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;
    }
}