通过TreeColumn实现“表格树”TableTree

Eclipse 3.1里deprecate了TableTree这个控件，与之对应的jface的TableTreeViewer虽然没有deprecate，但使用它会得到很多警告。在TableTreeViewer的第一列里是不能显示图标的，因为这个位置被+/-符号占用了，而且TableTree是显示不出 Tree的层次的，也就是没有缩进。

SWT 3.1里的Tree控件新支持了列的显示，是通过TreeColumn来实现的。在jface里则没有添加新的viewer，使用原先的TreeViewer即可支持，下面是一段例子代码，注意如果在windows里运行要修改一下setInput()这条语句的参数，例如改为setInput(new File("c:\\"))。

import java.io.File;

import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.TreeColumn;


public class TreeColumnTest {
    
    public void run(){
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new FillLayout());
        
        final TreeViewer viewer = new TreeViewer(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("/"));

        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 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) {
            
        }

        public void dispose() {
            
        }

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

        public void removeListener(ILabelProviderListener listener) {
            
        }
        
    }
}

下面是运行画面：