How can i add new row to the existing Qtablewidget?

[srikanth]

Problem in getting mouseEvent on QTableWidget, this code is to create a window with tabelwidget and mouseclickevent, when i click right button of mouse the i got two actin event options named add and delete, i want to add new rows with 3 columns when i click "add" event function,and delete the last row when i click on "delete" event function,

(sorry for my english), any help is appreciated.

#include "notepad.h"
   #include <QMessageBox>
   #include <QTableView>
   #include <QMouseEvent>

   Notepad::Notepad() 
   {

        test() ;

       add_action = new QAction(tr("Add cell"), this);
       add_action->setIcon(QIcon("add.jpg"));
       Delete_action = new QAction(tr("Delete cell"), this);
       Delete_action->setIcon(QIcon("delete.jpg"));

       connect(Delete_action, SIGNAL(triggered()), this, SLOT(Delete()));
       connect(add_action, SIGNAL(triggered()), this, SLOT(add()));

       centralWidget()->setAttribute(Qt::WA_TransparentForMouseEvents);
       centralWidget()->setAttribute(Qt::WA_MouseTracking,true);

       setMouseTracking(true);

   }
   void Notepad::test() 
   {       
       QTableWidget* table = new QTableWidget();
       QTableWidgetItem* tableItem = new QTableWidgetItem();

       table->setRowCount(1);
       table->setColumnCount(3);
       table->setItem(0,0,new QTableWidgetItem());
       table->setItem(0,1,new QTableWidgetItem());
       table->setItem(0,2,new QTableWidgetItem());

       table->setMouseTracking(true);
       table->viewport()->setMouseTracking(true);
       table->installEventFilter(this);
       table->viewport()->installEventFilter(this);

       table->setSelectionBehavior(QAbstractItemView::SelectRows);
       table->setSelectionMode(QAbstractItemView::SingleSelection);

       tableItem->setFlags(tableItem->flags() ^ Qt::ItemIsEditable);
       table->setSizePolicy(QSizePolicy::Expanding,QSizePolicy::Expanding);
       setCentralWidget(table);


   }

   void Notepad::mouseReleaseEvent (QMouseEvent * event )
   {   


       QMessageBox* msgBox;
       if(event->button() == Qt::RightButton)
         {
   QMouseEvent *mouseEvent = static_cast<QMouseEvent*> (event);
          QMenu *menu = new QMenu(this);
          menu->addAction(add_action);
          menu->addAction(Delete_action);
          menu->exec(mouseEvent->globalPos());

       } 
   }
   void Notepad::add() 
   {
       QTableWidget* table = new QTableWidget();
       test();

       table->setColumnCount(3);*/


       int newRow = table->rowCount();
       int newcol = table->columnCount();
       qDebug() << newRow;  
       for (int row ; row < newRow+1 ; ++row)
       {
           QWidget *parent;
           QStyleOptionViewItem option;
           for (int column = 0; column < 3; ++column)
           {

           table->insertRow( table->rowCount());
           table->insertColumn( newcol );
           }
       }

       setCentralWidget(table);
       centralWidget()->setAttribute(Qt::WA_TransparentForMouseEvents);
       setMouseTracking(true);
   }
   void Notepad::Delete() 
   {
       QTableWidget* table = new QTableWidget();

       add();

       int row=table->rowCount();


   if (int i= row){
       table->removeRow(i);

   }
       setCentralWidget(table);
       centralWidget()->setAttribute(Qt::WA_TransparentForMouseEvents);
       setMouseTracking(true);
   }

[mrjj]

Hi
First of all, you should keep the same tablewidget so
QTableWidget* table = new QTableWidget();
should not be done in a function.
so

QTableWidget* table; --- > to live in mainwindow.h , as a class member

and
table = new QTableWidget(); -- > in mainwin constructor.

Then use "table" in all functions.

(easier way, simply use Designer and just place it. it can then be used with ui->tablewidget)

so short story is that:
void Notepad::Delete()
{
QTableWidget* table = new QTableWidget(); << looks wrong as u make new one

so i think moving the table to a class member will help you alot.

Remember when you add a new "row" , to set
table->setRowCount(1); << should be increased

[srikanth]

@mrjj how can i add rows and delete rows , please help me

[mrjj]

@srikanth

You add with

   QTableWidgetItem* tableItem = new QTableWidgetItem();
   http://doc.qt.io/qt-5/qtablewidget.html#insertRow

   table->setItem(0,row,new QTableWidgetItem());

and delete with
http://doc.qt.io/qt-5/qtablewidget.html#removeRow

Please see
http://doc.qt.io/qt-5/qtablewidget.html

[srikanth]

@mrjj thanks a lot. solved

[Umer]

@mrjj How to add and delete rows in table by clicking spinbox up and down arrow? Please help me through python code.