[英]Incorrect JPanel position in GridBagLayout
我使用GridBag在JScrollPane中顯示一些帶有圖像的JPanel。 當有3個或更多圖像時,GridBagConstraints工作正常但是當我有1或2時,它們會與JScrollPane的中心對齊,而不是在頂部的位置(如在圖庫中)這是我的代碼:
JPanel jPanel1 = new JPanel();
GridBagLayout layout = new GridBagLayout();
jPanel1.setLayout(layout);
GridBagConstraints gbc = new GridBagConstraints();
JPanel photo = new JPanel();
Dimension d = new Dimension(100,100);
photo.setPreferredSize(d);
gbc.insets = new Insets(0,3,3,3);
gbc.gridx = i;
gbc.gridy = j;
jPanel1.add(photo, gbc);
jScrollPane1.setViewportView(jPanel1);
我省略了將圖像分配給照片Jpanel的部分。 我希望JPanels在他們的位置保持靜態,如果有空閑空間則不對齊。 如果我不清楚我可以上傳幾個快照。 謝謝!
GridBagLayout
其組件布局在容器的中心周圍,這是它(有時令人討厭的)默認功能。
您可以嘗試在GridBagConstraints
中其他組件的右下方位置添加一個空的“填充”組件(比如一個JLabel
),其中GridBagConstraints
的weightx=1
, weighty=1
。 這將迫使他們到容器的頂部/左角......
更新...
中心/默認...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class GridBagLayoutTest {
public static void main(String[] args) {
new GridBagLayoutTest();
}
public GridBagLayoutTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.setSize(600, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
JLabel picture = new JLabel();
try {
picture.setIcon(new ImageIcon(ImageIO.read(new File("/path/to/your/picture"))));
} catch (IOException ex) {
ex.printStackTrace();
picture.setText("Bad picture");
}
add(picture, gbc);
}
}
}
不結盟...
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class GridBagLayoutTest {
public static void main(String[] args) {
new GridBagLayoutTest();
}
public GridBagLayoutTest() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.setSize(600, 600);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
JLabel picture = new JLabel();
try {
picture.setIcon(new ImageIcon(ImageIO.read(new File("/path/to/your/picture"))));
} catch (IOException ex) {
ex.printStackTrace();
picture.setText("Bad picture");
}
add(picture, gbc);
JLabel filler = new JLabel();
gbc.gridx = 1;
gbc.gridy = 1;
gbc.weightx = 1;
gbc.weighty = 1;
add(filler, gbc);
}
}
}
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