20#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_VIEWUPDATE_HXX
21#define INCLUDED_SLIDESHOW_SOURCE_INC_VIEWUPDATE_HXX
Interface for something that can perform view updates.
virtual bool update()=0
Perform the update action on all views.
virtual bool needsUpdate() const =0
Query whether updates are pending.
::std::shared_ptr< ViewUpdate > ViewUpdateSharedPtr