b9a2fdcc22aa66204818e697958b588079427589
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 SPObject *getServer();
46 bool mayMerge (GrDraggable *da2);
48 inline int equals (GrDraggable *other) {
49 return ((item == other->item) && (point_type == other->point_type) && (point_i == other->point_i) && (fill_or_stroke == other->fill_or_stroke));
50 }
51 };
53 class GrDrag;
55 /**
56 This class holds together a visible on-canvas knot and a list of draggables that need to
57 be moved when the knot moves. Normally there's one draggable in the list, but there may
58 be more when draggers are snapped together.
59 */
60 struct GrDragger {
61 GrDragger (GrDrag *parent, NR::Point p, GrDraggable *draggable);
62 ~GrDragger();
64 GrDrag *parent;
66 SPKnot *knot;
68 // position of the knot, desktop coords
69 NR::Point point;
70 // position of the knot before it began to drag; updated when released
71 NR::Point point_original;
73 /** Connection to \a knot's "moved" signal, for blocking it (unused?). */
74 guint handler_id;
76 GSList *draggables;
78 void addDraggable(GrDraggable *draggable);
80 void updateKnotShape();
81 void updateTip();
83 void select();
84 void deselect();
85 bool isSelected();
87 void moveThisToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr);
88 void moveOtherToDraggable (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, bool write_repr);
89 void updateMidstopDependencies (GrDraggable *draggable, bool write_repr);
90 void updateDependencies (bool write_repr);
92 bool mayMerge (GrDragger *other);
93 bool mayMerge (GrDraggable *da2);
95 bool isA (gint point_type);
96 bool isA (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);
98 void fireDraggables (bool write_repr, bool scale_radial = false, bool merging_focus = false);
99 };
101 /**
102 This is the root class of the gradient dragging machinery. It holds lists of GrDraggers
103 and of lines (simple canvas items). It also remembers one of the draggers as selected.
104 */
105 class GrDrag {
106 public: // FIXME: make more of this private!
108 GrDrag(SPDesktop *desktop);
109 ~GrDrag();
111 bool isNonEmpty() {return (draggers != NULL);}
112 bool hasSelection() {return (selected != NULL);}
113 guint numSelected() {return (selected? g_list_length(selected) : 0);}
114 guint numDraggers() {return (draggers? g_list_length(draggers) : 0);}
115 guint singleSelectedDraggerNumDraggables() {return (selected? g_slist_length(((GrDragger *) selected->data)->draggables) : 0);}
116 guint singleSelectedDraggerSingleDraggableType() {return (selected? ((GrDraggable *) ((GrDragger *) selected->data)->draggables->data)->point_type : 0);}
118 // especially the selection must be private, fix gradient-context to remove direct access to it
119 GList *selected; // list of GrDragger*
120 void setSelected (GrDragger *dragger, bool add_to_selection = false, bool override = true);
121 void setDeselected (GrDragger *dragger);
122 void deselectAll();
123 void selectAll();
124 void selectByCoords(std::vector<NR::Point> coords);
126 void deleteSelected (bool just_one = false);
128 bool keep_selection;
130 GrDragger *getDraggerFor (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);
132 void grabKnot (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, gint x, gint y, guint32 etime);
134 bool local_change;
136 SPDesktop *desktop;
138 // lists of edges of selection bboxes, to snap draggers to
139 std::vector<double> hor_levels;
140 std::vector<double> vert_levels;
142 GList *draggers;
143 GSList *lines;
145 void updateDraggers ();
146 void updateLines ();
147 void updateLevels ();
149 void selected_move_nowrite (double x, double y, bool scale_radial);
150 void selected_move (double x, double y, bool write_repr = true, bool scale_radial = false);
151 void selected_move_screen (double x, double y);
153 GrDragger *select_next ();
154 GrDragger *select_prev ();
156 void selected_reverse_vector ();
158 private:
159 void deselect_all();
161 void addLine (NR::Point p1, NR::Point p2, guint32 rgba);
163 void addDragger (GrDraggable *draggable);
165 void addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke);
166 void addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke);
168 Inkscape::Selection *selection;
169 sigc::connection sel_changed_connection;
170 sigc::connection sel_modified_connection;
172 sigc::connection style_set_connection;
173 sigc::connection style_query_connection;
174 };
176 #endif