Take in multiple user input values using Qt QTableWidget

Question

I'm trying to make a basic UI for taking in user input and displaying the output, using Qt. I just started working with UIs, so this might seem trivial. I have to take in 3 sets of inputs, where each set consists of 90 integer values. Think of each set as a 2d array of 30 by 3. I'm trying to see what the best way to handle this user input would be in Qt. I have used Qt to work on a .ui file and the link below is of a screenshot of what it should look like.

https://i.stack.imgur.com/KedP7.png

To be more specific, I have used the QTableWidget to create the table itself. My question now is how do I access user input from each cell of the table and store it into an array for that whole table?

Help will be appreciated.

Thanks!

score 1 · Answer 1 · answered Feb 22 '15 at 22:43

QTableWidget::item(int row, int column) returns the item at position (row, column). Row can be between 0 and QTableWidget::rowCount() – 1, column between 0 and QTableWidget::columnCount() – 1

QTableWidgetItem::text() returns the items text.

Create a function, which reads alls items and add them to an array in a loop, connect the pressed-signal of the Enter-Button with this function.

If you only want to read updated items: the QTableWidget::itemChanged() signal sends the item, which was updated. QTableWidget::indexFromItem() returns the index of the item, so you can update your array.

score 0 · Answer 2 · edited May 23 '17 at 10:28

This might help. (I dont have the privilege to comment):

I use a help_index which basically numbers the elements from left to right. Everytime a cell is edited (return pressed) the next element is selected (the +1 in the help_index line). If the last index is reached i focus the OK button.

You might read data at:

Input time (test_STR1)
The OK button is pressed (test_STR2 Set the auto default on the button: How to make a QPushButton pressable for enter key?)

Tab Function:

    void MainWindow::on_tableWidget_cellChanged(int row, int column)
    {
        QString test_STR1 = ui->tableWidget->item(row,column)->text();   // is string
        qDebug(QString("OnCell %1,%2:%3").arg(column).arg(row).arg(test_STR).toLatin1());
        // EG int array[rows][columns];
        // QList<QStringList<QString>>  (equivalent to: QList<QList<QString>>)
        int columncount , rowcount, help_index,nextRow, nextColimn;
        columncount = ui->tableWidget->columnCount();
        rowcount = ui->tableWidget->rowCount();
        help_index = column + row*columncount +1;
        if(help_index < columncount*rowcount)
        {
            nextRow = help_index / columncount;
            nextColimn = help_index % columncount;
            ui->tableWidget->setCurrentCell(nextRow,nextColimn);
        }
        else
        {
            ui->pushButton_OK->setFocus();
        }
    }

Ok_button:

void MainWindow::on_pushButton_OK_clicked()
{
    for(int i=ui->tableWidget->columnCount()-1;i>=0;i--)
        for(int j=ui->tableWidget->rowCount()-1;j>=0;j--)
        {
            QString test_STR2 = ui->tableWidget->item(j,i)->text();
            qDebug(QString("OnOk %1,%2:%3").arg(i).arg(j).arg(test_STR).toLatin1());
        }

}

Take in multiple user input values using Qt QTableWidget

2 Answers2