java中gridbaglayout,java swing中的gridbaglayout

网格包布局

令人惊讶的是,基于网格的布局具有灵活性。

如果要将一个组件放置在另一个组件之上,则必须告诉布局这两个组件共享同一单元格。这里就是

gridx

和

gridy

很重要

所以当你做一些像…

add(mainL, gbc);

add(main);

您允许布局管理器决定

main

应该布局,这不是您想要的,相反,您需要为两个组件提供相同的

网格

/

格里迪

约束,例如…

import java.awt.Color;

import java.awt.EventQueue;

import java.awt.Graphics2D;

import java.awt.GridBagConstraints;

import java.awt.GridBagLayout;

import java.awt.Insets;

import java.awt.image.BufferedImage;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import javax.swing.border.LineBorder;

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();

}

JFrame frame = new JFrame("Testing");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.add(new SecondPanel());

frame.pack();

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

});

}

class SecondPanel extends JPanel {

public SecondPanel() {

setLayout(new GridBagLayout());

JPanel main = new JPanel(new GridBagLayout());

main.setBorder(new LineBorder(Color.GRAY));

GridBagConstraints gbc = new GridBagConstraints();

gbc.insets = new Insets(4, 4, 4, 4);

gbc.gridwidth = GridBagConstraints.REMAINDER;

gbc.anchor = GridBagConstraints.LINE_START;

main.add(new JLabel("Ope"), gbc);

gbc.anchor = GridBagConstraints.LINE_END;

main.add(new JLabel("opeV"), gbc);

gbc.anchor = GridBagConstraints.LINE_START;

main.add(new JLabel("am"), gbc);

gbc.anchor = GridBagConstraints.LINE_END;

main.add(new JLabel("amV"), gbc);

gbc.anchor = GridBagConstraints.LINE_START;

main.add(new JLabel("cry"), gbc);

gbc.anchor = GridBagConstraints.LINE_END;

main.add(new JLabel("cryV"), gbc);

gbc.anchor = GridBagConstraints.CENTER;

main.add(new JButton("Add"), gbc);

BufferedImage img = new BufferedImage(320, 240, BufferedImage.TYPE_INT_ARGB);

Graphics2D g2d = img.createGraphics();

g2d.setColor(Color.RED);

g2d.drawLine(0, 0, 320, 240);

g2d.drawLine(320, 0, 0, 240);

g2d.dispose();

JLabel mainL = new JLabel();

mainL.setIcon(new ImageIcon(img));

mainL.setBorder(new LineBorder(Color.RED));

gbc = new GridBagConstraints();

gbc.gridx = 0;

gbc.gridy = 0;

add(main, gbc);

add(mainL, gbc);

}

}

}

我走了

主要的

opaque

并添加了边框以便您可以看到它。还要注意的是,组件是以filo(相反)顺序显示的

网格包布局

是一种艺术形式,一种你只需在其中混来混去就能掌握的艺术形式

但这不能解决我的问题

你的意思是…

gbc = new GridBagConstraints();

gbc.gridx = 0;

gbc.gridy = 0;

add(main, gbc);

gbc.gridx++;

add(mainL, gbc);