Hide Parent and show only children in QTreeView

[y.s.bisht]

Hi All,

I am stuck with a problem, I was wondering is there any way to just show children in a Qtreeview not it's parent.
For instance.

If this is the tree

AAA--
   |
      A _
          |
          a1
          |
          a2
          |
          a3
          |
          a4

AAA--
   |
      A _
          |
          a1
          |
          a2
          |
          a3
          |
          a4

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I want only this to be shown, that is without Root node (AAA in this case)

A _
      |
      a1
       |
      a2
       |
      a3
       |
      a4

A _
      |
      a1
       |
      a2
       |
      a3
       |
      a4

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I searched a lot in net, but without success. If I hide the root row, I am not able to see it's children,I think there should be some way to do that .


Thanks in advance.

[ChrisW67]

QTreeView::setRootIndex() looks good to me.

[wysota]

QAbstractItemView::setRootIndex()

[y.s.bisht]

Thanks you for your reply...
I am doing the same thing in my code but has no effect...

MyModel* model = new MyModel( ui->treeView ); //MyModel inherits QAbstractItemModel
ui->treeView->setModel(model);
ui->treeView->setRootIndex(model->index(2,0,QModelIndex()));

I want to make third row my parent.


modelView.png

[wysota]

It has no effect because your model has only one row in its top-most level of the hierarchy.

[y.s.bisht]

Thanks wysota,
when I changed

ui->treeView->setRootIndex(model->index(2,0,QModelIndex()));

to

ui->treeView->setRootIndex(model->index(0,0,QModelIndex()));

First root become invisible, but is there anyway to make second child of root, main root ?

[wysota]

You can make any index the root index if you pass it to setRootIndex().

QModelIndex grandparentIndex = model->index(0,0);
QModelIndex parentIndex = model->index(0,0, grandparentIndex);
QModelIndex idx = model->index(2, 0, parentIndex);
ui->treeView->setRootIndex(idx);

QModelIndex grandparentIndex = model->index(0,0);
QModelIndex parentIndex = model->index(0,0, grandparentIndex);
QModelIndex idx = model->index(2, 0, parentIndex);
ui->treeView->setRootIndex(idx);

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[ChrisW67]

There is no second child of the root in your example... that's the point. The third row in your display is the first child of the first child of the topmost item.


Edit: Yeah, what wysota said.

[wysota]

Yeah, of course my code won't work with this exact model because there is no third child of the first child of the first child of the model. But I hope OP gets the picture now.