如何给一个jtable单元格不同的背景颜色 [英] how to give a jtable cell different background colour
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问题描述
类CustomTableCellRenderer扩展了DefaultTableCellRenderer {
private地图<整数，颜色> mapColors;
public CustomTableCellRenderer（）{
mapColors = new HashMap<>（）;
public void setRowColor（int row，Color color）{
// System.out.println（row +... happy ....+ color ）;
mapColors.put（row，color）;
$ b @Override
public Component getTableCellRendererComponent（JTable table，Object obj，boolean isSelected，boolean hasFocus，int row，int column）{
组件单元= super.getTableCellRendererComponent（table，obj，isSelected，hasFocus，row，1）;
Color color = mapColors.get（row）;
if（color！= null）{
cell.setBackground（color）;
} else {
cell.setBackground（isSelected？table.getSelectionBackground（）：table.getBackground（））;
}
row ++;
返回单元格;
}
}
解决方案
A单元格渲染器是应用于给定列的所有单元格的共享资源。为了为给定的行或行提供定制，您需要提供一种方法，让您可以记住您想要的行和它的颜色，例如...
public class CustomTableCellRenderer extends DefaultTableCellRenderer {
private Map< Integer，Color> mapColors;
$ b $ public CustomTableCellRenderer（）{
mapColors = new HashMap< Integer，Color>（）;
public void setRowColor（int row，Color color）{
mapColors.put（row，color）;
$ b @Override
public Component getTableCellRendererComponent（JTable table，Object obj，boolean isSelected，boolean hasFocus，int row，int column）{
组件单元= super.getTableCellRendererComponent（table，obj，isSelected，hasFocus，row，1）;
Color color = mapColors.get（row）;
if（color！= null）{
cell.setBackground（color）;
} else {
cell.setBackground（isSelected？table.getSelectionBackground（）：table.getBackground（））;
}
return cell;
例如...
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Test {
public static void main（String [] args）{
new Test（）;
$ b $ public Test（）{
EventQueue.invokeLater（new Runnable（）{
@Override
public void run（）{
尝试{
UIManager.setLookAndFeel（UIManager.getSystemLookAndFeelClassName（））;
} catch（ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex）{
ex.printStackTrace（）;
}
DefaultTableModel model = new DefaultTableModel（new Object [] {One}，6）;
CustomTableCellRenderer renderer = new CustomTableCellRenderer（）;
renderer.setRowColor（0，Color .RED）;
renderer.setRowColor（1，Color.GREEN）;
renderer.setRowColor（2，Color.BLUE）;
renderer.setRowColor（3，Color.PINK）;
renderer.setRowColor（4，Color.MAGENTA）;
JTable table = new JTable（model）;
table.getColumnModel（）。getColumn（0）.setCellRenderer（renderer）;
JFrame frame = new JFrame（Testing）;
frame.setDefaultCloseOperation（JFrame.EXIT_ON_CLOSE）;
frame.add（new JScrollPane（table））;
frame.pack（）;
frame.setLocationRelativeTo（null）;
frame.setVisible（true）;
}
}）;
}
类CustomTableCellRenderer扩展了DefaultTableCellRenderer {
私有地图<整数，颜色> mapColors;
$ b $ public CustomTableCellRenderer（）{
mapColors = new HashMap< Integer，Color>（）;
public void setRowColor（int row，Color color）{
mapColors.put（row，color）;
$ b @Override
public Component getTableCellRendererComponent（JTable table，Object obj，boolean isSelected，boolean hasFocus，int row，int column）{
组件单元= super.getTableCellRendererComponent（table，obj，isSelected，hasFocus，row，1）;
Color color = mapColors.get（row）;
if（color！= null）{
cell.setBackground（color）;
} else {
cell.setBackground（isSelected？table.getSelectionBackground（）：table.getBackground（））;
}
return cell;
请参阅概念：编辑器和渲染器了解更多详情
i am getting only last row coloured..
class CustomTableCellRenderer extends DefaultTableCellRenderer {
private Map<Integer, Color> mapColors;
public CustomTableCellRenderer() {
mapColors = new HashMap<>();
}
public void setRowColor(int row, Color color) {
// System.out.println(row + "...happy...." + color);
mapColors.put(row, color);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus, int row, int column) {
Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, 1);
Color color = mapColors.get(row);
if (color != null) {
cell.setBackground(color);
} else {
cell.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
}
row++;
return cell;
}
}
解决方案
A cell renderer is a shared resource which is applied to ALL the cells for a given column. In order to provide customisation for a given row or rows, you need to provide a means by which you can remember which row you want and it's color, for example...
public class CustomTableCellRenderer extends DefaultTableCellRenderer {
private Map<Integer, Color> mapColors;
public CustomTableCellRenderer() {
mapColors = new HashMap<Integer, Color>();
}
public void setRowColor(int row, Color color) {
mapColors.put(row, color);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus, int row, int column) {
Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, 1);
Color color = mapColors.get(row);
if (color != null) {
cell.setBackground(color);
} else {
cell.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
}
return cell;
}
}
For example...
import java.awt.Color;
import java.awt.Component;
import java.awt.EventQueue;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
DefaultTableModel model = new DefaultTableModel(new Object[]{"One"}, 6);
CustomTableCellRenderer renderer = new CustomTableCellRenderer();
renderer.setRowColor(0, Color.RED);
renderer.setRowColor(1, Color.GREEN);
renderer.setRowColor(2, Color.BLUE);
renderer.setRowColor(3, Color.PINK);
renderer.setRowColor(4, Color.MAGENTA);
JTable table = new JTable(model);
table.getColumnModel().getColumn(0).setCellRenderer(renderer);
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
class CustomTableCellRenderer extends DefaultTableCellRenderer {
private Map<Integer, Color> mapColors;
public CustomTableCellRenderer() {
mapColors = new HashMap<Integer, Color>();
}
public void setRowColor(int row, Color color) {
mapColors.put(row, color);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object obj, boolean isSelected, boolean hasFocus, int row, int column) {
Component cell = super.getTableCellRendererComponent(table, obj, isSelected, hasFocus, row, 1);
Color color = mapColors.get(row);
if (color != null) {
cell.setBackground(color);
} else {
cell.setBackground(isSelected ? table.getSelectionBackground() : table.getBackground());
}
return cell;
}
}
}
See Concepts: Editors and Renderers for more details
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