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Application Development with Qt Creator - Second Edition by Ray Rischpater

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Instantiating forms, message boxes, and dialogs in your application

Qt Designer generates an XML-based layout file (which ends in .ui) for each form you create in Designer. At compile time, Qt Creator compiles the layout into a header file that constructs the components for your user interface layout. The pattern typically used by Qt applications is to construct a private layout class that the main class instantiates. Here's how it works for the main window:

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

namespace Ui {
  class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT
    
public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    
private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

In mainwindow.cpp, we ...

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