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+/*  This file is part of the KDE project
+    Copyright (C) 2001-2002 Matthias Kretz <kretz@kde.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License version 2
+    as published by the Free Software Foundation.
+
+    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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+*/
+// $Id$
+
+#ifndef _KIMAGECANVAS_H
+#define _KIMAGECANVAS_H
+
+#include "kimageviewer/canvas.h"
+
+#include <qscrollview.h>
+#include <qwmatrix.h>
+#include <qcursor.h>
+#include <qrect.h>
+
+#include <kdemacros.h>
+
+class KImageHolder;
+class QColor;
+class QImage;
+class KPixmap;
+
+/**
+ * @short KViewCanvas
+ * @author Matthias Kretz <kretz@kde.org>
+ * @version $Id$
+ */
+class KDE_EXPORT KImageCanvas : public QScrollView, public KImageViewer::Canvas
+{
+	Q_OBJECT
+	public:
+		/**
+		 * KImageCanvas Constructor
+		 */
+		KImageCanvas( QWidget * parent, const char * name, const QStringList & args );
+
+		/**
+		 * KImageCanvas Destructor
+		 */
+		virtual ~KImageCanvas();
+
+		/**
+		 * set the background color of the canvas
+		 */
+		void setBgColor( const QColor & );
+
+		/**
+		 * returns the current background color
+		 */
+		const QColor & bgColor() const;
+
+		/**
+		 * the depth of the contained image
+		 */
+		int imageDepth() const;
+
+		/**
+		 * the size of the unzoomed image
+		 */
+		QSize imageSize() const;
+
+		/**
+		 * the size of the zoomed (current) image
+		 */
+		QSize currentSize() const;
+
+		/**
+		 * returns the zoom factor
+		 */
+		double zoom() const { return m_zoom; }
+
+		/**
+		 * returns the current (unzoomed) image
+		 */
+		const QImage * image() const;
+
+		/**
+		 * Scrolls the content so that the point (x, y) is in the top-left corner.
+		 */
+		void setXYOffset( int x, int y ) { setContentsPos( x, y ); }
+
+		/**
+		 * Returns the leftmost visible X coordinate of the image.
+		 */
+		int xOffset() const { return contentsX(); }
+
+		/**
+		 * Returns the topmost visible Y coordinate of the image.
+		 */
+		int yOffset() const { return contentsY(); }
+
+		/**
+		 * Returns whether to use fast or smooth scaling
+		 */
+		bool fastScale() const { return m_fastscale; }
+
+		/**
+		 * Return whether the image should always be centered.
+		 */
+		bool centered() const { return m_bCentered; }
+
+		/**
+		 * Return the selected rectangle
+		 */
+		QRect selection() const;
+
+		/**
+		 * Returns whether the aspect ratio of the image is kept
+		 */
+		bool keepAspectRatio() const { return m_keepaspectratio; }
+
+		/**
+		 * @return the number of available blend effects
+		 */
+		unsigned int numOfBlendEffects() const;
+
+		/**
+		 * @return the description of the blend effect
+		 */
+		QString blendEffectDescription( unsigned int ) const;
+
+		/**
+		 * @return the current maximum image size
+		 */
+		const QSize & maximumImageSize() const { return m_maxsize; }
+
+		/**
+		 * @return the current minimum image size
+		 */
+		const QSize & minimumImageSize() const { return m_minsize; }
+
+		/**
+		 * @return a pointer to the QWidget interface of this object
+		 */
+		QWidget * widget() { return static_cast<QWidget *>( this ); }
+
+		bool eventFilter( QObject *, QEvent * );
+
+	signals:
+		/**
+		 * a mouse button was pressed and a context menu should be openend
+		 */
+		void contextPress( const QPoint& );
+
+		/**
+		 * the size of the image has changed (a new image was loaded, or the
+		 * image was zoomed or cropped)
+		 *
+		 * it passes the new size of the image
+		 */
+		void imageSizeChanged( const QSize & );
+
+		/**
+		 * The zoom of the image has changed.
+		 */
+		void zoomChanged( double zoom );
+
+		/**
+		 * The selection has changed. Connect to this signal if you want to
+		 * do something with a selection of the image (e.g. crop).
+		 */
+		void selectionChanged( const QRect & );
+
+		/**
+		 * Emitted when an image is finished being shown. If a blend effect is being used
+		 * the signal is emitted when the effect is finished.
+		 */
+		void showingImageDone();
+
+		/**
+		 * This signal is emitted whenever the canvas changes between image/no-image. For
+		 * example, if someone calls @ref clear() hasImage( false ) is emitted if an image
+		 * was shown before.
+		 */
+		void hasImage( bool );
+
+		/**
+		 * Some methods of the canvas not only change the way the image is shown (e.g. zoom)
+		 * but also change the image itself (e.g. rotation) - @ref image() returns something
+		 * different. If such a change happens this signal is emitted.
+		 * It is not emitted when a new image is set with the @ref setImage() methods.
+		 */
+		void imageChanged();
+
+		/**
+		 * The current mouse cursor position on the image.
+		 */
+		void cursorPos( const QPoint & );
+
+	public slots:
+		/**
+		 * Set if the image should always be centered if the canvas is
+		 * bigger than the image.
+		 */
+		void setCentered( bool );
+
+		/**
+		 * give the canvas a new image to show. The zoom level is kept.
+		 */
+		void setImage( const QImage & );
+
+		/**
+		 * Give the canvas a new image to show.
+		 *
+		 * You have to pass the size the image should have when it appears
+		 * on screen.
+		 */
+		void setImage( const QImage &, const QSize & );
+
+		/**
+		 * set the zoom to be used when showing the image
+		 */
+		void setZoom( double );
+
+		/**
+		 * Fit the image into the requested width and height.
+		 */
+		void boundImageTo( const QSize & size );
+
+		/**
+		 * Set the maximum size of the image. If this is set the image will
+		 * never exceed this size.
+		 *
+		 * If you set this to 0x0 the image size may be as big as possible
+		 */
+		void setMaximumImageSize( const QSize & );
+
+		/**
+		 * Set the minimum size of the image. If this is set the image will
+		 * never be smaller than this size.
+		 *
+		 * If you set this to 0x0 the image size can be as small as possible
+		 */
+		void setMinimumImageSize( const QSize & );
+
+		/**
+		 * Resize the image to the given size. It will keep the aspect ratio
+		 * as long as keepAspectRatio is true (default). The image will be as
+		 * large as possible within the given constraints.
+		 */
+		void resizeImage( const QSize & );
+
+		/**
+		 * Hides the scrollbars of the canvas. It's still possible to scroll
+		 * by moving the image with the mouse.
+		 */
+		void hideScrollbars( bool );
+
+		/**
+		 * Changes the zoom behaviour: Normally the aspect ratio of the image
+		 * won't change, but if you want to allow it you may do.
+		 */
+		void setKeepAspectRatio( bool );
+
+		/**
+		 * If the canvas supports different methods for scaling you may
+		 * switch between fast and smooth scaling.
+		 *
+		 * It defaults to smooth scaling.
+		 */
+		void setFastScale( bool );
+
+		/**
+		 * clears the canvas (no image loaded)
+		 */
+		void clear();
+
+		/**
+		 * flip the image horizontally
+		 */
+		void flipHorizontal( bool change = false );
+
+		/**
+		 * flip the image vertically
+		 */
+		void flipVertical( bool change = false );
+
+		/**
+		 * rotate the image a degrees counterclockwise
+		 */
+		void rotate( double a, bool change = false );
+
+	protected:
+		void checkBounds( QSize & newsize );
+		void zoomFromSize( const QSize & );
+		void sizeFromZoom( double );
+		void updateImage();
+
+		void mouseMoveEvent( QMouseEvent * );
+		void resizeEvent( QResizeEvent * );
+		void contentsMousePressEvent( QMouseEvent * );
+		void contentsWheelEvent( QWheelEvent * );
+		void keyPressEvent( QKeyEvent * );
+		void timerEvent( QTimerEvent * );
+
+	protected slots:
+		void slotUpdateImage();
+		void hideCursor();
+		void slotImageChanged();
+		void loadSettings();
+
+	private slots:
+		void selected( const QRect & ); // map rect to unzoomed rect
+		void mapCursorPos( const QPoint & );
+
+	private:
+		enum BlendEffect {
+			NoBlending = 0,
+			WipeFromLeft = 1,
+			WipeFromRight = 2,
+			WipeFromTop = 3,
+			WipeFromBottom = 4,
+			AlphaBlend = 5
+		};
+		const KPixmap pixmap();
+		void sizeChanged();
+		void matrixChanged();
+		void center();
+		void finishNewClient();
+		KImageHolder * createNewClient();
+
+		KImageHolder * m_client;
+		KImageHolder * m_oldClient;
+		QImage * m_image; //unzoomed copy of the current image
+		QImage * m_imageTransformed; //xForm( m_matrix ) copy of the current image
+		KPixmap * m_pixmap; //copy of the current pixmap (if ( m_fastscale ) it's unzoomed else it's m_imageTransformed.smoothScale()d)
+
+		QTimer * m_pTimer; // timer for single shot to hide the cursor
+		QCursor m_cursor; // the cursor show in the canvas (for auto-hiding)
+
+		QWMatrix m_matrix; // the current transformation matrix
+		QSize m_maxsize, m_minsize;
+		QSize m_currentsize;
+
+		double m_zoom;
+		bool m_fastscale;
+		bool m_keepaspectratio;
+		bool m_bImageChanged;
+		bool m_bSizeChanged;
+		bool m_bMatrixChanged;
+		bool m_bNeedNewPixmap;
+		bool m_bCentered;
+		bool m_bImageUpdateScheduled;
+		bool m_bNewImage;
+		int m_iBlendTimerId;
+
+		QRect m_selection; //unzoomed selection rect
+};
+
+// vim:sw=4:ts=4
+
+#endif // _KIMAGECANVAS_H