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/* ============================================================
*
* This file is a part of digiKam project
* http://www.digikam.org
*
* Date : 2006-04-14
* Description : Load and cache tag thumbnails
*
* Copyright (C) 2006-2007 by Marcel Wiesweg <marcel.wiesweg@gmx.de>
*
* 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, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* ============================================================ */
#ifndef TAGTHUMBNAILLOADER_H
#define TAGTHUMBNAILLOADER_H
// TQt includes.
#include <tqobject.h>
#include <tqpixmap.h>
// KDE includes.
#include <kurl.h>
class TQCustomEvent;
namespace Digikam
{
class Album;
class TAlbum;
class PAlbum;
class AlbumThumbnailLoaderPrivate;
class AlbumThumbnailLoader : public TQObject
{
Q_OBJECT
public:
static AlbumThumbnailLoader *instance();
static void cleanUp();
/**
* Change the size of the thumbnails.
* If the size differs from the current size,
* signalReloadThumbnails will be emitted.
*/
void setThumbnailSize(int size);
/**
* Get the current default icon size
*/
int thumbnailSize() const;
/**
* Album thumbnail size is configurable via the settings menu.
* Some widgets use smaller icons than other widgets.
* These widgets do not need to know the currently set icon size from
* the setup and calculate a smaller size, but can simply request
* a relatively smaller icon.
* Depending on the user-chosen icon size, this size may in fact not
* be smaller than the normal size.
*/
enum RelativeSize
{
NormalSize,
SmallerSize
};
/**
* Request thumbnail for given album.
* The thumbnail will be loaded
* and returned asynchronously by the signals.
* If no thumbnail is associated with given album,
* no action will be taken, and false is returned.
*
*/
bool getAlbumThumbnail(PAlbum *album);
/**
* Behaves similar to the above method.
* Tag thumbnails will be processed as appropriate.
* Tags may have associated an icon that is loaded
* synchronously by the system icon loader.
* In this case, icon is set to this icon, and false is returned.
* If no icon is associated with the tag, icon is set to null,
* and false is returned.
* If a custom icon is associated with the tag,
* it is loaded asynchronously, icon is set to null,
* and true is returned.
* Tag thumbnails are always smaller than album thumbnails -
* as small as an album thumbnail with SmallerSize.
* They are supposed to be blended into the standard tag icon
* obtained below, or used as is when SmallerSize is requested anyway.
* @return Returns true if icon is loaded asynchronously.
*/
bool getTagThumbnail(TAlbum *album, TQPixmap &icon);
/**
* Return standard tag and album icons.
* The third methods check if album is the root,
* and returns the standard icon or the root standard icon.
*/
TQPixmap getStandardTagIcon(RelativeSize size = NormalSize);
TQPixmap getStandardTagRootIcon(RelativeSize size = NormalSize);
TQPixmap getStandardTagIcon(TAlbum *album, RelativeSize size = NormalSize);
TQPixmap getStandardAlbumIcon(RelativeSize size = NormalSize);
TQPixmap getStandardAlbumRootIcon(RelativeSize size = NormalSize);
TQPixmap getStandardAlbumIcon(PAlbum *album, RelativeSize size = NormalSize);
/**
* Blend tagIcon centered on dstIcon, where dstIcon is a standard
* icon of variable size and tagIcon is 12 pixels smaller.
* If height(dstIcon) < minBlendSize we return tagIcon verbatim.
*/
TQPixmap blendIcons(TQPixmap dstIcon, const TQPixmap &tagIcon);
signals:
/**
* This signal is emitted as soon as a thumbnail has become available
* for given album.
* This class is a singleton, so any object connected to this
* signal might not actually have requested a thumbnail for given url
*/
void signalThumbnail(Album *album, const TQPixmap&);
/** This signal is emitted if thumbnail generation for given album failed.
* Same considerations as above.
*/
void signalFailed(Album *album);
/**
* Indicates that all album and tag thumbnails need to be reloaded.
* This is usually because the icon size has changed in the setup.
*/
void signalReloadThumbnails();
protected slots:
void slotGotThumbnailFromIcon(const KURL&, const TQPixmap&);
void slotThumbnailLost(const KURL&);
void slotIconChanged(Album* album);
protected:
void customEvent(TQCustomEvent *e);
private:
AlbumThumbnailLoader();
~AlbumThumbnailLoader();
AlbumThumbnailLoaderPrivate *d;
static AlbumThumbnailLoader *m_instance;
void addURL(Album *album, const KURL &url);
TQPixmap loadIcon(const TQString &name, int size = 0);
TQPixmap createTagThumbnail(const TQPixmap &albumThumbnail);
int computeIconSize(RelativeSize size);
TQRect computeBlendRect(int iconSize);
};
} // namespace Digikam
#endif // TAGTHUMBNAILLOADER_H
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