JFace中的表格型树TableTreeViewer

表格型树是用TableTreeViewer来实现,自从SWT下的TableTree被废弃之后,其扩展TableTreeViewer也成了鸡肋,不再被建议使用,既然Tree可以实现表格型树,那么其扩展TreeView当然也没有问题,用TreeViewer实现的表格型树,之前的TreeViewer实例菜单的呢过功能代码不用做任何修改.

修改的不多,一是在主程序为树加上几列对象TreeColumn,二是创建一个新的表格型树的标签器,关于TreeColumn在Tree组件的时候有此内容的讲解.这个地方和之前一样.

TreeViewer3.java

 public class TreeViewer3 {
     public static void main(String[] args) {
         new TreeViewer3().open();
     }

     public void open() {
         final Display display = new Display();
         final Shell shell = new Shell();
         shell.setSize(300, 300);
         // -----------界面核心代码-------------------
         shell.setLayout(new FillLayout());
         TreeViewer tv = new TreeViewer(shell, SWT.BORDER);

         Tree tree = tv.getTree();
         tree.setHeaderVisible(true);
         TreeColumn column = new TreeColumn(tree, SWT.LEFT);
         column.setText("名称");
         column.setWidth(150);
         column = new TreeColumn(tree, SWT.LEFT);
         column.setText("子结点数");
         column.setWidth(80);
         column = new TreeColumn(tree, SWT.LEFT);
         column.setText("性别");
         column.setWidth(40);

         tv.setContentProvider(new TreeViewerContentProvider());
         tv.setLabelProvider(new MyTableLableProvider());
         // 和TableViewer一样，数据的入口也是setInput方法
         List<Country> input = (List)DataFactory.createTreeData();
         tv.setInput(input);
         // --------------插入代码：START------------------
         MyActionGroup actionGroup = new MyActionGroup(tv);// 生成一个ActionGroup对象
         actionGroup.fillContextMenu(new MenuManager());// 将按钮注入到菜单对象中
         // -----------END------------------
         shell.open();
         while (!shell.isDisposed()) {
             if (!display.readAndDispatch())
                 display.sleep();
         }
         display.dispose();
     }
 }

标签器换了一个,它必须实现ITableLabelProvider接口.

 public class MyTableLableProvider implements ITableLabelProvider {
     public String getColumnText(Object element, int columnIndex) {
         ITreeEntry entry = (ITreeEntry) element;
         switch (columnIndex) {
         case 0:
             return entry.getName();
         case 1:
             List list = entry.getChildren();
             if (list == null)
                 return "";
             return String.valueOf(list.size());
         case 2:
             if (entry instanceof People) {
                 boolean sex = ((People) entry).isSex();
                 return sex ? "男" : "女";
             }
             return "";
         default:
             return "";
         }
     }

     public Image getColumnImage(Object element, int columnIndex) {
         return null;
     }
     public void addListener(ILabelProviderListener listener) {}
     public void removeListener(ILabelProviderListener listener) {}
     public void dispose() {}
     public boolean isLabelProperty(Object element, String property) {
         return false;
     }
 }