signs_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 <https://www.gnu.org/licenses/old-licenses/gpl-2.0>.
 */

 
#include "stdafx.h"
#include "company_gui.h"
#include "company_func.h"
#include "signs_base.h"
#include "signs_func.h"
#include "debug.h"
#include "command_func.h"
#include "strings_func.h"
#include "window_func.h"
#include "map_func.h"
#include "viewport_func.h"
#include "querystring_gui.h"
#include "sortlist_type.h"
#include "tilehighlight_func.h"
#include "stringfilter_type.h"
#include "string_func.h"
#include "core/geometry_func.hpp"
#include "hotkeys.h"
#include "transparency.h"
#include "gui.h"
#include "signs_cmd.h"
#include "timer/timer.h"
#include "timer/timer_window.h"
#include "dropdown_common_type.h"
#include "dropdown_func.h"
 
#include "widgets/sign_widget.h"
 
#include "table/strings.h"
#include "table/sprites.h"
 
#include "safeguards.h"
 
struct SignList {
  typedef GUIList<const Sign *, std::nullptr_t, StringFilter &> GUISignList;
 
  GUISignList signs;
 
  StringFilter string_filter;                                       
  static bool match_case;                                           
  static std::string default_name;                                  

  SignList() : string_filter(&match_case)
  {
  }
 
  void BuildSignsList()
  {
    if (!this->signs.NeedRebuild()) return;
 
    Debug(misc, 3, "Building sign list");
 
    this->signs.clear();
    this->signs.reserve(Sign::GetNumItems());
 
    for (const Sign *si : Sign::Iterate()) this->signs.push_back(si);
 
    this->signs.SetFilterState(true);
    this->FilterSignList();
    this->signs.RebuildDone();
  }

  static bool SignNameSorter(const Sign * const &a, const Sign * const &b)
  {
    /* Signs are very very rarely using the default text, but there can also be
     * a lot of them. Therefore a worthwhile performance gain can be made by
     * directly comparing Sign::name instead of going through the string
     * system for each comparison. */
    const std::string &a_name = a->name.empty() ? SignList::default_name : a->name;
    const std::string &b_name = b->name.empty() ? SignList::default_name : b->name;
 
    int r = StrNaturalCompare(a_name, b_name); // Sort by name (natural sorting).
 
    return r != 0 ? r < 0 : (a->index < b->index);
  }
 
  void SortSignsList()
  {
    if (!this->signs.Sort(&SignNameSorter)) return;
  }

  static bool SignNameFilter(const Sign * const *item, StringFilter &filter)
  {
    /* Same performance benefit as above for sorting. */
    const std::string_view name = (*item)->name.empty() ? SignList::default_name : (*item)->name;
 
    filter.ResetState();
    filter.AddLine(name);
    return filter.GetState();
  }

  static bool OwnerDeityFilter(const Sign * const *item, [[maybe_unused]] StringFilter &filter)
  {
    /* You should never be able to edit signs of owner DEITY */
    return (*item)->owner != OWNER_DEITY;
  }

  static bool OwnerVisibilityFilter(const Sign * const *item, [[maybe_unused]] StringFilter &filter)
  {
    assert(!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS));
    /* Hide sign if non-own signs are hidden in the viewport */
    return (*item)->owner == _local_company || (*item)->owner == OWNER_DEITY;
  }

  void FilterSignList()
  {
    this->signs.Filter(&SignNameFilter, this->string_filter);
    if (_game_mode != GM_EDITOR) this->signs.Filter(&OwnerDeityFilter, this->string_filter);
    if (!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS)) {
      this->signs.Filter(&OwnerVisibilityFilter, this->string_filter);
    }
  }
};
 
bool SignList::match_case = false;
std::string SignList::default_name;
 
struct SignListWindow : Window, SignList {
  QueryString filter_editbox; 
  int text_offset = 0; 
  Scrollbar *vscroll = nullptr;
 
  SignListWindow(WindowDesc &desc, WindowNumber window_number) : Window(desc), filter_editbox(MAX_LENGTH_SIGN_NAME_CHARS * MAX_CHAR_LENGTH, MAX_LENGTH_SIGN_NAME_CHARS)
  {
    this->CreateNestedTree();
    this->vscroll = this->GetScrollbar(WID_SIL_SCROLLBAR);
    this->FinishInitNested(window_number);
    this->SetWidgetLoweredState(WID_SIL_FILTER_MATCH_CASE_BTN, SignList::match_case);
 
    /* Initialize the text edit widget */
    this->querystrings[WID_SIL_FILTER_TEXT] = &this->filter_editbox;
    this->filter_editbox.cancel_button = QueryString::ACTION_CLEAR;
 
    /* Initialize the filtering variables */
    this->SetFilterString("");
 
    /* Create initial list. */
    this->signs.ForceRebuild();
    this->signs.ForceResort();
    this->BuildSortSignList();
  }
 
  void OnInit() override
  {
    /* Default sign name, used if Sign::name is nullptr. */
    SignList::default_name = GetString(STR_DEFAULT_SIGN_NAME);
    this->signs.ForceResort();
    this->SortSignsList();
    this->SetDirty();
  }

  void SetFilterString(std::string_view new_filter_string)
  {
    /* check if there is a new filter string */
    this->string_filter.SetFilterTerm(new_filter_string);
 
    /* Rebuild the list of signs */
    this->InvalidateData();
  }
 
  void OnPaint() override
  {
    if (!this->IsShaded() && this->signs.NeedRebuild()) this->BuildSortSignList();
    this->DrawWidgets();
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_SIL_LIST: {
        Rect tr = r.Shrink(WidgetDimensions::scaled.framerect);
        uint text_offset_y = (this->resize.step_height - GetCharacterHeight(FS_NORMAL) + 1) / 2;
        /* No signs? */
        if (this->vscroll->GetCount() == 0) {
          DrawString(tr.left, tr.right, tr.top + text_offset_y, STR_STATION_LIST_NONE);
          return;
        }
 
        Dimension d = GetSpriteSize(SPR_COMPANY_ICON);
        bool rtl = _current_text_dir == TD_RTL;
        int sprite_offset_y = (this->resize.step_height - d.height + 1) / 2;
        uint icon_left = rtl ? tr.right - this->text_offset : tr.left;
        tr = tr.Indent(this->text_offset, rtl);
 
        /* At least one sign available. */
        auto [first, last] = this->vscroll->GetVisibleRangeIterators(this->signs);
        for (auto it = first; it != last; ++it) {
          const Sign *si = *it;
 
          if (si->owner != OWNER_NONE) DrawCompanyIcon(si->owner, icon_left, tr.top + sprite_offset_y);
 
          DrawString(tr.left, tr.right, tr.top + text_offset_y, GetString(STR_SIGN_NAME, si->index), TC_YELLOW);
          tr.top += this->resize.step_height;
        }
        break;
      }
    }
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    if (widget == WID_SIL_CAPTION) return GetString(STR_SIGN_LIST_CAPTION, this->vscroll->GetCount());
 
    return this->Window::GetWidgetString(widget, stringid);
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_SIL_LIST: {
        auto it = this->vscroll->GetScrolledItemFromWidget(this->signs, pt.y, this, WID_SIL_LIST, WidgetDimensions::scaled.framerect.top);
        if (it == this->signs.end()) return;
 
        const Sign *si = *it;
        ScrollMainWindowToTile(TileVirtXY(si->x, si->y));
        break;
      }
 
      case WID_SIL_FILTER_MATCH_CASE_BTN:
        SignList::match_case = !SignList::match_case; // Toggle match case
        this->SetWidgetLoweredState(WID_SIL_FILTER_MATCH_CASE_BTN, SignList::match_case); // Toggle button pushed state
        this->InvalidateData(); // Rebuild the list of signs
        break;
    }
  }
 
  void OnResize() override
  {
    this->vscroll->SetCapacityFromWidget(this, WID_SIL_LIST, WidgetDimensions::scaled.framerect.Vertical());
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, [[maybe_unused]] const Dimension &padding, [[maybe_unused]] Dimension &fill, [[maybe_unused]] Dimension &resize) override
  {
    switch (widget) {
      case WID_SIL_LIST: {
        Dimension spr_dim = GetSpriteSize(SPR_COMPANY_ICON);
        this->text_offset = WidgetDimensions::scaled.frametext.left + spr_dim.width + 2; // 2 pixels space between icon and the sign text.
        fill.height = resize.height = std::max<uint>(GetCharacterHeight(FS_NORMAL), spr_dim.height + 2);
        Dimension d = {(uint)(this->text_offset + WidgetDimensions::scaled.frametext.right), padding.height + 5 * resize.height};
        size = maxdim(size, d);
        break;
      }
 
      case WID_SIL_CAPTION:
        size = GetStringBoundingBox(GetString(STR_SIGN_LIST_CAPTION, GetParamMaxValue(Sign::GetPoolSize(), 3)));
        size.height += padding.height;
        size.width  += padding.width;
        break;
    }
  }
 
  void OnEditboxChanged(WidgetID widget) override
  {
    if (widget == WID_SIL_FILTER_TEXT) this->SetFilterString(this->filter_editbox.text.GetText());
  }
 
  void BuildSortSignList()
  {
    if (this->signs.NeedRebuild()) {
      this->BuildSignsList();
      this->vscroll->SetCount(this->signs.size());
      this->SetWidgetDirty(WID_SIL_CAPTION);
    }
    this->SortSignsList();
  }

  const IntervalTimer<TimerWindow> rebuild_interval = {std::chrono::seconds(3), [this](auto) {
    this->BuildSortSignList();
    this->SetDirty();
  }};

  void OnInvalidateData([[maybe_unused]] int data = 0, [[maybe_unused]] bool gui_scope = true) override
  {
    /* When there is a filter string, we always need to rebuild the list even if
     * the amount of signs in total is unchanged, as the subset of signs that is
     * accepted by the filter might has changed. */
    if (data == 0 || data == -1 || !this->string_filter.IsEmpty()) { // New or deleted sign, changed visibility setting or there is a filter string
      /* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
      this->signs.ForceRebuild();
    } else { // Change of sign contents while there is no filter string
      this->signs.ForceResort();
    }
  }

  static EventState SignListGlobalHotkeys(int hotkey)
  {
    if (_game_mode == GM_MENU) return ES_NOT_HANDLED;
    Window *w = ShowSignList();
    if (w == nullptr) return ES_NOT_HANDLED;
    return w->OnHotkey(hotkey);
  }
 
  static inline HotkeyList hotkeys{"signlist", {
    Hotkey('F', "focus_filter_box", WID_SIL_FILTER_TEXT),
  }, SignListGlobalHotkeys};
};
 
static constexpr std::initializer_list<NWidgetPart> _nested_sign_list_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_SIL_CAPTION),
    NWidget(WWT_SHADEBOX, COLOUR_BROWN),
    NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
    NWidget(WWT_STICKYBOX, COLOUR_BROWN),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_VERTICAL),
      NWidget(WWT_PANEL, COLOUR_BROWN, WID_SIL_LIST), SetMinimalSize(WidgetDimensions::unscaled.frametext.Horizontal() + 16 + 255, 0),
                SetResize(1, 1), SetFill(1, 0), SetScrollbar(WID_SIL_SCROLLBAR), EndContainer(),
      NWidget(NWID_HORIZONTAL),
        NWidget(WWT_PANEL, COLOUR_BROWN), SetFill(1, 1),
          NWidget(WWT_EDITBOX, COLOUR_BROWN, WID_SIL_FILTER_TEXT), SetMinimalSize(80, 0), SetResize(1, 0), SetFill(1, 0), SetPadding(2, 2, 2, 2),
              SetStringTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
        EndContainer(),
        NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_SIL_FILTER_MATCH_CASE_BTN), SetStringTip(STR_SIGN_LIST_MATCH_CASE, STR_SIGN_LIST_MATCH_CASE_TOOLTIP),
      EndContainer(),
    EndContainer(),
    NWidget(NWID_VERTICAL),
      NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_SIL_SCROLLBAR),
      NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
    EndContainer(),
  EndContainer(),
};
 
static WindowDesc _sign_list_desc(
  WDP_AUTO, "list_signs", 358, 138,
  WC_SIGN_LIST, WC_NONE,
  {},
  _nested_sign_list_widgets,
  &SignListWindow::hotkeys
);

Window *ShowSignList()
{
  return AllocateWindowDescFront<SignListWindow>(_sign_list_desc, 0);
}

static bool RenameSign(SignID index, std::string_view text, Colours text_colour)
{
  bool remove = text.empty();
  Command<Commands::RenameSign>::Post(remove ? STR_ERROR_CAN_T_DELETE_SIGN : STR_ERROR_CAN_T_CHANGE_SIGN_NAME, index, std::string{text}, text_colour);
  return remove;
}

void MoveSign(SignID index, TileIndex tile)
{
  Command<Commands::MoveSign>::Post(STR_ERROR_CAN_T_PLACE_SIGN_HERE, index, tile);
}
 
struct SignWindow : Window, SignList {
  QueryString name_editbox;
  SignID cur_sign{};
  WidgetID last_user_action = INVALID_WIDGET; 
  std::optional<Colours> new_colour; 
 
  SignWindow(WindowDesc &desc, const Sign *si) : Window(desc), name_editbox(MAX_LENGTH_SIGN_NAME_CHARS * MAX_CHAR_LENGTH, MAX_LENGTH_SIGN_NAME_CHARS), cur_sign(si->index)
  {
    this->querystrings[WID_QES_TEXT] = &this->name_editbox;
    this->name_editbox.caption = STR_EDIT_SIGN_CAPTION;
    this->name_editbox.cancel_button = WID_QES_CANCEL;
    this->name_editbox.ok_button = WID_QES_OK;
 
    this->InitNested(WN_QUERY_STRING_SIGN);
 
    if (_game_mode != GameMode::GM_EDITOR) {
      this->GetWidget<NWidgetStacked>(WID_QES_COLOUR_PANE)->SetDisplayedPlane(SZSP_VERTICAL);
      this->ReInit();
    }
 
    UpdateSignEditWindow(si);
    this->SetFocusedWidget(WID_QES_TEXT);
  }
 
  void UpdateSignEditWindow(const Sign *si)
  {
    /* Display an empty string when the sign hasn't been edited yet */
    if (!si->name.empty()) {
      this->name_editbox.text.Assign(GetString(STR_SIGN_NAME, si->index));
    } else {
      this->name_editbox.text.DeleteAll();
    }
 
    this->cur_sign = si->index;
    this->new_colour.reset();
 
    this->SetWidgetDirty(WID_QES_TEXT);
    this->SetWidgetDirty(WID_QES_COLOUR);
    this->SetFocusedWidget(WID_QES_TEXT);
  }

  const Sign *PrevNextSign(bool next)
  {
    /* Rebuild the sign list */
    this->signs.ForceRebuild();
    this->signs.NeedResort();
    this->BuildSignsList();
    this->SortSignsList();
 
    /* Search through the list for the current sign, excluding
     * - the first sign if we want the previous sign or
     * - the last sign if we want the next sign */
    size_t end = this->signs.size() - (next ? 1 : 0);
    for (uint i = next ? 0 : 1; i < end; i++) {
      if (this->cur_sign == this->signs[i]->index) {
        /* We've found the current sign, so return the sign before/after it */
        return this->signs[i + (next ? 1 : -1)];
      }
    }
    /* If we haven't found the current sign by now, return the last/first sign */
    return next ? this->signs.front() : this->signs.back();
  }
 
  std::string GetWidgetString(WidgetID widget, StringID stringid) const override
  {
    switch (widget) {
      case WID_QES_CAPTION:
        return GetString(this->name_editbox.caption);
 
      case WID_QES_COLOUR:
        return GetString(STR_COLOUR_DARK_BLUE + this->new_colour.value_or(Sign::Get(this->cur_sign)->text_colour));
 
      default:
        return this->Window::GetWidgetString(widget, stringid);
    }
  }
 
  void UpdateWidgetSize(WidgetID widget, Dimension &size, const Dimension &padding, Dimension &fill, Dimension &resize) override
  {
    if (widget == WID_QES_COLOUR) {
      const Dimension square_size = GetSpriteSize(SPR_SQUARE);
      const uint string_padding = square_size.width + WidgetDimensions::scaled.hsep_normal + padding.width;
      for (Colours colour = COLOUR_BEGIN; colour != COLOUR_END; ++colour) {
        size.width = std::max(size.width, GetStringBoundingBox(STR_COLOUR_DARK_BLUE + colour).width + string_padding);
      }
      size.width = std::max(size.width, GetStringBoundingBox(STR_COLOUR_DEFAULT).width + string_padding);
      return;
    }
 
    Window::UpdateWidgetSize(widget, size, padding, fill, resize);
  }
 
  void ShowColourDropDownMenu()
  {
    DropDownList list;
    for (Colours colour = COLOUR_BEGIN; colour != COLOUR_END; ++colour) {
      list.emplace_back(MakeDropDownListIconItem(SPR_SQUARE, GetColourPalette(colour), STR_COLOUR_DARK_BLUE + colour, colour));
    }
    const int selected = this->new_colour.value_or(Sign::Get(this->cur_sign)->text_colour);
    ShowDropDownList(this, std::move(list), selected, WID_QES_COLOUR);
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_QES_COLOUR: {
        ShowColourDropDownMenu();
        break;
      }
 
      case WID_QES_LOCATION: {
        const Sign *si = Sign::Get(this->cur_sign);
        TileIndex tile = TileVirtXY(si->x, si->y);
        if (_ctrl_pressed) {
          ShowExtraViewportWindow(tile);
        } else {
          ScrollMainWindowToTile(tile);
        }
        break;
      }
 
      case WID_QES_PREVIOUS:
      case WID_QES_NEXT: {
        const Sign *si = this->PrevNextSign(widget == WID_QES_NEXT);
 
        /* Rebuild the sign list */
        this->signs.ForceRebuild();
        this->signs.NeedResort();
        this->BuildSignsList();
        this->SortSignsList();
 
        /* Scroll to sign and reopen window */
        ScrollMainWindowToTile(TileVirtXY(si->x, si->y));
        UpdateSignEditWindow(si);
        break;
      }
 
      case WID_QES_OK:
        if (RenameSign(this->cur_sign, this->name_editbox.text.GetText(), this->new_colour.value_or(INVALID_COLOUR))) break;
        [[fallthrough]];
 
      case WID_QES_CANCEL:
        this->Close();
        break;
 
      case WID_QES_DELETE:
        /* Only need to set the buffer to null, the rest is handled as the OK button */
        RenameSign(this->cur_sign, "", INVALID_COLOUR);
        /* don't delete this, we are deleted in Sign::~Sign() -> DeleteRenameSignWindow() */
        break;
 
      case WID_QES_MOVE:
        HandlePlacePushButton(this, WID_QES_MOVE, SPR_CURSOR_SIGN, HT_RECT);
        this->last_user_action = widget;
        break;
    }
  }
 
  void OnPlaceObject([[maybe_unused]] Point pt, TileIndex tile) override
  {
    switch (this->last_user_action) {
      case WID_QES_MOVE: // Place sign button
        RenameSign(this->cur_sign, this->name_editbox.text.GetText(), this->new_colour.value_or(INVALID_COLOUR));
        MoveSign(this->cur_sign, tile);
        this->Close();
        break;
 
      default: NOT_REACHED();
    }
  }
 
  void OnPlaceObjectAbort() override
  {
    this->RaiseButtons();
  }
 
  void OnDropdownSelect(WidgetID widget, int index, int) override
  {
    if (widget == WID_QES_COLOUR) this->new_colour = static_cast<Colours>(index);
  }
};
 
static constexpr std::initializer_list<NWidgetPart> _nested_query_sign_edit_widgets = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_GREY),
    NWidget(WWT_CAPTION, COLOUR_GREY, WID_QES_CAPTION), SetTextStyle(TC_WHITE),
    NWidget(WWT_PUSHIMGBTN, COLOUR_GREY, WID_QES_LOCATION), SetAspect(WidgetDimensions::ASPECT_LOCATION), SetSpriteTip(SPR_GOTO_LOCATION, STR_EDIT_SIGN_LOCATION_TOOLTIP),
  EndContainer(),
  NWidget(WWT_PANEL, COLOUR_GREY),
    NWidget(WWT_EDITBOX, COLOUR_GREY, WID_QES_TEXT), SetMinimalSize(256, 0), SetStringTip(STR_EDIT_SIGN_SIGN_OSKTITLE), SetPadding(2, 2, 2, 2),
  EndContainer(),
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_QES_OK), SetMinimalSize(61, 12), SetStringTip(STR_BUTTON_OK),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_QES_CANCEL), SetMinimalSize(60, 12), SetStringTip(STR_BUTTON_CANCEL),
    NWidget(WWT_PUSHTXTBTN, COLOUR_GREY, WID_QES_DELETE), SetMinimalSize(60, 12), SetStringTip(STR_TOWN_VIEW_DELETE_BUTTON),
    NWidget(WWT_TEXTBTN, COLOUR_GREY, WID_QES_MOVE), SetMinimalSize(60, 12), SetStringTip(STR_BUTTON_MOVE),
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_QES_COLOUR_PANE),
      NWidget(WWT_DROPDOWN, COLOUR_GREY, WID_QES_COLOUR), SetMinimalSize(60, 12), SetToolTip(STR_EDIT_SIGN_TEXT_COLOUR_TOOLTIP),
    EndContainer(),
    NWidget(WWT_PANEL, COLOUR_GREY), SetFill(1, 1), EndContainer(),
    NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_QES_PREVIOUS), SetMinimalSize(11, 12), SetArrowWidgetTypeTip(AWV_DECREASE, STR_EDIT_SIGN_PREVIOUS_SIGN_TOOLTIP),
    NWidget(WWT_PUSHARROWBTN, COLOUR_GREY, WID_QES_NEXT), SetMinimalSize(11, 12), SetArrowWidgetTypeTip(AWV_INCREASE, STR_EDIT_SIGN_NEXT_SIGN_TOOLTIP),
  EndContainer(),
};
 
static WindowDesc _query_sign_edit_desc(
  WDP_CENTER, {}, 0, 0,
  WC_QUERY_STRING, WC_NONE,
  WindowDefaultFlag::Construction,
  _nested_query_sign_edit_widgets
);

void HandleClickOnSign(const Sign *si)
{
  /* If we can't edit the sign, don't even open the rename GUI. */
  if (!CompanyCanEditSign(si)) return;
 
  if (_ctrl_pressed && (si->owner == _local_company || (si->owner == OWNER_DEITY && _game_mode == GM_EDITOR))) {
    RenameSign(si->index, "", INVALID_COLOUR);
    return;
  }
 
  ShowRenameSignWindow(si);
}

void ShowRenameSignWindow(const Sign *si)
{
  /* Delete all other edit windows */
  CloseWindowByClass(WC_QUERY_STRING);
 
  new SignWindow(_query_sign_edit_desc, si);
}

void DeleteRenameSignWindow(SignID sign)
{
  SignWindow *w = dynamic_cast<SignWindow *>(FindWindowById(WC_QUERY_STRING, WN_QUERY_STRING_SIGN));
 
  if (w != nullptr && w->cur_sign == sign) w->Close();
}