/** 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;
}
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();
}