// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef SEEN_SP_DESKTOP_H
#define SEEN_SP_DESKTOP_H

/*
 * Author:
 *   Lauris Kaplinski <lauris@kaplinski.com>
 *   Frank Felfe <innerspace@iname.com>
 *   bulia byak <buliabyak@users.sf.net>
 *   Ralf Stephan <ralf@ark.in-berlin.de>
 *   John Bintz <jcoswell@coswellproductions.org>
 *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
 *   Jon A. Cruz <jon@joncruz.org>get
 *   Abhishek Sharma
 *
 * Copyright (C) 2007 Johan Engelen
 * Copyright (C) 2006 John Bintz
 * Copyright (C) 1999-2005 authors
 * Copyright (C) 2000-2001 Ximian, Inc.
 *
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 *
 */

#include <cstddef>
#include <sigc++/sigc++.h>
#include <glibmm/ustring.h>

#include <2geom/affine.h>
#include <2geom/transforms.h>
#include <2geom/rect.h>

#include "preferences.h"

#include "display/rendermode.h"

#include "object/sp-gradient.h" // TODO refactor enums out to their own .h file

#include "ui/dialog/print.h"
#include "ui/view/view.h"

class SPCSSAttr;
struct SPCanvas;
struct SPCanvasItem;
struct SPCanvasGroup;
struct DesktopPrefObserver;

namespace Inkscape {
namespace UI {
namespace Tools {

class ToolBase;

}
}
}

class SPItem;
class SPNamedView;
class SPObject;
class SPStyle;
typedef struct _DocumentInterface DocumentInterface;//struct DocumentInterface;

class InkscapeWindow;

namespace Gtk
{
    class Toolbar;
    class Window;
}

typedef int sp_verb_t;

struct _GdkEventAny;
typedef struct _GdkEventAny GdkEventAny;
struct _GdkEventWindowState;
typedef struct _GdkEventWindowState GdkEventWindowState;

struct InkscapeApplication;

namespace Inkscape {
  class LayerModel;
  class MessageContext;
  class Selection;
  class LayerManager;
  class EventLog;
  namespace UI {
      namespace Dialog {
          class DialogManager;
      }

      namespace Widget {
	      class Dock;
      }

      namespace View {
	      struct EditWidgetInterface;
      }
  }
  namespace Whiteboard {
      class SessionManager;
  }
  namespace Display {
      class TemporaryItemList;
      class TemporaryItem;
      class SnapIndicator;
  }
}

#define SP_DESKTOP_ZOOM_MAX 256.0
#define SP_DESKTOP_ZOOM_MIN 0.01

/**
 * SPDesktop is a subclass of View, implementing an editable document
 * canvas.  It is extensively used by many UI controls that need certain
 * visual representations of their own.
 *
 * SPDesktop provides a certain set of SPCanvasItems, serving as GUI
 * layers of different control objects. The one containing the whole
 * document is the drawing layer. In addition to it, there are grid,
 * guide, sketch and control layers. The sketch layer is used for
 * temporary drawing objects, before the real objects in document are
 * created. The control layer contains editing knots, rubberband and
 * similar non-document UI objects.
 *
 * Each SPDesktop is associated with a SPNamedView node of the document
 * tree.  Currently, all desktops are created from a single main named
 * view, but in the future there may be support for different ones.
 * SPNamedView serves as an in-document container for desktop-related
 * data, like grid and guideline placement, snapping options and so on.
 *
 * Associated with each SPDesktop are the two most important editing
 * related objects - SPSelection and ToolBase.
 *
 * Sodipodi keeps track of the active desktop and invokes notification
 * signals whenever it changes. UI elements can use these to update their
 * display to the selection of the currently active editing window.
 * (Lauris Kaplinski)
 *
 * @see \ref desktop-handles.h for desktop macros.
 */
class SPDesktop : public Inkscape::UI::View::View
{
public:
    Inkscape::UI::Dialog::DialogManager *_dlg_mgr;
    SPNamedView               *namedview;
    SPCanvas                  *canvas;
    Inkscape::LayerModel      *layers;
    /// current selection; will never generally be NULL
    Inkscape::Selection       *selection;
    Inkscape::UI::Tools::ToolBase            *event_context;
    Inkscape::LayerManager    *layer_manager;
    Inkscape::EventLog        *event_log;
    DocumentInterface *dbus_document_interface;
    Inkscape::Display::TemporaryItemList *temporary_item_list;
    Inkscape::Display::SnapIndicator *snapindicator;
    /// Stored settings for print dialogue
    Inkscape::UI::Dialog::PrinterSettings printer_settings;

    Inkscape::UI::Tools::ToolBase* getEventContext() const;
    Inkscape::Selection* getSelection() const;
    SPDocument* getDocument() const;
    SPCanvas* getCanvas() const;
    SPCanvasItem* getAcetate() const;
    SPCanvasGroup* getMain() const;
    SPCanvasGroup* getGridGroup() const;
    SPCanvasGroup* getGuides() const;
    SPCanvasItem* getDrawing() const;
    SPCanvasGroup* getSketch() const;
    SPCanvasGroup* getControls() const;
    SPCanvasGroup* getTempGroup() const;
    Inkscape::MessageStack* getMessageStack() const;
    SPNamedView* getNamedView() const;

    SPCanvasItem  *acetate;
    SPCanvasGroup *main;
    SPCanvasGroup *gridgroup;
    SPCanvasGroup *guides;
    SPCanvasItem  *drawing;
    SPCanvasGroup *sketch;
    SPCanvasGroup *controls;
    SPCanvasGroup *tempgroup;   ///< contains temporary canvas items
    SPCanvasItem  *page;        ///< page background
    SPCanvasItem  *page_border; ///< page border
    SPCanvasItem  *canvas_rotate; ///< quickly show canvas rotation
    SPCanvasItem  *canvas_debug;  ///< shows tiling
    SPCSSAttr     *current;     ///< current style
    bool           _focusMode;  ///< Whether we're focused working or general working

    unsigned int dkey;
    unsigned int number;
    guint window_state;
    unsigned int interaction_disabled_counter;
    bool waiting_cursor;
    bool showing_dialogs;
    bool rotation_locked;
    /// \todo fixme: This has to be implemented in different way */
    guint guides_active : 1;

    // storage for selected dragger used by GrDrag as it's
    // created and deleted by tools
    SPItem *gr_item;
    GrPointType  gr_point_type;
    guint  gr_point_i;
    Inkscape::PaintTarget gr_fill_or_stroke;

    Glib::ustring _reconstruction_old_layer_id;

    sigc::signal<void, sp_verb_t>      _tool_changed;
    sigc::signal<void, unsigned int, bool> _menu_update;
    sigc::signal<void, SPObject *>     _layer_changed_signal;
    sigc::signal<bool, const SPCSSAttr *>::accumulated<StopOnTrue> _set_style_signal;
    sigc::signal<int, SPStyle *, int>::accumulated<StopOnNonZero> _query_style_signal;
    
    /// Emitted when the zoom factor changes (not emitted when scrolling).
    /// The parameter is the new zoom factor
    sigc::signal<void, double> signal_zoom_changed;

    sigc::connection connectDestroy(const sigc::slot<void, SPDesktop*> &slot)
    {
        return _destroy_signal.connect(slot);
    }

    sigc::connection connectDocumentReplaced (const sigc::slot<void,SPDesktop*,SPDocument*> & slot)
    {
        return _document_replaced_signal.connect (slot);
    }

    sigc::connection connectEventContextChanged (const sigc::slot<void,SPDesktop*,Inkscape::UI::Tools::ToolBase*> & slot)
    {
        return _event_context_changed_signal.connect (slot);
    }
    sigc::connection connectSetStyle (const sigc::slot<bool, const SPCSSAttr *> & slot)
    {
        return _set_style_signal.connect (slot);
    }
    sigc::connection connectQueryStyle (const sigc::slot<int, SPStyle *, int> & slot)
    {
        return _query_style_signal.connect (slot);
    }
     // subselection is some sort of selection which is specific to the tool, such as a handle in gradient tool, or a text selection
    sigc::connection connectToolSubselectionChanged(const sigc::slot<void, gpointer> & slot) {
        return _tool_subselection_changed.connect(slot);
    }
    void emitToolSubselectionChanged(gpointer data);
    sigc::connection connectCurrentLayerChanged(const sigc::slot<void, SPObject *> & slot) {
        return _layer_changed_signal.connect(slot);
    }

    /**
     * Return new desktop object.
     * \pre namedview != NULL.
     * \pre canvas != NULL.
     */
    SPDesktop();

    void init (SPNamedView* nv, SPCanvas* canvas, Inkscape::UI::View::EditWidgetInterface *widget);
    ~SPDesktop() override;
    void destroy();

    Inkscape::MessageContext *guidesMessageContext() const {
        return _guides_message_context.get();
    }

    Inkscape::Display::TemporaryItem * add_temporary_canvasitem (SPCanvasItem *item, guint lifetime, bool move_to_bottom = true);
    void remove_temporary_canvasitem (Inkscape::Display::TemporaryItem * tempitem);

    void redrawDesktop();

    void _setDisplayMode(Inkscape::RenderMode mode);
    bool setDisplayModeNormal()
    {
        _setDisplayMode(Inkscape::RENDERMODE_NORMAL);
        return true;
    }
    bool setDisplayModeNoFilters()
    {
        _setDisplayMode(Inkscape::RENDERMODE_NO_FILTERS);
        return true;
    }
    bool setDisplayModeOutline()
    {
        _setDisplayMode(Inkscape::RENDERMODE_OUTLINE);
        return true;
    }
    bool setDisplayModeVisibleHairlines()
    {
        _setDisplayMode(Inkscape::RENDERMODE_VISIBLE_HAIRLINES);
        return true;
    }
    bool displayModeToggle();
    Inkscape::RenderMode _display_mode;
    Inkscape::RenderMode getMode() const { return _display_mode; }

    void _setDisplayColorMode(Inkscape::ColorMode mode);
    bool setDisplayColorModeNormal()
    {
        _setDisplayColorMode(Inkscape::COLORMODE_NORMAL);
        return true;
    }
    bool setDisplayColorModeGrayscale()
    {
        _setDisplayColorMode(Inkscape::COLORMODE_GRAYSCALE);
        return true;
    }
//    void setDisplayColorModePrintColorsPreview() {
//        _setDisplayColorMode(Inkscape::COLORMODE_PRINT_COLORS_PREVIEW);
//    }
    bool displayColorModeToggle();
    Inkscape::ColorMode _display_color_mode;
    Inkscape::ColorMode getColorMode() const { return _display_color_mode; }

    Inkscape::UI::Widget::Dock* getDock();

    void set_active (bool new_active);

    // Could make all callers use this->layers instead of passing calls through?
    SPObject *currentRoot() const;
    SPObject *currentLayer() const;
    void setCurrentLayer(SPObject *object);
    void toggleLayerSolo(SPObject *object);
    void toggleHideAllLayers(bool hide);
    void toggleLockAllLayers(bool lock);
    void toggleLockOtherLayers(SPObject *object);
    bool isLayer(SPObject *object) const;

    bool isWithinViewport(SPItem *item) const;
    bool itemIsHidden(SPItem const *item) const;

    void activate_guides (bool activate);
    void change_document (SPDocument *document);


    void setEventContext(const std::string& toolName);

    void set_coordinate_status (Geom::Point p);
    SPItem *getItemFromListAtPointBottom(const std::vector<SPItem*> &list, Geom::Point const &p) const;
    SPItem *getItemAtPoint(Geom::Point const &p, bool into_groups, SPItem *upto = nullptr) const;
    SPItem *getGroupAtPoint(Geom::Point const &p) const;
    Geom::Point point(bool outside_canvas = false) const;

    void prev_transform();
    void next_transform();
    void clear_transform_history();
    
    void set_display_area (bool log = true);
    void set_display_area (Geom::Point const &c, Geom::Point const &w, bool log = true);
    void set_display_area (Geom::Rect const &a, Geom::Coord border, bool log = true);
    Geom::Rect get_display_area(bool use_integer_viewbox = false) const;

    void zoom_absolute_keep_point   (Geom::Point const &c, double const zoom);
    void zoom_relative_keep_point   (Geom::Point const &c, double const zoom);
    void zoom_absolute_center_point (Geom::Point const &c, double const zoom);
    void zoom_relative_center_point (Geom::Point const &c, double const zoom);

    void zoom_page();
    void zoom_page_width();
    void zoom_drawing();
    void zoom_selection();
    void zoom_center_page();

    double current_zoom() const { return _current_affine.getZoom(); }

    void zoom_quick(bool enable = true);
    /** \brief  Returns whether the desktop is in quick zoom mode or not */
    bool quick_zoomed() { return _quick_zoom_enabled; }

    void toggle_rotation_lock() { rotation_locked = !rotation_locked; }
    bool get_rotation_lock() const { return rotation_locked; }

    void zoom_grab_focus();

    void rotate_absolute_keep_point   (Geom::Point const &c, double const rotate);
    void rotate_relative_keep_point   (Geom::Point const &c, double const rotate);
    void rotate_absolute_center_point (Geom::Point const &c, double const rotate);
    void rotate_relative_center_point (Geom::Point const &c, double const rotate);

    enum CanvasFlip {
        FLIP_NONE       = 0,
        FLIP_HORIZONTAL = 1,
        FLIP_VERTICAL   = 2
    };
    void flip_absolute_keep_point   (Geom::Point const &c, CanvasFlip flip);
    void flip_relative_keep_point   (Geom::Point const &c, CanvasFlip flip);
    void flip_absolute_center_point (Geom::Point const &c, CanvasFlip flip);
    void flip_relative_center_point (Geom::Point const &c, CanvasFlip flip);
    bool is_flipped (CanvasFlip flip);

    double current_rotation() const { return _current_affine.getRotation(); }

    void scroll_absolute (Geom::Point const &point, bool is_scrolling = false);
    void scroll_relative (Geom::Point const &delta, bool is_scrolling = false);
    void scroll_relative_in_svg_coords (double dx, double dy, bool is_scrolling = false);
    bool scroll_to_point (Geom::Point const &s_dt, gdouble autoscrollspeed = 0);

    void getWindowGeometry (gint &x, gint &y, gint &w, gint &h);
    void setWindowPosition (Geom::Point p);
    void setWindowSize (gint w, gint h);
    void setWindowTransient (void* p, int transient_policy=1);
    Gtk::Window* getToplevel();  // To be removed in favor of getInkscapeWindow
    InkscapeWindow* getInkscapeWindow();
    void presentWindow();
    bool showInfoDialog( Glib::ustring const &message );
    bool warnDialog (Glib::ustring const &text);
    void toggleRulers();
    void toggleScrollbars();
    void layoutWidget();
    void destroyWidget();
    void setToolboxFocusTo (gchar const* label);
    Gtk::Toolbar* get_toolbar_by_name(const Glib::ustring& name); 
    void setToolboxAdjustmentValue (gchar const* id, double val);
    bool isToolboxButtonActive (gchar const *id);
    void updateNow();
    void updateCanvasNow();
    void storeDesktopPosition();

    void enableInteraction();
    void disableInteraction();

    void setWaitingCursor();
    void clearWaitingCursor();
    bool isWaitingCursor() const { return waiting_cursor; };

    void toggleGuidesLock();

    void toggleColorProfAdjust();
    bool colorProfAdjustEnabled();

    void toggleGrids();
    void toggleSplitMode();
    void toggleXRay();
    bool splitMode() const { return _split_canvas; };
    bool xrayMode() const { return _xray; };
    void toggleSnapGlobal();
    bool gridsEnabled() const { return grids_visible; };
    void showGrids(bool show, bool dirty_document = true);
    void toggleToolbar(gchar const *toolbar_name, unsigned int verbenum);

    bool is_iconified();
    bool is_darktheme();
    bool is_maximized();
    bool is_fullscreen();
    bool is_focusMode();

    void iconify();
    void maximize();
    void fullscreen();
    void focusMode(bool mode = true);
    /**
     * Reopen any dialogs that were open when inkscape last shutdown
     */
    void show_dialogs();

    // TODO return const ref instead of copy
    Geom::Affine w2d() const; //transformation from window to desktop coordinates (zoom/rotate).
    Geom::Point w2d(Geom::Point const &p) const;
    /// Transformation from desktop to window coordinates
    Geom::Affine d2w() const { return _current_affine.d2w(); }
    Geom::Point d2w(Geom::Point const &p) const;
    const Geom::Affine& doc2dt() const;
    Geom::Affine dt2doc() const;
    Geom::Point doc2dt(Geom::Point const &p) const;
    Geom::Point dt2doc(Geom::Point const &p) const;

    bool is_yaxisdown() const { return doc2dt()[3] > 0; }
    double yaxisdir() const { return doc2dt()[3]; }

    void setDocument (SPDocument* doc) override;
    bool shutdown() override;

    virtual bool onDeleteUI (GdkEventAny*);
    virtual bool onWindowStateEvent (GdkEventWindowState* event);

    void applyCurrentOrToolStyle(SPObject *obj, Glib::ustring const &tool_path, bool with_text);

private:
    GtkGesture *zoomgesture = nullptr;

    Inkscape::UI::View::EditWidgetInterface       *_widget;
    std::unique_ptr<Inkscape::MessageContext> _guides_message_context;
    bool _active;

    // This simple class ensures that _w2d is always in sync with _rotation and _scale
    // We keep rotation and scale separate to avoid having to extract them from the affine.
    // With offset, this describes fully how to map the drawing to the window.
    // Future: merge offset as a translation in w2d.
    class DesktopAffine {
      public:
        Geom::Affine w2d() const { return _w2d; };
        Geom::Affine d2w() const { return _d2w; };

        void setScale( Geom::Scale scale ) {
            _scale = scale;
            _update();
        }
        void addScale( Geom::Scale scale) {
            _scale *= scale;
            _update();
        }

        void setRotate( Geom::Rotate rotate ) {
            _rotate = rotate;
            _update();
        }
        void setRotate( double rotate ) {
            _rotate = Geom::Rotate( rotate );
            _update();
        }
        void addRotate( Geom::Rotate rotate ) {
            _rotate *= rotate;
            _update();
        }
        void addRotate( double rotate ) {
            _rotate *= Geom::Rotate( rotate );
            _update();
        }

        void setFlip( CanvasFlip flip ) {
            _flip = Geom::Scale();
            addFlip( flip );
        }

        bool isFlipped( CanvasFlip flip ) {
            if ((flip & FLIP_HORIZONTAL) && Geom::are_near(_flip[0], -1)) {
                return true;
            }
            if ((flip & FLIP_VERTICAL) && Geom::are_near(_flip[1], -1)) {
                return true;
            }
            return false;
        }

        void addFlip( CanvasFlip flip ) {
            if (flip & FLIP_HORIZONTAL) {
                _flip *= Geom::Scale(-1.0, 1.0);
            }
            if (flip & FLIP_VERTICAL) {
                _flip *= Geom::Scale(1.0, -1.0);
            }
            _update();
        }

        double getZoom() const {
            return _d2w.descrim();
        }

        double getRotation() const {
            return _rotate.angle();
        }

        void setOffset( Geom::Point offset ) {
            _offset = offset;
        }
        void addOffset( Geom::Point offset ) {
            _offset += offset;
        }
        Geom::Point getOffset() {
            return _offset;
        }

      private:
        void _update() {
            _d2w = _scale * _rotate * _flip;
            _w2d = _d2w.inverse();
        }            
        Geom::Affine  _w2d;      // Window to desktop
        Geom::Affine  _d2w;      // Desktop to window
        Geom::Rotate  _rotate;   // Rotate part of _w2d
        Geom::Scale   _scale;    // Scale part of _w2d, holds y-axis direction
        Geom::Scale   _flip;     // Flip part of _w2d
        Geom::Point   _offset;   // Point on canvas to align to (0,0) of window
    };

    DesktopAffine _current_affine;
    std::list<DesktopAffine> transforms_past;
    std::list<DesktopAffine> transforms_future;
    bool _split_canvas;
    bool _xray;
    bool _quick_zoom_enabled; ///< Signifies that currently we're in quick zoom mode
    DesktopAffine _quick_zoom_affine;  ///< The transform of the screen before quick zoom

    /*
     * Allow redrawing or refreshing if preferences change
     */
    class DesktopPrefObserver : public Inkscape::Preferences::Observer {
      public:
        DesktopPrefObserver(SPDesktop *desktop, Glib::ustring const &path)
            : Inkscape::Preferences::Observer(path)
            , _desktop(desktop) {
            Inkscape::Preferences *prefs = Inkscape::Preferences::get();
            prefs->addObserver(*this);
        }
      private:
        void notify(Inkscape::Preferences::Entry const &) override {
            _desktop->redrawDesktop();
        }
        SPDesktop *_desktop;
    };

    DesktopPrefObserver _image_render_observer;

    bool grids_visible; /* don't set this variable directly, use the method below */
    void set_grids_visible(bool visible);

    sigc::signal<void, SPDesktop*> _destroy_signal;
    sigc::signal<void,SPDesktop*,SPDocument*>     _document_replaced_signal;
    sigc::signal<void>                 _activate_signal;
    sigc::signal<void>                 _deactivate_signal;
    sigc::signal<void,SPDesktop*,Inkscape::UI::Tools::ToolBase*> _event_context_changed_signal;
    sigc::signal<void, gpointer>       _tool_subselection_changed;

    sigc::connection _activate_connection;
    sigc::connection _deactivate_connection;
    sigc::connection _sel_modified_connection;
    sigc::connection _sel_changed_connection;
    sigc::connection _reconstruction_start_connection;
    sigc::connection _reconstruction_finish_connection;
    sigc::connection _commit_connection;
    sigc::connection _modified_connection;

    void onResized (double, double) override;
    void onRedrawRequested() override;
    void onStatusMessage (Inkscape::MessageType type, gchar const *message) override;
    void onDocumentURISet (gchar const* uri) override;
    void onDocumentResized (double, double) override;

    static void _onActivate (SPDesktop* dt);
    static void _onDeactivate (SPDesktop* dt);
    static void _onSelectionModified (Inkscape::Selection *selection, guint flags, SPDesktop *dt);
};

#endif // SEEN_SP_DESKTOP_H

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :