通過TreeColumn實現“表格樹”TableTree

Eclipse 3.1裡deprecate了TableTree這個控制項，與之對應的jface的TableTreeViewer雖然沒有deprecate，但使用它會得到很多警告。在TableTreeViewer的第一列裡是不能顯示表徵圖的，因為這個位置被+/-符號佔用了，而且TableTree是顯示不出 Tree的層次的，也就是沒有縮排。

SWT 3.1裡的Tree控制項新支援了列的顯示，是通過TreeColumn來實現的。在jface裡則沒有添加新的viewer，使用原先的TreeViewer即可支援，下面是一段例子代碼，注意如果在windows裡運行要修改一下setInput()這條語句的參數，例如改為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) {                    }            }}

下面是運行畫面：