1 /** @file
2 * Desktop-bound visual control object
3 */
4 /* Authors:
5 * Krzysztof KosiĆski <tweenk.pl@gmail.com>
6 *
7 * Copyright (C) 2009 Authors
8 * Released under GNU GPL, read the file 'COPYING' for more information
9 */
11 #ifndef SEEN_UI_TOOL_CONTROL_POINT_H
12 #define SEEN_UI_TOOL_CONTROL_POINT_H
14 #include <boost/utility.hpp>
15 #include <sigc++/sigc++.h>
16 #include <gdkmm.h>
17 #include <gtkmm.h>
18 #include <2geom/point.h>
20 #include "forward.h"
21 #include "util/accumulators.h"
22 #include "display/sodipodi-ctrl.h"
24 namespace Inkscape {
25 namespace UI {
27 // most of the documentation is in the .cpp file
29 class ControlPoint : boost::noncopyable, public sigc::trackable {
30 public:
31 typedef Inkscape::Util::ReverseInterruptible RInt;
32 typedef Inkscape::Util::Interruptible Int;
33 // these have to be public, because GCC doesn't allow protected types in constructors,
34 // even if the constructors are protected themselves.
35 struct ColorEntry {
36 guint32 fill;
37 guint32 stroke;
38 };
39 struct ColorSet {
40 ColorEntry normal;
41 ColorEntry mouseover;
42 ColorEntry clicked;
43 };
44 enum State {
45 STATE_NORMAL,
46 STATE_MOUSEOVER,
47 STATE_CLICKED
48 };
50 virtual ~ControlPoint();
52 /// @name Adjust the position of the control point
53 /// @{
54 /** Current position of the control point. */
55 Geom::Point const &position() const { return _position; }
56 operator Geom::Point const &() { return _position; }
57 virtual void move(Geom::Point const &pos);
58 virtual void setPosition(Geom::Point const &pos);
59 virtual void transform(Geom::Matrix const &m);
60 /// @}
62 /// @name Toggle the point's visibility
63 /// @{
64 bool visible() const;
65 virtual void setVisible(bool v);
66 /// @}
68 /// @name Transfer grab from another event handler
69 /// @{
70 void transferGrab(ControlPoint *from, GdkEventMotion *event);
71 /// @}
73 /// @name Receive notifications about control point events
74 /// @{
75 /*sigc::signal<void, Geom::Point const &, Geom::Point &, GdkEventMotion*> signal_dragged;
76 sigc::signal<bool, GdkEventButton*>::accumulated<RInt> signal_clicked;
77 sigc::signal<bool, GdkEventButton*>::accumulated<RInt> signal_doubleclicked;
78 sigc::signal<bool, GdkEventMotion*>::accumulated<Int> signal_grabbed;
79 sigc::signal<void, GdkEventButton*> signal_ungrabbed;*/
80 /// @}
82 /// @name Inspect the state of the control point
83 /// @{
84 State state() { return _state; }
85 bool mouseovered() { return this == mouseovered_point; }
86 /// @}
88 static ControlPoint *mouseovered_point;
89 static sigc::signal<void, ControlPoint*> signal_mouseover_change;
90 static Glib::ustring format_tip(char const *format, ...) G_GNUC_PRINTF(1,2);
92 // temporarily public, until snap delay is refactored a little
93 virtual bool _eventHandler(GdkEvent *event);
95 protected:
96 ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, Gtk::AnchorType anchor,
97 SPCtrlShapeType shape, unsigned int size, ColorSet *cset = 0, SPCanvasGroup *group = 0);
98 ControlPoint(SPDesktop *d, Geom::Point const &initial_pos, Gtk::AnchorType anchor,
99 Glib::RefPtr<Gdk::Pixbuf> pixbuf, ColorSet *cset = 0, SPCanvasGroup *group = 0);
101 /// @name Handle control point events in subclasses
102 /// @{
103 /**
104 * Called when the user moves the point beyond the drag tolerance with the first button held
105 * down. Return true if you called transferGrab() during this method.
106 * @param event Motion event when drag tolerance was exceeded */
107 virtual bool grabbed(GdkEventMotion *event);
108 /**
109 * Called while dragging, but before moving the knot to new position.
110 * @param pos Old position, always equal to position()
111 * @param new_pos New position (after drag). This is passed as a non-const reference,
112 * so you can change it from the handler - that's how constrained dragging is implemented.
113 * @param event Motion event */
114 virtual void dragged(Geom::Point &new_pos, GdkEventMotion *event);
115 /**
116 * @var ControlPoint::signal_ungrabbed
117 * Emitted when the control point finishes a drag.
118 * @param event Button release event
119 */
120 virtual void ungrabbed(GdkEventButton *event);
121 /**
122 * Called when the control point is clicked, at mouse button release. Your override should
123 * return true if the click had some effect. If it did nothing, return false. Improperly
124 * implementing this method can cause the default context menu not to appear when a control
125 * point is right-clicked.
126 * @param event Button release event */
127 virtual bool clicked(GdkEventButton *event);
128 /**
129 * Called when the control point is doubleclicked, at mouse button release.
130 * @param event Button release event */
131 virtual bool doubleclicked(GdkEventButton *);
132 /// @}
134 /// @name Manipulate the control point's appearance in subclasses
135 /// @{
136 virtual void _setState(State state);
137 void _setColors(ColorEntry c);
139 unsigned int _size() const;
140 SPCtrlShapeType _shape() const;
141 GtkAnchorType _anchor() const;
142 Glib::RefPtr<Gdk::Pixbuf> _pixbuf();
144 void _setSize(unsigned int size);
145 void _setShape(SPCtrlShapeType shape);
146 void _setAnchor(GtkAnchorType anchor);
147 void _setPixbuf(Glib::RefPtr<Gdk::Pixbuf>);
148 /// @}
150 virtual Glib::ustring _getTip(unsigned /*state*/) { return ""; }
151 virtual Glib::ustring _getDragTip(GdkEventMotion */*event*/) { return ""; }
152 virtual bool _hasDragTips() { return false; }
154 SPDesktop *const _desktop; ///< The desktop this control point resides on.
155 SPCanvasItem * _canvas_item; ///< Visual representation of the control point.
156 ColorSet *_cset; ///< Colors used to represent the point
157 State _state;
159 static int const _grab_event_mask;
160 static Geom::Point const &_last_click_event_point() { return _drag_event_origin; }
161 static Geom::Point const &_last_drag_origin() { return _drag_origin; }
163 private:
164 ControlPoint(ControlPoint const &other);
165 void operator=(ControlPoint const &other);
167 static int _event_handler(SPCanvasItem *item, GdkEvent *event, ControlPoint *point);
168 static void _setMouseover(ControlPoint *, unsigned state);
169 static void _clearMouseover();
170 bool _updateTip(unsigned state);
171 bool _updateDragTip(GdkEventMotion *event);
172 void _setDefaultColors();
173 void _commonInit();
175 Geom::Point _position; ///< Current position in desktop coordinates
176 gulong _event_handler_connection;
178 static Geom::Point _drag_event_origin;
179 static Geom::Point _drag_origin;
180 static bool _event_grab;
181 static bool _drag_initiated;
182 };
184 extern ControlPoint::ColorSet invisible_cset;
187 } // namespace UI
188 } // namespace Inkscape
190 #endif
192 /*
193 Local Variables:
194 mode:c++
195 c-file-style:"stroustrup"
196 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
197 indent-tabs-mode:nil
198 fill-column:99
199 End:
200 */
201 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :