treeviewer的某列设置背景色

package com.test;

import java.io.File;

import org.eclipse.jface.viewers.CheckStateChangedEvent;
import org.eclipse.jface.viewers.CheckboxTreeViewer;
import org.eclipse.jface.viewers.ICheckStateListener;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TreeColumn;
import org.eclipse.swt.widgets.TreeItem;


public class TreeColumnTest {
   
    public void run(){
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
       
        final CheckboxTreeViewer viewer = new CheckboxTreeViewer(shell, SWT.FULL_SELECTION);
        viewer.getTree().setHeaderVisible(true);
        TreeColumn column = new TreeColumn(viewer.getTree(), SWT.LEFT);
        column.setText("Name");
        column.setWidth(200);
        column = new TreeColumn(viewer.getTree(), SWT.LEFT);
        column.setText("Size");
        column.setWidth(100);
        column = new TreeColumn(viewer.getTree(), SWT.LEFT);
        column.setText("Hidden");
        column.setWidth(100);
        viewer.setContentProvider(new MyTreeContenetProvider());
        viewer.setLabelProvider(new MyTableLableProvider());
        viewer.setInput(new File("/"));
       viewer.addCheckStateListener(new ICheckStateListener(){

@Override
public void checkStateChanged(CheckStateChangedEvent event) {
//获取所设置背景色的前几列的宽度，不包含本身
int width=viewer.getTree().getColumn(0).getWidth()+viewer.getTree().getColumn(1).getWidth();
System.out.println(width);
TreeItem treeItem=(TreeItem) viewer.testFindItem(event.getElement());
Point point=new Point(treeItem.getBounds().x+width,treeItem.getBounds().y);
ViewerCell viewercell=viewer.getCell(point);
viewercell.setBackground(new Color(Display.getDefault(),new RGB(255,255,0)));
}
      
       });
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }

    public static void main(String[] args) {
        new TreeColumnTest().run();
    }
   
    class MyTreeContenetProvider implements ITreeContentProvider{

        public Object[] getChildren(Object parentElement) {
            File file=(File)parentElement;
            if(file.isDirectory())
                return file.listFiles();
            else
                return null;
        }

        public Object getParent(Object element) {
            File file=(File)element;
            return file.getParentFile();
        }

        public boolean hasChildren(Object element) {
            File file=(File)element;
            return file.isDirectory()/*&&file.list().length>0*/;
        }

        public Object[] getElements(Object inputElement) {
            File file=(File)inputElement;
            return file.isDirectory()?file.listFiles():new Object[]{file};
        }

        public void dispose() {
           
        }

        public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
           
        }
       
    }
   
    class MyTableLableProvider implements ITableLabelProvider{

   
   
        public MyTableLableProvider() {
super();
//this.addListener(this);
}

public Image getColumnImage(Object element, int columnIndex) {
            return null;
        }

        public String getColumnText(Object element, int columnIndex) {
            File file=(File)element;
            switch (columnIndex) {
            case 0:
                return file.getName();
            case 1:
                return ""+file.length();
            case 2:
                return ""+file.isHidden();
            default:
                return "";
            }
        }

        public void addListener(ILabelProviderListener listener) {
          //  addListener(this);
        // this.addListener(this);
        }

        public void dispose() {
           
        }

        public boolean isLabelProperty(Object element, String property) {
            return false;
        }

@Override
public void removeListener(ILabelProviderListener listener) {
// TODO Auto-generated method stub

}

       
       
    }
}