[Qt-interest] Deleting the treewidget item

[Srdjan Todorovic]

Hi,

On 22/06/2009, Ferenc Stelcz <ferenc at stelcz.hu> wrote:

> //This will remove all the children of *item*
> //Be warned, that the child items won't be deleted!
> for(int childcount=0; i<item->childCount(); ++i)
> {
> 	QTreeWidgetItem *currentChildItem = item->child(i);
> 	item->removeChild(currentChildItem);
>
> 	/*
> 		delete currentChildItem;
> 		currentChildItem = 0;
> 	*/
> }

I've been a bit wary of deleting items from a tree widget. What
happens if you have 10 children, and childcount == 9?
If you have removed the first 9 children, won't item->child(9) be out of bounds?

> //This piece tries to remove *item*
> QTreeWidgetItem *rootItem = item->parent(); //We get the parent of item
> rootItem->removeChild(item); //Then remove item

So I tend to do something like this:

  QList<QTreeWidgetItem *> children = item->takeChildren();
  for (int i = 0; i < children.count(); ++i)
  {
    QTreeWidgetItem *tmp = children.at(i);
    delete tmp;
    tmp = 0;
  }

Which means these items are under my control now and I should be able
to delete them safely (assuming the pointers are not used somewhere
else).

Srdjan