Sending parameters with click event

[yy_pc_programmer]

Hello, my codes are below.
I want to send a parameter to the addpage class when a click event is triggered. How can I do that? Thanks
mainpage.h file:

#ifndef MAINPAGE_H
#define MAINPAGE_H

#include "giriswidget.h"
#include "btnitemdelegate.h"
#include "addpage.h"
#include "detailpage.h"
#include "update.h"
#include <QDialog>
#include <QTableView>
#include <QSql>
#include <QSqlDatabase>
#include <QSqlQueryModel>
#include <QSqlQuery>
#include <QStandardItemModel>
#include <QPushButton>
#include <QModelIndex>

namespace Ui {
class MainPage;
}

class MainPage : public QDialog
{
    Q_OBJECT

public:
    explicit MainPage(QWidget *parent = nullptr);
    ~MainPage();
    void connectDb();


    void updateTableView();
    void myview_stil_layout();

public slots:
    void updateBtnClickedSlot(const QModelIndex &mindex);
    void deleteBtnClickedSlot(const QModelIndex &mindex);
    //void addBtn_Page_Clicked(); //addpage
    void sendParameterToAddPage(QModelIndex &mindex);
    void detailBtn_Page_Clicked();
    void clickedLogOutBtn_Clicked();
    //int sevkHesaplama();

public:
    Ui::MainPage *ui;

    //AddPage *addpg;
    DetailPage *detail;
    QSqlDatabase mydb;
    QSqlQueryModel *queryModel;
    QSqlQueryModel *queryModelDelete;
    QStandardItemModel *itemModelBtn;
    QPushButton *deleteBtn;
    QPushButton *updateBtn;
    const int ID={};
    int objID;
};

#endif // MAINPAGE_H

mainpage.cpp file:

#include "mainpage.h"
#include "ui_mainpage.h"
#include "giriswidget.h"
#include "btnitemdelegate.h"
#include "addpage.h"
#include "detailpage.h"
#include "update.h"
#include <QMessageBox>
#include <QDebug>
#include <QSqlError>
#include <QHeaderView>
#include <QSqlQueryModel>
#include <QStringList>
#include <QWidget>
#include <QModelIndex>
#include <QObject>

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

    connectDb();

    updateTableView();

    connect(ui->logOutBtn,&QPushButton::clicked,this,&MainPage::clickedLogOutBtn_Clicked);

    AddPage *m_addPg = new AddPage(objID);

    connect(m_addPg,&AddPage::add_Data_Clicked,this,&MainPage::addBtn_Page_Clicked);

    connect(ui->detailBtn,&QPushButton::clicked,this,&MainPage::detailBtn_Page_Clicked);

    btnItemDelegate *btnDlgte = new btnItemDelegate("delete",ui->myView);
    btnItemDelegate *btnUpdate = new btnItemDelegate("guncelle",ui->myView);

    connect(btnDlgte, &btnItemDelegate::clickedDeleteBtnSignal, this, &MainPage::deleteBtnClickedSlot);
    connect(btnUpdate, &btnItemDelegate::clickedUpdateBtnSignal,this, &MainPage::updateBtnClickedSlot); //updatePage

    detail = new DetailPage();

    queryModel->insertColumn(queryModel->columnCount());
    queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Sil"));

    ui->myView->setItemDelegateForColumn(queryModel->columnCount()-1,btnDlgte); //ok

    queryModel->insertColumn(queryModel->columnCount());

    queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Güncelle"));

    ui->myView->setItemDelegateForColumn(queryModel->columnCount()-1,btnUpdate); //ok

    ui->myView->setSelectionBehavior(QAbstractItemView::SelectItems);
    ui->myView->setModel(queryModel);
}

void MainPage::connectDb()
{
    mydb = QSqlDatabase::addDatabase("QMYSQL");

    mydb.setHostName("localhost");
    mydb.setDatabaseName("krn_iplikler");
    mydb.setUserName("root");
    mydb.setPassword("root");
    mydb.setPort(3306);
    mydb.open();

    if (mydb.isOpen())
    {
        qDebug()<<"db connection is succesfully";
    }
    else {
        QMessageBox::information(this,"Connection Failed.!","Database connection failed!!!!",QMessageBox::Cancel);
        qDebug()<<mydb.lastError().text();
    }
}

void MainPage::addBtn_Page_Clicked()
{
    sendParameterToAddPage(mindex);
}

void MainPage::sendParameterToAddPage(QModelIndex &mindex) //addpage sınıfına parametre gönderme
{
    if (mindex.isValid())
    {
        int rowIndex = mindex.row();
        qDebug() << "ekle butonu tıklandı. indeksi: " << rowIndex;

        auto objID = queryModel->data(queryModel->index(rowIndex, 0), Qt::DisplayRole).toInt();
        AddPage *addpag = new AddPage(objID);
        connect(addpag , &AddPage::veriEklendi,this,[=](){
            qDebug()<<"tabloya eklendi";
            queryModel->setQuery("SELECT * FROM iplikler",mydb);
            queryModel->insertColumn(queryModel->columnCount());
            queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Sil"));
            queryModel->insertColumn(queryModel->columnCount());
            queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Güncelle"));
            ui->myView->setModel(queryModel);
            QHeaderView *horizontalHeader = ui->myView->horizontalHeader();
            horizontalHeader->setResizeContentsPrecision(QHeaderView::ResizeToContents);
        });
        addpag->setModal(true);
        addpag->setWindowTitle("Add Page");
        addpag->setWindowIcon(QIcon(":/icon/icons/add.png"));
        addpag->setWindowFlags( Qt::WindowMinimizeButtonHint);
        addpag->adjustSize();
        addpag->setFixedSize(1000,150);
        addpag->show();
    }else {
        qDebug()<<"addpage error index";
    }
}

void MainPage::detailBtn_Page_Clicked()
{
    detail->setWindowTitle("Details Page");
    detail->setWindowIcon(QIcon(":/icon/icons/detail.png"));
    detail->setWindowFlags( Qt::WindowMinimizeButtonHint | Qt::WindowCloseButtonHint);
    detail->setModal(true);
    detail->adjustSize();
    detail->setFixedSize(600,400);
    detail->show();
}

void MainPage::clickedLogOutBtn_Clicked()
{
    this->close();
    GirisWidget *giris = new GirisWidget();
    giris->setWindowTitle("Login Page");
    giris->adjustSize();
    giris->setFixedSize(450,350);
    giris->setWindowIcon(QIcon(":/icon/icons/login.png"));
    giris->setWindowFlags( Qt::WindowMinimizeButtonHint | Qt::WindowCloseButtonHint);
    giris->show();
}

void MainPage::updateTableView()
{
    queryModel = new QSqlQueryModel();
    queryModel->setQuery("SELECT * FROM iplikler",mydb);

    ui->myView->setModel(queryModel);

    myview_stil_layout();
}

void MainPage::myview_stil_layout()
{
    if (!queryModel)
    {
        return;
    }

    QStringList headernames;
    headernames <<"Sıra No"<<"Boyanan Miktar"<<"Cari Kodu"<<"Cari Adı"<<"Depodan Rezerv"
                <<"İplik Kodu"<<"İplik Adı"<<"Miktar"<<"Onay Zamanı"<<"Özel Notu"<<"Renk Kodu"<<"Renk Adı"<<"Sevk Edilecek Miktar"<<"Sevk Miktarı";

    for (int i = 0; i < headernames.size(); ++i) {
        queryModel->setHeaderData(i, Qt::Horizontal, headernames[i]);
    }

    ui->myView->setStyleSheet("QHeaderView::section { background-color: lightblue ; color: black; font-weight: bold;}");
    ui->myView->setModel(queryModel);

    ui->myView->verticalHeader()->setVisible(false);

    QHeaderView *horizontalHeader = ui->myView->horizontalHeader();
    horizontalHeader->setResizeContentsPrecision(QHeaderView::ResizeToContents);
}

void MainPage::updateBtnClickedSlot(const QModelIndex &mindex)
{
    if (mindex.isValid())
    {
        int rowIndex = mindex.row();
        qDebug() << "Güncelle butonuna tıklandı. Satır indeksi: " << rowIndex;

        auto itemID = queryModel->data(queryModel->index(rowIndex, 0), Qt::DisplayRole).toInt();
        Update *update = new Update(itemID); //id ve model i update e iletme
        connect(update , &Update::verilerGuncellendi,this,[=](){
            qDebug()<<"tablo guncellendi";
            queryModel->setQuery("SELECT * FROM iplikler",mydb);
            queryModel->insertColumn(queryModel->columnCount());
            queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Sil"));
            queryModel->insertColumn(queryModel->columnCount());
            queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Güncelle"));
            ui->myView->setModel(queryModel);
            QHeaderView *horizontalHeader = ui->myView->horizontalHeader();
            horizontalHeader->setResizeContentsPrecision(QHeaderView::ResizeToContents);
        });
        update->setWindowTitle("Update Page");
        update->setWindowIcon(QIcon(":/icon/icons/updatepage.png"));
        update->setWindowFlags( Qt::WindowMinimizeButtonHint | Qt::WindowCloseButtonHint);
        update->setModal(true);
        update->setFixedSize(1000,150);
        update->show();
    }else {
        qDebug()<<"error index";
    }
}

void MainPage::deleteBtnClickedSlot(const QModelIndex &mindex)
{
    if (mindex.isValid())
    {
        int rowIndex = mindex.row();
        qDebug() << "delete butonuna tıklandı. indeksi: " << rowIndex;

        QModelIndex modelIndex = queryModel->index(rowIndex,0);
        int ID = queryModel->data(modelIndex,Qt::DisplayRole).toInt();

        QSqlQuery deleteQuery;
        deleteQuery.prepare("DELETE FROM iplikler WHERE ID = :ID ");
        deleteQuery.bindValue(":ID",ID);

        if (deleteQuery.exec()) {
            qDebug()<<"veri silindi";
            queryModel->setQuery("SELECT * FROM iplikler",mydb);
            queryModel->insertColumn(queryModel->columnCount());
            queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Sil"));
            queryModel->insertColumn(queryModel->columnCount());
            queryModel->setHeaderData(queryModel->columnCount()-1, Qt::Horizontal, tr("Güncelle"));
            ui->myView->setModel(queryModel);
        }
        else{
            qDebug() << "Satır silinirken hata oluştu:" << deleteQuery.lastError().text();
        }
    }else {
        qDebug()<<"error index";
    }
}

/*int MainPage::sevkHesaplama()
{
}*/

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

addpage.h file:

#ifndef ADDPAGE_H
#define ADDPAGE_H

#include <QDialog>
#include <QSqlQuery>
#include <QSqlQueryModel>

namespace Ui {
class AddPage;
}

class AddPage : public QDialog
{
    Q_OBJECT

public:
    explicit AddPage(int objID, QWidget *parent = nullptr);
    ~AddPage();

    bool lnedit_cntrl();
    void add_Data_Clicked();
    bool insertData(const QString &tablename,const QMap<QString, QString>& iplikData);
    void iptalBtn_clicked();

signals:
    void addData();
    void veriEklendi();

private:
    Ui::AddPage *ui;
    QSqlQueryModel *myQueryModel;
    QSqlQueryModel *queryModel;
    QSqlQuery *myQuery;
    int n_ID;
};

#endif // ADDPAGE_H

addpage.cpp file:

#include "addpage.h"
#include "ui_addpage.h"
#include <QDebug>
#include <QMessageBox>
#include <QSqlError>
#include <QHeaderView>

AddPage::AddPage(int objID, QWidget *parent) :
    QDialog(parent),
    n_ID(objID),
    ui(new Ui::AddPage)
{
    ui->setupUi(this);

    myQueryModel = new QSqlQueryModel();
    myQuery = new QSqlQuery();

    connect(ui->kaydetBtn,&QPushButton::clicked,this,&AddPage::add_Data_Clicked);
    connect(ui->iptalBtn,&QPushButton::clicked,this,&AddPage::iptalBtn_clicked);
}

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

bool AddPage::lnedit_cntrl()
{
    QList<QLineEdit*> lineedits {ui->iplikkodLnedit,ui->ipliknameLnedit,ui->renkkodLnedit,ui->renknameLnedit,ui->carikodLnedit,ui->carinameLnedit,
                                 ui->miktarLnedit};
    for (QLineEdit *lineEdit : lineedits) {
        if (lineEdit->text().isEmpty())
        {
            QMessageBox::critical(this,"Empty.!","Data is Empty!!!");
            return false;
        }
    }

    return true;
}

bool AddPage::insertData(const QString &tableName,const QMap<QString, QString>& iplikData)
{
    QString queryString = "INSERT INTO " + tableName + " (";

    QStringList columnNames;
    QStringList valuePlaceholders;

    for (auto it = iplikData.constBegin(); it != iplikData.constEnd(); ++it)
    {
        columnNames << it.key();
        valuePlaceholders << "?";
    }

    queryString += columnNames.join(", ") + ") VALUES (" + valuePlaceholders.join(", ") + ")";
    myQuery->prepare(queryString);

    for (auto it = iplikData.constBegin(); it != iplikData.constEnd(); ++it)
    {
        myQuery->addBindValue(it.value());
    }

    bool success = myQuery->exec();

    return success;
}

void AddPage::iptalBtn_clicked()
{
    this->close();
}

void AddPage::add_Data_Clicked()
{
    auto empty = lnedit_cntrl();

    if (!empty)
    {
        QString _iplikkod = ui->iplikkodLnedit->text();
        QString _iplikname = ui->ipliknameLnedit->text();
        QString _renkkod = ui->renkkodLnedit->text();
        QString _renkname = ui->renknameLnedit->text();
        QString _carikod = ui->carikodLnedit->text();
        QString _cariname = ui->carinameLnedit->text();
        QString _miktar = ui->miktarLnedit->text();
        QString _drezerv = ui->drezervLnedit->text();
        QString _bmiktar = ui->bmiktarLnedit->text();
        QString _ozelnot = ui->ozelNot->text();

        QMap<QString, QString> iplikData;
        QString tableName = "iplikler";
        bool success = false;

        iplikData["iplikkod"] = _iplikkod;
        iplikData["iplikname"] = _iplikname;
        iplikData["renkkod"] = _renkkod;
        iplikData["renkname"] = _renkname;
        iplikData["carikod"] = _carikod;
        iplikData["cariname"] = _cariname;
        iplikData["boyamamiktar"] = _bmiktar;
        iplikData["deporezerv"] = _drezerv;
        iplikData["miktar"] = _miktar;
        iplikData["ozelnot"] = _ozelnot;

        success = insertData(tableName,iplikData);

        if(success)
        {
            emit veriEklendi();
            qDebug()<<"Veriler eklendi";
        }
        else {
            qDebug() << "Veri ekleme başarısız" << myQuery->lastError().text();
        }
    }
}

/*
    if (notEmpty)
    {
        QString _iplikkod = ui->iplikkodLnedit->text();
        QString _iplikname = ui->ipliknameLnedit->text();
        QString _renkkod = ui->renkkodLnedit->text();
        QString _renkname = ui->renknameLnedit->text();
        QString _carikod = ui->carikodLnedit->text();
        QString _cariname = ui->carinameLnedit->text();
        QString _miktar = ui->miktarLnedit->text();
        QString _drezerv = ui->drezervLnedit->text();
        QString _bmiktar = ui->bmiktarLnedit->text();
        QString _ozelnot = ui->ozelNot->text();

        QMap<QString, QString> iplikData;
        QString tableName;

        iplikData["iplikkod"] = _iplikkod;
        iplikData["iplikname"] = _iplikname;
        tableName= "iplikler";
        bool success = insertData(tableName,iplikData);
        if(!success)
        {
            qDebug() << "Veri ekleme başarısız:1 " << myQuery->lastError().text();
        }

        iplikData.clear();
        iplikData["renkkod"] = _renkkod;
        iplikData["renkname"] = _renkname;
        tableName = "iplikler";
        success = insertData(tableName,iplikData);
        if(!success)
        {
            qDebug() << "Veri ekleme başarısız:2 " << myQuery->lastError().text();
        }

        iplikData.clear();
        iplikData["carikod"] = _carikod;
        iplikData["cariname"] = _cariname;
        tableName = "iplikler";
        success = insertData(tableName,iplikData);
        if(!success)
        {
            qDebug() << "Veri ekleme başarısız:3 " << myQuery->lastError().text();
        }

        iplikData.clear();
        iplikData["boyamamiktar"] = _bmiktar;
        tableName = "iplikler";
        success = insertData(tableName,iplikData);
        if(!success)
        {
            qDebug() << "Veri ekleme başarısız:4 " << myQuery->lastError().text();
        }

        iplikData.clear();
        iplikData["deporezerv"] = _drezerv;
        tableName = "iplikler";
        success = insertData(tableName,iplikData);
        if(!success)
        {
            qDebug() << "Veri ekleme başarısız:5 " << myQuery->lastError().text();
        }

        iplikData.clear();
        iplikData["miktar"] = _miktar;
        tableName = "iplikler";
        success = insertData(tableName,iplikData);
        if(!success)
        {
            qDebug() << "Veri ekleme başarısız:6 " << myQuery->lastError().text();
        }

        iplikData.clear();
        iplikData["ozelnot"] = _ozelnot;
        tableName = "iplikler";
        success = insertData(tableName,iplikData);
        if(!success)
        {
            qDebug() << "Veri ekleme başarısız:7 " << myQuery->lastError().text();
        }

        MainPage *mainPage = qobject_cast<MainPage*>(this->parentWidget());
        if (mainPage)
        {
            mainPage->updateTableView();
        }
    }
*/

[JonB]

@yy_pc_programmer
That is hundreds of lines to ask some small question. Maybe someone else will want to look through all that code. I can say:

• If you want to pass an extra parameter to the slot connected to a signal use a C++ lambda.

// `param` holds something you want to send with the signal to the slot
connect(signalObject, &Signaller::signal, slotObject, [param]() { qDebug() << param; })'

• If you want to "pass" a parameter to a class, add formal parameter for that to class's constructor, or provide a setter method you call after creating the instance.

Otherwise you can wait to see if someone wants to look through your code to guess what you want.

[jsulm]

@yy_pc_programmer Can you please be more specific? What parameter and what click event (I guess you mean click signal?)? You can use a lambda as slot to pass any parameter you want to code you call in the lambda.

[Pl45m4]

@yy_pc_programmer said in Sending parameters with click event:

I want to send a parameter to the addpage class when a click event is triggered. How can I do that?

So AddPage is a QDialog?! (maybe you should have mentioned that, instead of posting a bunch of unrelated code)

In addition to @JonB and @jsulm :
What do you want to send? To where? And where + when does the click happen?

Edit:

After scrolling through your code, I found this

void MainPage::addBtn_Page_Clicked()
{
    sendParameterToAddPage(mindex);
}

and this

void MainPage::sendParameterToAddPage(QModelIndex &mindex){

         // ......
         AddPage *addpag = new AddPage(objID);
         // .......
         addpag->setModal(true);
         addpag->setWindowTitle("Add Page");
         addpag->setWindowIcon(QIcon(":/icon/icons/add.png"));
         addpag->setWindowFlags( Qt::WindowMinimizeButtonHint);
         addpag->adjustSize();
         addpag->setFixedSize(1000,150);
         addpag->show();

First of all, you know that you create a new AddPage dialog every time, which leaks memory (as far as I can see) and never use the AddPage *addpg; member var from your MainPage?!

If you want to pass something while you create your dialog, you can simply add a function to your dialog class.
The current way looks like bad design, esp. this in AddPage

MainPage *mainPage = qobject_cast<MainPage*>(this->parentWidget());
if (mainPage)
 {
        mainPage->updateTableView();
  }

[yy_pc_programmer]

@Pl45m4 @JonB @jsulm THANK YOU SO MUCH FOR ANSWER