QTreeWidget Horizontal header double click event???

Hello,

any1 know how to catch "QTreeWidget Horizontal header double click event"?
this is my QtreeWidget, what i wont is when i double click on horizontal header item, Tree should check all the item in that selected column ..
any ideas ??

.H fie

Code:

ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QMainWindow>
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    void initTree();
 
private:
    Ui::MainWindow *ui;
 
private slots:
 
};
 
#endif // MAINWINDOW_H

.CPP file

Code:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include "MyStyle.h"
#include <QMultiMap>
 
QTreeWidget* pTree;
QList<QTreeWidgetItem*> lstWidgets;
QList<QTreeWidgetItem*> lstSubItems;
 
 
MainWindow::MainWindow(QWidget *parent) :    QMainWindow(parent),    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    pTree = NULL;
    initTree();
    QSize size(540,870);
    this->resize(size);
    this->setMinimumSize(size);
    this->setMaximumSize(size);
    ui->gridLayout->addWidget(pTree);
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::initTree()
{
    pTree = new QTreeWidget(this);
    pTree->setGeometry(10,10,520,850);
    pTree->setMaximumSize(520,850);
    pTree->show();
 
    QStringList lstheadrs;
    lstheadrs.append(" \n \n \n \n \n \n ");
    lstheadrs.append("1");
    lstheadrs.append("2");
    lstheadrs.append("3");
    lstheadrs.append("4");
    lstheadrs.append("5");
    lstheadrs.append("6");
    lstheadrs.append("7");
    lstheadrs.append("8");
    lstheadrs.append("9");
    lstheadrs.append("10");
    lstheadrs.append("11");
    lstheadrs.append("12");
    pTree->setHeaderLabels(lstheadrs);
    //------SET COLUMN WIDTH---------------
    pTree->setColumnWidth(0,190);
    for(int i = 1; i<=12; i++)
    {
        pTree->setColumnWidth(i,25);
    }
    MyStyle *headerStyl = new MyStyle(this->style());
    pTree->setStyle(headerStyl);
 
    //==========================================================================================================//
    QTreeWidgetItem *Node1 =  new QTreeWidgetItem(pTree, QStringList(QObject::tr("1")));
    Node1->addChild(new QTreeWidgetItem(QStringList(QObject::tr("1.1"))));
    Node1->addChild(new QTreeWidgetItem(QStringList(QObject::tr("1.2"))));
    Node1->addChild(new QTreeWidgetItem(QStringList(QObject::tr("1.3"))));
    pTree->expandItem(Node1);
    for(int iChild=0; iChild<Node1->childCount() ; iChild++)
        for(int i=1; i<lstheadrs.length(); i++)
            Node1->child(iChild)->setCheckState(i,Qt::Unchecked);
 
    lstWidgets.append(Node1);
     //==========================================================================================================//
    QTreeWidgetItem *Node2 =  new QTreeWidgetItem(pTree, QStringList(QObject::tr("2")));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.1"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.2"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.3"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.4"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.5"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.6"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.7"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.8"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.9"))));
    Node2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("2.10"))));
    pTree->expandItem(Node2);
    for(int iChild=0; iChild<Node2->childCount() ; iChild++)
        for(int i=1; i<lstheadrs.length(); i++)
            Node2->child(iChild)->setCheckState(i,Qt::Unchecked);
 
     lstWidgets.append(Node2);
     //==========================================================================================================//
    QTreeWidgetItem *Node3 = new QTreeWidgetItem(pTree,QStringList(QObject::tr("3")));
 
    QTreeWidgetItem *node3sub1 = new QTreeWidgetItem(Node3, QStringList(QObject::tr("3.1")));
    node3sub1->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.1.1"))));
    node3sub1->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.1.2"))));
    node3sub1->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.1.3"))));
    Node3->addChild(node3sub1);
    for(int iChild=0; iChild<node3sub1->childCount(); iChild++)
        for(int i=1; i<lstheadrs.length(); i++)
            node3sub1->child(iChild)->setCheckState(i,Qt::Unchecked);
 
    QTreeWidgetItem *node3sub2 = new QTreeWidgetItem(Node3, QStringList(QObject::tr("3.2")));
    node3sub2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.2.1"))));
    node3sub2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.2.2"))));
    node3sub2->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.2.3"))));
    Node3->addChild(node3sub2);
    for(int iChild=0; iChild<node3sub2->childCount(); ++iChild)
        for(int i=1; i<lstheadrs.length(); i++)
            node3sub2->child(iChild)->setCheckState(i,Qt::Unchecked);
 
    QTreeWidgetItem *node3sub3 = new QTreeWidgetItem(Node3, QStringList(QObject::tr("3.3")));
    node3sub3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.3.1"))));
    node3sub3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.3.2"))));
    node3sub3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.3.3"))));
    Node3->addChild(node3sub3);
    for(int iChild=0; iChild<node3sub3->childCount(); iChild++)
        for(int i=1; i<lstheadrs.length(); i++)
            node3sub3->child(iChild)->setCheckState(i,Qt::Unchecked);
 
 
    Node3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.4"))));
    Node3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.5"))));
    Node3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.6"))));
    Node3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.7"))));
    Node3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.8"))));
    Node3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.9"))));
    Node3->addChild(new QTreeWidgetItem(QStringList(QObject::tr("3.10"))));
 
    pTree->expandItem(Node3);
    for(int iChild=0; iChild<Node3->childCount() ; iChild++)
        for(int i=1; i<lstheadrs.length(); i++)
            Node3->child(iChild)->setCheckState(i,Qt::Unchecked);
 
    lstWidgets.append(Node3);
    lstWidgets.append(node3sub1);
    lstWidgets.append(node3sub2);
    lstWidgets.append(node3sub3);
     //==========================================================================================================//
    QTreeWidgetItem *node4 = new QTreeWidgetItem(pTree, QStringList(QObject::tr("4")));
    node4->addChild(new QTreeWidgetItem(QStringList(QObject::tr("4.1"))));
    node4->addChild(new QTreeWidgetItem(QStringList(QObject::tr("4.2"))));
    pTree->expandItem(node4);
    for(int iChild=0; iChild<node4->childCount() ; iChild++)
        for(int i=1; i<lstheadrs.length(); i++)
            node4->child(iChild)->setCheckState(i,Qt::Unchecked);
 
    lstWidgets.append(node4);
     //==========================================================================================================//
    QTreeWidgetItem *node5 = new QTreeWidgetItem(pTree, QStringList(QObject::tr("5")));
    node5->addChild(new QTreeWidgetItem(QStringList(QObject::tr("5.1"))));
    node5->addChild(new QTreeWidgetItem(QStringList(QObject::tr("5.2"))));
    node5->addChild(new QTreeWidgetItem(QStringList(QObject::tr("5.3"))));
    node5->addChild(new QTreeWidgetItem(QStringList(QObject::tr("5.4"))));
    pTree->expandItem(node5);
    for(int iChild=0; iChild<node5->childCount() ; iChild++)
        for(int i=1; i<lstheadrs.length(); i++)
            node5->child(iChild)->setCheckState(i,Qt::Unchecked);
 
    lstWidgets.append(node5);
}