问题描述
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我正在使用以下代码，该代码在AbstractTableModel内部包含一个JProgressBar。通过返回Float，在getValueAt（）函数的“情况5：\”中更新JProgressBar进度值。我试图弄清楚的是如何访问底层的JProgressBar实例，以便我可以修改其某些属性而不是进度值（例如setVisible（））。
package org.jdamico.jhu.runtime;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
// This class manages the upload table\'s data.
class TransfersTableModel extends AbstractTableModel implements Observer {
/**
*
*/
private static final long serialVersionUID = 2740117506937325535L;
// These are the names for the table\'s columns.
private static final String[] columnNames = { \"Type\",\"Name\",\"UUID\",\"Status\",\"Stage\",\"Progress\",\"Total Start Time\",\"Total End Time\" };
// These are the classes for each column\'s values.
private static final Class[] columnClasses = { String.class,String.class,JProgressBar.class,String.class};
// The table\'s list of uploads.
private ArrayList<ParentEntry> transferList = new ArrayList<ParentEntry>();
// Add a new upload to the table.
public void addTransfer(ParentEntry pe) {
// Register to be notified when the upload changes.
pe.addobserver(this);
transferList.add(pe);
// Fire table row insertion notification to table.
fireTableRowsInserted(getRowCount(),getRowCount());
}
// Get a upload for the specified row.
public ParentEntry getTransfer(int row) {
return transferList.get(row);
}
// Remove a upload from the list.
public void clearTransfer(int row) {
transferList.remove(row);
// Fire table row deletion notification to table.
fireTableRowsDeleted(row,row);
}
// Get table\'s column count.
public int getColumnCount() {
return columnNames.length;
}
// Get a column\'s name.
public String getColumnName(int col) {
return columnNames[col];
}
// Get a column\'s class.
public Class getColumnClass(int col) {
return columnClasses[col];
}
// Get table\'s row count.
public int getRowCount() {
return transferList.size();
}
// Get value for a specific row and column combination.
public Object getValueAt(int row,int col) {
ParentEntry pe = transferList.get(row);
switch (col) {
case 0:
return pe.getType();
case 1: // URL
return pe.getUrl();
case 2: //UUID
return pe.getUUID() + \"\";
case 3: // Status
return pe.getStatus().getdisplay();
case 4: // Stage
return pe.getStage().getdisplay();
case 5: //Progress
return new Float(pe.getProgress());
case 6:
if (pe.getTotalStartTime() != null)
return pe.getTotalStartTime().getTime().toString();
else
return \"\";
case 7:
if (pe.getTotalEndTime() != null)
return pe.getTotalEndTime().getTime().toString();
else
return \"\";
}
return \"\";
}
/*
* Update is called when a Upload notifies its observers of any changes
*/
public void update(Observable o,Object arg) {
int index = transferList.indexOf(o);
// Fire table row update notification to table.
fireTableRowsUpdated(index,index);
}
}
package org.jdamico.jhu.runtime;
import java.awt.*;
import javax.swing.*;
import javax.swing.table.*;
/*import org.jdamico.jhu.components.Controller;
import org.jdamico.jhu.components.FilePartition;
import org.vikulin.utils.Constants;*/
// This class renders a JProgressBar in a table cell.
class ProgressRenderer extends JProgressBar implements TableCellRenderer {
// Constructor for ProgressRenderer.
public ProgressRenderer(int min,int max) {
super(min,max);
}
/*
* Returns this JProgressBar as the renderer for the given table cell.
*/
public Component getTableCellRendererComponent(JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column) {
// Set JProgressBar\'s percent complete value.
Float tmp = ((Float) value).floatValue();
if (tmp == -1) {
this.setVisible(false);
}
else {
setValue((int) ((Float) value).floatValue());
if (this.isVisible() == false)
this.setVisible(true);
}
return this;
}
}
解决方法
您可以在类中添加一个方法，该方法允许您获取与感兴趣的行关联的JProgressBar，例如：
public JProgressBar getProgressBar(int row) {
ParentEntry pe = transferList.get(row);
return pe.getProgress();
}
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
import javax.swing.*;
import javax.swing.table.TableCellRenderer;
public class ProgressBarTableCellRendererExample {
private Random random = new Random();
private JTable table;
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new ProgressBarTableCellRendererExample().makeUI();
}
});
}
public void makeUI() {
table = new JTable(11,1) {
private Object[][] data;
private static final long serialVersionUID = 1L;
@Override
public boolean isCellEditable(int row,int column) {
return false;
}
@Override
public Class<?> getColumnClass(int column) {
return Integer.class;
}
};
randomize();
table.setDefaultRenderer(Integer.class,new ProgressBarTableCellRenderer());
table.setRowHeight(20);
table.setRowMargin(2);
JButton button = new JButton(\"Randomize\");
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
randomize();
getTableValue();
}
});
JFrame frame = new JFrame();
frame.add(new JScrollPane(table),BorderLayout.CENTER);
frame.add(button,BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocation(150,150);
frame.setPreferredSize(new Dimension(600,300));
frame.pack();
frame.setVisible(true);
}
private void randomize() {
for (int i = 0; i < table.getRowCount(); i++) {
table.setValueAt(random.nextInt(100),i,0);
}
}
private void getTableValue() {
for (int i = 0; i < table.getRowCount(); i++) {
System.out.println(String.valueOf(table.getValueAt(i,0)));
}
}
private class ProgressBarTableCellRenderer extends JProgressBar implements TableCellRenderer {
private static final long serialVersionUID = 1L;
@Override
public Component getTableCellRendererComponent(JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column) {
setValue((Integer) value);
System.out.println(\"Tables Row: \" + row + \",Column : \" + column + \",has value - \" + value);
return this;
}
}
}