/*File Prob14 Copyright 2012 R.G.Baldwin
Old material:
This program services document events on the contents of
text fields containing color values.
The values are used to create a color swatch that displays
the color indicated by the color values in the red, green,
and blue text fields.
New material:
Demonstrates how to create and use a JColorChooser dialog.
Also demonstrates use of the darker and brigher methods.
Also demonstrates how to cause JTextField objects to be
non-editable.
*********************************************************/
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.JLabel;
import javax.swing.WindowConstants;
import javax.swing.event.DocumentListener;
import javax.swing.event.DocumentEvent;
import javax.swing.border.LineBorder;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Dimension;
import javax.swing.JColorChooser;
public class Prob14{
public static void main(String[] args){
new Prob14Runner();
}//end main method
}//end class Prob14
//======================================================//
class Prob14Runner extends JFrame{
private JPanel controlPanel = new JPanel();
private JPanel colorPanel = new JPanel();
private JPanel buttonPanel = new JPanel();
private JPanel colorIndicatorPanel = new JPanel();
private JTextField redField = new JTextField("000000");
private JTextField greenField =
new JTextField("000000");
private JTextField blueField = new JTextField("000000");
private int redInt = 0;
private int greenInt = 0;
private int blueInt = 0;
private JButton chooseButton =
new JButton("Choose Color");
private JButton brighterButton =
new JButton("Brighter");
private JButton darkerButton = new JButton("Darker");
//----------------------------------------------------//
public Prob14Runner(){//constructor
setDefaultCloseOperation(
WindowConstants.EXIT_ON_CLOSE);
controlPanel.setLayout(new GridLayout(2,1));
controlPanel.add(colorPanel);
controlPanel.add(buttonPanel);
colorPanel.setBackground(Color.GREEN);
colorPanel.add(new JLabel("Red = "));
colorPanel.add(redField);
colorPanel.add(new JLabel(" Green = "));
colorPanel.add(greenField);
colorPanel.add(new JLabel(" Blue = "));
colorPanel.add(blueField);
colorPanel.add(colorIndicatorPanel);
redField.setEditable(false);
greenField.setEditable(false);
blueField.setEditable(false);
colorIndicatorPanel.setBorder(
new LineBorder(Color.black,1));
colorIndicatorPanel.setPreferredSize(
new Dimension(20,20));
buttonPanel.setBackground(Color.BLUE);
buttonPanel.add(chooseButton);
buttonPanel.add(brighterButton);
buttonPanel.add(darkerButton);
//Color the swatch for the first time.
paintColorSwatch();
//Add the controlPanel to the content pane, adjust to
// the correct size, and set the title.
getContentPane().add(controlPanel);
pack();
setTitle("Dick Baldwin");
//Make the GUI visible
setVisible(true);
//--------------------------------------------------//
//Register listeners on the user input components.
//--------------------------------------------------//
chooseButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
Color selColor = JColorChooser.showDialog(
chooseButton,"Choose color",new Color(
redInt,greenInt,blueInt));
if(selColor != null){
//Don't change the color if the user cancels
// out.
redField.setText("" + selColor.getRed());
greenField.setText(
"" + selColor.getGreen());
blueField.setText("" + selColor.getBlue());
}//end if
}//end action performed
}//end new ActionListener
);//end addActionListener
//--------------------------------------------------//
darkerButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
Color color = new Color(
redInt,greenInt,blueInt).darker();
redField.setText("" + color.getRed());
greenField.setText("" + color.getGreen());
blueField.setText("" + color.getBlue());
}//end action performed
}//end newActionListener
);//end addActionListener
//--------------------------------------------------//
brighterButton.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
Color color = new Color(
redInt,greenInt,blueInt).brighter();
redField.setText("" + color.getRed());
greenField.setText("" + color.getGreen());
blueField.setText("" + color.getBlue());
}//end action performed
}//end newActionListener
);//end addActionListener
//--------------------------------------------------//
//Register a document listener on the red text field.
// This listener will respond when the contents of
// the text field are modified either by the program
// or by the user.
redField.getDocument().addDocumentListener(
new DocumentListener(){
public void changedUpdate(DocumentEvent e){
//Empty method - not needed
}//end changedUpdate
public void removeUpdate(DocumentEvent e){
try{
redInt = Integer.parseInt(
redField.getText());
if((redInt >= 0) && (redInt <= 255)){
paintColorSwatch();
}//end if
}catch(Exception ex){
//do nothing on exception
}//end catch
}//end removeUpdate
public void insertUpdate(DocumentEvent e){
try{
redInt = Integer.parseInt(
redField.getText());
if((redInt >= 0) && (redInt <= 255)){
paintColorSwatch();
}//end if
}catch(Exception ex){
//do nothing on exception
}//end catch
}//end insertUpdate
}//end new DocumentListener
);//end addDocumentListener
//--------------------------------------------------//
//Register a document listener on the green text
// field. Essentially the same as the above.
greenField.getDocument().addDocumentListener(
new DocumentListener(){
public void changedUpdate(DocumentEvent e){}
public void removeUpdate(DocumentEvent e){
try{
greenInt = Integer.parseInt(
greenField.getText());
if((greenInt >= 0) && (greenInt <= 255))
{
paintColorSwatch();
}//end if
}catch(Exception ex){
//do nothing on exception
}//end catch
}//end removeUpdate
public void insertUpdate(DocumentEvent e){
try{
greenInt = Integer.parseInt(
greenField.getText());
if((greenInt >= 0) && (greenInt <= 255))
{
paintColorSwatch();
}//end if
}catch(Exception ex){
//do nothing on exception
}//end catch
}//end insertUpdate
}//end new DocumentListener
);//end addDocumentListener
//--------------------------------------------------//
//Register a document listener on the blue text
// field. Essentially the same as the above.
blueField.getDocument().addDocumentListener(
new DocumentListener(){
public void changedUpdate(DocumentEvent e){}
public void removeUpdate(DocumentEvent e){
try{
blueInt = Integer.parseInt(
blueField.getText());
if((blueInt >= 0) && (blueInt <= 255)){
paintColorSwatch();
}//end if
}catch(Exception ex){
//do nothing on exception
}//end catch
}//end removeUpdate
public void insertUpdate(DocumentEvent e){
try{
blueInt = Integer.parseInt(
blueField.getText());
if((blueInt >= 0) && (blueInt <= 255)){
paintColorSwatch();
}//end if
}catch(Exception ex){
//do nothing on exception
}//end catch
}//end insertUpdate
}//end new DocumentListener
);//end addDocumentListener
//--------------------------------------------------//
}//end constructor
//----------------------------------------------------//
//The purpose of this method is to color a swatch
// located next to the RGB color values.
private void paintColorSwatch(){
colorIndicatorPanel.setBackground(
new Color(redInt,greenInt,blueInt));
}//end paintColorSwatch
//----------------------------------------------------//
//The purpose of this method is to absorb any exceptions
// that may be thrown by the parseInt method in order
// to avoid having the program abort. In the event that
// an exception is thrown, this method simply returns an
// int value of 0;
private int goParseInt(String string){
int result = 0;
try{
result = Integer.parseInt(string);
}catch(Exception e){
result = 0;
}//end catch
return result;
}//end goParseInt
//----------------------------------------------------//
}//end class Prob14Runner
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