JFace中的表格型樹TableTreeViewer

表格型樹是用TableTreeViewer來實現,自從SWT下的TableTree被廢棄之后,其擴展TableTreeViewer也成了雞肋,不再被建議使用,既然Tree可以實現表格型樹,那么其擴展TreeView當然也沒有問題,用TreeViewer實現的表格型樹,之前的TreeViewer實例菜單的呢過功能代碼不用做任何修改.

修改的不多,一是在主程序為樹加上幾列對象TreeColumn,二是創建一個新的表格型樹的標簽器,關於TreeColumn在Tree組件的時候有此內容的講解.這個地方和之前一樣.

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);
        // -----------界面核心代碼-------------------
        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("名稱");
        column.setWidth(150);
        column = new TreeColumn(tree, SWT.LEFT);
        column.setText("子結點數");
        column.setWidth(80);
        column = new TreeColumn(tree, SWT.LEFT);
        column.setText("性別");
        column.setWidth(40);

        tv.setContentProvider(new TreeViewerContentProvider());
        tv.setLabelProvider(new MyTableLableProvider());
        // 和TableViewer一樣，數據的入口也是setInput方法
        List<Country> input = (List)DataFactory.createTreeData();
        tv.setInput(input);
        // --------------插入代碼：START------------------
        MyActionGroup actionGroup = new MyActionGroup(tv);// 生成一個ActionGroup對象
        actionGroup.fillContextMenu(new MenuManager());// 將按鈕注入到菜單對象中
        // -----------END------------------
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}

標簽器換了一個,它必須實現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;
    }
}