Vlad K. Vlad K. - 6 months ago 37
Java Question

How to switch between JPanels in CardLayout?

I have two JPanels that I want to switch between when user clicks on them.

So I created a

Window
with a
JFrame
in it. Then I create a
JPanel
called
cards
and set its layout to
CardLayout
. Then I create two more
JPanel
s - these are the panels that I want to switch between - and I add them to
cards
. I add
mouseClicked
event listeners and I add
cardLayout.next(cards)
so the switch will happen. It doesn't work.

Here's my code:

public class Window {
private JFrame frame;
private JPanel cards;
private JPanel panel1;
private JPanel panel2;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Window window = new Window();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Window() {
initialize();
}
private void initialize() {
frame = new JFrame();
frame.setBounds(100, 100, 790, 483);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

cards = new JPanel();
cards.setLayout(new CardLayout());
panel1 = new JPanel();
panel1.setBackground(Color.BLACK);
panel1.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e){
java.awt.Toolkit.getDefaultToolkit().beep(); //debug beep
CardLayout cl = (CardLayout) cards.getLayout();
cl.next(cards);
}
});

panel2 = new JPanel();
panel2.setBackground(Color.WHITE);
panel1.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e){
CardLayout cl = (CardLayout) cards.getLayout();
cl.next(cards);
}
});

cards.add(panel1, "panel1");
cards.add(panel2, "panel2");

frame.getContentPane().add(cards);
}

}


Why doesn't it work?

Answer

You've added 2 MouseListeners to the same panel which effectively cancels out the call to CardLayout.next. Replace one of

panel1.addMouseListener(new MouseAdapter() {

with

panel2.addMouseListener(new MouseAdapter() {
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