support commandline arguments (passing file list only)

graphicsview.h

@@ -2,6 +2,7 @@
 #define GRAPHICSVIEW_H
 
 #include <QGraphicsView>
+#include <QUrl>
 
 class GraphicsScene;
 class GraphicsView : public QGraphicsView
@@ -9,6 +10,8 @@ class GraphicsView : public QGraphicsView
 public:
     GraphicsView(QWidget *parent = nullptr);
 
+    void showFromUrlList(const QList<QUrl> &urlList);
+
     void showImage(const QPixmap &pixmap);
     void showText(const QString &text);
     void showSvg(const QString &filepath);