网络豆 IDE |自定义标题栏上的居中标题文本

Question

我正在创建自定义标题栏，但问题是我无法使文本在 JFrame 上居中，因为我在 pnlTitle 中有 3 个按钮。我试图将按钮拖放到 JLabel 内部，但它仍在 JLabel 外部。如何实现？

Answer 1

尝试使用按钮在东边、标题在中间的边框布局。

希望对您有所帮助。

-- 更新了----

这是我试图分享的片段代码：

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;

public class TestSwing {

public static void main(String...s) {

    JFrame jframe = new JFrame();
    JPanel heading = new JPanel();
    JPanel buttons = new JPanel();
    JButton button1 = new JButton("Button1");
    JButton button2 = new JButton("Button2");
    JButton button3 = new JButton("Button3");
    button1.setPreferredSize(new Dimension(40, 40));
    button2.setPreferredSize(new Dimension(40, 40));
    button3.setPreferredSize(new Dimension(40, 40));
    buttons.setLayout(new GridLayout(1,3));
    buttons.add(button1);
    buttons.add(button2);
    buttons.add(button3);
    heading.setLayout(new BorderLayout());
    JLabel title = new JLabel("Title",SwingConstants.CENTER);
    title.setVerticalAlignment(SwingConstants.CENTER);
    heading.add(buttons,BorderLayout.EAST);
    jframe.setLayout(new BorderLayout());
    jframe.add(heading,BorderLayout.NORTH);
    JPanel blankPanel = new JPanel();
    blankPanel.setPreferredSize(new Dimension(120,40));
    heading.add(blankPanel,BorderLayout.WEST);
    heading.add(title,BorderLayout.CENTER);
    jframe.setVisible(true);

}
}

输出截图：

Answer 2

免责声明：这是一个巨大的作弊...

所以，这个例子基本上利用了 GridBagLayout，这将允许 "title" 标签占据容器中可用 space 的整个宽度，并允许按钮布局同时沿着右边缘

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;

public class Test {

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

    public Test() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                JFrame frame = new JFrame();
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {

        public TestPane() {
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.weightx = 1;
            gbc.weighty = 1;
            gbc.fill = GridBagConstraints.BOTH;
            // This is a space to force the buttons
            // to the right edge.
            // You might be able to play around with the constraints
            // for b1 to basically get the same affect
            add(new JLabel(), gbc);
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            JLabel label = new JLabel("This is the title");
            label.setHorizontalAlignment(JLabel.CENTER);
            add(label, gbc);

            gbc = new GridBagConstraints();
            gbc.gridx = 1;
            gbc.gridy = 0;
            add(new JButton("B1"), gbc);
            gbc.gridx++;
            add(new JButton("B2"), gbc);
            gbc.gridx++;
            add(new JButton("B3"), gbc);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(600, 44);
        }

    }

}

网络豆 IDE |自定义标题栏上的居中标题文本

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