/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2023-05-15
 * Description : geolocation engine based on Marble.
 *               (c) 2007-2022 Marble Team
 *               https://invent.kde.org/education/marble/-/raw/master/data/credits_authors.html
 *
 * SPDX-FileCopyrightText: 2023-2026 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 *
 * ============================================================ */

#pragma once

// Qt includes

#include <QWidget>

// Local includes

#include "GeoDataCoordinates.h"
#include "MarbleGlobal.h"             // types needed in all of marble.
#include "TileCoordsPyramid.h"
#include "digikam_export.h"

/**
 * This file contains the headers for MarbleWidget.
 */

class QPixmap;

namespace Marble
{

class AbstractDataPluginItem;
class AbstractFloatItem;
class GeoDataLatLonAltBox;
class GeoDataLatLonBox;
class GeoDataFeature;
class GeoDataPlacemark;
class GeoDataLookAt;
class GeoPainter;
class GeoSceneDocument;
class LayerInterface;
class MarbleModel;
class MarbleWidgetPopupMenu;
class MarbleWidgetInputHandler;
class MarbleWidgetPrivate;
class RenderPlugin;
class ParseRunnerPlugin;
class RenderState;
class TextureLayer;
class VectorTileLayer;
class TileCreator;
class ViewportParams;
class PopupLayer;
class StyleBuilder;

/**
 * @short A widget class that displays a view of the earth.
 *
 * This widget displays a view of the earth or any other globe,
 * depending on which dataset is used. The user can navigate the
 * globe using either a control widget, e.g. the mouse.
 * The mouse and keyboard control is done through a
 * MarbleWidgetInputHandler. Only some aspects of the widget can be
 * controlled by the mouse and/or keyboard.
 *
 * By clicking on the globe and moving the mouse, the position can be
 * changed. The user can also zoom by using the scroll wheel of the
 * mouse in the widget. The zoom value is not tied to any units, but
 * is an abstract value without any physical meaning. A value around
 * 1000 shows the full globe in a normal-sized window. Higher zoom
 * values give a more zoomed-in view.
 *
 * The MarbleWidget owns a data model to work. This model is contained
 * in the MarbleModel class, and it is painted by using a MarbleMap.
 * The widget takes care of creating the map and model. A MarbleModel
 * contains several datatypes, among them <b>tiles</b> which provide the
 * background, <b>vectors</b> which provide things like country
 * borders and coastlines and <b>placemarks</b> which can show points
 * of interest, such as cities, mountain tops or the poles.
 *
 * In addition to navigating with the mouse, you can also use it to
 * get information about items on the map. You can either click on a
 * placemark with the left mouse button or with the right mouse button
 * anywhere on the map.
 *
 * The left mouse button opens up a menu with all the placemarks
 * within a certain distance from the mouse pointer. When you choose
 * one item from the menu, Marble will open up a dialog window with
 * some information about the placemark and also try to connect to
 * Wikipedia to retrieve an article about it. If there is such an
 * article, you will get a mini-browser window with the article in a tab.
 *
 * @see MarbleMap
 * @see MarbleModel
 */

class DIGIKAM_EXPORT MarbleWidget : public QWidget
{
    Q_OBJECT

    Q_PROPERTY(int zoom             READ zoom            WRITE setZoom)

    Q_PROPERTY(QString mapThemeId   READ mapThemeId      WRITE setMapThemeId)
    Q_PROPERTY(int projection       READ projection      WRITE setProjection)

    Q_PROPERTY(qreal longitude      READ centerLongitude WRITE setCenterLongitude)
    Q_PROPERTY(qreal latitude       READ centerLatitude  WRITE setCenterLatitude)

    Q_PROPERTY(bool showOverviewMap READ showOverviewMap WRITE setShowOverviewMap)
    Q_PROPERTY(bool showScaleBar    READ showScaleBar    WRITE setShowScaleBar)
    Q_PROPERTY(bool showCompass     READ showCompass     WRITE setShowCompass)
    Q_PROPERTY(bool showGrid        READ showGrid        WRITE setShowGrid)

    Q_PROPERTY(bool showClouds      READ showClouds      WRITE setShowClouds)
    Q_PROPERTY(bool showSunShading  READ showSunShading  WRITE setShowSunShading)
    Q_PROPERTY(bool showCityLights  READ showCityLights  WRITE setShowCityLights)

    Q_PROPERTY(bool isLockedToSubSolarPoint    READ isLockedToSubSolarPoint    WRITE setLockToSubSolarPoint)
    Q_PROPERTY(bool isSubSolarPointIconVisible READ isSubSolarPointIconVisible WRITE setSubSolarPointIconVisible)

    Q_PROPERTY(bool showAtmosphere  READ showAtmosphere  WRITE setShowAtmosphere)
    Q_PROPERTY(bool showCrosshairs  READ showCrosshairs  WRITE setShowCrosshairs)

    Q_PROPERTY(bool showPlaces      READ showPlaces      WRITE setShowPlaces)
    Q_PROPERTY(bool showCities      READ showCities      WRITE setShowCities)
    Q_PROPERTY(bool showTerrain     READ showTerrain     WRITE setShowTerrain)
    Q_PROPERTY(bool showOtherPlaces READ showOtherPlaces WRITE setShowOtherPlaces)

    Q_PROPERTY(bool showRelief      READ showRelief      WRITE setShowRelief)

    Q_PROPERTY(bool showIceLayer    READ showIceLayer    WRITE setShowIceLayer)
    Q_PROPERTY(bool showBorders     READ showBorders     WRITE setShowBorders)
    Q_PROPERTY(bool showRivers      READ showRivers      WRITE setShowRivers)
    Q_PROPERTY(bool showLakes       READ showLakes       WRITE setShowLakes)

    Q_PROPERTY(ViewContext viewContext   READ viewContext WRITE setViewContext NOTIFY viewContextChanged)

    Q_PROPERTY(RenderStatus renderStatus READ renderStatus NOTIFY renderStatusChanged)

    Q_PROPERTY(quint64 volatileTileCacheLimit READ volatileTileCacheLimit WRITE setVolatileTileCacheLimit)

public:

    /**
     * @brief Construct a new MarbleWidget.
     * @param parent the parent widget
     *
     * This constructor should be used when you will only use one
     * MarbleWidget. The widget will create its own MarbleModel when created.
     */
    explicit MarbleWidget(QWidget* parent = nullptr);

    ~MarbleWidget() override;

    /// @name Access to helper objects
    //@{

    /**
     * @brief Return the model that this view shows.
     */
    MarbleModel* model();
    const MarbleModel* model() const;

    ViewportParams* viewport();
    const ViewportParams* viewport() const;

    MarbleWidgetPopupMenu* popupMenu();

    /**
     * Returns the current input handler
     */
    MarbleWidgetInputHandler* inputHandler() const;

    /**
     * @brief Set the input handler
     */
    void setInputHandler(MarbleWidgetInputHandler* handler);

    /**
     * @brief Returns a list of all RenderPlugins on the widget, this includes float items
     * @return the list of RenderPlugins
     */
    QList<RenderPlugin*> renderPlugins() const;

    /**
     * @brief Returns a list of all ParseRunnerPlugins loaded internally.
     * @return the list of ParseRunnerPlugins
     */
    QList<const ParseRunnerPlugin*> runnerPlugins() const;

    /**
     * @brief Returns a list of all FloatItems on the widget
     * @return the list of the floatItems
     */
    QList<AbstractFloatItem*> floatItems() const;

    /**
     * @brief Returns the FloatItem with the given id
     * @return The pointer to the requested floatItem,
     *
     * If no item is found the null pointer is returned.
     */
    AbstractFloatItem* floatItem(const QString& nameId) const;

    /**
     * Reads the plugin settings.
     */
    void readPluginSettings();

    /**
     * Writes the plugin settings.
     */
    void writePluginSettings() const;

    /**
     * @brief Retrieve the view context (i.e. still or animated map)
     */
    ViewContext viewContext() const;

    /**
     * @brief Get the GeoSceneDocument object of the current map theme
     */
    GeoSceneDocument* mapTheme() const;

    /**
     * @brief Returns all widgets of dataPlugins on the position curpos
     */
    QList<AbstractDataPluginItem*> whichItemAt(const QPoint& curpos) const;

    /**
     * @brief Add a layer to be included in rendering.
     */
    void addLayer(LayerInterface* layer);

    /**
     * @brief Remove a layer from being included in rendering.
     */
    void removeLayer(LayerInterface* layer);

    PopupLayer* popupLayer();

    const StyleBuilder* styleBuilder() const;

    /**
     * @brief  Get the Projection used for the map
     * @return @c Spherical         a Globe
     * @return @c Equirectangular   a flat map
     * @return @c Mercator          another flat map
     */
    Projection projection() const;

    //@}

    /// @name Visible map area
    //@{

    /**
     * @brief Get the ID of the current map theme
     * To ensure that a unique identifier is being used the theme does NOT
     * get represented by its name but the by relative location of the file
     * that specifies the theme:
     *
     * Example:
     *
     *    mapThemeId = "earth/bluemarble/bluemarble.dgml"
     */
    QString mapThemeId() const;

    /**
     * @brief Return the projected region which describes the (shape of the) projected surface.
     */
    QRegion mapRegion() const;

    /**
     * @brief Return the radius of the globe in pixels.
     */
    int radius() const;

    /**
     * @brief Return the current zoom amount.
     */
    int zoom() const;

    int tileZoomLevel() const;

    /**
     * @brief Return the current distance.
     */
    qreal distance() const;

    /**
     * @brief Return the current distance string.
     */
    QString distanceString() const;

    /**
     * @brief Return the minimum zoom value for the current map theme.
     */
    int minimumZoom() const;

    /**
     * @brief Return the minimum zoom value for the current map theme.
     */
    int maximumZoom() const;

    //@}

    /// @name Position management
    //@{

    /**
     * @brief Get the screen coordinates corresponding to geographical coordinates in the widget.
     * @param lon    the lon coordinate of the requested pixel position
     * @param lat    the lat coordinate of the requested pixel position
     * @param x      the x coordinate of the pixel is returned through this parameter
     * @param y      the y coordinate of the pixel is returned through this parameter
     * @return @c true  if the geographical coordinates are visible on the screen
     *         @c false if the geographical coordinates are not visible on the screen
     */
    bool screenCoordinates(qreal lon, qreal lat,
                           qreal& x, qreal& y) const;

    /**
     * @brief Get the earth coordinates corresponding to a pixel in the widget.
     * @param x      the x coordinate of the pixel
     * @param y      the y coordinate of the pixel
     * @param lon    the longitude angle is returned through this parameter
     * @param lat    the latitude angle is returned through this parameter
     * @param unit   the angle unit
     * @return @c true  if the pixel (x, y) is within the globe
     *         @c false if the pixel (x, y) is outside the globe, i.e. in space.
     */
    bool geoCoordinates(int x, int y,
                        qreal& lon, qreal& lat,
                        GeoDataCoordinates::Unit = GeoDataCoordinates::Degree) const;

    /**
     * @brief Return the longitude of the center point.
     * @return The longitude of the center point in degree.
     */
    qreal centerLongitude() const;

    /**
     * @brief Return the latitude of the center point.
     * @return The latitude of the center point in degree.
     */
    qreal centerLatitude() const;

    qreal heading() const;

    /**
     * @brief Return how much the map will move if one of the move slots are called.
     * @return The move step.
     */
    qreal moveStep() const;

    /**
    * @brief Return the lookAt
    */
    GeoDataLookAt lookAt() const;

    /**
     * @return The current point of focus, e.g. the point that is not moved
     * when changing the zoom level. If not set, it defaults to the
     * center point.
     * @see centerLongitude centerLatitude setFocusPoint resetFocusPoint
     */
    GeoDataCoordinates focusPoint() const;

    /**
     * @brief Change the point of focus, overriding any previously set focus point.
     * @param focusPoint New focus point
     * @see focusPoint resetFocusPoint
     */
    void setFocusPoint(const GeoDataCoordinates& focusPoint);

    /**
     * @brief Invalidate any focus point set with @ref setFocusPoint.
     * @see focusPoint setFocusPoint
     */
    void resetFocusPoint();

    /**
      * @brief Return the globe radius (pixel) for the given distance (km)
      */
    qreal radiusFromDistance(qreal distance) const;

    /**
      * @brief Return the distance (km) at the given globe radius (pixel)
      */
    qreal distanceFromRadius(qreal radius) const;

    /**
      * Returns the zoom value (no unit) corresponding to the given camera distance (km)
      */
    qreal zoomFromDistance(qreal distance) const;

    /**
      * Returns the distance (km) corresponding to the given zoom value
      */
    qreal distanceFromZoom(qreal zoom) const;

    //@}

    /// @name Placemark management
    //@{

    QVector<const GeoDataFeature*> whichFeatureAt(const QPoint&) const;

    //@}

    /// @name Float items and map appearance
    //@{

    /**
     * @brief Return whether the overview map is visible.
     * @return The overview map visibility.
     */
    bool showOverviewMap() const;

    /**
     * @brief Return whether the scale bar is visible.
     * @return The scale bar visibility.
     */
    bool showScaleBar() const;

    /**
     * @brief Return whether the compass bar is visible.
     * @return The compass visibility.
     */
    bool showCompass() const;

    /**
     * @brief Return whether the cloud cover is visible.
     * @return The cloud cover visibility.
     */
    bool showClouds() const;

    /**
     * @brief Return whether the night shadow is visible.
     * @return visibility of night shadow
     */
    bool showSunShading() const;

    /**
     * @brief Return whether the city lights are shown instead of the night shadow.
     * @return visibility of city lights
     */
    bool showCityLights() const;

    /**
     * @brief Return whether the globe is locked to the sub solar point
     * @return if globe is locked to sub solar point
     */
    bool isLockedToSubSolarPoint() const;

    /**
     * @brief Return whether the sun icon is shown in the sub solar point.
     * @return visibility of the sun icon in the sub solar point
     */
    bool isSubSolarPointIconVisible() const;

    /**
     * @brief Return whether the atmospheric glow is visible.
     * @return The cloud cover visibility.
     */
    bool showAtmosphere() const;

    /**
     * @brief Return whether the crosshairs are visible.
     * @return The crosshairs' visibility.
     */
    bool showCrosshairs() const;

    /**
     * @brief Return whether the coordinate grid is visible.
     * @return The coordinate grid visibility.
     */
    bool showGrid() const;

    /**
     * @brief Return whether the place marks are visible.
     * @return The place mark visibility.
     */
    bool showPlaces() const;

    /**
     * @brief Return whether the city place marks are visible.
     * @return The city place mark visibility.
     */
    bool showCities() const;

    /**
     * @brief Return whether the terrain place marks are visible.
     * @return The terrain place mark visibility.
     */
    bool showTerrain() const;

    /**
     * @brief Return whether other places are visible.
     * @return The visibility of other places.
     */
    bool showOtherPlaces() const;

    /**
     * @brief Return whether the relief is visible.
     * @return The relief visibility.
     */
    bool showRelief() const;

    /**
     * @brief Return whether the ice layer is visible.
     * @return The ice layer visibility.
     */
    bool showIceLayer() const;

    /**
     * @brief Return whether the borders are visible.
     * @return The border visibility.
     */
    bool showBorders() const;

    /**
     * @brief Return whether the rivers are visible.
     * @return The rivers' visibility.
     */
    bool showRivers() const;

    /**
     * @brief Return whether the lakes are visible.
     * @return The lakes' visibility.
     */
    bool showLakes() const;

    /**
     * @brief Return whether the frame rate gets displayed.
     * @return the frame rates visibility
     */
    bool showFrameRate() const;

    bool showBackground() const;

    /**
     * @brief Retrieve the map quality depending on the view context
     */
    MapQuality mapQuality(ViewContext = Still) const;

    /**
     * @brief Retrieve whether travels to a point should get animated
     */
    bool animationsEnabled() const;

    AngleUnit defaultAngleUnit() const;
    void setDefaultAngleUnit(AngleUnit angleUnit);

    QFont defaultFont() const;
    void setDefaultFont(const QFont& font);

    //@}

    /// @name Tile management
    //@{

    /**
     * @brief Returns the limit in kilobytes of the volatile (in RAM) tile cache.
     * @return the limit of volatile tile cache
     */
    quint64 volatileTileCacheLimit() const;

    //@}

    /// @name Miscellaneous
    //@{

    /**
     * @brief Return a QPixmap with the current contents of the widget.
     */
    QPixmap mapScreenShot();

    //@}

    /// @todo Enable this instead of the zoomView slot below for proper deprecation warnings
    /// around Marble 1.8
    /// @deprecated Please use setZoom
    //( void zoomView( int zoom, FlyToMode mode = Instant ) );

    /**
     * Summarized render status of the current map view
     * @see renderState
     */
    RenderStatus renderStatus() const;

    /**
     * Detailed render status of the current map view
     */
    RenderState renderState() const;

    /**
     * Toggle whether regions are highlighted when user selects them
     */
    void setHighlightEnabled(bool enabled);

public Q_SLOTS:

    /// @name Position management slots
    //@{

    /**
     * @brief Set the radius of the globe in pixels.
     * @param radius The new globe radius value in pixels.
     */
    void setRadius(int radius);

    /**
     * @brief Zoom the view to a certain zoomlevel
     * @param zoom the new zoom level.
     * @param mode the FlyToMode that will be used.
     *
     * The zoom level is an abstract value without physical
     * interpretation. A zoom value around 1000 lets the viewer see
     * all of the earth in the default window.
     */
    void setZoom(int zoom, FlyToMode mode = Instant);

    /**
     * @deprecated To be removed soon. Please use setZoom instead. Same parameters.
     */
    void zoomView(int zoom, FlyToMode mode = Instant);

    /**
     * @brief Zoom the view by a certain step
     * @param zoomStep  the difference between the old zoom and the new
     * @param mode the FlyToMode that will be used.
     */
    void zoomViewBy(int zoomStep, FlyToMode mode = Instant);

    /**
    * @brief Zoom in by the amount zoomStep.
    */
    void zoomIn(FlyToMode mode = Automatic);
    /**
     * @brief Zoom out by the amount zoomStep.
     */
    void zoomOut(FlyToMode mode = Automatic);

    /**
     * @brief Set the distance of the observer to the globe in km.
     * @param distance The new distance in km.
     */
    void setDistance(qreal distance);

    /**
     * @brief Rotate the view by the two angles phi and theta.
     * @param deltaLon an angle that specifies the change in terms of longitude
     * @param deltaLat an angle that specifies the change in terms of latitude
     * @param mode the FlyToMode that will be used
     *
     * This function rotates the view by two angles,
     * deltaLon ("theta") and deltaLat ("phi").
     * If we start at (0, 0), the result will be the exact equivalent
     * of (lon, lat), otherwise the resulting angle will be the sum of
     * the previous position and the two offsets.
     */
    void rotateBy(const qreal deltaLon, const qreal deltaLat, FlyToMode mode = Instant);

    /**
     * @brief Center the view on a geographical point
     * @param lat an angle in degrees parallel to the latitude lines
     *             +90(N) - -90(S)
     * @param lon an angle in degrees parallel to the longitude lines
     *             +180(W) - -180(E)
     * @param animated whether to use animation
     */
    void centerOn(const qreal lon, const qreal lat, bool animated = false);

    /**
     * @brief Center the view on a point
     * This method centers the Marble map on the point described by the latitude
     * and longitude in the GeoDataCoordinate parameter @c point. It also zooms
     * the map to be at the elevation described by the altitude. If this is
     * not the desired functionality or you do not have an accurate altitude
     * then use @see centerOn(qreal, qreal, bool)
     * @param point the point in 3 dimensions above the globe to move the view
     *              to. It will always be looking vertically down.
     * @param animated whether to use animation
     */
    void centerOn(const GeoDataCoordinates& point, bool animated = false);

    /**
     * @brief Center the view on a bounding box so that it completely fills the viewport
     * This method not only centers on the center of the GeoDataLatLon box but it also
     * adjusts the zoom of the marble widget so that the LatLon box provided fills
     * the viewport.
     * @param box The GeoDataLatLonBox to zoom and move the MarbleWidget to.
     * @param animated whether to use animation.
     */
    void centerOn(const GeoDataLatLonBox& box, bool animated = false);

    /**
     * @brief Center the view on a placemark according to the following logic:
     * - if the placemark has a lookAt, zoom and center on that lookAt
     * - otherwise use the placemark geometry's latLonAltBox
     * @param placemark The GeoDataPlacemark to zoom and move the MarbleWidget to.
     * @param animated Whether the centering is animated.
     */
    void centerOn(const GeoDataPlacemark& placemark, bool animated = false);

    /**
     * @brief Set the latitude for the center point
     * @param lat  the new value for the latitude in degree.
     * @param mode the FlyToMode that will be used.
     */
    void setCenterLatitude(qreal lat, FlyToMode mode = Instant);

    /**
     * @brief Set the longitude for the center point
     * @param lon  the new value for the longitude in degree.
     * @param mode the FlyToMode that will be used.
     */
    void setCenterLongitude(qreal lon, FlyToMode mode = Instant);

    void setHeading(qreal heading);

    /**
     * @brief Move left by the moveStep.
     */
    void moveLeft(FlyToMode mode = Automatic);

    /**
     * @brief Move right by the moveStep.
     */
    void moveRight(FlyToMode mode = Automatic);

    /**
     * @brief Move up by the moveStep.
     */
    void moveUp(FlyToMode mode = Automatic);

    /**
     * @brief Move down by the moveStep.
     */
    void moveDown(FlyToMode mode = Automatic);

    /**
     * @brief Center the view on the default start point with the default zoom.
     */
    void goHome(FlyToMode mode = Automatic);

    /**
      * @brief Change the camera position to the given position.
      * @param lookAt New camera position. Changing the camera position means
      * that both the current center position as well as the zoom value may change
      * @param mode Interpolation type for intermediate camera positions. Automatic
      * (default) chooses a suitable interpolation among Instant, Lenar and Jump.
      * Instant will directly set the new zoom and position values, while
      * Linear results in a linear interpolation of intermediate center coordinates
      * along the sphere and a linear interpolation of changes in the camera distance
      * to the ground. Finally, Jump will behave the same as Linear with regard to
      * the center position interpolation, but use a parabolic height increase
      * towards the middle point of the intermediate positions. This appears
      * like a jump of the camera.
      */
    void flyTo(const GeoDataLookAt& lookAt, FlyToMode mode = Automatic);

    //@}

    /// @name Float items and map appearance slots
    //@{

    /**
     * @brief Set the Projection used for the map
     * @param projection projection type (e.g. Spherical, Equirectangular, Mercator)
     */
    void setProjection(int        projection);
    void setProjection(Projection projection);

    /**
     * @brief Set a new map theme
     * @param maptheme  The ID of the new maptheme. To ensure that a unique
     * identifier is being used the theme does NOT get represented by its
     * name but the by relative location of the file that specifies the theme:
     *
     * Example:
     *
     *    maptheme = "earth/bluemarble/bluemarble.dgml"
     */
    void setMapThemeId(const QString& maptheme);

    /**
     * @brief Sets the value of a map theme property
     * @param name name of the property
     * @param value value of the property (usually: visibility)
     *
     * Later on we might add a setPropertyType and a QVariant
     * if needed.
     */
    void setPropertyValue(const QString& name, bool value);

    /**
     * @brief Set whether the overview map overlay is visible
     * @param visible visibility of the overview map
     */
    void setShowOverviewMap(bool visible);

    /**
     * @brief Set whether the scale bar overlay is visible
     * @param visible visibility of the scale bar
     */
    void setShowScaleBar(bool visible);

    /**
     * @brief Set whether the compass overlay is visible
     * @param visible visibility of the compass
     */
    void setShowCompass(bool visible);

    /**
     * @brief Set whether the cloud cover is visible
     * @param visible visibility of the cloud cover
     */
    void setShowClouds(bool visible);

    /**
     * @brief Set whether the night shadow is visible.
     * @param visible visibility of shadow
     */
    void setShowSunShading(bool visible);

    /**
     * @brief Set whether city lights instead of night shadow are visible.
     * @param visible visibility of city lights
     */
    void setShowCityLights(bool visible);

    /**
     * @brief Set the globe locked to the sub solar point
     * @param visible if globe is locked to the sub solar point
     */
    void setLockToSubSolarPoint(bool visible);

    /**
     * @brief Set whether the sun icon is shown in the sub solar point
     * @param visible if the sun icon is shown in the sub solar point
     */
    void setSubSolarPointIconVisible(bool visible);

    /**
     * @brief Set whether the atmospheric glow is visible
     * @param visible visibility of the atmospheric glow
     */
    void setShowAtmosphere(bool visible);

    /**
     * @brief Set whether the crosshairs are visible
     * @param visible visibility of the crosshairs
     */
    void setShowCrosshairs(bool visible);

    /**
     * @brief Set whether the coordinate grid overlay is visible
     * @param visible visibility of the coordinate grid
     */
    void setShowGrid(bool visible);

    /**
     * @brief Set whether the place mark overlay is visible
     * @param visible visibility of the place marks
     */
    void setShowPlaces(bool visible);

    /**
     * @brief Set whether the city place mark overlay is visible
     * @param visible visibility of the city place marks
     */
    void setShowCities(bool visible);

    /**
     * @brief Set whether the terrain place mark overlay is visible
     * @param visible visibility of the terrain place marks
     */
    void setShowTerrain(bool visible);

    /**
     * @brief Set whether the other places overlay is visible
     * @param visible visibility of other places
     */
    void setShowOtherPlaces(bool visible);

    /**
     * @brief Set whether the relief is visible
     * @param visible visibility of the relief
     */
    void setShowRelief(bool visible);

    /**
     * @brief Set whether the ice layer is visible
     * @param visible visibility of the ice layer
     */
    void setShowIceLayer(bool visible);

    /**
     * @brief Set whether the borders visible
     * @param visible visibility of the borders
     */
    void setShowBorders(bool visible);

    /**
     * @brief Set whether the rivers are visible
     * @param visible visibility of the rivers
     */
    void setShowRivers(bool visible);

    /**
     * @brief Set whether the lakes are visible
     * @param visible visibility of the lakes
     */
    void setShowLakes(bool visible);

    /**
     * @brief Set whether the frame rate gets shown
     * @param visible visibility of the frame rate
     */
    void setShowFrameRate(bool visible);

    void setShowBackground(bool visible);

    /**
     * @brief Set whether the is tile is visible
     * @note This is part of the transitional debug API
     *       and might be subject to changes until Marble 0.8
     * @param visible visibility of the tile
     */
    void setShowTileId(bool visible);

    /**
     * @brief Set whether the runtime tracing for layers gets shown
     * @param visible visibility of the runtime tracing
     */
    void setShowRuntimeTrace(bool visible);

    bool showRuntimeTrace() const;

    /**
     * @brief Set whether to enter the debug mode for
     * polygon node drawing
     * @param visible visibility of the node debug mode
     */
    void setShowDebugPolygons(bool visible);

    bool showDebugPolygons() const;

    /**
     * @brief Set whether to enter the debug mode for
     * batch rendering
     * @param visible visibility of the batch rendering
     */
    void setShowDebugBatchRender(bool visible);

    bool showDebugBatchRender() const;

    /**
     * @brief Set whether to enter the debug mode for
     * placemark drawing
     * @param visible visibility of the node debug mode
     */
    void setShowDebugPlacemarks(bool visible);

    bool showDebugPlacemarks() const;

    /**
     * @brief Set whether to render according to OSM indoor level tags
     * @param visible visibility of entities (placemarks, buildings etc.) level-wise
     */
    void setDebugLevelTags(bool visible);

    bool debugLevelTags() const;

    /**
     * @brief Set the level to debug
     * @param level the level to debug
     */
    void setLevelToDebug(int level);

    int levelToDebug() const;

    /**
    * @brief Set the map quality for the specified view context.
    *
    * @param quality map quality for the specified view context
    * @param viewContext view context whose map quality should be set
    */
    void setMapQualityForViewContext(MapQuality quality, ViewContext viewContext);

    /**
     * @brief Set the view context (i.e. still or animated map)
     */
    void setViewContext(ViewContext viewContext);

    /**
     * @brief Set whether travels to a point should get animated
     */
    void setAnimationsEnabled(bool enabled);

    //@}

    /// @name Tile management slots
    //@{

    void clearVolatileTileCache();

    /**
     * @brief Set the limit of the volatile (in RAM) tile cache.
     * @param kiloBytes The limit in kilobytes.
     */
    void setVolatileTileCacheLimit(quint64 kiloBytes);

    /**
     * @brief A slot that is called when the model starts to create new tiles.
     * @param creator the tile creator object.
     * @param name  the name of the created theme.
     * @param description  a descriptive text that can be shown in a dialog.
     * @see creatingTilesProgress
     *
     * This function is connected to the models signal with the same
     * name.  When the model needs to create a cache of tiles in
     * several different resolutions, it will Q_EMIT creatingTilesStart
     * once with a name of the theme and a descriptive text.  The
     * widget can then pop up a dialog to explain why there is a
     * delay. The model will then call creatingTilesProgress several
     * times until the parameter reaches 100 (100%), after which the
     * creation process is finished.  After this there will be no more
     * calls to creatingTilesProgress, and the poup dialog can then be
     * closed.
     */
    void creatingTilesStart(TileCreator* creator, const QString& name, const QString& description);

    /**
     * @brief Re-download all visible tiles.
     */
    void reloadMap();

    void downloadRegion(QVector<TileCoordsPyramid> const&);

    //@}

    /// @name Miscellaneous slots
    //@{

    /**
     * @brief Used to notify about the position of the mouse click
      */
    void notifyMouseClick(int x, int y);

    void setSelection(const QRect& region);

    void setInputEnabled(bool);

    TextureLayer* textureLayer() const;

    VectorTileLayer* vectorTileLayer() const;

    //@}

Q_SIGNALS:

    /**
     * @brief Signal that the zoom has changed, and to what.
     * @param zoom  The new zoom value.
     * @see setZoom()
     */
    void zoomChanged(int zoom);
    void distanceChanged(const QString& distanceString);

    void tileLevelChanged(int level);

    void viewContextChanged(ViewContext newViewContext);

    /**
     * @brief Signal that the theme has changed
     * @param theme  Name of the new theme.
     */
    void themeChanged(const QString& theme);

    void projectionChanged(Projection);

    void mouseMoveGeoPosition(const QString&);

    void mouseClickGeoPosition(qreal lon, qreal lat, GeoDataCoordinates::Unit);

    void framesPerSecond(qreal fps);

    /**
     * This signal is emitted when a new rectangle region is selected over the map.
     *
     * @param boundingBox The geographical coordinates of the selected region
     */
    void regionSelected(const GeoDataLatLonBox& boundingBox);

    /**
     * This signal is emitted when the settings of a plugin changed.
     */
    void pluginSettingsChanged();

    /**
     * @brief Signal that a render item has been initialized
     */
    void renderPluginInitialized(RenderPlugin* renderPlugin);

    /**
     * This signal is emitted when the visible region of the map changes. This typically happens
     * when the user moves the map around or zooms.
     */
    void visibleLatLonAltBoxChanged(const GeoDataLatLonAltBox& visibleLatLonAltBox);

    /**
     * @brief Emitted when the layer rendering status has changed
     * @param status New render status
     */
    void renderStatusChanged(RenderStatus status);

    void renderStateChanged(const RenderState& state);

    void highlightedPlacemarksChanged(qreal lon, qreal lat, GeoDataCoordinates::Unit unit);

    void propertyValueChanged(const QString& name, bool value);

protected:

    /**
     * @brief Reimplementation of the leaveEvent() function in QWidget.
     */
    void leaveEvent(QEvent* event) override;

    /**
     * @brief Reimplementation of the paintEvent() function in QWidget.
     */
    void paintEvent(QPaintEvent* event) override;

    /**
     * @brief Reimplementation of the resizeEvent() function in QWidget.
     */
    void resizeEvent(QResizeEvent* event) override;

    void connectNotify(const QMetaMethod& signal) override;
    void disconnectNotify(const QMetaMethod& signal) override;

    /**
      * @brief Reimplementation of the changeEvent() function in QWidget to
      * react to changes of the enabled state
      */
    void changeEvent(QEvent* event) override;

    /**
     * @brief Enables custom drawing onto the MarbleWidget straight after
     * @brief the globe and before all other layers has been rendered.
     * @param painter
     *
     * @deprecated implement LayerInterface and add it using @p addLayer()
     */
    virtual void customPaint(GeoPainter* painter);

private:

    Q_PRIVATE_SLOT(d, void updateMapTheme())
    Q_PRIVATE_SLOT(d, void updateSystemBackgroundAttribute())

private:

    Q_DISABLE_COPY(MarbleWidget)

private:

    MarbleWidgetPrivate* const d = nullptr;
    friend class MarbleWidgetPrivate;

    class CustomPaintLayer;
    friend class CustomPaintLayer;

    friend class MarbleWidgetDefaultInputHandler;
};

} // Namespace Marble
