access to another ui widget from mainwindow

[rapid84]

Hi,
I have a ui project that has mainwindow and another ui file. The another ui file has a combobox and i want to access it from mainwindow and i want to use its selected item in mainwindow. How can i do ?

[A Former User]

Hi! The ui object should be private to its owning form. To make form data visible to other objects (e.g. your mainwindow) you can add...

• ordinary getter and setter functions
• Qt signals and slots
• Qt properties

... to your second form.

[A Former User]

For example this could be your second form:

In form.h:

class Form : public QWidget
{
    Q_OBJECT

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

    QString currentText() const;

private:
    Ui::Form *ui;
};

In form.cpp:

QString Form::currentText() const
{
    return ui->comboBox->currentText();
}

You can now access QString Form::currentText() const from your main window to get the combobox data.

[rapid84]

@Wieland
Thanks for reply but when i try to use it gives error:

error: 'currentText' was not declared in this scope

[A Former User]

Here is a complete example for a mainwindow and a second form. The form has a combobox. The mainwindow has a pushbutton. Everytime the pushbutton is clicked the pushbutton's text is set to the current text of the combobox.

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

class Form;

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

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

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
    Form *m_form;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include "form.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    m_form = new Form;
    m_form->show();
}

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

void MainWindow::on_pushButton_clicked()
{
    ui->pushButton->setText( m_form->currentText() );
}

form.h

#ifndef FORM_H
#define FORM_H

#include <QWidget>
#include <QString>

namespace Ui {
class Form;
}

class Form : public QWidget
{
    Q_OBJECT

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

    QString currentText() const;

private:
    Ui::Form *ui;
};

#endif // FORM_H

form.cpp

#include "form.h"
#include "ui_form.h"

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

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


QString Form::currentText() const
{
    return ui->comboBox->currentText();
}

[rapid84]

@Wieland

Thanks, it works now.