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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 <stddef.h>
#include <glib.h>
#include <sigc++/sigc++.h>
#include <vector>
#include <forward.h>
#include <libnr/nr-forward.h>
#include <2geom/point.h>
#include <knot-enums.h>
struct SPItem;
struct SPKnot;
/**
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).
*/
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.
*/
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();
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.
*/
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<Geom::Point> coords);
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, 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 ();
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, 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);
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
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