自定义Java JTable多层表头绘制-优快云博客

本文链接：https://blog.youkuaiyun.com/luoqiaozhen/article/details/7973880

这篇博客介绍了如何使用Java Swing组件扩展BasicTableHeaderUI，实现自定义的多层表头绘制。通过MappingTableHeaderUI类，结合JXTable和MappingTableModel，能够根据数据模型动态绘制表头，包括单层列名和多组分层列名，并且能够精确控制各列的宽度和位置。

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import java.awt.Dimension;
import java.awt.Graphics;

import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicTableHeaderUI;
import javax.swing.table.JTableHeader;

import org.jdesktop.swingx.JXTable;

public class MappingTableHeaderUI extends BasicTableHeaderUI {

private JTableHeader header;
private MappingTableModel tableModel;
private JXTable mappingTable;
   public MappingTableHeaderUI(JXTable table){
    this.tableModel =(MappingTableModel) table.getModel();
    mappingTable = table;
    mappingTable.getTableHeader().setPreferredSize(new Dimension(10000, 30));

}

public void paint(Graphics g, JComponent c) {

   header = (JTableHeader) c;
   JLabel label=getLabel("");
   for (int i = 0; i< tableModel.getSingleColumnCount(); i++){
    String columnName = tableModel.getColumnName(i);
    label = getLabel(columnName);
    rendererPane.paintComponent(g, label, header, getX(i), 0, getWidth(i), 30, true);
   }
   for(int j = 0 ;j < tableModel.getGroupColumnCounts(); j++){
    String groupcolumnName = tableModel.getGroupColumnName(j);
    label = getLabel(groupcolumnName);
    int groupwidth = 0;
    for(int k = 0 ;k < tableModel.getGroupColumnSubCounts(j) ; k++){
     int index = tableModel.changeToTotalColumnIndex(j,k);
     String columnName = tableModel.getColumnName(index);
     label = getLabel(columnName);
     rendererPane.paintComponent(g, label, header, getX(index), 15, getWidth(index), 15, true);
     groupwidth +=getWidth(index);
    }
    int groupindex = tableModel.changeToTotalColumnIndex(j,0);
    rendererPane.paintComponent(g, label, header, getX(groupindex), 0, groupwidth, 15, true);
   }

}

private int getX(int column){

int x=0;

     for(int i=0;i<column;i++){
//     if(i < tableModel.getSingleColumnCount()){
//       x+=tableModel.getSingleColumnWidth(i);
//     }else{
       x+=header.getColumnModel().getColumn(i).getWidth();
//     }
     }

return x;

   }

private int getWidth(int column){
//   if(column < tableModel.getSingleColumnCount()){
//    return tableModel.getSingleColumnWidth(column);
//   }

return header.getColumnModel().getColumn(column).getWidth();

}

private JLabel getLabel(String text){

JLabel label = new JLabel(text, JLabel.CENTER);

label.setBorder(UIManager.getBorder("TableHeader.cellBorder"));

return label;

}