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/***************************************************************************
* Copyright (C) 2003 by S�astien Laot *
* slaout@linux62.org *
* *
* 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. *
* *
* 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. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#ifndef BACKGROUNDMANAGER_H
#define BACKGROUNDMANAGER_H
#include <qobject.h>
#include <qvaluelist.h>
#include <qstring.h>
#include <qpixmap.h>
#include <qcolor.h>
#include <qtimer.h>
/** A node in the list of background images of BackgroundManager.
* It can only be used by BackgroundManager because it is an internal structure of this manager.
* @author S�astien Laot
*/
class BackgroundEntry
{
friend class BackgroundManager;
protected:
BackgroundEntry(const QString &location);
~BackgroundEntry();
QString name;
QString location;
bool tiled; /// << Only valid after some object subscribed to this image! Because it's only read at this time.
QPixmap *pixmap; /// << Only valid (non-null) after some object subscribed to this image! Because it's only read at this time.
QPixmap *preview; /// << Only valid (non-null) after some object requested the preview.
int customersCount;
};
/** A node in the list of opaque background images (with a background color applyed to an image) of BackgroundManager.
* It can only be used by BackgroundManager because it is an internal structure of this manager.
* @author S�astien Laot
*/
class OpaqueBackgroundEntry
{
friend class BackgroundManager;
protected:
OpaqueBackgroundEntry(const QString &name, const QColor &color);
~OpaqueBackgroundEntry();
QString name;
QColor color;
QPixmap *pixmap;
int customersCount;
};
/** Manage the list of background images.
* BASIC FUNCTIONNING OF A BACKGROUND CHOOSER:
* It get all image names with imageNames() to put them in eg. a QComboBox and then,
* when it's time to get the preview of an image it call preview() with the image name to get it.
* Preview are only computed on demand and then cached to fast the next demands (only the pointer will have to be returned).
* Previews are scalled to fit in a rectangle of 100 by 75 pixels, and with a white background color.
* They are also saved to files, so that the scalling/opaquification has not to be done later (they will be directly loaded from file).
* Previews are saved in Global::backgroundsFolder()+"previews/", so that emptying the folder is sufficient to remove them.
* BASIC FUNCTIONNING OF AN IMAGE REQUESTER:
* When eg. a basket is assigned an image name, it register it with subscribe().
* The full pixmap is then loaded from file and cached (if it was not already loaded) and the "tiled" property is read from the image configuration file.
* If this object want to have the pixmap applyed on a background color (for no transparency => really faster drawing),
* it should register for the couple (imageName,color) with suscribe(): the pixmap will be created in the cache.
* Then, the object can get the subscribed images with pixmap() or opaquePixmap() and know if it's tiled with tiled().
* When the user removed the object background image (or when the object/basket/... is removed), the object should call unsubscribe() for
* EVERY subscribed image and image couples. Usage count is decreased for those images and a garbage collector will remove the cached images
* if nothing is subscribed to them (to free memory).
* @author S�astien Laot
*/
class BackgroundManager : private QObject
{
Q_OBJECT
private:
/// LIST OF IMAGES:
typedef QValueList<BackgroundEntry*> BackgroundsList;
typedef QValueList<OpaqueBackgroundEntry*> OpaqueBackgroundsList;
public:
/// CONTRUCTOR AND DESTRUCTOR:
BackgroundManager();
~BackgroundManager();
/// SUBSCRIPTION TO IMAGES:
bool subscribe(const QString &image); /// << @Return true if the loading is a success. In the counter-case, calling methods below is unsafe with this @p image name.
bool subscribe(const QString &image, const QColor &color); /// << Idem.
void unsubscribe(const QString &image);
void unsubscribe(const QString &image, const QColor &color);
/// GETTING THE IMAGES AND PROPERTIES:
QPixmap* pixmap(const QString &image);
QPixmap* opaquePixmap(const QString &image, const QColor &color);
bool tiled(const QString &image);
/// LIST OF IMAGES AND PREVIEWS:
bool exists(const QString &image);
QStringList imageNames();
QPixmap* preview(const QString &image);
/// USED FOR EXPORTATION:
QString pathForImageName(const QString &image); /// << It is STRONGLY advised to not use those two methods unless it's to copy (export) the images or something like that...
QString previewPathForImageName(const QString &image);
/// USED FOR IMPORTATION:
void addImage(const QString &fullPath);
private:
BackgroundEntry* backgroundEntryFor(const QString &image);
OpaqueBackgroundEntry* opaqueBackgroundEntryFor(const QString &image, const QColor &color);
private:
BackgroundsList m_backgroundsList;
OpaqueBackgroundsList m_opaqueBackgroundsList;
QTimer m_garbageTimer;
private slots:
void requestDelayedGarbage();
void doGarbage();
};
#endif // BACKGROUNDMANAGER_H
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