Java的GridBagLayout的：使组件左对齐(Java GridBagLayout : ma

2019-09-24 04:02发布

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我已经使用这个布局GridBagLayout ： 

public class Example extends JFrame {
    public Example() {
        Border outline = BorderFactory.createLineBorder(Color.black);
        GridBagLayout gbl = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();
        JPanel pane = new JPanel(gbl);

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

        JLabel unitLbl = new JLabel("Unit");
        unitLbl.setBorder(outline);
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.ipadx = 30;
        gbc.ipady = 10;
        gbl.setConstraints(unitLbl, gbc);
        pane.add(unitLbl);

        JLabel typeLbl = new JLabel("Type");
        typeLbl.setBorder(outline);
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbc.ipadx = 30;
        gbc.ipady = 10;
        gbl.setConstraints(typeLbl, gbc);
        pane.add(typeLbl);

        JTextField unitField = new JTextField();
        typeLbl.setBorder(outline);
        gbc.gridx = 1;
        gbc.gridy = 0;
        gbc.ipadx = 30;
        gbc.ipady = 10;
        gbl.setConstraints(unitField, gbc);
        pane.add(unitField);

        String[] type = {"All", "Verb", "Noun", "Adjective"};
        JComboBox<String> comboBox = new JComboBox<String>(type);
        gbc.gridx = 1;
        gbc.gridy = 1;
        gbc.ipadx = 30;
        gbc.ipady = 10;
        gbl.setConstraints(comboBox, gbc);
        pane.add(comboBox);


        add(pane, BorderLayout.CENTER);
        setSize(new Dimension(400, 300));
        getContentPane().setBackground(Color.WHITE);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Example();
            }
        });
    }
}

在这个例子中，在运行时，似乎每组分是在所述框架的中心。 但我要的是：

  1. 两个JLabel （ unitLbl和typelbl ）将在框架的左侧
  2. JTextField和JComboBox将两个右边JLabel ，分别与之间的小的距离。
  3. 此外，我想添加一个新JButton在网格位置（3,0），但二者的这个位置和高度JLabel高度。 这意味着，这个按钮的高度是“两线”。

我怎样才能解决这个问题的代码来实现这一目标？ 请帮我。

谢谢 ：）

Answer 1:

你想用GridBagConsraints#anchor定义要对齐的组件在细胞内的位置。

为了让组件可以跨越细胞的数量，你想使用GridBagConstraints#gridwidth和GridBagConstraints#gridheight （默认为1） 

public class TestLayout09 {

    public static void main(String[] args) {
        new TestLayout09();
    }

    public TestLayout09() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException ex) {
                } catch (InstantiationException ex) {
                } catch (IllegalAccessException ex) {
                } catch (UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame();
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new LayoutPane());
                frame.setBackground(Color.WHITE);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }

        });
    }

    public class LayoutPane extends JPanel {

        public LayoutPane() {
            Border outline = BorderFactory.createLineBorder(Color.black);
            setLayout(new GridBagLayout());
            GridBagConstraints gbc = new GridBagConstraints();

            // I'm not sure this really is what you want, but I may be mistaken
//            gbc.weighty = 1.0;
//            gbc.weightx = 1.0;

            JLabel unitLbl = new JLabel("Unit");
            unitLbl.setBorder(outline);
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.ipadx = 30;
            gbc.ipady = 10;
            gbc.anchor = GridBagConstraints.WEST;
            add(unitLbl, gbc);

            JLabel typeLbl = new JLabel("Type");
            typeLbl.setBorder(outline);
            gbc.gridx = 0;
            gbc.gridy = 1;
            gbc.ipadx = 30;
            gbc.ipady = 10;
            add(typeLbl, gbc);

            JTextField unitField = new JTextField();
            typeLbl.setBorder(outline);
            gbc.gridx = 1;
            gbc.gridy = 0;
            gbc.ipadx = 30;
            gbc.ipady = 10;
            gbc.anchor = GridBagConstraints.EAST;
            add(unitField, gbc);

            String[] type = {"All", "Verb", "Noun", "Adjective"};
            JComboBox<String> comboBox = new JComboBox<String>(type);
            gbc.gridx = 1;
            gbc.gridy = 1;
            gbc.ipadx = 30;
            gbc.ipady = 10;
            add(comboBox, gbc);

            JButton btn = new JButton("Test");
            gbc.gridx = 3;
            gbc.gridy = 0;
            gbc.fill = GridBagConstraints.BOTH;
            gbc.gridheight = 2;
            add(btn, gbc);
        }
    }
}


Answer 2:

这样的事情应该做的伎俩： 

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class Example extends JFrame {
    public Example() {
        GridBagLayout gbl = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();
        JPanel pane = new JPanel(gbl);
        gbc.anchor = GridBagConstraints.WEST;

        JLabel unitLbl = new JLabel("Unit");
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.insets = new Insets(3, 3, 3, 30);
        gbl.setConstraints(unitLbl, gbc);
        pane.add(unitLbl);

        JLabel typeLbl = new JLabel("Type");
        gbc.gridx = 0;
        gbc.gridy = 1;
        gbl.setConstraints(typeLbl, gbc);
        pane.add(typeLbl);

        gbc.weightx = 1.0;
        gbc.insets = new Insets(3, 3, 3, 3);

        JTextField unitField = new JTextField();
        gbc.gridx = 1;
        gbc.gridy = 0;
        gbc.fill = GridBagConstraints.BOTH;
        gbl.setConstraints(unitField, gbc);
        pane.add(unitField);

        String[] type = { "All", "Verb", "Noun", "Adjective" };
        JComboBox<String> comboBox = new JComboBox<String>(type);
        gbc.gridx = 1;
        gbc.gridy = 1;
        gbc.fill = GridBagConstraints.NONE;
        gbl.setConstraints(comboBox, gbc);
        pane.add(comboBox);

        final JButton someButton = new JButton("Click me");
        someButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(someButton, "You have clicked " + someButton.getText());
            }
        });

        gbc.gridx = 3;
        gbc.gridy = 0;
        gbc.gridheight = 2;
        gbc.fill = GridBagConstraints.VERTICAL;
        pane.add(someButton, gbc);
        add(pane, BorderLayout.CENTER);
        setSize(new Dimension(400, 300));
        getContentPane().setBackground(Color.WHITE);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new Example();
            }
        });
    }
}
  • 您需要使用适当weightx/weighty （额外的水平/垂直空间是如何重新分配）
  • 使用适当的fill属性（被垂直拉伸的组件/水平/二者？）
  • 使用适当的anchor属性（如果组件不被拉伸，或至少不同时方向，在那里它应该位于其小区内）
  • 我通常喜欢使用插图代替填充，因此，我更喜欢insets超过ipadx/ipady （多余的空白空间应该围绕构件或构件的内部添加）


Answer 3:

一些答案：

把锚unitlbl到WEST。 

gbc.anchor = GridBagConstraints.WEST;

而锚unitField到东部。 

gbc.anchor = GridBagConstraints.EAST;

而对于按钮： 

JButton button = new JButton("Test");
gbc.fill = GridBagConstraints.VERTICAL;
gbc.gridx = 3;
gbc.gridy = 0;
gbc.gridwidth = 1;
gbc.gridheight = 2;
gbc.weighty = 1;
pane.add(button, gbc);


文章来源: Java GridBagLayout : make component align to left
标签： java swing gridbaglayout
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