How do I delete a top level QTreeWidgetItem from a QTreeWidget?

Question

I'm attempting to remove a top level tree widget item if there are no child nodes within the top level item. What is the correct way to do this? I can't seem to find the API call within Qt's documentation. Is it safe to just call delete on the top level tree widget item? I haven't run into any issues yet, but I'd like to know if that's safe practice. Thanks much.

if(topLevelTreeWidgetItem->childCount() > 1) {
  topLevelTreeWidgetItem->removeChild(childItem);
}
else
{
  delete topLevelTreeWidgetItem;
}

score 18 · Accepted Answer · answered Feb 22 '12 at 16:48

18

deleteing a QTreeWidgetItem directly is perfectly safe.

According to the documentation for ~QTreeWidgetItem():

Destroys this tree widget item. The item will be removed from QTreeWidgets to which it has been added. This makes it safe to delete an item at any time.

I've used delete on many QTreeWidgetItems in practice and it works quite well.

answered Feb 22 '12 at 16:48

Chris

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Thank you for confirming this. I have made my top level items in my QTreeWidget QTreeWidgetItem pointers in order to make reference to them throughout my code. Making them pointers makes it easy to delete them and re-initialize them if needed. – Cameron Tinker Feb 22 '12 at 17:08

Juraj Blaho · Answer 2 · 2014-08-20T11:29:47.310

5

To delete a top level item call QTreeWidget::takeTopLevelItem method and then delete the returned item:

delete treeWidget->takeTopLevelItem(index);

Where index is index of the item to be removed.

edited Aug 20 '14 at 11:29

answered Feb 22 '12 at 09:41

Juraj Blaho

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score 2 · Answer 3 · answered May 06 '14 at 12:19

2

Function takeChild only works with QTreeWidgetItem. With QtreeWidget, you can use QtreeWidget::takeTopLevelItem(int index)

answered May 06 '14 at 12:19

Starfight

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How do I delete a top level QTreeWidgetItem from a QTreeWidget?

3 Answers3