[英]Multiple Panels Below Each Other
我可以有一个用于登录的顶部面板吗? 然后是下面的中间和底部面板。 我正在使用 gridbaglayout 并分配了 2 个面板。 一个面板链接了用于登录详细信息的组件,另一个面板链接了其他组件。 但是,计划不会发生。 我试过使用 Box/Borderlayout 来做到这一点,但后来我无法创建我想要的间距。
这是我想要的草图。
public class GUI extends JFrame{
private JPanel myTopPL, myTopPL2;
private JTextField myUsernameTF;
private JTextField myPasswordTF;
private JTextField myMessageTF;
private JLabel myUsernameLBL;
private JLabel myPasswordLBL;
private JLabel myItemsLBL;
private JTextArea myMainTA;
private JButton myLoginBN;
private JButton myConnectBN;
private JButton mySendBN;
private JComboBox myItemsCB;
public GUI () {
super("GUI ");
setLayout(new GridBagLayout());
myTopPL = new JPanel();
myTopPL2 = new JPanel();
myTopPL.setLayout(new GridBagLayout());
myTopPL2.setLayout(new GridBagLayout());
GridBagConstraints myTopPLGBC = new GridBagConstraints();
myTopPLGBC.weightx = 1;
myTopPLGBC.weighty = 1;
GridBagConstraints myTopPLGBC2 = new GridBagConstraints();
myTopPLGBC.weightx = 2;
myTopPLGBC.weighty = 2;
myUsernameLBL = new JLabel("Username: ");
myUsernameLBL.setFont(new Font("Arial", Font.BOLD, 13));
myTopPLGBC.gridx = 1;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myUsernameLBL, myTopPLGBC);
myUsernameTF = new JTextField(10);
myTopPLGBC.gridx = 2;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myUsernameTF,myTopPLGBC);
myPasswordLBL = new JLabel("Password: ");
myPasswordLBL.setFont(new Font("Arial", Font.BOLD, 13));
myTopPLGBC.gridx = 3;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myPasswordLBL, myTopPLGBC);
myPasswordTF = new JTextField(10);
myTopPLGBC.gridx = 4;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myPasswordTF,myTopPLGBC);
myLoginBN = new JButton("Login");
myTopPLGBC.gridx = 5;
myTopPLGBC.gridy = 1;
myTopPLGBC.insets = new Insets(5,5,5,5);
myTopPL.add(myLoginBN,myTopPLGBC);
myItemsLBL = new JLabel("Items: ");
myItemsLBL.setFont(new Font("Arial", Font.BOLD, 13));
myTopPLGBC2.gridx = 1;
myTopPLGBC2.gridy = 3;
myTopPLGBC2.insets = new Insets(5,5,5,5);
myTopPL2.add(myItemsLBL, myTopPLGBC2);
myItemsCB = new JComboBox();
myItemsCB.addItem(" Select an Item ");
myTopPLGBC2.gridx = 1;
myTopPLGBC2.gridy = 4;
myTopPLGBC2.insets = new Insets(5,5,5,5);
myTopPL2.add(myItemsCB, myTopPLGBC2);
myConnectBN = new JButton("Connect");
myTopPLGBC2.gridx = 2;
myTopPLGBC2.gridy = 4;
myTopPLGBC2.insets = new Insets (5,5,5,5);
myTopPL2.add(myConnectBN, myTopPLGBC2);
GridBagConstraints GBC = new GridBagConstraints();
GBC.anchor = GridBagConstraints.NORTHWEST;
GBC.weightx = 1;
GBC.weighty = 1;
this.add(myTopPL,GBC);
GridBagConstraints GBC2 = new GridBagConstraints();
GBC2.anchor = GridBagConstraints.NORTHWEST;
GBC2.weightx = 2;
GBC2.weighty = 2;
this.add(myTopPL2,GBC2);
}
public static void main(String[] args) {
GUI GUI = new GUI ();
GUI .setDefaultCloseOperation(RMIAuctionHouse.EXIT_ON_CLOSE);
GUI .setSize(750,500);
GUI .setVisible(true);
}
}
我会将应用程序分解为它的各个职责领域,并专注于创建 UI 元素来支持它。 这将使您能够专注于应用程序每个部分的需求,它还使您有机会根据需要更改布局
public class TestLayout15 {
public static void main(String[] args) {
new TestLayout15();
}
public TestLayout15() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Test");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new MainPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class MainPane extends JPanel {
private JTextField messageField;
private JButton sendButton;
public MainPane() {
setBorder(new EmptyBorder(4, 4, 4, 4));
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(new LoginPane(), gbc);
gbc.gridy++;
add(new ConnectPane(), gbc);
gbc.gridy++;
gbc.weighty = 1;
gbc.fill = GridBagConstraints.BOTH;
add(new JScrollPane(new JTextArea(5, 20)), gbc);
gbc.gridwidth = 1;
messageField = new JTextField(10);
sendButton = new JButton("Send");
gbc.gridy++;
gbc.weighty = 0;
gbc.fill = GridBagConstraints.HORIZONTAL;
add(messageField, gbc);
gbc.gridx++;
gbc.weightx = 0;
add(sendButton, gbc);
}
}
public class ConnectPane extends JPanel {
private JComboBox comboBox;
private JButton connectButton;
public ConnectPane() {
comboBox = new JComboBox();
connectButton = new JButton("Connect");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
add(comboBox, gbc);
gbc.gridx++;
gbc.weightx = 1;
add(connectButton, gbc);
}
}
public class LoginPane extends JPanel {
private JTextField userNameField;
private JPasswordField passwordField;
private JButton loginButton;
public LoginPane() {
userNameField = new JTextField(10);
passwordField = new JPasswordField(10);
loginButton = new JButton("Login");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
add(new JLabel("User name:"), gbc);
gbc.gridx++;
add(userNameField, gbc);
gbc.gridx++;
add(new JLabel("Password:"), gbc);
gbc.gridx++;
add(passwordField, gbc);
gbc.gridx++;
gbc.weightx = 1;
add(loginButton, gbc);
}
}
}
首先,用GUI.pack()
替换对GUI.setSize(750,500)
的调用。 这将调整窗口大小以适合您的内容。 这样做之后,您会看到第二个面板出现在第一个面板的右侧。 这是因为你没有设置gridx
/ gridy
上GBC2
所以它默认为把myTopPL2
到右侧myTopPL1
,不能低于它。
使用GridBagLayout
时,我很少明确设置gridx
/ gridy
。 对于显示的第一行,除了myLoginBN
,我将使用默认值,其中我将gridwidth
设置为GridBagConstraints.REMAINDER
。 这告诉 GridBagLayout 该行没有其他内容。 添加了默认 gbc 的下一个项目将放置在第二行的开头。
小尼特:
使用 SwingUtilities.InvokeLater 在 EDT 上启动 Gui
SwingUtilities.invokeLater(new Runnable() { public void run() { GUI GUI = new GUI (); GUI .setDefaultCloseOperation(RMIAuctionHouse.EXIT_ON_CLOSE); GUI .setSize(750,500); GUI .setVisible(true); }});
似乎您不熟悉 Java 布局,因此我建议您尝试使用 null(absolute) 布局:
setLayout(null);
...
component.setBounds( x, y, width, heigh );
add(component);
这里的例子
package gui;
import java.awt.Font;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class GUI extends JFrame{
private JTextField myUsernameTF;
private JLabel myUsernameLBL;
public GUI() {
super("GUI ");
setLayout(null);
myUsernameLBL = new JLabel("Username: ");
myUsernameLBL.setFont(new Font("Arial", Font.BOLD, 13));
myUsernameLBL.setBounds(50,30,80,20);
add(myUsernameLBL);
myUsernameTF = new JTextField(10);
myUsernameTF.setBounds(190,30,80,20);
add(myUsernameTF);
// and so on ...
}
public static void main(String[] args) {
GUI frame = new GUI();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(750,500);
frame.setVisible(true);
}
}
祝你在处理 java swing 的棘手方式上好运 =)
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