Question

    Panel controlPanel = new Panel ();
    JPanel chatPanel = new JPanel();
    JPanel buttomsPanel = new JPanel();

    controlPanel = new Panel();
    controlPanel.setLayout(new FlowLayout(10));



    Panel panel = new Panel();

    panel.setBackground(Color.DARK_GRAY);
    panel.setSize(700,700);
    GridLayout layout = new GridLayout(6,6, 10, 10);

    panel.setLayout(layout);


    for (int i= 0; i < 36; i++){
         panel.add(new Button(""));
    }
    controlPanel.add(panel);


    buttomsPanel.add(new Button(""));
    frame.add(buttomsPanel);


    frame.add(controlPanel);
    frame.setSize(900, 700);

基本上我添加到gui的第二个按钮不会显示。另外，我想放另外两个字段，我不知道如何移动它们，或者它们是否应先进入面板然后移动。

Answer 1

让我们从ambaguity开始...

Button可以是java.awt.Button或javafx.scene.control.Button，在任何一种情况下，它都可能与JPanel无关。

Panel是java.awt.Panel，与Swing不相称。在Swing中不混合使用AWT组件会更容易。

接下来，JFrame默认情况下使用BorderLayout，这意味着当您执行类似的操作时...

frame.add(buttomsPanel);
frame.add(controlPanel);

controlPanel可能是显示的那个（并且考虑到AWT和Swing之间的z排序的奇怪之处，无论你添加它们的顺序如何，都可能希望显示它）。

要解决此问题，您需要在BorderLayout中指定要添加面板的位置，例如......

frame.add(buttomsPanel);
frame.add(controlPanel, BorderLayout.SOUTH);

并使用JPanel代替Panel和JButton代替Button ...

有关详细信息，请参阅How to Use Borders

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Panel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class Test {

    public static void main(String[] args) {
        new Test();
    }

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }
                JPanel controlPanel = new JPanel(new FlowLayout(10));
                JPanel chatPanel = new JPanel();
                JPanel buttomsPanel = new JPanel();

                Panel panel = new Panel();

                panel.setBackground(Color.DARK_GRAY);
                panel.setSize(700, 700);
                GridLayout layout = new GridLayout(6, 6, 10, 10);

                panel.setLayout(layout);

                for (int i = 0; i < 36; i++) {
                    panel.add(new JButton(""));
                }
                controlPanel.add(panel);

                buttomsPanel.add(new JButton(""));

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(buttomsPanel);
                frame.add(controlPanel, BorderLayout.SOUTH);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

}

我如何移动java gui元素？

1 个答案: