--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/videocollection/videocollectionwrapper/src/videothumbnailfetcher.cpp	Fri Apr 16 14:59:52 2010 +0300
@@ -0,0 +1,268 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+*
+* Description: VideoThumbnailFetcher class implementation
+*
+*/
+
+// INCLUDE FILES
+
+#include <qpixmap.h>
+#include <thumbnailmanager_qt.h>
+
+#include "videothumbnailfetcher.h"
+
+// ================= MEMBER FUNCTIONS =======================
+//
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::VideoThumbnailFetcher()
+// -----------------------------------------------------------------------------
+//
+VideoThumbnailFetcher::VideoThumbnailFetcher() :
+    mThumbnailManager(0),
+    mPaused(false),
+    mTbnCreationEnabled(true)
+{
+    mThumbnailManager = new ThumbnailManager();
+    mThumbnailManager->setThumbnailSize(ThumbnailManager::ThumbnailMedium);
+    mThumbnailManager->setQualityPreference(ThumbnailManager::OptimizeForPerformance);
+    mThumbnailManager->setMode(ThumbnailManager::CropToAspectRatio);
+    
+    connect(mThumbnailManager, SIGNAL(thumbnailReady( QPixmap , void * , int , int )),
+                this, SLOT(thumbnailReadySlot( QPixmap , void * , int , int )));
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::~VideoThumbnailFetcher()
+// -----------------------------------------------------------------------------
+//
+VideoThumbnailFetcher::~VideoThumbnailFetcher()
+{
+    cancelFetches();
+
+    disconnect(mThumbnailManager, SIGNAL(thumbnailReady( QPixmap , void * , int , int )),
+                this, SLOT(thumbnailReadySlot( QPixmap , void * , int , int )));
+    
+    delete mThumbnailManager;
+    mThumbnailManager = 0;
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::addFetch()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::addFetch(const QString fileName, void *internal, int priority)
+{
+    ThumbnailFetchData *fetch = new ThumbnailFetchData;
+    fetch->mFileName = fileName;
+    fetch->mInternal = internal;
+    fetch->mPriority = priority;
+    mFetchList.append(fetch);
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::continueFetching()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::continueFetching()
+{
+    mPaused = false;
+    
+    // First fetch all thumbnails that have been created already, next
+    // start thumbnail creation for one thumbnail at a time. 
+    if(!mFetchList.isEmpty())
+    {
+        startThumbnailFetches();
+    }
+    else if(!mCreationList.isEmpty())
+    {
+        startThumbnailCreation();
+    }
+
+    // All thumbnails have been fetched, report it.
+    if(mFetchList.isEmpty() && mCreationList.isEmpty() && mStartedFetchList.isEmpty())
+    {
+        emit allThumbnailsFetched();
+    }
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::startThumbnailFetches()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::startThumbnailFetches()
+{
+    if(!mThumbnailManager)
+        return;
+    
+    // Only fetch those thumbnails that are already been created.
+    mThumbnailManager->setMode(ThumbnailManager::DoNotCreate);
+    
+    // Push all from thumbnail manager.
+    while(!mFetchList.isEmpty())
+    {
+        ThumbnailFetchData *fetch = mFetchList.takeFirst();
+
+        int requestId = mThumbnailManager->getThumbnail(fetch->mFileName,
+               fetch->mInternal, fetch->mPriority);
+        
+        if(requestId != -1)
+        {
+            // Request succeed, add to list of started fetches.
+            mStartedFetchList.insert(requestId, fetch);
+        }
+        else
+        {
+            // Request failed, free internal data.
+            delete fetch->mInternal;
+            delete fetch;
+        }
+    }
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::startThumbnailCreation()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::startThumbnailCreation()
+{
+    if(!mThumbnailManager || !mTbnCreationEnabled)
+        return;
+    
+    mThumbnailManager->setMode(ThumbnailManager::CropToAspectRatio);
+    
+    // Do nothing if list is empty. 
+    if(mCreationList.isEmpty())
+        return;
+    
+    // Find fetch with highest priority. 
+    int highestPriority = 0;
+    int indexWithHighestPriority = 0;
+    
+    for(int i = 0; i < mCreationList.count(); i++)
+    {
+        if(mCreationList.at(i)->mPriority > highestPriority)
+        {
+            indexWithHighestPriority = i;
+            highestPriority = mCreationList.at(i)->mPriority;
+        }
+    }
+    
+    ThumbnailFetchData *fetch = mCreationList.takeAt(indexWithHighestPriority);
+    
+    // Do request to thumbnail manager.
+    int requestId = mThumbnailManager->getThumbnail(fetch->mFileName,
+            fetch->mInternal, fetch->mPriority);
+    
+    // Request failed, free internal data.
+    if(requestId == -1)
+    {
+        delete fetch->mInternal;
+        delete fetch;
+    }
+    else 
+    {
+        // Don't keep track of fetches when creating thumbnails, if
+        // it fails with -1 it would be only tried to create again.  
+        delete fetch;
+    }
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::pauseFetching()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::pauseFetching()
+{
+    mPaused = true;
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::cancelFetches()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::cancelFetches()
+{
+    // Clear list of started fetches, thumbnail manager has the internal 
+    // pointer.
+    QList<int> keys = mStartedFetchList.keys();
+    for(int i = 0; i < keys.count(); i++ )
+    {
+        delete mStartedFetchList.take(keys[i]);
+    }
+    
+    // Merge lists and free data.
+    mFetchList.append(mCreationList);
+    mCreationList.clear();
+    while(!mFetchList.isEmpty())
+    {
+        ThumbnailFetchData *fetch = mFetchList.takeFirst();
+        delete fetch->mInternal;
+        delete fetch;
+    }
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::fetchCount()
+// -----------------------------------------------------------------------------
+//
+int VideoThumbnailFetcher::fetchCount()
+{
+    return mFetchList.count() + mCreationList.count() + mStartedFetchList.count();
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::enableThumbnailCreation()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::enableThumbnailCreation(bool enable)
+{
+    mTbnCreationEnabled = enable;
+}
+
+// -----------------------------------------------------------------------------
+// VideoThumbnailFetcher::thumbnailReadySlot()
+// -----------------------------------------------------------------------------
+//
+void VideoThumbnailFetcher::thumbnailReadySlot(QPixmap tnData, void *internal, int requestId, int error)
+{
+    // Thumbnail has not been generated yet, put it into creation list.
+    if(error == -1 && internal)
+    {
+        if(mStartedFetchList.contains(requestId))
+        {
+            ThumbnailFetchData *fetch = mStartedFetchList.take(requestId);
+            mCreationList.append(fetch);
+        }
+        else
+        {
+            // Fetch data was not found, meaning cancelFetches was called.
+            delete internal;
+        }
+    }
+    else
+    {
+        // Report that thumbnail was fetched.
+        emit thumbnailReady(tnData, internal, error);
+        
+        if(mStartedFetchList.contains(requestId))
+            delete mStartedFetchList.take(requestId);
+    }
+    
+    // Continue the fetching process.
+    if(!mPaused && mStartedFetchList.isEmpty())
+        continueFetching();
+}
+
+// End of file.