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itemview.h

/***************************************************************************
 *   Copyright (C) 2005-2006 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 ITEMVIEW_H
#define ITEMVIEW_H

#include <view.h>

#include <canvas.h>
#include <qguardedptr.h>

class Canvas;
class CVBEditor;
class Item;
class ItemDocument;
class QTimer;

/**
@author David Saxton
*/
00028 class ItemView : public View
{
      Q_OBJECT
      public:
            ItemView( ItemDocument *itemDocument, ViewContainer *viewContainer, uint viewAreaId, const char *name = 0 );
            ~ItemView();

            virtual bool canZoomIn() const;
            virtual bool canZoomOut() const;
            CVBEditor *cvbEditor() const { return m_CVBEditor; }
            /**
             * @returns The zoom level
             */
00041             double zoomLevel() const { return m_zoomLevel; }
            /**
             * When the user drags from an item selector into the item view, the
             * item will be created and shown to the user. This function returns
             * that item.
             */
00047             Item * dragItem() const { return m_pDragItem; }
            /**
             * Zoom in. The point center will remain fixed.
             */
            void zoomIn( const QPoint & center );
            /**
             * Zoom in. The point center will remain fixed.
             */
            void zoomOut( const QPoint & center );
            /**
             * Converts a mouse click position (in the contents coordinates) to the
             * associated position on the canvas.
             */
            QPoint mousePosToCanvasPos( const QPoint & contentsClick ) const;

      public slots:
            void actualSize();
            void zoomIn();
            void zoomOut();
            void scrollToMouse( const QPoint &pos );
            virtual void updateStatus();

      protected slots:
            /**
             * Called when the user changes the configuration.
             */
            virtual void slotUpdateConfiguration();
            void startUpdatingStatus();
            void stopUpdatingStatus();

      protected:
            /**
             * If the user drags an acceptable item in (e.g. a component in a
             * circuit), then call this function to create the item and have it
             * moved when the user moves his mouse while dragging.
             */
            void createDragItem( QDragEnterEvent * event );
            void removeDragItem();
            void updateZoomActions();
            /**
             * Attempts to create a new CNItem if one was dragged onto the canvas
             */
            void dropEvent( QDropEvent * event );
            /**
             * Reinherit to allow different types of items to be dragged in.
             */
            virtual void dragEnterEvent( QDragEnterEvent * event );
            void dragLeaveEvent( QDragLeaveEvent * event );
            void dragMoveEvent( QDragMoveEvent * event );
            void contentsMousePressEvent( QMouseEvent *e );
            void contentsMouseReleaseEvent( QMouseEvent *e );
            void contentsMouseDoubleClickEvent( QMouseEvent *e );
            void contentsMouseMoveEvent( QMouseEvent *e );
            void contentsWheelEvent( QWheelEvent *e );
            void enterEvent( QEvent * e );
            void leaveEvent( QEvent * e );

            QGuardedPtr<ItemDocument> p_itemDocument;
            CVBEditor *m_CVBEditor;
            double m_zoomLevel;
            QTimer * m_pUpdateStatusTmr;
            Item * m_pDragItem;
      
            friend class CVBEditor;
};


/**
@author David Saxton
*/
00117 class CVBEditor : public QCanvasView
{
      Q_OBJECT
      public:
            CVBEditor( Canvas * canvas, ItemView *itemView, const char *name );
            
            void setPassEventsToView( bool pass ) { b_passEventsToView = pass; }
            virtual bool event( QEvent * e );
            virtual void contentsWheelEvent( QWheelEvent * e );
            /**
             * Updates the world matrix from ItmeView's zoom level and from Canvas'
             * offset.
             */
            void updateWorldMatrix();
            
      protected slots:
            void canvasResized( const QRect & oldSize, const QRect & newSize );
            
      protected:
            virtual void viewportResizeEvent( QResizeEvent * );
            ItemView *p_itemView;
            bool b_passEventsToView;
            bool b_ignoreEvents;
            Canvas * m_pCanvas;
};



#endif

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