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
