ardour/libs/widgets/widgets/auto_spin.h

/*
    Copyright (C) 2000 Paul Barton-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 _WIDGETS_AUTO_SPIN_H_
#define _WIDGETS_AUTO_SPIN_H_

#ifdef interface
#undef interface
#endif

#include <gtkmm/adjustment.h>

#include "widgets/visibility.h"

namespace ArdourWidgets {

class LIBWIDGETS_API AutoSpin
{
public:
	AutoSpin (Gtk::Adjustment &adj, gfloat cr = 0, bool round_to_steps_yn = false);

	Gtk::Adjustment &get_adjustment() { return adjustment; }

	void use_left_as_decrement (bool yn) { left_is_decrement = yn; }
	void set_wrap (bool yn) { wrap = yn; }
	void set_climb_rate (gfloat cr) { climb_rate = cr; }
	void set_bounds (gfloat initial, gfloat low, gfloat high, bool with_reset = true);

	gint button_press (GdkEventButton *);
	gint stop_spinning (GdkEventButton *ignored_but_here_for_clicked);
	void start_spinning (bool decrementing, bool use_page);
	gint scroll_event (GdkEventScroll *);

private:
	Gtk::Adjustment &adjustment;
	gfloat climb_rate;
	gfloat timer_increment;
	gfloat initial;
	unsigned int timer_calls;
	bool have_timer;
	bool need_timer;
	bool wrap;
	gint timeout_tag;
	bool left_is_decrement;
	bool round_to_steps;

	static const unsigned int initial_timer_interval;
	static const unsigned int timer_interval;
	static const unsigned int climb_timer_calls;

	void stop_timer ();
	static gint _timer (void *arg);
	gint timer ();
	bool adjust_value (gfloat increment);
	void set_value (gfloat value);
};

} /* namespace */

#endif