Determining QTreeWidget parent

Hello all,

I'm looking for a little help.

I have a QTreeWidget with a number of parents and numerous children, i.e.

parent1
-child
-child
- child
- child
parent2
-child
- child
parent3
-child

I'm using the contextMenuEvent to trigger a slot dependent upon the child picked. As such, I'm trying to determine which parent the child is associated with.

How can I cast the parent of the child even if it is a child of a child?

Cheers
Robbie

QTreeWidgetItem::parent() always works to get the parent of an Item. You have to be careful, though. On the top level this method returns null, not the root Item.

Have done a work around.

item is the QTreeWidgetItem selected

Code:

---

QTreeWidgetItem *upperParent = item;
while(upperParent->parent())
   upperParent = upperParent->parent();
 
if(upperParent==TreeWidget->topLevelItem(0))
 ......
else if (upperParent==TreeWidget->topLevelItem(1))

---

This lets me get back up to the parent of any item selected and attach different outcomes dependent on the child choice

Cheers

Nice spaghetti code, however you can do this:

Code:

---

QTreeWidgetItem *item = ...;
while(item->parent()) item = item->parent();
int index = TreeWidget->invisibleRootItem()->indexOf(item);
switch(index) {
  case 0: ...; break;
  case 1: ...; break;
  // etc.
}

---

Thanks - that seems a lot more elegant

R

Here's some code I use to expand the tree all the way to the root.

It's a recursive function that accepts a QTreeWidgetItem *item pointer and travels up the tree, starting as position of *item, and expands all parents in the *item's branch until it reaches the *item's topLevelItem.

Code:

---

void MyWidget::expandTree(QTreeWidgetItem *item) {
    QTreeWidgetItem *parent = item->parent();
    if (parent) {
       parent->setExpanded(true);
       int topLevel = table->indexOfTopLevelItem(parent);
       if (topLevel!=-1) {
        QTreeWidgetItem *root = table->topLevelItem(topLevel);
        root->setExpanded(true);
       } else {
           if (item->parent()) {
               expandTree(item->parent());
           }
       }
    }
}

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