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diff --git a/src-qt5/desktop-utils/lumina-pdf/mainUI.h b/src-qt5/desktop-utils/lumina-pdf/mainUI.h
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+++ b/src-qt5/desktop-utils/lumina-pdf/mainUI.h
@@ -0,0 +1,108 @@
+//===========================================
+//  Lumina Desktop source code
+//  Copyright (c) 2017, Ken Moore
+//  Available under the 3-clause BSD license
+//  See the LICENSE file for full details
+//===========================================
+#ifndef _LUMINA_PDF_VIEWER_MAIN_WINDOW_H
+#define _LUMINA_PDF_VIEWER_MAIN_WINDOW_H
+
+#include <QPrintPreviewWidget>
+#include <QPrintDialog>
+#include <QPrinter>
+#include <QMainWindow>
+#include <QProgressBar>
+#include <QLabel>
+#include <QKeyEvent>
+#include <QDebug>
+
+#include <poppler-qt5.h>
+
+namespace Ui{
+	class MainUI;
+};
+
+class MainUI : public QMainWindow{
+	Q_OBJECT
+public:
+	MainUI();
+	~MainUI();
+
+	void loadFile(QString path);
+
+
+private:
+	Poppler::Document *DOC;
+	QPrintPreviewWidget *WIDGET;
+	Ui::MainUI *ui;
+	QPrinter* Printer;
+	QPrintDialog *PrintDLG;
+
+	QString lastdir;
+
+	//Other Interface elements
+	QProgressBar *progress;
+	QAction *progAct; //action associated with the progressbar
+
+	//PDF Page Loading cache variables
+	QHash<int, QImage> loadingHash;
+	int numPages;
+
+	void loadPage(int num, Poppler::Document *doc, MainUI *obj, QSize dpi, QSizeF page);
+
+	//Functions/variables for the presentation mode
+	QLabel *presentationLabel;
+	QScreen *getScreen(bool current, bool &cancelled);
+	int CurrentPage;
+	void startPresentation(bool atStart);
+	void ShowPage(int page);
+	void endPresentation();
+
+private slots:
+	void startLoadingPages(QPrinter *printer);
+	void slotPageLoaded(int);
+	void slotStartPresentation(QAction *act);
+
+	void paintOnWidget(QPrinter *PRINTER);
+	void paintToPrinter(QPrinter *PRINTER);
+
+	//Button Slots
+	void OpenNewFile();
+
+signals:
+	void PageLoaded(int);
+
+protected:
+	void keyPressEvent(QKeyEvent *event){
+	  //See if this is one of the special hotkeys and act appropriately
+	  // NOTE: Some of this is duplicated with the QShortcut definitions (for non-presentation mode)
+	  //  This routine does not always work for the main window viewer due to differing widget focus policies
+	  if(presentationLabel!=0 && presentationLabel->isVisible()){
+	    //qDebug() << "Got Key Press:";
+	    if( event->key()==Qt::Key_Escape || event->key()==Qt::Key_Backspace){
+	      //qDebug() << " - Escape/Backspace";
+	      endPresentation();
+	    }else if(event->key()==Qt::Key_Right || event->key()==Qt::Key_Down || event->key()==Qt::Key_Space){
+	      //qDebug() << " - Right/Down/Spacebar";
+	      ShowPage( CurrentPage+1 );
+	    }else if(event->key()==Qt::Key_Left || event->key()==Qt::Key_Up){
+	      //qDebug() << " - Left/Up";
+	      ShowPage( CurrentPage-1 );
+	    }else if(event->key()==Qt::Key_Home){
+	      //qDebug() << " - Home";
+	      ShowPage(0); //go to the first page
+	    }else if(event->key()==Qt::Key_End){
+	      //qDebug() << " - End";
+	      ShowPage( numPages-1 ); //go to the last page
+	    }else if(event->key()==Qt::Key_F11){
+	      //qDebug() << " - F11";
+	      endPresentation();
+            }else{
+	      QMainWindow::keyPressEvent(event);
+	    }
+	  }else{
+	    QMainWindow::keyPressEvent(event);
+	  }
+	}
+};
+#endif