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 ?

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.

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

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.

Solved access to another ui widget from mainwindow