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/*

*

* This file is part of QMapControl,

* an open-source cross-platform map widget

*

* Copyright (C) 2007 - 2008 Kai Winter

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, either version 3 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 Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public License

* along with QMapControl. If not, see <http://www.gnu.org/licenses/>.

*

* Contact e-mail: kaiwinter@gmx.de

* Program URL   : http://qmapcontrol.sourceforge.net/

*

*/

#ifndef LAYERMANAGER_H

#define LAYERMANAGER_H

#include <QObject>

#include <QMap>

#include <QListIterator>

#include "layer.h"

#include "mapadapter.h"

#include "mapcontrol.h"

namespace qmapcontrol

{

    class Layer;

    class MapAdapter;

    class MapControl;

    class LayerManager;

    //! Handles Layers and viewport related settings

    /*!

     * This class handles internally all layers which were added to the MapControl.

     * It also stores values for scrolling.

     * It initiates the creation of a new offscreen image and on zooming the zoom images gets here created.

     *  @author Kai Winter <kaiwinter@gmx.de>

     */

    class LayerManager : public QObject

    {

        Q_OBJECT

    public:

        LayerManager(MapControl*, QSize);

        ~LayerManager();

        //! returns the coordinate of the center of the map

        /*!

         * @return returns the coordinate of the middle of the screen

         */

        QPointF currentCoordinate() const;

        //! returns the current offscreen image

        /*!

         * @return the current offscreen image

         */

        QPixmap getImage() const;

        //! returns the layer with the given name

        /*!

         * @param  layername name of the wanted layer

         * @return the layer with the given name

         */

        Layer* layer(const QString&) const;

        //! returns the base layer

        /*!

         * This will return the base layer of the LayerManager.

         * The base layer is the one which is used to do internal coordinate calculations.

         * @return the base layer

         */

        Layer* layer() const;

        //! returns the names of all layers

        /*!

         * @return returns a QList with the names of all layers

         */

        QList<QString> layers() const;

        //! sets the middle of the map to the given coordinate

        /*!

         * @param  coordinate the coordinate which the view´s middle should be set to

         */

        void setView(const QPointF& coordinate);

        //! sets the view, so all coordinates are visible

        /*!

         * @param  coordinates the Coorinates which should be visible

         */

        void setView(const QList<QPointF> coordinates);

        //! sets the view and zooms in, so all coordinates are visible

        /*!

         * The code of setting the view to multiple coordinates is "brute force" and pretty slow.

         * Have to be reworked.

         * @param  coordinates the Coorinates which should be visible

         */

        void setViewAndZoomIn (const QList<QPointF> coordinates);

        //! zooms in one step

        void zoomIn();

        //! zooms out one step

        void zoomOut();

        //! sets the given zoomlevel

        /*!

         * @param zoomlevel the zoomlevel

         */

        void setZoom(int zoomlevel);

        //! The Viewport of the display

        /*!

         * Returns the visible viewport in world coordinates

         * @return the visible viewport in world coordinates

         */

        QRectF getViewport() const;

        //! scrolls the view

        /*!

         * Scrolls the view by the given value in pixels and in display coordinates

         * @param  offset the distance which the view should be scrolled

         */

        void scrollView(const QPoint& offset);

        //! forwards mouseevents to the layers

        /*!

         * This method is invoked by the MapControl which receives Mouse Events.

         * These events are forwarded to the layers, so they can check for clicked geometries.

         * @param  evnt the mouse event

         */

        void mouseEvent(const QMouseEvent* evnt);

        //! returns the middle of the map in projection coordinates

        /*!

         *

         * @return the middle of the map in projection coordinates

         */

        QPoint getMapmiddle_px() const;

        void forceRedraw();

        void removeZoomImage();

        //! adds a layer

        /*!

         * If multiple layers are added, they are painted in the added order.

         * @param layer the layer which should be added

         */

        void addLayer(Layer* layer);

        //! returns the current zoom level

        /*!

         * @return returns the current zoom level

         */

        int currentZoom() const;

        void drawGeoms(QPainter* painter);

        void drawImage(QPainter* painter);

    private:

        LayerManager& operator=(const LayerManager& rhs);

        LayerManager(const LayerManager& old);

        //! This method have to be invoked to draw a new offscreen image

        /*!

         * @param clearImage if the current offscreeen image should be cleared

         * @param showZoomImage if a zoom image should be painted

         */

        void newOffscreenImage(bool clearImage=true, bool showZoomImage=true);

        inline bool checkOffscreen() const;

        inline bool containsAll(QList<QPointF> coordinates) const;

        inline void moveWidgets();

        inline void setMiddle(QList<QPointF> coordinates);

        MapControl* mapcontrol;

        QPoint screenmiddle; // middle of the screen

        QPoint scroll; // scrollvalue of the offscreen image

        QPoint zoomImageScroll; // scrollvalue of the zoom image

        QSize size; // widget size

        QSize offSize; // size of the offscreen image

        QPixmap composedOffscreenImage;

        QPixmap composedOffscreenImage2;

        QPixmap zoomImage;

        QList<Layer*>   mylayers;

        QPoint mapmiddle_px; // projection-display coordinates

        QPointF mapmiddle; // world coordinate

        QPoint whilenewscroll;

    public slots:

        void updateRequest(QRectF rect);

        void updateRequest();

        void resize(QSize newSize);

    };

}

#endif