[Solved] qListWidget cannot add an item dynamically

[LeeMinh]

In my Qt application, I want to add a new item dynamically into a listview. Besides I also used Signal & Slot to transfer data between forms so I have created 2 following forms:

mainwindow.h

@
class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

public slots:
void ReceivedData(QString item);

private slots:
void on_btnAdd_clicked();

void on_btnCancel_clicked();

private:
Ui::MainWindow *ui;

void SetUpListName();

};
@

addform.h

@
class AddForm : public QDialog
{
Q_OBJECT

public:
explicit AddForm(QWidget *parent = 0);
~AddForm();

signals:
void SendData(QString item);

private slots:
void on_pushButton_clicked();

void on_pushButton_2_clicked();

private:
Ui::AddForm *ui;
MainWindow *main_window;
};
@

mainwindow.cpp

@
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
SetUpListName();
}

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

void MainWindow::SetUpListName()
{
// Add 5 new elements
for (int i = 0; i < 5; i++) {
QString item = "Item " + QString::number(i);
ui->lwListItem->addItem(item);

}

}

void MainWindow::on_btnAdd_clicked()
{
// Open Add Form
AddForm add;
add.setModal(true);
add.exec();
}

void MainWindow::on_btnCancel_clicked()
{
this->close();
}

void MainWindow::ReceivedData(QString item)
{
// Check to receive data
qDebug() << "Item: " << item;

// Add a new item to list items
ui->lwListItem->addItem(item);

}
@

addform.cpp

@
AddForm::AddForm(QWidget *parent) :
QDialog(parent),
ui(new Ui::AddForm)
{
ui->setupUi(this);

main_window = new MainWindow();
connect(this, SIGNAL(SendData(QString)), main_window, SLOT(ReceivedData(QString)));

}

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

void AddForm::on_pushButton_clicked()
{
// Send data via Signal & Slot
emit SendData(ui->txtName->text());
}

void AddForm::on_pushButton_2_clicked()
{
this->close();
}
@

When I run the application, I got the data from Add form but the list view doesn't add this item.

!http://i249.photobucket.com/albums/gg220/HienBoo/send_data_list_view.png(Cannot add an item dynamically)!

Does someone have any solutions?

Thanks!
Lee

P/S: You can download my source code at "here":http://www.mediafire.com/download/9djf6bazr8b18n3/Demo.rar.

[qxoz]

Hi
in this code you create new main window, it is wrong:
addform.cpp
@main_window = new MainWindow();
connect(this, SIGNAL(SendData(QString)), main_window, SLOT(ReceivedData(QString)));@
you need connect signal and slot here:
mainwindow.cpp
@AddForm add;
add.setModal(true);
connect(&add, SIGNAL(SendData(QString)), this, SLOT(ReceivedData(QString)));
add.exec();@

[LeeMinh]

@qxoz: I have fixed this issue. Thanks for your remainder!