JTable中实现拖拽式多选、删除功能

从IBM notes邮箱中得到的灵感，在收件箱的最左侧可以使用鼠标拖拽选择多封邮件，或者是拖拽取消多封邮件的选择，以及Ctrl-A全选所有邮件的功能，觉得很是方便，省去了在界面中添加全选按钮导致界面难看、不易布局的问题

	
public class MyDialog extends JDialog implements ListSelectionListener{
	
	private boolean mousePressed ;
	private boolean anchorSelected ;
	private boolean ctrlA ;
		
	public MyDialog(){
		myTable.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
		myTable.addKeyListener(new KeyAdapter(){
			@Override
			public void keyPressed(KeyEvent e) {
				if(e.getModifiersEx() == KeyEvent.CTRL_DOWN_MASK && e.getKeyCode() == KeyEvent.VK_A){
					ctrlA = true;
					logger.debug("Ctrl-A pressed");
				}
			}
			
		});
		myTable.addMouseListener(new MouseAdapter(){
			@Override
			public void mouseClicked(MouseEvent e) {
				int rowIndex = myTable.rowAtPoint(e.getPoint());
				if (rowIndex == -1) {
					return ;
				}
				logger.debug("MouseClicked:" + rowIndex);
				if (e.getButton()==MouseEvent.BUTTON3) {
					myTable.getSelectionModel().clearSelection();
					return;
				}
				mousePressed = false;
				tableModel.updateObject(tableModel.getRow(rowIndex).setSelected(!anchorSelected));
			}
			@Override
			public void mouseReleased(MouseEvent e) {
				int rowIndex = myTable.rowAtPoint(e.getPoint());
				if (rowIndex == -1) {
					return ;
				}
				mousePressed = false;
				logger.debug("MouseReleased:" + rowIndex);
			}
			public void mousePressed(MouseEvent e) {
				int rowIndex = myTable.rowAtPoint(e.getPoint());
				if (rowIndex == -1) {
					return ;
				}
				mousePressed = true;
				logger.debug("MousePressed:" + rowIndex);
			}
		});
		myTable.getSelectionModel().addListSelectionListener(this);
	}
	
	public void valueChanged(ListSelectionEvent e) {
		ListSelectionModel lsm = (ListSelectionModel)e.getSource();
		int anchorSelectionIndex = lsm.getAnchorSelectionIndex();
		int leadSelectionIndex = lsm.getLeadSelectionIndex() ;
		if(anchorSelectionIndex == leadSelectionIndex  &&  mousePressed){
			return;
		}
		logger.debug("ListSelection: getFirstIndex " + e.getFirstIndex() + "|getLastIndex " + e.getLastIndex());
		logger.debug("ListSelection: getAnchorSelectionIndex " + anchorSelectionIndex);
		logger.debug("ListSelection: getLeadSelectionIndex " + leadSelectionIndex);
		//取出拖选的第一行，并保存其选择状态
		anchorSelected = tableModel.getRow(anchorSelectionIndex).isSelected();
		if(ctrlA){
			//如果是全选，则将所有行全部设为选中状态
			logger.debug("ListSelection: Ctrl-A");
			for(int row = 0 ; row < boxTable.getRowCount() ; row ++){
				tableModel.updateObject(tableModel.getRow(row).setSelected(true));
			}
			ctrlA = false;
			return;
		}
		//如果不是全选，则修改所有选择行的状态，该状态与拖选的第一行的初始状态相反
		for(int row :boxTable.getSelectedRows()){
			if(anchorSelectionIndex == leadSelectionIndex){
				tableModel.updateObject(tableModel.getRow(row).setSelected(!anchorSelected));
			}else{
				tableModel.updateObject(tableModel.getRow(row).setSelected(anchorSelected));
			}
		}
	}
}

下面是改进版本，主要是使用逐个更新替换全部更新，并且在右键中取消并重新加入ListSelectionListener

	
public class MyDialog extends JDialog implements ListSelectionListener{
	
	private boolean mousePressed ;
	private boolean anchorSelected ;
	private boolean ctrlA ;
		
	public MyDialog(){
		myTable.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
		myTable.addKeyListener(new KeyAdapter(){
			@Override
			public void keyPressed(KeyEvent e) {
				if(e.getModifiersEx() == KeyEvent.CTRL_DOWN_MASK && e.getKeyCode() == KeyEvent.VK_A){
					ctrlA = true;
					logger.debug("Ctrl-A pressed");
				}
			}
			
		});
		myTable.addMouseListener(new MouseAdapter(){
			@Override
			public void mouseClicked(MouseEvent e) {
				int rowIndex = myTable.rowAtPoint(e.getPoint());
				if (rowIndex == -1) {
					return ;
				}
				logger.debug("MouseClicked:" + rowIndex);
				if (e.getButton()==MouseEvent.BUTTON3) {
					myTable.getSelectionModel().removeListSelectionListener(MyDialog.this);
					myTable.getSelectionModel().clearSelection();
					myTable.getSelectionModel().addListSelectionListener(MyDialog.this);
					return;
				}
				mousePressed = false;
				tableModel.updateObject(tableModel.getRow(rowIndex).setSelected(!anchorSelected));
			}
			@Override
			public void mouseReleased(MouseEvent e) {
				int rowIndex = myTable.rowAtPoint(e.getPoint());
				if (rowIndex == -1) {
					return ;
				}
				mousePressed = false;
				logger.debug("MouseReleased:" + rowIndex);
			}
			public void mousePressed(MouseEvent e) {
				int rowIndex = myTable.rowAtPoint(e.getPoint());
				if (rowIndex == -1) {
					return ;
				}
				mousePressed = true;
				logger.debug("MousePressed:" + rowIndex);
			}
		});
		myTable.getSelectionModel().addListSelectionListener(this);
	}
	
	public void valueChanged(ListSelectionEvent e) {
		ListSelectionModel lsm = (ListSelectionModel)e.getSource();
		int anchorSelectionIndex = lsm.getAnchorSelectionIndex();
		int leadSelectionIndex = lsm.getLeadSelectionIndex() ;
		if(anchorSelectionIndex == leadSelectionIndex  &&  mousePressed){
			return;
		}
		logger.debug("ListSelection: getFirstIndex " + e.getFirstIndex() + "|getLastIndex " + e.getLastIndex());
		logger.debug("ListSelection: getAnchorSelectionIndex " + anchorSelectionIndex);
		logger.debug("ListSelection: getLeadSelectionIndex " + leadSelectionIndex);
		//取出拖选的第一行，并保存其选择状态
		anchorSelected = tableModel.getRow(anchorSelectionIndex).isSelected();
		if(ctrlA){
			//如果是全选，则将所有行全部设为选中状态
			logger.debug("ListSelection: Ctrl-A");
			for(int row = 0 ; row < boxTable.getRowCount() ; row ++){
				tableModel.updateObject(tableModel.getRow(row).setSelected(true));
			}
			ctrlA = false;
			return;
		}
		//如果不是全选，则修改所有选择行的状态，该状态与拖选的第一行的初始状态相反
		if (anchorSelectionIndex == leadSelectionIndex) {
			tableModel.updateObject(tableModel.getRow(leadSelectionIndex).setSelected(!anchorSelected));
		} else {
			tableModel.updateObject(tableModel.getRow(leadSelectionIndex).setSelected(anchorSelected));
		}		
	}
}