Add a new desktop application: lumina-pdf

This is a basic PDF file viewer application, with printing capabilities.
NOTE: This is not quite done yet - the basic PDF viewer works if an input file is supplied, but I have not finished adding all the normal window operations around it yet (menu bar with close, open file options, progress bar for loading status rather than using a message box, etc...)

1 files changed, 102 insertions, 0 deletions

diff --git a/src-qt5/desktop-utils/lumina-pdf/mainUI.cpp b/src-qt5/desktop-utils/lumina-pdf/mainUI.cpp
new file mode 100644
index 00000000..22e41dbb
--- /dev/null
+++ b/src-qt5/desktop-utils/lumina-pdf/mainUI.cpp
@@ -0,0 +1,102 @@
+//===========================================
+//  Lumina Desktop source code
+//  Copyright (c) 2017, Ken Moore
+//  Available under the 3-clause BSD license
+//  See the LICENSE file for full details
+//===========================================
+#include "mainUI.h"
+#include <QPainter>
+#include <QImage>
+#include <QSize>
+#include <QMessageBox>
+#include <QDebug>
+#include <QApplication>
+
+#include <LuminaXDG.h>
+
+MainUI::MainUI() : QPrintPreviewDialog(0, Qt::Window){
+
+  //this->addStatusBar();
+  
+  connect(this, SIGNAL(paintRequested(QPrinter*)), this, SLOT(paintOnWidget(QPrinter*)) );
+  DOC = 0;
+}
+
+MainUI::~MainUI(){
+
+}
+
+void MainUI::loadFile(QString path){
+  if(DOC!=0){
+    //Clear out the old document first
+    delete DOC;
+  }
+  if(!QFile::exists(path) || path.isEmpty() ){QApplication::exit(1); }
+  DOC = Poppler::Document::load(path);
+  if(DOC!=0){ this->setWindowTitle(DOC->title()); }
+  if(this->windowTitle().isEmpty()){ this->setWindowTitle(path.section("/",-1)); }
+  this->setWindowIcon( LXDG::findIcon("application-pdf","unknown"));
+  //Setup the Document
+  Poppler::Page *PAGE = DOC->page(0);
+  if(PAGE!=0){
+    this->printer()->setPageSize( QPageSize(PAGE->pageSize(), QPageSize::Point) ); 
+    switch(PAGE->orientation()){
+	case Poppler::Page::Landscape:
+	  this->printer()->setOrientation(QPrinter::Landscape); break;
+	default:
+	  this->printer()->setOrientation(QPrinter::Portrait);
+    }
+    delete PAGE;
+  }
+
+}
+
+void MainUI::done(int val){
+  //This is automatically called with value=1 when the "print()" function finishes
+  //Otherwise close down the application
+  if(val==0){ QApplication::exit(0); }
+}
+
+void MainUI::paintOnWidget(QPrinter *PRINTER){
+  if(DOC==0){ return; }
+  int pages = DOC->numPages();
+  int firstpage = 0;
+  //qDebug() << "Start Rendering PDF:" << PRINTER->fromPage() << PRINTER->toPage();
+  if(PRINTER->fromPage() != PRINTER->toPage() || PRINTER->fromPage()!=0){
+    firstpage = PRINTER->fromPage() - 1;
+    pages = PRINTER->toPage();
+  }
+  qDebug() << " - Generating Pages:" << firstpage << pages;
+  //Now start painting all the pages onto the widget
+  QRectF size = PRINTER->pageRect(QPrinter::DevicePixel);
+  QSize DPI(PRINTER->resolution(),PRINTER->resolution());
+  QPainter painter(PRINTER);
+  Poppler::Page *PAGE = 0;
+  QMessageBox wait(QMessageBox::NoIcon, tr("Opening PDF..."), QString(tr("Preparing Document (%1 pages)")).arg(QString::number(pages)), QMessageBox::Abort, this);
+    wait.setInformativeText(" "); //Make sure the window is the right size before showing it
+    wait.setStandardButtons(QMessageBox::Abort); //make sure that no buttons are used
+    wait.show();
+    for(int i=firstpage; i<pages && wait.isVisible(); i++){
+      wait.setInformativeText( QString(tr("Loading Page: %1")).arg(i+1) );
+      //qDebug() << "Loading Page:" << i;
+      QApplication::processEvents();
+      //Now paint this page on the printer
+      if(PAGE!=0){ delete PAGE; PRINTER->newPage(); } //this is the start of the next page (not needed for first)
+      PAGE = DOC->page(i);
+      if(PAGE!=0){
+        painter.drawImage(0,0,PAGE->renderToImage(DPI.width(), DPI.height()).scaled(size.width(), size.height(), Qt::KeepAspectRatio, Qt::SmoothTransformation) );
+      }else{
+        painter.drawImage(0,0,QImage()); 
+      }
+      QApplication::processEvents();
+    }
+  if(PAGE!=0){ delete PAGE; }
+  wait.close();
+}
+
+void MainUI::OpenNewFile(){
+  //Prompt for a file
+
+  //Now Open it
+  
+}