Moved dummy implementation of DocumentObserver in observer.cpp,

so we are free to change behaviour later.

API & documentation cleanup

@pinto Can you check the comments please, whether they are correct?

svn path=/trunk/playground/graphics/okular/; revision=610731

CMakeLists.txt

@@ -36,6 +36,7 @@ set(okularcore_SRCS
    core/document.cpp
    core/generator.cpp
    core/link.cpp
+   core/observer.cpp
    core/page.cpp
    core/pagetransition.cpp
    core/rotationjob.cpp

core/observer.cpp

@@ -0,0 +1,42 @@
+/***************************************************************************
+ *   Copyright (C) 2005 by Enrico Ros <eros.kde@email.it>                  *
+ *   Copyright (C) 2005 by Albert Astals Cid <tsdgeos@terra.es>            *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#include "observer.h"
+
+using namespace Okular;
+
+DocumentObserver::~DocumentObserver()
+{
+}
+
+void DocumentObserver::notifySetup( const QVector< Okular::Page * >&, bool )
+{
+}
+
+void DocumentObserver::notifyViewportChanged( bool )
+{
+}
+
+void DocumentObserver::notifyPageChanged( int, int )
+{
+}
+
+void DocumentObserver::notifyContentsCleared( int )
+{
+}
+
+void DocumentObserver::notifyVisibleRectsChanged()
+{
+}
+
+bool DocumentObserver::canUnloadPixmap( int ) const
+{
+    return true;
+}

core/observer.h

@@ -52,7 +52,7 @@ class DocumentObserver
         /**
          * Destroys the document observer.
          */
-        virtual ~DocumentObserver() {};
+        virtual ~DocumentObserver();
 
         /**
          * Must return an unique ID for each observer (used for notifications).
@@ -83,14 +83,49 @@ class DocumentObserver
             VisibleAreas = 16     ///< The visible are changed
         };
 
-        virtual void notifySetup( const QVector< Okular::Page * > &/*pages*/, bool /*documentChanged*/ ) {};
+        /**
-        virtual void notifyViewportChanged( bool /*smoothMove*/ ) {};
+         * This method is called whenever the document is initialized or reconstructed.
-        virtual void notifyPageChanged( int /*pageNumber*/, int /*changedFlags*/ ) {};
+         *
-        virtual void notifyContentsCleared( int /*changedFlags*/ ) {};
+         * @param pages The vector of pages of the document.
-        virtual void notifyVisibleRectsChanged() {};
+         * @param documentChanged If true, the document is reconstructed.
+         */
+        virtual void notifySetup( const QVector< Okular::Page * > &pages, bool documentChanged );
+
+        /**
+         * This method is called whenever the viewport has been changed.
+         *
+         * @param smoothMove If true, the move shall be animated.
+         */
+        virtual void notifyViewportChanged( bool smoothMove );
+
+        /**
+         * This method is called whenever the content on @p page described by the
+         * passed @p flags has been changed.
+         */
+        virtual void notifyPageChanged( int page, int flags );
+
+        /**
+         * This method is called whenever the content described by the passed @p flags
+         * has been cleared.
+         */
+        virtual void notifyContentsCleared( int flags );
+
+        /**
+         * This method is called whenever the visible rects have been changed.
+         */
+        virtual void notifyVisibleRectsChanged();
+
+        /**
+         * Returns whether the observer agrees that all pixmaps for the given
+         * @p page can be unloaded to improve memory usage.
+         *
+         * Returns true per default.
+         */
+        virtual bool canUnloadPixmap( int page ) const;
 
-        // queries to observers
+    private:
-        virtual bool canUnloadPixmap( int /*pageNum*/ ) const { return true; }
+        class Private;
+        Private* d;
 };
 
 }