fios_gui.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "saveload/saveload.h"
#include "error.h"
#include "gui.h"
#include "gfx_func.h"
#include "command_func.h"
#include "network/network.h"
#include "network/network_content.h"
#include "strings_func.h"
#include "fileio_func.h"
#include "fios.h"
#include "window_func.h"
#include "tilehighlight_func.h"
#include "querystring_gui.h"
#include "engine_func.h"
#include "landscape_type.h"
#include "date_func.h"
#include "core/geometry_func.hpp"
#include "gamelog.h"
#include "stringfilter_type.h"
#include "misc_cmd.h"
 
#include "widgets/fios_widget.h"
 
#include "table/sprites.h"
#include "table/strings.h"
 
#include "safeguards.h"
 
LoadCheckData _load_check_data;    
 
static bool _fios_path_changed;
static bool _savegame_sort_dirty;
 
 
void LoadCheckData::Clear()
{
  this->checkable = false;
  this->error = INVALID_STRING_ID;
  free(this->error_data);
  this->error_data = nullptr;
 
  this->map_size_x = this->map_size_y = 256; // Default for old savegames which do not store mapsize.
  this->current_date = 0;
  this->settings = {};
 
  for (auto &pair : this->companies) {
    delete pair.second;
  }
  companies.clear();
 
  GamelogFree(this->gamelog_action, this->gamelog_actions);
  this->gamelog_action = nullptr;
  this->gamelog_actions = 0;
 
  ClearGRFConfigList(&this->grfconfig);
}
 
static const NWidgetPart _nested_load_dialog_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_SL_CAPTION),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
  EndContainer(),
  /* Current directory and free space */
  NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
 
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    /* Left side : filter box and available files */
    NWidget(NWID_VERTICAL),
      /* Filter box with label */
      NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), SetResize(1, 1),
        NWidget(NWID_HORIZONTAL), SetPadding(WD_FRAMERECT_TOP, 0, WD_FRAMERECT_BOTTOM, 0),
          SetPIP(WD_FRAMETEXT_LEFT, WD_FRAMETEXT_RIGHT, 0),
            NWidget(WWT_TEXT, COLOUR_GREY), SetFill(0, 1), SetDataTip(STR_SAVELOAD_FILTER_TITLE , STR_NULL),
            NWidget(WWT_EDITBOX, COLOUR_GREY, WID_SL_FILTER), SetFill(1, 0), SetMinimalSize(50, 12), SetResize(1, 0),
              SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
        EndContainer(),
      EndContainer(),
      /* Sort buttons */
      NWidget(NWID_HORIZONTAL),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_SORT_BYNAME), SetDataTip(STR_SORT_BY_CAPTION_NAME, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_SORT_BYDATE), SetDataTip(STR_SORT_BY_CAPTION_DATE, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
        EndContainer(),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_SL_HOME_BUTTON), SetMinimalSize(12, 12), SetDataTip(SPR_HOUSE_ICON, STR_SAVELOAD_HOME_BUTTON),
      EndContainer(),
      /* Files */
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_FILE_BACKGROUND),
          NWidget(WWT_INSET, COLOUR_GREY, WID_SL_DRIVES_DIRECTORIES_LIST), SetFill(1, 1), SetPadding(2, 2, 2, 2),
              SetDataTip(0x0, STR_SAVELOAD_LIST_TOOLTIP), SetResize(1, 10), SetScrollbar(WID_SL_SCROLLBAR), EndContainer(),
        EndContainer(),
        NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_SL_SCROLLBAR),
      EndContainer(),
      /* Online Content button */
      NWidget(NWID_SELECTION, INVALID_COLOUR, WID_SL_CONTENT_DOWNLOAD_SEL),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_CONTENT_DOWNLOAD), SetResize(1, 0),
            SetDataTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
      EndContainer(),
    EndContainer(),
 
    /* Right side : game details */
    NWidget(NWID_VERTICAL),
      NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_DETAILS), SetResize(1, 1), SetFill(1, 1),
      EndContainer(),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_MISSING_NEWGRFS), SetDataTip(STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_BUTTON, STR_NEWGRF_SETTINGS_FIND_MISSING_CONTENT_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
      NWidget(NWID_HORIZONTAL),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_NEWGRF_INFO), SetDataTip(STR_INTRO_NEWGRF_SETTINGS, STR_NULL), SetFill(1, 0), SetResize(1, 0),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_LOAD_BUTTON), SetDataTip(STR_SAVELOAD_LOAD_BUTTON, STR_SAVELOAD_LOAD_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
        EndContainer(),
        NWidget(WWT_RESIZEBOX, COLOUR_GREY),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static const NWidgetPart _nested_load_heightmap_dialog_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_SL_CAPTION),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
  EndContainer(),
  /* Current directory and free space */
  NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
 
  /* Filter box with label */
  NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), SetResize(1, 1),
    NWidget(NWID_HORIZONTAL), SetPadding(WD_FRAMERECT_TOP, 0, WD_FRAMERECT_BOTTOM, 0),
      SetPIP(WD_FRAMETEXT_LEFT, WD_FRAMETEXT_RIGHT, 0),
        NWidget(WWT_TEXT, COLOUR_GREY), SetFill(0, 1), SetDataTip(STR_SAVELOAD_FILTER_TITLE , STR_NULL),
        NWidget(WWT_EDITBOX, COLOUR_GREY, WID_SL_FILTER), SetFill(1, 0), SetMinimalSize(50, 12), SetResize(1, 0),
          SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
    EndContainer(),
  EndContainer(),
  /* Sort Buttons */
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_SORT_BYNAME), SetDataTip(STR_SORT_BY_CAPTION_NAME, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
      NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_SORT_BYDATE), SetDataTip(STR_SORT_BY_CAPTION_DATE, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
    EndContainer(),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_SL_HOME_BUTTON), SetMinimalSize(12, 12), SetDataTip(SPR_HOUSE_ICON, STR_SAVELOAD_HOME_BUTTON),
  EndContainer(),
  /* Files */
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_FILE_BACKGROUND),
      NWidget(WWT_INSET, COLOUR_GREY, WID_SL_DRIVES_DIRECTORIES_LIST), SetFill(1, 1), SetPadding(2, 2, 2, 2),
          SetDataTip(0x0, STR_SAVELOAD_LIST_TOOLTIP), SetResize(1, 10), SetScrollbar(WID_SL_SCROLLBAR), EndContainer(),
    EndContainer(),
    NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_SL_SCROLLBAR),
  EndContainer(),
  /* Online Content and Load button */
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_CONTENT_DOWNLOAD), SetResize(1, 0), SetFill(1, 0),
        SetDataTip(STR_INTRO_ONLINE_CONTENT, STR_INTRO_TOOLTIP_ONLINE_CONTENT),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_LOAD_BUTTON), SetResize(1, 0), SetFill(1, 0),
        SetDataTip(STR_SAVELOAD_LOAD_BUTTON, STR_SAVELOAD_LOAD_HEIGHTMAP_TOOLTIP),
    NWidget(WWT_RESIZEBOX, COLOUR_GREY),
  EndContainer(),
};
 
static const NWidgetPart _nested_save_dialog_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_SL_CAPTION),
    NWidget(WWT_DEFSIZEBOX, COLOUR_GREY),
  EndContainer(),
  /* Current directory and free space */
  NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_BACKGROUND), SetFill(1, 0), SetResize(1, 0), EndContainer(),
  NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
    /* Left side : filter box and available files */
    NWidget(NWID_VERTICAL),
      /* Filter box with label */
      NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), SetResize(1, 1),
        NWidget(NWID_HORIZONTAL), SetPadding(WD_FRAMERECT_TOP, 0, WD_FRAMERECT_BOTTOM, 0),
          SetPIP(WD_FRAMETEXT_LEFT, WD_FRAMETEXT_RIGHT, 0),
          NWidget(WWT_TEXT, COLOUR_GREY), SetFill(0, 1), SetDataTip(STR_SAVELOAD_FILTER_TITLE , STR_NULL),
          NWidget(WWT_EDITBOX, COLOUR_GREY, WID_SL_FILTER), SetFill(1, 0), SetMinimalSize(50, 12), SetResize(1, 0),
            SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
        EndContainer(),
      EndContainer(),
      /* Sort buttons */
      NWidget(NWID_HORIZONTAL),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_SORT_BYNAME), SetDataTip(STR_SORT_BY_CAPTION_NAME, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
          NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_SORT_BYDATE), SetDataTip(STR_SORT_BY_CAPTION_DATE, STR_TOOLTIP_SORT_ORDER), SetFill(1, 0), SetResize(1, 0),
        EndContainer(),
        NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_SL_HOME_BUTTON), SetMinimalSize(12, 12), SetDataTip(SPR_HOUSE_ICON, STR_SAVELOAD_HOME_BUTTON),
      EndContainer(),
      /* Files */
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_PANEL, COLOUR_GREY, WID_SL_FILE_BACKGROUND),
          NWidget(WWT_INSET, COLOUR_GREY, WID_SL_DRIVES_DIRECTORIES_LIST), SetPadding(2, 2, 2, 2),
              SetDataTip(0x0, STR_SAVELOAD_LIST_TOOLTIP), SetResize(1, 10), SetScrollbar(WID_SL_SCROLLBAR), EndContainer(),
        EndContainer(),
        NWidget(NWID_VSCROLLBAR, COLOUR_GREY, WID_SL_SCROLLBAR),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_GREY),
        NWidget(WWT_EDITBOX, COLOUR_GREY, WID_SL_SAVE_OSK_TITLE), SetPadding(2, 2, 2, 2), SetFill(1, 0), SetResize(1, 0),
            SetDataTip(STR_SAVELOAD_OSKTITLE, STR_SAVELOAD_EDITBOX_TOOLTIP),
      EndContainer(),
      /* Save/delete buttons */
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_DELETE_SELECTION), SetDataTip(STR_SAVELOAD_DELETE_BUTTON, STR_SAVELOAD_DELETE_TOOLTIP), SetFill(1, 0), SetResize(1, 0),
        NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_SL_SAVE_GAME),        SetDataTip(STR_SAVELOAD_SAVE_BUTTON, STR_SAVELOAD_SAVE_TOOLTIP),     SetFill(1, 0), SetResize(1, 0),
      EndContainer(),
    EndContainer(),
 
    /* Right side : game details */
    NWidget(WWT_PANEL, COLOUR_GREY),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_SL_DETAILS), SetResize(1, 1), SetFill(1, 1),
      NWidget(NWID_HORIZONTAL),
        NWidget(NWID_SPACER), SetResize(1, 0), SetFill(1, 1),
        NWidget(WWT_RESIZEBOX, COLOUR_GREY),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static const TextColour _fios_colours[] = {
  TC_LIGHT_BROWN,  // DFT_OLD_GAME_FILE
  TC_ORANGE,       // DFT_GAME_FILE
  TC_YELLOW,       // DFT_HEIGHTMAP_BMP
  TC_ORANGE,       // DFT_HEIGHTMAP_PNG
  TC_LIGHT_BLUE,   // DFT_FIOS_DRIVE
  TC_DARK_GREEN,   // DFT_FIOS_PARENT
  TC_DARK_GREEN,   // DFT_FIOS_DIR
  TC_ORANGE,       // DFT_FIOS_DIRECT
};
 
 
static void SortSaveGameList(FileList &file_list)
{
  size_t sort_start = 0;
  size_t sort_end = 0;
 
  /* Directories are always above the files (FIOS_TYPE_DIR)
   * Drives (A:\ (windows only) are always under the files (FIOS_TYPE_DRIVE)
   * Only sort savegames/scenarios, not directories
   */
  for (const auto &item : file_list) {
    switch (item.type) {
      case FIOS_TYPE_DIR:    sort_start++; break;
      case FIOS_TYPE_PARENT: sort_start++; break;
      case FIOS_TYPE_DRIVE:  sort_end++;   break;
      default: break;
    }
  }
 
  std::sort(file_list.begin() + sort_start, file_list.end() - sort_end);
}
 
struct SaveLoadWindow : public Window {
private:
  static const uint EDITBOX_MAX_SIZE   =  50;
 
  QueryString filename_editbox; 
  AbstractFileType abstract_filetype; 
  SaveLoadOperation fop;        
  FileList fios_items;          
  FiosItem o_dir;               
  const FiosItem *selected;     
  const FiosItem *highlighted;  
  Scrollbar *vscroll;
 
  StringFilter string_filter; 
  QueryString filter_editbox; 
  std::vector<bool> fios_items_shown; 
 
  static void SaveGameConfirmationCallback(Window *w, bool confirmed)
  {
    /* File name has already been written to _file_to_saveload */
    if (confirmed) _switch_mode = SM_SAVE_GAME;
  }
 
  static void SaveHeightmapConfirmationCallback(Window *w, bool confirmed)
  {
    /* File name has already been written to _file_to_saveload */
    if (confirmed) _switch_mode = SM_SAVE_HEIGHTMAP;
  }
 
public:
 
  void GenerateFileName()
  {
    GenerateDefaultSaveName(this->filename_editbox.text.buf, &this->filename_editbox.text.buf[this->filename_editbox.text.max_bytes - 1]);
    this->filename_editbox.text.UpdateSize();
  }
 
  SaveLoadWindow(WindowDesc *desc, AbstractFileType abstract_filetype, SaveLoadOperation fop)
      : Window(desc), filename_editbox(64), abstract_filetype(abstract_filetype), fop(fop), filter_editbox(EDITBOX_MAX_SIZE)
  {
    assert(this->fop == SLO_SAVE || this->fop == SLO_LOAD);
 
    /* For saving, construct an initial file name. */
    if (this->fop == SLO_SAVE) {
      switch (this->abstract_filetype) {
        case FT_SAVEGAME:
          this->GenerateFileName();
          break;
 
        case FT_SCENARIO:
        case FT_HEIGHTMAP:
          this->filename_editbox.text.Assign("UNNAMED");
          break;
 
        default:
          NOT_REACHED();
      }
    }
    this->querystrings[WID_SL_SAVE_OSK_TITLE] = &this->filename_editbox;
    this->filename_editbox.ok_button = WID_SL_SAVE_GAME;
 
    this->CreateNestedTree(true);
    if (this->fop == SLO_LOAD && this->abstract_filetype == FT_SAVEGAME) {
      this->GetWidget<NWidgetStacked>(WID_SL_CONTENT_DOWNLOAD_SEL)->SetDisplayedPlane(SZSP_HORIZONTAL);
    }
 
    /* Select caption string of the window. */
    StringID caption_string;
    switch (this->abstract_filetype) {
      case FT_SAVEGAME:
        caption_string = (this->fop == SLO_SAVE) ? STR_SAVELOAD_SAVE_CAPTION : STR_SAVELOAD_LOAD_CAPTION;
        break;
 
      case FT_SCENARIO:
        caption_string = (this->fop == SLO_SAVE) ? STR_SAVELOAD_SAVE_SCENARIO : STR_SAVELOAD_LOAD_SCENARIO;
        break;
 
      case FT_HEIGHTMAP:
        caption_string = (this->fop == SLO_SAVE) ? STR_SAVELOAD_SAVE_HEIGHTMAP : STR_SAVELOAD_LOAD_HEIGHTMAP;
        break;
 
      default:
        NOT_REACHED();
    }
    this->GetWidget<NWidgetCore>(WID_SL_CAPTION)->widget_data = caption_string;
 
    this->vscroll = this->GetScrollbar(WID_SL_SCROLLBAR);
    this->FinishInitNested(0);
 
    this->LowerWidget(WID_SL_DRIVES_DIRECTORIES_LIST);
    this->querystrings[WID_SL_FILTER] = &this->filter_editbox;
    this->filter_editbox.cancel_button = QueryString::ACTION_CLEAR;
 
    /* pause is only used in single-player, non-editor mode, non-menu mode. It
     * will be unpaused in the WE_DESTROY event handler. */
    if (_game_mode != GM_MENU && !_networking && _game_mode != GM_EDITOR) {
      Command<CMD_PAUSE>::Post(PM_PAUSED_SAVELOAD, true);
    }
    SetObjectToPlace(SPR_CURSOR_ZZZ, PAL_NONE, HT_NONE, WC_MAIN_WINDOW, 0);
 
    this->OnInvalidateData(SLIWD_RESCAN_FILES);
 
    ResetObjectToPlace();
 
    /* Select the initial directory. */
    o_dir.type = FIOS_TYPE_DIRECT;
    std::string dir;
    switch (this->abstract_filetype) {
      case FT_SAVEGAME:
        dir = FioFindDirectory(SAVE_DIR);
        break;
 
      case FT_SCENARIO:
        dir = FioFindDirectory(SCENARIO_DIR);
        break;
 
      case FT_HEIGHTMAP:
        dir = FioFindDirectory(HEIGHTMAP_DIR);
        break;
 
      default:
        dir = _personal_dir;
    }
    strecpy(o_dir.name, dir.c_str(), lastof(o_dir.name));
 
    switch (this->fop) {
      case SLO_SAVE:
        /* Focus the edit box by default in the save window */
        this->SetFocusedWidget(WID_SL_SAVE_OSK_TITLE);
        break;
 
      default:
        this->SetFocusedWidget(WID_SL_FILTER);
    }
  }
 
  void Close() override
  {
    /* pause is only used in single-player, non-editor mode, non menu mode */
    if (!_networking && _game_mode != GM_EDITOR && _game_mode != GM_MENU) {
      Command<CMD_PAUSE>::Post(PM_PAUSED_SAVELOAD, false);
    }
    this->Window::Close();
  }
 
  void DrawWidget(const Rect &r, int widget) const override
  {
    switch (widget) {
      case WID_SL_SORT_BYNAME:
      case WID_SL_SORT_BYDATE:
        if (((_savegame_sort_order & SORT_BY_NAME) != 0) == (widget == WID_SL_SORT_BYNAME)) {
          this->DrawSortButtonState(widget, _savegame_sort_order & SORT_DESCENDING ? SBS_DOWN : SBS_UP);
        }
        break;
 
      case WID_SL_BACKGROUND: {
        static const char *path = nullptr;
        static StringID str = STR_ERROR_UNABLE_TO_READ_DRIVE;
        static uint64 tot = 0;
 
        if (_fios_path_changed) {
          str = FiosGetDescText(&path, &tot);
          _fios_path_changed = false;
        }
 
        if (str != STR_ERROR_UNABLE_TO_READ_DRIVE) SetDParam(0, tot);
        DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP, str);
        DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, r.top + WD_FRAMERECT_TOP, path, TC_BLACK);
        break;
      }
 
      case WID_SL_DRIVES_DIRECTORIES_LIST: {
        GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.bottom - 1, PC_BLACK);
 
        uint y = r.top + WD_FRAMERECT_TOP;
        uint scroll_pos = this->vscroll->GetPosition();
        for (uint row = 0; row < this->fios_items.size(); row++) {
          if (!this->fios_items_shown[row]) {
            /* The current item is filtered out : we do not show it */
            scroll_pos++;
            continue;
          }
          if (row < scroll_pos) continue;
          const FiosItem *item = &this->fios_items[row];
 
          if (item == this->selected) {
            GfxFillRect(r.left + 1, y, r.right - 1, y + this->resize.step_height - 1, PC_DARK_BLUE);
          } else if (item == this->highlighted) {
            GfxFillRect(r.left + 1, y, r.right - 1, y + this->resize.step_height - 1, PC_VERY_DARK_BLUE);
          }
          DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, item->title, _fios_colours[GetDetailedFileType(item->type)]);
          y += this->resize.step_height;
          if (y >= this->vscroll->GetCapacity() * this->resize.step_height + r.top + WD_FRAMERECT_TOP) break;
        }
        break;
      }
 
      case WID_SL_DETAILS: {
        GfxFillRect(r.left + 1, r.top + 1, r.right - 1, r.top + FONT_HEIGHT_NORMAL * 2 + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM, PC_GREY);
        DrawString(r.left, r.right, r.top + FONT_HEIGHT_NORMAL / 2 + WD_FRAMERECT_TOP, STR_SAVELOAD_DETAIL_CAPTION, TC_FROMSTRING, SA_HOR_CENTER);
 
        if (this->selected == nullptr) break;
 
        uint y = r.top + FONT_HEIGHT_NORMAL * 2 + WD_PAR_VSEP_NORMAL + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
        uint y_max = r.bottom - FONT_HEIGHT_NORMAL - WD_FRAMERECT_BOTTOM;
 
        if (y > y_max) break;
        if (!_load_check_data.checkable) {
          /* Old savegame, no information available */
          DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_SAVELOAD_DETAIL_NOT_AVAILABLE);
          y += FONT_HEIGHT_NORMAL;
        } else if (_load_check_data.error != INVALID_STRING_ID) {
          /* Incompatible / broken savegame */
          SetDParamStr(0, _load_check_data.error_data);
          y = DrawStringMultiLine(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT,
              y, r.bottom - WD_FRAMERECT_BOTTOM, _load_check_data.error, TC_RED);
        } else {
          /* Mapsize */
          SetDParam(0, _load_check_data.map_size_x);
          SetDParam(1, _load_check_data.map_size_y);
          DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_NETWORK_SERVER_LIST_MAP_SIZE);
          y += FONT_HEIGHT_NORMAL;
          if (y > y_max) break;
 
          /* Climate */
          byte landscape = _load_check_data.settings.game_creation.landscape;
          if (landscape < NUM_LANDSCAPE) {
            SetDParam(0, STR_CHEAT_SWITCH_CLIMATE_TEMPERATE_LANDSCAPE + landscape);
            DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_NETWORK_SERVER_LIST_LANDSCAPE);
            y += FONT_HEIGHT_NORMAL;
          }
 
          y += WD_PAR_VSEP_NORMAL;
          if (y > y_max) break;
 
          /* Start date (if available) */
          if (_load_check_data.settings.game_creation.starting_year != 0) {
            SetDParam(0, ConvertYMDToDate(_load_check_data.settings.game_creation.starting_year, 0, 1));
            DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_NETWORK_SERVER_LIST_START_DATE);
            y += FONT_HEIGHT_NORMAL;
          }
          if (y > y_max) break;
 
          /* Hide current date for scenarios */
          if (this->abstract_filetype != FT_SCENARIO) {
            /* Current date */
            SetDParam(0, _load_check_data.current_date);
            DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_NETWORK_SERVER_LIST_CURRENT_DATE);
            y += FONT_HEIGHT_NORMAL;
          }
 
          /* Hide the NewGRF stuff when saving. We also hide the button. */
          if (this->fop == SLO_LOAD && (this->abstract_filetype == FT_SAVEGAME || this->abstract_filetype == FT_SCENARIO)) {
            y += WD_PAR_VSEP_NORMAL;
            if (y > y_max) break;
 
            /* NewGrf compatibility */
            SetDParam(0, _load_check_data.grfconfig == nullptr ? STR_NEWGRF_LIST_NONE :
                STR_NEWGRF_LIST_ALL_FOUND + _load_check_data.grf_compatibility);
            DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_SAVELOAD_DETAIL_GRFSTATUS);
            y += FONT_HEIGHT_NORMAL;
          }
          if (y > y_max) break;
 
          /* Hide the company stuff for scenarios */
          if (this->abstract_filetype != FT_SCENARIO) {
            y += FONT_HEIGHT_NORMAL;
            if (y > y_max) break;
 
            /* Companies / AIs */
            for (auto &pair : _load_check_data.companies) {
              SetDParam(0, pair.first + 1);
              const CompanyProperties &c = *pair.second;
              if (!c.name.empty()) {
                SetDParam(1, STR_JUST_RAW_STRING);
                SetDParamStr(2, c.name);
              } else {
                SetDParam(1, c.name_1);
                SetDParam(2, c.name_2);
              }
              DrawString(r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_SAVELOAD_DETAIL_COMPANY_INDEX);
              y += FONT_HEIGHT_NORMAL;
              if (y > y_max) break;
            }
          }
        }
        break;
      }
    }
  }
 
  void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
  {
    switch (widget) {
      case WID_SL_BACKGROUND:
        size->height = 2 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
        break;
 
      case WID_SL_DRIVES_DIRECTORIES_LIST:
        resize->height = FONT_HEIGHT_NORMAL;
        size->height = resize->height * 10 + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
        break;
      case WID_SL_SORT_BYNAME:
      case WID_SL_SORT_BYDATE: {
        Dimension d = GetStringBoundingBox(this->GetWidget<NWidgetCore>(widget)->widget_data);
        d.width += padding.width + Window::SortButtonWidth() * 2; // Doubled since the string is centred and it also looks better.
        d.height += padding.height;
        *size = maxdim(*size, d);
        break;
      }
    }
  }
 
  void OnPaint() override
  {
    if (_savegame_sort_dirty) {
      _savegame_sort_dirty = false;
      SortSaveGameList(this->fios_items);
      this->OnInvalidateData(SLIWD_FILTER_CHANGES);
    }
 
    this->DrawWidgets();
  }
 
  void OnClick(Point pt, int widget, int click_count) override
  {
    switch (widget) {
      case WID_SL_SORT_BYNAME: // Sort save names by name
        _savegame_sort_order = (_savegame_sort_order == SORT_BY_NAME) ?
          SORT_BY_NAME | SORT_DESCENDING : SORT_BY_NAME;
        _savegame_sort_dirty = true;
        this->SetDirty();
        break;
 
      case WID_SL_SORT_BYDATE: // Sort save names by date
        _savegame_sort_order = (_savegame_sort_order == SORT_BY_DATE) ?
          SORT_BY_DATE | SORT_DESCENDING : SORT_BY_DATE;
        _savegame_sort_dirty = true;
        this->SetDirty();
        break;
 
      case WID_SL_HOME_BUTTON: // OpenTTD 'button', jumps to OpenTTD directory
        FiosBrowseTo(&o_dir);
        this->InvalidateData(SLIWD_RESCAN_FILES);
        break;
 
      case WID_SL_LOAD_BUTTON: {
        if (this->selected == nullptr || _load_check_data.HasErrors()) break;
 
        const char *name = FiosBrowseTo(this->selected);
        _file_to_saveload.SetMode(this->selected->type);
        _file_to_saveload.SetName(name);
        _file_to_saveload.SetTitle(this->selected->title);
 
        if (this->abstract_filetype == FT_HEIGHTMAP) {
          this->Close();
          ShowHeightmapLoad();
        } else if (!_load_check_data.HasNewGrfs() || _load_check_data.grf_compatibility != GLC_NOT_FOUND || _settings_client.gui.UserIsAllowedToChangeNewGRFs()) {
          _switch_mode = (_game_mode == GM_EDITOR) ? SM_LOAD_SCENARIO : SM_LOAD_GAME;
          ClearErrorMessages();
          this->Close();
        }
        break;
      }
 
      case WID_SL_NEWGRF_INFO:
        if (_load_check_data.HasNewGrfs()) {
          ShowNewGRFSettings(false, false, false, &_load_check_data.grfconfig);
        }
        break;
 
      case WID_SL_MISSING_NEWGRFS:
        if (!_network_available) {
          ShowErrorMessage(STR_NETWORK_ERROR_NOTAVAILABLE, INVALID_STRING_ID, WL_ERROR);
        } else if (_load_check_data.HasNewGrfs()) {
          ShowMissingContentWindow(_load_check_data.grfconfig);
        }
        break;
 
      case WID_SL_DRIVES_DIRECTORIES_LIST: { // Click the listbox
        int y = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_SL_DRIVES_DIRECTORIES_LIST, WD_FRAMERECT_TOP);
        if (y == INT_MAX) return;
 
        /* Get the corresponding non-filtered out item from the list */
        int i = 0;
        while (i <= y) {
          if (!this->fios_items_shown[i]) y++;
          i++;
        }
        const FiosItem *file = &this->fios_items[y];
 
        const char *name = FiosBrowseTo(file);
        if (name == nullptr) {
          /* Changed directory, need refresh. */
          this->InvalidateData(SLIWD_RESCAN_FILES);
          break;
        }
 
        if (click_count == 1) {
          if (this->selected != file) {
            this->selected = file;
            _load_check_data.Clear();
 
            if (GetDetailedFileType(file->type) == DFT_GAME_FILE) {
              /* Other detailed file types cannot be checked before. */
              SaveOrLoad(name, SLO_CHECK, DFT_GAME_FILE, NO_DIRECTORY, false);
            }
 
            this->InvalidateData(SLIWD_SELECTION_CHANGES);
          }
          if (this->fop == SLO_SAVE) {
            /* Copy clicked name to editbox */
            this->filename_editbox.text.Assign(file->title);
            this->SetWidgetDirty(WID_SL_SAVE_OSK_TITLE);
          }
        } else if (!_load_check_data.HasErrors()) {
          this->selected = file;
          if (this->fop == SLO_LOAD) {
            if (this->abstract_filetype == FT_SAVEGAME || this->abstract_filetype == FT_SCENARIO) {
              this->OnClick(pt, WID_SL_LOAD_BUTTON, 1);
            } else {
              assert(this->abstract_filetype == FT_HEIGHTMAP);
              _file_to_saveload.SetMode(file->type);
              _file_to_saveload.SetName(name);
              _file_to_saveload.SetTitle(file->title);
 
              this->Close();
              ShowHeightmapLoad();
            }
          }
        }
        break;
      }
 
      case WID_SL_CONTENT_DOWNLOAD:
        if (!_network_available) {
          ShowErrorMessage(STR_NETWORK_ERROR_NOTAVAILABLE, INVALID_STRING_ID, WL_ERROR);
        } else {
          assert(this->fop == SLO_LOAD);
          switch (this->abstract_filetype) {
            default: NOT_REACHED();
            case FT_SCENARIO:  ShowNetworkContentListWindow(nullptr, CONTENT_TYPE_SCENARIO);  break;
            case FT_HEIGHTMAP: ShowNetworkContentListWindow(nullptr, CONTENT_TYPE_HEIGHTMAP); break;
          }
        }
        break;
 
      case WID_SL_DELETE_SELECTION: // Delete
        break;
 
      case WID_SL_SAVE_GAME: // Save game
        /* Note, this is also called via the OSK; and we need to lower the button. */
        this->HandleButtonClick(WID_SL_SAVE_GAME);
        break;
    }
  }
 
  void OnMouseOver(Point pt, int widget) override
  {
    if (widget == WID_SL_DRIVES_DIRECTORIES_LIST) {
      int y = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_SL_DRIVES_DIRECTORIES_LIST, WD_FRAMERECT_TOP);
      if (y == INT_MAX) return;
 
      /* Get the corresponding non-filtered out item from the list */
      int i = 0;
      while (i <= y) {
        if (!this->fios_items_shown[i]) y++;
        i++;
      }
      const FiosItem *file = &this->fios_items[y];
 
      if (file != this->highlighted) {
        this->highlighted = file;
        this->SetWidgetDirty(WID_SL_DRIVES_DIRECTORIES_LIST);
      }
    } else if (this->highlighted != nullptr) {
      this->highlighted = nullptr;
      this->SetWidgetDirty(WID_SL_DRIVES_DIRECTORIES_LIST);
    }
  }
 
  EventState OnKeyPress(WChar key, uint16 keycode) override
  {
    if (keycode == WKC_ESC) {
      this->Close();
      return ES_HANDLED;
    }
 
    return ES_NOT_HANDLED;
  }
 
  void OnTimeout() override
  {
    /* Widgets WID_SL_DELETE_SELECTION and WID_SL_SAVE_GAME only exist when saving to a file. */
    if (this->fop != SLO_SAVE) return;
 
    if (this->IsWidgetLowered(WID_SL_DELETE_SELECTION)) { // Delete button clicked
      if (!FiosDelete(this->filename_editbox.text.buf)) {
        ShowErrorMessage(STR_ERROR_UNABLE_TO_DELETE_FILE, INVALID_STRING_ID, WL_ERROR);
      } else {
        this->InvalidateData(SLIWD_RESCAN_FILES);
        /* Reset file name to current date on successful delete */
        if (this->abstract_filetype == FT_SAVEGAME) GenerateFileName();
      }
    } else if (this->IsWidgetLowered(WID_SL_SAVE_GAME)) { // Save button clicked
      if (this->abstract_filetype == FT_SAVEGAME || this->abstract_filetype == FT_SCENARIO) {
        _file_to_saveload.name = FiosMakeSavegameName(this->filename_editbox.text.buf);
        if (FioCheckFileExists(_file_to_saveload.name, Subdirectory::SAVE_DIR)) {
          ShowQuery(STR_SAVELOAD_OVERWRITE_TITLE, STR_SAVELOAD_OVERWRITE_WARNING, this, SaveLoadWindow::SaveGameConfirmationCallback);
        } else {
          _switch_mode = SM_SAVE_GAME;
        }
      } else {
        _file_to_saveload.name = FiosMakeHeightmapName(this->filename_editbox.text.buf);
        if (FioCheckFileExists(_file_to_saveload.name, Subdirectory::SAVE_DIR)) {
          ShowQuery(STR_SAVELOAD_OVERWRITE_TITLE, STR_SAVELOAD_OVERWRITE_WARNING, this, SaveLoadWindow::SaveHeightmapConfirmationCallback);
        } else {
          _switch_mode = SM_SAVE_HEIGHTMAP;
        }
      }
 
      /* In the editor set up the vehicle engines correctly (date might have changed) */
      if (_game_mode == GM_EDITOR) StartupEngines();
    }
  }
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_SL_DRIVES_DIRECTORIES_LIST);
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    switch (data) {
      case SLIWD_RESCAN_FILES:
        /* Rescan files */
        this->selected = nullptr;
        _load_check_data.Clear();
        if (!gui_scope) break;
 
        _fios_path_changed = true;
        this->fios_items.BuildFileList(this->abstract_filetype, this->fop);
        this->vscroll->SetCount((uint)this->fios_items.size());
        this->selected = nullptr;
        _load_check_data.Clear();
 
        /* We reset the files filtered */
        this->OnInvalidateData(SLIWD_FILTER_CHANGES);
 
        FALLTHROUGH;
 
      case SLIWD_SELECTION_CHANGES:
        /* Selection changes */
        if (!gui_scope) break;
 
        if (this->fop != SLO_LOAD) break;
 
        switch (this->abstract_filetype) {
          case FT_HEIGHTMAP:
            this->SetWidgetDisabledState(WID_SL_LOAD_BUTTON, this->selected == nullptr || _load_check_data.HasErrors());
            break;
 
          case FT_SAVEGAME:
          case FT_SCENARIO: {
            bool disabled = this->selected == nullptr || _load_check_data.HasErrors();
            if (!_settings_client.gui.UserIsAllowedToChangeNewGRFs()) {
              disabled |= _load_check_data.HasNewGrfs() && _load_check_data.grf_compatibility == GLC_NOT_FOUND;
            }
            this->SetWidgetDisabledState(WID_SL_LOAD_BUTTON, disabled);
            this->SetWidgetDisabledState(WID_SL_NEWGRF_INFO, !_load_check_data.HasNewGrfs());
            this->SetWidgetDisabledState(WID_SL_MISSING_NEWGRFS,
                !_load_check_data.HasNewGrfs() || _load_check_data.grf_compatibility == GLC_ALL_GOOD);
            break;
          }
 
          default:
            NOT_REACHED();
        }
        break;
 
      case SLIWD_FILTER_CHANGES:
        /* Filter changes */
        this->fios_items_shown.resize(this->fios_items.size());
        uint items_shown_count = 0; 
        /* We pass through every fios item */
        for (uint i = 0; i < this->fios_items.size(); i++) {
          if (this->string_filter.IsEmpty()) {
            /* We don't filter anything out if the filter editbox is empty */
            this->fios_items_shown[i] = true;
            items_shown_count++;
          } else {
            this->string_filter.ResetState();
            this->string_filter.AddLine(this->fios_items[i].title);
            /* We set the vector to show this fios element as filtered depending on the result of the filter */
            this->fios_items_shown[i] = this->string_filter.GetState();
            if (this->fios_items_shown[i]) items_shown_count++;
 
            if (&(this->fios_items[i]) == this->selected && !this->fios_items_shown[i]) {
              /* The selected element has been filtered out */
              this->selected = nullptr;
              this->OnInvalidateData(SLIWD_SELECTION_CHANGES);
            }
          }
        }
        this->vscroll->SetCount(items_shown_count);
        break;
    }
  }
 
  void OnEditboxChanged(int wid) override
  {
    if (wid == WID_SL_FILTER) {
      this->string_filter.SetFilterTerm(this->filter_editbox.text.buf);
      this->InvalidateData(SLIWD_FILTER_CHANGES);
    }
  }
};
 
static WindowDesc _load_dialog_desc(
  WDP_CENTER, "load_game", 500, 294,
  WC_SAVELOAD, WC_NONE,
  0,
  _nested_load_dialog_widgets, lengthof(_nested_load_dialog_widgets)
);
 
static WindowDesc _load_heightmap_dialog_desc(
  WDP_CENTER, "load_heightmap", 257, 320,
  WC_SAVELOAD, WC_NONE,
  0,
  _nested_load_heightmap_dialog_widgets, lengthof(_nested_load_heightmap_dialog_widgets)
);
 
static WindowDesc _save_dialog_desc(
  WDP_CENTER, "save_game", 500, 294,
  WC_SAVELOAD, WC_NONE,
  0,
  _nested_save_dialog_widgets, lengthof(_nested_save_dialog_widgets)
);
 
void ShowSaveLoadDialog(AbstractFileType abstract_filetype, SaveLoadOperation fop)
{
  CloseWindowById(WC_SAVELOAD, 0);
 
  WindowDesc *sld;
  if (fop == SLO_SAVE) {
    sld = &_save_dialog_desc;
  } else {
    /* Dialogue for loading a file. */
    sld = (abstract_filetype == FT_HEIGHTMAP) ? &_load_heightmap_dialog_desc : &_load_dialog_desc;
  }
 
  new SaveLoadWindow(sld, abstract_filetype, fop);
}