toggle_light.cpp

demonstrates how to create a custom control with xtd::forms::user_control control.

Windows

macOS

Gnome

#include <xtd/xtd>
 
namespace toggle_light_example {
  class toggle_light : public user_control {
  public:
    toggle_light() = default;
    
  protected:
    auto on_mouse_enter(const event_args&) -> void override {
      on = !on;
      invalidate();
    }
    
    auto on_paint(paint_event_args& e) -> void override {
      e.graphics().fill_ellipse(on ? system_brushes::accent() : system_brushes::control(), e.clip_rectangle());
    }
    
  private:
    bool on = false;
  };
  
  class main_form : public form {
  public:
    main_form() {
      text("Toggle light");
      client_size({600, 600});
      controls().add_range(toggle_lights);
 
      resize += [this] {
        auto step_x = as<int>(client_size().width / toggle_lights.get_length(0));
        auto step_y = as<int>(client_size().height / toggle_lights.get_length(1));
        
        for (auto x = 0; x < as<int>(toggle_lights.get_length(0)); ++x)
          for (auto y = 0; y < as<int>(toggle_lights.get_length(1)); ++y)
            // before C++23 : toggle_lights(x, y).bounds({x * step_x, y * step_y, step_x, step_y});
            toggle_lights[x, y].bounds({x * step_x, y * step_y, step_x, step_y});
      };
    }
        
  private:
    array<toggle_light, 2> toggle_lights = array<>::create_instance<toggle_light>(20, 20);
  };
}
 
auto main() -> int {
  application::run(toggle_light_example::main_form {});
}