这是一个难以解释的问题,我会尝试并逐步解释它,并排运行代码将有所帮助,但查看图像应该足以理解我的问题。行,模型行和视图行的有趣行为 - 哪一个使用时?
row和rowModel分别与数据显示和数据模型一致,但我根本无法理解rowView。什么时候rowView会有用?
1)默认视图:列B(1,2,3,4)。
2)按此排序列B报头:升序(1,2,3,4)。始终dataRow = modelRow = viewRow。
3)单击以对列B标题进行排序:按降序排列(4,3,2,1)。
行0 = rowModel 3 = rowView 3
行1 = rowModel 2 = rowView 2
行2 = rowModel 1 = rowView 1
行3 = rowModel 0 = rowView 0
所有预期!
4)现在点击列C进行排序:排序升序(下图)
列0:值 “4” - 行0 = rowModel 3 = rowView 2 ---为什么rowView是2?
第1列:值“1” - 行0 = rowModel 3 = rowView 2 --- 为什么rowView是2并且在剩余单元格中的行为如下?
列0:值“3” - 行1 = rowModel 2 = rowView 3 ---为什么rowView是3?
列1:值“3” - 行1 = rowModel 2 = rowView 3 ---为什么rowView是3?
列0:值“1” - 行2 = rowModel 0 = rowView 1 ---为什么rowView是1?
列1:值“4” - 行2 = rowModel 0 = rowView 1 ---为什么rowView是1?
列0:值“2” - 行3 = rowModel 1 = rowView 0 ---为什么rowView是0?
列1:值“5” - 行3 = rowModel 1 = rowView 0 ---为什么rowView是0?
代码:
import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableModel;
import java.awt.*;
public class SortTableWithColors_ extends JFrame {
public static void main(String[] args) {
SortTableWithColors_ frame = new SortTableWithColors_();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
public SortTableWithColors_() {
Object[] columnNames = {"B", "C"};
Object[][] data = {{new Integer(1), new Integer(4)},
{new Integer(2), new Integer(5)},
{new Integer(3), new Integer(3)},
{new Integer(4), new Integer(1)}};
// table model
DefaultTableModel model = new DefaultTableModel(data, columnNames);
// set table model in Jtable
JTable table = new JTable(model);
table.setAutoCreateRowSorter(true);
getContentPane().add(new JScrollPane(table));
// Tell the table what to use to render our columns
for (int i = 0; i < 2; i++) {
table.getColumnModel().getColumn(i).setCellRenderer(new NewRenderer());
}
}
// Custom Renderer
public class NewRenderer extends DefaultTableCellRenderer {
@Override
public Component getTableCellRendererComponent
(JTable table, Object value, boolean isSelected,
boolean hasFocus, int row, int column) {
JLabel cell = (JLabel) super.getTableCellRendererComponent
(table, value, isSelected, hasFocus, row, column);
int rowModel = (int) table.convertRowIndexToModel(row);
int colModel = (int) table.convertColumnIndexToModel(column);
int rowView = (int) table.convertRowIndexToView(row);
int colView = (int) table.convertColumnIndexToView(column);
// set color
cell.setBackground(new Color(0xFFFFFF));
cell.setForeground(new Color(0x000000));
//set selection colors
if (isSelected) {
cell.setBackground(new Color(0x4AC3FF));
cell.setForeground(new Color(0x000000)); // AM
}
// Selective cell colouring based on value
int val = (int) value;
if (val == 1) {
cell.setBackground(Color.GREEN);
}
return cell;
}
}
}
感谢您的优秀解释。我更喜欢通过Jtable使用数据,因为在排序和过滤操作期间,行索引是最不需要担心的,特别是在定义单元格渲染器时。 – Amit