application_context.h

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#pragma once
#include <xtd/object.h>
#include "form.h"
 
namespace xtd {
  namespace forms {
    class application;
    
    class application_context : public object {
    public:
      application_context() = default;
      explicit application_context(const form& main_form) {this->main_form(main_form);}
 
      ~application_context() {
        if (main_form_ != nullptr) main_form_->handle_destroyed -= {*this, &application_context::on_main_form_closed};
      }
      
      const form& main_form() const {return *main_form_;}
      form& main_form() {return *main_form_;}
      void main_form(const form& main_form) {
        if (main_form_ != nullptr) main_form_->handle_destroyed -= {*this, &application_context::on_main_form_closed};
        main_form_ = const_cast<form*>(&main_form);
        main_form_->visible_changed += {*this, &application_context::on_main_form_closed};
      }
 
      std::any tag() const {return tag_;}
      void tag(std::any tag) {tag_ = tag;}
 
      event<application_context, event_handler> thread_exit;
      
      void exit_thread() {exit_thread_core();}
      
    protected:
      virtual void exit_thread_core() {thread_exit(*this, event_args::empty);}
      
      virtual void on_main_form_closed(object& sender, const event_args& e) {
        if (!main_form_->visible()) {
          if (!main_form_->can_close_) main_form_->close();
          if (main_form_->can_close_) {
            main_form_->handle_destroyed -= {*this, &application_context::on_main_form_closed};
            exit_thread_core();
          }
        }
      }
      
    private:
      friend class application;
 
      form* main_form_ = nullptr;
      std::any tag_;
    };
  }
}