我有以下由一个按钮和一个 JScrollPane 组成的 JPanel。
当按下按钮时,我希望它在 JScrollPane 内的 JPanel 中添加一个新行。问题是什么都没有出现。我的代码如下,我完全被难住了。
// swing imports
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JCheckBox;
import javax.swing.JButton;
import javax.swing.JScrollPane;
// awt imports
import java.awt.Color;
import java.awt.Insets;
import java.awt.BorderLayout;
import java.awt.GridBagLayout;
import java.awt.GridBagConstraints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class DBPediaPanel extends JPanel {
private JScrollPane scrollPane;
private JPanel scrollContent;
private JButton btnAcceptAll;
private int currentRow = 0;
public DBPediaPanel() {
this.setLayout(new BorderLayout());
this.setBackground(Color.BLACK);
this.add(getScrollPane(), BorderLayout.CENTER);
btnAcceptAll = new JButton("Add Row");
btnAcceptAll.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addStringToList("row " + currentRow);
System.out.println("test");
}
});
this.add(btnAcceptAll, BorderLayout.SOUTH);
}
private JScrollPane getScrollPane() {
scrollContent = new JPanel(new GridBagLayout());;
scrollPane = new JScrollPane(scrollContent);
return scrollPane;
}
private GridBagConstraints createGbc(int x, int y) {
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = x;
gbc.gridy = y;
gbc.gridwidth = 1;
gbc.gridheight = 1;
gbc.anchor = (x == 0) ? GridBagConstraints.WEST : GridBagConstraints.EAST;
//gbc.fill = (x == 0) ? GridBagConstraints.NONE : GridBagConstraints.HORIZONTAL;
gbc.insets = (y == 0) ? new Insets(3, 5, 3, 5) : new Insets(0, 5, 3, 5);
gbc.weightx = (x == 0) ? 0.1 : 1.0;
gbc.weighty = 1.0;
return gbc;
}
public void addStringToList(String str) {
System.out.println("in addStringToList");
System.out.println("attempting to add " + str + " to the list");
GridBagConstraints gbc = createGbc(0, currentRow);
scrollContent.add(new JCheckBox(), gbc);
gbc = createGbc(1, currentRow);
scrollContent.add(new JTextField(str), gbc);
scrollContent.repaint();
scrollPane.repaint();
currentRow++;
}
}