Hi everybody. I found the tutorial on gtkmm developer page about
multi-threading. But when I wanted to adapt for my needs, I couldn't figure
out how to do it. I have a DrawingArea widget within a window and I want to
do the drawing in separate thread because as the drawing became more
complex, the gui thread gets locked every time when something is drawn. I
know the theory: I should use a Dispatcher to send the data to gui thread,
but in tutorial I saw that when the worker thread completed the job, the
gui thread is notified. But I can't do that, or at least I don't know how
to do that in this situation. Any help will be appreciated.
Here is the code:
#include <gtkmm.h>
class DrawingArea : public Gtk::DrawingArea
{
public:
DrawingArea()
{
this->set_hexpand();
this->set_vexpand();
}
~DrawingArea() {};
protected:
bool on_draw(const Cairo::RefPtr<Cairo::Context>& context)
{
// drawing stuff
return true;
}
};
class Window : public Gtk::Window
{
public:
Window()
{
this->set_default_size(800, 600);
this->add(this->m_drawing_area);
}
~Window() {};
protected:
DrawingArea m_drawing_area;
};
int main(int argc, char* argv[])
{
Glib::RefPtr<Gtk::Application> application = Gtk::Application::create(argc,
argv, "org.draw_in_separate_thread");
Window window;
return application->run(window);
}
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