#ifndef SEEN_GRADIENT_DRAG_H

#define SEEN_GRADIENT_DRAG_H

#include <stddef.h>

#include <sigc++/sigc++.h>

#include <vector>

#include <glib.h>

#include <glibmm/ustring.h>

#include <2geom/point.h>

#include "knot-enums.h"

#include "sp-gradient.h" // TODO refactor enums to external .h file

#include "sp-mesh-array.h"

struct SPKnot;

class SPDesktop;

class SPCSSAttr;

class SPLinearGradient;

class SPMeshGradient;

class SPItem;

class SPObject;

class SPRadialGradient;

class SPStop;

namespace Inkscape {

class Selection;

} // namespace Inkscape

struct GrDraggable {

GrDraggable(SPItem *item, GrPointType point_type, guint point_i, Inkscape::PaintTarget fill_or_stroke);

virtual ~GrDraggable();

SPItem *item;

GrPointType point_type;

gint point_i; // the stop number of this point ( = 0 POINT_LG_BEGIN and POINT_RG_CENTER)

Inkscape::PaintTarget fill_or_stroke;

SPObject *getServer();

bool mayMerge(GrDraggable *da2);

inline int equals(GrDraggable *other) {

return ((item == other->item) && (point_type == other->point_type) && (point_i == other->point_i) && (fill_or_stroke == other->fill_or_stroke));

}

};

class GrDrag;

struct GrDragger {

GrDragger(GrDrag *parent, Geom::Point p, GrDraggable *draggable);

virtual ~GrDragger();

GrDrag *parent;

SPKnot *knot;

// position of the knot, desktop coords

Geom::Point point;

// position of the knot before it began to drag; updated when released

Geom::Point point_original;

/** Connection to \a knot's "moved" signal, for blocking it (unused?). */

guint handler_id;

GSList *draggables;

void addDraggable(GrDraggable *draggable);

void updateKnotShape();

void updateTip();

void select();

void deselect();

bool isSelected();

/* Given one GrDraggable, these all update other draggables belonging to same GrDragger */

void moveThisToDraggable(SPItem *item, GrPointType point_type, gint point_i, Inkscape::PaintTarget fill_or_stroke, bool write_repr);

void moveOtherToDraggable(SPItem *item, GrPointType point_type, gint point_i, Inkscape::PaintTarget fill_or_stroke, bool write_repr);

void updateMidstopDependencies(GrDraggable *draggable, bool write_repr);

void updateDependencies(bool write_repr);

/* Update handles/tensors when mesh corner moved */

void updateHandles( Geom::Point pc_old, MeshNodeOperation op );

bool mayMerge(GrDragger *other);

bool mayMerge(GrDraggable *da2);

bool isA(GrPointType point_type);

bool isA(SPItem *item, GrPointType point_type, Inkscape::PaintTarget fill_or_stroke);

bool isA(SPItem *item, GrPointType point_type, gint point_i, Inkscape::PaintTarget fill_or_stroke);

void fireDraggables(bool write_repr, bool scale_radial = false, bool merging_focus = false);

};

class GrDrag {

public: // FIXME: make more of this private!

GrDrag(SPDesktop *desktop);

virtual ~GrDrag();

bool isNonEmpty() {return (draggers != NULL);}

bool hasSelection() {return (selected != NULL);}

guint numSelected() {return (selected? g_list_length(selected) : 0);}

guint numDraggers() {return (draggers? g_list_length(draggers) : 0);}

guint singleSelectedDraggerNumDraggables() {

return (selected? g_slist_length(( static_cast<GrDragger *>(selected->data))->draggables) : 0);

}

guint singleSelectedDraggerSingleDraggableType() {

return (selected? (static_cast<GrDraggable*>((static_cast<GrDragger*>(selected->data))->draggables->data))->point_type : 0);}

// especially the selection must be private, fix gradient-context to remove direct access to it

GList *selected; // list of GrDragger*

void setSelected(GrDragger *dragger, bool add_to_selection = false, bool override = true);

void setDeselected(GrDragger *dragger);

void deselectAll();

void selectAll();

void selectByCoords(std::vector<Geom::Point> coords);

void selectByStop(SPStop *stop, bool add_to_selection = true, bool override = true);

void selectRect(Geom::Rect const &r);

bool dropColor(SPItem *item, gchar const *c, Geom::Point p);

SPStop *addStopNearPoint(SPItem *item, Geom::Point mouse_p, double tolerance);

void deleteSelected(bool just_one = false);

guint32 getColor();

bool keep_selection;

GrDragger *getDraggerFor(SPItem *item, GrPointType point_type, gint point_i, Inkscape::PaintTarget fill_or_stroke);

void grabKnot(GrDragger *dragger, gint x, gint y, guint32 etime);

void grabKnot(SPItem *item, GrPointType point_type, gint point_i, Inkscape::PaintTarget fill_or_stroke, gint x, gint y, guint32 etime);

bool local_change;

SPDesktop *desktop;

// lists of edges of selection bboxes, to snap draggers to

std::vector<double> hor_levels;

std::vector<double> vert_levels;

GList *draggers;

GSList *lines;

void updateDraggers();

void updateLines();

void updateLevels();

bool mouseOver();

void selected_move_nowrite(double x, double y, bool scale_radial);

void selected_move(double x, double y, bool write_repr = true, bool scale_radial = false);

void selected_move_screen(double x, double y);

GrDragger *select_next();

GrDragger *select_prev();

void selected_reverse_vector();

private:

void deselect_all();

void addLine( SPItem *item, Geom::Point p1, Geom::Point p2, Inkscape::PaintTarget fill_or_stroke);

void addCurve(SPItem *item, Geom::Point p0, Geom::Point p1, Geom::Point p2, Geom::Point p3, Inkscape::PaintTarget fill_or_stroke);

void addDragger(GrDraggable *draggable);

void addDraggersRadial(SPRadialGradient *rg, SPItem *item, Inkscape::PaintTarget fill_or_stroke);

void addDraggersLinear(SPLinearGradient *lg, SPItem *item, Inkscape::PaintTarget fill_or_stroke);

void addDraggersMesh( SPMeshGradient *mg, SPItem *item, Inkscape::PaintTarget fill_or_stroke);

bool styleSet( const SPCSSAttr *css );

Glib::ustring makeStopSafeColor( gchar const *str, bool &isNull );

Inkscape::Selection *selection;

sigc::connection sel_changed_connection;

sigc::connection sel_modified_connection;

sigc::connection style_set_connection;

sigc::connection style_query_connection;

};

#endif // SEEN_GRADIENT_DRAG_H