livetrax/libs/surfaces/push2/menu.h

/*
    Copyright (C) 2016 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 __ardour_push2_menu_h__
#define __ardour_push2_menu_h__

#include <vector>

namespace Cairo {
	class Context;
	class Region;
}

#include <pangomm/fontdescription.h>

#include "pbd/signals.h"

#include "canvas/container.h"

namespace ArdourCanvas {
	class Text;
	class Rectangle;
	class Rect;
}

namespace ArdourSurface {

class Push2Menu : public ArdourCanvas::Container
{
   public:
	Push2Menu (ArdourCanvas::Item* parent, std::vector<std::string>);

	void render (ArdourCanvas::Rect const& area, Cairo::RefPtr<Cairo::Context> context) const;

	void set_wrap (bool);
	void set_active (uint32_t index);

	uint32_t active () const { return _active; }
	uint32_t items() const { return displays.size(); }

	uint32_t rows() const { return nrows; }
	uint32_t cols() const { return ncols; }

	void set_layout (int cols, int rows);
	void set_font_description (Pango::FontDescription);
	void set_text_color (ArdourCanvas::Color);
	void set_active_color (ArdourCanvas::Color);

	bool can_scroll_left() const { return first >= nrows; }
	bool can_scroll_right() const { return last < displays.size() - 1; }

	enum Direction { DirectionUp, DirectionDown, DirectionLeft, DirectionRight };
	void scroll (Direction, bool page = false);

	PBD::Signal0<void> ActiveChanged;
	PBD::Signal0<void> Rearranged;

   private:
	std::vector<ArdourCanvas::Text*> displays;
	ArdourCanvas::Rectangle* active_bg;

	void rearrange (uint32_t initial_display);

	double   baseline;
	int      row_start;
	int      col_start;
	uint32_t ncols;
	uint32_t nrows;
	bool     wrap;
	uint32_t first;
	uint32_t last;
	uint32_t _active;

	ArdourCanvas::Color text_color;
	ArdourCanvas::Color active_color;
	ArdourCanvas::Color contrast_color;
	Pango::FontDescription font_description;

	inline int active_row () const { return _active % nrows; }
	inline int active_col () const { return (_active / nrows); }
	inline int active_top () const { return active_col() * nrows; }
};

} // namespace

#endif /* __ardour_push2_menu_h__ */