exportdialog.h Example File

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  #ifndef EXPORTDIALOG_H
  #define EXPORTDIALOG_H

  #include <QDialog>

  QT_FORWARD_DECLARE_CLASS(QLineEdit)
  QT_FORWARD_DECLARE_CLASS(QSpinBox)

  class ExportDialog : public QDialog
  {
      Q_OBJECT
  public:
      explicit ExportDialog(QWidget *parent = 0);

      QSize exportSize() const;
      void setExportSize(const QSize &);

      QString exportFileName() const;
      void setExportFileName(const QString &);

      void accept() override;

  private slots:
      void browse();
      void resetExportSize();
      void exportWidthChanged(int width);
      void exportHeightChanged(int height);

  private:
      void setExportWidthBlocked(int width);
      void setExportHeightBlocked(int height);

      QLineEdit *m_fileNameLineEdit;
      QSpinBox *m_widthSpinBox;
      QSpinBox *m_heightSpinBox;
      QSize m_defaultSize;
      qreal m_aspectRatio;
  };

  #endif // EXPORTDIALOG_H