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java - TableCellRenderer 以及如何在不使用 JTable.repaint() 的情况下刷新单元格背景

转载 作者:搜寻专家 更新时间:2023-10-30 21:10:15 25 4
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enter image description here enter image description here enter image description here

我的 SSCCE 工作正常,由 JTable.repaint() 重绘

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();
}
});
}
}

编辑

@Devolus 写道,你测试过我发布的内容了吗?我从我自己的工作代码中提取了这个片段,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);
}
  • 导致

enter image description here

  • Java6/7 没关系

来自代码(发布 SSCCE 的原因)

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();
}
});
}
}

编辑2

  • 来自 WinXp(所有 Win OS 都不使用 Nimbus,Renderer 非常有趣,从未见过,太棒了!!!这怎么可能)

enter image description here

编辑3:

请注意,我尽可能地简化了代码,在我提出问题之前进行了测试,然后将渲染组件转换到 JComponent/JLabel 也不起作用(使用 JLabel.repaint()/setOpaque())

最佳答案

当您更改所选项目时会出现此问题。您的组合框和表格之间存在一些隐式交互(组合框的选定项目会影响表格的绘制方式)。

当 comboboxpopup 被隐藏时,它会自动触发悬停区域的重绘(RepaintManager 只会重绘悬停区域,而不是整个表格)。但与此同时,您更改了表格单元格的绘制方式(第一个单元格不再绘制为红色,因为它们不再与选择匹配)。然而,重绘管理器只强制重绘表格的一小块区域,该区域没有完全覆盖红色单元格,因此您会看到这些视觉故障。

这里有 2 个我可以想出的解决方案:

  • 向组合框添加一个 ActionListener 并调用 table.repaint()(很容易做到)
  • 更改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();
}
});
}
}

关于java - TableCellRenderer 以及如何在不使用 JTable.repaint() 的情况下刷新单元格背景,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16814512/

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