How to access contents of ui from a external function? - c++

Question

.h
class MainWindow: public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
Ui::MainWindowClass ui;
private slots:
void on_pushButton_clicked();
};
.cpp
void Test()
{
MainWindow mw;
mw.ui.pushButton->move(QPoint(200, 200));
qDebug() << "test" << "\n";
}
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
QShortcut *shortcut = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q), this);
QObject::connect(shortcut, &QShortcut::activated, this, &Test);
return;
}
How to access the contents of ui from the class MainWindow in the function Test without making Test a child/inherit MainWindow?
I think the way i did is not working as when the function is called with the shortcut the button isnt moved.

Answer 1

Qt compiles ui files into ui_<ui_name>.h (you can see them in your build folder).
So you can use ui just include ui_<ui_name>.h
Example
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
Ui::MainWindow *ui;
private:
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
main.cpp
#include "mainwindow.h"
#include <QApplication>
#include "ui_mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
w.ui->progressBar->setValue(30);
return a.exec();
}