text.h

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/*
 * Copyright (C) 2012 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2013-2016 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2015-2017 Robin Gareus <robin@gareus.org>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __ardour_canvas_text_h__
#define __ardour_canvas_text_h__
 
#include <map>
 
#include <pangomm/fontdescription.h>
#include <pangomm/layout.h>
 
#include "canvas/visibility.h"
#include "canvas/item.h"
 
namespace ArdourCanvas {
 
class LIBCANVAS_API Text : public Item
{
public:
        Text (Canvas*);
        Text (Item*);
        ~Text();
 
        void render (Rect const &, Cairo::RefPtr<Cairo::Context>) const;
        void compute_bounding_box () const;
        void _size_allocate (Rect const&);
 
        Gtkmm2ext::Color color () const { return _color; }
        void set_color (Gtkmm2ext::Color);
 
        void set (std::string const &);
        void set_font_description (Pango::FontDescription);
        void set_alignment (Pango::Alignment);
 
        void clamp_width (double);
 
        double width() const;
        double height() const;
 
        void set_size_chars (int nchars);
        void dump (std::ostream&) const;
 
        std::string text() const { return _text; }
        double text_width() const;
        double text_height() const;
 
        void set_height_based_on_allocation (bool yn);
 
        static int font_size_for_height (Distance height, std::string const & font_family, Glib::RefPtr<Pango::Context> const &);
        static void drop_height_maps ();
 
private:
        std::string             _text;
        Gtkmm2ext::Color        _color;
        Pango::FontDescription* _font_description;
        Pango::Alignment        _alignment;
        mutable Cairo::RefPtr<Cairo::ImageSurface> _image;
        mutable Duple           _origin;
        mutable double          _width;
        mutable double          _height;
        mutable bool            _need_redraw;
        mutable double          _width_correction;
        double                  _clamped_width;
        bool                    _height_based_on_allocation;
 
        void _redraw () const;
 
        typedef std::map<Distance,int> FontSizeMap;
        typedef std::map<std::string,FontSizeMap> FontSizeMaps;
 
        static FontSizeMaps font_size_maps;
};
 
}
 
#endif /* __ardour_canvas_text_h__ */