acc2dd48f52fee39cb5ab4589e9270d1d0c74629
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 <libnr/nr-forward.h>
23 #include <knot-enums.h>
25 struct SPItem;
26 struct SPKnot;
28 /**
29 This class represents a single draggable point of a gradient. It remembers the item
30 which has the gradient, whether it's fill or stroke, the point type (from the
31 GrPointType enum), and the point number (needed if more than 2 stops are present).
32 */
33 struct GrDraggable {
34 GrDraggable(SPItem *item, guint point_type, guint point_i, bool fill_or_stroke);
35 virtual ~GrDraggable();
37 SPItem *item;
38 gint point_type;
39 gint point_i; // the stop number of this point ( = 0 POINT_LG_BEGIN and POINT_RG_CENTER)
40 bool fill_or_stroke;
42 SPObject *getServer();
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 virtual ~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, bool fill_or_stroke);
95 bool isA (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);
97 void fireDraggables (bool write_repr, bool scale_radial = false, bool merging_focus = false);
98 };
100 /**
101 This is the root class of the gradient dragging machinery. It holds lists of GrDraggers
102 and of lines (simple canvas items). It also remembers one of the draggers as selected.
103 */
104 class GrDrag {
105 public: // FIXME: make more of this private!
107 GrDrag(SPDesktop *desktop);
108 virtual ~GrDrag();
110 bool isNonEmpty() {return (draggers != NULL);}
111 bool hasSelection() {return (selected != NULL);}
112 guint numSelected() {return (selected? g_list_length(selected) : 0);}
113 guint numDraggers() {return (draggers? g_list_length(draggers) : 0);}
114 guint singleSelectedDraggerNumDraggables() {return (selected? g_slist_length(((GrDragger *) selected->data)->draggables) : 0);}
115 guint singleSelectedDraggerSingleDraggableType() {return (selected? ((GrDraggable *) ((GrDragger *) selected->data)->draggables->data)->point_type : 0);}
117 // especially the selection must be private, fix gradient-context to remove direct access to it
118 GList *selected; // list of GrDragger*
119 void setSelected (GrDragger *dragger, bool add_to_selection = false, bool override = true);
120 void setDeselected (GrDragger *dragger);
121 void deselectAll();
122 void selectAll();
123 void selectByCoords(std::vector<NR::Point> coords);
124 void selectRect(Geom::Rect const &r);
126 bool dropColor(SPItem *item, gchar *c, NR::Point p);
128 SPStop *addStopNearPoint (SPItem *item, NR::Point mouse_p, double tolerance);
130 void deleteSelected (bool just_one = false);
132 guint32 getColor();
134 bool keep_selection;
136 GrDragger *getDraggerFor (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke);
138 void grabKnot (GrDragger *dragger, gint x, gint y, guint32 etime);
139 void grabKnot (SPItem *item, gint point_type, gint point_i, bool fill_or_stroke, gint x, gint y, guint32 etime);
141 bool local_change;
143 SPDesktop *desktop;
145 // lists of edges of selection bboxes, to snap draggers to
146 std::vector<double> hor_levels;
147 std::vector<double> vert_levels;
149 GList *draggers;
150 GSList *lines;
152 void updateDraggers ();
153 void updateLines ();
154 void updateLevels ();
156 void selected_move_nowrite (double x, double y, bool scale_radial);
157 void selected_move (double x, double y, bool write_repr = true, bool scale_radial = false);
158 void selected_move_screen (double x, double y);
160 GrDragger *select_next ();
161 GrDragger *select_prev ();
163 void selected_reverse_vector ();
165 private:
166 void deselect_all();
168 void addLine (SPItem *item, NR::Point p1, NR::Point p2, guint32 rgba);
170 void addDragger (GrDraggable *draggable);
172 void addDraggersRadial (SPRadialGradient *rg, SPItem *item, bool fill_or_stroke);
173 void addDraggersLinear (SPLinearGradient *lg, SPItem *item, bool fill_or_stroke);
175 Inkscape::Selection *selection;
176 sigc::connection sel_changed_connection;
177 sigc::connection sel_modified_connection;
179 sigc::connection style_set_connection;
180 sigc::connection style_query_connection;
181 };
183 #endif