From b68e15a811359f8c7ab6f239cd5e8bf36e854f0e Mon Sep 17 00:00:00 2001
From: Ian Jauslin <ian.jauslin@roma1.infn.it>
Date: Sun, 7 Jun 2015 15:28:16 +0000
Subject: Initial commit

---
 src/pdfWindow.cpp | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 src/pdfWindow.cpp

(limited to 'src/pdfWindow.cpp')

diff --git a/src/pdfWindow.cpp b/src/pdfWindow.cpp
new file mode 100644
index 0000000..e4ca3e4
--- /dev/null
+++ b/src/pdfWindow.cpp
@@ -0,0 +1,139 @@
+/*
+Copyright 2015 Ian Jauslin
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "pdfWindow.h"
+
+// constructor
+pdfWindow::pdfWindow(QWidget *parent) :
+  QMainWindow(parent)
+{
+  // set defaults
+  fullscreen=0;
+  curpage=0;
+  totalpages=0;
+  verticalOffset=0;
+  document=NULL;
+
+  //scene to draw the view
+  pdfViewScene=new QGraphicsScene;
+  pdfView=new QGraphicsView(pdfViewScene);
+}
+
+// set PDF document
+void pdfWindow::setDoc(char* file){
+  if(document){delete document;}
+  doc=file;
+
+  QString filename=file;
+  document = Poppler::Document::load(filename);
+  if(document){
+    // display options
+    document->setRenderHint(Poppler::Document::Antialiasing,true);
+    document->setRenderHint(Poppler::Document::TextAntialiasing,true);
+
+    curpage=0;
+    totalpages=document->numPages();
+    this->updatePDF();
+  }
+}
+
+void pdfWindow::gotoPage(int page){
+  if(page<totalpages && page>=0){
+    curpage=page;
+    this->updatePDF();
+  }
+}
+void pdfWindow::nextPage(){
+  if(curpage<totalpages-1){
+    curpage++;
+    this->updatePDF();
+  }
+}
+void pdfWindow::previousPage(){
+  if(curpage>0){
+    curpage--;
+    this->updatePDF();
+  }
+}
+
+// toggle fullscreen
+void pdfWindow::fullscreenPDF(){
+  if(!fullscreen){
+    fullscreen=1;
+    this->showFullScreen();
+  }
+  else{
+    fullscreen=0;
+    this->showNormal();
+  }
+}
+
+// draw (or redraw) PDF
+void pdfWindow::updatePDF(){
+  // current page
+  Poppler::Page* pdfPage = document->page(curpage);
+  if(!pdfPage){
+    std::cout << "Error: could not load page " << curpage << '\n';
+    return;
+  }
+
+  // total size available
+  QSize windowsize=this->size();
+  // verticalOffset to allow timebar
+  QSize viewSize(windowsize.width()+2,windowsize.height()+2-verticalOffset);
+  pdfView->setGeometry(-1,-1,viewSize.width(),viewSize.height());
+  
+  // page size in points (1/72 inch)
+  QSize pageSize=pdfPage->pageSize();
+  // aspect ratio
+  double aspect=double(pageSize.width())/double(pageSize.height());
+  // an image to display the page
+  QImage image;
+  // keep aspect ratop
+  if(viewSize.width()<=aspect*viewSize.height()){
+    // render PDF page with appropriate resolution (pix/inch)
+    image = pdfPage->renderToImage(72*viewSize.width()/pageSize.width(),72*viewSize.width()/aspect/pageSize.height(),0,0,viewSize.width(),viewSize.width()/aspect);
+  }
+  else{
+    // render PDF page with appropriate resolution (pix/inch)
+    image = pdfPage->renderToImage(72*viewSize.height()*aspect/pageSize.width(),72*viewSize.height()/pageSize.height(),0,0,viewSize.height()*aspect,viewSize.height());
+  }
+  delete pdfPage;
+
+  // update scene
+  delete pdfViewScene;
+  pdfViewScene=new QGraphicsScene;
+  pdfView->setScene(pdfViewScene);
+  pdfViewScene->setBackgroundBrush(Qt::black);
+  // draw image
+  pdfViewScene->addPixmap(QPixmap::fromImage(image));
+}
+
+// respond to resize
+void pdfWindow::resizeEvent(QResizeEvent* event){
+  if(document){
+    this->updatePDF();
+  }
+  
+  QMainWindow::resizeEvent(event);
+}
+
+// destructor
+pdfWindow::~pdfWindow(){
+  if(document){delete document;}
+  delete pdfView;
+  delete pdfViewScene;
+}
-- 
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