Re: GWT Cell tree refresh issue

On Tuesday, September 3, 2013 11:30:27 AM UTC+2, Harish Alwala wrote:

Thanks for reply,

Here I am attaching 3 classes.

MyNode.java

 This is a bean class that holds the data to display in the tree  

MyTreeView.java

 Here we build the tree and add the nodes to the tree. First time when I build the treeView with data it invokes buildTree() where I call CellTree() constructor with MyViewModel as parameter, that will invoke getNodeInfo() (overidden method) of MyViewModel class. This is how I could able to see the data in tree view. But when I try to add a new child to the tree, I call the same flow, but it doesnot invoke the getNodeInfo() of the MyViewModel class. Hence I dont see the updated tree.

What do you mean by "I call the same flow" ?

To update your tree, the NodeInfo has to call updateRowData/updateRowCount on the HasData passed to it. With a DefaultNodeInfo, you'd have to call updateRowData/updateRowCount of your AbstractDataProvider. With a ListDataProvider, this is done by modifying the list returned by the ListDataProvider's getList(); in case you modified the underlying list (in your case, not possible as you copy it into a new ArrayList) then you can call the ListDataProvider's refresh(), but as the javadoc tells you, you should prefer getList().

Think about a CellTree as if it was made of nested CellLists (that's more or less the case), each one's data being provided by the NodeInfo. You have to work with your tree of NodeInfo nodes or their ListDataProvider to update the tree. The way I do it is I keep a Map<MyNode, ListDataProvider<MyNode>>, and update the tree through the MyViewModel with methods like add(MyNode parent, MyNode child).

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