TreeGrid openAll question

[zdary]

Hi,

I have a TreeGrid defined as follows:

		Tree grid1Tree = new Tree();
		grid1Tree.setModelType(TreeModelType.PARENT);
		grid1Tree.setRootValue("ROOT");  
		grid1Tree.setTitleProperty("title");  
		grid1Tree.setIdField("nodeID");  
		grid1Tree.setParentIdField("parentNode");  
		grid1Tree.setNameProperty("name");
		...
		TreeGrid treeGrid = new TreeGrid();
		treeGrid.setDataSource(DataSource.get("DS"));
		treeGrid.setData(grid1Tree);

What is the best way to expand all selected nodes?

At the moment I call

TreeGrid.getData().openAll(node);

the problem is that this doen't expand all nodes recursively. It fetches data for one level only. Then I do the recursion manually. First I check if all nodes under selected nodes are open and loaded. If it at least one node is not loaded then I can expect DataArrivedEvent where I call openAll for the new loaded nodes. When all nodes are open and loaded then I start the drag and drop operation.

		boolean isOpen = sourceTreeGrid.getData().isOpen(node);
		boolean isLoaded = sourceTreeGrid.getData().isLoaded(node);

		treeGrid.addDataArrivedHandler(new DataArrivedHandler() {
			@Override
			public void onDataArrived(DataArrivedEvent event) {
				Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() {
					@Override
					public void execute() {
						TreeGrid.getData().openAll(node);
					}
				});
			}
		});

There is, however, too many server-side calls. Is there a better way to do so?
My goal is to drag and drop leaves on selected nodes in a tree.

best regards,
Zdary

[Isomorphic]

Set loadDataOnDemand to false, and the whole tree will be loaded by the first request, then openAll() will really open all nodes.

[kavyabellary]

use this code:

 addDataArrivedHandler(new DataArrivedHandler(){

			@Override
			public void onDataArrived(DataArrivedEvent event) {
				// TODO Auto-generated method stub
				grid.getData().openAll();
			}
};

[zdary]

Hi,

I cannot effort to load up the whole tree at one because it can be a big one.
I'd prefered a mix mode. Loading on demand as long as the user click on the tree.

When I need it I would call something like

boolean fetchAll = true;
boolean willFetchData = grid.getData().openAll(fetchAll);

if I set and reset loadDataOnDemand later then there is no difference in criteria so I cannot even distinguish it in a DMI.

kavyabellary: How will you know which DataArrivedEvent was the last one?