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#ifndef __GRADIENT_DRAG_H__
#define __GRADIENT_DRAG_H__

 * On-canvas gradient dragging 
 * Authors:
 *   bulia byak <bulia@users.sf.net>
 *   Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
 * Copyright (C) 2007 Johan Engelen
 * Copyright (C) 2005 Authors
 * Released under GNU GPL, read the file 'COPYING' for more information

#include <glib/gslist.h>
#include <sigc++/sigc++.h>
#include <vector>

#include <forward.h>
#include <knot-enums.h>

struct SPItem;
struct SPKnot;
namespace NR {
class Point;

This class represents a single draggable point of a gradient. It remembers the item
which has the gradient, whether it's fill or stroke, the point type (from the
GrPointType enum), and the point number (needed if more than 2 stops are present).
00035 struct GrDraggable {
      GrDraggable(SPItem *item, guint point_type, guint point_i, bool fill_or_stroke);
    virtual ~GrDraggable();

      SPItem *item;
      gint point_type;
      gint point_i;  // the stop number of this point ( = 0 POINT_LG_BEGIN and POINT_RG_CENTER)
      bool 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;

This class holds together a visible on-canvas knot and a list of draggables that need to
be moved when the knot moves. Normally there's one draggable in the list, but there may
be more when draggers are snapped together.
00060 struct GrDragger {
      GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable);
    virtual ~GrDragger();

      GrDrag *parent;

      SPKnot *knot;

      // position of the knot, desktop coords
      NR::Point point;
      // position of the knot before it began to drag; updated when released
      NR::Point point_original;

      /** Connection to \a knot's "moved" signal, for blocking it (unused?). */
00074       guint   handler_id;

      GSList *draggables;

      void addDraggable(GrDraggable *draggable);

      void updateKnotShape();
      void updateTip();
      void select();
      void deselect();
      bool isSelected();

      void moveThisToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr);
      void moveOtherToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr);
    void updateMidstopDependencies (GrDraggable *draggable, bool write_repr);
    void updateDependencies (bool write_repr);

      bool mayMerge (GrDragger *other);
      bool mayMerge (GrDraggable *da2);

    bool isA (gint point_type);
    bool isA (SPItem *item, gint point_type, bool fill_or_stroke);
    bool isA (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);

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

This is the root class of the gradient dragging machinery. It holds lists of GrDraggers
and of lines (simple canvas items). It also remembers one of the draggers as selected.
00106 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(((GrDragger *) selected->data)->draggables) : 0);}
            guint singleSelectedDraggerSingleDraggableType() {return (selected? ((GrDraggable *) ((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<NR::Point> coords);
    void selectRect(NR::Rect const &r);

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

            SPStop *addStopNearPoint (SPItem *item, NR::Point mouse_p, double tolerance);
    void deleteSelected (bool just_one = false);

    bool copy ();
    bool keep_selection;    
    GrDragger *getDraggerFor (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);

    void grabKnot (GrDragger *dragger, gint x, gint y, guint32 etime);
    void grabKnot (SPItem *item, gint point_type, gint point_i, bool 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 ();

    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 ();

    void deselect_all();

    void addLine (SPItem *item, NR::Point p1, NR::Point p2, guint32 rgba);

    void addDragger (GrDraggable *draggable);

    void addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke);
    void addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke);

    Inkscape::Selection *selection;
    sigc::connection sel_changed_connection;
    sigc::connection sel_modified_connection;

    sigc::connection style_set_connection;
    sigc::connection style_query_connection;


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