航线可以拖入

opmap/mapwidget/opmapwidget.h

@@ -485,6 +485,10 @@ protected:
     void mouseDoubleClickEvent(QMouseEvent *event);
     void mousePressEvent(QMouseEvent *event);
     void mouseReleaseEvent(QMouseEvent *event);
+
+    void dragEnterEvent(QDragEnterEvent *event);
+    void dropEvent(QDropEvent *event);
+
     // private slots:
 signals:
     void showMessage(const QString &message,int TimeOut = 0);