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/*
Copyright (C) 2009 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __gtk2_ardour_cairo_widget_h__
#define __gtk2_ardour_cairo_widget_h__
#include <gtkmm/eventbox.h>
/** A parent class for widgets that are made up of a pixmap rendered using Cairo.
* The pixmap is painted to screen on GTK expose events, but the rendering
* is only done after set_dirty() has been called.
*/
class CairoWidget : public Gtk::EventBox
{
public:
CairoWidget ();
virtual ~CairoWidget ();
void set_dirty ();
/* widget states: unlike GTK, these OR-together so that
a widget can be both Active *and* Selected, rather than
each one being orthogonal.
*/
enum State {
Active = 0x1,
Mid = 0x2,
Selected = 0x4,
Prelight = 0x8,
Insensitive = 0x10,
};
State state() const { return _state; }
virtual void set_state (State, bool);
sigc::signal<void> StateChanged;
protected:
/** Render the widget to the given Cairo context */
virtual void render (cairo_t *) = 0;
virtual bool on_expose_event (GdkEventExpose *);
void on_size_allocate (Gtk::Allocation &);
Gdk::Color get_parent_bg ();
int _width; ///< pixmap width
int _height; ///< pixmap height
State _state;
private:
bool _dirty; ///< true if the pixmap requires re-rendering
GdkPixmap* _pixmap; ///< our pixmap
};
#endif
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