2 Copyright (C) 2009 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __gtk2_ardour_cairo_widget_h__
21 #define __gtk2_ardour_cairo_widget_h__
23 #include <gtkmm/eventbox.h>
25 /** A parent class for widgets that are made up of a pixmap rendered using Cairo.
26 * The pixmap is painted to screen on GTK expose events, but the rendering
27 * is only done after set_dirty() has been called.
30 class CairoWidget : public Gtk::EventBox
34 virtual ~CairoWidget ();
38 /* widget states: unlike GTK, visual states like "Selected" or "Prelight"
39 are orthogonal to active states.
48 /* these can be OR-ed together */
54 ActiveState active_state() const { return _active_state; }
55 VisualState visual_state() const { return _visual_state; }
56 virtual void set_active_state (ActiveState);
57 virtual void set_visual_state (VisualState);
58 virtual void unset_active_state () { set_active_state (ActiveState (0)); }
59 virtual void unset_visual_state () { set_visual_state (VisualState (0)); }
61 sigc::signal<void> StateChanged;
64 /** Render the widget to the given Cairo context */
65 virtual void render (cairo_t *) = 0;
66 virtual bool on_expose_event (GdkEventExpose *);
67 void on_size_allocate (Gtk::Allocation &);
68 Gdk::Color get_parent_bg ();
70 int _width; ///< pixmap width
71 int _height; ///< pixmap height
72 ActiveState _active_state;
73 VisualState _visual_state;
76 GdkPixmap* _pixmap; ///< our pixmap
77 bool _dirty; ///< true if the pixmap requires re-rendering