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JPanel is added onto other Jpanel on togglebutton Click


JPanel is added onto other Jpanel on togglebutton Click

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JPanel is added onto other Jpanel on togglebutton Click
Tag : java , By : eusden
Date : December 01 2020, 04:52 PM

fixed the issue. Will look into that further The problem is you keep creating instances of your JPanel. You could remove the JPanel if your JToggleButton is not selected and add an already created instance of your JPanel if the button is selected. See this simple example:
public class MainFrame extends JFrame {

private JPanel topPanel = new JPanel();
private JPanel centerPanel = new JPanel();
private JToggleButton toggleButton = new JToggleButton("Toggle");

public MainFrame() {
    this.setVisible(true);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.setLayout(new BorderLayout());

    this.topPanel.setPreferredSize(new Dimension(100, 100));
    this.centerPanel.setPreferredSize(new Dimension(100, 100));
    this.toggleButton.setPreferredSize(new Dimension(100, 100));

    this.add(topPanel, BorderLayout.NORTH);
    this.add(centerPanel, BorderLayout.CENTER);
    this.add(toggleButton, BorderLayout.SOUTH);

    this.toggleButton.addItemListener(new ItemListener() {
        @Override
        public void itemStateChanged(ItemEvent e) {
            if(e.getStateChange() == ItemEvent.SELECTED) {
                add(centerPanel, BorderLayout.CENTER);
            } else {
                remove(centerPanel);
            }
            pack();
        }
    });

    this.pack();
    this.setVisible(true);
}
}

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In Java 1.6, why does adding a Jpanel to another JPanel using the default add() not display the added panel?


Tag : java , By : keird
Date : March 29 2020, 07:55 AM
Does that help Probably because your panel doesn't have a preferred size.
When you add a panel to a BorderLayout the default is to place it in the center, so the panel will automatically be resized to the size of the frame.

Java Swing - How to access a JComponent of one JPanel from other JPanel, both added to the JFrame?


Tag : java , By : Mark W
Date : March 29 2020, 07:55 AM
To fix this issue You can make instance variables that reference the panels when you create them, and use those variables to reference the panels.
public class myFrame extends JFrame {
   public static JPanel buttonPanel;
   public static JPanel statusPanel;

   public static void main(String[] args) {
      buttonPanel = new JPanel();   
   }
}

Java CardLayout JPanel moves up, when second JPanel added


Tag : java , By : user184415
Date : March 29 2020, 07:55 AM
it fixes the issue Since you are adding two JPanels to your main JPanel, these two panels both need to fit within the main panel.
If one of the inner panels is much larger than the other one, the main panel will adjust to fit the larger one.
chatbox.setPreferredSize(new Dimension(200,200));
JPanel connectPanel = new JPanel();
connectPanel.setSize(640, 480);
mainPanel.add(connectPanel, "connectPanel");

Make an added JPanel visible inside a parent JPanel


Tag : java , By : Habikki
Date : March 29 2020, 07:55 AM
this one helps. Use a CardLayout, as shown here.

Not showing graphics in JPanel which is added to another JPanel


Tag : java , By : ziqew
Date : March 29 2020, 07:55 AM
may help you . Please do watch the constructor of the Main Class, make this your habbit to follow the sequence as shown in this example. First add components to the JFrame then only make calls like pack(), setSize() or setVisible(...), not before that.
Always make it your habbit, that whenever you override paintcomponent() method, override getPreferredSize() method as well.
import java.awt.Dimension;
import java.awt.Graphics;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JFrame{
    public static void main(String[] args) {
        new Main();
    }

    public Main(){
        setTitle("Sample");        
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setContentPane(new SamplePanel2());
        pack();        
        setVisible(true);
    }
}

class SamplePanel2 extends JPanel{
    public SamplePanel2(){
        add(new JButton("Hi"));
        add(new SamplePanel());
    }
}
class SamplePanel extends JPanel {
    public SamplePanel(){
    }

    @Override
    public Dimension getPreferredSize()
    {
        return (new Dimension(300, 300));
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.drawString("HHHHHHHHHHHH", 100, 100);
    }
}
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