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 gint point_type;
41 gint point_i; // the stop number of this point ( = 0 POINT_LG_BEGIN and POINT_RG_CENTER)
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();
83 bool isSelected();
85 void moveThisToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr);
86 void moveOtherToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr);
87 void updateMidstopDependencies (GrDraggable *draggable, bool write_repr);
88 void updateDependencies (bool write_repr);
90 bool mayMerge (GrDragger *other);
91 bool mayMerge (GrDraggable *da2);
93 bool isA (gint point_type);
94 bool isA (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);
96 void fireDraggables (bool write_repr, bool scale_radial = false, bool merging_focus = false);
97 };
99 /**
100 This is the root class of the gradient dragging machinery. It holds lists of GrDraggers
101 and of lines (simple canvas items). It also remembers one of the draggers as selected.
102 */
103 class GrDrag {
104 public: // FIXME: make more of this private!
106 GrDrag(SPDesktop *desktop);
107 ~GrDrag();
109 bool isNonEmpty() {return (draggers != NULL);}
110 bool hasSelection() {return (selected != NULL);}
112 // especially the selection must be private, fix gradient-context to remove direct access to it
113 GList *selected; // list of GrDragger*
114 void setSelected (GrDragger *dragger, bool add_to_selection = false, bool override = true);
115 void setDeselected (GrDragger *dragger);
116 void deselectAll();
117 void selectAll();
118 void selectByCoords(std::vector<NR::Point> coords);
120 void deleteSelected (bool just_one = false);
122 bool keep_selection;
124 GrDragger *getDraggerFor (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);
126 void grabKnot (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, gint x, gint y, guint32 etime);
128 bool local_change;
130 SPDesktop *desktop;
132 // lists of edges of selection bboxes, to snap draggers to
133 std::vector<double> hor_levels;
134 std::vector<double> vert_levels;
136 GList *draggers;
137 GSList *lines;
139 void updateDraggers ();
140 void updateLines ();
141 void updateLevels ();
143 void selected_move_nowrite (double x, double y, bool scale_radial);
144 void selected_move (double x, double y, bool write_repr = true, bool scale_radial = false);
145 void selected_move_screen (double x, double y);
147 void select_next ();
148 void select_prev ();
150 void selected_reverse_vector ();
152 private:
153 void deselect_all();
155 void addLine (NR::Point p1, NR::Point p2, guint32 rgba);
157 void addDragger (GrDraggable *draggable);
159 void addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke);
160 void addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke);
162 Inkscape::Selection *selection;
163 sigc::connection sel_changed_connection;
164 sigc::connection sel_modified_connection;
166 sigc::connection style_set_connection;
167 sigc::connection style_query_connection;
168 };
170 #endif