[Qt-interest] How to reverse the order of the rows in a QTableWidget

[Malyushytsky, Alex]

If you need reversing, not sorting you can do it without temporary storage by:
1. Create loop from 0 to ½ of number of rows.
2. Determine which pair of rows  you want to swap data row, row2 ( 0 , numRows()-1  for example)
3. For each column ( loop by columns) use takeItem to remove both cell items from table:
       Look in documentation for QTableWidgetItem * QTableWidget::takeItem ( int row, int column )
4. now you have set items you already took out from the QTableWidget with
        void QTableWidget::setItem ( int row, int column, QTableWidgetItem * item )

But if you really want sorting I would suggest you to look at the sorting feature instead.

Regards,
   Alex


From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Bijay Panda
Sent: Thursday, September 16, 2010 9:26 PM
To: QT Interest List
Subject: [Qt-interest] How to reverse the order of the rows in a QTableWidget

Hi All,

I am working on QT 4.5.2 on linux.I want to reverse the order of rows in my QTableWidget on a pushButton click outside the QTableWidget   ( means 1-10 to 10-1).This is the ay I am doing..But its not working..Actually it's unable to remove the cellWidget.

  connect(m_pcBtnReverse,SIGNAL(clicked(bool)),this,SLOT(reverseRouteOnClick(bool)));

  bool RoutesGUI::reverseRouteOnClick(bool bIndex_)
  {
    /*Reverses order of rows i.e set the item in descending if its in ascending order*/
    int usiRowCount = m_pcTblInput->rowCount();

    int usiCol = 2;

    /*Gets the contents of all the row from GUI table by passing the total row number and coloumn number*/
    char*** pppchRows = (char***)calloc (usiRowCount, sizeof(char**));

    /*Get all the records from GUI table*/
    for( int i = m_pcTblInput->rowCount()-1;i>= 0;i--)
    {
        pppchRows[i] = getRow(i);
    }

    /*Remove all the cell widget from GUI table*/
    for( int i = m_pcTblInput->rowCount()-1; i >= 0;i--)
    {
        for( int j = 0;j< 2;j++)
        { cout<<"Removing cellwidget:"<<endl; m_pcTblInput->removeCellWidget(i, j); }

    }

    /*Set items in reverse order into the table*/
    for( int i = 0;i< m_pcTblInput->rowCount();i++)
    {
        QTableWidgetItem* pcTblItem;

        for( int j = 0;j< 2;j++)
        {
            cout<<"GUI::reverseRouteOnClick : row : "<< i <<" and column : "<< j <<"  is : " << pppchRows[i][j]<<endl;
            /*Set the item to Table for column 0 and 1 */
            pcTblItem = new QTableWidgetItem (tr(pppchRows[i][j]));
            m_pcTblInput->setItem(i, j, pcTblItem);

        }
    }
}


Any help is appreciated.Thanx in advace

--
Best Regards

Bijay Kumar Panda
Mob-9739591816



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