added animation to NotebookPageDropPreview

notebookpagedroppreview.h

@@ -1,6 +1,7 @@
 #ifndef NOTEBOOKPAGEDROPPREVIEW_H
 #define NOTEBOOKPAGEDROPPREVIEW_H
 
+#include <QPropertyAnimation>
 #include <QWidget>
 
 class NotebookPageDropPreview : public QWidget
@@ -8,8 +9,13 @@ class NotebookPageDropPreview : public QWidget
 public:
     NotebookPageDropPreview(QWidget *parent);
 
+    void setBounds(const QRect &rect);
+
 protected:
     void paintEvent(QPaintEvent *);
+
+    QPropertyAnimation m_positionAnimation;
+    QRect m_desiredGeometry;
 };
 
 #endif  // NOTEBOOKPAGEDROPPREVIEW_H