Save checked items from uitree in a cell array

Hi all,

I have just started using the uitree for a basic app that I am designing. What I would like to do is save the NodeData from each checked item in cell arrays. For example let's say we have the following code.

function mycheckboxtreeapp
    fig = uifigure;
    cbt = uitree(fig,'checkbox','Position',[20 20 150 150]);
    
    % Assign callbacks in response to node check and selection
    cbt.CheckedNodesChangedFcn = @checkchange;
    cbt.SelectionChangedFcn = @selectchange;
    
    % First level nodes
    category1 = uitreenode(cbt,'Text','Vegetables','NodeData',[]);
    category2 = uitreenode(cbt,'Text','Fruits','NodeData',[]);

    % Second level nodes.
    % Node data is the weight of the food item (in grams)
    p1 = uitreenode(category1,'Text','Cucumber','NodeData',400);
    p2 = uitreenode(category1,'Text','Carrot','NodeData',65);
    p3 = uitreenode(category2,'Text','Apple','NodeData',183);
    p4 = uitreenode(category2,'Text','Banana','NodeData',120);

    % Expand the tree
    expand(cbt);
    
    % Create the function for the CheckedNodesChangedFcn callback
    % When this function is executed, it displays the total weight of all checked items
    function checkchange(src,event)
        nodes = event.LeafCheckedNodes;
        if ~isempty(nodes)
            data = [nodes.NodeData];
            display(sum(data));
        end
    end

    % Create the function for the SelectedNodesChangedFcn callback
    % When this function is executed, it displays the name of the selected item
    function selectchange(src,event)
        node = event.SelectedNodes;
        display(node.Text);
    end
end

Pretaining to the above, if I was to have all the items checked from the tree, I would like to get the following

{[400 65] [183 120]}

Similarly, if I had everything checked except the last item I would get the following:

{[400 65] [183]}

and so on...

For some reason I cannot accomplish the above. When I call cbt.CheckedNodes.NodeData I get the numbers one by one

Thanks for your help in advance.

Answer 1

[Bryant Lash]

I think the only good way to do this is to manually filter through the parents and do it that way. So under checkChange you'll have to do something like this:

if ~isempty(nodes)
    parents = [nodes.Parent];
    [uniqueParents,sort1,sort2] = unique(parents);
    cellSortedData = cell(max(sort2),1);
    for i = 1:size(nodes,1)
        cellSortedData{sort2(i),1}(end + 1,1) = nodes(i).NodeData; %Matlab doesn't love the end + 1 but honeslty it's so much easier, and if you have small numbers it literally doesn't matter
    end
end

Now this approach will pass your specs, but it'll have to be a little more complex if you need it to always output the same size cellSortedData (for example, if you want to only select the second base node and want the first cell element empty). THat's not too hard either though.