我正在尝试创建一个简单的电子邮件客户端,但正文的底部被切断。如果我添加水平滚动条,它不会出现,垂直滚动条的底部也不会出现。
这是我的代码:
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
@SuppressWarnings("serial")
public class gui extends JFrame{
gui(String title, int x, int y){
super(title);
setSize(x,y);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setResizable(false);
}
public void addElements(){
Font size30 = new Font(null, Font.PLAIN, 30);
JPanel pnl = new JPanel();
Container contentPane = getContentPane();
//--- User Info ---//
JPanel userInfo = new JPanel();
JLabel userLabel = new JLabel("Username: ");
JTextField userField = new JTextField(12);
userInfo.add(userLabel);
userInfo.add(userField);
JLabel passLabel = new JLabel("Password: ");
JTextField passField = new JTextField(10);
userInfo.add(passLabel);
userInfo.add(passField);
JLabel serverLabel = new JLabel("Mail Server: ");
JTextField serverField = new JTextField(10);
userInfo.add(serverLabel);
userInfo.add(serverField);
JLabel portLabel = new JLabel("Server Port: ");
JTextField portField = new JTextField(3);
userInfo.add(portLabel);
userInfo.add(portField);
//--- To: CC: and Subject Fields ---//
JPanel msgInfo = new JPanel();
JLabel toLabel = new JLabel("To: ");
JTextField toField = new JTextField(30);
msgInfo.add(toLabel);
msgInfo.add(toField);
JLabel subLabel = new JLabel("Subject: ");
JTextField subField = new JTextField(30);
msgInfo.add(subLabel);
msgInfo.add(subField);
//--- Body ---//
JPanel bodyPnl = new JPanel(new BorderLayout(10,10));
JLabel bodyLabel = new JLabel("Body");
bodyLabel.setFont(size30);
JTextArea bodyField = new JTextArea(30,70);
bodyField.setLineWrap(true);
bodyField.setWrapStyleWord(true);
JScrollPane bodyScroll = new JScrollPane(bodyField);
bodyScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
bodyScroll.setBounds(getX(), getY(), bodyField.getWidth(), bodyField.getHeight());
bodyPnl.add("South",bodyScroll);
pnl.add(userInfo);
pnl.add(msgInfo);
pnl.add(bodyLabel);
pnl.add(bodyScroll);
contentPane.add("North", pnl);
setVisible(true);
}
}
在我的主类中,我只是创建一个新的 gui,然后调用 addElements() 函数。
最佳答案
FlowLayout
不能很好地“换行”。考虑不同的布局,例如 GridBagLayout
...
此外,请停止“尝试”在用户界面上强制指定尺寸,您没有足够的控制力来控制影响尺寸的因素来执行此操作。
相反,依赖布局管理器和 API 功能。例如,不要在框架上调用 setSize
,而是调用 pack
...我很快就会发布,但我花了这么长时间才找到该调用...我我挠头想知道为什么 UI 不会按照我预期的方式布局......
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import javax.swing.JFrame;
import static javax.swing.JFrame.EXIT_ON_CLOSE;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;
public class Test extends JFrame {
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
Test frame = new Test("Testing", 400, 400);
}
});
}
Test(String title, int x, int y) {
super(title);
setDefaultCloseOperation(EXIT_ON_CLOSE);
addElements();
pack();
setVisible(true);
// setResizable(false);
}
public void addElements() {
Font size30 = new Font(null, Font.PLAIN, 30);
//--- User Info ---//
JPanel userInfo = new JPanel(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(2, 2, 4, 2);
gbc.gridx = 0;
gbc.gridy = 0;
JLabel userLabel = new JLabel("Username: ");
JTextField userField = new JTextField(12);
userInfo.add(userLabel, gbc);
gbc.gridx++;
userInfo.add(userField, gbc);
JLabel passLabel = new JLabel("Password: ");
JTextField passField = new JTextField(10);
gbc.gridx++;
userInfo.add(passLabel, gbc);
gbc.gridx++;
userInfo.add(passField, gbc);
JLabel serverLabel = new JLabel("Mail Server: ");
JTextField serverField = new JTextField(10);
gbc.gridx++;
userInfo.add(serverLabel, gbc);
gbc.gridx++;
userInfo.add(serverField, gbc);
JLabel portLabel = new JLabel("Server Port: ");
JTextField portField = new JTextField(3);
gbc.gridx++;
userInfo.add(portLabel, gbc);
gbc.gridx++;
userInfo.add(portField, gbc);
gbc = new GridBagConstraints();
gbc.insets = new Insets(2, 2, 4, 2);
gbc.gridx = 0;
gbc.gridy = 0;
//--- To: CC: and Subject Fields ---//
JPanel msgInfo = new JPanel(new GridBagLayout());
JLabel toLabel = new JLabel("To: ");
JTextField toField = new JTextField(30);
msgInfo.add(toLabel, gbc);
gbc.gridx++;
msgInfo.add(toField, gbc);
JLabel subLabel = new JLabel("Subject: ");
JTextField subField = new JTextField(30);
gbc.gridx++;
msgInfo.add(subLabel, gbc);
gbc.gridx++;
msgInfo.add(subField, gbc);
//--- Body ---//
// JPanel bodyPnl = new JPanel(new GridBagLayout());
// gbc = new GridBagConstraints();
// gbc.insets = new Insets(2, 2, 4, 2);
// gbc.gridx = 0;
// gbc.gridy = 0;
JLabel bodyLabel = new JLabel("Body");
bodyLabel.setHorizontalAlignment(JLabel.CENTER);
bodyLabel.setFont(size30);
JTextArea bodyField = new JTextArea(30, 70);
bodyField.setLineWrap(true);
bodyField.setWrapStyleWord(true);
JScrollPane bodyScroll = new JScrollPane(bodyField);
bodyScroll.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
// bodyScroll.setBounds(getX(), getY(), bodyField.getWidth(), bodyField.getHeight());
setLayout(new GridBagLayout());
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(userInfo, gbc);
gbc.gridy++;
add(msgInfo, gbc);
gbc.gridy++;
gbc.insets = new Insets(10, 10, 4, 10);
add(bodyLabel, gbc);
gbc.gridy++;
gbc.insets = new Insets(4, 10, 10, 10);
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
add(bodyScroll, gbc);
}
}
关于java - JScrollPane 的底部被切断,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25256052/