How to find element in QTreewidget in python?

MarcinOS

How to select this element in Qtreewidget using the path to an element? The path is written as an example string:
parent/parent/parent/parent/element

SGaist

Hi,

Do you mean programmatically ?

MarcinOS

@SGaist Of course :D
Fortunately, I don't have a problem selecting it with the mouse ;-)

JonB

@MarcinOS
Well, you just parse that into separate segments by QString::split('/') and then walk down the tree (from the top, you can do it either recursively or iteratively) matching each element against a child. What you look at depends on what you are matching each item against, e.g. perhaps it's the model's DataRole value. And obviously depending on what you want you can either select just the bottom element or all the parent nodes leading to it as well as you go.

SGaist

In addition to what @JonB wrote, you are looking for the match model function.

JonB

@SGaist
If I may, at the risk of being shot down, this is not the right call to use here! Two reasons:

Perform a search on all items looking at their value. Say there are a million nodes/leaves in the model! For parent/parent/parent/parent/element OP knows where he wants to go to, search every value and returning a list is not efficient.
Further, for parent/parent/parent/parent/element searching for element does not tell you whether/which one found has desired parent/parent/parent/parent path. You are going to have to look back up ancestors of found items to discover this. Wasted effort.

Assuming OP does mean by parent/parent/parent/parent/element that the search is intended to pick the particular parents specified. Different if he does not actually care what those are, but that's not what the question implies (to me).

MarcinOS

Can I ask for a piece of code? I'm a very new coder, and even though I've used many PyQT elements in my application, QTreewidget is too complicated for me. I managed to fill it with data and retrieve the entire path to the selected item correctly, but searching for and selecting an item in the tree based on its path is beyond my current abilities.

JonB

@MarcinOS said in How to find element in QTreewidget in python?:

retrieve the entire path to the selected item correctly,

What do you mean by this? I didn't think QTreeWidget has an actual "path", what code did you use? Are you talking about writing your code like, say, https://stackoverflow.com/a/41042103/489865 (very first sample code box)?

SGaist

@JonB said in How to find element in QTreewidget in python?:

@SGaist
If I may, at the risk of being shot down, this is not the right call to use here! Two reasons:

Perform a search on all items looking at their value. Say there are a million nodes/leaves in the model! For parent/parent/parent/parent/element OP knows where he wants to go to, search every value and returning a list is not efficient.

Further, for parent/parent/parent/parent/element searching for element does not tell you whether/which one found has desired parent/parent/parent/parent path. You are going to have to look back up ancestors of found items to discover this. Wasted effort.

Assuming OP does mean by parent/parent/parent/parent/element that the search is intended to pick the particular parents specified. Different if he does not actually care what those are, but that's not what the question implies (to me).

No reason to shoot you down. My idea was rather to use match following each level so you should only do the search on the elements from the child column of the previous item.

JonB

@SGaist said in How to find element in QTreewidget in python?:

My idea was rather to use match following each level so you should only do the search on the elements from the child column of the previous item.

I was thinking/assuming recursive. I forgot match() can do one level only, that changes things and makes it fine! :)

MarcinOS

Problem solved :)
https://stackoverflow.com/q/77850224/21149846