deyou
96 lines
2.3 KiB
Java
96 lines
2.3 KiB
Java
import java.awt.*;
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import javax.swing.*;
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import javax.swing.event.*;
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/**
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* @version 1.40 2007-08-05
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* @author Cay Horstmann
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*/
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public class ChangeTrackingTest
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{
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public static void main(String[] args)
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{
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EventQueue.invokeLater(new Runnable()
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{
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public void run()
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{
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ColorFrame frame = new ColorFrame();
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setVisible(true);
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}
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});
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}
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}
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/**
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* A frame with three text fields to set the background color.
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*/
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class ColorFrame extends JFrame
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{
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public ColorFrame()
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{
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setTitle("ChangeTrackingTest");
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DocumentListener listener = new DocumentListener()
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{
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public void insertUpdate(DocumentEvent event)
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{
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setColor();
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}
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public void removeUpdate(DocumentEvent event)
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{
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setColor();
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}
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public void changedUpdate(DocumentEvent event)
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{
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}
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};
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panel = new JPanel();
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panel.add(new JLabel("Red:"));
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redField = new JTextField("255", 3);
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panel.add(redField);
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redField.getDocument().addDocumentListener(listener);
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panel.add(new JLabel("Green:"));
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greenField = new JTextField("255", 3);
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panel.add(greenField);
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greenField.getDocument().addDocumentListener(listener);
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panel.add(new JLabel("Blue:"));
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blueField = new JTextField("255", 3);
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panel.add(blueField);
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blueField.getDocument().addDocumentListener(listener);
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add(panel);
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pack();
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}
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/**
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* Set the background color to the values stored in the text fields.
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*/
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public void setColor()
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{
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try
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{
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int red = Integer.parseInt(redField.getText().trim());
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int green = Integer.parseInt(greenField.getText().trim());
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int blue = Integer.parseInt(blueField.getText().trim());
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panel.setBackground(new Color(red, green, blue));
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}
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catch (NumberFormatException e)
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{
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// don't set the color if the input can't be parsed
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}
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}
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private JPanel panel;
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private JTextField redField;
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private JTextField greenField;
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private JTextField blueField;
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}
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