Java中的GridLayout帮助

Java中的GridLayout帮助,java,swing,grid-layout,Java,Swing,Grid Layout,我有一个JPanel,代码如下: JPanel pane = new JPanel(); pane.setLayout(new GridLayout(3, 2, 10, 30)); final JTextField fileName = new JTextField(); pane.add(fileName); JButton creater = new JButton("Create File"); pane.add(creater); JButton deleter = new JButto

我有一个JPanel,代码如下:

JPanel pane = new JPanel();
pane.setLayout(new GridLayout(3, 2, 10, 30));
final JTextField fileName = new JTextField();
pane.add(fileName);
JButton creater = new JButton("Create File");
pane.add(creater);
JButton deleter = new JButton("Delete File");
pane.add(deleter);

我想知道,如何使JTextField在GridLayout上占用两个空格,而让两个按钮在同一行上各占用一个空格,从而共享一行?

您不能使用GridLayout进行列跨距。我建议你尝试一下,这是一个很难做的GridleOut。您必须创建更宽的单元格(例如,
新建GridLayout(2,2,10,30)
,然后将文本字段添加到第一个单元格。然后您必须创建另一个带有GridLayout(2,1)的面板,将其放入第二行的单元格中,并将按钮添加到此嵌套网格布局的第一个单元格中

很快,您需要将GridLayout转换为其他GridLayout


有更好的工具来实现这一点。首先看看GridBagLayout。这只是为了确保生活并不总是如此。然后看看其他解决方案,比如MigLayout。它不是JDK的一部分,但它确实是一个功能强大的工具,可以让您的生活更轻松。

请查看关于的教程

示例代码:

    JPanel pane = new JPanel();
    GridBagLayout gridbag  = new GridBagLayout();
    pane.setLayout(gridbag);
    GridBagConstraints c = new GridBagConstraints();

    final JTextField fileName = new JTextField();
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridwidth = 2;
    c.gridx = 0;
    c.gridy = 0;
    pane.add(fileName, c);

    JButton creater = new JButton("Create File");
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridwidth = 1;
    c.gridx = 0;
    c.gridy = 1;
    pane.add(creater, c);

    JButton deleter = new JButton("Delete File");
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridx = 1;
    pane.add(deleter, c);

在否定了第三方布局的建议之后,由于我对GBL怀有恶意的仇恨,我认为是时候“把我的代码放在我的嘴边”供公众审查(和否定)

此SSCCE使用嵌套布局

import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;

class SimpleLayoutTest {

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            public void run() {
                JPanel ui = new JPanel( new BorderLayout(20,20) );
                // I would go for an EmptyBorder here, but the filled
                // border is just to demonstrate where the border starts/ends
                ui.setBorder( new LineBorder(Color.RED,15) );

                // this should be a button that pops a JFileChooser, or perhaps
                // a JTree of the existing file system structure with a JButton
                // to prompt for the name of a new File.
                final JTextField fileName = new JTextField();
                ui.add(fileName, BorderLayout.NORTH);

                JPanel buttonPanel = new JPanel(new GridLayout(1, 0, 10, 30));
                ui.add(buttonPanel, BorderLayout.CENTER);

                JButton creater = new JButton("Create File");
                buttonPanel.add(creater);
                JButton deleter = new JButton("Delete File");
                buttonPanel.add(deleter);

                JOptionPane.showMessageDialog(null, ui);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

一个好的建议:远离标准布局管理器并使用一个好的建议:在放弃J2SE提供的或Oracle不支持的布局之前,先学习如何使用和嵌套标准布局。请注意,对于人们最熟悉的布局,您也更有可能在公共论坛上获得帮助,这将是J2SE的核心布局。