Example #1
0
/** Expose event handler.
 * @param event event info structure.
 * @return signal return value
 */
bool
SkillGuiGraphDrawingArea::on_expose_event(GdkEventExpose* event)
{
  update_translations();
  // This is where we draw on the window
  Glib::RefPtr<Gdk::Window> window = get_window();
  if(window) {
    //Gtk::Allocation allocation = get_allocation();
    //const int width = allocation.get_width();
    //const int height = allocation.get_height();
    
    // coordinates for the center of the window
    //int xc, yc;
    //xc = width / 2;
    //yc = height / 2;
    
    __cairo = window->create_cairo_context();
    __cairo->set_source_rgb(1, 1, 1);
    __cairo->paint();

    if (__graph) {
      Glib::Timer t;
      gvRender(__gvc, __graph, (char *)"skillguicairo", NULL);
      t.stop();
      //printf("Rendering took %f seconds\n", t.elapsed());
    }

    __cairo.clear();
  }
  return true;
}
Example #2
0
void 
ViewDrawingArea::draw_buffer()
{
#ifdef DEBUG
std::cerr << "VA->val:"<<_vadj->get_value() <<" VA->upper:"<<_vadj->get_upper() << std::endl << std::flush;
#endif

	Feed *feed = AppContext::get().get_feed();
	if (feed == NULL) 
		return;

	if (AppContext::get().get_display_type() == FULL)
	{
		render_full_article();
		return;
	}

	// Dimensions of drawing area
	Gtk::Allocation allocation = get_allocation();
	const int width = allocation.get_width();
	const int height = allocation.get_height();

	// First determine start item
	Cairo::RefPtr<Cairo::Context> cr = _pixmap->create_cairo_context();

#ifdef DEBUG
	/// This code was meant to investigate the 500ms delay with pango
	/// at start of rendering.
	if (!_layout_prepared)
	{
Glib::Timer sw;
sw.start();
		Glib::RefPtr<Pango::Layout> pl = Pango::Layout::create (cr);
		const char *fonts[] = {"Sans 10", "Sans 14"};
		for (unsigned i = 0; i < sizeof(fonts)/sizeof(const char*); ++i)
		{
			Pango::FontDescription fdesc (fonts[i]);
			pl->set_font_description (fdesc);
			pl->set_width (10 * Pango::SCALE); // force line break
			pl->set_markup ("<b>Show Us Your Freaky Geek Costumes</b>\nHitting the streets in a scary, tech-themed outfit this Halloween? We want to see it. Find out how your Sergey Brin costume (or is it David Duchovny?) could be featured on Wired News. test\n test");
			Pango::Rectangle irect, lrect;
			pl->get_extents (irect, lrect);
		}
		_layout_prepared = true;
sw.stop();
unsigned long l;
sw.elapsed(l);
std::cerr << "Time spent rendering: " << l << " us" << std::endl << std::flush;
	}
#endif

	const item_list_t items = feed->get_items();
	item_list_t::const_iterator start_item;
	const int n_items = items.size();
	double y = 0.0;

	if (n_items == 0)
		start_item = items.end();
	else
	{
		// Set start_item and h
		int start = static_cast<int> (_vadj->get_value());
		double h = 0.0;
		if (_vadj->get_value() > 0 && _vadj->get_value() == _vadj->get_upper())
		{
			// This will give a blank page when pulling the handle
			// full down. While unusual, it might make sense with
			// an ever-growing newslist.
			y = 0.0;
			start_item = items.end();
		}
		else
		{
			start_item = items.begin();
			for (int i = 0; i < start; ++i)
				++start_item;
			if (start < 0)
				start = 0;

			double prop = _vadj->get_value() - start;
			if (prop > 0.0)
			{
				(*start_item)->make_display_unit();
				ItemDisplayUnit *du = (*start_item)->get_display_unit();
				du->layout (cr);
				h = du->get_height();
			}
			y = - h * prop;
#ifdef DEBUG
std::cerr << "prop:"<<prop <<" y:"<<y << std::endl << std::flush;
#endif

		}
	}

	// clip to the area indicated by the expose event so that we only redraw
	// the portion of the window that needs to be redrawn
	cr->reset_clip();
	cr->rectangle (0.0, 0.0, width, height);
	cr->clip();

	// Black on white
	cr->set_source_rgb (1.0, 1.0, 1.0);
	cr->paint();
	cr->set_source_rgb (0.0, 0.0, 0.0);

	// Render text
	item_list_t::const_iterator it = start_item;
	_top_item = *start_item;
	_topitem_y = y;
	int count = 0;
	for (; it != items.end() && y < height; ++it, ++count)
	{
		(*it)->make_display_unit();
		ItemDisplayUnit *du = (*it)->get_display_unit();
		du->render (cr, 0, y);
		y += du->get_height();
	}

	cr->show_page();

	// Scrollbar settings can now be specified
	_vadj->set_upper (n_items);
	//_vadj->set_page_size (count - 1 + );
	_vadj->set_step_increment (1);
	_vadj->set_page_increment (count);
	_vadj->changed();

}