Sharing a QTreeWidget item across two tabs in Pyside2

[supratik]

First of all thanks for this elaborate explanation. It helped me a lot in clearing my misconception.

I am very new to Pyside framework. It will be really helpful if you could help me with the first point i.e Make a method that returns you the correct part of the data structure based on the combo box selection. . I am not very sure how to do it.

How do I add tree widget pointers in Python ?

Is there any other way I can use the same tree in two tabs. The same tree is used in number of places and if I make two trees just for the sake of switching tabs it creates too much confusion in the other parts of code.
Sorry for my less knowledge about Pyside and this forum also.

Thanks again

[d_stranz]

How do I add tree widget pointers in Python ?

The same way you probably already did it: self.ReqTree = QtWidgets.QTreeWidget, except that now you need two of them, one for each tab.

Make a method that returns you the correct part of the data structure based on the combo box selection.

I don't know what the data is that you are displaying in your tree widget. I assume it is some hierarchical data because you chose a tree to display it. I also assume that, based on the combo box selection, you are only displaying part of the data in the tree, not all of the data.

I am not that good at Python, but a Python list seems like one way to construct a tree-shaped data structure. A list containing lists, which contain lists, and so on. So say your top-level list has five items in it, and the combo box is used to choose one of those five items. You then want to display the list hierarchy that starts with that item.

You have two ways to find that place in the top-level list. If the top-level list items are the same strings you put in the combo box, then it is easy - you just look at each item in the top-level list until you find the match. If the strings in the combo box are not in the list, then you can use the alternative signal from the combo box, the one that returns the integer index of the item that was selected. Using that index, you get the top-level list item at that location.

theList = [[A, [Aa, [a_i, a_ii, a_iii], [a_iv, a_v, a_vi], [a_vii, a_viii, a_ix], ...], [b, [b_i, b_ii], [b_iii, b_iv, b_v]], ...], [B, [Bb, [...]]], ...]

theList = [[A, [Aa, [a_i, a_ii, a_iii], [a_iv, a_v, a_vi], [a_vii, a_viii, a_ix], ...], [b, [b_i, b_ii], [b_iii, b_iv, b_v]], ...], [B, [Bb, [...]]], ...]

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theList at index 0 gives you [A, [Aa, [a_i ...]]] and you build your tree widget items starting there.

You might be using a different data structure, but the idea is the same - find a way to locate the place you want based on the combo box selection, and use that to build the tree.

[supratik]

Thanks again for the elaborate explanation for the list data structure.
Actually I am reading data from xml file and storing it in form of QTreeWidget with parents and child as the different elements of the tree.
As evident from your post, I have to create two different widgets for two different tabs and I can't switch them between tabs..

I also thought of creating two different tree widgets , but the linkages of the tree in different places of the code was forcing me to not create another instance and just try to switch the same instance between tabs.
But now I guess I have to create two different treewidgets and display them in different tabs , according to the ComboBox selection .

Thanks for the help

[d_stranz]

If you are reading from an XML file, then I suggest you read the file into a QDomDocument instance. If you keep the data this way, it makes it easy to find an element at any level of the document, using QDomDocument::elementsByTagName(). It is also easy to build the tree from that point - just follow the QDomNodeList down deeper into the document.

[supratik]

Thanks a lot
I created two instances of the QTreeWidget and modified my code.
It was worth learning for newbie like myself.
I will use this forum again and hope to learn more