tof21

Java Swing写的支持合并单元格的JTable

年前在网上参加了一个JavaSwing的招聘上机考试。招聘方要求开发一个类似EXCEL支持单元格合并的JTable。差不多用了5天的时间提交代码，最后被告知测试通过，我提出是否可做兼职，对方回复需要到上海做全职开发，最后也就放弃了。最近公司的一个项目中需要用到以前的代码，偶又重构了一次，设计思想来源于ListSelectionModel。

GridBagModel：抽象模型接口。该接口用于描述表格中单元格的合并状态。
DefaultGridBagTableModel：GridBagModel的默认实现。
GridBagTable：继承自JTable的控制器。通过该类中的方法控制表格单元的合并和拆分。
GridBagTableUI：GridBagTable对应的UI。

TODO：(已合并)行、列的插入，删除操作对应的GridBagModel的修改，不过已留接口。

Java代码

package org.dxj.guitools.gridbagtable;
import java.awt.Component;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.Enumeration;
import java.util.EventObject;
import javax.swing.DefaultCellEditor;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelEvent;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
/**
* @author [email protected]
*/
public class GridBagTable extends JTable{
GridBagModel gridBagModel;
public GridBagModel getGridBagModel() {
return gridBagModel;
}
public void setGridBagModel(GridBagModel gridBagModel){
if( gridBagModel != null && gridBagModel != this.gridBagModel )
this.gridBagModel = gridBagModel;
}
public GridBagTable(AbstractTableModel dm){
super(dm);
getTableHeader().setReorderingAllowed(false);
gridBagModel = new DefaultGridBagTableModel(dm);
getColumnModel().setColumnSelectionAllowed(true);
}
private void updateSubComponentUI(Object componentShell) {
if (componentShell == null) {
return;
}
Component component = null;
if (componentShell instanceof Component) {
component = (Component)componentShell;
}
if (componentShell instanceof DefaultCellEditor) {
component = ((DefaultCellEditor)componentShell).getComponent();
}
if (component != null) {
SwingUtilities.updateComponentTreeUI(component);
}
}
public void updateUI() {
// Update the UIs of the cell renderers, cell editors and header renderers.
TableColumnModel cm = getColumnModel();
for(int column = 0; column < cm.getColumnCount(); column++) {
TableColumn aColumn = cm.getColumn(column);
updateSubComponentUI(aColumn.getCellRenderer());
updateSubComponentUI(aColumn.getCellEditor());
updateSubComponentUI(aColumn.getHeaderRenderer());
}
// Update the UIs of all the default renderers.
Enumeration defaultRenderers = defaultRenderersByColumnClass.elements();
while (defaultRenderers.hasMoreElements()) {
updateSubComponentUI(defaultRenderers.nextElement());
}
// Update the UIs of all the default editors.
Enumeration defaultEditors = defaultEditorsByColumnClass.elements();
while (defaultEditors.hasMoreElements()) {
updateSubComponentUI(defaultEditors.nextElement());
}
// Update the UI of the table header
if (tableHeader != null && tableHeader.getParent() == null) {
tableHeader.updateUI();
}
setUI(new GridBagTableUI());
}
public Rectangle getGridCellRect(int row, int column, boolean includeSpacing){
return super.getCellRect(row, column, includeSpacing);
}
public Rectangle getCellRect(int row, int column, boolean includeSpacing) {
Rectangle cellRect = super.getCellRect(row, column, includeSpacing);
int cols = gridBagModel.getColumnGrid(row, column);
TableColumnModel cm = getColumnModel();
for( int n=1; n
cellRect.width += cm.getColumn(column+n).getWidth();
int rows = gridBagModel.getRowGrid(row, column);
for( int n=1; n
cellRect.height += getRowHeight(row+n);
return cellRect;
}
public void tableChanged(TableModelEvent e){
super.tableChanged(e);
//TODO
}
public boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn){
if( gridBagModel.mergeCells(startRow, endRow, startColumn, endColumn)){
repaint();
return true;
}
return false;
}
public boolean mergeCells(int[] rows, int[] columns){
if( gridBagModel.mergeCells(rows, columns)){
repaint();
return true;
}
return false;
}
public boolean spliteCellAt(int row, int column){
if( gridBagModel.spliteCellAt(row, column)){
repaint();
return true;
}
return false;
}
public void changeSelection(int rowIndex, int columnIndex, boolean toggle, boolean extend) {
if( gridBagModel.getCellState( rowIndex , columnIndex ) != GridBagModel.COVERED )
super.changeSelection(rowIndex, columnIndex, toggle, extend);
Point p;
for( int row = rowIndex; row >= 0; row-- ){
for( int col = columnIndex; col >= 0; col-- ){
p = gridBagModel.getGrid(row, col);
//p = ((Point)((Vector)rowVector.get(row)).get(col));
if( col + p.x > columnIndex && row + p.y > rowIndex){
rowIndex = row;
columnIndex = col;
break;
}
}
}
super.changeSelection(rowIndex, columnIndex, toggle, extend);
repaint();
}
public boolean editCellAt(int rowIndex, int columnIndex, EventObject e){
if( gridBagModel.getCellState( rowIndex , columnIndex ) != GridBagModel.COVERED )
return super.editCellAt(rowIndex, columnIndex, e);
Point p;
for( int row = rowIndex; row >= 0; row-- ){
for( int col = columnIndex; col >= 0; col-- ){
p = gridBagModel.getGrid(row, col);
if( col + p.x > columnIndex && row + p.y > rowIndex){
rowIndex = row;
columnIndex = col;
break;
}
}
}
return super.editCellAt(rowIndex, columnIndex, e);
}
}

package org.dxj.guitools.gridbagtable;
import java.awt.Component;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.Enumeration;
import java.util.EventObject;

import javax.swing.DefaultCellEditor;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelEvent;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

/**
 * @author [email protected]
 */
public class GridBagTable extends JTable{

	GridBagModel gridBagModel;
	
	public GridBagModel getGridBagModel() {
		return gridBagModel;
	}
	
	public void setGridBagModel(GridBagModel gridBagModel){
		if( gridBagModel != null && gridBagModel != this.gridBagModel )
			this.gridBagModel = gridBagModel;
	}

	public GridBagTable(AbstractTableModel dm){
		super(dm);		
		getTableHeader().setReorderingAllowed(false);
		gridBagModel = new DefaultGridBagTableModel(dm);		
		getColumnModel().setColumnSelectionAllowed(true);
	}
	
	 private void updateSubComponentUI(Object componentShell) {
        if (componentShell == null) {
            return;
        }
        Component component = null;
        if (componentShell instanceof Component) {
            component = (Component)componentShell;
        }
        if (componentShell instanceof DefaultCellEditor) {
            component = ((DefaultCellEditor)componentShell).getComponent();
        }

        if (component != null) {
            SwingUtilities.updateComponentTreeUI(component);
        }
    }
	
	public void updateUI() {	
        // Update the UIs of the cell renderers, cell editors and header renderers.
        TableColumnModel cm = getColumnModel();
        for(int column = 0; column < cm.getColumnCount(); column++) {
            TableColumn aColumn = cm.getColumn(column);
	    updateSubComponentUI(aColumn.getCellRenderer());
            updateSubComponentUI(aColumn.getCellEditor());
	    updateSubComponentUI(aColumn.getHeaderRenderer());
        }

        // Update the UIs of all the default renderers.
        Enumeration defaultRenderers = defaultRenderersByColumnClass.elements();
        while (defaultRenderers.hasMoreElements()) {
            updateSubComponentUI(defaultRenderers.nextElement());
        }

        // Update the UIs of all the default editors.
        Enumeration defaultEditors = defaultEditorsByColumnClass.elements();
        while (defaultEditors.hasMoreElements()) {
            updateSubComponentUI(defaultEditors.nextElement());
        }

        // Update the UI of the table header
        if (tableHeader != null && tableHeader.getParent() == null) {
            tableHeader.updateUI();
        }
        setUI(new GridBagTableUI());
    }
	
	public Rectangle getGridCellRect(int row, int column, boolean includeSpacing){
		return super.getCellRect(row, column, includeSpacing);
	}
	
	public Rectangle getCellRect(int row, int column, boolean includeSpacing) {		
		Rectangle cellRect = super.getCellRect(row, column, includeSpacing);
		int cols = gridBagModel.getColumnGrid(row, column);
		TableColumnModel cm = getColumnModel();
		for( int n=1; n= 0; row-- ){
			for( int col = columnIndex; col >= 0; col-- ){
				p = gridBagModel.getGrid(row, col);
				//p = ((Point)((Vector)rowVector.get(row)).get(col));
				if( col + p.x > columnIndex && row + p.y > rowIndex){
					rowIndex = row;
					columnIndex = col;
					break;
				}
    		}
		}  	
    	super.changeSelection(rowIndex, columnIndex, toggle, extend);
    	repaint();
    }
    
    public boolean editCellAt(int rowIndex, int columnIndex, EventObject e){
    	if( gridBagModel.getCellState( rowIndex , columnIndex ) != GridBagModel.COVERED  )
    		return super.editCellAt(rowIndex, columnIndex, e);   
		Point p;
		for( int row = rowIndex; row >= 0; row-- ){
			for( int col = columnIndex; col >= 0; col-- ){
				p = gridBagModel.getGrid(row, col);
				if( col + p.x > columnIndex && row + p.y > rowIndex){
					rowIndex = row;
					columnIndex = col;
					break;
				}
    		}
		}   	
    	return super.editCellAt(rowIndex, columnIndex, e);        
    }
}

Java代码

package org.dxj.guitools.gridbagtable;
import java.awt.Point;
public interface GridBagModel {
//格子处于正常状态
int DEFAULT = 0;
//格子合并了其他的格子
int MERGE = 1;
//格子被其他格子合并
int COVERED = -1;
/**
* @param row 行
* @param column 列
* @return 该单元格在行、列的跨度
*/
Point getGrid(int row, int column);
/**
* 在Y轴方向的跨度
* @param row
* @param column
* @return
*/
int getRowGrid(int row, int column);
/**
* 在X轴方向的跨度
* @param row
* @param column
* @return
*/
int getColumnGrid(int row, int column);
/**
* @param rows 行集合
* @param columns 列集合
* @return 单元格集合是否可以合并在一起
*/
boolean canMergeCells(int[] rows, int[] columns);
/**
* 判断该单元格状态
* @param row
* @param column
* @return MERGE|DEFAULT|COVERED
*/
int getCellState(int row, int column);
/**
* 将单元格集合合并
* @param startRow 开始行
* @param endRow 结束行
* @param startColumn 开始列
* @param endColumn 结束列
* @return 是否合并成功
*/
boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn);
/**
* 将单元格集合合并
* @param rows 行集合
* @param columns 列集合
* @return 是否合并成功
*/
boolean mergeCells(int[] rows, int[] columns);
/**
* 拆分单元格
* @param row 行
* @param column 列
* @return 是否拆分成功
*/
boolean spliteCellAt(int row, int column);
/**
* 清除所有合并
*/
void clearMergence();
}

package org.dxj.guitools.gridbagtable;

import java.awt.Point;

public interface GridBagModel {
	//格子处于正常状态
	int DEFAULT = 0;
	//格子合并了其他的格子
	int MERGE = 1;
	//格子被其他格子合并
	int COVERED = -1;
	
	/**
	 * @param row 行
	 * @param column 列
	 * @return 该单元格在行、列的跨度
	 */
	Point getGrid(int row, int column);
	
	/**
	 * 在Y轴方向的跨度
	 * @param row
	 * @param column
	 * @return
	 */
	int getRowGrid(int row, int column);
	
	/**
	 * 在X轴方向的跨度
	 * @param row
	 * @param column
	 * @return
	 */
	int getColumnGrid(int row, int column);

	/**
	 * @param rows 行集合
	 * @param columns 列集合
	 * @return 单元格集合是否可以合并在一起
	 */
	boolean canMergeCells(int[] rows, int[] columns);
	
	/**
	 * 判断该单元格状态
	 * @param row
	 * @param column
	 * @return MERGE|DEFAULT|COVERED
	 */
	int getCellState(int row, int column);
	
	/**
	 * 将单元格集合合并
	 * @param startRow 开始行
	 * @param endRow 结束行
	 * @param startColumn 开始列
	 * @param endColumn 结束列
	 * @return 是否合并成功
	 */
	boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn);
	
	/**
	 * 将单元格集合合并
	 * @param rows 行集合
	 * @param columns 列集合
	 * @return 是否合并成功
	 */
	boolean mergeCells(int[] rows, int[] columns);
	
	/**
	 * 拆分单元格
	 * @param row 行
	 * @param column 列
	 * @return 是否拆分成功
	 */
	boolean spliteCellAt(int row, int column);
	
	/**
	 * 清除 所有合并
	 */
	void clearMergence();
}

Java代码

package org.dxj.guitools.gridbagtable;
import java.awt.Point;
import java.util.Arrays;
import java.util.List;
import java.util.Vector;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
public class DefaultGridBagTableModel implements GridBagModel, TableModelListener{
protected AbstractTableModel model;
protected List> gridInfo;
DefaultGridBagTableModel(AbstractTableModel model){
gridInfo = new Vector>();
setTableModel(model);
}
public void setTableModel(AbstractTableModel model){
if( model != null && model != this.model ){
if( this.model != null )
this.model.removeTableModelListener(this);
//防止多次添加监听器
model.removeTableModelListener(this);
model.addTableModelListener(this);
this.model = model;
clearMergence();
}
}
public void clearMergence(){
if( gridInfo == null )
gridInfo = new Vector>();
else
gridInfo.clear();
if( model == null )
return;
//初始化，每个格子占的格子数为(1,1);
for(int row=model.getRowCount(); --row>=0;){
List infos = new Vector();
gridInfo.add(infos);
for(int col=model.getColumnCount(); --col>=0;){
infos.add(getDefaultPoint());
}
}
}
public Point getDefaultPoint(){
return new Point(1,1);
}
@Override
public boolean canMergeCells(int[] rows, int[] columns) {
if( rows == null || columns == null ) return false;
Arrays.sort(rows);
for(int index=0; index1; index++){
if( rows[index+1] - rows[index] > 1 )
return false;
}
Arrays.sort(columns);
for(int index=0; index1; index++){
if( columns[index+1] - columns[index] > 1 )
return false;
}
return true;
}
@Override
public int getCellState(int row, int column) {
Point grid = getGrid(row, column);
if( grid == null ) return DEFAULT;
if( grid.x>1 || grid.y>1 )
return MERGE;
if( grid.x<=0 || grid.y<=0 )
return COVERED;
return DEFAULT;
}
@Override
public int getColumnGrid(int row, int column) {
if( gridInfo != null && row >=0 && row < gridInfo.size() ){
List gridRow = gridInfo.get(row);
if( gridRow != null && column >=0 && column < gridRow.size() ){
Point point = gridRow.get(column);
if( point != null )
return point.x;
}
}
return 1;
}
@Override
public Point getGrid(int row, int column) {
if( gridInfo != null && row >=0 && row < gridInfo.size() ){
List gridRow = gridInfo.get(row);
if( gridRow != null && column >=0 && column < gridRow.size() ){
return gridRow.get(column);
}
}
return getDefaultPoint();
}
@Override
public int getRowGrid(int row, int column) {
if( gridInfo != null && row >=0 && row < gridInfo.size() ){
List gridRow = gridInfo.get(row);
if( gridRow != null && column >=0 && column < gridRow.size() ){
Point point = gridRow.get(column);
if( point != null )
return point.y;
}
}
return 1;
}
protected boolean setGrid(int row, int column, Point grid) {
if( gridInfo != null && row >=0 && row < gridInfo.size() ){
List gridRow = gridInfo.get(row);
if( gridRow != null && column >=0 && column < gridRow.size() ){
Point point = gridRow.get(column);
if( point != null ){
point.setLocation(grid);
}
else{
gridRow.set(column, grid.getLocation());
}
return true;
}
}
return false;
}
@Override
public boolean spliteCellAt(int row, int column) {
if( gridInfo != null && row >=0 && row < gridInfo.size() ){
List gridRow = gridInfo.get(row);
if( gridRow != null && column >=0 && column < gridRow.size() ){
Point point = gridRow.get(column);
if( point != null ){
point = point.getLocation();
for(int a=0; a
for(int b=0; b
setGrid(row+a, column+b, getDefaultPoint());
}
}
}
else{
gridRow.set(column, getDefaultPoint());
}
return true;
}
}
return false;
}
@Override
/**
* table中发生行的添加和删除的时候需要修改该模型
*/
public void tableChanged(TableModelEvent e) {
//TODO
}
@Override
public boolean mergeCells(int[] rows, int[] columns) {
if( !canMergeCells(rows, columns) )
return false;
Arrays.sort(rows);
Arrays.sort(columns);
return mergeCells(rows[0],rows[rows.length-1],columns[0],columns[columns.length-1]);
}
@Override
public boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn) {
setGrid(startRow, startColumn, new Point(endColumn-startColumn+1, endRow-startRow+1));
for(int row=startRow; row<=endRow; row++){
for(int col=startColumn; col<=endColumn; col++){
if(row==startRow&&col==startColumn)
continue;
else
setGrid(row, col, new Point(COVERED,COVERED));
}
}
return true;
}
public String toString(){
if( gridInfo == null )
return "";
StringBuffer sb = new StringBuffer();
for(List rowInfo : gridInfo ){
for(Point grid : rowInfo){
sb.append("["+grid.x+","+grid.y+"], ");
}
sb.append("\n");
}
return sb.toString();
}
}

package org.dxj.guitools.gridbagtable;

import java.awt.Point;
import java.util.Arrays;
import java.util.List;
import java.util.Vector;

import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;

public class DefaultGridBagTableModel implements GridBagModel, TableModelListener{
	protected AbstractTableModel model;
	protected List> gridInfo;
	
	DefaultGridBagTableModel(AbstractTableModel model){
		gridInfo = new Vector>();
		setTableModel(model);
	}
	
	public void setTableModel(AbstractTableModel model){
		if( model != null && model != this.model ){
			if( this.model != null )
				this.model.removeTableModelListener(this);
			//防止多次添加监听器
			model.removeTableModelListener(this);
			model.addTableModelListener(this);
			this.model = model;
			clearMergence();
		}
	}
	
	public void clearMergence(){
		if( gridInfo == null  )
			gridInfo = new Vector>();
		else
			gridInfo.clear();
		
		if( model == null )
			return;
		
		//初始化，每个格子占的格子数为(1,1);
		for(int row=model.getRowCount(); --row>=0;){
			List infos = new Vector();
			gridInfo.add(infos);
			for(int col=model.getColumnCount(); --col>=0;){
				infos.add(getDefaultPoint());
			}
		}
	}
	
	public Point getDefaultPoint(){
		return new Point(1,1);
	}
	
	@Override
	public boolean canMergeCells(int[] rows, int[] columns) {
		if( rows == null || columns == null ) return false;
		Arrays.sort(rows);
		for(int index=0; index 1 )
				return false;
		}
		Arrays.sort(columns);
		for(int index=0; index 1 )
				return false;
		}
		return true;
	}
	
	@Override
	public int getCellState(int row, int column) {
		Point grid = getGrid(row, column);
		if( grid == null ) return DEFAULT;
		if( grid.x>1 || grid.y>1 )
			return MERGE;
		if( grid.x<=0 || grid.y<=0 )
			return COVERED;
		return DEFAULT;
	}

	@Override
	public int getColumnGrid(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null )
					return point.x;
			}	
		}
		return 1;
	}

	@Override
	public Point getGrid(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				return gridRow.get(column);
			}	
		}
		return getDefaultPoint();
	}

	@Override
	public int getRowGrid(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null )
					return point.y;
			}	
		}
		return 1;
	}

	protected boolean setGrid(int row, int column, Point grid) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null ){
					point.setLocation(grid);
				}
				else{
					gridRow.set(column, grid.getLocation());
				}
				return true;
			}	
		}
		return false;
	}

	@Override
	public boolean spliteCellAt(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null ){
					point = point.getLocation();
					for(int a=0; a rowInfo : gridInfo ){
			for(Point grid : rowInfo){
				sb.append("["+grid.x+","+grid.y+"], ");
			}
			sb.append("\n");
		}
		return sb.toString();
	}
}

Java代码

package org.dxj.guitools.gridbagtable;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.Enumeration;
import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicTableUI;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class GridBagTableUI extends BasicTableUI
{
public Dimension getPreferredSize(JComponent c) {
long width = 0;
Enumeration enumeration = table.getColumnModel().getColumns();
while (enumeration.hasMoreElements()) {
TableColumn aColumn = (TableColumn)enumeration.nextElement();
width = width + aColumn.getPreferredWidth();
}
return createTableSize(width);
}
private Dimension createTableSize(long width) {
int height = 0;
int rowCount = table.getRowCount();
if (rowCount > 0 && table.getColumnCount() > 0) {
Rectangle r = table.getCellRect(rowCount-1, 0, true);
height = r.y + r.height;
}
// Width is always positive. The call to abs() is a workaround for
// a bug in the 1.1.6 JIT on Windows.
long tmp = Math.abs(width);
if (tmp > Integer.MAX_VALUE) {
tmp = Integer.MAX_VALUE;
}
return new Dimension((int)tmp, height);
}
public void paint(Graphics g, JComponent c) {
Rectangle clip = g.getClipBounds();
Rectangle bounds = table.getBounds();
// account for the fact that the graphics has already been translated
// into the table's bounds
bounds.x = bounds.y = 0;
if (table.getRowCount() <= 0 || table.getColumnCount() <= 0 ||
// this check prevents us from painting the entire table
// when the clip doesn't intersect our bounds at all
!bounds.intersects(clip)) {
paintDropLines(g);
return;
}
boolean ltr = table.getComponentOrientation().isLeftToRight();
Point upperLeft = clip.getLocation();
if (!ltr) {
upperLeft.x++;
}
Point lowerRight = new Point(clip.x + clip.width - (ltr ? 1 : 0),
clip.y + clip.height);
int rMin = table.rowAtPoint(upperLeft);
int rMax = table.rowAtPoint(lowerRight);
// This should never happen (as long as our bounds intersect the clip,
// which is why we bail above if that is the case).
if (rMin == -1) {
rMin = 0;
}
// If the table does not have enough rows to fill the view we'll get -1.
// (We could also get -1 if our bounds don't intersect the clip,
// which is why we bail above if that is the case).
// Replace this with the index of the last row.
if (rMax == -1) {
rMax = table.getRowCount()-1;
}
int cMin = table.columnAtPoint(ltr ? upperLeft : lowerRight);
int cMax = table.columnAtPoint(ltr ? lowerRight : upperLeft);
// This should never happen.
if (cMin == -1) {
cMin = 0;
}
// If the table does not have enough columns to fill the view we'll get -1.
// Replace this with the index of the last column.
if (cMax == -1) {
cMax = table.getColumnCount()-1;
}
// Paint the grid.
//paintGrid(g, rMin, rMax, cMin, cMax);
// Paint the cells.
paintCells(g, rMin, rMax, cMin, cMax);
paintDropLines(g);
}
private void paintDropLines(Graphics g) {
JTable.DropLocation loc = table.getDropLocation();
if (loc == null) {
return;
}
Color color = UIManager.getColor("Table.dropLineColor");
Color shortColor = UIManager.getColor("Table.dropLineShortColor");
if (color == null && shortColor == null) {
return;
}
Rectangle rect;
rect = getHDropLineRect(loc);
if (rect != null) {
int x = rect.x;
int w = rect.width;
if (color != null) {
extendRect(rect, true);
g.setColor(color);
g.fillRect(rect.x, rect.y, rect.width, rect.height);
}
if (!loc.isInsertColumn() && shortColor != null) {
g.setColor(shortColor);
g.fillRect(x, rect.y, w, rect.height);
}
}
rect = getVDropLineRect(loc);
if (rect != null) {
int y = rect.y;
int h = rect.height;
if (color != null) {
extendRect(rect, false);
g.setColor(color);
g.fillRect(rect.x, rect.y, rect.width, rect.height);
}
if (!loc.isInsertRow() && shortColor != null) {
g.setColor(shortColor);
g.fillRect(rect.x, y, rect.width, h);
}
}
}
/*
* Paints the grid lines within aRect, using the grid
* color set with setGridColor. Paints vertical lines
* if getShowVerticalLines() returns true and paints
* horizontal lines if getShowHorizontalLines()
* returns true.
*/
private void paintGrid(Graphics g, int rMin, int rMax, int cMin, int cMax) {
g.setColor(table.getGridColor());
Rectangle minCell = table.getCellRect(rMin, cMin, true);
Rectangle maxCell = table.getCellRect(rMax, cMax, true);
Rectangle damagedArea = minCell.union( maxCell );
if (table.getShowHorizontalLines()) {
int tableWidth = damagedArea.x + damagedArea.width;
int y = damagedArea.y;
for (int row = rMin; row <= rMax; row++) {
y += table.getRowHeight(row);
g.drawLine(damagedArea.x, y - 1, tableWidth - 1, y - 1);
}
}
if (table.getShowVerticalLines()) {
TableColumnModel cm = table.getColumnModel();
int tableHeight = damagedArea.y + damagedArea.height;
int x;
if (table.getComponentOrientation().isLeftToRight()) {
x = damagedArea.x;
for (int column = cMin; column <= cMax; column++) {
int w = cm.getColumn(column).getWidth();
x += w;
g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
}
} else {
x = damagedArea.x;
for (int column = cMax; column >= cMin; column--) {
int w = cm.getColumn(column).getWidth();
x += w;
g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
}
}
}
}
private void paintCells(Graphics g, int rMin, int rMax, int cMin, int cMax) {
JTableHeader header = table.getTableHeader();
TableColumn draggedColumn = (header == null) ? null : header.getDraggedColumn();
TableColumnModel cm = table.getColumnModel();
int columnMargin = cm.getColumnMargin();
Rectangle cellRect;
TableColumn aColumn;
int columnWidth;
if (table.getComponentOrientation().isLeftToRight()) {
for(int row = rMin; row <= rMax; row++) {
if( table instanceof GridBagTable )
cellRect = ((GridBagTable)table).getGridCellRect(row, cMin, false);
else
cellRect = table.getCellRect(row, cMin, false);
for(int column = cMin; column <= cMax; column++) {
aColumn = cm.getColumn(column);
columnWidth = aColumn.getWidth();
//TODO
cellRect.width = columnWidth - columnMargin;
int oldHeight = cellRect.height;
if( table instanceof GridBagTable ){
if(((GridBagTable)table).getGridBagModel().getCellState( row, column) == GridBagModel.COVERED ) {
cellRect.width = 0;
cellRect.height = 0;
}
else{
int h = ((GridBagTable)table).getGridBagModel().getColumnGrid(row, column);
if( h >1 ){
for( int n=1; n
cellRect.width += cm.getColumn(column+n).getWidth();
}
int v = ((GridBagTable)table).getGridBagModel().getRowGrid(row, column);
if( v >1 ){
for( int n=1; n
cellRect.height += table.getRowHeight(row+n);
}
}
}
if (aColumn != draggedColumn) {
paintCell(g, cellRect, row, column);
}
cellRect.height = oldHeight;
cellRect.x += columnWidth;
}
}
} else {
for(int row = rMin; row <= rMax; row++) {
cellRect = table.getCellRect(row, cMin, false);
aColumn = cm.getColumn(cMin);
if (aColumn != draggedColumn) {
columnWidth = aColumn.getWidth();
cellRect.width = columnWidth - columnMargin;
paintCell(g, cellRect, row, cMin);
}
for(int column = cMin+1; column <= cMax; column++) {
aColumn = cm.getColumn(column);
columnWidth = aColumn.getWidth();
// TODO
cellRect.width = columnWidth - columnMargin;
cellRect.x -= columnWidth;
if (aColumn != draggedColumn) {
paintCell(g, cellRect, row, column);
}
}
}
}
// Paint the dragged column if we are dragging.
if (draggedColumn != null) {
paintDraggedArea(g, rMin, rMax, draggedColumn, header.getDraggedDistance());
}
// Remove any renderers that may be left in the rendererPane.
rendererPane.removeAll();
}
private void paintCell(Graphics g, Rectangle cellRect, int row, int column) {
if (table.isEditing() && table.getEditingRow()==row &&
table.getEditingColumn()==column) {
Component component = table.getEditorComponent();
component.setBounds(cellRect);
component.validate();
}
else {
TableCellRenderer renderer = table.getCellRenderer(row, column);
Component component = table.prepareRenderer(renderer, row, column);
if( component instanceof JComponent ){
((JComponent)component).setBorder(BorderFactory.createLineBorder(Color.gray));
}
rendererPane.paintComponent(g, component, table, cellRect.x, cellRect.y,
cellRect.width, cellRect.height, true);
}
}
private Rectangle getHDropLineRect(JTable.DropLocation loc) {
if (!loc.isInsertRow()) {
return null;
}
int row = loc.getRow();
int col = loc.getColumn();
if (col >= table.getColumnCount()) {
col--;
}
Rectangle rect = table.getCellRect(row, col, true);
if (row >= table.getRowCount()) {
row--;
Rectangle prevRect = table.getCellRect(row, col, true);
rect.y = prevRect.y + prevRect.height;
}
if (rect.y == 0) {
rect.y = -1;
} else {
rect.y -= 2;
}
rect.height = 3;
return rect;
}
private void paintDraggedArea(Graphics g, int rMin, int rMax, TableColumn draggedColumn, int distance) {
int draggedColumnIndex = viewIndexForColumn(draggedColumn);
Rectangle minCell = table.getCellRect(rMin, draggedColumnIndex, true);
Rectangle maxCell = table.getCellRect(rMax, draggedColumnIndex, true);
Rectangle vacatedColumnRect = minCell.union(maxCell);
// Paint a gray well in place of the moving column.
g.setColor(table.getParent().getBackground());
g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
vacatedColumnRect.width, vacatedColumnRect.height);
// Move to the where the cell has been dragged.
vacatedColumnRect.x += distance;
// Fill the background.
g.setColor(table.getBackground());
g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
vacatedColumnRect.width, vacatedColumnRect.height);
// Paint the vertical grid lines if necessary.
if (table.getShowVerticalLines()) {
g.setColor(table.getGridColor());
int x1 = vacatedColumnRect.x;
int y1 = vacatedColumnRect.y;
int x2 = x1 + vacatedColumnRect.width - 1;
int y2 = y1 + vacatedColumnRect.height - 1;
// Left
g.drawLine(x1-1, y1, x1-1, y2);
// Right
g.drawLine(x2, y1, x2, y2);
}
for(int row = rMin; row <= rMax; row++) {
// Render the cell value
Rectangle r = table.getCellRect(row, draggedColumnIndex, false);
r.x += distance;
paintCell(g, r, row, draggedColumnIndex);
// Paint the (lower) horizontal grid line if necessary.
if (table.getShowHorizontalLines()) {
g.setColor(table.getGridColor());
Rectangle rcr = table.getCellRect(row, draggedColumnIndex, true);
rcr.x += distance;
int x1 = rcr.x;
int y1 = rcr.y;
int x2 = x1 + rcr.width - 1;
int y2 = y1 + rcr.height - 1;
g.drawLine(x1, y2, x2, y2);
}
}
}
private int viewIndexForColumn(TableColumn aColumn) {
TableColumnModel cm = table.getColumnModel();
for (int column = 0; column < cm.getColumnCount(); column++) {
if (cm.getColumn(column) == aColumn) {
return column;
}
}
return -1;
}
private Rectangle extendRect(Rectangle rect, boolean horizontal) {
if (rect == null) {
return rect;
}
if (horizontal) {
rect.x = 0;
rect.width = table.getWidth();
} else {
rect.y = 0;
if (table.getRowCount() != 0) {
Rectangle lastRect = table.getCellRect(table.getRowCount() - 1, 0, true);
rect.height = lastRect.y + lastRect.height;
} else {
rect.height = table.getHeight();
}
}
return rect;
}
private Rectangle getVDropLineRect(JTable.DropLocation loc) {
if (!loc.isInsertColumn()) {
return null;
}
boolean ltr = table.getComponentOrientation().isLeftToRight();
int col = loc.getColumn();
Rectangle rect = table.getCellRect(loc.getRow(), col, true);
if (col >= table.getColumnCount()) {
col--;
rect = table.getCellRect(loc.getRow(), col, true);
if (ltr) {
rect.x = rect.x + rect.width;
}
} else if (!ltr) {
rect.x = rect.x + rect.width;
}
if (rect.x == 0) {
rect.x = -1;
} else {
rect.x -= 2;
}
rect.width = 3;
return rect;
}
} // End of Class BasicTableUI

package org.dxj.guitools.gridbagtable;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.Enumeration;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicTableUI;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class GridBagTableUI extends BasicTableUI
{
    public Dimension getPreferredSize(JComponent c) {
        long width = 0;
        Enumeration enumeration = table.getColumnModel().getColumns();
        while (enumeration.hasMoreElements()) {
            TableColumn aColumn = (TableColumn)enumeration.nextElement();
            width = width + aColumn.getPreferredWidth();
        }
        return createTableSize(width);
    }
    
    private Dimension createTableSize(long width) {
    	int height = 0;
    	int rowCount = table.getRowCount();
    	if (rowCount > 0 && table.getColumnCount() > 0) {
    	    Rectangle r = table.getCellRect(rowCount-1, 0, true);
    	    height = r.y + r.height;
    	}
    	// Width is always positive. The call to abs() is a workaround for
    	// a bug in the 1.1.6 JIT on Windows.
    	long tmp = Math.abs(width);
            if (tmp > Integer.MAX_VALUE) {
                tmp = Integer.MAX_VALUE;
            }
    	return new Dimension((int)tmp, height);
        }
    
    public void paint(Graphics g, JComponent c) {
        Rectangle clip = g.getClipBounds();

        Rectangle bounds = table.getBounds();
        // account for the fact that the graphics has already been translated
        // into the table's bounds
        bounds.x = bounds.y = 0;

	if (table.getRowCount() <= 0 || table.getColumnCount() <= 0 ||
                // this check prevents us from painting the entire table
                // when the clip doesn't intersect our bounds at all
                !bounds.intersects(clip)) {

            paintDropLines(g);
	    return;
	}

        boolean ltr = table.getComponentOrientation().isLeftToRight();

	Point upperLeft = clip.getLocation();
        if (!ltr) {
            upperLeft.x++;
        }

	Point lowerRight = new Point(clip.x + clip.width - (ltr ? 1 : 0),
                                     clip.y + clip.height);

        int rMin = table.rowAtPoint(upperLeft);
        int rMax = table.rowAtPoint(lowerRight);
        // This should never happen (as long as our bounds intersect the clip,
        // which is why we bail above if that is the case).
        if (rMin == -1) {
	    rMin = 0;
        }
        // If the table does not have enough rows to fill the view we'll get -1.
        // (We could also get -1 if our bounds don't intersect the clip,
        // which is why we bail above if that is the case).
        // Replace this with the index of the last row.
        if (rMax == -1) {
	    rMax = table.getRowCount()-1;
        }

        int cMin = table.columnAtPoint(ltr ? upperLeft : lowerRight); 
        int cMax = table.columnAtPoint(ltr ? lowerRight : upperLeft);        
        // This should never happen.
        if (cMin == -1) {
	    cMin = 0;
        }
	// If the table does not have enough columns to fill the view we'll get -1.
        // Replace this with the index of the last column.
        if (cMax == -1) {
	    cMax = table.getColumnCount()-1;
        }

        // Paint the grid.
        //paintGrid(g, rMin, rMax, cMin, cMax);

        // Paint the cells.
	paintCells(g, rMin, rMax, cMin, cMax);

        paintDropLines(g);
    }
    
    private void paintDropLines(Graphics g) {
        JTable.DropLocation loc = table.getDropLocation();
        if (loc == null) {
            return;
        }

        Color color = UIManager.getColor("Table.dropLineColor");
        Color shortColor = UIManager.getColor("Table.dropLineShortColor");
        if (color == null && shortColor == null) {
            return;
        }

        Rectangle rect;

        rect = getHDropLineRect(loc);
        if (rect != null) {
            int x = rect.x;
            int w = rect.width;
            if (color != null) {
                extendRect(rect, true);
                g.setColor(color);
                g.fillRect(rect.x, rect.y, rect.width, rect.height);
            }
            if (!loc.isInsertColumn() && shortColor != null) {
                g.setColor(shortColor);
                g.fillRect(x, rect.y, w, rect.height);
            }
        }

        rect = getVDropLineRect(loc);
        if (rect != null) {
            int y = rect.y;
            int h = rect.height;
            if (color != null) {
                extendRect(rect, false);
                g.setColor(color);
                g.fillRect(rect.x, rect.y, rect.width, rect.height);
            }
            if (!loc.isInsertRow() && shortColor != null) {
                g.setColor(shortColor);
                g.fillRect(rect.x, y, rect.width, h);
            }
        }
    }
    
    /*
     * Paints the grid lines within aRect, using the grid
     * color set with setGridColor. Paints vertical lines
     * if getShowVerticalLines() returns true and paints
     * horizontal lines if getShowHorizontalLines()
     * returns true.
     */
    private void paintGrid(Graphics g, int rMin, int rMax, int cMin, int cMax) {
        g.setColor(table.getGridColor());

        Rectangle minCell = table.getCellRect(rMin, cMin, true);
        Rectangle maxCell = table.getCellRect(rMax, cMax, true);
        Rectangle damagedArea = minCell.union( maxCell );

		if (table.getShowHorizontalLines()) {
			int tableWidth = damagedArea.x + damagedArea.width;
			int y = damagedArea.y;
			for (int row = rMin; row <= rMax; row++) {
				y += table.getRowHeight(row);
				g.drawLine(damagedArea.x, y - 1, tableWidth - 1, y - 1);
			}
		}
		if (table.getShowVerticalLines()) {
			TableColumnModel cm = table.getColumnModel();
			int tableHeight = damagedArea.y + damagedArea.height;
			int x;
			if (table.getComponentOrientation().isLeftToRight()) {
				x = damagedArea.x;
				for (int column = cMin; column <= cMax; column++) {
					int w = cm.getColumn(column).getWidth();
					x += w;
					g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
				}
			} else {
				x = damagedArea.x;
				for (int column = cMax; column >= cMin; column--) {
					int w = cm.getColumn(column).getWidth();
					x += w;
					g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
				}
			}
		}
    }
    
    private void paintCells(Graphics g, int rMin, int rMax, int cMin, int cMax) {
    	JTableHeader header = table.getTableHeader();
    	TableColumn draggedColumn = (header == null) ? null : header.getDraggedColumn();

    	TableColumnModel cm = table.getColumnModel();
    	int columnMargin = cm.getColumnMargin();
            Rectangle cellRect;
    	TableColumn aColumn;
    	int columnWidth;
    	if (table.getComponentOrientation().isLeftToRight()) {
    	    for(int row = rMin; row <= rMax; row++) {
    	    	if( table instanceof GridBagTable )
    	    		cellRect = ((GridBagTable)table).getGridCellRect(row, cMin, false);
    	    	else
    	    		cellRect = table.getCellRect(row, cMin, false);
                for(int column = cMin; column <= cMax; column++) {
                    aColumn = cm.getColumn(column);
                    columnWidth = aColumn.getWidth();                                 
                    //TODO
                    cellRect.width = columnWidth - columnMargin;
                    int oldHeight = cellRect.height;
                    if( table instanceof GridBagTable ){
                    	if(((GridBagTable)table).getGridBagModel().getCellState( row, column) == GridBagModel.COVERED ) {
                        	cellRect.width = 0;
                        	cellRect.height = 0;
                        }
                    	else{
                    		int h = ((GridBagTable)table).getGridBagModel().getColumnGrid(row, column);
                        	if( h >1 ){
                        		for( int n=1; n1 ){
                        		for( int n=1; n= table.getColumnCount()) {
            col--;
        }

        Rectangle rect = table.getCellRect(row, col, true);

        if (row >= table.getRowCount()) {
            row--;
            Rectangle prevRect = table.getCellRect(row, col, true);
            rect.y = prevRect.y + prevRect.height;
        }

        if (rect.y == 0) {
            rect.y = -1;
        } else {
            rect.y -= 2;
        }

        rect.height = 3;

        return rect;
    }
    
    private void paintDraggedArea(Graphics g, int rMin, int rMax, TableColumn draggedColumn, int distance) {
        int draggedColumnIndex = viewIndexForColumn(draggedColumn);

        Rectangle minCell = table.getCellRect(rMin, draggedColumnIndex, true);
	Rectangle maxCell = table.getCellRect(rMax, draggedColumnIndex, true);

	Rectangle vacatedColumnRect = minCell.union(maxCell);

	// Paint a gray well in place of the moving column.
	g.setColor(table.getParent().getBackground());
	g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
		   vacatedColumnRect.width, vacatedColumnRect.height);

	// Move to the where the cell has been dragged.
	vacatedColumnRect.x += distance;

	// Fill the background.
	g.setColor(table.getBackground());
	g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
		   vacatedColumnRect.width, vacatedColumnRect.height);

	// Paint the vertical grid lines if necessary.
	if (table.getShowVerticalLines()) {
	    g.setColor(table.getGridColor());
	    int x1 = vacatedColumnRect.x;
	    int y1 = vacatedColumnRect.y;
	    int x2 = x1 + vacatedColumnRect.width - 1;
	    int y2 = y1 + vacatedColumnRect.height - 1;
	    // Left
	    g.drawLine(x1-1, y1, x1-1, y2);
	    // Right
	    g.drawLine(x2, y1, x2, y2);
	}

	for(int row = rMin; row <= rMax; row++) {
	    // Render the cell value
	    Rectangle r = table.getCellRect(row, draggedColumnIndex, false);
	    r.x += distance;
	    paintCell(g, r, row, draggedColumnIndex);

	    // Paint the (lower) horizontal grid line if necessary.
	    if (table.getShowHorizontalLines()) {
		g.setColor(table.getGridColor());
		Rectangle rcr = table.getCellRect(row, draggedColumnIndex, true);
		rcr.x += distance;
		int x1 = rcr.x;
		int y1 = rcr.y;
		int x2 = x1 + rcr.width - 1;
		int y2 = y1 + rcr.height - 1;
		g.drawLine(x1, y2, x2, y2);
	    }
	}
    }
    
    private int viewIndexForColumn(TableColumn aColumn) {
        TableColumnModel cm = table.getColumnModel();
        for (int column = 0; column < cm.getColumnCount(); column++) {
            if (cm.getColumn(column) == aColumn) {
                return column;
            }
        }
        return -1;
    }
    
    private Rectangle extendRect(Rectangle rect, boolean horizontal) {
        if (rect == null) {
            return rect;
        }

        if (horizontal) {
            rect.x = 0;
            rect.width = table.getWidth();
        } else {
            rect.y = 0;

            if (table.getRowCount() != 0) {
                Rectangle lastRect = table.getCellRect(table.getRowCount() - 1, 0, true);
                rect.height = lastRect.y + lastRect.height;
            } else {
                rect.height = table.getHeight();
            }
        }

        return rect;
    }
    
    private Rectangle getVDropLineRect(JTable.DropLocation loc) {
        if (!loc.isInsertColumn()) {
            return null;
        }

        boolean ltr = table.getComponentOrientation().isLeftToRight();
        int col = loc.getColumn();
        Rectangle rect = table.getCellRect(loc.getRow(), col, true);

        if (col >= table.getColumnCount()) {
            col--;
            rect = table.getCellRect(loc.getRow(), col, true);
            if (ltr) {
                rect.x = rect.x + rect.width;
            }
        } else if (!ltr) {
            rect.x = rect.x + rect.width;
        }

        if (rect.x == 0) {
            rect.x = -1;
        } else {
            rect.x -= 2;
        }
        
        rect.width = 3;

        return rect;
    }

}  // End of Class BasicTableUI

测试代码：

Java代码

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.table.DefaultTableModel;
import com.jrf.jgrid.guitools.gridbagtable.GridBagTable;
public class Test implements ActionListener{
GridBagTable table;
public Test()
{
JFrame d = new JFrame();
DefaultTableModel model = new DefaultTableModel(5,5);
table = new GridBagTable(model);
table.setRowHeight(20);
JScrollPane pane = new JScrollPane(table);
d.getContentPane().add(pane, BorderLayout.CENTER);
JButton btn = new JButton("合并/拆分");
d.getContentPane().add(btn, BorderLayout.NORTH);
btn.addActionListener(this);
d.setBounds(0, 0, 400, 400);
d.setVisible(true);
}
public static void main(String[] fsd){
new Test();
}
public void actionPerformed(ActionEvent e) {
table.mergeCells(table.getSelectedRows(), table.getSelectedColumns());
}
} 年前在网上参加了一个JavaSwing的招聘上机考试。招聘方要求开发一个类似EXCEL支持单元格合并的JTable。差不多用了5天的时间提交代码，最后被告知测试通过，我提出是否可做兼职，对方回复需要到上海做全职开发，最后也就放弃了。最近公司的一个项目中需要用到以前的代码，偶又重构了一次，设计思想来源于ListSelectionModel。

GridBagModel：抽象模型接口。该接口用于描述表格中单元格的合并状态。
DefaultGridBagTableModel：GridBagModel的默认实现。
GridBagTable：继承自JTable的控制器。通过该类中的方法控制表格单元的合并和拆分。
GridBagTableUI：GridBagTable对应的UI。

TODO：(已合并)行、列的插入，删除操作对应的GridBagModel的修改，不过已留接口。
Java代码
1. package org.dxj.guitools.gridbagtable;
2. import java.awt.Component;
3. import java.awt.Point;
4. import java.awt.Rectangle;
5. import java.util.Enumeration;
6. import java.util.EventObject;
8. import javax.swing.DefaultCellEditor;
9. import javax.swing.JTable;
10. import javax.swing.SwingUtilities;
11. import javax.swing.event.TableModelEvent;
12. import javax.swing.table.AbstractTableModel;
13. import javax.swing.table.TableColumn;
14. import javax.swing.table.TableColumnModel;
16. /**
17. * @author [email protected]
18. */
19. public class GridBagTable extends JTable{
21. GridBagModel gridBagModel;
23. public GridBagModel getGridBagModel() {
24. return gridBagModel;
25. }
27. public void setGridBagModel(GridBagModel gridBagModel){
28. if( gridBagModel != null && gridBagModel != this.gridBagModel )
29. this.gridBagModel = gridBagModel;
30. }
32. public GridBagTable(AbstractTableModel dm){
33. super(dm);
34. getTableHeader().setReorderingAllowed(false);
35. gridBagModel = new DefaultGridBagTableModel(dm);
36. getColumnModel().setColumnSelectionAllowed(true);
37. }
39. private void updateSubComponentUI(Object componentShell) {
40. if (componentShell == null) {
41. return;
42. }
43. Component component = null;
44. if (componentShell instanceof Component) {
45. component = (Component)componentShell;
46. }
47. if (componentShell instanceof DefaultCellEditor) {
48. component = ((DefaultCellEditor)componentShell).getComponent();
49. }
51. if (component != null) {
52. SwingUtilities.updateComponentTreeUI(component);
53. }
54. }
56. public void updateUI() {
57. // Update the UIs of the cell renderers, cell editors and header renderers.
58. TableColumnModel cm = getColumnModel();
59. for(int column = 0; column < cm.getColumnCount(); column++) {
60. TableColumn aColumn = cm.getColumn(column);
61. updateSubComponentUI(aColumn.getCellRenderer());
62. updateSubComponentUI(aColumn.getCellEditor());
63. updateSubComponentUI(aColumn.getHeaderRenderer());
64. }
66. // Update the UIs of all the default renderers.
67. Enumeration defaultRenderers = defaultRenderersByColumnClass.elements();
68. while (defaultRenderers.hasMoreElements()) {
69. updateSubComponentUI(defaultRenderers.nextElement());
70. }
72. // Update the UIs of all the default editors.
73. Enumeration defaultEditors = defaultEditorsByColumnClass.elements();
74. while (defaultEditors.hasMoreElements()) {
75. updateSubComponentUI(defaultEditors.nextElement());
76. }
78. // Update the UI of the table header
79. if (tableHeader != null && tableHeader.getParent() == null) {
80. tableHeader.updateUI();
81. }
82. setUI(new GridBagTableUI());
83. }
85. public Rectangle getGridCellRect(int row, int column, boolean includeSpacing){
86. return super.getCellRect(row, column, includeSpacing);
87. }
89. public Rectangle getCellRect(int row, int column, boolean includeSpacing) {
90. Rectangle cellRect = super.getCellRect(row, column, includeSpacing);
91. int cols = gridBagModel.getColumnGrid(row, column);
92. TableColumnModel cm = getColumnModel();
93. for( int n=1; n
94. cellRect.width += cm.getColumn(column+n).getWidth();
95. int rows = gridBagModel.getRowGrid(row, column);
96. for( int n=1; n
97. cellRect.height += getRowHeight(row+n);
98. return cellRect;
99. }
101. public void tableChanged(TableModelEvent e){
102. super.tableChanged(e);
103. //TODO
104. }
106. public boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn){
107. if( gridBagModel.mergeCells(startRow, endRow, startColumn, endColumn)){
108. repaint();
109. return true;
110. }
111. return false;
112. }
114. public boolean mergeCells(int[] rows, int[] columns){
115. if( gridBagModel.mergeCells(rows, columns)){
116. repaint();
117. return true;
118. }
119. return false;
120. }
122. public boolean spliteCellAt(int row, int column){
123. if( gridBagModel.spliteCellAt(row, column)){
124. repaint();
125. return true;
126. }
127. return false;
128. }
130. public void changeSelection(int rowIndex, int columnIndex, boolean toggle, boolean extend) {
131. if( gridBagModel.getCellState( rowIndex , columnIndex ) != GridBagModel.COVERED )
132. super.changeSelection(rowIndex, columnIndex, toggle, extend);
133. Point p;
134. for( int row = rowIndex; row >= 0; row-- ){
135. for( int col = columnIndex; col >= 0; col-- ){
136. p = gridBagModel.getGrid(row, col);
137. //p = ((Point)((Vector)rowVector.get(row)).get(col));
138. if( col + p.x > columnIndex && row + p.y > rowIndex){
139. rowIndex = row;
140. columnIndex = col;
141. break;
142. }
143. }
144. }
145. super.changeSelection(rowIndex, columnIndex, toggle, extend);
146. repaint();
147. }
149. public boolean editCellAt(int rowIndex, int columnIndex, EventObject e){
150. if( gridBagModel.getCellState( rowIndex , columnIndex ) != GridBagModel.COVERED )
151. return super.editCellAt(rowIndex, columnIndex, e);
152. Point p;
153. for( int row = rowIndex; row >= 0; row-- ){
154. for( int col = columnIndex; col >= 0; col-- ){
155. p = gridBagModel.getGrid(row, col);
156. if( col + p.x > columnIndex && row + p.y > rowIndex){
157. rowIndex = row;
158. columnIndex = col;
159. break;
160. }
161. }
162. }
163. return super.editCellAt(rowIndex, columnIndex, e);
164. }
165. }
```
package org.dxj.guitools.gridbagtable;
import java.awt.Component;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.Enumeration;
import java.util.EventObject;

import javax.swing.DefaultCellEditor;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.event.TableModelEvent;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

/**
 * @author [email protected]
 */
public class GridBagTable extends JTable{

	GridBagModel gridBagModel;
	
	public GridBagModel getGridBagModel() {
		return gridBagModel;
	}
	
	public void setGridBagModel(GridBagModel gridBagModel){
		if( gridBagModel != null && gridBagModel != this.gridBagModel )
			this.gridBagModel = gridBagModel;
	}

	public GridBagTable(AbstractTableModel dm){
		super(dm);		
		getTableHeader().setReorderingAllowed(false);
		gridBagModel = new DefaultGridBagTableModel(dm);		
		getColumnModel().setColumnSelectionAllowed(true);
	}
	
	 private void updateSubComponentUI(Object componentShell) {
        if (componentShell == null) {
            return;
        }
        Component component = null;
        if (componentShell instanceof Component) {
            component = (Component)componentShell;
        }
        if (componentShell instanceof DefaultCellEditor) {
            component = ((DefaultCellEditor)componentShell).getComponent();
        }

        if (component != null) {
            SwingUtilities.updateComponentTreeUI(component);
        }
    }
	
	public void updateUI() {	
        // Update the UIs of the cell renderers, cell editors and header renderers.
        TableColumnModel cm = getColumnModel();
        for(int column = 0; column < cm.getColumnCount(); column++) {
            TableColumn aColumn = cm.getColumn(column);
	    updateSubComponentUI(aColumn.getCellRenderer());
            updateSubComponentUI(aColumn.getCellEditor());
	    updateSubComponentUI(aColumn.getHeaderRenderer());
        }

        // Update the UIs of all the default renderers.
        Enumeration defaultRenderers = defaultRenderersByColumnClass.elements();
        while (defaultRenderers.hasMoreElements()) {
            updateSubComponentUI(defaultRenderers.nextElement());
        }

        // Update the UIs of all the default editors.
        Enumeration defaultEditors = defaultEditorsByColumnClass.elements();
        while (defaultEditors.hasMoreElements()) {
            updateSubComponentUI(defaultEditors.nextElement());
        }

        // Update the UI of the table header
        if (tableHeader != null && tableHeader.getParent() == null) {
            tableHeader.updateUI();
        }
        setUI(new GridBagTableUI());
    }
	
	public Rectangle getGridCellRect(int row, int column, boolean includeSpacing){
		return super.getCellRect(row, column, includeSpacing);
	}
	
	public Rectangle getCellRect(int row, int column, boolean includeSpacing) {		
		Rectangle cellRect = super.getCellRect(row, column, includeSpacing);
		int cols = gridBagModel.getColumnGrid(row, column);
		TableColumnModel cm = getColumnModel();
		for( int n=1; n= 0; row-- ){
			for( int col = columnIndex; col >= 0; col-- ){
				p = gridBagModel.getGrid(row, col);
				//p = ((Point)((Vector)rowVector.get(row)).get(col));
				if( col + p.x > columnIndex && row + p.y > rowIndex){
					rowIndex = row;
					columnIndex = col;
					break;
				}
    		}
		}  	
    	super.changeSelection(rowIndex, columnIndex, toggle, extend);
    	repaint();
    }
    
    public boolean editCellAt(int rowIndex, int columnIndex, EventObject e){
    	if( gridBagModel.getCellState( rowIndex , columnIndex ) != GridBagModel.COVERED  )
    		return super.editCellAt(rowIndex, columnIndex, e);   
		Point p;
		for( int row = rowIndex; row >= 0; row-- ){
			for( int col = columnIndex; col >= 0; col-- ){
				p = gridBagModel.getGrid(row, col);
				if( col + p.x > columnIndex && row + p.y > rowIndex){
					rowIndex = row;
					columnIndex = col;
					break;
				}
    		}
		}   	
    	return super.editCellAt(rowIndex, columnIndex, e);        
    }
}
```
Java代码
1. package org.dxj.guitools.gridbagtable;
3. import java.awt.Point;
5. public interface GridBagModel {
6. //格子处于正常状态
7. int DEFAULT = 0;
8. //格子合并了其他的格子
9. int MERGE = 1;
10. //格子被其他格子合并
11. int COVERED = -1;
13. /**
14. * @param row 行
15. * @param column 列
16. * @return 该单元格在行、列的跨度
17. */
18. Point getGrid(int row, int column);
20. /**
21. * 在Y轴方向的跨度
22. * @param row
23. * @param column
24. * @return
25. */
26. int getRowGrid(int row, int column);
28. /**
29. * 在X轴方向的跨度
30. * @param row
31. * @param column
32. * @return
33. */
34. int getColumnGrid(int row, int column);
36. /**
37. * @param rows 行集合
38. * @param columns 列集合
39. * @return 单元格集合是否可以合并在一起
40. */
41. boolean canMergeCells(int[] rows, int[] columns);
43. /**
44. * 判断该单元格状态
45. * @param row
46. * @param column
47. * @return MERGE|DEFAULT|COVERED
48. */
49. int getCellState(int row, int column);
51. /**
52. * 将单元格集合合并
53. * @param startRow 开始行
54. * @param endRow 结束行
55. * @param startColumn 开始列
56. * @param endColumn 结束列
57. * @return 是否合并成功
58. */
59. boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn);
61. /**
62. * 将单元格集合合并
63. * @param rows 行集合
64. * @param columns 列集合
65. * @return 是否合并成功
66. */
67. boolean mergeCells(int[] rows, int[] columns);
69. /**
70. * 拆分单元格
71. * @param row 行
72. * @param column 列
73. * @return 是否拆分成功
74. */
75. boolean spliteCellAt(int row, int column);
77. /**
78. * 清除所有合并
79. */
80. void clearMergence();
81. }
```
package org.dxj.guitools.gridbagtable;

import java.awt.Point;

public interface GridBagModel {
	//格子处于正常状态
	int DEFAULT = 0;
	//格子合并了其他的格子
	int MERGE = 1;
	//格子被其他格子合并
	int COVERED = -1;
	
	/**
	 * @param row 行
	 * @param column 列
	 * @return 该单元格在行、列的跨度
	 */
	Point getGrid(int row, int column);
	
	/**
	 * 在Y轴方向的跨度
	 * @param row
	 * @param column
	 * @return
	 */
	int getRowGrid(int row, int column);
	
	/**
	 * 在X轴方向的跨度
	 * @param row
	 * @param column
	 * @return
	 */
	int getColumnGrid(int row, int column);

	/**
	 * @param rows 行集合
	 * @param columns 列集合
	 * @return 单元格集合是否可以合并在一起
	 */
	boolean canMergeCells(int[] rows, int[] columns);
	
	/**
	 * 判断该单元格状态
	 * @param row
	 * @param column
	 * @return MERGE|DEFAULT|COVERED
	 */
	int getCellState(int row, int column);
	
	/**
	 * 将单元格集合合并
	 * @param startRow 开始行
	 * @param endRow 结束行
	 * @param startColumn 开始列
	 * @param endColumn 结束列
	 * @return 是否合并成功
	 */
	boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn);
	
	/**
	 * 将单元格集合合并
	 * @param rows 行集合
	 * @param columns 列集合
	 * @return 是否合并成功
	 */
	boolean mergeCells(int[] rows, int[] columns);
	
	/**
	 * 拆分单元格
	 * @param row 行
	 * @param column 列
	 * @return 是否拆分成功
	 */
	boolean spliteCellAt(int row, int column);
	
	/**
	 * 清除 所有合并
	 */
	void clearMergence();
}
```
Java代码
1. package org.dxj.guitools.gridbagtable;
3. import java.awt.Point;
4. import java.util.Arrays;
5. import java.util.List;
6. import java.util.Vector;
8. import javax.swing.event.TableModelEvent;
9. import javax.swing.event.TableModelListener;
10. import javax.swing.table.AbstractTableModel;
12. public class DefaultGridBagTableModel implements GridBagModel, TableModelListener{
13. protected AbstractTableModel model;
14. protected List> gridInfo;
16. DefaultGridBagTableModel(AbstractTableModel model){
17. gridInfo = new Vector>();
18. setTableModel(model);
19. }
21. public void setTableModel(AbstractTableModel model){
22. if( model != null && model != this.model ){
23. if( this.model != null )
24. this.model.removeTableModelListener(this);
25. //防止多次添加监听器
26. model.removeTableModelListener(this);
27. model.addTableModelListener(this);
28. this.model = model;
29. clearMergence();
30. }
31. }
33. public void clearMergence(){
34. if( gridInfo == null )
35. gridInfo = new Vector>();
36. else
37. gridInfo.clear();
39. if( model == null )
40. return;
42. //初始化，每个格子占的格子数为(1,1);
43. for(int row=model.getRowCount(); --row>=0;){
44. List infos = new Vector();
45. gridInfo.add(infos);
46. for(int col=model.getColumnCount(); --col>=0;){
47. infos.add(getDefaultPoint());
48. }
49. }
50. }
52. public Point getDefaultPoint(){
53. return new Point(1,1);
54. }
56. @Override
57. public boolean canMergeCells(int[] rows, int[] columns) {
58. if( rows == null || columns == null ) return false;
59. Arrays.sort(rows);
60. for(int index=0; index1; index++){
61. if( rows[index+1] - rows[index] > 1 )
62. return false;
63. }
64. Arrays.sort(columns);
65. for(int index=0; index1; index++){
66. if( columns[index+1] - columns[index] > 1 )
67. return false;
68. }
69. return true;
70. }
72. @Override
73. public int getCellState(int row, int column) {
74. Point grid = getGrid(row, column);
75. if( grid == null ) return DEFAULT;
76. if( grid.x>1 || grid.y>1 )
77. return MERGE;
78. if( grid.x<=0 || grid.y<=0 )
79. return COVERED;
80. return DEFAULT;
81. }
83. @Override
84. public int getColumnGrid(int row, int column) {
85. if( gridInfo != null && row >=0 && row < gridInfo.size() ){
86. List gridRow = gridInfo.get(row);
87. if( gridRow != null && column >=0 && column < gridRow.size() ){
88. Point point = gridRow.get(column);
89. if( point != null )
90. return point.x;
91. }
92. }
93. return 1;
94. }
96. @Override
97. public Point getGrid(int row, int column) {
98. if( gridInfo != null && row >=0 && row < gridInfo.size() ){
99. List gridRow = gridInfo.get(row);
100. if( gridRow != null && column >=0 && column < gridRow.size() ){
101. return gridRow.get(column);
102. }
103. }
104. return getDefaultPoint();
105. }
107. @Override
108. public int getRowGrid(int row, int column) {
109. if( gridInfo != null && row >=0 && row < gridInfo.size() ){
110. List gridRow = gridInfo.get(row);
111. if( gridRow != null && column >=0 && column < gridRow.size() ){
112. Point point = gridRow.get(column);
113. if( point != null )
114. return point.y;
115. }
116. }
117. return 1;
118. }
120. protected boolean setGrid(int row, int column, Point grid) {
121. if( gridInfo != null && row >=0 && row < gridInfo.size() ){
122. List gridRow = gridInfo.get(row);
123. if( gridRow != null && column >=0 && column < gridRow.size() ){
124. Point point = gridRow.get(column);
125. if( point != null ){
126. point.setLocation(grid);
127. }
128. else{
129. gridRow.set(column, grid.getLocation());
130. }
131. return true;
132. }
133. }
134. return false;
135. }
137. @Override
138. public boolean spliteCellAt(int row, int column) {
139. if( gridInfo != null && row >=0 && row < gridInfo.size() ){
140. List gridRow = gridInfo.get(row);
141. if( gridRow != null && column >=0 && column < gridRow.size() ){
142. Point point = gridRow.get(column);
143. if( point != null ){
144. point = point.getLocation();
145. for(int a=0; a
146. for(int b=0; b
147. setGrid(row+a, column+b, getDefaultPoint());
148. }
149. }
150. }
151. else{
152. gridRow.set(column, getDefaultPoint());
153. }
154. return true;
155. }
156. }
157. return false;
158. }
160. @Override
161. /**
162. * table中发生行的添加和删除的时候需要修改该模型
163. */
164. public void tableChanged(TableModelEvent e) {
165. //TODO
166. }
168. @Override
169. public boolean mergeCells(int[] rows, int[] columns) {
170. if( !canMergeCells(rows, columns) )
171. return false;
172. Arrays.sort(rows);
173. Arrays.sort(columns);
174. return mergeCells(rows[0],rows[rows.length-1],columns[0],columns[columns.length-1]);
175. }
177. @Override
178. public boolean mergeCells(int startRow, int endRow, int startColumn, int endColumn) {
179. setGrid(startRow, startColumn, new Point(endColumn-startColumn+1, endRow-startRow+1));
180. for(int row=startRow; row<=endRow; row++){
181. for(int col=startColumn; col<=endColumn; col++){
182. if(row==startRow&&col==startColumn)
183. continue;
184. else
185. setGrid(row, col, new Point(COVERED,COVERED));
186. }
187. }
188. return true;
189. }
191. public String toString(){
192. if( gridInfo == null )
193. return "";
194. StringBuffer sb = new StringBuffer();
195. for(List rowInfo : gridInfo ){
196. for(Point grid : rowInfo){
197. sb.append("["+grid.x+","+grid.y+"], ");
198. }
199. sb.append("\n");
200. }
201. return sb.toString();
202. }
203. }
```
package org.dxj.guitools.gridbagtable;

import java.awt.Point;
import java.util.Arrays;
import java.util.List;
import java.util.Vector;

import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;

public class DefaultGridBagTableModel implements GridBagModel, TableModelListener{
	protected AbstractTableModel model;
	protected List> gridInfo;
	
	DefaultGridBagTableModel(AbstractTableModel model){
		gridInfo = new Vector>();
		setTableModel(model);
	}
	
	public void setTableModel(AbstractTableModel model){
		if( model != null && model != this.model ){
			if( this.model != null )
				this.model.removeTableModelListener(this);
			//防止多次添加监听器
			model.removeTableModelListener(this);
			model.addTableModelListener(this);
			this.model = model;
			clearMergence();
		}
	}
	
	public void clearMergence(){
		if( gridInfo == null  )
			gridInfo = new Vector>();
		else
			gridInfo.clear();
		
		if( model == null )
			return;
		
		//初始化，每个格子占的格子数为(1,1);
		for(int row=model.getRowCount(); --row>=0;){
			List infos = new Vector();
			gridInfo.add(infos);
			for(int col=model.getColumnCount(); --col>=0;){
				infos.add(getDefaultPoint());
			}
		}
	}
	
	public Point getDefaultPoint(){
		return new Point(1,1);
	}
	
	@Override
	public boolean canMergeCells(int[] rows, int[] columns) {
		if( rows == null || columns == null ) return false;
		Arrays.sort(rows);
		for(int index=0; index 1 )
				return false;
		}
		Arrays.sort(columns);
		for(int index=0; index 1 )
				return false;
		}
		return true;
	}
	
	@Override
	public int getCellState(int row, int column) {
		Point grid = getGrid(row, column);
		if( grid == null ) return DEFAULT;
		if( grid.x>1 || grid.y>1 )
			return MERGE;
		if( grid.x<=0 || grid.y<=0 )
			return COVERED;
		return DEFAULT;
	}

	@Override
	public int getColumnGrid(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null )
					return point.x;
			}	
		}
		return 1;
	}

	@Override
	public Point getGrid(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				return gridRow.get(column);
			}	
		}
		return getDefaultPoint();
	}

	@Override
	public int getRowGrid(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null )
					return point.y;
			}	
		}
		return 1;
	}

	protected boolean setGrid(int row, int column, Point grid) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null ){
					point.setLocation(grid);
				}
				else{
					gridRow.set(column, grid.getLocation());
				}
				return true;
			}	
		}
		return false;
	}

	@Override
	public boolean spliteCellAt(int row, int column) {
		if( gridInfo != null && row >=0 && row < gridInfo.size() ){
			List gridRow = gridInfo.get(row);
			if( gridRow != null && column >=0 && column < gridRow.size() ){
				Point point = gridRow.get(column);
				if( point != null ){
					point = point.getLocation();
					for(int a=0; a rowInfo : gridInfo ){
			for(Point grid : rowInfo){
				sb.append("["+grid.x+","+grid.y+"], ");
			}
			sb.append("\n");
		}
		return sb.toString();
	}
}
```
Java代码
1. package org.dxj.guitools.gridbagtable;
3. import java.awt.Color;
4. import java.awt.Component;
5. import java.awt.Dimension;
6. import java.awt.Graphics;
7. import java.awt.Point;
8. import java.awt.Rectangle;
9. import java.util.Enumeration;
11. import javax.swing.BorderFactory;
12. import javax.swing.JComponent;
13. import javax.swing.JTable;
14. import javax.swing.UIManager;
15. import javax.swing.plaf.basic.BasicTableUI;
16. import javax.swing.table.JTableHeader;
17. import javax.swing.table.TableCellRenderer;
18. import javax.swing.table.TableColumn;
19. import javax.swing.table.TableColumnModel;
21. public class GridBagTableUI extends BasicTableUI
22. {
23. public Dimension getPreferredSize(JComponent c) {
24. long width = 0;
25. Enumeration enumeration = table.getColumnModel().getColumns();
26. while (enumeration.hasMoreElements()) {
27. TableColumn aColumn = (TableColumn)enumeration.nextElement();
28. width = width + aColumn.getPreferredWidth();
29. }
30. return createTableSize(width);
31. }
33. private Dimension createTableSize(long width) {
34. int height = 0;
35. int rowCount = table.getRowCount();
36. if (rowCount > 0 && table.getColumnCount() > 0) {
37. Rectangle r = table.getCellRect(rowCount-1, 0, true);
38. height = r.y + r.height;
39. }
40. // Width is always positive. The call to abs() is a workaround for
41. // a bug in the 1.1.6 JIT on Windows.
42. long tmp = Math.abs(width);
43. if (tmp > Integer.MAX_VALUE) {
44. tmp = Integer.MAX_VALUE;
45. }
46. return new Dimension((int)tmp, height);
47. }
49. public void paint(Graphics g, JComponent c) {
50. Rectangle clip = g.getClipBounds();
52. Rectangle bounds = table.getBounds();
53. // account for the fact that the graphics has already been translated
54. // into the table's bounds
55. bounds.x = bounds.y = 0;
57. if (table.getRowCount() <= 0 || table.getColumnCount() <= 0 ||
58. // this check prevents us from painting the entire table
59. // when the clip doesn't intersect our bounds at all
60. !bounds.intersects(clip)) {
62. paintDropLines(g);
63. return;
64. }
66. boolean ltr = table.getComponentOrientation().isLeftToRight();
68. Point upperLeft = clip.getLocation();
69. if (!ltr) {
70. upperLeft.x++;
71. }
73. Point lowerRight = new Point(clip.x + clip.width - (ltr ? 1 : 0),
74. clip.y + clip.height);
76. int rMin = table.rowAtPoint(upperLeft);
77. int rMax = table.rowAtPoint(lowerRight);
78. // This should never happen (as long as our bounds intersect the clip,
79. // which is why we bail above if that is the case).
80. if (rMin == -1) {
81. rMin = 0;
82. }
83. // If the table does not have enough rows to fill the view we'll get -1.
84. // (We could also get -1 if our bounds don't intersect the clip,
85. // which is why we bail above if that is the case).
86. // Replace this with the index of the last row.
87. if (rMax == -1) {
88. rMax = table.getRowCount()-1;
89. }
91. int cMin = table.columnAtPoint(ltr ? upperLeft : lowerRight);
92. int cMax = table.columnAtPoint(ltr ? lowerRight : upperLeft);
93. // This should never happen.
94. if (cMin == -1) {
95. cMin = 0;
96. }
97. // If the table does not have enough columns to fill the view we'll get -1.
98. // Replace this with the index of the last column.
99. if (cMax == -1) {
100. cMax = table.getColumnCount()-1;
101. }
103. // Paint the grid.
104. //paintGrid(g, rMin, rMax, cMin, cMax);
106. // Paint the cells.
107. paintCells(g, rMin, rMax, cMin, cMax);
109. paintDropLines(g);
110. }
112. private void paintDropLines(Graphics g) {
113. JTable.DropLocation loc = table.getDropLocation();
114. if (loc == null) {
115. return;
116. }
118. Color color = UIManager.getColor("Table.dropLineColor");
119. Color shortColor = UIManager.getColor("Table.dropLineShortColor");
120. if (color == null && shortColor == null) {
121. return;
122. }
124. Rectangle rect;
126. rect = getHDropLineRect(loc);
127. if (rect != null) {
128. int x = rect.x;
129. int w = rect.width;
130. if (color != null) {
131. extendRect(rect, true);
132. g.setColor(color);
133. g.fillRect(rect.x, rect.y, rect.width, rect.height);
134. }
135. if (!loc.isInsertColumn() && shortColor != null) {
136. g.setColor(shortColor);
137. g.fillRect(x, rect.y, w, rect.height);
138. }
139. }
141. rect = getVDropLineRect(loc);
142. if (rect != null) {
143. int y = rect.y;
144. int h = rect.height;
145. if (color != null) {
146. extendRect(rect, false);
147. g.setColor(color);
148. g.fillRect(rect.x, rect.y, rect.width, rect.height);
149. }
150. if (!loc.isInsertRow() && shortColor != null) {
151. g.setColor(shortColor);
152. g.fillRect(rect.x, y, rect.width, h);
153. }
154. }
155. }
157. /*
158. * Paints the grid lines within aRect, using the grid
159. * color set with setGridColor. Paints vertical lines
160. * if getShowVerticalLines() returns true and paints
161. * horizontal lines if getShowHorizontalLines()
162. * returns true.
163. */
164. private void paintGrid(Graphics g, int rMin, int rMax, int cMin, int cMax) {
165. g.setColor(table.getGridColor());
167. Rectangle minCell = table.getCellRect(rMin, cMin, true);
168. Rectangle maxCell = table.getCellRect(rMax, cMax, true);
169. Rectangle damagedArea = minCell.union( maxCell );
171. if (table.getShowHorizontalLines()) {
172. int tableWidth = damagedArea.x + damagedArea.width;
173. int y = damagedArea.y;
174. for (int row = rMin; row <= rMax; row++) {
175. y += table.getRowHeight(row);
176. g.drawLine(damagedArea.x, y - 1, tableWidth - 1, y - 1);
177. }
178. }
179. if (table.getShowVerticalLines()) {
180. TableColumnModel cm = table.getColumnModel();
181. int tableHeight = damagedArea.y + damagedArea.height;
182. int x;
183. if (table.getComponentOrientation().isLeftToRight()) {
184. x = damagedArea.x;
185. for (int column = cMin; column <= cMax; column++) {
186. int w = cm.getColumn(column).getWidth();
187. x += w;
188. g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
189. }
190. } else {
191. x = damagedArea.x;
192. for (int column = cMax; column >= cMin; column--) {
193. int w = cm.getColumn(column).getWidth();
194. x += w;
195. g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
196. }
197. }
198. }
199. }
201. private void paintCells(Graphics g, int rMin, int rMax, int cMin, int cMax) {
202. JTableHeader header = table.getTableHeader();
203. TableColumn draggedColumn = (header == null) ? null : header.getDraggedColumn();
205. TableColumnModel cm = table.getColumnModel();
206. int columnMargin = cm.getColumnMargin();
207. Rectangle cellRect;
208. TableColumn aColumn;
209. int columnWidth;
210. if (table.getComponentOrientation().isLeftToRight()) {
211. for(int row = rMin; row <= rMax; row++) {
212. if( table instanceof GridBagTable )
213. cellRect = ((GridBagTable)table).getGridCellRect(row, cMin, false);
214. else
215. cellRect = table.getCellRect(row, cMin, false);
216. for(int column = cMin; column <= cMax; column++) {
217. aColumn = cm.getColumn(column);
218. columnWidth = aColumn.getWidth();
219. //TODO
220. cellRect.width = columnWidth - columnMargin;
221. int oldHeight = cellRect.height;
222. if( table instanceof GridBagTable ){
223. if(((GridBagTable)table).getGridBagModel().getCellState( row, column) == GridBagModel.COVERED ) {
224. cellRect.width = 0;
225. cellRect.height = 0;
226. }
227. else{
228. int h = ((GridBagTable)table).getGridBagModel().getColumnGrid(row, column);
229. if( h >1 ){
230. for( int n=1; n
231. cellRect.width += cm.getColumn(column+n).getWidth();
232. }
233. int v = ((GridBagTable)table).getGridBagModel().getRowGrid(row, column);
234. if( v >1 ){
235. for( int n=1; n
236. cellRect.height += table.getRowHeight(row+n);
237. }
238. }
239. }
240. if (aColumn != draggedColumn) {
241. paintCell(g, cellRect, row, column);
242. }
243. cellRect.height = oldHeight;
244. cellRect.x += columnWidth;
245. }
246. }
247. } else {
248. for(int row = rMin; row <= rMax; row++) {
249. cellRect = table.getCellRect(row, cMin, false);
250. aColumn = cm.getColumn(cMin);
251. if (aColumn != draggedColumn) {
252. columnWidth = aColumn.getWidth();
253. cellRect.width = columnWidth - columnMargin;
254. paintCell(g, cellRect, row, cMin);
255. }
256. for(int column = cMin+1; column <= cMax; column++) {
257. aColumn = cm.getColumn(column);
258. columnWidth = aColumn.getWidth();
259. // TODO
260. cellRect.width = columnWidth - columnMargin;
261. cellRect.x -= columnWidth;
262. if (aColumn != draggedColumn) {
263. paintCell(g, cellRect, row, column);
264. }
265. }
266. }
267. }
269. // Paint the dragged column if we are dragging.
270. if (draggedColumn != null) {
271. paintDraggedArea(g, rMin, rMax, draggedColumn, header.getDraggedDistance());
272. }
274. // Remove any renderers that may be left in the rendererPane.
275. rendererPane.removeAll();
276. }
278. private void paintCell(Graphics g, Rectangle cellRect, int row, int column) {
279. if (table.isEditing() && table.getEditingRow()==row &&
280. table.getEditingColumn()==column) {
281. Component component = table.getEditorComponent();
282. component.setBounds(cellRect);
283. component.validate();
284. }
285. else {
286. TableCellRenderer renderer = table.getCellRenderer(row, column);
287. Component component = table.prepareRenderer(renderer, row, column);
289. if( component instanceof JComponent ){
290. ((JComponent)component).setBorder(BorderFactory.createLineBorder(Color.gray));
291. }
292. rendererPane.paintComponent(g, component, table, cellRect.x, cellRect.y,
293. cellRect.width, cellRect.height, true);
294. }
295. }
297. private Rectangle getHDropLineRect(JTable.DropLocation loc) {
298. if (!loc.isInsertRow()) {
299. return null;
300. }
302. int row = loc.getRow();
303. int col = loc.getColumn();
304. if (col >= table.getColumnCount()) {
305. col--;
306. }
308. Rectangle rect = table.getCellRect(row, col, true);
310. if (row >= table.getRowCount()) {
311. row--;
312. Rectangle prevRect = table.getCellRect(row, col, true);
313. rect.y = prevRect.y + prevRect.height;
314. }
316. if (rect.y == 0) {
317. rect.y = -1;
318. } else {
319. rect.y -= 2;
320. }
322. rect.height = 3;
324. return rect;
325. }
327. private void paintDraggedArea(Graphics g, int rMin, int rMax, TableColumn draggedColumn, int distance) {
328. int draggedColumnIndex = viewIndexForColumn(draggedColumn);
330. Rectangle minCell = table.getCellRect(rMin, draggedColumnIndex, true);
331. Rectangle maxCell = table.getCellRect(rMax, draggedColumnIndex, true);
333. Rectangle vacatedColumnRect = minCell.union(maxCell);
335. // Paint a gray well in place of the moving column.
336. g.setColor(table.getParent().getBackground());
337. g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
338. vacatedColumnRect.width, vacatedColumnRect.height);
340. // Move to the where the cell has been dragged.
341. vacatedColumnRect.x += distance;
343. // Fill the background.
344. g.setColor(table.getBackground());
345. g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
346. vacatedColumnRect.width, vacatedColumnRect.height);
348. // Paint the vertical grid lines if necessary.
349. if (table.getShowVerticalLines()) {
350. g.setColor(table.getGridColor());
351. int x1 = vacatedColumnRect.x;
352. int y1 = vacatedColumnRect.y;
353. int x2 = x1 + vacatedColumnRect.width - 1;
354. int y2 = y1 + vacatedColumnRect.height - 1;
355. // Left
356. g.drawLine(x1-1, y1, x1-1, y2);
357. // Right
358. g.drawLine(x2, y1, x2, y2);
359. }
361. for(int row = rMin; row <= rMax; row++) {
362. // Render the cell value
363. Rectangle r = table.getCellRect(row, draggedColumnIndex, false);
364. r.x += distance;
365. paintCell(g, r, row, draggedColumnIndex);
367. // Paint the (lower) horizontal grid line if necessary.
368. if (table.getShowHorizontalLines()) {
369. g.setColor(table.getGridColor());
370. Rectangle rcr = table.getCellRect(row, draggedColumnIndex, true);
371. rcr.x += distance;
372. int x1 = rcr.x;
373. int y1 = rcr.y;
374. int x2 = x1 + rcr.width - 1;
375. int y2 = y1 + rcr.height - 1;
376. g.drawLine(x1, y2, x2, y2);
377. }
378. }
379. }
381. private int viewIndexForColumn(TableColumn aColumn) {
382. TableColumnModel cm = table.getColumnModel();
383. for (int column = 0; column < cm.getColumnCount(); column++) {
384. if (cm.getColumn(column) == aColumn) {
385. return column;
386. }
387. }
388. return -1;
389. }
391. private Rectangle extendRect(Rectangle rect, boolean horizontal) {
392. if (rect == null) {
393. return rect;
394. }
396. if (horizontal) {
397. rect.x = 0;
398. rect.width = table.getWidth();
399. } else {
400. rect.y = 0;
402. if (table.getRowCount() != 0) {
403. Rectangle lastRect = table.getCellRect(table.getRowCount() - 1, 0, true);
404. rect.height = lastRect.y + lastRect.height;
405. } else {
406. rect.height = table.getHeight();
407. }
408. }
410. return rect;
411. }
413. private Rectangle getVDropLineRect(JTable.DropLocation loc) {
414. if (!loc.isInsertColumn()) {
415. return null;
416. }
418. boolean ltr = table.getComponentOrientation().isLeftToRight();
419. int col = loc.getColumn();
420. Rectangle rect = table.getCellRect(loc.getRow(), col, true);
422. if (col >= table.getColumnCount()) {
423. col--;
424. rect = table.getCellRect(loc.getRow(), col, true);
425. if (ltr) {
426. rect.x = rect.x + rect.width;
427. }
428. } else if (!ltr) {
429. rect.x = rect.x + rect.width;
430. }
432. if (rect.x == 0) {
433. rect.x = -1;
434. } else {
435. rect.x -= 2;
436. }
438. rect.width = 3;
440. return rect;
441. }
443. } // End of Class BasicTableUI
```
package org.dxj.guitools.gridbagtable;

import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.util.Enumeration;

import javax.swing.BorderFactory;
import javax.swing.JComponent;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.plaf.basic.BasicTableUI;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class GridBagTableUI extends BasicTableUI
{
    public Dimension getPreferredSize(JComponent c) {
        long width = 0;
        Enumeration enumeration = table.getColumnModel().getColumns();
        while (enumeration.hasMoreElements()) {
            TableColumn aColumn = (TableColumn)enumeration.nextElement();
            width = width + aColumn.getPreferredWidth();
        }
        return createTableSize(width);
    }
    
    private Dimension createTableSize(long width) {
    	int height = 0;
    	int rowCount = table.getRowCount();
    	if (rowCount > 0 && table.getColumnCount() > 0) {
    	    Rectangle r = table.getCellRect(rowCount-1, 0, true);
    	    height = r.y + r.height;
    	}
    	// Width is always positive. The call to abs() is a workaround for
    	// a bug in the 1.1.6 JIT on Windows.
    	long tmp = Math.abs(width);
            if (tmp > Integer.MAX_VALUE) {
                tmp = Integer.MAX_VALUE;
            }
    	return new Dimension((int)tmp, height);
        }
    
    public void paint(Graphics g, JComponent c) {
        Rectangle clip = g.getClipBounds();

        Rectangle bounds = table.getBounds();
        // account for the fact that the graphics has already been translated
        // into the table's bounds
        bounds.x = bounds.y = 0;

	if (table.getRowCount() <= 0 || table.getColumnCount() <= 0 ||
                // this check prevents us from painting the entire table
                // when the clip doesn't intersect our bounds at all
                !bounds.intersects(clip)) {

            paintDropLines(g);
	    return;
	}

        boolean ltr = table.getComponentOrientation().isLeftToRight();

	Point upperLeft = clip.getLocation();
        if (!ltr) {
            upperLeft.x++;
        }

	Point lowerRight = new Point(clip.x + clip.width - (ltr ? 1 : 0),
                                     clip.y + clip.height);

        int rMin = table.rowAtPoint(upperLeft);
        int rMax = table.rowAtPoint(lowerRight);
        // This should never happen (as long as our bounds intersect the clip,
        // which is why we bail above if that is the case).
        if (rMin == -1) {
	    rMin = 0;
        }
        // If the table does not have enough rows to fill the view we'll get -1.
        // (We could also get -1 if our bounds don't intersect the clip,
        // which is why we bail above if that is the case).
        // Replace this with the index of the last row.
        if (rMax == -1) {
	    rMax = table.getRowCount()-1;
        }

        int cMin = table.columnAtPoint(ltr ? upperLeft : lowerRight); 
        int cMax = table.columnAtPoint(ltr ? lowerRight : upperLeft);        
        // This should never happen.
        if (cMin == -1) {
	    cMin = 0;
        }
	// If the table does not have enough columns to fill the view we'll get -1.
        // Replace this with the index of the last column.
        if (cMax == -1) {
	    cMax = table.getColumnCount()-1;
        }

        // Paint the grid.
        //paintGrid(g, rMin, rMax, cMin, cMax);

        // Paint the cells.
	paintCells(g, rMin, rMax, cMin, cMax);

        paintDropLines(g);
    }
    
    private void paintDropLines(Graphics g) {
        JTable.DropLocation loc = table.getDropLocation();
        if (loc == null) {
            return;
        }

        Color color = UIManager.getColor("Table.dropLineColor");
        Color shortColor = UIManager.getColor("Table.dropLineShortColor");
        if (color == null && shortColor == null) {
            return;
        }

        Rectangle rect;

        rect = getHDropLineRect(loc);
        if (rect != null) {
            int x = rect.x;
            int w = rect.width;
            if (color != null) {
                extendRect(rect, true);
                g.setColor(color);
                g.fillRect(rect.x, rect.y, rect.width, rect.height);
            }
            if (!loc.isInsertColumn() && shortColor != null) {
                g.setColor(shortColor);
                g.fillRect(x, rect.y, w, rect.height);
            }
        }

        rect = getVDropLineRect(loc);
        if (rect != null) {
            int y = rect.y;
            int h = rect.height;
            if (color != null) {
                extendRect(rect, false);
                g.setColor(color);
                g.fillRect(rect.x, rect.y, rect.width, rect.height);
            }
            if (!loc.isInsertRow() && shortColor != null) {
                g.setColor(shortColor);
                g.fillRect(rect.x, y, rect.width, h);
            }
        }
    }
    
    /*
     * Paints the grid lines within aRect, using the grid
     * color set with setGridColor. Paints vertical lines
     * if getShowVerticalLines() returns true and paints
     * horizontal lines if getShowHorizontalLines()
     * returns true.
     */
    private void paintGrid(Graphics g, int rMin, int rMax, int cMin, int cMax) {
        g.setColor(table.getGridColor());

        Rectangle minCell = table.getCellRect(rMin, cMin, true);
        Rectangle maxCell = table.getCellRect(rMax, cMax, true);
        Rectangle damagedArea = minCell.union( maxCell );

		if (table.getShowHorizontalLines()) {
			int tableWidth = damagedArea.x + damagedArea.width;
			int y = damagedArea.y;
			for (int row = rMin; row <= rMax; row++) {
				y += table.getRowHeight(row);
				g.drawLine(damagedArea.x, y - 1, tableWidth - 1, y - 1);
			}
		}
		if (table.getShowVerticalLines()) {
			TableColumnModel cm = table.getColumnModel();
			int tableHeight = damagedArea.y + damagedArea.height;
			int x;
			if (table.getComponentOrientation().isLeftToRight()) {
				x = damagedArea.x;
				for (int column = cMin; column <= cMax; column++) {
					int w = cm.getColumn(column).getWidth();
					x += w;
					g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
				}
			} else {
				x = damagedArea.x;
				for (int column = cMax; column >= cMin; column--) {
					int w = cm.getColumn(column).getWidth();
					x += w;
					g.drawLine(x - 1, 0, x - 1, tableHeight - 1);
				}
			}
		}
    }
    
    private void paintCells(Graphics g, int rMin, int rMax, int cMin, int cMax) {
    	JTableHeader header = table.getTableHeader();
    	TableColumn draggedColumn = (header == null) ? null : header.getDraggedColumn();

    	TableColumnModel cm = table.getColumnModel();
    	int columnMargin = cm.getColumnMargin();
            Rectangle cellRect;
    	TableColumn aColumn;
    	int columnWidth;
    	if (table.getComponentOrientation().isLeftToRight()) {
    	    for(int row = rMin; row <= rMax; row++) {
    	    	if( table instanceof GridBagTable )
    	    		cellRect = ((GridBagTable)table).getGridCellRect(row, cMin, false);
    	    	else
    	    		cellRect = table.getCellRect(row, cMin, false);
                for(int column = cMin; column <= cMax; column++) {
                    aColumn = cm.getColumn(column);
                    columnWidth = aColumn.getWidth();                                 
                    //TODO
                    cellRect.width = columnWidth - columnMargin;
                    int oldHeight = cellRect.height;
                    if( table instanceof GridBagTable ){
                    	if(((GridBagTable)table).getGridBagModel().getCellState( row, column) == GridBagModel.COVERED ) {
                        	cellRect.width = 0;
                        	cellRect.height = 0;
                        }
                    	else{
                    		int h = ((GridBagTable)table).getGridBagModel().getColumnGrid(row, column);
                        	if( h >1 ){
                        		for( int n=1; n1 ){
                        		for( int n=1; n= table.getColumnCount()) {
            col--;
        }

        Rectangle rect = table.getCellRect(row, col, true);

        if (row >= table.getRowCount()) {
            row--;
            Rectangle prevRect = table.getCellRect(row, col, true);
            rect.y = prevRect.y + prevRect.height;
        }

        if (rect.y == 0) {
            rect.y = -1;
        } else {
            rect.y -= 2;
        }

        rect.height = 3;

        return rect;
    }
    
    private void paintDraggedArea(Graphics g, int rMin, int rMax, TableColumn draggedColumn, int distance) {
        int draggedColumnIndex = viewIndexForColumn(draggedColumn);

        Rectangle minCell = table.getCellRect(rMin, draggedColumnIndex, true);
	Rectangle maxCell = table.getCellRect(rMax, draggedColumnIndex, true);

	Rectangle vacatedColumnRect = minCell.union(maxCell);

	// Paint a gray well in place of the moving column.
	g.setColor(table.getParent().getBackground());
	g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
		   vacatedColumnRect.width, vacatedColumnRect.height);

	// Move to the where the cell has been dragged.
	vacatedColumnRect.x += distance;

	// Fill the background.
	g.setColor(table.getBackground());
	g.fillRect(vacatedColumnRect.x, vacatedColumnRect.y,
		   vacatedColumnRect.width, vacatedColumnRect.height);

	// Paint the vertical grid lines if necessary.
	if (table.getShowVerticalLines()) {
	    g.setColor(table.getGridColor());
	    int x1 = vacatedColumnRect.x;
	    int y1 = vacatedColumnRect.y;
	    int x2 = x1 + vacatedColumnRect.width - 1;
	    int y2 = y1 + vacatedColumnRect.height - 1;
	    // Left
	    g.drawLine(x1-1, y1, x1-1, y2);
	    // Right
	    g.drawLine(x2, y1, x2, y2);
	}

	for(int row = rMin; row <= rMax; row++) {
	    // Render the cell value
	    Rectangle r = table.getCellRect(row, draggedColumnIndex, false);
	    r.x += distance;
	    paintCell(g, r, row, draggedColumnIndex);

	    // Paint the (lower) horizontal grid line if necessary.
	    if (table.getShowHorizontalLines()) {
		g.setColor(table.getGridColor());
		Rectangle rcr = table.getCellRect(row, draggedColumnIndex, true);
		rcr.x += distance;
		int x1 = rcr.x;
		int y1 = rcr.y;
		int x2 = x1 + rcr.width - 1;
		int y2 = y1 + rcr.height - 1;
		g.drawLine(x1, y2, x2, y2);
	    }
	}
    }
    
    private int viewIndexForColumn(TableColumn aColumn) {
        TableColumnModel cm = table.getColumnModel();
        for (int column = 0; column < cm.getColumnCount(); column++) {
            if (cm.getColumn(column) == aColumn) {
                return column;
            }
        }
        return -1;
    }
    
    private Rectangle extendRect(Rectangle rect, boolean horizontal) {
        if (rect == null) {
            return rect;
        }

        if (horizontal) {
            rect.x = 0;
            rect.width = table.getWidth();
        } else {
            rect.y = 0;

            if (table.getRowCount() != 0) {
                Rectangle lastRect = table.getCellRect(table.getRowCount() - 1, 0, true);
                rect.height = lastRect.y + lastRect.height;
            } else {
                rect.height = table.getHeight();
            }
        }

        return rect;
    }
    
    private Rectangle getVDropLineRect(JTable.DropLocation loc) {
        if (!loc.isInsertColumn()) {
            return null;
        }

        boolean ltr = table.getComponentOrientation().isLeftToRight();
        int col = loc.getColumn();
        Rectangle rect = table.getCellRect(loc.getRow(), col, true);

        if (col >= table.getColumnCount()) {
            col--;
            rect = table.getCellRect(loc.getRow(), col, true);
            if (ltr) {
                rect.x = rect.x + rect.width;
            }
        } else if (!ltr) {
            rect.x = rect.x + rect.width;
        }

        if (rect.x == 0) {
            rect.x = -1;
        } else {
            rect.x -= 2;
        }
        
        rect.width = 3;

        return rect;
    }

}  // End of Class BasicTableUI
```
测试代码：
Java代码
1. import java.awt.BorderLayout;
2. import java.awt.event.ActionEvent;
3. import java.awt.event.ActionListener;
5. import javax.swing.JButton;
6. import javax.swing.JFrame;
7. import javax.swing.JScrollPane;
8. import javax.swing.table.DefaultTableModel;
10. import com.jrf.jgrid.guitools.gridbagtable.GridBagTable;
13. public class Test implements ActionListener{
15. GridBagTable table;
16. public Test()
17. {
18. JFrame d = new JFrame();
19. DefaultTableModel model = new DefaultTableModel(5,5);
21. table = new GridBagTable(model);
22. table.setRowHeight(20);
24. JScrollPane pane = new JScrollPane(table);
25. d.getContentPane().add(pane, BorderLayout.CENTER);
26. JButton btn = new JButton("合并/拆分");
27. d.getContentPane().add(btn, BorderLayout.NORTH);
28. btn.addActionListener(this);
29. d.setBounds(0, 0, 400, 400);
30. d.setVisible(true);
31. }
33. public static void main(String[] fsd){
34. new Test();
35. }
37. public void actionPerformed(ActionEvent e) {
38. table.mergeCells(table.getSelectedRows(), table.getSelectedColumns());
39. }
40. }

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