text: /*
   * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #pragma once
  
  #include <Kernel/Console.h>
  #include <Kernel/Devices/KeyboardDevice.h>
  #include <Kernel/TTY/TTY.h>
  #include <LibVT/Terminal.h>
  
  namespace Kernel {
  
  class VirtualConsole final : public TTY
      , public KeyboardClient
      , public VT::TerminalClient {
      AK_MAKE_ETERNAL
  public:
      VirtualConsole(unsigned index);
      virtual ~VirtualConsole() override;
  
      static void switch_to(unsigned);
      static void initialize();
  
      bool is_graphical() { return m_graphical; }
      void set_graphical(bool graphical);
  
  private:
      // ^KeyboardClient
      virtual void on_key_pressed(KeyboardDevice::Event) override;
  
      // ^TTY
      virtual ssize_t on_tty_write(const u8*, ssize_t) override;
      virtual StringView tty_name() const override { return m_tty_name; }
      virtual void echo(u8) override;
  
      // ^TerminalClient
      virtual void beep() override;
      virtual void set_window_title(const StringView&) override;
      virtual void set_window_progress(int, int) override;
      virtual void terminal_did_resize(u16 columns, u16 rows) override;
      virtual void terminal_history_changed() override;
      virtual void emit(const u8*, size_t) override;
  
      // ^CharacterDevice
      virtual const char* class_name() const override { return "VirtualConsole"; }
  
      void set_active(bool);
  
      void flush_vga_cursor();
      void flush_dirty_lines();
  
      unsigned m_index;
      bool m_active { false };
      bool m_graphical { false };
  
      void clear_vga_row(u16 row);
      void set_vga_start_row(u16 row);
      u16 m_vga_start_row { 0 };
      u16 m_current_vga_start_address { 0 };
      u8* m_current_vga_window { nullptr };
  
      VT::Terminal m_terminal;
  
      String m_tty_name;
  };
  
  }
  