JTable整行拖动 - ITeye问答

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JTable整行拖动 3

1. 当我选中JTabel的某一行时，拖动这个行的时候，整行数据都一起拖动，随便都可以拖到某一行中间。
2. 还有就是，几行一起拖动，当我给定一范围，假定是3行，以选中某一行为起始点，一行为结束点，这几行能整个拖动。。。
怎么实现呢？

Swing

2009年6月23日 22:43

zy_pub
3
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4个答案按时间排序按投票排序

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这是一个行拖拽的实例，非常好，你看看

package com.test;

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;

public class TableFrame extends JFrame {
	public TableFrame(){
		setLayout(new BorderLayout());
		DefaultTableModel dm = new DefaultTableModel(new String[]{"index","content"}, 0){

			@Override
			public Object getValueAt(int row, int column) {
				if(column==0){
					return row;
				}
				return super.getValueAt(row, column);
			}
			
		};
		final JTable table=new JTable(dm);
		table.setUI(new DragDropRowTableUI());
		for(int i=0;i<10;i++){
			dm.addRow(new Object[]{i,i+"string"});
		}
		add(new JScrollPane(table),BorderLayout.CENTER);
		JButton btn=new JButton("hello");
		btn.addActionListener(new ActionListener() {
			
			
			public void actionPerformed(ActionEvent e) {
				System.out.println(table.getSelectedRow());;
				System.out.println(table.getValueAt(4, 1));
			}
		});
		add(btn,BorderLayout.SOUTH);
		this.setSize(600,400);
		setVisible(true);
	}
	public static void main(String[] args) {
		new TableFrame();
	}
}

package com.test;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import javax.swing.JComponent;
import javax.swing.event.MouseInputListener;
import javax.swing.plaf.basic.BasicTableUI;
import javax.swing.table.TableModel;
public class DragDropRowTableUI extends BasicTableUI {
 
 private boolean draggingRow = false;
 private int startDragPoint;
 private int dyOffset;
 
    protected MouseInputListener createMouseInputListener() {
        return new DragDropRowMouseInputHandler();
    }
    
    public void paint(Graphics g, JComponent c) {
     super.paint(g, c);
     
     if (draggingRow) {
      g.setColor(table.getParent().getBackground());
   Rectangle cellRect = table.getCellRect(table.getSelectedRow(), 0, false);
      g.copyArea(cellRect.x, cellRect.y, table.getWidth(), table.getRowHeight(), cellRect.x, dyOffset);
      
      if (dyOffset < 0) {
       g.fillRect(cellRect.x, cellRect.y + (table.getRowHeight() + dyOffset), table.getWidth(), (dyOffset * -1));
      } else {
       g.fillRect(cellRect.x, cellRect.y, table.getWidth(), dyOffset);
      }
     }
    }
    
    class DragDropRowMouseInputHandler extends MouseInputHandler {
     
        public void mousePressed(MouseEvent e) {
         super.mousePressed(e);
         startDragPoint = (int)e.getPoint().getY();    
        }
        
        public void mouseDragged(MouseEvent e) {  
         int fromRow = table.getSelectedRow();
         
         if (fromRow >= 0) {
          draggingRow = true;
          int rowHeight = table.getRowHeight();
          int middleOfSelectedRow = (rowHeight * fromRow) + (rowHeight / 2);  
          int toRow = -1;
          int yMousePoint = (int)e.getPoint().getY();
                   
          if (yMousePoint < (middleOfSelectedRow - rowHeight)) {
           // Move row up
           toRow = fromRow - 1;
          } else if (yMousePoint > (middleOfSelectedRow + rowHeight)) {
           // Move row down
           toRow = fromRow + 1;
          }
          
          if (toRow >= 0 && toRow < table.getRowCount()) {
           TableModel model = table.getModel();
           
        for (int i = 0; i < model.getColumnCount(); i++) {
         Object fromValue = model.getValueAt(fromRow, i);
         Object toValue = model.getValueAt(toRow, i);
         
         model.setValueAt(toValue, fromRow, i);
         model.setValueAt(fromValue, toRow, i);
        }
        table.setRowSelectionInterval(toRow, toRow);
        startDragPoint = yMousePoint;
          }
          dyOffset = (startDragPoint - yMousePoint) * -1;
                        System.out.println("dyOffset:" + dyOffset);
          table.repaint();
         }
        }
        
        public void mouseReleased(MouseEvent e){
         super.mouseReleased(e);
         draggingRow = false;
         table.repaint();
        }
    }
}

2014年7月04日 11:54

zyp307
30
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朋友，问题要自动关闭啦，结分哦

2009年7月08日 18:53

lovewhzlq
13934
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怎么都没有人来回答下叻== @@"
我想是可以通过鼠标事件来实现的，MousePressed()选中行数，MouseDrag()拖动行（在这里具体写，一时半会儿也迷惑着。。。），MouseReless() :确定行落下的位置是移动在哪一行插入，后面两个事件里面的逻辑怎么处理，需要各位大虾们指点一下哈。。谢谢！

2009年7月03日 10:09