How to set the position of a JPanel anywhere on the screen

php editor Strawberry will introduce you how to set JPanel to any position on the screen. JPanel is a commonly used container component in Java Swing. JPanel can be positioned by setting the layout manager and setting the position of the component. First, we need to choose an appropriate layout manager, such as FlowLayout, BorderLayout, etc. You can then place the JPanel anywhere on the screen by setting the component's bounds and position properties. In this way, you can easily realize the free positioning of JPanel and provide a more flexible interface design and interactive experience.

Question content

I need to have a number of JPanels but I can't place them where I want because when I try to change things like borders, they either disappear. Thanks for any help

This is the code for the panel I'm trying to position. I want it to be about 3/4 of the way to the right of the screen, but I can't move it beyond the top right corner

textField = new JTextField("Sample Text");
textField.setPreferredSize(new Dimension(200, 30));
textField.setFont(new Font("Arial", Font.PLAIN, 16));
textField.setEditable(false); // Set to false to make it read-only

JPanel textPanel = new JPanel(new GridBagLayout());
textPanel.add(textField);
add(textPanel, BorderLayout.NORTH);

Workaround

Panels (and all of Swing) always require a top-level component (such as a JFrame, JDialog, or JWindow) to render on the screen. Even if you position the panel absolutely inside the top-level container (it's the layout manager's job to correct that) - what you need to change is the position of the top-level container.

Here is an example of creating a window that is not in the upper left corner:

import javax.swing.JFrame;
import javax.swing.JLabel;

public class Main {
    
    public static void main(String[] args) {
        JFrame f = new JFrame("Positioning Test Frame");
        f.add(new JLabel("Window Content Area"));
        f.pack(); // make the Window as small as possible
        //f.setLocationRelativeTo(null); // this line will center the window
        f.setLocation(200, 200); // this line will go to absolute coordinates
        f.setVisible(true);
    }
}

You may need to calculate the window position based on the screen size (about 3/4 to the right). The code below will provide the desktop size (which may consist of multiple screens). If you're only interested in one of the screens, you can probably see where you get that value from.

public static Rectangle2D getDesktopSize() {
    Rectangle2D result = new Rectangle2D.Double();
    GraphicsEnvironment localGE = GraphicsEnvironment.getLocalGraphicsEnvironment();
    for (GraphicsDevice gd : localGE.getScreenDevices()) {
      for (GraphicsConfiguration graphicsConfiguration : gd.getConfigurations()) {
        result.union(result, graphicsConfiguration.getBounds(), result);
      }
    }
    return result;
}

The above is the detailed content of How to set the position of a JPanel anywhere on the screen. For more information, please follow other related articles on the PHP Chinese website!