java - 如何让jininternalframe在大型机中居中？

Question

我正在开发一个java项目。我已经创建了带有桌面 Pane 和几个内部框架的主框架。我想将所有 j 个内部框架居中。有人可以给我一个如何将其居中的建议吗？谢谢。

Answer 1

试试这个逻辑。我只为一个 JInternalFrame 执行此操作。

import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JDesktopPane;
import javax.swing.SwingUtilities;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.awt.Component;

public final class CenterChild extends JFrame{

    private JDesktopPane   contentPane;
    private JInternalFrame child;

    @Override
    public void frameInit(){
        super.frameInit();
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(0,0,500,500);
        this.selfInitialize();
    }

    private void selfInitialize(){
        contentPane = new JDesktopPane();
        child       = new JInternalFrame("Centered Child");

        child.setClosable(true);
        child.setVisible(true);

        child.setSize(300,200);
        //Centering the JInternalFrame
        child.setLocation((getWidth() - child.getWidth())/2, (getHeight() - child.getHeight())/2);

        contentPane.add(child);
        this.setContentPane(contentPane);

        addComponentListener(new ResizeEventHandler());
    }
    public static void main(String[] args) {
        SwingUtilities.invokeLater(()->{ new CenterChild();});
    }
    //Code that re positions JInternalFrame while main window size changes
    private class ResizeEventHandler extends ComponentAdapter{
        @Override
        public void componentResized(ComponentEvent e){
            Component invoker = e.getComponent();
            //re positioning the JInternalFrame to the main window's center
            child.reshape((invoker.getWidth() - child.getWidth())/2, (invoker.getHeight() - child.getHeight())/2,300,200);          
        }
    }
}