PDF Viewer Example

 // Copyright (C) 2016 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QLoggingCategory>
 #include <QMainWindow>

 Q_DECLARE_LOGGING_CATEGORY(lcExample)

 namespace Ui {
 class MainWindow;
 }

 class QPdfDocument;
 class QPdfView;
 class QSpinBox;

 class ZoomSelector;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     explicit MainWindow(QWidget *parent = nullptr);
     ~MainWindow();

 public slots:
     void open(const QUrl &docLocation);

 private slots:
     void bookmarkSelected(const QModelIndex &index);
     void pageSelected(int page);

     // action handlers
     void on_actionOpen_triggered();
     void on_actionQuit_triggered();
     void on_actionAbout_triggered();
     void on_actionAbout_Qt_triggered();
     void on_actionZoom_In_triggered();
     void on_actionZoom_Out_triggered();
     void on_actionPrevious_Page_triggered();
     void on_actionNext_Page_triggered();
     void on_actionContinuous_triggered();
     void on_actionBack_triggered();
     void on_actionForward_triggered();

 private:
     Ui::MainWindow *ui;
     ZoomSelector *m_zoomSelector;
     QSpinBox *m_pageSelector;

     QPdfDocument *m_document;
 };

 #endif // MAINWINDOW_H