Moving a branch in treeview

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I have stumbled upon this[^] suggestion that claims following:

If I move children of the node to the new node, all their descendants will move with them automatically, so there would be no need for recursive copying of nodes.

I really like this idea, but I do not believe it is possible in WinAPI, based on my reading of the documentation.

QUESTION:

Is this information correct -> can you truly move entire branch by just changing the parent of the topmost child?

If it is, can you show me how to do that?

Posted 23-Feb-15 18:10pm

AlwaysLearningNewStuff

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Sergey Alexandrovich Kryukov 24-Feb-15 0:14am

Why you can't believe that? Did you even try it? It would be more than natural: you just change one pointer.
—SA

AlwaysLearningNewStuff 24-Feb-15 0:23am

I am trying to do it right now. I have no idea how to do this. Can you advise me? Thank you for commenting, it is good to "hear: you after such a long time.

Best regards.

Richard MacCutchan 24-Feb-15 4:24am

That seems quite straightforward, and easy enough to test.

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-02-23T18:45:00

You know, I keep answering your questions not having actually use Windows API for at least a decade, and never appreciating such language as C++. And I simply never ever spent a minute (should I say "wasted" :-)) on manipulating of tree views in C++ and raw Windows API. Nevertheless…

Windows API tells us that, to insert a tree view node, you have to send message TVM_INSERTITEM with TVINSERTSTRUCT as LPARAM. In other words, you give Windows API a pointer:
https://msdn.microsoft.com/en-us/library/windows/desktop/bb773733%28v=vs.85%29.aspx[^],
https://msdn.microsoft.com/en-us/library/windows/desktop/bb773452%28v=vs.85%29.aspx[^].

Now imagine that you do the same, but not for a brand-new structure representing a tree node, but representing already created tree node with all the sub-tree of this node, just detached from the tree view, the some or another one. Isn't that apparent that it will attach the whole sub-tree? This is the same as in case of tree as a data structure.

I'm also coming from one simple "practical" thought: if Windows API required recursive re-creation of sub-tree just for moving one from one parent to another, it would be extremely stupid API. I would hardly believe such API could ever survive the market.

I hope that from this point you can continue looking through Windows API, the way I started it, and finalize this solution… :-)

—SA