I'm working on a Swing GUI using the JLayeredPane. The JFrame has a JLayeredPane which contains two JPanels. Later I want to display some components in the JPanels, I cut this part of the code to make it shorter for you.
How do I resize the JFrame to the sizes of the JPanels? frame.pack() does not work and without the line setting the preferred size the GUI will show with minimal size.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import javax.swing.JFrame;
import javax.swing.JLayeredPane;
import javax.swing.JPanel;
public class TestGUI {
private JFrame frame;
private JLayeredPane layeredPane;
private JPanel panelBottom;
private JPanel panelTop;
private MainMenuBar menuBar;
public TestGUI() {
// panel bottom:
panelBottom = new JPanel();
panelBottom.setSize(1000, 500);
panelBottom.setBackground(new Color(0, 100, 0, 100));
panelBottom.setLayout(new GridBagLayout());
// panel top:
panelTop = new JPanel();
panelTop.setSize(950, 450);
panelTop.setBackground(new Color(0, 0, 100, 100));
panelTop.setLayout(new GridBagLayout());
// layered pane:
layeredPane = new JLayeredPane();
layeredPane.add(panelBottom, 1);
layeredPane.add(panelTop, 0);
// frame building:
frame = new JFrame();
menuBar = new MainMenuBar();
frame.setJMenuBar(menuBar);
frame.setLayout(new BorderLayout());
frame.setPreferredSize(new Dimension(1100, 600)); // <-- Without this the GUI will be very small
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(layeredPane, BorderLayout.CENTER);
frame.pack(); // <-- does not work!
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
new TestGUI();
}
}
EDIT: I could just change the preferred size line to fit the biggest JPanel, but i ask the question because I want the JFrame to resize depending on the size of the JPanels dynamically.
