java GWT Cell tree，如何使用？
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GWT Cell tree, how to use?
提问by Noor
Can somebody explains how to use the GWT cell tree. I am trying to google it but not finding any valuable tutorial??
有人可以解释如何使用 GWT 单元树。我想用谷歌搜索但没有找到任何有价值的教程？？
Thanks
谢谢
回答by Yusuf K.
回答by Ben
For those who don't like the google showcase example like me can use this example; http://google-web-toolkit.googlecode.com/svn/javadoc/2.1/com/google/gwt/user/cellview/client/CellTree.html
对于像我这样不喜欢google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
you can just copy paste it and it works. "
你可以复制粘贴它，它的工作原理。”
Trivial example
小例子
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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