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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).
*/
struct GrDraggable {
GrDraggable(SPItem *item, guint point_num, bool fill_or_stroke);
~GrDraggable();
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.
*/
struct GrDragger {
GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable);
~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?). */
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.
*/
struct GrDrag {
GrDrag(SPDesktop *desktop);
~GrDrag();
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 ();
};
#endif
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