picker_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 "core/backup_type.hpp"
#include "gui.h"
#include "hotkeys.h"
#include "ini_type.h"
#include "picker_gui.h"
#include "querystring_gui.h"
#include "settings_type.h"
#include "sortlist_type.h"
#include "sound_func.h"
#include "sound_type.h"
#include "string_func.h"
#include "stringfilter_type.h"
#include "strings_func.h"
#include "widget_type.h"
#include "window_func.h"
#include "window_gui.h"
#include "window_type.h"
#include "zoom_func.h"
 
#include "widgets/picker_widget.h"
 
#include "table/sprites.h"
 
#include <charconv>
 
#include "safeguards.h"
 
static std::vector<PickerCallbacks *> &GetPickerCallbacks()
{
  static std::vector<PickerCallbacks *> callbacks;
  return callbacks;
}
 
PickerCallbacks::PickerCallbacks(const std::string &ini_group) : ini_group(ini_group)
{
  GetPickerCallbacks().push_back(this);
}
 
PickerCallbacks::~PickerCallbacks()
{
  auto &callbacks = GetPickerCallbacks();
  callbacks.erase(std::find(callbacks.begin(), callbacks.end(), this));
}
 
static void PickerLoadConfig(const IniFile &ini, PickerCallbacks &callbacks)
{
  const IniGroup *group = ini.GetGroup(callbacks.ini_group);
  if (group == nullptr) return;
 
  callbacks.saved.clear();
  for (const IniItem &item : group->items) {
    std::array<uint8_t, 4> grfid_buf;
 
    std::string_view str = item.name;
 
    /* Try reading "<grfid>|<localid>" */
    auto grfid_pos = str.find('|');
    if (grfid_pos == std::string_view::npos) continue;
 
    std::string_view grfid_str = str.substr(0, grfid_pos);
    if (!ConvertHexToBytes(grfid_str, grfid_buf)) continue;
 
    str = str.substr(grfid_pos + 1);
    uint32_t grfid = grfid_buf[0] | (grfid_buf[1] << 8) | (grfid_buf[2] << 16) | (grfid_buf[3] << 24);
    uint16_t localid;
    auto [ptr, err] = std::from_chars(str.data(), str.data() + str.size(), localid);
 
    if (err == std::errc{} && ptr == str.data() + str.size()) {
      callbacks.saved.insert({grfid, localid, 0, 0});
    }
  }
}
 
static void PickerSaveConfig(IniFile &ini, const PickerCallbacks &callbacks)
{
  IniGroup &group = ini.GetOrCreateGroup(callbacks.ini_group);
  group.Clear();
 
  for (const PickerItem &item : callbacks.saved) {
    std::string key = fmt::format("{:08X}|{}", BSWAP32(item.grfid), item.local_id);
    group.CreateItem(key);
  }
}
 
void PickerLoadConfig(const IniFile &ini)
{
  for (auto *cb : GetPickerCallbacks()) PickerLoadConfig(ini, *cb);
}
 
void PickerSaveConfig(IniFile &ini)
{
  for (const auto *cb : GetPickerCallbacks()) PickerSaveConfig(ini, *cb);
}
 
static bool ClassIDSorter(int const &a, int const &b)
{
  return a < b;
}
 
static bool ClassTagNameFilter(int const *item, PickerFilterData &filter)
{
  filter.ResetState();
  filter.AddLine(GetString(filter.callbacks->GetClassName(*item)));
  return filter.GetState();
}
 
static bool TypeIDSorter(PickerItem const &a, PickerItem const &b)
{
  int r = a.class_index - b.class_index;
  if (r == 0) r = a.index - b.index;
  return r < 0;
}
 
static bool TypeTagNameFilter(PickerItem const *item, PickerFilterData &filter)
{
  filter.ResetState();
  filter.AddLine(GetString(filter.callbacks->GetTypeName(item->class_index, item->index)));
  return filter.GetState();
}
 
static const std::initializer_list<PickerClassList::SortFunction * const> _class_sorter_funcs = { &ClassIDSorter }; 
static const std::initializer_list<PickerClassList::FilterFunction * const> _class_filter_funcs = { &ClassTagNameFilter }; 
static const std::initializer_list<PickerTypeList::SortFunction * const> _type_sorter_funcs = { TypeIDSorter }; 
static const std::initializer_list<PickerTypeList::FilterFunction * const> _type_filter_funcs = { TypeTagNameFilter }; 
 
PickerWindow::PickerWindow(WindowDesc &desc, Window *parent, int window_number, PickerCallbacks &callbacks) : PickerWindowBase(desc, parent), callbacks(callbacks),
  class_editbox(EDITBOX_MAX_SIZE * MAX_CHAR_LENGTH, EDITBOX_MAX_SIZE),
  type_editbox(EDITBOX_MAX_SIZE * MAX_CHAR_LENGTH, EDITBOX_MAX_SIZE)
{
  this->window_number = window_number;
 
  /* Init of nested tree is deferred.
   * PickerWindow::ConstructWindow must be called by the inheriting window. */
}
 
void PickerWindow::ConstructWindow()
{
  this->CreateNestedTree();
 
  /* Test if pickers should be active.*/
  bool isActive = this->callbacks.IsActive();
 
  /* Functionality depends on widgets being present, not window class. */
  this->has_class_picker = isActive && this->GetWidget<NWidgetBase>(WID_PW_CLASS_LIST) != nullptr && this->callbacks.HasClassChoice();
  this->has_type_picker = isActive && this->GetWidget<NWidgetBase>(WID_PW_TYPE_MATRIX) != nullptr;
 
  if (this->has_class_picker) {
    this->GetWidget<NWidgetCore>(WID_PW_CLASS_LIST)->tool_tip = this->callbacks.GetClassTooltip();
 
    this->querystrings[WID_PW_CLASS_FILTER] = &this->class_editbox;
  } else {
    if (auto *nwid = this->GetWidget<NWidgetStacked>(WID_PW_CLASS_SEL); nwid != nullptr) {
      /* Check the container orientation. MakeNWidgets adds an additional NWID_VERTICAL container so we check the grand-parent. */
      bool is_vertical = (nwid->parent->parent->type == NWID_VERTICAL);
      nwid->SetDisplayedPlane(is_vertical ? SZSP_HORIZONTAL : SZSP_VERTICAL);
    }
  }
 
  this->class_editbox.cancel_button = QueryString::ACTION_CLEAR;
  this->class_string_filter.SetFilterTerm(this->class_editbox.text.buf);
  this->class_string_filter.callbacks = &this->callbacks;
 
  this->classes.SetListing(this->callbacks.class_last_sorting);
  this->classes.SetFiltering(this->callbacks.class_last_filtering);
  this->classes.SetSortFuncs(_class_sorter_funcs);
  this->classes.SetFilterFuncs(_class_filter_funcs);
 
  if (this->has_type_picker) {
    /* Update used and saved type information. */
    this->callbacks.saved = this->callbacks.UpdateSavedItems(this->callbacks.saved);
    this->callbacks.used.clear();
    this->callbacks.FillUsedItems(this->callbacks.used);
 
    SetWidgetDisabledState(WID_PW_MODE_ALL, !this->callbacks.HasClassChoice());
 
    this->GetWidget<NWidgetCore>(WID_PW_TYPE_ITEM)->tool_tip = this->callbacks.GetTypeTooltip();
 
    auto *matrix = this->GetWidget<NWidgetMatrix>(WID_PW_TYPE_MATRIX);
    matrix->SetScrollbar(this->GetScrollbar(WID_PW_TYPE_SCROLL));
 
    this->querystrings[WID_PW_TYPE_FILTER] = &this->type_editbox;
  } else {
    if (auto *nwid = this->GetWidget<NWidgetStacked>(WID_PW_TYPE_SEL); nwid != nullptr) {
      /* Check the container orientation. MakeNWidgets adds an additional NWID_VERTICAL container so we check the grand-parent. */
      bool is_vertical = (nwid->parent->parent->type == NWID_VERTICAL);
      nwid->SetDisplayedPlane(is_vertical ? SZSP_HORIZONTAL : SZSP_VERTICAL);
    }
  }
 
  this->type_editbox.cancel_button = QueryString::ACTION_CLEAR;
  this->type_string_filter.SetFilterTerm(this->type_editbox.text.buf);
  this->type_string_filter.callbacks = &this->callbacks;
 
  this->types.SetListing(this->callbacks.type_last_sorting);
  this->types.SetFiltering(this->callbacks.type_last_filtering);
  this->types.SetSortFuncs(_type_sorter_funcs);
  this->types.SetFilterFuncs(_type_filter_funcs);
 
  this->FinishInitNested(this->window_number);
 
  this->InvalidateData(PFI_CLASS | PFI_TYPE | PFI_POSITION | PFI_VALIDATE);
}
 
void PickerWindow::Close(int data)
{
  this->callbacks.Close(data);
  this->PickerWindowBase::Close(data);
}
 
void PickerWindow::UpdateWidgetSize(WidgetID widget, Dimension &size, const Dimension &padding, Dimension &fill, Dimension &resize)
{
  switch (widget) {
    /* Class picker */
    case WID_PW_CLASS_LIST:
      resize.height = GetCharacterHeight(FS_NORMAL) + padding.height;
      size.height = 5 * resize.height;
      break;
 
    /* Type picker */
    case WID_PW_TYPE_MATRIX:
      /* At least two items wide. */
      size.width += resize.width;
      fill.width = resize.width;
      fill.height = 1;
 
      /* Resizing in X direction only at blob size, but at pixel level in Y. */
      resize.height = 1;
      break;
 
    /* Type picker */
    case WID_PW_TYPE_ITEM:
      size.width  = ScaleGUITrad(PREVIEW_WIDTH) + WidgetDimensions::scaled.fullbevel.Horizontal();
      size.height = ScaleGUITrad(PREVIEW_HEIGHT) + WidgetDimensions::scaled.fullbevel.Vertical();
      break;
  }
}
 
void PickerWindow::DrawWidget(const Rect &r, WidgetID widget) const
{
  switch (widget) {
    /* Class picker */
    case WID_PW_CLASS_LIST: {
      Rect ir = r.Shrink(WidgetDimensions::scaled.matrix);
      const int selected = this->callbacks.GetSelectedClass();
      const auto vscroll = this->GetScrollbar(WID_PW_CLASS_SCROLL);
      const int y_step = this->GetWidget<NWidgetResizeBase>(widget)->resize_y;
      auto [first, last] = vscroll->GetVisibleRangeIterators(this->classes);
      for (auto it = first; it != last; ++it) {
        DrawString(ir, this->callbacks.GetClassName(*it), *it == selected ? TC_WHITE : TC_BLACK);
        ir.top += y_step;
      }
      break;
    }
 
    /* Type picker */
    case WID_PW_TYPE_ITEM: {
      assert(this->GetWidget<NWidgetBase>(widget)->GetParentWidget<NWidgetMatrix>()->GetCurrentElement() < static_cast<int>(this->types.size()));
      const auto &item = this->types[this->GetWidget<NWidgetBase>(widget)->GetParentWidget<NWidgetMatrix>()->GetCurrentElement()];
 
      DrawPixelInfo tmp_dpi;
      Rect ir = r.Shrink(WidgetDimensions::scaled.bevel);
      if (FillDrawPixelInfo(&tmp_dpi, ir)) {
        AutoRestoreBackup dpi_backup(_cur_dpi, &tmp_dpi);
        int x = (ir.Width()  - ScaleSpriteTrad(PREVIEW_WIDTH)) / 2 + ScaleSpriteTrad(PREVIEW_LEFT);
        int y = (ir.Height() + ScaleSpriteTrad(PREVIEW_HEIGHT)) / 2 - ScaleSpriteTrad(PREVIEW_BOTTOM);
 
        this->callbacks.DrawType(x, y, item.class_index, item.index);
        if (this->callbacks.saved.contains(item)) {
          DrawSprite(SPR_BLOT, PALETTE_TO_YELLOW, 0, 0);
        }
        if (this->callbacks.used.contains(item)) {
          DrawSprite(SPR_BLOT, PALETTE_TO_GREEN, ir.Width() - GetSpriteSize(SPR_BLOT).width, 0);
        }
      }
 
      if (!this->callbacks.IsTypeAvailable(item.class_index, item.index)) {
        GfxFillRect(ir, GetColourGradient(COLOUR_GREY, SHADE_DARKER), FILLRECT_CHECKER);
      }
      break;
    }
 
    case WID_PW_TYPE_NAME:
      DrawString(r, this->callbacks.GetTypeName(this->callbacks.GetSelectedClass(), this->callbacks.GetSelectedType()), TC_ORANGE, SA_CENTER);
      break;
  }
}
 
void PickerWindow::OnResize()
{
  if (this->has_class_picker) {
    this->GetScrollbar(WID_PW_CLASS_SCROLL)->SetCapacityFromWidget(this, WID_PW_CLASS_LIST);
  }
}
 
void PickerWindow::OnClick(Point pt, WidgetID widget, int)
{
  switch (widget) {
    /* Class Picker */
    case WID_PW_CLASS_LIST: {
      const auto vscroll = this->GetWidget<NWidgetScrollbar>(WID_PW_CLASS_SCROLL);
      auto it = vscroll->GetScrolledItemFromWidget(this->classes, pt.y, this, WID_PW_CLASS_LIST);
      if (it == this->classes.end()) return;
 
      if (this->callbacks.GetSelectedClass() != *it || HasBit(this->callbacks.mode, PFM_ALL)) {
        ClrBit(this->callbacks.mode, PFM_ALL); // Disable showing all.
        this->callbacks.SetSelectedClass(*it);
        this->InvalidateData(PFI_TYPE | PFI_POSITION | PFI_VALIDATE);
      }
      if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
      CloseWindowById(WC_SELECT_STATION, 0);
      break;
    }
 
    case WID_PW_MODE_ALL:
    case WID_PW_MODE_USED:
    case WID_PW_MODE_SAVED:
      ToggleBit(this->callbacks.mode, widget - WID_PW_MODE_ALL);
      if (!this->IsWidgetDisabled(WID_PW_MODE_ALL) && HasBit(this->callbacks.mode, widget - WID_PW_MODE_ALL)) {
        /* Enabling used or saved filters automatically enables all. */
        SetBit(this->callbacks.mode, PFM_ALL);
      }
      this->InvalidateData(PFI_CLASS | PFI_TYPE | PFI_POSITION);
      break;
 
    /* Type Picker */
    case WID_PW_TYPE_ITEM: {
      int sel = this->GetWidget<NWidgetBase>(widget)->GetParentWidget<NWidgetMatrix>()->GetCurrentElement();
      assert(sel < (int)this->types.size());
      const auto &item = this->types[sel];
 
      if (_ctrl_pressed) {
        auto it = this->callbacks.saved.find(item);
        if (it == std::end(this->callbacks.saved)) {
          this->callbacks.saved.insert(item);
        } else {
          this->callbacks.saved.erase(it);
        }
        this->InvalidateData(PFI_TYPE);
        break;
      }
 
      if (this->callbacks.IsTypeAvailable(item.class_index, item.index)) {
        this->callbacks.SetSelectedClass(item.class_index);
        this->callbacks.SetSelectedType(item.index);
        this->InvalidateData(PFI_POSITION);
      }
      if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
      CloseWindowById(WC_SELECT_STATION, 0);
      break;
    }
  }
}
 
void PickerWindow::OnInvalidateData(int data, bool gui_scope)
{
  if (!gui_scope) return;
 
  if ((data & PFI_CLASS) != 0) this->classes.ForceRebuild();
  if ((data & PFI_TYPE) != 0) this->types.ForceRebuild();
 
  this->BuildPickerClassList();
  if ((data & PFI_VALIDATE) != 0) this->EnsureSelectedClassIsValid();
  if ((data & PFI_POSITION) != 0) this->EnsureSelectedClassIsVisible();
 
  this->BuildPickerTypeList();
  if ((data & PFI_VALIDATE) != 0) this->EnsureSelectedTypeIsValid();
  if ((data & PFI_POSITION) != 0) this->EnsureSelectedTypeIsVisible();
 
  if (this->has_type_picker) {
    SetWidgetLoweredState(WID_PW_MODE_ALL, HasBit(this->callbacks.mode, PFM_ALL));
    SetWidgetLoweredState(WID_PW_MODE_USED, HasBit(this->callbacks.mode, PFM_USED));
    SetWidgetLoweredState(WID_PW_MODE_SAVED, HasBit(this->callbacks.mode, PFM_SAVED));
  }
}
 
EventState PickerWindow::OnHotkey(int hotkey)
{
  switch (hotkey) {
    case PCWHK_FOCUS_FILTER_BOX:
      /* Cycle between the two edit boxes. */
      if (this->has_type_picker && (this->nested_focus == nullptr || this->nested_focus->index != WID_PW_TYPE_FILTER)) {
        this->SetFocusedWidget(WID_PW_TYPE_FILTER);
      } else if (this->has_class_picker && (this->nested_focus == nullptr || this->nested_focus->index != WID_PW_CLASS_FILTER)) {
        this->SetFocusedWidget(WID_PW_CLASS_FILTER);
      }
      SetFocusedWindow(this);
      return ES_HANDLED;
 
    default:
      return ES_NOT_HANDLED;
  }
}
 
void PickerWindow::OnEditboxChanged(WidgetID wid)
{
  switch (wid) {
    case WID_PW_CLASS_FILTER:
      this->class_string_filter.SetFilterTerm(this->class_editbox.text.buf);
      this->classes.SetFilterState(!class_string_filter.IsEmpty());
      this->InvalidateData(PFI_CLASS);
      break;
 
    case WID_PW_TYPE_FILTER:
      this->type_string_filter.SetFilterTerm(this->type_editbox.text.buf);
      this->types.SetFilterState(!type_string_filter.IsEmpty());
      this->InvalidateData(PFI_TYPE);
      break;
 
    default:
      break;
  }
}
 
void PickerWindow::BuildPickerClassList()
{
  if (!this->classes.NeedRebuild()) return;
 
  int count = this->callbacks.GetClassCount();
 
  this->classes.clear();
  this->classes.reserve(count);
 
  bool filter_used = HasBit(this->callbacks.mode, PFM_USED);
  bool filter_saved = HasBit(this->callbacks.mode, PFM_SAVED);
  for (int i = 0; i < count; i++) {
    if (this->callbacks.GetClassName(i) == INVALID_STRING_ID) continue;
    if (filter_used && std::none_of(std::begin(this->callbacks.used), std::end(this->callbacks.used), [i](const PickerItem &item) { return item.class_index == i; })) continue;
    if (filter_saved && std::none_of(std::begin(this->callbacks.saved), std::end(this->callbacks.saved), [i](const PickerItem &item) { return item.class_index == i; })) continue;
    this->classes.emplace_back(i);
  }
 
  this->classes.Filter(this->class_string_filter);
  this->classes.RebuildDone();
  this->classes.Sort();
 
  if (!this->has_class_picker) return;
  this->GetScrollbar(WID_PW_CLASS_SCROLL)->SetCount(this->classes.size());
}
 
void PickerWindow::EnsureSelectedClassIsValid()
{
  int class_index = this->callbacks.GetSelectedClass();
  if (std::binary_search(std::begin(this->classes), std::end(this->classes), class_index)) return;
 
  if (!this->classes.empty()) {
    class_index = this->classes.front();
  } else {
    /* Classes can be empty if filters are enabled, find the first usable class. */
    int count = this->callbacks.GetClassCount();
    for (int i = 0; i < count; i++) {
      if (this->callbacks.GetClassName(i) == INVALID_STRING_ID) continue;
      class_index = i;
      break;
    }
  }
 
  this->callbacks.SetSelectedClass(class_index);
  this->types.ForceRebuild();
}
 
void PickerWindow::EnsureSelectedClassIsVisible()
{
  if (!this->has_class_picker) return;
  if (this->classes.empty()) return;
 
  auto it = std::find(std::begin(this->classes), std::end(this->classes), this->callbacks.GetSelectedClass());
  if (it == std::end(this->classes)) return;
 
  int pos = static_cast<int>(std::distance(std::begin(this->classes), it));
  this->GetScrollbar(WID_PW_CLASS_SCROLL)->ScrollTowards(pos);
}
 
void PickerWindow::RefreshUsedTypeList()
{
  if (!this->has_type_picker) return;
 
  this->callbacks.used.clear();
  this->callbacks.FillUsedItems(this->callbacks.used);
  this->InvalidateData(PFI_TYPE);
}
 
void PickerWindow::BuildPickerTypeList()
{
  if (!this->types.NeedRebuild()) return;
 
  this->types.clear();
 
  bool show_all = HasBit(this->callbacks.mode, PFM_ALL);
  bool filter_used = HasBit(this->callbacks.mode, PFM_USED);
  bool filter_saved = HasBit(this->callbacks.mode, PFM_SAVED);
  int cls_id = this->callbacks.GetSelectedClass();
 
  if (filter_used) {
    /* Showing used items. May also be filtered by saved items. */
    this->types.reserve(this->callbacks.used.size());
    for (const PickerItem &item : this->callbacks.used) {
      if (!show_all && item.class_index != cls_id) continue;
      if (this->callbacks.GetTypeName(item.class_index, item.index) == INVALID_STRING_ID) continue;
      this->types.emplace_back(item);
    }
  } else if (filter_saved) {
    /* Showing only saved items. */
    this->types.reserve(this->callbacks.saved.size());
    for (const PickerItem &item : this->callbacks.saved) {
      /* The used list may contain items that aren't currently loaded, skip these. */
      if (item.class_index == -1) continue;
      if (!show_all && item.class_index != cls_id) continue;
      if (this->callbacks.GetTypeName(item.class_index, item.index) == INVALID_STRING_ID) continue;
      this->types.emplace_back(item);
    }
  } else if (show_all) {
    /* Reserve enough space for everything. */
    int total = 0;
    for (int class_index : this->classes) total += this->callbacks.GetTypeCount(class_index);
    this->types.reserve(total);
    /* Add types in all classes. */
    for (int class_index : this->classes) {
      int count = this->callbacks.GetTypeCount(class_index);
      for (int i = 0; i < count; i++) {
        if (this->callbacks.GetTypeName(class_index, i) == INVALID_STRING_ID) continue;
        this->types.emplace_back(this->callbacks.GetPickerItem(class_index, i));
      }
    }
  } else {
    /* Add types in only the selected class. */
    if (cls_id >= 0 && cls_id < this->callbacks.GetClassCount()) {
      int count = this->callbacks.GetTypeCount(cls_id);
      this->types.reserve(count);
      for (int i = 0; i < count; i++) {
        if (this->callbacks.GetTypeName(cls_id, i) == INVALID_STRING_ID) continue;
        this->types.emplace_back(this->callbacks.GetPickerItem(cls_id, i));
      }
    }
  }
 
  this->types.Filter(this->type_string_filter);
  this->types.RebuildDone();
  this->types.Sort();
 
  if (!this->has_type_picker) return;
  this->GetWidget<NWidgetMatrix>(WID_PW_TYPE_MATRIX)->SetCount(static_cast<int>(this->types.size()));
}
 
void PickerWindow::EnsureSelectedTypeIsValid()
{
  int class_index = this->callbacks.GetSelectedClass();
  int index = this->callbacks.GetSelectedType();
  if (std::any_of(std::begin(this->types), std::end(this->types), [class_index, index](const auto &item) { return item.class_index == class_index && item.index == index; })) return;
 
  if (!this->types.empty()) {
    class_index = this->types.front().class_index;
    index = this->types.front().index;
  } else {
    /* Types can be empty if filters are enabled, find the first usable type. */
    int count = this->callbacks.GetTypeCount(class_index);
    for (int i = 0; i < count; i++) {
      if (this->callbacks.GetTypeName(class_index, i) == INVALID_STRING_ID) continue;
      index = i;
      break;
    }
  }
  this->callbacks.SetSelectedClass(class_index);
  this->callbacks.SetSelectedType(index);
}
 
void PickerWindow::EnsureSelectedTypeIsVisible()
{
  if (!this->has_type_picker) return;
  if (this->types.empty()) {
    this->GetWidget<NWidgetMatrix>(WID_PW_TYPE_MATRIX)->SetClicked(-1);
    return;
  }
 
  int class_index = this->callbacks.GetSelectedClass();
  int index = this->callbacks.GetSelectedType();
 
  auto it = std::find_if(std::begin(this->types), std::end(this->types), [class_index, index](const auto &item) { return item.class_index == class_index && item.index == index; });
  if (it == std::end(this->types)) return;
 
  int pos = static_cast<int>(std::distance(std::begin(this->types), it));
  this->GetWidget<NWidgetMatrix>(WID_PW_TYPE_MATRIX)->SetClicked(pos);
}
 
std::unique_ptr<NWidgetBase> MakePickerClassWidgets()
{
  static constexpr NWidgetPart picker_class_widgets[] = {
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_PW_CLASS_SEL),
      NWidget(NWID_VERTICAL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
          NWidget(WWT_EDITBOX, COLOUR_DARK_GREEN, WID_PW_CLASS_FILTER), SetMinimalSize(144, 0), SetPadding(2), SetFill(1, 0), SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
          NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
            NWidget(WWT_MATRIX, COLOUR_GREY, WID_PW_CLASS_LIST), SetFill(1, 1), SetResize(1, 1), SetPadding(WidgetDimensions::unscaled.picker),
                SetMatrixDataTip(1, 0, STR_NULL), SetScrollbar(WID_PW_CLASS_SCROLL),
          EndContainer(),
          NWidget(NWID_VSCROLLBAR, COLOUR_DARK_GREEN, WID_PW_CLASS_SCROLL),
        EndContainer(),
      EndContainer(),
    EndContainer(),
  };
 
  return MakeNWidgets(picker_class_widgets, nullptr);
}
 
std::unique_ptr<NWidgetBase> MakePickerTypeWidgets()
{
  static constexpr NWidgetPart picker_type_widgets[] = {
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_PW_TYPE_SEL),
      NWidget(NWID_VERTICAL),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
          NWidget(WWT_EDITBOX, COLOUR_DARK_GREEN, WID_PW_TYPE_FILTER), SetPadding(2), SetResize(1, 0), SetFill(1, 0), SetDataTip(STR_LIST_FILTER_OSKTITLE, STR_LIST_FILTER_TOOLTIP),
        EndContainer(),
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_TEXTBTN, COLOUR_DARK_GREEN, WID_PW_MODE_ALL), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_PICKER_MODE_ALL, STR_PICKER_MODE_ALL_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_DARK_GREEN, WID_PW_MODE_USED), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_PICKER_MODE_USED, STR_PICKER_MODE_USED_TOOLTIP),
          NWidget(WWT_TEXTBTN, COLOUR_DARK_GREEN, WID_PW_MODE_SAVED), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_PICKER_MODE_SAVED, STR_PICKER_MODE_SAVED_TOOLTIP),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
          NWidget(WWT_PANEL, COLOUR_DARK_GREEN), SetScrollbar(WID_PW_TYPE_SCROLL),
            NWidget(NWID_MATRIX, COLOUR_DARK_GREEN, WID_PW_TYPE_MATRIX), SetPIP(0, 2, 0), SetPadding(WidgetDimensions::unscaled.picker),
              NWidget(WWT_PANEL, COLOUR_GREY, WID_PW_TYPE_ITEM), SetScrollbar(WID_PW_TYPE_SCROLL),
              EndContainer(),
            EndContainer(),
          EndContainer(),
          NWidget(NWID_VSCROLLBAR, COLOUR_DARK_GREEN, WID_PW_TYPE_SCROLL),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
          NWidget(WWT_PANEL, COLOUR_DARK_GREEN),
            NWidget(WWT_EMPTY, INVALID_COLOUR, WID_PW_TYPE_NAME), SetPadding(WidgetDimensions::unscaled.framerect), SetResize(1, 0), SetFill(1, 0), SetMinimalTextLines(1, 0),
          EndContainer(),
          NWidget(WWT_RESIZEBOX, COLOUR_DARK_GREEN, WID_PW_TYPE_RESIZE),
        EndContainer(),
      EndContainer(),
    EndContainer(),
  };
 
  return MakeNWidgets(picker_type_widgets, nullptr);
}