diff -r 82baf59ce8dd -r ecf06a08d4d9 mpdata/src/mpcollectionalbumartmanager.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mpdata/src/mpcollectionalbumartmanager.cpp	Mon May 03 12:29:20 2010 +0300
@@ -0,0 +1,216 @@
+
+
+
+/*
+* 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: Music Player collection album art manager.
+*
+*/
+
+#include <thumbnailmanager_qt.h>
+#include <hbicon.h>
+
+#include "mpcollectionalbumartmanager.h"
+#include "mpmpxcollectiondata.h"
+#include "mptrace.h"
+
+const int KInitCacheSize = 10;
+const int KMaxCacheSize = 50;
+
+/*!
+    \class MpCollectionAlbumArtManager
+    \brief Music Player collection album art manager.
+
+    Collection album art manager provides access to album art needed for
+    display in certain collection views. It hides interface to the thumbnail
+    manager and also implements a caching mechanism for performance reasons.
+*/
+
+/*!
+    \fn void albumArtReady( int index )
+
+    This signal is emitted when album art for \a index is ready.
+
+    \sa getAlbumArt()
+ */
+
+/*!
+    \fn void albumCacheReady()
+
+    This signal is emitted when album art cache is ready.
+
+    \sa cacheAlbumArt()
+ */
+
+/*!
+ Constructs the album art manager.
+ */
+MpCollectionAlbumArtManager::MpCollectionAlbumArtManager( MpMpxCollectionData *data, QObject *parent )
+    : QObject(parent),
+      mCollectionData(data),
+      mThumbnailManager(0),
+      mCachingInProgress(false),
+      mDefaultIcon(0),
+      mPendingRequest(false)
+{
+    TX_ENTRY
+    mThumbnailManager = new ThumbnailManager(this);
+    mThumbnailManager->setMode(ThumbnailManager::Default);
+    mThumbnailManager->setQualityPreference(ThumbnailManager::OptimizeForQuality);
+    mThumbnailManager->setThumbnailSize(ThumbnailManager::ThumbnailSmall);
+
+    connect( mThumbnailManager, SIGNAL(thumbnailReady(QPixmap, void *, int, int)),
+             this, SLOT(thumbnailReady(QPixmap, void *, int, int)) );
+
+    mImageCache.setMaxCost(KMaxCacheSize);
+    //TODO: Change to final resource when available
+    HbIcon albumArt( "qtg_large_music" );
+    mDefaultIcon = new QIcon( albumArt.qicon() );
+    TX_EXIT
+}
+
+/*!
+ Destructs the album art manager.
+ */
+MpCollectionAlbumArtManager::~MpCollectionAlbumArtManager()
+{
+    TX_ENTRY
+    cancel();
+    delete mThumbnailManager;
+    delete mDefaultIcon;
+    TX_EXIT
+}
+
+/*!
+ Returns the album art for the given \a index. If the album art is not
+ available in its cache, an asynchronous request is made to the thumbnail manager
+ and default icon is returned.
+
+ \sa signal albumArtReady
+ */
+const QIcon* MpCollectionAlbumArtManager::albumArt( int index )
+{
+    TX_ENTRY_ARGS("index=" << index);
+    QIcon *icon = mImageCache[index];
+    if ( !icon ) {
+        icon = mDefaultIcon;
+        if ( !mRequestQueue.contains(index) ) {
+            // Icon was not found in cache. If the item has AlbumArtUri, request it
+            // through ThumbnailManager interface.
+            QString albumArtUri = mCollectionData->itemData(index, MpMpxCollectionData::AlbumArtUri);
+            if ( !albumArtUri.isEmpty() ) {
+                if ( !mPendingRequest ) {
+                    void *clientData = reinterpret_cast<void *>(index);
+                    mRequestId = mThumbnailManager->getThumbnail( albumArtUri, clientData );
+                    if ( mRequestId != -1 ) {
+                        mPendingRequest = true;
+                        TX_EXIT_ARGS("false - album art requested");
+                    }
+                    else {
+                        TX_EXIT_ARGS("Err: thumbnail manager returned (-1) for getThumbnail request!");
+                    }
+                }
+                else {
+                    mRequestQueue.append( index );
+                    TX_EXIT_ARGS("false - request queued");
+                }
+            }
+        }
+    }
+    return icon;
+}
+
+/*!
+ Before providing the new data to the view (list, grid, etc.), we want
+ to make sure that we have enough album arts for the first screen.
+ */
+void MpCollectionAlbumArtManager::cacheFirstScreen()
+{
+    TX_ENTRY
+    int count = mCollectionData->count();
+    int initCount = ( count > KInitCacheSize ) ? KInitCacheSize : count;
+    for ( int i = 0; i < initCount; i++ ) {
+        albumArt(i);
+    }
+    if ( mPendingRequest ) {
+        mCachingInProgress = true;
+    }
+    TX_EXIT
+}
+
+/*!
+ Cancels all outstanding album art requests.
+
+ \sa getAlbumArt, cacheAlbumArt
+ */
+void MpCollectionAlbumArtManager::cancel()
+{
+    TX_ENTRY
+    if ( mPendingRequest ) {
+        mThumbnailManager->cancelRequest(mRequestId);
+    }
+    mImageCache.clear();
+    mRequestQueue.clear();
+    mPendingRequest = false;
+    mCachingInProgress = false;
+    TX_EXIT
+}
+
+/*!
+ Slot to be called when thumbnail bitmap generation or loading is complete.
+ */
+void MpCollectionAlbumArtManager::thumbnailReady( QPixmap pixmap, void *data, int id, int error )
+{
+    int index = reinterpret_cast<int>(data);
+    TX_ENTRY_ARGS("index=" << index << ", id=" << id << ", error=" << error);
+    if ( !error && id == mRequestId && !pixmap.isNull() ) {
+        // Find the index
+        mImageCache.insert(index, new QIcon(pixmap));
+        TX_LOG_ARGS("Album art ready for index=" << index);
+        if ( !mCachingInProgress ) {
+            emit albumArtReady(index);
+        }
+    }
+    else {
+        TX_EXIT_ARGS("Err: thumbnail manager returned error for getThumbnail request!");
+    }
+
+    if ( mCachingInProgress ) {
+        if ( index >= (KInitCacheSize - 1) || !mRequestQueue.count() ) {
+            mCachingInProgress = false;
+            for ( int i = 0; i <= KInitCacheSize; ++i ) {
+                if ( mImageCache.contains(i) ) {
+                    emit albumArtReady(i);
+                }
+            }
+        }
+    }
+
+    mPendingRequest = false;
+    if ( mRequestQueue.count() ) {
+        int index = mRequestQueue.takeFirst();
+        QString albumArtUri = mCollectionData->itemData(index, MpMpxCollectionData::AlbumArtUri);
+        void *clientData = reinterpret_cast<void *>(index);
+        mRequestId = mThumbnailManager->getThumbnail( albumArtUri, clientData );
+        if ( mRequestId != -1 ) {
+            mPendingRequest = true;
+            TX_EXIT_ARGS("next album art requested");
+        }
+        else {
+            TX_EXIT_ARGS("Err: thumbnail manager returned (-1) for getThumbnail request!");
+        }
+    }
+    TX_EXIT
+}
+