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

[qlands]

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:

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

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

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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:

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

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

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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