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dpimage.h

/***************************************************************************
 *   Copyright (C) 2006 by David Saxton                                    *
 *   david@bluehaze.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.                                   *
 ***************************************************************************/

#ifndef DPIMAGE_H
#define DPIMAGE_H

#include "drawpart.h"

#include <qimage.h>
#include <qpixmap.h>
#include <qthread.h>

/**
@short Thread to perform quick and then good image scaling.
@author David Saxton
*/
00024 class ImageScaleThread : public QThread
{
      public:
            enum BestScaling { Unscaled, NormalScaled, SmoothScaled };
            
            ImageScaleThread();
            /**
             * Use the given settings.
             * @return if any of the settings changed.
             */
            bool updateSettings( const QString & imageURL, int width, int height );
            /**
             * @param scaling is set to the type of scaling that this image has had.
             * @return the best image done so far.
             */
            QImage bestScaling( BestScaling * scaling = 0 ) const;
            
      protected:
            /**
             * Start scaling.
             */
            virtual void run();
            
            QImage m_image;
            QImage m_normalScaled;
            QImage m_smoothScaled;
            
            bool m_bDoneNormalScale;
            bool m_bDoneSmoothScale;
            
            int m_width;
            int m_height;
            QString m_imageURL;
            bool m_bSettingsChanged;
};


/**
@short Represents editable text on the canvas
@author David Saxton
 */
00065 class DPImage : public DrawPart
{
      Q_OBJECT
      public:
            DPImage( ItemDocument *itemDocument, bool newItem, const char *id = 0L );
            ~DPImage();

            static Item* construct( ItemDocument *itemDocument, bool newItem, const char *id );
            static LibraryItem *libraryItem();

            virtual void setSelected( bool yes );

      protected:
            virtual void postResize();
            
      protected slots:
            /**
             * Called from a timeout event after resizing to see if the image
             * resizing thread has done anything useful yet.
             */
            void checkImageScaling();
      
      private:
            virtual void drawShape( QPainter &p );
            void dataChanged();
            
            ImageScaleThread::BestScaling m_imageScaling;
            QPixmap m_image;
            ImageScaleThread m_imageScaleThread;
            RectangularOverlay * m_pRectangularOverlay;
            QTimer * m_pCheckImageScalingTimer;
            QString m_imageURL;
            bool m_bSettingsChanged;
            
            /**
             * If we have been loaded from a file, etc, then we want to keep the
             * previous size instead of resizing ourselves to the new image size
             * like we would do normally if the user loads an image.
             */
00104             bool m_bResizeToImage;
};

#endif

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