How to check/uncheck all the items in a QTreeWidget?

Hi,

I'm using QT Creator to develop an small application. I have a QTreeWidget in the UI and I use the following code to populated:

Code:

---

QTreeWidgetItem *mainhh = new QTreeWidgetItem(this->ui->treetables);
    mainhh->setText(0, tr("Main Table"));
    QStringList lista;
    //Move the items to the list
    lista << tr("Sub-table 1");
    lista << tr("Sub-table 2");
    lista << tr("Sub-table 3");
    //Many more items ........
    //Add the list of subtables as a children of Main Table
    new QTreeWidgetItem(mainhh,lista,0);
   //Many more parent nodes and childs.......
  this->ui->treetables->expandAll(); //Expand the tree

---

The code works fine but how can I check/uncheck all the items after I have fulled populated the tree e.g., by clicking a button called "Check/Uncheck all". I guess I need to set some flags and properties to each items with something like:

Code:

---

setFlags(Qt::ItemIsSelectable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
  setCheckState(Qt::Unchecked); //or QT::Checked

---

But.... I don't know how to go through all the items in the tree to set those properties and flags to each item.

Many thanks,
QLands

Can't you do it while populating the tree?

Well... Yes I can but I still need to implement a "Check/Uncheck all" button. And for this I would like to use a FOR statement. For example, if I use a QListWidget is can implement the code really easy with:

Code:

---

for (pos =0; pos <= this->ui->lsttables->count()-1; pos++)
    {
        this->ui->lsttables->item(pos)->setFlags(Qt::ItemIsSelectable | Qt::ItemIsUserCheckable | Qt::ItemIsEnabled);
        this->ui->lsttables->item(pos)->setCheckState(Qt::Unchecked);
    }

---

But, with a QTreeWidget, I have no clue how to do it.

Thanks.

Code:

---

void checkSubTree(QTreeWidgetItem *item, Qt::CheckState st){
  item->setCheckState(0, st);
  for(int i=0;i<item->childCount();i++)
    checkSubTree(item->child(i), st);
}
 
for(int i=0;i<tree->topLevelItemCount();i++){
  checkSubTree(tree->topLevelItem(i), Qt::Checked);
}

---

Be warned it might be very slow for many items. A model-based approach should be much faster (apart when using QStandardItemModel).

Brilliant...

Thanks a lot.

maybe you can use a QList<QTreeWidgetItem *> to store all the point of all the item object , and just use a for loop to check/uncheck , this will be more faster and just use a little of memory .....