Java 将页面右上角的组件与GridBagLayout Manager对齐
我试图创建一个类似facebook的登录页面，但我编写的代码并没有显示在页面的左上方，而是显示在页面的中心，我使用GridBagLayout和anchore在第一行设置文本Java 将页面右上角的组件与GridBagLayout Manager对齐,java,swing,layout,jpanel,gridbaglayout,Java,Swing,Layout,Jpanel,Gridbaglayout,我试图创建一个类似facebook的登录页面，但我编写的代码并没有显示在页面的左上方，而是显示在页面的中心，我使用GridBagLayout和anchore在第一行设置文本 final JFrame f2=new JFrame("Admin Main"); f2.setSize(1350,730); f2.setVisible(true); f1.setVisible(fals
final JFrame f2=new JFrame("Admin Main");
f2.setSize(1350,730);
f2.setVisible(true);
f1.setVisible(false);
f2.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);![enter image description here][2]
GridBagLayout gbl=new GridBagLayout();
final JPanel p2=new JPanel(gbl){
private Image img = ImageIO.read(new File("F:\\Untitled Folder\\Rohan\\football2.jpg"));
@Override
protected void paintComponent( Graphics g ) {
super.paintComponent(g);
g.drawImage(img, 0,0,1366,730, null);
}
};;
GridBagConstraints g2=new GridBagConstraints();
g2.insets=new Insets(3,3,3,3);
JLabel l2=new JLabel("Admin ID",JLabel.LEFT);
JLabel l3=new JLabel("Password",JLabel.LEFT);
l2.setFont(new Font("TimesRoman",Font.BOLD,16));
l2.setForeground(Color.BLUE);
l2.setBackground(Color.WHITE);
l3.setFont(new Font("TimesRoman",Font.BOLD,16));
l3.setForeground(Color.BLUE);
l3.setBackground(Color.WHITE);
final JTextField t1=new JTextField(15);
final JPasswordField pw1=new JPasswordField(15);
JButton b3=new JButton("Back");
JButton b4=new JButton("Sign in");
f2.add(p2);
g2.anchor=GridBagConstraints.FIRST_LINE_END;
g2.gridx=1;
g2.gridy=1;
p2.add(l2,g2);
g2.gridx=2;
g2.gridy=1;
p2.add(t1,g2);
g2.gridx=1;
g2.gridy=2;
p2.add(l3,g2);
g2.gridx=2;
g2.gridy=2;
p2.add(pw1,g2);
g2.gridx=1;
g2.gridy=3;
p2.add(b3,g2);
g2.gridx=2;
g2.gridy=3;
p2.add(b4,g2);
如果您希望它明确位于左上角，我宁愿使用西北锚。从左向右流动的文本的第一行结尾也会将文本放在右角，而从右向左流动的文本则相反 另外，将gridx和gridy切换为从0开始，而不是从1开始。并根据需要从中递增 例如：
g2.anchor=GridBagConstraints.NORTHWEST;
g2.gridx=0;
g2.gridy=0;
p2.add(l2,g2);
g2.gridx=1;
g2.gridy=0;
p2.add(t1,g2);
/*And so on for the rest of the block*/
使用第一条线作为锚定值
g2.anchor=GridBagConstraints.FIRST_LINE_START;
我发现您当前的布局存在两个问题：
边框布局的中心（这样您的面板就会拉伸到其容器的大小）GridBagLayoutGridBagLayoutimport java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.net.MalformedURLException;
import java.net.URL;
import javax.swing.Box;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class TestLoginGridBagLayout {
protected void initUI() throws MalformedURLException {
JFrame frame = new JFrame("Admin Main");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JLabel background = new JLabel(new ImageIcon(new URL(
"http://media1.santabanta.com/full1/Football/Football%20Abstract/football-abstract-6a.jpg"))) {
@Override
public Dimension getPreferredSize() {
Dimension preferredSize = super.getPreferredSize();
Dimension layoutPreferredSize = super.preferredSize();
preferredSize.width = Math.max(preferredSize.width, layoutPreferredSize.width);
preferredSize.height = Math.max(preferredSize.height, layoutPreferredSize.height);
return preferredSize;
}
};
background.setLayout(new BorderLayout());
frame.add(background);
GridBagLayout gbl = new GridBagLayout();
final JPanel loginPanel = new JPanel(gbl);
loginPanel.setOpaque(false);
background.add(loginPanel, BorderLayout.WEST);
JLabel adminIDLabel = new JLabel("Admin ID", JLabel.LEFT);
JLabel passwordLabel = new JLabel("Password", JLabel.LEFT);
adminIDLabel.setFont(new Font("TimesRoman", Font.BOLD, 16));
adminIDLabel.setForeground(Color.BLUE);
adminIDLabel.setBackground(Color.WHITE);
passwordLabel.setFont(new Font("TimesRoman", Font.BOLD, 16));
passwordLabel.setForeground(Color.BLUE);
passwordLabel.setBackground(Color.WHITE);
final JTextField adminID = new JTextField(15);
final JPasswordField password = new JPasswordField(15);
JPanel buttonPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING));
buttonPanel.setOpaque(false);
JButton back = new JButton("Back");
JButton signIn = new JButton("Sign in");
buttonPanel.add(back);
buttonPanel.add(signIn);
GridBagConstraints gbc = new GridBagConstraints();
gbc.insets = new Insets(3, 3, 3, 3);
gbc.anchor = GridBagConstraints.FIRST_LINE_END;
loginPanel.add(adminIDLabel, gbc);
gbc.gridwidth = GridBagConstraints.REMAINDER;
loginPanel.add(adminID, gbc);
gbc.gridwidth = 1;
loginPanel.add(passwordLabel, gbc);
gbc.gridwidth = GridBagConstraints.REMAINDER;
loginPanel.add(password, gbc);
loginPanel.add(buttonPanel, gbc);
GridBagConstraints gbcFiller = new GridBagConstraints();
gbcFiller.weightx = 1.0;
gbcFiller.weighty = 1.0;
gbcFiller.fill = GridBagConstraints.BOTH;
loginPanel.add(Box.createGlue(), gbcFiller);
frame.pack();
frame.setVisible(true);
}
/**
* @param args
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
new TestLoginGridBagLayout().initUI();
} catch (MalformedURLException e) {
e.printStackTrace();
}
}
});
}
}
- 将变量重命名为有意义的名称（这使您的代码更易于他人阅读）
- 将自定义背景图像面板替换为
JLabel - 使用另一个
LayoutManager - 再拍一张背景图片，因为我没有你的
gridx/gridygridwidth/gridheightGridBagConstraints.rementsNORTHWESTgridx/gridygridwith=rementsgridwidth=1