这是一个测试程序,显示当 JTable 由 JScrollPane 保存并且 DefaultTableModel 的 DataVector 通过以下方式更改时setDataVector(...)
没有必要打电话fireTableDataChanged()
JTable 数据正确更改和正确查看的模型。
The program GUI looks like the images below.
Before Data Changed:
After Data Changed:
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
@SuppressWarnings("serial")
public class ScrollPaneRefresh extends JPanel {
private static final int PREF_W = 600;
private static final int PREF_H = 200;
private Integer[][] initialData = {
{1, 2}, {3, 4}, {5, 6}, {7, 8}, {9, 0},
{1, 2}, {3, 4}, {5, 6}, {7, 8}, {9, 0},
{1, 2}, {3, 4}, {5, 6}, {7, 8}, {9, 0}
};
private Integer[][] newData = {
{1, 2}, {3, 4}
};
private String[] columnNames = {"Col1", "Col2"};
private TablePanel gregsPanel = new TablePanel("With fireTableDataChanged", initialData, columnNames);
private TablePanel myPanel = new TablePanel("Without fireTableDataChanged", initialData, columnNames);
public ScrollPaneRefresh() {
gregsPanel.setButtonAction(new AbstractAction("Change Table Data") {
private boolean changeToNewData = true;
@Override
public void actionPerformed(ActionEvent evt) {
if (changeToNewData) {
gregsPanel.setTableModelDataVector(newData, columnNames);
} else {
gregsPanel.setTableModelDataVector(initialData, columnNames);
}
gregsPanel.fireTableDataChanged();
changeToNewData = !changeToNewData;
}
});
myPanel.setButtonAction(new AbstractAction("Change Table Data") {
private boolean changeToNewData = true;
@Override
public void actionPerformed(ActionEvent evt) {
if (changeToNewData) {
myPanel.setTableModelDataVector(newData, columnNames);
} else {
myPanel.setTableModelDataVector(initialData, columnNames);
}
// myPanel.getScrollPane().getViewport().revalidate();
changeToNewData = !changeToNewData;
}
});
setLayout(new GridLayout(1, 0));
add(gregsPanel.getMainPanel());
add(myPanel.getMainPanel());
}
@Override // so scrollbars will show
public Dimension getPreferredSize() {
return new Dimension(PREF_W, PREF_H);
}
private static void createAndShowGui() {
ScrollPaneRefresh mainPanel = new ScrollPaneRefresh();
JFrame frame = new JFrame("ScrollPaneRefresh");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
class TablePanel {
private JPanel mainPanel = new JPanel();
private DefaultTableModel dm;
private JTable table = new JTable();
private JButton changeTableBtn = new JButton();
private JScrollPane scrollpane = new JScrollPane(table);
public TablePanel(String title, Object[][] data, Object[] columnNames) {
dm = new DefaultTableModel(data, columnNames);
table.setModel(dm);
JPanel btnPanel = new JPanel();
btnPanel.add(changeTableBtn);
mainPanel.setBorder(BorderFactory.createTitledBorder(title));
mainPanel.setLayout(new BorderLayout(5, 5));
mainPanel.add(scrollpane, BorderLayout.CENTER);
mainPanel.add(btnPanel, BorderLayout.PAGE_END);
}
public void setButtonAction(Action action) {
changeTableBtn.setAction(action);
}
public void setTableModelDataVector(Object[][] data, Object[] columnNames) {
dm.setDataVector(data, columnNames);
}
public void fireTableDataChanged() {
dm.fireTableDataChanged();
}
public JScrollPane getScrollPane() {
return scrollpane;
}
public JComponent getMainPanel() {
return mainPanel;
}
}
我上面的示例的不足之处在于它没有重现原始发布者的问题,我认为这是由于我们使用了 SpringLayout,他没有完全描述或显示代码:
我有一个 JTable,与 DefaultTableModel 关联,位于 JPanel 中,SpringLayout 位于 JScrollPane 中。
为了获得更多更好的帮助,OP 必须创建自己的sscce http://sscce.org与我上面发布的内容类似(或更简单)。或者,或者通过不使用 SpringLayout 来保存 JTable 而是直接将其添加到 JScrollPane 的视口视图或使用 JPanel 将其添加到 BorderLayout(注意还要添加 JTable 的标头)并将其添加到 JScrollPane 的视口视图来解决他的问题视口视图。