TableCellRenderer以及如何在不使用JTable.repaint（）的情况下刷新单元格背景
-
可以正确地根据外部的值刷新背景，而不必强制重绘
table.repaint(); -
Based, used and tested with great code made by kleopatra and Hovercraft Full Of Eels
-
对Java6 / 7有效，因为API中没有任何更改
我的SSCCE工作正常，由JTable.repaint()
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class MyTableAndRenderer {
private JFrame frame = new JFrame();
private JPanel panel = new JPanel();
private String[] items = {"Item 1", "Item 2", "Item 3", "Item 4"};
private DefaultComboBoxModel comboBoxModel = new DefaultComboBoxModel(items);
private JComboBox combo = new JComboBox(comboBoxModel);
private JPanel panel1 = new JPanel();
private String[] columnNames = {"First Name", "Last Name", "Sport",
"# of Years", "Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith", "Item 1", new Integer(5), (false)},
{"John", "Doe", "Item 1", new Integer(3), (true)},
{"Sue", "Black", "Item 3", new Integer(2), (false)},
{"Jane", "White", "Item 3", new Integer(20), (true)},
{"Joe", "Brown", "Item 3", new Integer(10), (false)}
};
private DefaultTableModel model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
private JTable table = new JTable(model);
public MyTableAndRenderer() {
panel.setBorder(new EmptyBorder(10, 0, 2, 0));
panel.add(combo);
//@HFOE
/*table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
@Override
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected,
hasFocus, row, column);
String str = combo.getSelectedItem().toString();
if (value.toString().equalsIgnoreCase(str)) {
setBackground(Color.RED);
} else {
setBackground(null);
}
return this;
}
});*/
//@kleopatra
/*table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
@Override
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
String str = combo.getSelectedItem().toString();
if (value.toString().equalsIgnoreCase(str)) {
setBackground(Color.RED);
} else {
setBackground(null);
}
super.getTableCellRendererComponent(table, value, isSelected,
hasFocus, row, column);
return this;
}
});*/
table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
@Override
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
super.getTableCellRendererComponent(table, value, isSelected,
hasFocus, row, column);
String str = combo.getSelectedItem().toString();
if (value.toString().equalsIgnoreCase(str)) {
setBackground(Color.RED);
table.repaint();
} else {
setBackground(null);
table.repaint();
}
return this;
}
});
table.getTableHeader().setReorderingAllowed(false);
table.setAutoCreateRowSorter(true);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
panel1.setLayout(new GridLayout(1, 1, 10, 10));
panel1.add(new JScrollPane(table));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(panel, BorderLayout.NORTH);
frame.add(panel1);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
MyTableAndRenderer fs = new MyTableAndRenderer();
}
});
}
}
修改
@Devolus写道你测试了我发布的内容吗？我从我自己的工作代码中获取了这个片段，我只是删除了中间的内容，因为它与答案无关。我在这里使用Java 6，这对我有用。
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row, int column)
{
Component cell = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
... determine the color value ...
cell.setBackground(back);
cell.setForeground(fore);
}
- 引起
- 无关紧要Java6 / 7
来自代码（发布SSCCE的理由）
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class MyTableAndRenderer {
private JFrame frame = new JFrame();
private JPanel panel = new JPanel();
private String[] items = {"Item 1", "Item 2", "Item 3", "Item 4"};
private DefaultComboBoxModel comboBoxModel = new DefaultComboBoxModel(items);
private JComboBox combo = new JComboBox(comboBoxModel);
private JPanel panel1 = new JPanel();
private String[] columnNames = {"First Name", "Last Name", "Sport",
"# of Years", "Vegetarian"};
private Object[][] data = {
{"Kathy", "Smith", "Item 1", new Integer(5), (false)},
{"John", "Doe", "Item 1", new Integer(3), (true)},
{"Sue", "Black", "Item 3", new Integer(2), (false)},
{"Jane", "White", "Item 3", new Integer(20), (true)},
{"Joe", "Brown", "Item 3", new Integer(10), (false)}
};
private DefaultTableModel model = new DefaultTableModel(data, columnNames) {
private static final long serialVersionUID = 1L;
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
};
private JTable table = new JTable(model);
public MyTableAndRenderer() {
panel.setBorder(new EmptyBorder(10, 0, 2, 0));
panel.add(combo);
table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
@Override
public Component getTableCellRendererComponent(JTable table,
Object value, boolean isSelected, boolean hasFocus,
int row, int column) {
Component c = super.getTableCellRendererComponent(table, value, isSelected,
hasFocus, row, column);
String str = combo.getSelectedItem().toString();
if (value.toString().equalsIgnoreCase(str)) {
c.setBackground(Color.RED);
} else {
c.setBackground(null);
}
return this;
}
});
table.getTableHeader().setReorderingAllowed(false);
table.setAutoCreateRowSorter(true);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
panel1.setLayout(new GridLayout(1, 1, 10, 10));
panel1.add(new JScrollPane(table));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(panel, BorderLayout.NORTH);
frame.add(panel1);
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
MyTableAndRenderer fs = new MyTableAndRenderer();
}
});
}
}
EDIT2
-
来自WinXp的
- （对于所有Win OS都不要使用Nimbus，Renderer非常有趣，从未见过，很棒!!!这怎么可能）
EDIT3：
注意我尽可能简化代码，在我的问题之前进行测试，然后将渲染组件转换为JComponent / JLabel也不起作用（使用JLabel.repaint（）/ setOpaque（））
2 个答案:
答案 0 :(得分：8)
更改所选项目时会出现此问题。你的组合框和你的表之间有一些隐式的交互（组合框的选定项目会影响表的绘制方式）。
当comboboxpopup被隐藏时，它会自动触发悬停区域的重绘（RepaintManager将仅重新绘制悬停区域，而不是整个表格）。但与此同时，您已经改变了绘制表格单元格的方式（第一个单元格不再涂成红色，因为它们不再匹配选择）。然而，重新粉刷经理只强制重新绘制表格的一小部分区域，而不是完全覆盖红色单元格，因此您会看到那些视觉故障。
以下是我可以提出的两种解决方案：
- 将
ActionListener添加到组合框并调用table.repaint()（易于操作） - 更改您的表格模型，并为相关单元格调用
fireTableCellUpdated(row, column)。
第二个解决方案的SSCCE：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.List;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.border.EmptyBorder;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class MyTableAndRenderer {
private final class DefaultTableModelExtension extends DefaultTableModel {
private static final long serialVersionUID = 1L;
private String selected;
private DefaultTableModelExtension(Object[][] data, Object[] columnNames) {
super(data, columnNames);
}
@Override
public Class getColumnClass(int column) {
return getValueAt(0, column).getClass();
}
public String getSelected() {
return selected;
}
public void setSelected(String selected) {
if (this.selected == null && selected == null || this.selected != null && this.selected.equalsIgnoreCase(selected)) {
return;
}
class Cell {
public final int row;
public final int column;
public Cell(int row, int column) {
super();
this.row = row;
this.column = column;
}
}
List<Cell> updatedCells = new ArrayList<Cell>();
if (this.selected != null) {
for (int i = 0; i < data.length; i++) {
Object[] o = data[i];
for (int j = 0; j < o.length; j++) {
Object object = o[j];
if (this.selected.toString().equalsIgnoreCase(object.toString())) {
updatedCells.add(new Cell(i, j));
}
}
}
}
this.selected = selected;
if (this.selected != null) {
for (int i = 0; i < data.length; i++) {
Object[] o = data[i];
for (int j = 0; j < o.length; j++) {
Object object = o[j];
if (this.selected.toString().equalsIgnoreCase(object.toString())) {
updatedCells.add(new Cell(i, j));
}
}
}
}
for (Cell pair : updatedCells) {
fireTableCellUpdated(pair.row, pair.column);
}
}
}
private JFrame frame = new JFrame();
private JPanel panel = new JPanel();
private String[] items = { "Item 1", "Item 2", "Item 3", "Item 4" };
private DefaultComboBoxModel comboBoxModel = new DefaultComboBoxModel(items);
private JComboBox combo = new JComboBox(comboBoxModel);
private JPanel panel1 = new JPanel();
private String[] columnNames = { "First Name", "Last Name", "Sport", "# of Years", "Vegetarian" };
private Object[][] data = { { "Kathy", "Smith", "Item 1", new Integer(5), false }, { "John", "Doe", "Item 1", new Integer(3), true },
{ "Sue", "Black", "Item 3", new Integer(2), false }, { "Jane", "White", "Item 3", new Integer(20), true },
{ "Joe", "Brown", "Item 3", new Integer(10), false } };
private DefaultTableModelExtension model = new DefaultTableModelExtension(data, columnNames);
private JTable table = new JTable(model);
public MyTableAndRenderer() {
panel.setBorder(new EmptyBorder(10, 0, 2, 0));
panel.add(combo);
combo.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
updateSelected();
}
});
// Need first synch
updateSelected();
table.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
@Override
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row,
int column) {
Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
String str = combo.getSelectedItem().toString();
if (value.toString().equalsIgnoreCase(str)) {
c.setBackground(Color.RED);
} else {
c.setBackground(null);
}
return this;
}
});
table.getTableHeader().setReorderingAllowed(false);
table.setAutoCreateRowSorter(true);
table.setPreferredScrollableViewportSize(table.getPreferredSize());
panel1.setLayout(new GridLayout(1, 1, 10, 10));
panel1.add(new JScrollPane(table));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(panel, BorderLayout.NORTH);
frame.add(panel1);
frame.pack();
frame.setVisible(true);
}
private void updateSelected() {
model.setSelected((String) combo.getSelectedItem());
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
MyTableAndRenderer fs = new MyTableAndRenderer();
}
});
}
}
答案 1 :(得分：0)
要解决您的特定问题，您可以添加table.repaint（），如图所示。
但是，要正确地重绘表格，您应该从外部刷新它。在这个例子中，你应该在组合框上添加一个事件监听器，然后从那里刷新它。
public Component getTableCellRendererComponent(JTable table,
Object value,
boolean isSelected,
boolean hasFocus,
int row, int column)
{
Component cell = super.getTableCellRendererComponent(table, value, isSelected,
hasFocus, row, column);
String str = combo.getSelectedItem().toString();
if (value.toString().equalsIgnoreCase(str))
{
cell.setBackground(Color.RED);
}
else
{
cell.setBackground(null);
}
return cell;
}
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