Get text from QCombobox.

[dragon]

Hello Anyone,

I have qt-4.7

I have a Mainwindow with QComboBox called diaCombobox.
I have also severall QDialogs.
Now i want to retrieve text from my MainWindow QComboBox (diaCombobox) en paste into my QDialog.
How can i connect to my MainWindow from my QDialog to get the text from my MainWindow QCombobox (diaCombobox).

mainwindow.h

class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QComboBox *diaCombobox;
etc..

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QComboBox *diaCombobox;
etc..

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mainwindow.cc

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    diaCombobox = ui->diaCombobox;
etc....

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

    diaCombobox = ui->diaCombobox;
etc....

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dialog.h
[CODE]
class SlotDialog : public QDialog
{
Q_OBJECT

public:
SlotDialog(QWidget *parent = 0);
//int n;
//QString ae;
//QString vc;
//QString voed;
~SlotDialog();

public slots:
void changed();

private:
Ui::SlotDialog *ui;
MainWindow *parent;
QTableWidget *slotTable;
etc...
[CODE]

dialog.cc

SlotDialog::SlotDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::SlotDialog)
 
{
    ui->setupUi(this);
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}
 
etc..

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

{
    ui->setupUi(this);
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}

etc..

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thanks in advanced.

[KillGabio]

this->ui->comboBox->currentText ();

greetings

[dragon]

Hello,

this->ui->comboBox->currentText ();

This give my a error because in my QDialog i don't have a QCombobox.
Only in my MainWindow.

dialo.cc

SlotDialog::SlotDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::SlotDialog)
 
{
    ui->setupUi(this);
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}
 
this->ui->comboBox->currentText ();  this is pointing to my connect ().

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

{
    ui->setupUi(this);
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}

this->ui->comboBox->currentText ();  this is pointing to my connect ().

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[ChrisW67]

It really depends on exactly what you want to achieve and how the objects are create/related.

Here are some options that rely only on standard C++:

• Put a public getter method in your QMainWindow sub-class and call that from the dialog code
• Put a public setter method in your QDialog sub-class and call that from the main window code at appropriate times.
• Pass the value of the combo box into the dialog at construction

This uses Qt:

• Connect the "void currentIndexChanged ( const QString & text )" signal of the combo box to a receiving slot in the dialog.

[KillGabio]

you dont need to have any connect, you have the dialog and the combo box both created in the main if i got you right. Then when you create you dialog you "pass" this information to the constructor, for example your main will look like this:

mainWin.show ();
    //....staff
    YourDialog dia = new YourDialog (parent, mainWin.getInfoFromCombo());
    dia.exec ();

mainWin.show ();
    //....staff
    YourDialog dia = new YourDialog (parent, mainWin.getInfoFromCombo());
    dia.exec ();

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that way you have the value of the comboBox and treat it as you like..

yep my english sucks but i wanted to say something like what chris answered, lol

[dragon]

Hello,

Thanks for the answer but this not what iám looking for.
i don't want to use the main.cc for this application because i have severall dialogs to do the same thing.

The dialogs will be called through the MainWindow with a button like this.
mainwindow.cc

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    diaCombobox = ui->diaCombobox;
 
    connect(ui->pbFullSlot, SIGNAL(clicked()), this, SLOT(fullslot())); // This  is the pushbutton connection for my dialog.
}
 
void MainWindow::fullslot(){
    SlotDialog dlg(this);
    if(dlg.exec() == QDialog::Accepted){   // The dialog popsup.
}

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

    diaCombobox = ui->diaCombobox;

    connect(ui->pbFullSlot, SIGNAL(clicked()), this, SLOT(fullslot())); // This  is the pushbutton connection for my dialog.
}

void MainWindow::fullslot(){
    SlotDialog dlg(this);
    if(dlg.exec() == QDialog::Accepted){   // The dialog popsup.
}

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Before i click on the pushbutton on the MainWindow i have some text in the Combobox on the MainWindow.
That text i want to use in the dialog in a if statement like this.
dialog.cc

SlotDialog::SlotDialog(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::SlotDialog)
 
{
    ui->setupUi(this);
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}
 
void SlotDialog::changed()
{
        QTableWidgetItem *item = new QTableWidgetItem();
        item = ui->slotTable->currentItem();
        if(item !=0){
        voed = item->text();
        }
 
        if(ui->slotTable->currentColumn()== 1 ){
            QString ap = ..........    // Here i want the text from the combobox from the Mainwindow.
            n = ap.toInt();
            n = n * 1.5;
 
        }
}

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

{
    ui->setupUi(this);
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}

void SlotDialog::changed()
{
        QTableWidgetItem *item = new QTableWidgetItem();
        item = ui->slotTable->currentItem();
        if(item !=0){
        voed = item->text();
        }

        if(ui->slotTable->currentColumn()== 1 ){
            QString ap = ..........    // Here i want the text from the combobox from the Mainwindow.
            n = ap.toInt();
            n = n * 1.5;

        }
}

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Thaks in advanced

[KillGabio]

as we said, if you need the text from the comboBox that is in mainWindow you need to do something like this

//When you call this function you "pass" the combotext to the contructor of the dialog, change the constructor of SlotDialog
void MainWindow::fullslot(){
SlotDialog dlg(this, this->ui->comboBox->currentText ());
if(dlg.exec() == QDialog::Accepted){
}

//When you call this function you "pass" the combotext to the contructor of the dialog, change the constructor of SlotDialog
void MainWindow::fullslot(){
SlotDialog dlg(this, this->ui->comboBox->currentText ());
if(dlg.exec() == QDialog::Accepted){
}

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SlotDialog::SlotDialog(QWidget *parent, QString comboText) :
QDialog(parent),
ui(new Ui::SlotDialog)
 
{
ui->setupUi(this);
this.comboText = comboText;
connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}

SlotDialog::SlotDialog(QWidget *parent, QString comboText) :
QDialog(parent),
ui(new Ui::SlotDialog)
 
{
ui->setupUi(this);
this.comboText = comboText;
connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
}

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you will need to create a variable comboText or whatever name you want to give it in your private of SlotDialog.h

pretty neat? ah?

then you just replace your dots for this

if(ui->slotTable->currentColumn()== 1 ){
QString ap = comboText; // Here i want the text from the combobox from the Mainwindow.
n = ap.toInt();
n = n * 1.5;
 
}

if(ui->slotTable->currentColumn()== 1 ){
QString ap = comboText; // Here i want the text from the combobox from the Mainwindow.
n = ap.toInt();
n = n * 1.5;
 
}

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hope it helps

[dragon]

Hello KillGabio,

Thanks so far your explanation.
I have only one error like this.

In member function void MainWindow::fullslot()
no matching function for call to SlotDialog::SlotDialog(MainWindow* const, QString)
mainwindow.cc

SlotDialog dlg(this, this->ui->diaCombobox->currentText());

SlotDialog dlg(this, this->ui->diaCombobox->currentText());

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Thanks in advance.

[KillGabio]

thats because you haven`t change your funtion in SlotDialog.h, the error is telling you this

you have to look for the constructor and add something like this

explicit SlotDialog(QWidget *parent = 0, QString = "no data"); //this is just an example

this is a basic mistake u just need to try/error a little bit more

[dragon]

Hello KillGabio,

I have still a error like this.
In constructor SlotDialog::SlotDialog(Qwidget*, QString)
request for member comboText in this of non-class type SlotDialog* const

I have change in dialog.h the constructor like this.

public:
    explicit SlotDialog(QWidget *parent = 0, QString ="");

public:
    explicit SlotDialog(QWidget *parent = 0, QString ="");

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Thanks in advance.

[KillGabio]

post all your code

[dragon]

Hello KillGabio,

Here all my code.

manwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H
 
#include <QtGui>
#include <QtGui/QMainWindow>
 
 
namespace Ui {
    class MainWindow;
}
 
class MainWindow : public QMainWindow
{
    Q_OBJECT
 
public:
    MainWindow(QWidget *parent = 0);
    ~MainWindow();
 
public slots:
    void fullslot();
private:
    Ui::MainWindow *ui;
    QTableWidgetItem *item;    
};
 
#endif // MAINWINDOW_H

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QtGui>
#include <QtGui/QMainWindow>


namespace Ui {
    class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

public slots:
    void fullslot();
private:
    Ui::MainWindow *ui;
    QTableWidgetItem *item;    
};

#endif // MAINWINDOW_H

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mainwindow.cc

#include <QtGui>
#include <QtCore>
#include "mainwindow.h"
#include "slotdialog.h"
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowIcon(QIcon(":/images/images/UOP_1.PNG"));
    connect(ui->pbFullSlot, SIGNAL(clicked()), this, SLOT(fullslot()));
 
    Qt::WindowFlags flags;
    flags = Qt::Window | Qt::WindowMinimizeButtonHint;
    setWindowFlags( flags );
 
    this->setStatusBar(false);
 
    statusBar()->hide();
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::fullslot(){
    SlotDialog dlg(this, this->ui->diaCombobox->currentText());
    if(dlg.exec() == QDialog::Accepted){
    }
 
}

#include <QtGui>
#include <QtCore>
#include "mainwindow.h"
#include "slotdialog.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    setWindowIcon(QIcon(":/images/images/UOP_1.PNG"));
    connect(ui->pbFullSlot, SIGNAL(clicked()), this, SLOT(fullslot()));

    Qt::WindowFlags flags;
    flags = Qt::Window | Qt::WindowMinimizeButtonHint;
    setWindowFlags( flags );

    this->setStatusBar(false);

    statusBar()->hide();

}

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

void MainWindow::fullslot(){
    SlotDialog dlg(this, this->ui->diaCombobox->currentText());
    if(dlg.exec() == QDialog::Accepted){
    }

}

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dialog.h

#ifndef SLOTDIALOG_H
#define SLOTDIALOG_H
 
#include <QDialog>
#include <QtGui>
#include "mainwindow.h"
 
namespace Ui {
    class SlotDialog;
}
 
class SlotDialog : public QDialog
{
    Q_OBJECT
 
public:
    explicit SlotDialog(QWidget *parent = 0, QString ="");
    ~SlotDialog();
    QString dia, voed;
 
public slots:
    void changed();
 
private:
    Ui::SlotDialog *ui;
    QString comboText;
    QTableWidget *slotTable;
};
#endif // SLOTDIALOG_H

#ifndef SLOTDIALOG_H
#define SLOTDIALOG_H

#include <QDialog>
#include <QtGui>
#include "mainwindow.h"

namespace Ui {
    class SlotDialog;
}

class SlotDialog : public QDialog
{
    Q_OBJECT

public:
    explicit SlotDialog(QWidget *parent = 0, QString ="");
    ~SlotDialog();
    QString dia, voed;

public slots:
    void changed();

private:
    Ui::SlotDialog *ui;
    QString comboText;
    QTableWidget *slotTable;
};
#endif // SLOTDIALOG_H

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dialog.cc

#include "slotdialog.h"
#include "ui_slotdialog.h"
 
 
    SlotDialog::SlotDialog(QWidget *parent, QString comboText) :
    QDialog(parent),
    ui(new Ui::SlotDialog)
 
{
    ui->setupUi(this);
    this.comboText = comboText;
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));
 
 
}
 
void SlotDialog::changed()
{
        QTableWidgetItem *item = new QTableWidgetItem();
        item = ui->slotTable->currentItem();
        if(item !=0){
        voed = item->text();
        }
        if(ui->slotTable->currentColumn()== 1 ){
           QString dia = combotext;
          etc.......        
        }
}

#include "slotdialog.h"
#include "ui_slotdialog.h"


    SlotDialog::SlotDialog(QWidget *parent, QString comboText) :
    QDialog(parent),
    ui(new Ui::SlotDialog)

{
    ui->setupUi(this);
    this.comboText = comboText;
    connect(ui->slotTable, SIGNAL(cellClicked(int,int)), this, SLOT(changed()));


}

void SlotDialog::changed()
{
        QTableWidgetItem *item = new QTableWidgetItem();
        item = ui->slotTable->currentItem();
        if(item !=0){
        voed = item->text();
        }
        if(ui->slotTable->currentColumn()== 1 ){
           QString dia = combotext;
          etc.......        
        }
}

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main.cc

#include <QtGui/QApplication>
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

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[KillGabio]

mmm change this

explicit SlotDialog(QWidget *parent = 0, QString ="");

to this

explicit SlotDialog(QWidget *parent = 0, QString comboText=" ");

explicit SlotDialog(QWidget *parent = 0, QString comboText=" ");

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oh and change this

this.comboText = comboText

for

this->comboText= comboText

this->comboText= comboText

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[dragon]

Hello KillGabio,

Thanks of lot this is what i'am looking for.
It works perfect.
Thanks for your time and advices.