4
我在JScrollPane中有一个JTable，并且我重写了getPreferredScrollableViewportSize以便将JScrollPane适合固定数量的表行，从而允许在需要时显示滚动条。 我还使用SO上的部分代码来调整表格列的大小以适应其内容。正确重写getPreferredScrollableViewportSize
我遇到的问题是，当我dinamically向表中添加更宽的行时，水平JScrollBar不显示。我尝试了不同的方法来强制JTable，JViewport和JScrollPane正确更新，调用revalidate（）或repaint（），doLayout（）等，但我没有成功。
当然，我可以回想起JFrame中的pack（）方法，但它会导致整个滚动窗口的宽度增加，并且水平滚动条仍然不会出现。
我失踪了什么？
这里有一个MVCE，它只是一个丑陋的玩具的例子，但它应该足以复制不想要的行为。
感谢您的帮助！
代码：
import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.table.*;
public class Main
{
public static void main (String [] a) {
SwingUtilities.invokeLater (new Runnable() {
public void run() {
initGUI();
}
});
}
private static void initGUI() {
final DataTable table = new DataTable();
JPanel container = new JPanel (new BorderLayout (0, 20));
container.add (new JScrollPane (table));
container.add (new JButton (new AbstractAction ("Add wider row") {
public void actionPerformed (ActionEvent e) {
table.addRow();
// some of many useless attempts ...
// table.resizeColumnWidth();
// table.revalidate();
}
}), BorderLayout.SOUTH);
container.setBorder (new EmptyBorder (10, 10, 10, 10));
JFrame frame = new JFrame ("Test");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.setResizable (false);
frame.setContentPane (container);
frame.setLocationRelativeTo (null);
frame.pack();
frame.setVisible (true);
}
}
class DataTable extends JTable
{
private static final int VISIBLE_ROWS = 5;
DataTable() {
String [][] data = new String [][] {
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"}
};
setModel (new DefaultTableModel (data, new String [] {"", ""}) {
@Override public boolean isCellEditable (int row, int column) {
return false;
}
});
columnModel.setColumnMargin (20);
setBorder (null);
setFocusable (false);
setRowSelectionAllowed (false);
setShowGrid (false);
setTableHeader (null);
resizeColumnWidth();
}
public void addRow() {
((DefaultTableModel) getModel()).addRow (new String [] {"SomeLongerText", "SomeLongerText"});
}
private int calculateColumnWidth (int column) {
TableColumn tableColumn = columnModel.getColumn (column);
int width = 0;
for (int row=0; row<getRowCount(); row++) width = Math.max (prepareRenderer (getCellRenderer (row, column), row, column).getPreferredSize().width, width);
return width + getIntercellSpacing().width;
}
@Override public Dimension getPreferredScrollableViewportSize() {
int columnsWidth = 0;
for (int column=0; column<getColumnCount(); column++) columnsWidth += calculateColumnWidth (column);
return new Dimension (columnsWidth, VISIBLE_ROWS * getRowHeight());
}
protected void resizeColumnWidth() {
for (int column=0; column<getColumnCount(); column++) columnModel.getColumn (column).setPreferredWidth (calculateColumnWidth (column));
}
}
编辑：
感谢@camickr，我解决了这个问题，设置所需的自动调整模式，每加一排一次回顾resizeColumnWidth方法。 我已经分开审讯他们，我不能相信我没有使用这两个:)
Hovewer，我发布更新的代码下面，现在它工作得很好：
import java.awt.*;
import java.awt.event.ActionEvent;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.table.*;
public class Main
{
public static void main (String [] a) {
SwingUtilities.invokeLater (new Runnable() {
public void run() {
initGUI();
}
});
}
private static void initGUI() {
final DataTable table = new DataTable();
JPanel container = new JPanel (new BorderLayout (0, 20));
container.add (new JScrollPane (table));
container.add (new JButton (new AbstractAction ("Add wider row") {
public void actionPerformed (ActionEvent e) {
table.addRow();
}
}), BorderLayout.SOUTH);
container.setBorder (new EmptyBorder (10, 10, 10, 10));
JFrame frame = new JFrame ("Test");
frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
frame.setResizable (false);
frame.setContentPane (container);
frame.setLocationRelativeTo (null);
frame.pack();
frame.setVisible (true);
}
}
class DataTable extends JTable
{
private static final int VISIBLE_ROWS = 5;
DataTable() {
String [][] data = new String [][] {
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"},
{"SomeText", "SomeText"}
};
setModel (new DefaultTableModel (data, new String [] {"", ""}) {
@Override public boolean isCellEditable (int row, int column) {
return false;
}
});
columnModel.setColumnMargin (20);
setAutoResizeMode (AUTO_RESIZE_OFF);
setBorder (null);
setFocusable (false);
setRowSelectionAllowed (false);
setShowGrid (false);
setTableHeader (null);
resizeColumnWidth();
}
public void addRow() {
((DefaultTableModel) getModel()).addRow (new String [] {"SomeLongerText", "SomeLongerText"});
resizeColumnWidth();
}
private int calculateColumnWidth (int column) {
TableColumn tableColumn = columnModel.getColumn (column);
int width = 0;
for (int row=0; row<getRowCount(); row++) width = Math.max (prepareRenderer (getCellRenderer (row, column), row, column).getPreferredSize().width, width);
return width + getIntercellSpacing().width;
}
@Override public Dimension getPreferredScrollableViewportSize() {
int columnsWidth = 0;
for (int column=0; column<getColumnCount(); column++) columnsWidth += calculateColumnWidth (column);
return new Dimension (columnsWidth, VISIBLE_ROWS * getRowHeight());
}
protected void resizeColumnWidth() {
for (int column=0; column<getColumnCount(); column++) columnModel.getColumn (column).setPreferredWidth (calculateColumnWidth (column));
}
}
感谢您发布MCVE与您的问题。 （+1），当然也适用于camickr。 –