Qt - Adding data to a TableWidget via another TableWidget - c++

Question

I am stuck on a certain problem with table widgets and I am in need of help. Basically, I am trying to get a table widget on a dialogue screen to get the information inside of it and then fill that information on to another table widget on a main window screen. So, when I click the OK button, it should take the text from one table widget and place it in the other table widget. I tried using the below code, and the build ran. But, as soon as I clicked OK, the program crashed. The table called TableWidgetedit is the table I am trying to copy from and send to the table in the mainwindow, named tablewidget. (just to make so I am not vague, I am trying to copy data from the one table and place it in another table, when a user clicks on the OK button.)
int rows = 6;
int columns = 5;
Ui::MainWindow *mainui;
void EditMode1::on_pushButton_clicked()
{
for (int i = 0; i<columns;++i){
for (int j = 0;j<rows;++j){
QTableWidgetItem *celltxt= TableWidgetedit.item(j,i);
mainui->tableWidget->setItem(j,i,celltxt);
}
}
}
Any and all help is appreciated. Thank you!
(I am a not the best with Qt so if you don't mind explaining what changes you have made and why, that would a great help thank you!).
-UPDATE-
#Jeet here are the code for what im trying to do:
tablemainwindow1.h:
#ifndef TABLEMAINWINDOW1_H
#define TABLEMAINWINDOW1_H
#include <QMainWindow>
#include "tabledialougewindow.h"
namespace Ui {
class TableMainWindow1;
}
class TableMainWindow1 : public QMainWindow
{
Q_OBJECT
public:
explicit TableMainWindow1(QWidget *parent = 0);
~TableMainWindow1();
private slots:
void on_pushButton_clicked();
private:
Ui::TableMainWindow1 *ui;
TableDialougeWindow *tbl2;
};
#endif // TABLEMAINWINDOW1_H
tablemainwindow1.cpp:
#include "tablemainwindow1.h"
#include "ui_tablemainwindow1.h"
TableMainWindow1::TableMainWindow1(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::TableMainWindow1)
{
ui->setupUi(this);
ui->tableWidget->setRowCount(3);
ui->tableWidget->setColumnCount(3);
}
TableMainWindow1::~TableMainWindow1()
{
delete ui;
}
void TableMainWindow1::on_pushButton_clicked()
{
tbl2 = new TableDialougeWindow(this);
tbl2->show();
}
tabledialougewindow.h:
#ifndef TABLEDIALOUGEWINDOW_H
#define TABLEDIALOUGEWINDOW_H
#include <QDialog>
namespace Ui {
class TableDialougeWindow;
}
class TableDialougeWindow : public QDialog
{
Q_OBJECT
public:
explicit TableDialougeWindow(QWidget *parent = 0);
~TableDialougeWindow();
private slots:
void on_buttonBox_accepted();
private:
Ui::TableDialougeWindow *ui;
};
#endif // TABLEDIALOUGEWINDOW_H
tabledialougewindow.cpp:
#include "tabledialougewindow.h"
#include "ui_tabledialougewindow.h"
#include "tablemainwindow1.h"
#include "ui_tablemainwindow1.h"
int Rows = 3;
int Columns = 3;
Ui::TableMainWindow1 *mainui;
TableDialougeWindow::TableDialougeWindow(QWidget *parent) :
QDialog(parent),
ui(new Ui::TableDialougeWindow)
{
ui->setupUi(this);
ui->tableWidget->setRowCount(Rows);
ui->tableWidget->setColumnCount(Columns);
}
TableDialougeWindow::~TableDialougeWindow()
{
delete ui;
}
void TableDialougeWindow::on_buttonBox_accepted()
{
for(int i = 0;i<Columns;++i){
for(int j = 0;j<Rows;++j){
QTableWidgetItem *celltxt = ui->tableWidget->item(j,i);
QTableWidgetItem *celltxt2 =new QTableWidgetItem(*celltxt);
mainui->tableWidget->setItem(j,i,celltxt2);
}
}
accept();
}
hope this helps.

Answer 1

The error is we cannot insert an item that is already owned by another QTableWidget. So before make a copy we need to clone the data. we can use copy constructor to achieve this. Code comment will explain in detail. Hope this help.
void MainWindow::on_cmdTransfer_clicked()
{
//Source Table
int rows = ui->tbl1->rowCount();
int columns =ui->tbl1->columnCount();
//Destination Table
ui->tbl2->setColumnCount(columns);
ui->tbl2->setRowCount(rows);
//Copy data form one table to another.
for (int i = 0; i<columns;++i){
for (int j = 0;j<rows;++j){
QTableWidgetItem *celltxt= ui->tbl1->item(j,i);
//Clone the data using copy constructor
QTableWidgetItem *celltxt1=new QTableWidgetItem(*celltxt);
ui->tbl2->setItem(j,i,celltxt1);
}
}
}