2 Copyright (C) 2011-2013 Paul Davis
3 Author: Carl Hetherington <cth@carlh.net>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <cairomm/cairomm.h>
23 #include <gtkmm/label.h>
25 #include "pbd/stacktrace.h"
27 #include "canvas/text.h"
28 #include "canvas/canvas.h"
29 #include "canvas/utils.h"
32 using namespace ArdourCanvas;
34 Text::Text (Group* parent)
37 , _font_description (0)
38 , _alignment (Pango::ALIGN_LEFT)
41 , _need_redraw (false)
42 , _clamped_width (COORD_MAX)
49 delete _font_description;
53 Text::set (string const & text)
60 _bounding_box_dirty = true;
66 Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
72 Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
78 Text::redraw (Glib::RefPtr<Pango::Context> context) const
84 Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
89 Text::_redraw (Glib::RefPtr<Pango::Layout> layout) const
91 layout->set_text (_text);
93 if (_font_description) {
94 layout->set_font_description (*_font_description);
97 layout->set_alignment (_alignment);
102 layout->get_size (w, h);
104 _width = w / Pango::SCALE;
105 _height = h / Pango::SCALE;
107 _image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height);
109 Cairo::RefPtr<Cairo::Context> img_context = Cairo::Context::create (_image);
111 /* and draw, in the appropriate color of course */
113 set_source_rgba (img_context, _color);
115 layout->show_in_cairo_context (img_context);
117 /* text has now been rendered in _image and is ready for blit in
121 _need_redraw = false;
125 Text::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
135 Rect self = item_to_window (Rect (0, 0, min (_clamped_width, _width), _height));
137 context->rectangle (self.x0, self.y0, self.width(), self.height());
138 context->set_source (_image, self.x0, self.y0);
143 Text::clamp_width (double w)
149 Text::compute_bounding_box () const
151 if (!_canvas || _text.empty()) {
152 _bounding_box = boost::optional<Rect> ();
153 _bounding_box_dirty = false;
157 if (_bounding_box_dirty) {
158 if (_need_redraw || !_image) {
159 Glib::RefPtr<Pango::Context> context = Glib::wrap (gdk_pango_context_get()); // context now owns C object and will free it
162 _bounding_box = Rect (0, 0, min (_clamped_width, (double) _image->get_width()), _image->get_height());
163 _bounding_box_dirty = false;
168 Text::set_alignment (Pango::Alignment alignment)
172 _alignment = alignment;
174 _bounding_box_dirty = true;
179 Text::set_font_description (Pango::FontDescription font_description)
183 _font_description = new Pango::FontDescription (font_description);
186 _bounding_box_dirty = true;
191 Text::set_color (Color color)
203 Text::dump (ostream& o) const
207 o << _canvas->indent() << '\t' << " text = " << _text << endl
208 << _canvas->indent() << " color = " << _color;