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From: Jason on 30 Jun 2010 13:20
Look at the reloadNode method for the tree. If you "reload" the parent level, then only the parent collapses, but you can keep the path and expand it back.

"Chris Ford" <chris.ford.vsi(a)gmail.com> wrote in message <hovvi3$hpf$1(a)fred.mathworks.com>...
> Hi,
>
> I have implemented a uitree in a GUI but am having a slight issue with updating the nodes in the tree. Right now, the only way I can figure out to refresh the nodes is to regenerate the tree entirely, which causes it to collapse down to the initial state (showing only the root node). I would like the tree to stay in its expanded state (whatever that may be) but to have the text and/or icon of a selected node change upon certain actions.
>
> For example:
>
> My tree is a project explorer that allows the user to navigate through a multi-layered struct type variable. Selecting a field with data in it will display that data to a table. This all works fine. I am trying to add an edit capability, in which the user can select a node in the tree (representing a field in the structure) and click a button to clear the data in that field. Then the tree should update to reflect this, without collapsing.
>
> For initializing the tree, I am doing the following:
>
> function initializeTree(hObject, eventdata, handles)
> screenSize=get(0,'ScreenSize');
>
> %Set up navigation tree for new/opened project
> root = uitreenode('v0','Current Project', handles.projectData.projectInfoStructData.projectName, [], false);
> tree=uitree('v0','Root',root,'ExpandFcn', {@expfcn_1});
> set(tree, 'Units', 'pixels', 'position', ...
> [screenSize(1,1)+screenSize(1,3)/80 ...
> screenSize(1,2)+screenSize(1,4)/40 ...
> screenSize(1,3)-screenSize(1,3)/1.3 ...
> screenSize(1,4)-screenSize(1,4)/10])
>
> cell_Data = cell(2,1);
> cell_Data{1} = handles.projectData;
>
> set(tree, 'NodeWillExpandCallback', {@nodeWillExpand});
> set(tree, 'NodeSelectedCallback', {@nodeSelected,hObject,handles});
> tmp = tree.FigureComponent;
> set(tmp, 'UserData', cell_Data);
>
>
> I could re-set the UserData in tmp (tree.FigureComponent) with the updated handles.projectData whenever it is altered, but I cannot seem to access the tree component from other callbacks that I create. Therefore, as of now I can only recall initializeTree, which replaces the existing tree with a new one with the updated data. This works, but is definitely not ideal from a user standpoint.
>
> Any help or suggestions are much appreciated!
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