JFrame GridBagLayout组件定位
所以，我使用null布局，但被告知这是一个糟糕的主意，所以决定使用GridBagLayout，因为它应该是最容易定制的。我在定位我的组件时遇到了麻烦，我真的很困惑我如何在屏幕的顶部中间找到一个标签，我的桌子在中间，我的登录按钮在右下角。有谁知道怎么做？
这是我的代码：
import javafx.geometry.HorizontalDirection;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.*;
public class Main
{
JFrame window = new JFrame("PE Fixture"); //JFrame variables
JPanel container = new JPanel();
JPanel guestFixturesPanel = new JPanel();
JPanel loginPanel = new JPanel();
JPanel adminFixturesPanel = new JPanel();
JPanel createPanel = new JPanel();
String[] columns = {"Sport", "Location", "Date", "Result"};
String[][] data = {{"Football", "AQA Highschool", "12.11.13", "5 - 0"},
{"Tennis", "Wembley", "26.11.14.", "TBC"}};
CardLayout cardLayout = new CardLayout();
GridBagConstraints c = new GridBagConstraints();
public Main()
{
container.setLayout(cardLayout);
guestFixturesPanel.setLayout(new GridBagLayout()); //GUEST FIXTURES PANEL COMPONENTS
JButton loginButton = new JButton("Login");
c.gridx = 0;
c.gridy = 2;
c.insets = new Insets(0, 0, 10, 0);
guestFixturesPanel.add(loginButton, c);
JTable fixturesTable = new JTable(data, columns)
{
public boolean isCellEditable(int data, int columns)
{
return false;
}
};
fixturesTable.setPreferredScrollableViewportSize(new Dimension(500, 300));
fixturesTable.setFillsViewportHeight(true);
JScrollPane scrollTable = new JScrollPane(fixturesTable);
c.gridx = 0;
c.gridy = 0;
c.ipady = 700;
c.ipadx = 400;
guestFixturesPanel.add(scrollTable, c);
JLabel fixturesLabel = new JLabel("FIXTURES");
fixturesLabel.setFont(new Font("TimesRoman", Font.PLAIN, 50));
fixturesLabel.setForeground(Color.WHITE);
c.gridx = 0;
c.gridy = 0;
guestFixturesPanel.add(fixturesLabel, c);
container.add(guestFixturesPanel, "2"); //LABELS EACH COMPONENT WITH A NUMBER
container.add(loginPanel, "3");
container.add(adminFixturesPanel, "4");
container.add(createPanel, "5");
guestFixturesPanel.setBackground(Color.DARK_GRAY); //Colours each panel
loginPanel.setBackground(Color.DARK_GRAY);
adminFixturesPanel.setBackground(Color.DARK_GRAY);
createPanel.setBackground(Color.DARK_GRAY);
cardLayout.show(container, "1");
window.add(container); //Creates the frame of the program.
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setSize(500, 860);
window.setResizable(false);
window.setVisible(true);
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Main();
}
});
}
}
编辑：
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.*;
public class Main
{
String[] columns = {"Sport", "Location", "Date", "Result"};
String[][] data = {{"Football", "AQA Highschool", "12.11.13", "5 - 0"},
{"Tennis", "Wembley", "26.11.14.", "TBC"}};
private void createAndShowGUI()
{
CardLayout layout = new CardLayout();
JPanel guestCard = new JPanel(layout);
JPanel guestTitle = new JPanel(new FlowLayout(FlowLayout.CENTER)); //GUEST TOP PANEL
JLabel fixturesLabel = new JLabel("FIXTURES");
fixturesLabel.setFont(new Font("TimesRoman", Font.PLAIN, 50));
fixturesLabel.setForeground(Color.WHITE);
guestTitle.add(fixturesLabel);
JTable fixturesTable = new JTable(data, columns) //GUEST MID PANEL
{
public boolean isCellEditable(int data, int columns)
{
return false;
}
};
fixturesTable.setPreferredScrollableViewportSize(new Dimension(350, 450));
fixturesTable.setFillsViewportHeight(true);
JScrollPane scrollTable = new JScrollPane(fixturesTable);
JPanel guestBot = new JPanel(new FlowLayout(FlowLayout.RIGHT)); //GUEST BOT PANEL
JButton loginButtonGuest = new JButton("Login");
guestBot.add(loginButtonGuest);
JPanel loginCard = new JPanel(layout); //LOGIN TOP PANEL
JPanel loginTitle = new JPanel(new FlowLayout(FlowLayout.CENTER));
JLabel loginLabel = new JLabel("LOGIN");
loginLabel.setFont(new Font("TimesRoman", Font.PLAIN, 50));
loginLabel.setForeground(Color.WHITE);
loginTitle.add(loginLabel);
JPanel container = new JPanel(new BorderLayout(8,8)); //ADDS CARDS TO CONTAINER
container.add(guestCard, "2");
container.add(loginCard, "3");
guestCard.add(guestTitle, BorderLayout.NORTH); //ADDS COMPONENTS TO CARDS
guestCard.add(scrollTable, BorderLayout.CENTER);
guestCard.add(guestBot, BorderLayout.SOUTH);
loginCard.add(loginTitle, BorderLayout.NORTH);
container.setBackground(Color.DARK_GRAY); //COLOURS CARDS
guestTitle.setBackground(Color.DARK_GRAY);
scrollTable.setBackground(Color.DARK_GRAY);
guestBot.setBackground(Color.DARK_GRAY);
layout.show(container, "1");
JFrame window = new JFrame("PE Fixtures"); //CREATES WINDOW
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.getContentPane().add(container);
window.setSize(400, 700);
window.setLocationRelativeTo(null);
window.setResizable(false);
window.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Main().createAndShowGUI();
}
});
}
}
ERROR：
"C:\Program Files\Java\jdk1.7.0_51\bin\java" -Didea.launcher.port=7533 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 13.0.2\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.7.0_51\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\rt.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.7.0_51\jre\lib\ext\zipfs.jar;C:\Users\Harry\Desktop\Computer Science Projects\PE Fixtures v2.0\out\production\PE Fixtures v2.0;C:\Program Files (x86)\JetBrains\IntelliJ IDEA Community Edition 13.0.2\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain Main
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: cannot add to layout: unknown constraint: 2
at java.awt.BorderLayout.addLayoutComponent(BorderLayout.java:463)
at java.awt.BorderLayout.addLayoutComponent(BorderLayout.java:424)
at java.awt.Container.addImpl(Container.java:1120)
at java.awt.Container.add(Container.java:966)
at Main.createAndShowGUI(Main.java:48)
at Main.access$000(Main.java:8)
at Main$2.run(Main.java:77)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
1 个答案:
答案 0 :(得分：6)
我真的很困惑，我怎么能得到一个标签到顶部中间 屏幕，我的桌子在中间，我的登录按钮到底部 右。
正如您所看到的，GridBagLayout并不是最简单的布局管理器（太麻烦而且功能太大）。为了布置这些少量的组件，我建议你使用Nested Layout方法：
- 使用BorderLayout布局“主要”面板组件（标签，表格和按钮）。
- 使用FlowLayout将标签置于顶部面板的中央，然后将按钮置于底部面板的右侧。
实施例
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
public class Demo {
private void createAndShowGUI() {
JLabel label = new JLabel("Title");
label.setFont(label.getFont().deriveFont(Font.BOLD | Font.ITALIC, 18));
JPanel topPanel = new JPanel(new FlowLayout(FlowLayout.CENTER));
topPanel.add(label);
DefaultTableModel model = new DefaultTableModel(new Object[]{"Column # 1", "Column # 2"}, 0);
model.addRow(new Object[]{"Property # 1", "Value # 1"});
model.addRow(new Object[]{"Property # 2", "Value # 2"});
model.addRow(new Object[]{"Property # 3", "Value # 3"});
JTable table = new JTable(model);
JScrollPane scrollPane = new JScrollPane(table);
JButton button = new JButton("Log In");
JPanel bottomPanel = new JPanel(new FlowLayout(FlowLayout.RIGHT));
bottomPanel.add(button);
JPanel content = new JPanel(new BorderLayout(8, 8));
content.add(topPanel, BorderLayout.NORTH);
content.add(scrollPane, BorderLayout.CENTER);
content.add(bottomPanel, BorderLayout.SOUTH);
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(content);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Demo().createAndShowGUI();
}
});
}
}
截图
另外
对于更复杂的GUI设计，您可能需要尝试this answer中建议的其中一个第三方布局管理器：
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