1 #ifndef __GRADIENT_DRAG_H__
2 #define __GRADIENT_DRAG_H__
4 /*
5 * On-canvas gradient dragging
6 *
7 * Authors:
8 * bulia byak <bulia@users.sf.net>
9 * Johan Engelen <j.b.c.engelen@ewi.utwente.nl>
10 *
11 * Copyright (C) 2007 Johan Engelen
12 * Copyright (C) 2005 Authors
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 */
17 #include <glib/gslist.h>
18 #include <sigc++/sigc++.h>
19 #include <vector>
21 #include <forward.h>
22 #include <knot-enums.h>
24 struct SPItem;
25 struct SPKnot;
26 namespace NR {
27 class Point;
28 }
30 /**
31 This class represents a single draggable point of a gradient. It remembers the item
32 which has the gradient, whether it's fill or stroke, the point type (from the
33 GrPointType enum), and the point number (needed if more than 2 stops are present).
34 */
35 struct GrDraggable {
36 GrDraggable(SPItem *item, guint point_type, guint point_i, bool fill_or_stroke);
37 ~GrDraggable();
39 SPItem *item;
40 guint point_type;
41 guint point_i; // the stop number of this point ( = 0 for all types except POINT_LG_MID)
42 bool fill_or_stroke;
44 bool mayMerge (GrDraggable *da2);
46 inline int equals (GrDraggable *other) {
47 return ((item == other->item) && (point_type == other->point_type) && (point_i == other->point_i) && (fill_or_stroke == other->fill_or_stroke));
48 }
49 };
51 class GrDrag;
53 /**
54 This class holds together a visible on-canvas knot and a list of draggables that need to
55 be moved when the knot moves. Normally there's one draggable in the list, but there may
56 be more when draggers are snapped together.
57 */
58 struct GrDragger {
59 GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable);
60 ~GrDragger();
62 GrDrag *parent;
64 SPKnot *knot;
66 // position of the knot, desktop coords
67 NR::Point point;
68 // position of the knot before it began to drag; updated when released
69 NR::Point point_original;
71 /** Connection to \a knot's "moved" signal, for blocking it (unused?). */
72 guint handler_id;
74 GSList *draggables;
76 void addDraggable(GrDraggable *draggable);
78 void updateKnotShape();
79 void updateTip();
81 void select();
82 void deselect();
84 void moveThisToDraggable (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, bool write_repr);
85 void moveOtherToDraggable (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, bool write_repr);
86 void updateMidstopDependencies (GrDraggable *draggable, bool write_repr);
87 void updateDependencies (bool write_repr);
89 bool mayMerge (GrDragger *other);
90 bool mayMerge (GrDraggable *da2);
92 bool isA (guint point_type);
93 bool isA (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke);
95 void fireDraggables (bool write_repr, bool scale_radial = false, bool merging_focus = false);
96 };
98 /**
99 This is the root class of the gradient dragging machinery. It holds lists of GrDraggers
100 and of lines (simple canvas items). It also remembers one of the draggers as selected.
101 */
102 class GrDrag {
103 public: // FIXME: make more of this private!
105 GrDrag(SPDesktop *desktop);
106 ~GrDrag();
108 // especially the selection must be private, fix gradient-context to remove direct access to it
109 GList *selected; // list of GrDragger*
110 void setSelected (GrDragger *dragger, bool add_to_selection = false, bool override = true);
111 void setDeselected (GrDragger *dragger);
112 void deselectAll();
114 void deleteSelected (bool just_one = false);
116 bool keep_selection;
118 GrDragger *getDraggerFor (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke);
120 void grabKnot (SPItem *item, guint point_type, guint point_i, bool fill_or_stroke, gint x, gint y, guint32 etime);
122 bool local_change;
124 SPDesktop *desktop;
126 // lists of edges of selection bboxes, to snap draggers to
127 std::vector<double> hor_levels;
128 std::vector<double> vert_levels;
130 GList *draggers;
131 GSList *lines;
133 void updateDraggers ();
134 void updateLines ();
135 void updateLevels ();
137 void selected_move (double x, double y);
138 void selected_move_screen (double x, double y);
140 void select_next ();
141 void select_prev ();
143 void selected_reverse_vector ();
145 private:
146 void deselect_all();
148 void addLine (NR::Point p1, NR::Point p2, guint32 rgba);
150 void addDragger (GrDraggable *draggable);
152 void addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke);
153 void addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke);
155 Inkscape::Selection *selection;
156 sigc::connection sel_changed_connection;
157 sigc::connection sel_modified_connection;
159 sigc::connection style_set_connection;
160 sigc::connection style_query_connection;
161 };
163 #endif