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#ifndef __GRADIENT_DRAG_H__
#define __GRADIENT_DRAG_H__

 * On-canvas gradient dragging 
 * Authors:
 *   bulia byak <bulia@users.sf.net>
 * 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, and the point number (from the
GrPoint enum).
00033 struct GrDraggable {
      GrDraggable(SPItem *item, guint point_num, bool fill_or_stroke);

      SPItem *item;
      guint point_num;
      bool fill_or_stroke;

      bool mayMerge (GrDraggable *da2);

    inline int equals (GrDraggable *other) {
            return ((item == other->item) && (point_num == other->point_num) && (fill_or_stroke == other->fill_or_stroke));

struct 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.
00055 struct GrDragger {
      GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable);

      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?). */
00069       guint   handler_id;

      GSList *draggables;

      void addDraggable(GrDraggable *draggable);

      void updateKnotShape();
      void updateTip();

      void moveThisToDraggable (SPItem *item, guint point_num, bool fill_or_stroke, bool write_repr);
      void moveOtherToDraggable (SPItem *item, guint point_num, bool fill_or_stroke, bool write_repr);
      void updateDependencies (bool write_repr);

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

      bool isA (guint point_num);
      bool isA (SPItem *item, guint point_num, 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.
00095 struct GrDrag {
      GrDrag(SPDesktop *desktop);

      void addLine (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);

      GrDragger *selected;
      void setSelected (GrDragger *dragger);

      GrDragger *getDraggerFor (SPItem *item, guint point_num, bool fill_or_stroke);

      void grabKnot (SPItem *item, guint point_num, bool fill_or_stroke, gint x, gint y, guint32 etime);

      bool local_change;

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

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

      // 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 (double x, double y);
      void selected_move_screen (double x, double y);

      void select_next ();
      void select_prev ();

      void selected_reverse_vector ();


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