OpenRCT2/src/openrct2-ui/windows/EditorInventionsList.cpp

#pragma region Copyright (c) 2014-2017 OpenRCT2 Developers
/*****************************************************************************
 * OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
 *
 * OpenRCT2 is the work of many authors, a full list can be found in contributors.md
 * For more information, visit https://github.com/OpenRCT2/OpenRCT2
 *
 * OpenRCT2 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * A full copy of the GNU General Public License can be found in licence.txt
 *****************************************************************************/
#pragma endregion

#include <openrct2/interface/Cursors.h>
#include <openrct2/object/DefaultObjects.h>
#include <openrct2/object/ObjectManager.h>
#include <openrct2/object/ObjectRepository.h>
#include <openrct2/OpenRCT2.h>
#include <openrct2/core/Util.hpp>
#include <openrct2-ui/windows/Window.h>

#include <openrct2/Editor.h>
#include <openrct2/Input.h>
#include <openrct2-ui/interface/Widget.h>
#include <openrct2/localisation/Localisation.h>
#include <openrct2/management/Research.h>
#include <openrct2/sprites.h>
#include <openrct2/util/Util.h>
#include <openrct2/world/Scenery.h>
#include <openrct2/ride/RideGroupManager.h>

#pragma region Widgets

#define WW 600
#define WH 400

// clang-format off
enum {
    WIDX_BACKGROUND,
    WIDX_TITLE,
    WIDX_CLOSE,
    WIDX_RESIZE,
    WIDX_TAB_1,
    WIDX_PRE_RESEARCHED_SCROLL,
    WIDX_RESEARCH_ORDER_SCROLL,
    WIDX_PREVIEW,
    WIDX_MOVE_ITEMS_TO_TOP,
    WIDX_MOVE_ITEMS_TO_BOTTOM,
    WIDX_RANDOM_SHUFFLE
};

static rct_widget window_editor_inventions_list_widgets[] = {
    { WWT_FRAME,            0,  0,      599,    0,      399,    STR_NONE,               STR_NONE                },
    { WWT_CAPTION,          0,  1,      598,    1,      14,     STR_INVENTION_LIST,     STR_WINDOW_TITLE_TIP    },
    { WWT_CLOSEBOX,         0,  587,    597,    2,      13,     STR_CLOSE_X,            STR_CLOSE_WINDOW_TIP    },
    { WWT_RESIZE,           1,  0,      599,    43,     399,    STR_NONE,               STR_NONE                },
    { WWT_TAB,              1,  3,      33,     17,     43,     IMAGE_TYPE_REMAP | SPR_TAB,   STR_NONE          },
    { WWT_SCROLL,           1,  4,      371,    56,     216,    SCROLL_VERTICAL,        STR_NONE                },
    { WWT_SCROLL,           1,  4,      371,    231,    387,    SCROLL_VERTICAL,        STR_NONE                },
    { WWT_FLATBTN,          1,  431,    544,    106,    219,    0xFFFFFFFF,             STR_NONE                },
    { WWT_BUTTON,           1,  375,    594,    343,    356,    STR_MOVE_ALL_TOP,       STR_NONE                },
    { WWT_BUTTON,           1,  375,    594,    358,    371,    STR_MOVE_ALL_BOTTOM,    STR_NONE                },
    { WWT_BUTTON,           1,  375,    594,    373,    386,    STR_RANDOM_SHUFFLE,     STR_RANDOM_SHUFFLE_TIP  },
    { WIDGETS_END }
};

static rct_widget window_editor_inventions_list_drag_widgets[] = {
    { WWT_IMGBTN,           0,  0,      149,    0,      13,     STR_NONE,               STR_NONE                },
    { WIDGETS_END }
};

#pragma endregion

#pragma region Events

static void window_editor_inventions_list_close(rct_window *w);
static void window_editor_inventions_list_mouseup(rct_window *w, rct_widgetindex widgetIndex);
static void window_editor_inventions_list_resize(rct_window *w);
static void window_editor_inventions_list_update(rct_window *w);
static void window_editor_inventions_list_scrollgetheight(rct_window *w, sint32 scrollIndex, sint32 *width, sint32 *height);
static void window_editor_inventions_list_scrollmousedown(rct_window *w, sint32 scrollIndex, sint32 x, sint32 y);
static void window_editor_inventions_list_scrollmouseover(rct_window *w, sint32 scrollIndex, sint32 x, sint32 y);
static void window_editor_inventions_list_tooltip(rct_window* w, rct_widgetindex widgetIndex, rct_string_id *stringId);
static void window_editor_inventions_list_cursor(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y, sint32 *cursorId);
static void window_editor_inventions_list_invalidate(rct_window *w);
static void window_editor_inventions_list_paint(rct_window *w, rct_drawpixelinfo *dpi);
static void window_editor_inventions_list_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex);

static void window_editor_inventions_list_drag_cursor(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y, sint32 *cursorId);
static void window_editor_inventions_list_drag_moved(rct_window* w, sint32 x, sint32 y);
static void window_editor_inventions_list_drag_paint(rct_window *w, rct_drawpixelinfo *dpi);

static rct_string_id window_editor_inventions_list_prepare_name(const rct_research_item * researchItem, bool withGap);

// 0x0098177C
static rct_window_event_list window_editor_inventions_list_events = {
    window_editor_inventions_list_close,
    window_editor_inventions_list_mouseup,
    window_editor_inventions_list_resize,
    nullptr,
    nullptr,
    nullptr,
    window_editor_inventions_list_update,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    window_editor_inventions_list_scrollgetheight,
    window_editor_inventions_list_scrollmousedown,
    nullptr,
    window_editor_inventions_list_scrollmouseover,
    nullptr,
    nullptr,
    nullptr,
    window_editor_inventions_list_tooltip,
    window_editor_inventions_list_cursor,
    nullptr,
    window_editor_inventions_list_invalidate,
    window_editor_inventions_list_paint,
    window_editor_inventions_list_scrollpaint
};

// 0x009817EC
static rct_window_event_list window_editor_inventions_list_drag_events = {
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    window_editor_inventions_list_drag_cursor,
    window_editor_inventions_list_drag_moved,
    nullptr,
    window_editor_inventions_list_drag_paint,
    nullptr
};

#pragma endregion

static rct_research_item *_editorInventionsListDraggedItem;

static constexpr const rct_string_id EditorInventionsResearchCategories[] = {
    STR_RESEARCH_NEW_TRANSPORT_RIDES,
    STR_RESEARCH_NEW_GENTLE_RIDES,
    STR_RESEARCH_NEW_ROLLER_COASTERS,
    STR_RESEARCH_NEW_THRILL_RIDES,
    STR_RESEARCH_NEW_WATER_RIDES,
    STR_RESEARCH_NEW_SHOPS_AND_STALLS,
    STR_RESEARCH_NEW_SCENERY_AND_THEMING,
};
// clang-format on

static void window_editor_inventions_list_drag_open(rct_research_item *researchItem);
static void move_research_item(rct_research_item *beforeItem);

/**
 *
 *  rct2: 0x0068596F
 * Sets rides that are in use to be always researched
 */
static void research_rides_setup()
{
    // Reset all objects to not required
    for (uint8 objectType = OBJECT_TYPE_RIDE; objectType < OBJECT_TYPE_COUNT; objectType++)
    {
        auto maxObjects = object_entry_group_counts[objectType];
        for (sint32 i = 0; i < maxObjects; i++)
        {
            Editor::ClearSelectedObject(objectType, i, OBJECT_SELECTION_FLAG_ALL);
        }
    }

    // Set research required for rides in use
    for (uint16 rideIndex = 0; rideIndex < MAX_RIDES; rideIndex++)
    {
        auto ride = get_ride(rideIndex);
        if (ride->type != RIDE_TYPE_NULL)
        {
            Editor::SetSelectedObject(OBJECT_TYPE_RIDE, ride->subtype, OBJECT_SELECTION_FLAG_SELECTED);
        }
    }
}

/**
 *
 *  rct2: 0x0068590C
 * Sets the critical scenery sets to always researched
 */
static void research_scenery_groups_setup()
{
    for (size_t i = 0; i < Util::CountOf(RequiredSelectedObjects); i++) {
        const rct_object_entry * object = &RequiredSelectedObjects[i];

        uint8 entry_type, entryIndex;
        if (!find_object_in_entry_group(object, &entry_type, &entryIndex))
            continue;

        if (entry_type != OBJECT_TYPE_SCENERY_GROUP)
            continue;

        rct_research_item* research = gResearchItems;
        for (; research->rawValue != RESEARCHED_ITEMS_END; research++)
        {
            if ((research->rawValue & 0xFFFFFF) != entryIndex)
                continue;

            research->flags |= RESEARCH_ENTRY_FLAG_SCENERY_SET_ALWAYS_RESEARCHED;
            _editorInventionsListDraggedItem = research;
            move_research_item(gResearchItems);
            _editorInventionsListDraggedItem = nullptr;
        }
    }
}

/**
 *
 *  rct2: 0x00685901
 */
static void research_always_researched_setup()
{
    research_rides_setup();
    research_scenery_groups_setup();
}



/**
 *
 *  rct2: 0x006855E7
 */
static void move_research_item(rct_research_item *beforeItem)
{
    rct_window *w;
    rct_research_item *researchItem, draggedItem;

    if (_editorInventionsListDraggedItem + 1 == beforeItem)
        return;

    // Back up the dragged item
    draggedItem = *_editorInventionsListDraggedItem;

    // Remove dragged item from list
    researchItem = _editorInventionsListDraggedItem;
    do {
        *researchItem = *(researchItem + 1);
        researchItem++;
    } while (researchItem->rawValue != RESEARCHED_ITEMS_END_2);
    // At end of this researchItem points to the end of the list

    if (beforeItem > _editorInventionsListDraggedItem)
        beforeItem--;

    // Add dragged item to list
    do {
        *researchItem = *(researchItem - 1);
        researchItem--;
    } while (researchItem != beforeItem);

    *researchItem = draggedItem;

    w = window_find_by_class(WC_EDITOR_INVENTION_LIST);
    if (w != nullptr) {
        w->research_item = nullptr;
        window_invalidate(w);
    }
}

/**
 *
 *  rct2: 0x0068558E
 */
static rct_research_item *window_editor_inventions_list_get_item_from_scroll_y(sint32 scrollIndex, sint32 y)
{
    rct_research_item *researchItem;

    researchItem = gResearchItems;

    if (scrollIndex != 0) {
        // Skip pre-researched items
        for (; researchItem->rawValue != RESEARCHED_ITEMS_SEPARATOR; researchItem++) { }
        researchItem++;
    }

    for (; researchItem->rawValue != RESEARCHED_ITEMS_SEPARATOR && researchItem->rawValue != RESEARCHED_ITEMS_END; researchItem++)
    {
        y -= SCROLLABLE_ROW_HEIGHT;
        if (y < 0)
        {
            return researchItem;
        }
    }

    return nullptr;
}

/**
 *
 *  rct2: 0x006855BB
 */
static rct_research_item *window_editor_inventions_list_get_item_from_scroll_y_include_seps(sint32 scrollIndex, sint32 y)
{
    rct_research_item *researchItem;

    researchItem = gResearchItems;

    if (scrollIndex != 0) {
        // Skip pre-researched items
        for (; researchItem->rawValue != RESEARCHED_ITEMS_SEPARATOR; researchItem++) { }
        researchItem++;
    }

    for (; researchItem->rawValue != RESEARCHED_ITEMS_SEPARATOR && researchItem->rawValue != RESEARCHED_ITEMS_END; researchItem++)
    {
        y -= SCROLLABLE_ROW_HEIGHT;
        if (y < 0)
        {
            return researchItem;
        }
    }

    return researchItem;
}

static rct_research_item *get_research_item_at(sint32 x, sint32 y)
{
    rct_window *w = window_find_by_class(WC_EDITOR_INVENTION_LIST);
    if (w != nullptr && w->x <= x && w->y < y && w->x + w->width > x && w->y + w->height > y) {
        rct_widgetindex widgetIndex = window_find_widget_from_point(w, x, y);
        rct_widget *widget = &w->widgets[widgetIndex];
        if (widgetIndex == WIDX_PRE_RESEARCHED_SCROLL || widgetIndex == WIDX_RESEARCH_ORDER_SCROLL) {
            gPressedWidget.widget_index = widgetIndex;
            sint32 outX, outY, outScrollArea, outScrollId;
            widget_scroll_get_part(w, widget, x, y, &outX, &outY, &outScrollArea, &outScrollId);
            if (outScrollArea == SCROLL_PART_VIEW) {
                outScrollId = outScrollId == 0 ? 0 : 1;

                sint32 scrollY = y - (w->y + widget->top) + w->scrolls[outScrollId].v_top + 5;
                return window_editor_inventions_list_get_item_from_scroll_y_include_seps(outScrollId, scrollY);
            }
        }
    }

    return nullptr;
}

/**
 *
 *  rct2: 0x00684E04
 */
rct_window * window_editor_inventions_list_open()
{
    rct_window *w;

    w = window_bring_to_front_by_class(WC_EDITOR_INVENTION_LIST);
    if (w != nullptr)
        return w;

    research_always_researched_setup();

    w = window_create_centred(
        WW,
        WH,
        &window_editor_inventions_list_events,
        WC_EDITOR_INVENTION_LIST,
        WF_NO_SCROLLING | WF_RESIZABLE
    );
    w->widgets = window_editor_inventions_list_widgets;
    w->enabled_widgets =
        (1 << WIDX_CLOSE) |
        (1 << WIDX_RESIZE) |
        (1 << WIDX_TAB_1) |
        (1 << WIDX_RANDOM_SHUFFLE) |
        (1 << WIDX_MOVE_ITEMS_TO_BOTTOM) |
        (1 << WIDX_MOVE_ITEMS_TO_TOP);
    window_init_scroll_widgets(w);
    w->var_4AE = 0;
    w->selected_tab = 0;
    w->research_item = nullptr;
    _editorInventionsListDraggedItem = nullptr;

    w->min_width = WW;
    w->min_height = WH;
    w->max_width = WW * 2;
    w->max_height = WH * 2;

    return w;
}

/**
 *
 *  rct2: 0x006853D2
 */
static void window_editor_inventions_list_close(rct_window *w)
{
    research_remove_flags();

    // When used in-game (as a cheat)
    if (!(gScreenFlags & SCREEN_FLAGS_EDITOR)) {
        gSilentResearch = true;
        research_reset_current_item();
        gSilentResearch = false;
    }
}

/**
 *
 *  rct2: 0x0068521B
 */
static void window_editor_inventions_list_mouseup(rct_window *w, rct_widgetindex widgetIndex)
{
    switch (widgetIndex) {
    case WIDX_CLOSE:
        window_close(w);
        break;
    case WIDX_RANDOM_SHUFFLE:
        research_items_shuffle();
        window_invalidate(w);
        break;
    case WIDX_MOVE_ITEMS_TO_TOP:
        research_items_make_all_researched();
        window_init_scroll_widgets(w);
        window_invalidate(w);
        break;
    case WIDX_MOVE_ITEMS_TO_BOTTOM:
        research_items_make_all_unresearched();
        window_init_scroll_widgets(w);
        window_invalidate(w);
        break;
    }
}

static void window_editor_inventions_list_resize(rct_window *w)
{
    if (w->width < w->min_width)
    {
        window_invalidate(w);
        w->width = w->min_width;
    }
    if (w->height < w->min_height)
    {
        window_invalidate(w);
        w->height = w->min_height;
    }
}

/**
 *
 *  rct2: 0x00685392
 */
static void window_editor_inventions_list_update(rct_window *w)
{
    w->frame_no++;
    window_event_invalidate_call(w);
    widget_invalidate(w, WIDX_TAB_1);

    if (_editorInventionsListDraggedItem == nullptr)
        return;

    if (window_find_by_class(WC_EDITOR_INVENTION_LIST_DRAG) != nullptr)
        return;

    _editorInventionsListDraggedItem = nullptr;
    window_invalidate(w);
}

/**
 *
 *  rct2: 0x00685239
 */
static void window_editor_inventions_list_scrollgetheight(rct_window *w, sint32 scrollIndex, sint32 *width, sint32 *height)
{
    rct_research_item *researchItem;

    *height = 0;

    // Count / skip pre-researched items
    for (researchItem = gResearchItems; researchItem->rawValue != RESEARCHED_ITEMS_SEPARATOR; researchItem++)
        *height += SCROLLABLE_ROW_HEIGHT;

    if (scrollIndex == 1) {
        researchItem++;

        // Count non pre-researched items
        *height = 0;
        for (; researchItem->rawValue != RESEARCHED_ITEMS_END; researchItem++)
            *height += SCROLLABLE_ROW_HEIGHT;
    }
}

/**
 *
 *  rct2: 0x006852D4
 */
static void window_editor_inventions_list_scrollmousedown(rct_window *w, sint32 scrollIndex, sint32 x, sint32 y)
{
    rct_research_item *researchItem;

    researchItem = window_editor_inventions_list_get_item_from_scroll_y(scrollIndex, y);
    if (researchItem == nullptr)
        return;

    // Disallow picking up always-researched items
    if (researchItem->rawValue < RESEARCHED_ITEMS_END_2 || research_item_is_always_researched(researchItem))
        return;

    window_invalidate(w);
    window_editor_inventions_list_drag_open(researchItem);
}

/**
 *
 *  rct2: 0x00685275
 */
static void window_editor_inventions_list_scrollmouseover(rct_window *w, sint32 scrollIndex, sint32 x, sint32 y)
{
    rct_research_item *researchItem;

    researchItem = window_editor_inventions_list_get_item_from_scroll_y(scrollIndex, y);
    if (researchItem != w->research_item)
    {
        w->research_item = researchItem;
        window_invalidate(w);

        // Prevent always-researched items from being highlighted when hovered over
        if (researchItem != nullptr && research_item_is_always_researched(researchItem))
        {
            w->research_item = nullptr;
        }
    }
}

/**
 *
 *  rct2: 0x0068526B
 */
static void window_editor_inventions_list_tooltip(rct_window* w, rct_widgetindex widgetIndex, rct_string_id *stringId)
{
    set_format_arg(0, rct_string_id, STR_LIST);
}

/**
 *
 *  rct2: 0x00685291
 */
static void window_editor_inventions_list_cursor(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y, sint32 *cursorId)
{
    rct_research_item *researchItem;
    sint32 scrollIndex;

    switch (widgetIndex) {
    case WIDX_PRE_RESEARCHED_SCROLL:
        scrollIndex = 0;
        break;
    case WIDX_RESEARCH_ORDER_SCROLL:
        scrollIndex = 1;
        break;
    default:
        return;
    }

    // Use the open hand as cursor for items that can be picked up
    researchItem = window_editor_inventions_list_get_item_from_scroll_y(scrollIndex, y);
    if (researchItem != nullptr && researchItem->rawValue >= RESEARCHED_ITEMS_END_2
        && !research_item_is_always_researched(researchItem))
    {
        *cursorId = CURSOR_HAND_OPEN;
    }
}

/**
 *
 *  rct2: 0x00685392
 */
static void window_editor_inventions_list_invalidate(rct_window *w)
{
    w->pressed_widgets |= 1 << WIDX_PREVIEW;
    w->pressed_widgets |= 1 << WIDX_TAB_1;

    w->widgets[WIDX_CLOSE].type =
        gScreenFlags & SCREEN_FLAGS_SCENARIO_EDITOR ? WWT_EMPTY : WWT_CLOSEBOX;

    w->widgets[WIDX_BACKGROUND].right = w->width - 1;
    w->widgets[WIDX_BACKGROUND].bottom = w->height - 1;
    w->widgets[WIDX_TITLE].right = w->width - 2;
    w->widgets[WIDX_CLOSE].left = w->width - 13;
    w->widgets[WIDX_CLOSE].right = w->width - 3;
    w->widgets[WIDX_RESIZE].right = w->width - 1;
    w->widgets[WIDX_RESIZE].bottom = w->height - 1;

    sint16 scroll_list_height = (w->height - 88) / 2;

    w->widgets[WIDX_PRE_RESEARCHED_SCROLL].bottom = 60 + scroll_list_height;
    w->widgets[WIDX_PRE_RESEARCHED_SCROLL].right = w->width - 229;

    w->widgets[WIDX_RESEARCH_ORDER_SCROLL].top = w->widgets[WIDX_PRE_RESEARCHED_SCROLL].bottom + 15;
    w->widgets[WIDX_RESEARCH_ORDER_SCROLL].bottom = w->widgets[WIDX_RESEARCH_ORDER_SCROLL].top + scroll_list_height;
    w->widgets[WIDX_RESEARCH_ORDER_SCROLL].right = w->width - 229;

    w->widgets[WIDX_PREVIEW].left = w->width - 169;
    w->widgets[WIDX_PREVIEW].right = w->width - 56;

    w->widgets[WIDX_MOVE_ITEMS_TO_TOP].top = w->height - 57;
    w->widgets[WIDX_MOVE_ITEMS_TO_TOP].bottom = w->height - 44;
    w->widgets[WIDX_MOVE_ITEMS_TO_TOP].left = w->width - 225;
    w->widgets[WIDX_MOVE_ITEMS_TO_TOP].right = w->width - 6;

    w->widgets[WIDX_MOVE_ITEMS_TO_BOTTOM].top = w->height - 42;
    w->widgets[WIDX_MOVE_ITEMS_TO_BOTTOM].bottom = w->height - 29;
    w->widgets[WIDX_MOVE_ITEMS_TO_BOTTOM].left = w->width - 225;
    w->widgets[WIDX_MOVE_ITEMS_TO_BOTTOM].right = w->width - 6;

    w->widgets[WIDX_RANDOM_SHUFFLE].top = w->height - 27;
    w->widgets[WIDX_RANDOM_SHUFFLE].bottom = w->height - 14;
    w->widgets[WIDX_RANDOM_SHUFFLE].left = w->width - 225;
    w->widgets[WIDX_RANDOM_SHUFFLE].right = w->width - 6;
}

/**
 *
 *  rct2: 0x00684EE0
 */
static void window_editor_inventions_list_paint(rct_window *w, rct_drawpixelinfo *dpi)
{
    rct_widget *widget;
    rct_research_item *researchItem;
    rct_string_id stringId;
    sint32 x, y, width;

    window_draw_widgets(w, dpi);

    // Tab image
    x = w->x + w->widgets[WIDX_TAB_1].left;
    y = w->y + w->widgets[WIDX_TAB_1].top;
    gfx_draw_sprite(dpi, SPR_TAB_FINANCES_RESEARCH_0 + (w->frame_no / 2) % 8, x, y, 0);

    // Pre-researched items label
    x = w->x + w->widgets[WIDX_PRE_RESEARCHED_SCROLL].left;
    y = w->y + w->widgets[WIDX_PRE_RESEARCHED_SCROLL].top - 11;
    gfx_draw_string_left(dpi, STR_INVENTION_PREINVENTED_ITEMS, nullptr, COLOUR_BLACK, x, y - 1);

    // Research order label
    x = w->x + w->widgets[WIDX_RESEARCH_ORDER_SCROLL].left;
    y = w->y + w->widgets[WIDX_RESEARCH_ORDER_SCROLL].top - 11;
    gfx_draw_string_left(dpi, STR_INVENTION_TO_BE_INVENTED_ITEMS, nullptr, COLOUR_BLACK, x, y - 1);

    // Preview background
    widget = &w->widgets[WIDX_PREVIEW];
    gfx_fill_rect(
        dpi,
        w->x + widget->left + 1,
        w->y + widget->top + 1,
        w->x + widget->right - 1,
        w->y + widget->bottom - 1,
        ColourMapA[w->colours[1]].darkest
    );

    researchItem = _editorInventionsListDraggedItem;
    if (researchItem == nullptr)
        researchItem = w->research_item;
    // If the research item is null or a list separator.
    if (researchItem == nullptr || researchItem->rawValue < 0)
        return;

    // Preview image
    sint32 objectEntryType = OBJECT_TYPE_SCENERY_GROUP;
    if (researchItem->type == RESEARCH_ENTRY_TYPE_RIDE)
        objectEntryType = OBJECT_TYPE_RIDE;

    auto chunk = object_entry_get_chunk(objectEntryType, researchItem->entryIndex);
    if (chunk == nullptr)
        return;

    auto entry = object_entry_get_entry(objectEntryType, researchItem->entryIndex);

    // Draw preview
    widget = &w->widgets[WIDX_PREVIEW];

    void * object = object_manager_get_loaded_object(entry);
    if (object != nullptr) {
        rct_drawpixelinfo clipDPI;
        x = w->x + widget->left + 1;
        y = w->y + widget->top + 1;
        width = widget->right - widget->left - 1;
        sint32 height = widget->bottom - widget->top - 1;
        if (clip_drawpixelinfo(&clipDPI, dpi, x, y, width, height)) {
            object_draw_preview(object, &clipDPI, width, height);
        }
    }

    // Item name
    x = w->x + ((widget->left + widget->right) / 2) + 1;
    y = w->y + widget->bottom + 3;
    width = w->width - w->widgets[WIDX_RESEARCH_ORDER_SCROLL].right - 6;

    rct_string_id drawString = window_editor_inventions_list_prepare_name(researchItem, false);
    gfx_draw_string_centred_clipped(dpi, drawString, gCommonFormatArgs, COLOUR_BLACK, x, y, width);
    y += 15;

    // Item category
    x = w->x + w->widgets[WIDX_RESEARCH_ORDER_SCROLL].right + 4;
    stringId = EditorInventionsResearchCategories[researchItem->category];
    gfx_draw_string_left(dpi, STR_INVENTION_RESEARCH_GROUP, &stringId, COLOUR_BLACK, x, y);
}

/**
 *
 *  rct2: 0x006850BD
 */
static void window_editor_inventions_list_scrollpaint(rct_window *w, rct_drawpixelinfo *dpi, sint32 scrollIndex)
{
    // Draw background
    uint8 paletteIndex = ColourMapA[w->colours[1]].mid_light;
    gfx_clear(dpi, paletteIndex);

    rct_research_item* researchItem = gResearchItems;
    sint32 researchItemEndMarker;

    if (scrollIndex == 1)
    {
        // Skip pre-researched items
        for (; researchItem->rawValue != RESEARCHED_ITEMS_SEPARATOR; researchItem++) { }
        researchItem++;
        researchItemEndMarker = RESEARCHED_ITEMS_END;
    }
    else
    {
        researchItemEndMarker = RESEARCHED_ITEMS_SEPARATOR;
    }

    sint16 boxWidth = (w->widgets[WIDX_RESEARCH_ORDER_SCROLL].right - w->widgets[WIDX_RESEARCH_ORDER_SCROLL].left);
    sint16 columnSplitOffset = boxWidth / 2;
    sint32 itemY = -SCROLLABLE_ROW_HEIGHT;
    do
    {
        itemY += SCROLLABLE_ROW_HEIGHT;
        if (itemY + SCROLLABLE_ROW_HEIGHT < dpi->y || itemY >= dpi->y + dpi->height)
            continue;

        if (w->research_item == researchItem)
        {
            sint32 top, bottom;
            if (_editorInventionsListDraggedItem == nullptr)
            {
                // Highlight
                top = itemY;
                bottom = itemY + SCROLLABLE_ROW_HEIGHT - 1;
            }
            else
            {
                // Drop horizontal rule
                top = itemY - 1;
                bottom = itemY;
            }

            gfx_filter_rect(dpi, 0, top, boxWidth, bottom, PALETTE_DARKEN_1);
        }

        if (researchItem->rawValue == RESEARCHED_ITEMS_SEPARATOR || researchItem->rawValue == RESEARCHED_ITEMS_END)
            continue;

        if (researchItem == _editorInventionsListDraggedItem)
            continue;

        utf8 groupNameBuffer[256], vehicleNameBuffer[256];
        utf8* groupNamePtr = groupNameBuffer;
        utf8* vehicleNamePtr = vehicleNameBuffer;

        uint8 colour;
        if (research_item_is_always_researched(researchItem))
        {
            if (w->research_item == researchItem && _editorInventionsListDraggedItem == nullptr)
                gCurrentFontSpriteBase = FONT_SPRITE_BASE_MEDIUM_EXTRA_DARK;
            else
                gCurrentFontSpriteBase = FONT_SPRITE_BASE_MEDIUM_DARK;
            colour = w->colours[1] | COLOUR_FLAG_INSET;
        }
        else
        {
            // TODO: this is actually just a black colour.
            colour = COLOUR_BRIGHT_GREEN | COLOUR_FLAG_TRANSLUCENT;
            gCurrentFontSpriteBase = FONT_SPRITE_BASE_MEDIUM;

            groupNamePtr = utf8_write_codepoint(groupNamePtr, colour);
            vehicleNamePtr = utf8_write_codepoint(vehicleNamePtr, colour);
        }

        rct_string_id itemNameId = research_item_get_name(researchItem);

        if (researchItem->type == RESEARCH_ENTRY_TYPE_RIDE && !RideGroupManager::RideTypeIsIndependent(researchItem->baseRideType))
        {
            const rct_string_id rideGroupName = get_ride_naming(researchItem->baseRideType, get_ride_entry(researchItem->entryIndex)).name;
            format_string(groupNamePtr, Util::CountOf(groupNameBuffer), STR_INVENTIONS_LIST_RIDE_AND_VEHICLE_NAME, (void*) &rideGroupName);
            format_string(vehicleNamePtr, Util::CountOf(vehicleNameBuffer), itemNameId, nullptr);
        }
        else
        {
            format_string(groupNamePtr, Util::CountOf(groupNameBuffer), itemNameId, nullptr);
            vehicleNamePtr = nullptr;
        }

        // Draw group name
        gfx_clip_string(groupNameBuffer, columnSplitOffset);
        gfx_draw_string(dpi, groupNameBuffer, colour, 1, itemY);

        // Draw vehicle name
        if (vehicleNamePtr)
        {
            gfx_clip_string(vehicleNameBuffer, columnSplitOffset - 11);
            gfx_draw_string(dpi, vehicleNameBuffer, colour, columnSplitOffset + 1, itemY);
        }
    }
    while (researchItem++->rawValue != researchItemEndMarker);
}

#pragma region Drag item

/**
 *
 *  rct2: 0x006852F4
 */
static void window_editor_inventions_list_drag_open(rct_research_item *researchItem)
{
    char buffer[256], *ptr;
    sint32 stringWidth;
    rct_window *w;

    window_close_by_class(WC_EDITOR_INVENTION_LIST_DRAG);
    _editorInventionsListDraggedItem = researchItem;
    rct_string_id stringId = research_item_get_name(researchItem);

    ptr = buffer;
    if (researchItem->type == RESEARCH_ENTRY_TYPE_RIDE && !RideGroupManager::RideTypeIsIndependent(researchItem->baseRideType))
    {
        const rct_string_id rideGroupName = get_ride_naming(researchItem->baseRideType, get_ride_entry(researchItem->entryIndex)).name;
        rct_string_id args[] = {
                rideGroupName,
                stringId
        };
        format_string(ptr, 256, STR_INVENTIONS_LIST_RIDE_AND_VEHICLE_NAME, &args);
    }
    else
    {
        format_string(ptr, 256, stringId, nullptr);
    }

    stringWidth = gfx_get_string_width(buffer);
    window_editor_inventions_list_drag_widgets[0].right = stringWidth;

    w = window_create(
        gTooltipCursorX - (stringWidth / 2),
        gTooltipCursorY - 7,
        stringWidth,
        14,
        &window_editor_inventions_list_drag_events,
        WC_EDITOR_INVENTION_LIST_DRAG,
        WF_STICK_TO_FRONT | WF_TRANSPARENT | WF_NO_SNAPPING
    );
    w->widgets = window_editor_inventions_list_drag_widgets;
    w->colours[1] = COLOUR_WHITE;
    input_window_position_begin(w, 0, gTooltipCursorX, gTooltipCursorY);
}

/**
 *
 *  rct2: 0x0068549C
 */
static void window_editor_inventions_list_drag_cursor(rct_window *w, rct_widgetindex widgetIndex, sint32 x, sint32 y, sint32 *cursorId)
{
    rct_window *inventionListWindow = window_find_by_class(WC_EDITOR_INVENTION_LIST);
    if (inventionListWindow != nullptr) {
        rct_research_item *researchItem = get_research_item_at(x, y);
        if (researchItem != inventionListWindow->research_item) {
            window_invalidate(inventionListWindow);
        }
    }

    *cursorId = CURSOR_HAND_CLOSED;
}

/**
 *
 *  rct2: 0x00685412
 */
static void window_editor_inventions_list_drag_moved(rct_window* w, sint32 x, sint32 y)
{
    rct_research_item *researchItem;

    researchItem = get_research_item_at(x, y);
    if (researchItem != nullptr)
        move_research_item(researchItem);

    window_close(w);
    _editorInventionsListDraggedItem = nullptr;
    window_invalidate_by_class(WC_EDITOR_INVENTION_LIST);
}

/**
 *
 *  rct2: 0x006853D9
 */
static void window_editor_inventions_list_drag_paint(rct_window *w, rct_drawpixelinfo *dpi)
{
    rct_string_id drawString;
    sint32 x, y;

    x = w->x;
    y = w->y + 2;
    drawString = window_editor_inventions_list_prepare_name(_editorInventionsListDraggedItem, true);
    gfx_draw_string_left(dpi, drawString, gCommonFormatArgs, COLOUR_BLACK | COLOUR_FLAG_OUTLINE, x, y);
}

static rct_string_id window_editor_inventions_list_prepare_name(const rct_research_item * researchItem, bool withGap)
{
    rct_string_id drawString;
    rct_string_id stringId = research_item_get_name(researchItem);

    if (researchItem->type == RESEARCH_ENTRY_TYPE_RIDE && !RideGroupManager::RideTypeIsIndependent(researchItem->baseRideType))
    {
        drawString = withGap ? STR_INVENTIONS_LIST_RIDE_AND_VEHICLE_NAME_DRAG : STR_WINDOW_COLOUR_2_STRINGID_STRINGID;
        rct_string_id rideGroupName = get_ride_naming(researchItem->baseRideType, get_ride_entry(researchItem->entryIndex)).name;
        set_format_arg(0, rct_string_id, rideGroupName);
        set_format_arg(2, rct_string_id, stringId);
    }
    else
    {
        drawString = STR_WINDOW_COLOUR_2_STRINGID;
        set_format_arg(0, rct_string_id, stringId);
    }

    return drawString;
}

#pragma endregion