I'm playing around with the TreeViewBranchListener. Is this the correct
way to retrieve the node that was expanded?
public void branchExpanded(TreeView treeView, Sequence.Tree.Path
path) {
TreeNode node = (TreeNode)
Sequence.Tree.get(treeView.getTreeData(), path);
}
-- Edvin
Den 06.05.2011 14:42, skrev Edvin Syse:
I agree 100%, most likely one will extend TreeNode/TreeBranch in most
cases. By the way, great work on the API's of Pivot - they are really
nice and clean. I also like that you have put the adapter classes inside
the interfaces - smart move :)
-- Edvin
Den 06.05.2011 14:36, skrev Greg Brown:
You mean, why isn't the userData property generic? No particular
reason - that idea never came up. But honestly, I think making the
entire class a generic might be a bit too verbose.
TreeNode<MyObject> treeNode = new TreeNode<MyObject>();
vs.
TreeNode treeNode = new TreeNode();
User data is really just a minor convenience. Many apps that use tree
views are likely to implement their own node and branch classes and
wouldn't benefit from it anyways. I could potentially see an argument
for parameterizing the getUserData() method, though.
On May 6, 2011, at 8:25 AM, Edvin Syse wrote:
OK. I think I'll start by wrapping my objects in TreeNode and
TreeBranch and see how it goes. Can I ask why you didn't add generics
to these objects? It would be nice to be able to do:
TreeNode<MyObject> node = new TreeNode<MyObject>();
node.setUserData(instanceOfMyObject)
...
MyObject myObject = node.getUserData()
-- Edvin
Den 06.05.2011 14:16, skrev Greg Brown:
If a node implements org.apache.pivot.collections.List, it is
considered a branch. Otherwise, it is a leaf.
On May 6, 2011, at 8:06 AM, Edvin Syse wrote:
ListAdapter was nice, thanks :)
But how do I express what is supposed to be Leaf nodes and what to
be Branch nodes?
-- Edvin
Den 06.05.2011 13:49, skrev Greg Brown:
Have you looked at
org.apache.pivot.collections.adapter.ListAdapter? You might be
able to use this in conjunction with TreeViewBranchListener to
construct your tree nodes from your backing data structure on demand.
G
On May 6, 2011, at 7:31 AM, Edvin Syse wrote:
I have a tree-structure represented by a list of domain objects.
Some of the domain objects have a "children" property with a
java.util.List of children. The TreeView#setTreeData method takes
a org.apache.pivot.collections.List, and I figured I could do:
setTreeData(new ArrayList(myJavaUtilListList.toArray()));
This works so that I can see the first level of nodes, but I
don't know how to express branch nodes. Also, I would like to
lazy load some of the nodes. I think I need to use the
TreeViewBranchListener somehow, but I can't find any
documentation or examples.
Do I need to wrap all my domain objects in TreeNodes or is there
another way to do this?
-- Edvin
