GWT Cell树，如何使用？

Question

有人可以解释一下如何使用 GWT 单元树吗？我正在尝试谷歌搜索，但没有找到任何有价值的教程？

谢谢

Answer 1

尝试;

Google 示例 1

包含 onModuleLoad 方法。 :)

Answer 2

对于那些像我一样不喜欢谷歌展示示例的人可以使用这个示例；
http:// /google-web-toolkit.googlecode.com/svn/javadoc/2.1/com/google/gwt/user/cellview/client/CellTree.html

您只需复制粘贴即可。
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简单的例子

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public class CellTreeExample implements EntryPoint {

  /**
   * The model that defines the nodes in the tree.
   */
  private static class CustomTreeModel implements TreeViewModel {

    /**
     * Get the {@link NodeInfo} that provides the children of the specified
     * value.
     */
    public <T> NodeInfo<?> getNodeInfo(T value) {
      /*
       * Create some data in a data provider. Use the parent value as a prefix
       * for the next level.
       */
      ListDataProvider<String> dataProvider = new ListDataProvider<String>();
      for (int i = 0; i < 2; i++) {
        dataProvider.getList().add(value + "." + String.valueOf(i));
      }

      // Return a node info that pairs the data with a cell.
      return new DefaultNodeInfo<String>(dataProvider, new TextCell());
    }

    /**
     * Check if the specified value represents a leaf node. Leaf nodes cannot be
     * opened.
     */
    public boolean isLeaf(Object value) {
      // The maximum length of a value is ten characters.
      return value.toString().length() > 10;
    }
  }

  public void onModuleLoad() {
    // Create a model for the tree.
    TreeViewModel model = new CustomTreeModel();

    /*
     * Create the tree using the model. We specify the default value of the
     * hidden root node as "Item 1".
     */
    CellTree tree = new CellTree(model, "Item 1");

    // Add the tree to the root layout panel.
    RootLayoutPanel.get().add(tree);
  }
}

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