Custom the Width/Pos of Column/Widget of Each row in QTreeView

If I create a QTreeView,
If it is a multi-hirarchy tree with 2 Columns
This is how it gonna look like

Code:

---

Column0 --------------- Column1
------------------------------
Widget0 --------------- Widget
   Widget00 ----------- Widget
   Widget01 ----------- Widget
       Widget010 ------ Widget
 
Widget1 --------------- Widget
   Widget10 ----------- Widget
       Widget100 ------ Widget
   Widget11 ----------- Widget
       Widget110 ------ Widget

---

All the widgets in Column0 look like they are in a tree
But all the widgets in Column1 always aligned in the same line
And with the depth of the tree grows, the Column1 might block Column0

This is what I expected:

Code:

---

Column0 --------------- Column1
------------------------------
Widget0 --------------- Widget
   Widget00 --------------- Widget
   Widget01 --------------- Widget
       Widget010 --------------- Widget
 
Widget1 --------------- Widget
   Widget10 --------------- Widget
       Widget100 --------------- Widget
   Widget11 --------------- Widget
       Widget110 --------------- Widget

---

Also here is a link of picture of the effect that I want:
I think that's a QTreeView,

Attachment 11618

Seems like he can customize the width of the widget/column in each row.
I dont have the src code.

How did he do it?

Thanks for reading and answering my question.