在旁边的另一个JTable上继续JTable数据，而不是滚动
我有一个显示200多行的JTable。 我想在JPanel中显示所有行，以便用户不必向下滚动。
我试图在第一个表中获取可见行的数量，并使用viewport添加其余行的另一个JTable，如https://coderanch.com/t/340707/java/find-visible-row-count- JTable中。
但是，该方法仅在面板被绘制并且对用户可见后才返回可见行的数量。 所以我不能将另一个JTable动态添加到同一个面板。
以下是我用来实现上述要求的代码，但只有在单击按钮时才会添加新表。 我试图根据lastTable中的可见行动态地添加表，但如上所述，直到表出现在视口中，我才得到正确的可见行数。
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.ScrollPaneConstants;
import javax.swing.table.AbstractTableModel;
public class DataPanel extends JPanel{
/**
*
*/
private static final long serialVersionUID = 1L;
List data = new ArrayList();
JScrollPane scrollPane;
JTable table, lastTable;
JPanel boxPanel;
int rows = 0;
public DataPanel()
{
for (int i = 0; i newData = getData(rows);
DataModel newModel = new DataModel(newData);
JTable newTable = new JTable(newModel);
lastTable = newTable;
JScrollPane newScrollPane = new JScrollPane(newTable);
newScrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
boxPanel.add(newScrollPane);
}
}
private List getData(int rows) {
// TODO Auto-generated method stub
List newData = new ArrayList();
for(int i=0; i= rows)
{
newData.add(data.get(i));
}
}
return newData;
}
private int getVisibleRowCount(JTable table)
{
JViewport viewport = (JViewport) table.getParent();
Dimension extentSize = viewport.getExtentSize(); // JViewport
int visibleRows = extentSize.height/table.getRowHeight();
return visibleRows;
}
public static void main(String args[])
{
new DataPanel();
}
private class DataModel extends AbstractTableModel{
static final int COL1_INDEX = 0;
static final int COL2_INDEX = 1;
private final String[] COLUMN_NAMES = new String[]
{"ID", "Name"};
private List data = new ArrayList();
public DataModel(List newData)
{
data = newData;
}
public List getData() {
return data;
}
public void setData(List data) {
this.data = data;
}
@Override
public int getColumnCount() {
// TODO Auto-generated method stub
return COLUMN_NAMES.length;
}
@Override
public int getRowCount() {
// TODO Auto-generated method stub
if (null == data)
return 0;
return data.size();
}
@Override
public Object getValueAt(int row, int col) {
// TODO Auto-generated method stub
System.out.println("Requesting Row :" + row + " and Column : " + col);
if (col == COL1_INDEX)
{
return row;
}else
{
return data.get(row);
}
}
@Override
public String getColumnName(int column) {
// TODO Auto-generated method stub
return COLUMN_NAMES[column];
}
}
}
任何帮助解决这个问题非常感谢。 提前致谢。
我已经想出了解决上述问题的方法。 我在框架中添加了一个组件侦听器，并且每当它的大小发生变化时，我都会遍历这些表并更改这些表的DataModel以仅显示可见的行。
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;
import java.util.ArrayList;
import java.util.List;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.ScrollPaneConstants;
import javax.swing.table.AbstractTableModel;
public class DataPanel extends JPanel{
/**
*
*/
private static final long serialVersionUID = 1L;
private static final int ROW_HEIGHT = 18;
List<String> data = new ArrayList<String>();
List<JTable> tables = new ArrayList<JTable>();
JScrollPane scrollPane;
JTable table, lastTable;
JPanel boxPanel;
JFrame f;
int rows = 0;
public DataPanel()
{
for (int i = 0; i < 50; i++)
data.add("Blah " + i);
DataModel tableData = new DataModel(data);
tableData.setData(data);
setLayout(new BorderLayout());
/*JButton btn = new JButton("Action");
btn.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
addTable();
}
});
add(btn, BorderLayout.NORTH);*/
boxPanel = new JPanel();
boxPanel.setLayout(new BoxLayout(boxPanel, BoxLayout.X_AXIS));
addTable();
add(boxPanel, BorderLayout.CENTER);
f = new JFrame();
f.getContentPane().add(this);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(500,500);
f.setVisible(true);
f.addComponentListener(adapter);
}
protected void addTable() {
// TODO Auto-generated method stub
while (rows < data.size())
{
System.out.println("Querying " + rows);
List<String> newData = getData(rows);
rows += getVisibleRowCount();
DataModel newModel = new DataModel(newData);
JTable newTable = new JTable(newModel);
lastTable = newTable;
newTable.setRowHeight(ROW_HEIGHT);
JScrollPane newScrollPane = new JScrollPane(newTable);
tables.add(newTable);
newScrollPane.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER);
boxPanel.add(newScrollPane);
System.out.println("Now " + rows);
}
}
private ComponentAdapter adapter = new ComponentAdapter()
{
@Override
public void componentResized(ComponentEvent arg0) {
// TODO Auto-generated method stub
//super.componentResized(arg0);
rows = 0;
for (JTable eachTable : tables)
{
List<String> newData = getData(rows);
rows += getVisibleRowCount();
DataModel newModel = new DataModel(newData);
eachTable.setModel(newModel);
((DataModel)eachTable.getModel()).fireTableDataChanged();
}
}
};
private List<String> getData(int rows) {
// TODO Auto-generated method stub
List<String> newData = new ArrayList<String>();
int j = 0;
for(int i=0; i<data.size() && j < getVisibleRowCount(); i++)
{
if (i >= rows)
{
newData.add(data.get(i));
j++;
}
}
return newData;
}
private int getVisibleRowCount()
{
Dimension extentSize = null;
int visibleRows = 12;
if (null != f)
{
extentSize = f.getSize();
visibleRows = (extentSize.height - 50)/ROW_HEIGHT;
}
return visibleRows;
}
public static void main(String args[])
{
new DataPanel();
}
private class DataModel extends AbstractTableModel{
static final int COL1_INDEX = 0;
static final int COL2_INDEX = 1;
private final String[] COLUMN_NAMES = new String[]
//LM2 - B & O abbreviations to be replaced by B & S. - HP 17e9355d63
//LM2 - brokers should be able to see trader names in the order panel - HP e4fbaa791a
{"ID", "Name"};
private List<String> data = new ArrayList<String>();
public DataModel(List<String> newData)
{
data = newData;
}
public List<String> getData() {
return data;
}
public void setData(List<String> data) {
this.data = data;
}
@Override
public int getColumnCount() {
// TODO Auto-generated method stub
return COLUMN_NAMES.length;
}
@Override
public int getRowCount() {
// TODO Auto-generated method stub
if (null == data)
return 0;
return data.size();
}
@Override
public Object getValueAt(int row, int col) {
// TODO Auto-generated method stub
if (col == COL1_INDEX)
{
return row;
}else
{
return data.get(row);
}
}
@Override
public String getColumnName(int column) {
// TODO Auto-generated method stub
return COLUMN_NAMES[column];
}
}
}
我不确定这是否是一种有效的方式，但是它可行，而这正是我现在需要的。 请让我知道是否有更好的方法来解决这个问题。
再次感谢。
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