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livetrax/gtk2_ardour/cairo_widget.h

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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 rendered using Cairo.
*/
class CairoWidget : public Gtk::EventBox
{
public:
CairoWidget ();
virtual ~CairoWidget ();
void set_dirty ();
/* widget states: unlike GTK, visual states like "Selected" or "Prelight"
are orthogonal to active states.
*/
enum ActiveState {
Active = 1,
Mid,
};
enum VisualState {
/* these can be OR-ed together */
Selected = 0x1,
Prelight = 0x2,
Insensitive = 0x4,
};
ActiveState active_state() const { return _active_state; }
VisualState visual_state() const { return _visual_state; }
virtual void set_active_state (ActiveState);
virtual void set_visual_state (VisualState);
virtual void unset_active_state () { set_active_state (ActiveState (0)); }
virtual void unset_visual_state () { set_visual_state (VisualState (0)); }
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
ActiveState _active_state;
VisualState _visual_state;
private:
GdkPixmap* _pixmap; ///< our pixmap
};
#endif