Pass value to Dialog/set Values

nicmorais

Hello.
So, my MainWindow opens a Dialog window whenever a button is clicked.
I need to pass an integer value to the Dialog window from the MainWindow, then, the Dialog window will make a database query with that int value to fill its QLineEdit Widgets.
I've been trying to pass such value, but I had no success so far.
Also, there's no problem if the QLineEdit texts are previously set in the MainWindow before the execution.

SGaist

Hi and welcome to devnet,

You should show the code you are currently using.

nicmorais

Hello @SGaist
Ok, there is:

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include<QtSql>
#include <QPushButton>
#include "secdialog.h"
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:

    void on_editClientBtn_clicked();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include <secdialog.h>
#include "dbConnection.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{

    ui->setupUi(this);

    dbConnection db;
    db.startdb();

}

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

void MainWindow::on_clientsTable_doubleClicked(const QModelIndex &tableIndex)
{
    QString selectedClientId = tableIndex.sibling(tableIndex.row(), 0).data().toString();
    selectedClientId.toInt();

}

void MainWindow::on_editClientBtn_clicked()
{
    SecDialog secdialog;
    secdialog.setModal(true);
    secdialog.exec();
}

secdialog.h

#ifndef SECDIALOG_H
#define SECDIALOG_H

#include <QDialog>
#include "dbConnection.h"


namespace Ui {
class SecDialog;
}

class SecDialog : public QDialog
{
    Q_OBJECT

public:
    QSqlDatabase db=QSqlDatabase::database();

    explicit SecDialog(QWidget *parent = nullptr);
    ~SecDialog();

private:
    Ui::SecDialog *ui;
};
#endif

secdialog.cpp

#include "secdialog.h"
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QString>
#include "mainwindow.h"


SecDialog::SecDialog(QWidget *parent) : QDialog(parent),
  ui(new Ui::SecDialog)

{
    ui->setupUi(this);
}

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

I know how to bind values and make queries , but i did not paste that part in this topic because that would make the code blocks too long...

JonB

Make your QString selectedClientId a member variable in MainWindow, so it is available outside on_clientsTable_doubleClicked.

In on_editClientBtn_clicked pass the selectedClientId as a parameter to secdialog creation.

Make SecDialog constructor accept this selectedClientId parameter, and use it for your database query.

Or you can have SecDialog define a getter/setter for the clientId instead of doing it via constructor parameter if you prefer.

nicmorais

Thanks @JonB. Could you please guide me a little bit further on how to do it? I'm new to Qt and C++.
So, I will put QString selectedClientId in the mainwindow.h file, right? And how can I make SecDialog accept that parameter? I remember trying something like that, but couldn't get it done.

mainwindow.h

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

QString selectedClientId; //like this?

JonB

@nicmorais

public:
QString selectedClientId; //like this?

Yes, like you have it. Though better in private: section, no need for it to be public. That makes it a member variable, so when you set it in on_clientsTable_doubleClicked() it is available outside.

You can leave the SecDialog secdialog where it was in on_editClientBtn_clicked, that does not need to be a member variable. But add a parameter to SecDialog like:

SecDialog::SecDialog(QString clientId, QWidget *parent) : QDialog(parent),

(Best const QString &clientId, but I didn't want to lay too much on you.) Do whatever you need to in that constructor with the passed-in clientId, like using it in a query or saving it as a member variable there if you need it later than in the constructor.

In on_editClientBtn_clicked create it like

    SecDialog secdialog(selectedClientId, this);
    secdialog.exec();

nicmorais

Wow! Thank you @JonB, this solved my issue. One more solved topic to the forum.
Have a nice a nice day!