dialog.h Example File

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  #ifndef DIALOG_H
  #define DIALOG_H

  #include <QDialog>

  namespace Ui {
  class Dialog;
  }

  class Dialog : public QDialog
  {
      Q_OBJECT

  public:
      explicit Dialog(QWidget *parent = nullptr);

      void displayMessage(const QString &message);

  signals:
      void sendText(const QString &text);

  private slots:
      void clicked();

  private:
      Ui::Dialog *ui;
  };

  #endif // DIALOG_H