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JPanel doesn't react to MouseEvents?

I'm trying to create a "Tic Tac Toe" game. I've chosen to create a variation of JPanel to represent each square. The class beneath represents one of 9 panels that together make up my game board.
Now the problem I'm having is that when I click the panel a 'X' should be displayed inside of the panel, but nothing happens. I'd very much appreciate it if someone steered me in the right direction.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TicTacToePanel extends JPanel implements MouseListener {
private boolean isPlayer1Turn = true;
private boolean isUsed = false;
private JLabel ticTacLbl = new JLabel();
public TicTacToePanel() {
setBorder(BorderFactory.createLineBorder(Color.BLACK));
addMouseListener(this);
}
public void mouseClicked(MouseEvent e) {
if (!isUsed) {
if (isPlayer1Turn) {
ticTacLbl.setForeground(Color.red);
ticTacLbl.setText("X");
add(ticTacLbl, 0);
isUsed = true;
} else {
ticTacLbl.setForeground(Color.blue);
ticTacLbl.setText("O");
add(ticTacLbl, 0);
isUsed = true;
}
} else {
}
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public static void main(String[] args) {
JOptionPane.showMessageDialog(null, new TicTacToePanel());
}
}
EDIT:
I simply added my label component in the constructor of my TicTacToePanel so that I no longer have to call revalidate() and I'm not adding components during runtime.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TicTacToePanel extends JPanel implements MouseListener{
private boolean isPlayer1Turn = true;
private boolean isUsed = false;
private JLabel ticTacLbl = new JLabel();
public TicTacToePanel(){
add(ticTacLbl, 0);
setBorder(BorderFactory.createLineBorder(Color.BLACK));
addMouseListener(this);
}
public void mouseClicked(MouseEvent e){
}
public void mousePressed(MouseEvent e){
if (!isUsed) {
if (isPlayer1Turn) {
ticTacLbl.setForeground(Color.red);
ticTacLbl.setText("X");
isUsed = true;
} else {
ticTacLbl.setForeground(Color.blue);
ticTacLbl.setText("O");
isUsed = true;
}
}
else{
}
}
public void mouseReleased(MouseEvent e){
}
public void mouseEntered(MouseEvent e){
}
public void mouseExited(MouseEvent e){
}
public static void main(String[] args){
JOptionPane.showMessageDialog(null, new TicTacToePanel());
}
}
The GUI constructor:
public TicTacToeGUI(int gameMode){
if(gameMode == 0){
amountOfPanels = 9;
TicTacToePanel[] panelArr = new TicTacToePanel[amountOfPanels];
add(gamePanel, new GridLayout(3, 3));
setPreferredSize(new Dimension(100, 100));
for(int i = 0; i < amountOfPanels; i++){
panelArr[i] = new TicTacToePanel();
gamePanel.add(panelArr[i]);
}
}
else if(gameMode == 1){
amountOfPanels = 225;
TicTacToePanel[] panelArr = new TicTacToePanel[amountOfPanels];
add(gamePanel, new GridLayout(15, 15));
setPreferredSize(new Dimension(500, 500));
for(int i = 0; i < amountOfPanels; i++){
panelArr[i] = new TicTacToePanel();
gamePanel.add(panelArr[i]);
}
}
}
public static void main(String[] args){
JOptionPane.showMessageDialog(null, new TicTacToeGUI(0));
}
}

When you add/remove components at runtime, always call revalidate() afterwards. revalidate() makes the component refresh/relayout.
So just call revalidate() after you add the label and it will work.

If you're goal is to create a Tic Tac Toe game, then you may wish to re-think your current strategy of adding components to the GUI on the fly. Much better would be to create a grid of components, say of JLabel, and place them on the JPanel at program start up. This way you can change the pressed JLabel's text and color, and even its Icon if you want to be fancy during program run without having to add or remove components. For example:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
#SuppressWarnings("serial")
public class TicTacToePanel extends JPanel {
private static final int ROWS = 3;
private static final int MY_C = 240;
private static final Color BG = new Color(MY_C, MY_C, MY_C);
private static final int PTS = 60;
private static final Font FONT = new Font(Font.SANS_SERIF, Font.BOLD, PTS);
public static final Color X_COLOR = Color.BLUE;
public static final Color O_COLOR = Color.RED;
private JLabel[][] labels = new JLabel[ROWS][ROWS];
private boolean xTurn = true;
public TicTacToePanel() {
setLayout(new GridLayout(ROWS, ROWS, 2, 2));
setBackground(Color.black);
MyMouse myMouse = new MyMouse();
for (int row = 0; row < labels.length; row++) {
for (int col = 0; col < labels[row].length; col++) {
JLabel label = new JLabel(" ", SwingConstants.CENTER);
label.setOpaque(true);
label.setBackground(BG);
label.setFont(FONT);
add(label);
label.addMouseListener(myMouse);
}
}
}
private class MyMouse extends MouseAdapter {
#Override // override mousePressed not mouseClicked
public void mousePressed(MouseEvent e) {
JLabel label = (JLabel) e.getSource();
String text = label.getText().trim();
if (!text.isEmpty()) {
return;
}
if (xTurn) {
label.setForeground(X_COLOR);
label.setText("X");
} else {
label.setForeground(O_COLOR);
label.setText("O");
}
// information to help check for win
int chosenX = -1;
int chosenY = -1;
for (int x = 0; x < labels.length; x++) {
for (int y = 0; y < labels[x].length; y++) {
if (labels[x][y] == label) {
chosenX = x;
chosenY = y;
}
}
}
// TODO: check for win here
xTurn = !xTurn;
}
}
private static void createAndShowGui() {
TicTacToePanel mainPanel = new TicTacToePanel();
JFrame frame = new JFrame("Tic Tac Toe");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}

How to find JLabel that was clicked and show ImageIcon from it?

Here is my code. I want to know which l was clicked and then in a new frame, display that ImageIcon.
The e.getSource() is not working...
final JFrame shirts = new JFrame("T-shirts");
JPanel panel = new JPanel(new GridLayout(4, 4, 3, 3));
for (int i = 1; i < 13; i++) {
l = new JLabel(new ImageIcon("T-shirts/"+i+".jpg"), JLabel.CENTER);
l.setBorder(BorderFactory.createBevelBorder(BevelBorder.RAISED));
l.setFont(l.getFont().deriveFont(20f));
panel.add(l);
}//end of for loop
panel.addMouseListener(new MouseAdapter(){
public void mouseClicked(MouseEvent e)
{
sizes = new JFrame("Shopping");
sizes.setVisible(true);
sizes.setSize(500, 500);
sizes.setLocation(100,200);
shirts.dispose();
if(e.getSource()==l){//FIX
sizes.add(l);
}//end of if
}
});
shirts.setContentPane(panel);
shirts.setSize(1000, 1000);
shirts.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
shirts.setVisible(true);

If you add your MouseListener directly to your JLabels, then you can display the pressed label's icon easily in a JOptionPane:
#Override
public void mousePressed(MouseEvent mEvt) {
JLabel label = (JLabel) mEvt.getSource();
Icon icon = label.getIcon();
JOptionPane.showMessageDialog(label, icon);
}
For example:
import java.awt.GridLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.swing.*;
public class FooMouseListener extends JPanel {
private GetImages getImages;
public FooMouseListener() throws IOException {
getImages = new GetImages();
setLayout(new GridLayout(GetImages.SPRITE_ROWS, GetImages.SPRITE_COLS));
MyMouseAdapter myMouseAdapter = new MyMouseAdapter();
for (int i = 0; i < GetImages.SPRITE_CELLS; i++) {
JLabel label = new JLabel(getImages.getIcon(i));
add(label);
label.addMouseListener(myMouseAdapter);
}
}
private class MyMouseAdapter extends MouseAdapter {
#Override
public void mousePressed(MouseEvent e) {
JLabel label = (JLabel) e.getSource();
Icon icon = label.getIcon();
JOptionPane.showMessageDialog(label, icon, "Selected Icon", JOptionPane.PLAIN_MESSAGE);
}
}
private static void createAndShowGui() {
FooMouseListener mainPanel = null;
try {
mainPanel = new FooMouseListener();
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
JFrame frame = new JFrame("FooMouseListener");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
class GetImages {
private static final String SPRITE_PATH = "http://th02.deviantart.net/"
+ "fs70/PRE/i/2011/169/0/8/blue_player_sprite_sheet_by_resetado-d3j7zba.png";
public static final int SPRITE_ROWS = 6;
public static final int SPRITE_COLS = 6;
public static final int SPRITE_CELLS = SPRITE_COLS * SPRITE_ROWS;
private List<Icon> iconList = new ArrayList<>();
public GetImages() throws IOException {
URL imgUrl = new URL(SPRITE_PATH);
BufferedImage mainImage = ImageIO.read(imgUrl);
for (int i = 0; i < SPRITE_CELLS; i++) {
int row = i / SPRITE_COLS;
int col = i % SPRITE_COLS;
int x = (int) (((double) mainImage.getWidth() * col) / SPRITE_COLS);
int y = (int) ((double) (mainImage.getHeight() * row) / SPRITE_ROWS);
int w = (int) ((double) mainImage.getWidth() / SPRITE_COLS);
int h = (int) ((double) mainImage.getHeight() / SPRITE_ROWS);
BufferedImage img = mainImage.getSubimage(x, y, w, h);
ImageIcon icon = new ImageIcon(img);
iconList.add(icon);
}
}
// get the Icon from the List at index position
public Icon getIcon(int index) {
if (index < 0 || index >= iconList.size()) {
throw new ArrayIndexOutOfBoundsException(index);
}
return iconList.get(index);
}
public int getIconListSize() {
return iconList.size();
}
}

Have you tried this?
public void mouseClicked(MouseEvent e)
{
sizes = new JFrame("Shopping");
sizes.add(l);
sizes.setVisible(true);
sizes.setSize(500, 500);
sizes.setLocation(100,200);
shirts.dispose();
//Remove the "e.getSource()" part.
}
It will automatically display the image, because you are assigning the Image Name to it, in the same segment as the Addition to the new JFrame.
Let me know of the outcome

Is java swing not working in java 8 update 45?

The following code is working in jdk 1.8 update 45 and in java 1.8 update 31 but NOT in java 1.8 update 45.
The program is a button moving back and forth until the user presses the button and makes it stop and the text is changed to "MOVE". When the button is pressed again, the button starts moving and the text is changed to "STOP".
In java 8 update 45, the button does not start moving but the text changes. Why?
package mainpackage;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class mainPanel implements ActionListener {
JFrame frame1;
JPanel panel1;
JButton button = new JButton("STOP");
boolean buttonPressed = false;
boolean move = true;
// 0 = left & 1 = right
int direction = 1;
int x = 0;
public static void main(String[] args) {
new mainPanel().loadGUI();
}
public void loadGUI() {
frame1 = new JFrame("Moving button");
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.setVisible(true);
frame1.setSize(300, 58);
frame1.setResizable(false);
panel1 = new JPanel(); // Xwidth=294, Yheight=272
panel1.setSize(300, 30);
panel1.setLayout(null);
frame1.add(panel1);
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
frame1.setLocation(dim.width/2-frame1.getSize().width/2, dim.height/2-frame1.getSize().height/2);
button.setSize(80, 30); //X, Y
panel1.add(button);
button.addActionListener(this);
while(true) moveButton();
}
public void moveButton() {
while(move == true) {
switch(direction) {
// left
case 0: {
while(x > 0) {
if(move == false) break;
button.setLocation(x, 0);
x--;
panel1.repaint();
try {
Thread.sleep(10);
} catch (InterruptedException ex) {
Logger.getLogger(mainPanel.class.getName()).log(Level.SEVERE, null, ex);
}
}
if(buttonPressed == true) {
direction = 0;
buttonPressed = false;
} else if(buttonPressed == false) {
direction = 1;
buttonPressed = false;
}
}
// right
case 1: {
while(x < panel1.getWidth() - button.getWidth()) {
if(move == false) break;
button.setLocation(x, 0);
x++;
panel1.repaint();
try {
Thread.sleep(10);
} catch (InterruptedException ex) {
Logger.getLogger(mainPanel.class.getName()).log(Level.SEVERE, null, ex);
}
}
if(buttonPressed == true) {
direction = 1;
buttonPressed=false;
} else if(buttonPressed == false) {
direction=0;
buttonPressed=false;
}
}
}
}
}
#Override
public void actionPerformed(ActionEvent e) {
if (move == true){
move=false;
} else if (move == false) {
move=true;
}
buttonPressed = true;
if((button.getText()).equals("STOP")) {
button.setText("MOVE");
} else button.setText("STOP");
}
}

Yours is broken code to begin with since it ignores Swing threading rules, and frankly I'm surprised that it worked in previous versions of Java. You're calling a while (true) loop that will tie up any thread that it is called in. Java 8 is correctly trying to start your Swing GUI on the Swing event thread, something that all Swing programs should do. If you get rid of the while (true) loops that risk being called on the Swing event dispatch thread, and instead use a Swing Timer your code should work. The Timer will run a loop in a background thread, but all code called repeatedly in its ActionListener will be called on the Swing event thread.
For example:
import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class MyMainPanel extends JPanel {
private static final int PREF_W = 300;
private static final int PREF_H = 30;
private static final int TIMER_DELAY = 20;
public static final int DELTA_X = 3;
private JButton moveButton = new JButton(new MoveButtonAction("Move"));
private Timer moveTimer = new Timer(TIMER_DELAY, new MoveTimerListener());
private boolean moveRight = true;
public MyMainPanel() {
moveButton.setSize(moveButton.getPreferredSize());
int y = (getPreferredSize().height - moveButton.getPreferredSize().height) / 2;
moveButton.setLocation(0, y);
setLayout(null); // !! lord I hate this
add(moveButton);
moveTimer.start();
}
#Override
public Dimension getPreferredSize() {
Dimension superSz = super.getPreferredSize();
if (isPreferredSizeSet()) {
return superSz;
}
int prefW = Math.max(superSz.width, PREF_W);
int prefH = Math.max(superSz.height, PREF_H);
return new Dimension(prefW, prefH);
}
private class MoveButtonAction extends AbstractAction {
public MoveButtonAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
#Override
public void actionPerformed(ActionEvent e) {
moveRight = !moveRight;
}
}
private class MoveTimerListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
if (moveRight) {
if (moveButton.getLocation().x + moveButton.getWidth() >= getWidth()) {
moveRight = false;
}
} else {
if (moveButton.getLocation().x <= 0) {
moveRight = true;
}
}
int x = moveButton.getLocation().x + (moveRight ? DELTA_X : -DELTA_X);
int y = moveButton.getLocation().y;
moveButton.setLocation(new Point(x, y));
repaint();
}
}
private static void createAndShowGui() {
MyMainPanel mainPanel = new MyMainPanel();
JFrame frame = new JFrame("GUI Example");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
You will want to read up on Swing thread safety to see why your program is failing. See Lesson: Concurrency in Swing to see more on this.
Edit: code that stops and starts movement:
import java.awt.Dimension;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
#SuppressWarnings("serial")
public class MyMainPanel extends JPanel {
private static final String MOVE = "Move";
private static final String STOP = "Stop";
private static final int PREF_W = 300;
private static final int PREF_H = 30;
private static final int TIMER_DELAY = 20;
public static final int DELTA_X = 3;
private MoveButtonAction moveButtonAction = new MoveButtonAction(STOP);
private JButton moveButton = new JButton(moveButtonAction);
private Timer moveTimer = new Timer(TIMER_DELAY, new MoveTimerListener());
private boolean moveRight = true;
public MyMainPanel() {
moveButton.setSize(moveButton.getPreferredSize());
int y = (getPreferredSize().height - moveButton.getPreferredSize().height) / 2;
moveButton.setLocation(0, y);
setLayout(null); // !! lord I hate this
add(moveButton);
moveTimer.start();
}
#Override
public Dimension getPreferredSize() {
Dimension superSz = super.getPreferredSize();
if (isPreferredSizeSet()) {
return superSz;
}
int prefW = Math.max(superSz.width, PREF_W);
int prefH = Math.max(superSz.height, PREF_H);
return new Dimension(prefW, prefH);
}
private class MoveButtonAction extends AbstractAction {
public MoveButtonAction(String name) {
super(name);
int mnemonic = (int) name.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
#Override
public void actionPerformed(ActionEvent e) {
if (MOVE.equals(getValue(NAME))) {
moveTimer.start();
putValue(NAME, STOP);
int mnemonic = (int) STOP.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
} else {
moveTimer.stop();
putValue(NAME, MOVE);
int mnemonic = (int) MOVE.charAt(0);
putValue(MNEMONIC_KEY, mnemonic);
}
AbstractButton button = (AbstractButton) e.getSource();
button.setSize(button.getPreferredSize());
repaint();
}
}
private class MoveTimerListener implements ActionListener {
#Override
public void actionPerformed(ActionEvent e) {
if (moveRight) {
if (moveButton.getLocation().x + moveButton.getWidth() >= getWidth()) {
moveRight = false;
}
} else {
if (moveButton.getLocation().x <= 0) {
moveRight = true;
}
}
int x = moveButton.getLocation().x + (moveRight ? DELTA_X : -DELTA_X);
int y = moveButton.getLocation().y;
moveButton.setLocation(new Point(x, y));
repaint();
}
}
private static void createAndShowGui() {
MyMainPanel mainPanel = new MyMainPanel();
JFrame frame = new JFrame("GUI Example");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}

Just added some methods and fixed some lines in your code, you can try it now:
import java.awt.Dimension;
import java.awt.Toolkit;
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.Timer;
public class mainPanel implements ActionListener {
JFrame frame1;
JPanel panel1;
JButton button = new JButton("START");
boolean buttonPressed = false;
boolean move = false;
Timer timer;
int direction = 1;
int x = 0;
public static void main(String[] args) {
new mainPanel().loadGUI();
}
public void loadGUI() {
frame1 = new JFrame("Moving button");
frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame1.setVisible(true);
frame1.setSize(300, 58);
frame1.setResizable(false);
panel1 = new JPanel(); // Xwidth=294, Yheight=272
panel1.setSize(300, 30);
panel1.setLayout(null);
frame1.add(panel1);
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
frame1.setLocation(dim.width / 2 - frame1.getSize().width / 2, dim.height / 2 - frame1.getSize().height / 2);
button.setSize(80, 30); //X, Y
panel1.add(button);
button.addActionListener(this);
moveButton();
}
public void moveButton() {
if (timer == null) {
initTimer();
}
move = !move;
if (move) {
button.setText("STOP");
direction = (direction == 0) ? 1 : 0;
timer.start();
} else {
button.setText("MOVE");
timer.stop();
}
}
public void initTimer() {
timer = new Timer(10, (e) -> {
switch (direction) {
case 0: // right
x++;
if (x >= panel1.getWidth() - button.getWidth()) {
direction = 1;
}
break;
case 1: // left
x--;
if (x <= 0) {
direction = 0;
}
break;
}
button.setLocation(x, 0);
panel1.repaint();
});
}
#Override
public void actionPerformed(ActionEvent e) {
moveButton();
}
}

How to change font size of JButton according to its size?

I have a java application - a calculator. I want to resize font of buttons dynamically with resizing the window of the app. How to implement it?
My idea is using ComponentEvents. I have initial size of the window of application and initial fonts' sizes. I want to change font size according to button's size, affected by window size change. The problem is how to use the ratio [initial window size] / [initial font size] in the overriden method? The ratio is different for each font.
import javax.swing.*;
import java.awt.*;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
public class Main extends JFrame {
public Main() {
super("Test");
JPanel cPane = (JPanel) getContentPane();
cPane.setLayout(new BorderLayout());
MyButton sampleButton = new MyButton("Sample text");
sampleButton.setFont(new Font("Sans Serif", Font.PLAIN, 20));
MyButton a, b, c, d;
a = new MyButton("a");
b = new MyButton("b");
c = new MyButton("c");
d = new MyButton("d");
cPane.add(a, BorderLayout.PAGE_START);
cPane.add(b, BorderLayout.PAGE_END);
cPane.add(c, BorderLayout.LINE_START);
cPane.add(d, BorderLayout.LINE_END);
cPane.add(sampleButton, BorderLayout.CENTER);
setSize(300, 200);
setResizable(true);
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setVisible(true);
}
public static void main(String... args) {
new Main();
}
class MyButton extends JButton implements ComponentListener {
public MyButton(String title) {
super(title);
}
#Override
public void componentResized(ComponentEvent e) {
//resizing font
}
#Override
public void componentMoved(ComponentEvent e) {
}
#Override
public void componentShown(ComponentEvent e) {
}
#Override
public void componentHidden(ComponentEvent e) {
}
}
}

See how you go with this code using GlyphVector to determine the largest Font that will fit.
The GUI was a little shaky unless there was a delay between setting the frame visible and adding the ComponentListener. I solved that by delaying adding the listener using a single shot Swing Timer.
Is is based on Calculet which is a fully functioning (if simple) calculator using the ScriptEngine.
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import java.util.ArrayList;
import javax.script.*;
import javax.swing.border.Border;
class SwingCalculator implements ActionListener, KeyListener {
JTextField io;
ScriptEngine engine;
ArrayList<JButton> controls;
final BufferedImage textImage = new BufferedImage(
100, 100,
BufferedImage.TYPE_INT_ARGB);
public int getMaxFontSizeForControls() {
Graphics2D g = textImage.createGraphics();
FontRenderContext frc = g.getFontRenderContext();
int maxSize = 500;
for (JButton b : controls) {
// skip the = button..
if (!b.getText().equals("=")) {
int max = getMaxFontSizeForControl(b, frc);
if (maxSize > max) {
maxSize = max;
}
}
}
g.dispose();
return maxSize;
}
public int getMaxFontSizeForControl(JButton button, FontRenderContext frc) {
Rectangle r = button.getBounds();
Insets m = button.getMargin();
Insets i = button.getBorder().getBorderInsets(button);
Rectangle viewableArea = new Rectangle(
r.width -
(m.right + m.left + i.left + i.right),
r.height -
(m.top + m.bottom + i.top + i.bottom)
);
Font font = button.getFont();
int size = 1;
boolean tooBig = false;
while (!tooBig) {
Font f = font.deriveFont((float) size);
GlyphVector gv = f.createGlyphVector(frc, button.getText());
Rectangle2D box = gv.getVisualBounds();
if (box.getHeight() > viewableArea.getHeight()
|| box.getWidth() > viewableArea.getWidth()) {
tooBig = true;
size--;
}
size++;
}
return size;
}
SwingCalculator() {
// obtain a reference to the JS engine
engine = new ScriptEngineManager().getEngineByExtension("js");
JPanel gui = new JPanel(new BorderLayout(2, 2));
controls = new ArrayList<JButton>();
JPanel text = new JPanel(new GridLayout(0, 1, 3, 3));
gui.add(text, BorderLayout.NORTH);
io = new JTextField(15);
Font font = io.getFont();
font = font.deriveFont(font.getSize() * 1.7f);
io.setFont(font);
io.setHorizontalAlignment(SwingConstants.TRAILING);
io.setFocusable(false);
text.add(io);
JPanel buttons = new JPanel(new GridLayout(4, 4, 2, 2));
gui.add(buttons, BorderLayout.CENTER);
addButton(buttons, "7");
addButton(buttons, "8");
addButton(buttons, "9");
addButton(buttons, "/");
addButton(buttons, "4");
addButton(buttons, "5");
addButton(buttons, "6");
addButton(buttons, "*");
addButton(buttons, "1");
addButton(buttons, "2");
addButton(buttons, "3");
addButton(buttons, "-");
addButton(buttons, "0");
addButton(buttons, ".");
addButton(buttons, "C");
addButton(buttons, "+");
JButton equals = new JButton("=");
equals.addKeyListener(this);
controls.add(equals);
equals.addActionListener(this);
gui.add(equals, BorderLayout.EAST);
gui.setBorder(new EmptyBorder(5, 5, 5, 5));
final JFrame f = new JFrame("Calculet");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setContentPane(gui);
f.pack();
f.setMinimumSize(f.getSize());
f.setLocationByPlatform(true);
f.setVisible(true);
final ComponentListener cl = new ComponentAdapter() {
#Override
public void componentResized(ComponentEvent e) {
int ii = getMaxFontSizeForControls();
for (JButton b : controls) {
if (!b.getText().equals("=")) {
b.setFont(b.getFont().deriveFont((float) ii));
}
}
}
};
ActionListener al = new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
f.addComponentListener(cl);
}
};
Timer t = new Timer(500, al);
t.setRepeats(false);
t.start();
}
public void addButton(Container c, String text) {
JButton b = new JButton(text);
b.addActionListener(this);
b.addKeyListener(this);
controls.add(b);
c.add(b);
}
public void calculateResult() {
try {
Object result = engine.eval(io.getText());
if (result == null) {
io.setText("Output was 'null'");
} else {
io.setText(result.toString());
}
} catch (ScriptException se) {
io.setText(se.getMessage());
}
}
public void actionPerformed(ActionEvent ae) {
String command = ae.getActionCommand();
if (command.equals("C")) {
io.setText("");
} else if (command.equals("=")) {
calculateResult();
} else {
io.setText(io.getText() + command);
}
}
private JButton getButton(String text) {
for (JButton button : controls) {
String s = button.getText();
if (text.endsWith(s)
|| (s.equals("=")
&& (text.equals("Equals") || text.equals("Enter")))) {
return button;
}
}
return null;
}
/*
* START - Because I hate mice.
*/
public void keyPressed(KeyEvent ke) {
}
public void keyReleased(KeyEvent ke) {
String s = ke.getKeyText(ke.getKeyCode());
JButton b = getButton(s);
if (b != null) {
b.requestFocusInWindow();
b.doClick();
}
}
public void keyTyped(KeyEvent ke) {
}
public static void main(String[] args) {
Runnable r = new Runnable() {
#Override
public void run() {
new SwingCalculator();
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater(r);
}
}

Compare the approaches shown here and here. The former uses an available JComponent.sizeVariant.
The latter cites an example using FontMentrics.
Or TextLayout.

Is it possible to save text horizontal in vertical JProgressbar

JProgressBar in JProgressBar.VERTICAL mode rotates painted String.
Is it possible to save string HORIZONTAL?

Another option is to use a BorderLayout + JLabel
or if you are using Java 1.7.0, you can use a JLayer
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.plaf.LayerUI;
public class ProgressBarLabelTest {
private static JProgressBar makeProgressBar1(BoundedRangeModel model) {
JProgressBar progressBar = new JProgressBar(model) {
private JLabel label = new JLabel("000/100", SwingConstants.CENTER);
private ChangeListener changeListener = null;
#Override public void updateUI() {
removeAll();
if(changeListener!=null) removeChangeListener(changeListener);
super.updateUI();
EventQueue.invokeLater(new Runnable() {
#Override public void run() {
setLayout(new BorderLayout());
changeListener = new ChangeListener() {
#Override public void stateChanged(ChangeEvent e) {
int iv = (int)(100 * getPercentComplete());
label.setText(String.format("%03d/100", iv));
}
};
addChangeListener(changeListener);
add(label);
label.setBorder(BorderFactory.createEmptyBorder(0,4,0,4));
}
});
}
#Override public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
Insets i = label.getInsets();
d.width = label.getPreferredSize().width + i.left + i.right;
return d;
}
};
initProgressBar(progressBar);
return progressBar;
}
private static JComponent makeProgressBar2(BoundedRangeModel model) {
final JLabel label = new JLabel("000/100");
label.setBorder(BorderFactory.createEmptyBorder(4,4,4,4));
LayerUI<JProgressBar> layerUI = new LayerUI<JProgressBar>() {
private final JPanel rubberStamp = new JPanel();
#Override public void paint(Graphics g, JComponent c) {
super.paint(g, c);
Dimension d = label.getPreferredSize();
int x = (c.getWidth() - d.width) / 2;
int y = (c.getHeight() - d.height) / 2;
JLayer jlayer = (JLayer)c;
JProgressBar progress = (JProgressBar)jlayer.getView();
int iv = (int)(100 * progress.getPercentComplete());
label.setText(String.format("%03d/100", iv));
SwingUtilities.paintComponent(
g, label, rubberStamp, x, y, d.width, d.height);
}
};
JProgressBar progressBar = new JProgressBar(model) {
#Override public Dimension getPreferredSize() {
Dimension d = super.getPreferredSize();
Insets i = label.getInsets();
d.width = label.getPreferredSize().width + i.left + i.right;
return d;
}
};
initProgressBar(progressBar);
return new JLayer<JProgressBar>(progressBar, layerUI);
}
public JComponent makeUI() {
final BoundedRangeModel m = new DefaultBoundedRangeModel();
JProgressBar progressBar0 = new JProgressBar(m);
initProgressBar(progressBar0);
progressBar0.setStringPainted(true);
JPanel p = new JPanel();
p.add(progressBar0);
p.add(makeProgressBar1(m));
p.add(makeProgressBar2(m));
p.add(new JButton(new AbstractAction("+10") {
private int i = 0;
#Override public void actionPerformed(ActionEvent e) {
m.setValue(i = (i>=100) ? 0 : i + 10);
}
}));
return p;
}
private static void initProgressBar(JProgressBar progressBar) {
progressBar.setOrientation(SwingConstants.VERTICAL);
progressBar.setStringPainted(false);
progressBar.setForeground(Color.GREEN);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
#Override public void run() { createAndShowGUI(); }
});
}
public static void createAndShowGUI() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new ProgressBarLabelTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
}

It is a true-Hack but if works for me:
I lookup in the Stack if UI asks for orientation while printing the label, if so I return another orientation.
JProgressBar progress = new JProgressBar(){
#Override
public int getOrientation() {
for( StackTraceElement elem : new Throwable().getStackTrace() ) {
if(elem.getMethodName().equals( "paintText" ) || (elem.getMethodName().equals( "paintString" ))) {
return JProgressBar.HORIZONTAL;
}
}
return JProgressBar.VERTICAL;
}
};

You can override paintString() in a custom BasicProgressBarUI. A related example is seen here.