[Qt-interest] can't delete QStandardItem buffer after insert in QStandardItemModel

[wya]

Hi,

progrI use QTreeView  and QStandardItemModel to display dynamic row items,
if the rows more than 100,function will delete first row  and add one row at
last postion.

Let QTreeView always display 100 rows.

 I found the memory size raise even if I deleted the list QStandardItem* in
the rows.

It seems  function "removeFirstRow()" not remove the QStandardItem's buffer
which allocated in the function "addItem()".

I want understand why I can't free QStandardItem buffer in the
removeFirstRow.

Any  comment.welcome.



The simple code is follwoing:

/////////////////////////////////////////////////////////////////////
// init the tree and QStandardItemModel
void YTraceList::init()
{
QTreeView *m_treeView= new QTreeView(this);
  m_treeView->setModel(m_proxyModel);
// add column
    m_itemModel=new QStandardItemModel(0, 7, this);

    m_itemModel->setHeaderData(i++, Qt::Horizontal, QObject::tr("Time"));
    m_itemModel->setHeaderData(i++, Qt::Horizontal, QObject::tr("Chn"));
    m_itemModel->setHeaderData(i++, Qt::Horizontal, QObject::tr("ID"));
    m_itemModel->setHeaderData(i++, Qt::Horizontal, QObject::tr("Name"));
    m_itemModel->setHeaderData(i++, Qt::Horizontal, QObject::tr("Dir"));
    m_itemModel->setHeaderData(i++, Qt::Horizontal, QObject::tr("DLC"));
    m_itemModel->setHeaderData(i++, Qt::Horizontal, QObject::tr("Data"));



  m_treeView->setModel(m_itemModel);
}
....
.......
///////////////////////////////////////////////////////////////////////////////
// here I append the rows

    void YTraceList::addItem( QStringList & lists)
{

    //model->insertRow(0);
    QList<QStandardItem*> itemLits;
    QStandardItem *tmp;

    for (int i=0;i< 7; i++)
    {
   tmp=new QStandardItem( lists.at(i) );
   itemLits.append( tmp);
    }

 m_itemModel->appendRow(itemLits);

}

///////////////////////////////////////////////////////////////////////////////////
// here I remove one row.but memery continue raise

void YTraceList::removeFirstRow()
{

    int i=0;
  int rows= m_itemModel->rowCount();
    QList<QStandardItem*> itemList;
    QStandardItem *tmp;

for(int j=0;j<rows;j++)
{


    itemList=m_itemModel->takeRow(0);

    for(i=0; i<itemList.size();i++)
    {

     tmp= itemList.at(i);
         if( tmp !=NULL)
         {

           delete tmp;
           tmp =NULL;
         }
    }

}

}



wya

20. Nov. 2010
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