);

    JButton b1 = new JButton("Find");
    panel.add(b1);
    b1.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        doFind();
      }
    });

    JButton b2 = new JButton("Exit");
    panel.add(b2);
    b2.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        doExit();
      }
    });

  }

  private void doFind() {
    String desc = getDescription(f1.getText());
    if (desc == null)
    {
      f1.setForeground(Color.WHITE);
      f1.setBackground(Color.RED);
      f2.setText("Not Found");
      f2.setForeground(Color.RED);
    }
    else
    {
      f1.setForeground(Color.BLACK);
      f1.setBackground(Color.WHITE);
      f2.setText(desc);
      f2.setForeground(Color.BLACK);
    }
  }

  private void doExit() {
    System.exit(0);
  }

  private static final Hashtable items;
  static {
    items = new Hashtable();
    items.put("DOG", "My Puppy");
    items.put("CAT", "My Kitty");
    items.put("OCTOPUS", "Calamari Kid");
  }

  private String getDescription(String item)
  {
    return (String) items.get(item);
  }

  private void show() {
    // Final setup - size the display show it
    frame.setSize(200, 100);
    frame.setVisible(true);
  }

  public static void main(String[] args) {
    new PromptSwing().run();
  }
}