form_and_thread.cpp

demonstrates how a thread can update ui with xtd::forms::control::invoke method.

Windows

macOS

Gnome

#include <xtd/xtd>
 
class form_thread : public form {
public:
  form_thread() {
    text("Form and thread example");
    form_closed += delegate_ {
      closed = true;
    };
    
    messages.parent(*this);
    messages.dock(dock_style::fill);
    
    for (auto index = 0_z; index < environment::processor_count() - 1; ++index) {
      thread::start_new([&] {
        auto counter = 0u;
        auto thread_name = string::format("thread {}", thread::current_thread().managed_thread_id());
        thread::current_thread().name(thread_name);
        while (!closed) {
          thread::sleep(50_ms);
          ++counter;
          messages.begin_invoke([&, counter, thread_name] {
            messages.items().add(string::format("{}: counter: {}", thread_name, counter));
            messages.selected_index(messages.items().count() - 1);
          });
        }
      });
    }
  }
  
private:
  list_box messages;
  bool closed = false;
};
 
auto main() -> int {
  application::run(form_thread());
}