How to retrieve items indices from a treeView?

VRonin

Just add the third parameter to the index method:

theModel.index(0,1) retrieves row 0, column 1 of the root
theModel.index(0,1,theModel.index(0,0)) retrieves row 0, column 1 of the child of the first item in the root

I hope this is clear enough

Kofr

Be aware that TreeView is very limited and has many bugs.
Indexes are unsafe to use. You can find bugreports on qt bugreports.
You may want to support https://bugreports.qt.io/browse/QTBUG-56490?filter=-2

VRonin

@Kofr said in How to retrieve items indices from a treeView?:

Indexes are unsafe to use

Just to clarify: They are 100% safe to use in the C++ side

Kofr

@VRonin so far they are not manipulated by TreeView itself

Haitham

@Kofr I've read your question one year ago, referring to this one

That's why you are saying it has many bugs?

let me clarify why I needed to retrieve the index, I'm trying to access each item on its own so I can apply a specific delegate to it (i.e. the green icon next to Camera connected will turn on if a specific condition is met on the back-end, that's why I tried to address each item on its own.

So far the method VRonin provided worked well and gave me the data I expected, so I am hoping when I finish my code, manipulating the items through the back-end, the delegate will be applied correctly.

I will keep you posted if I encountered any problem, thanks for the heads up.

Kofr

@Haitham the problems begin occures when you make item moves in TreeView. After this operation items are shown incorrectly and you can not catch correct indexes unfortunataly.

Haitham

@VRonin
Thanks so much buddy, your method worked and I understood it, the problem with my method that I wasn't referring to a parent item so I can get its child.

What I eventually want to achieve is to let the delegates react to some back-end code, so I want to apply delegates to only a specific item once the condition is met (e.g., if Camera is connected, the green off icon should be replaced with a green on one) and so on. By saying so, I think it makes sense now why I wanted to be able to reach each item through its index.

Please, let me follow it by another question,
is it better to address the items on the C++ side or do it on the QML side?

Haitham

@Kofr

So far in my case, the items are all static and only the delegates are updated. I think I should not encounter this problem but we will see

Thanks a lot, once again!

VRonin

@Haitham said in How to retrieve items indices from a treeView?:

What I eventually want to achieve is to let the delegates react to some back-end code, so I want to apply delegates to only a specific item once the condition is met (e.g., if Camera is connected, the green off icon should be replaced with a green on one) and so on. By saying so, I think it makes sense now why I wanted to be able to reach each item through its index.

Just save the state as a separate role in the item and let the delegate check that role before deciding what to do

Haitham

@VRonin
Can you please provide an example or something to follow? Because I am still a newbie at both Qt and QML.
Sorry for bothering you with my many questions.

Update:
as you can see in the code, I change the state of the delegate through the mouse area in the delegate (it's commented out in the code). I was using it to test the states, now I've noticed another thing; Whenever I collapse the parent Item and then expand it, the previous states are not saved....does this have to do anything with what you mentioned?