Autoupdate cell content

jss193

Hello

I have created a tablewidget where values in rows are set from Qlineedit by pressing a button, but, once app is open everything works well, what if I edit content into a cell and I wanna it to be updated.

For instance, I first introduced in a cell a value "John" and then when app is running I change it to "Phil", it changes (on view) but it really doesnt, is it possible to make it change dynamically when app is running? I guess that I must do a Qevent to do it, but dont know exactly if it is correct nor how to do it.

Could you please help me?

Thanks in advance

SGaist

Hi,

Can you show the code you are using for that ?

jss193

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

    QString name()const;
    int age()const;
    double salary()const;

private slots:
    void on_add_clicked();

private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

and

#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    QStringList titles;
   
    ui->tableWidget->setColumnCount(3);
    titulos<<"name"<<"age"<<"salary";
    ui->tableWidget->setHorizontalHeaderLabels(titles);

    qApp->processEvents();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_add_clicked()
{

    ui->tableWidget->insertRow(ui->tableWidget->rowCount());
    ui->tableWidget->setItem(ui->tableWidget->rowCount()-1,0,new QTableWidgetItem(name()));
    ui->show_name->setText(ui->tableWidget->item(0,0)->text()) ;

}

QString MainWindow::nombre()const{
    return ui->name->text();
}
int MainWindow::edad()const{
    return ui->age->value();
}
double MainWindow::salario()const{
    return ui->salary->value();
}

SGaist

There's no need for qApp->processEvents(); in your constructor.

Can you explain the exact steps you are using and what you are expecting from your widget ?

jss193

I run the app, then I introduce a name and it is automatically shown in cell on tablewidget (in this case position 0,0), and this value is shown in a label. This works as I want.

Then I do double click on cell 0,0 and edit it (while app running) and press enter, then, the label doesnt change to its new value, what I wish is to edit this cell while app is running by editing it manually by double click and writing on that cell.

Thank you!

SGaist

There's no reason for it to change. There's no connection between your QTableWidget and QLineEdit.

jss193

Yes, I know this code will never do what I want, but how could I do it?

Thanks

mrjj

@jss193
Hi
You can connect
~~https://doc.qt.io/qt-5/qlistwidget.html#itemChanged~~
https://doc.qt.io/qt-5/qtablewidget.html#itemChanged
to a slot / lambda and when its called, take it items text and
set it on the label.

like
connect(ui->tableWidget, &QTableWidget::itemChanged, this, &MainWindow::updateLabel);
(in ctor)

then define slot in .h

class MainWindow : public QMainWindow
{
    Q_OBJECT
private slots:
    void updateLabel(QTableWidgetItem *item);
........

and in .cpp

void MainWindow::updateLabel(QTableWidgetItem *item)
{
    if (item) {        
        ui->label->setText(item->text());
    }
}

this will update label with any cell so you might want to add a check with
item->column() to only do it for some cells.

jss193

Fixed,
Thank you very much!