Drop file opens it, command line arguments

PdfForQtViewer/main.cpp

@@ -43,5 +43,11 @@ int main(int argc, char *argv[])
     pdfviewer::PDFViewerMainWindow mainWindow;
     mainWindow.show();
 
+    QStringList arguments = application.arguments();
+    if (arguments.size() > 1)
+    {
+        mainWindow.openDocument(arguments[1]);
+    }
+
     return application.exec();
 }

PdfForQtViewer/pdfviewermainwindow.cpp

@@ -102,6 +102,8 @@ PDFViewerMainWindow::PDFViewerMainWindow(QWidget* parent) :
 {
     ui->setupUi(this);
 
+    setAcceptDrops(true);
+
     // Initialize toolbar icon size
     QSize iconSize = pdf::PDFWidgetUtils::scaleDPI(this, QSize(24, 24));
     ui->mainToolBar->setIconSize(iconSize);
@@ -1503,4 +1505,42 @@ void PDFViewerMainWindow::saveDocument(const QString& fileName)
     }
 }
 
+
+void PDFViewerMainWindow::dragEnterEvent(QDragEnterEvent* event)
+{
+    if (event->mimeData()->hasUrls())
+    {
+        event->setDropAction(Qt::LinkAction);
+        event->accept();
+    }
+}
+
+void PDFViewerMainWindow::dragMoveEvent(QDragMoveEvent* event)
+{
+    if (event->mimeData()->hasUrls())
+    {
+        event->setDropAction(Qt::LinkAction);
+        event->accept();
+    }
+}
+
+void PDFViewerMainWindow::dragLeaveEvent(QDragLeaveEvent* event)
+{
+
+}
+
+void PDFViewerMainWindow::dropEvent(QDropEvent* event)
+{
+    if (event->mimeData()->hasUrls())
+    {
+        QList<QUrl> urls = event->mimeData()->urls();
+        if (urls.size() == 1)
+        {
+            openDocument(urls.front().toLocalFile());
+            event->acceptProposedAction();
+        }
+    }
+}
+
+
 }   // namespace pdfviewer

PdfForQtViewer/pdfviewermainwindow.h

@@ -74,9 +74,17 @@ public:
     virtual void closeEvent(QCloseEvent* event) override;
     virtual void showEvent(QShowEvent* event) override;
 
+    void openDocument(const QString& fileName);
+
 signals:
     void queryPasswordRequest(QString* password, bool* ok);
 
+protected:
+    virtual void dragEnterEvent(QDragEnterEvent* event) override;
+    virtual void dragMoveEvent(QDragMoveEvent* event) override;
+    virtual void dragLeaveEvent(QDragLeaveEvent* event) override;
+    virtual void dropEvent(QDropEvent* event) override;
+
 private slots:
     void onQueryPasswordRequest(QString* password, bool* ok);
 
@@ -137,7 +145,6 @@ private:
     void onViewerSettingsChanged();
     void onRenderingOptionTriggered(bool checked);
 
-    void openDocument(const QString& fileName);
     void setDocument(pdf::PDFModifiedDocument document);
     void closeDocument();
     void saveDocument(const QString& fileName);

README.txt

@@ -1,7 +1,7 @@
 
 ==========================================================================
                     PDFforQt library / PDF viewer
-                     (c) Jakub Melka 2018-2019
+                     (c) Jakub Melka 2018-2020
 ==========================================================================
 
 This software is consisting of PDF rendering library, and viewer,