Determining QTreeWidget parent

[cnbp173]

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

[ChiliPalmer]

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.

[cnbp173]

Have done a work around.

item is the QTreeWidgetItem selected

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

QTreeWidgetItem *upperParent = item;
while(upperParent->parent())
   upperParent = upperParent->parent();

if(upperParent==TreeWidget->topLevelItem(0))
 ......
else if (upperParent==TreeWidget->topLevelItem(1))

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

Cheers

[wysota]

Nice spaghetti code, however you can do this:

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

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

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[cnbp173]

Thanks - that seems a lot more elegant

R

[marcp01]

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.

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());
           }
       }
    }
}

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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