191 lines
3.6 KiB
C++
191 lines
3.6 KiB
C++
#include <gdk/gdk.h>
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#include <cairomm/cairomm.h>
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#include <gtkmm/label.h>
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#include "pbd/xml++.h"
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#include "pbd/stacktrace.h"
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#include "canvas/text.h"
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#include "canvas/canvas.h"
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#include "canvas/utils.h"
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using namespace std;
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using namespace ArdourCanvas;
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Text::Text (Group* parent)
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: Item (parent)
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, _color (0x000000ff)
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, _font_description (0)
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, _alignment (Pango::ALIGN_LEFT)
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, _width (0)
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, _height (0)
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, _need_redraw (false)
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{
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}
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Text::~Text ()
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{
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delete _font_description;
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}
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void
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Text::set (string const & text)
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{
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begin_change ();
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_text = text;
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_need_redraw = true;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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Text::redraw (Cairo::RefPtr<Cairo::Context> context) const
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{
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Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
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layout->set_text (_text);
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if (_font_description) {
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layout->set_font_description (*_font_description);
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}
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layout->set_alignment (_alignment);
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Pango::Rectangle ink_rect = layout->get_ink_extents();
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_origin.x = ink_rect.get_x() / Pango::SCALE;
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_origin.y = ink_rect.get_y() / Pango::SCALE;
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_width = _origin.x + ((ink_rect.get_width() + Pango::SCALE / 2) / Pango::SCALE);
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_height = _origin.y + ((ink_rect.get_height() + Pango::SCALE / 2) / Pango::SCALE);
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_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, _width, _height);
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Cairo::RefPtr<Cairo::Context> img_context = Cairo::Context::create (_image);
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/* and draw, in the appropriate color of course */
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set_source_rgba (img_context, _color);
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layout->show_in_cairo_context (img_context);
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/* text has now been rendered in _image and is ready for blit in
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* ::render
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*/
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_need_redraw = false;
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}
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void
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Text::compute_bounding_box () const
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{
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if (!_canvas || _text.empty()) {
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_bounding_box = boost::optional<Rect> ();
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_bounding_box_dirty = false;
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return;
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}
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PangoContext* _pc = gdk_pango_context_get ();
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Glib::RefPtr<Pango::Context> context = Glib::wrap (_pc); // context now owns _pc and will free it
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Glib::RefPtr<Pango::Layout> layout = Pango::Layout::create (context);
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layout->set_text (_text);
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layout->set_font_description (*_font_description);
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layout->set_alignment (_alignment);
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Pango::Rectangle const r = layout->get_ink_extents ();
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_bounding_box = Rect (
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r.get_x() / Pango::SCALE,
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r.get_y() / Pango::SCALE,
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(r.get_x() + r.get_width()) / Pango::SCALE,
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(r.get_y() + r.get_height()) / Pango::SCALE
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);
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_bounding_box_dirty = false;
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}
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void
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Text::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
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{
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if (_text.empty()) {
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return;
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}
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if (_need_redraw) {
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redraw (context);
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}
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context->set_source (_image, 0, 0);
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context->rectangle (0, 0, _width, _height);
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context->fill ();
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}
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XMLNode *
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Text::get_state () const
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{
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XMLNode* node = new XMLNode ("Text");
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#ifdef CANVAS_DEBUG
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if (!name.empty ()) {
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node->add_property ("name", name);
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}
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#endif
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return node;
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}
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void
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Text::set_state (XMLNode const * /*node*/)
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{
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/* XXX */
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}
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void
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Text::set_alignment (Pango::Alignment alignment)
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{
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begin_change ();
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_alignment = alignment;
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_need_redraw = true;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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Text::set_font_description (Pango::FontDescription font_description)
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{
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begin_change ();
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_font_description = new Pango::FontDescription (font_description);
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_need_redraw = true;
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_bounding_box_dirty = true;
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end_change ();
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}
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void
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Text::set_color (Color color)
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{
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begin_change ();
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_color = color;
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_need_redraw = true;
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end_change ();
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}
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void
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Text::dump (ostream& o) const
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{
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Item::dump (o);
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o << _canvas->indent() << '\t' << " text = " << _text << endl
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<< _canvas->indent() << " color = " << _color;
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o << endl;
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}
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