How to pass values from 2 differents dialogs to 1 dialog?

Eduardo12l

I want to add a new Dialog (Dialog2). I want that Dialog0 and the new Dialog2 can pass values to Dialog1. I only can pass values from one Dialog to another one, i mean one-to-one but no two-to-one. ¿How can i do it?

Dialog0.cpp (only a fragment)

void Dialog0::on_pushButton_clicked()
{
    Dialog1 *v = new Dialog1(this, var);
    close();
    v->show();
}

Dialog0.h

#ifndef DIALOG0_H
#define DIALOG0_H

#include <QDialog>
#include <dialog1.h>
namespace Ui {
class Dialog0;
}

class Dialog0 : public QDialog
{
    Q_OBJECT

public:
    explicit Dialog0(QWidget *parent = 0);
    ~Dialog0();
    int var;
private slots:
    void on_pushButton_clicked();

private:
    Ui::Dialog0 *ui;
};

#endif // DIALOG0_H

Dialog1.cpp

#include "dialog1.h"
#include "ui_dialog1.h"
#include <dialog1.h>
Dialog1::Dialog1(QWidget *parent, int var) :
    QDialog(parent),
    ui(new Ui::Dialog1), var(var)
{
    ui->setupUi(this);
    ...
}
Dialog1::~Dialog1()
{
    delete ui;
}
void Dialog1::on_pushButton_clicked()
{
    ...
}

Dialog1.h

#ifndef DIALOG1_H
#define DIALOG1_H

#include <QDialog>

namespace Ui {
class Dialog1;
}

class Dialog1 : public QDialog
{
    Q_OBJECT

public:

    explicit Dialog1(QWidget *parent = 0);
    Dialog1(QWidget *parent = 0, int var = 0);
    ~Dialog1();
    QString curso;
    int numero;
    int cont;
private slots:
    void on_pushButton_clicked();

private:
    int var;
    Ui::Dialog1 *ui;
};

#endif // DIALOG1_H

joeQ

@Eduardo12l Hi, friend, welcome.

Where is your QDialog2 new ? Can you tell me or show some code for QDialog2 ?

From your code snippet, I only know you new QDialog1 in Dialog0::button_click_function.

Eduardo12l

@joeQ Hi ^^ . This could be my Dialog2 but i dont know how to pass "nu" to Dialog1

#include "dialog2.h"
#include "ui_dialog2.h"

Dialog2::Dialog2(QWidget *parent):
    QDialog(parent),
    ui(new Ui::Dialog2)  
{
    ui->setupUi(this);
}
Dialog2::~Dialog2()
{
    delete ui;
}
void Dialog2::on_pushButton_2_clicked()
{
     ...
     Dialog1 *a = new Dialog1(this, nu);
     close();
     a->show();
}

joeQ

@Eduardo12l

Hi, from your code, you did it.

Dialog1 *a = new Dialog1(this, nu); ///< you pass un to Dialog1

can you show dialog2.h file ?

I want to know where is you new dialog2 object ?

jsulm

@Eduardo12l Just use signals/slots, you can connect as many signal sender to one receiver as you want (it is n:m).

Eduardo12l

@jsulm But how can i pass data from Dialog 0 and Dialog2 to Dialog1. I know how to connect them but not how to pass data.

Eduardo12l

@joeQ It has nothing because i dont know what to do

#ifndef VENTANAS2_H
#define VENTANAS2_H

#include <QDialog>

namespace Ui {
class Ventanas2;
}

class Ventanas2 : public QDialog
{
   Q_OBJECT

public:
   explicit Ventanas2(QWidget *parent = 0);
   ~Ventanas2();

private:
   Ui::Ventanas2 *ui;
};

#endif // VENTANAS2_H

jsulm

@Eduardo12l You connect a signal from Dialog0 to Dialog1 and you connect a signal from Dialog2 to Dialog1, that's all. You pass data as signal parameter:

class SignalSender: public QObject
{
Q_OBJECT

signals:
    void signal1(const QString &someData);
 };

class SignalReceiver: public QObject
{
Q_OBJECT

public slots:
    void doSomething(const QString &someData);
}

SignalSender *sender = new SignalSender();
SignalReceiver *receiver = new SignalReceiver();
connect(sender, SIGNAL(signal1(QString)), receiver, SLOT(doSomething(QString)));
// then somewhere in SignalSender:
QString data = "some data";
emit signal1(data);

Everything is described here: http://doc.qt.io/qt-5.9/signalsandslots.html