[Fix] Fixed preview window.

src/pdf_factory.cpp

@@ -50,6 +50,8 @@ void PDFFactory::createWidgets(void) {
 
   connect(pdfTableView, SIGNAL(pageClicked(QMouseEvent*,QImage)), pdfPreview,
           SLOT(pageClicked(QMouseEvent*,QImage)));
+  connect(pdfTableView, SIGNAL(previewUpdate(Poppler::Page*)), pdfPreview,
+          SLOT(previewUpdate(Poppler::Page*)));
 
   setWindowIcon(QIcon(":/img/hpdf.png"));
   setWindowTitle(tr("HPDF"));

src/pdf_file_widget.cpp

@@ -131,16 +131,22 @@ void PDFFileWidget::pageClickedHandler(QMouseEvent*, QImage) {
 
 void PDFFileWidget::setDocument(Poppler::Document* document, QString fileName) {
   document->setRenderHint(Poppler::Document::TextAntialiasing);
+  Poppler::Document* doc = Poppler::Document::load(fileName);
+  doc->setRenderHint(Poppler::Document::TextAntialiasing);
+
   int numPages = document->numPages();
   for(int i = 0; i < numPages; i++) {
     Poppler::Page* pdfPage = document->page(i);
 
     PDFPageWidget* pageWidget = new PDFPageWidget();
   
+    pageWidget->setPopplerPage(doc->page(i));
     tgen.render(pageWidget, pdfPage);
 
     connect(pageWidget, SIGNAL(pageClicked(QMouseEvent*,QImage)), this,
             SIGNAL(pageClicked(QMouseEvent*,QImage)));
+    connect(pageWidget, SIGNAL(previewUpdate(Poppler::Page*)), this,
+            SIGNAL(previewUpdate(Poppler::Page*)));
 
     pagesContainerWidget->addPageWidget(pageWidget);
     /* Process event. */

src/pdf_file_widget.h

@@ -75,5 +75,6 @@ private:
 signals:
   void pageClicked(QMouseEvent*, QImage);
   void pageClicked(QMouseEvent*, Poppler::Page*);
+  void previewUpdate(Poppler::Page*);
 };
 

src/pdf_page_widget.cpp

@@ -44,6 +44,10 @@ void PDFPageWidget::setButton(QPushButton* btn) {
   update();
 }
 
+void PDFPageWidget::setPopplerPage(Poppler::Page* pp) {
+  pPage = pp;
+}
+
 void PDFPageWidget::setThumbnail(QImage pageImage) {
   image = pageImage;
   pixmap = QPixmap::fromImage(image);
@@ -53,7 +57,10 @@ void PDFPageWidget::setThumbnail(QImage pageImage) {
 }
 
 void PDFPageWidget::mousePressEvent(QMouseEvent* event) {
+  if(pPage != NULL) {
     emit pageClicked(event, image);
+    emit previewUpdate(pPage);
+  }
 }
 
 void PDFPageWidget::leaveEvent(QEvent* event) {

src/pdf_page_widget.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <QFrame>
+#include <poppler-qt5.h>
 
 class QWidget;
 class QPushButton;
@@ -15,6 +16,8 @@ class PDFPageWidget : public QFrame {
 public:
   PDFPageWidget(QWidget* parent = 0);
   void setThumbnail(QImage pageImage);
+  void setPopplerPage(Poppler::Page*);
+
   void setButton(QPushButton* btn);
   QSize sizeHint() const;
   /*void setButtonImage(QImage* pageImage);*/
@@ -29,10 +32,12 @@ private:
   /*QVector<QPushButton> buttons;*/
   QPushButton*    button;
   QImage          image;
+  Poppler::Page*  pPage;
   QPixmap         pixmap;
   QPushButton*    btn1, *btn2;
 
 signals:
   void pageClicked(QMouseEvent* event, QImage pageImage);
+  void previewUpdate(Poppler::Page*);
 };
 

src/pdf_preview_widget.cpp

@@ -1,8 +1,9 @@
 #include <QtWidgets>
 #include "pdf_preview_widget.h"
 
+int test;
 PDFPreviewWidget::PDFPreviewWidget(QWidget* parent) : QWidget(parent) {
-  
+  pPage = NULL;
 }
 
 void PDFPreviewWidget::setImage(QImage image) {
@@ -10,17 +11,43 @@ void PDFPreviewWidget::setImage(QImage image) {
   update();
 }
 
+void PDFPreviewWidget::regenImage(void) {
+  if(pPage != NULL) {
+    double dpi;
+    double dpi2;
+    QSize targetSize  = this->size();
+    QSizeF oriSize    = pPage->pageSizeF();
+    double oriDpi     = 72;
+    dpi   = targetSize.height() / (float)oriSize.height()*72;
+    dpi2  = targetSize.width()  / (float)oriSize.width()*72;
+    dpi   = dpi<dpi2?dpi:dpi2;
+    previewImage = pPage->renderToImage(dpi, dpi);
+  }
+}
+
+void PDFPreviewWidget::previewUpdate(Poppler::Page* pp) {
+  pPage = pp;
+  regenImage();
+  update();
+}
+
 void PDFPreviewWidget::pageClicked(QMouseEvent* mouseEvent, QImage image) {
-  setImage(image);
+  /*setImage(image);*/
+}
+
+void PDFPreviewWidget::resizeEvent(QResizeEvent* event) {
+  regenImage();
 }
 
 void PDFPreviewWidget::paintEvent(QPaintEvent* event) {
-  QPainter painter(this);
+  if(pPage != NULL) {
 
+    QPainter painter(this);
     QPixmap pixmap = QPixmap::fromImage(previewImage);
     pixmap = pixmap.scaled(size(), Qt::KeepAspectRatio);
     painter.drawPixmap(QRect((size().width() - pixmap.width()) / 2,
                       (size().height() - pixmap.height()) / 2,
                       pixmap.width(), pixmap.height()), pixmap);
   }
+}
 

src/pdf_preview_widget.h

@@ -1,5 +1,6 @@
 #pragma once
 #include <QWidget>
+#include <poppler-qt5.h>
 
 class QImage;
 class QPaintEvent;
@@ -9,15 +10,23 @@ class PDFPreviewWidget : public QWidget {
   Q_OBJECT
 public:
   explicit PDFPreviewWidget(QWidget* parent = 0);
-  void setImage(QImage image);
 
 public slots:
+  void setImage(QImage image);
+  void regenImage(void);
   void pageClicked(QMouseEvent* mouseEvent, QImage image);
+  void previewUpdate(Poppler::Page*);
 
 protected:
   void paintEvent(QPaintEvent* event);
 
 private:
   QImage previewImage;
+  void resizeEvent(QResizeEvent* event);
+  /*PreviewGen tgen;*/
+  Poppler::Page* pPage;
+ 
+signals:
+  void updatePreview(QImage);
 };
 

src/pdf_table_widget.cpp

@@ -41,6 +41,8 @@ void PDFTableWidget::loadFile(QString fileName) {
   fileWidget->setDocument(doc, fileName);
   connect(fileWidget, SIGNAL(pageClicked(QMouseEvent*,QImage)), this,
           SIGNAL(pageClicked(QMouseEvent*,QImage)));
+  connect(fileWidget, SIGNAL(previewUpdate(Poppler::Page*)), this,
+          SIGNAL(previewUpdate(Poppler::Page*)));
 
   fileWidgets.append(fileWidget);
 

src/pdf_table_widget.h

@@ -30,5 +30,6 @@ private:
 
 signals:
   void pageClicked(QMouseEvent*, QImage);
+  void previewUpdate(Poppler::Page*);
 };