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Java/Swing : Trying to get BorderLayout to play nice with GridBagLayout

转载 作者:搜寻专家 更新时间:2023-11-01 03:29:49 24 4
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我想要一个有 3 个菜单的窗口,一个在左边,另一个在中间,最后一个在右边。像这样:

--------------------------------------------
-toolbar1---------toolbar2---------toolbar3-
--------------------------------------------
- -
- rest of the window does something here -

我遇到的问题是这是我得到的结果:

--------------------------------------------
---------toolbar1toolbar2toolbar3-----------
--------------------------------------------
- -
- rest of the window does something here -

下面是一些示例代码(编译并显示问题):

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

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


public class TestClass extends JFrame {

public TestClass() {
super("test");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());

final JPanel upper = new JPanel();
upper.setLayout(new GridBagLayout());
final GridBagConstraints gbc = new GridBagConstraints();

final JButton toolbar1 = new JButton("toolbar1");
final JButton toolbar2 = new JButton("toolbar2");
final JButton toolbar3 = new JButton("toolbar3");

gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
upper.add(toolbar1, gbc);

gbc.gridx = 1;
gbc.anchor = GridBagConstraints.CENTER;
upper.add(toolbar2, gbc);

gbc.gridx = 2;
gbc.anchor = GridBagConstraints.EAST;
upper.add(toolbar3, gbc);

add(upper, BorderLayout.NORTH);

final JPanel something = new JPanel();
something.setBackground(Color.WHITE);
something.setPreferredSize(new Dimension(600, 600));
something.repaint();
add(something, BorderLayout.CENTER);

pack();
setLocationRelativeTo(null);
setVisible(true);
}

public static void main(String[] args) {
final TestClass test = new TestClass();
}
}

我该如何解决?我认为通过在 GridBagConstraints 中设置 anchor 我会处理它,但这没有用。

最佳答案

你忘了添加:

gbc.weightx = 1.0;
gbc.weighty = 1.0;

您更改后的代码应如下所示:

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

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


public class TestClass extends JFrame {

public TestClass() {
super("test");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLayout(new BorderLayout());

final JPanel upper = new JPanel();
GridBagLayout gridbag = new GridBagLayout();
upper.setLayout(gridbag);
GridBagConstraints gbc = new GridBagConstraints();

final JButton toolbar1 = new JButton("toolbar1");
final JButton toolbar2 = new JButton("toolbar2");
final JButton toolbar3 = new JButton("toolbar3");

gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1.0;
gbc.weighty = 1.0;
gbc.anchor = GridBagConstraints.WEST;
upper.add(toolbar1, gbc);


gbc.gridx = 1;
gbc.anchor = GridBagConstraints.CENTER;
upper.add(toolbar2, gbc);


gbc.gridx = 2;
gbc.anchor = GridBagConstraints.EAST;
gbc.gridwidth = GridBagConstraints.REMAINDER;
upper.add(toolbar3, gbc);


add(upper, BorderLayout.NORTH);

final JPanel something = new JPanel();
something.setBackground(Color.WHITE);
something.setPreferredSize(new Dimension(600, 600));
something.repaint();
add(something, BorderLayout.CENTER);

pack();
setLocationRelativeTo(null);
setVisible(true);
}

public static void main(String[] args) {
final TestClass test = new TestClass();
}
}

有效。

关于Java/Swing : Trying to get BorderLayout to play nice with GridBagLayout,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3509211/

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