Also scroll tile separators in the train depot

[openttd/fttd.git] / src / industry_gui.cpp

/* $Id$ */

/*
 * 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/>.
 */

/** @file industry_gui.cpp GUIs related to industries. */

#include "stdafx.h"
#include "error.h"
#include "gui.h"
#include "settings_gui.h"
#include "sound_func.h"
#include "window_func.h"
#include "textbuf_gui.h"
#include "command_func.h"
#include "viewport_func.h"
#include "industry.h"
#include "town.h"
#include "cheat_type.h"
#include "newgrf_industries.h"
#include "newgrf_text.h"
#include "newgrf_debug.h"
#include "network/network.h"
#include "strings_func.h"
#include "company_func.h"
#include "tilehighlight_func.h"
#include "string.h"
#include "sortlist_type.h"
#include "widgets/dropdown_func.h"
#include "company_base.h"
#include "core/geometry_func.hpp"
#include "core/random_func.hpp"
#include "core/backup_type.hpp"
#include "genworld.h"
#include "smallmap_gui.h"
#include "widgets/dropdown_type.h"
#include "widgets/industry_widget.h"

#include "table/strings.h"

#include <bitset>

bool _ignore_restrictions;
std::bitset<NUM_INDUSTRYTYPES> _displayed_industries; ///< Communication from the industry chain window to the smallmap window about what industries to display.

/** Cargo suffix type (for which window is it requested) */
enum CargoSuffixType {
        CST_FUND,  ///< Fund-industry window
        CST_VIEW,  ///< View-industry window
        CST_DIR,   ///< Industry-directory window
};

static void ShowIndustryCargoesWindow(IndustryType id);

/** Option flags for displaying accepted cargo in the industry view window. */
enum CargoSuffixFlags {
        CARGO_SUFFIX_FLAG_AMOUNT, ///< Display the amount of cargo.
        CARGO_SUFFIX_FLAG_TEXT,   ///< Display extra text.
};

/** Options for displaying accepted cargo in the industry view window. */
enum CargoSuffix {
        CARGO_SUFFIX_NONE        = 0,
        CARGO_SUFFIX_AMOUNT      = (1 << CARGO_SUFFIX_FLAG_AMOUNT),
        CARGO_SUFFIX_TEXT        = (1 << CARGO_SUFFIX_FLAG_TEXT),
        CARGO_SUFFIX_AMOUNT_TEXT = CARGO_SUFFIX_AMOUNT | CARGO_SUFFIX_TEXT,
};

/**
 * Gets the string to display after the cargo name for a given callback result.
 * @param suffix Buffer to which to append the suffix.
 * @param grffile GRF that defined the industry.
 * @param callback Result of callback 37.
 * @return Display option for the industry view window.
 */
static uint GetCargoSuffix (stringb *suffix, const GRFFile *grffile, uint16 callback)
{
        if (callback == CALLBACK_FAILED) return CARGO_SUFFIX_AMOUNT;

        bool valid;
        if (grffile->grf_version < 8) {
                if (GB(callback, 0, 8) == 0xFF) return CARGO_SUFFIX_AMOUNT;
                valid = (callback < 0x400);
        } else {
                if (callback == 0x400) return CARGO_SUFFIX_AMOUNT;
                if (callback == 0x401) return CARGO_SUFFIX_NONE;
                valid = ((callback & ~0x800) < 0x400);
        }

        if (valid) {
                StartTextRefStackUsage (grffile, 6);
                GetString (suffix, GetGRFStringID (grffile->grfid, 0xD000 + (callback & ~0x800)));
                StopTextRefStackUsage();
                return (callback & 0x800) != 0 ? CARGO_SUFFIX_TEXT : CARGO_SUFFIX_AMOUNT_TEXT;
        } else {
                ErrorUnknownCallbackResult (grffile->grfid, CBID_INDUSTRY_CARGO_SUFFIX, callback);
                return CARGO_SUFFIX_AMOUNT;
        }
}

/**
 * Gets the string to display after the cargo name (using callback 37)
 * @param cargo the cargo for which the suffix is requested
 * - 00 - first accepted cargo type
 * - 01 - second accepted cargo type
 * - 02 - third accepted cargo type
 * - 03 - first produced cargo type
 * - 04 - second produced cargo type
 * @param cst the cargo suffix type (for which window is it requested). @see CargoSuffixType
 * @param ind the industry (NULL if in fund window)
 * @param ind_type the industry type
 * @param indspec the industry spec
 * @param suffix is filled with the string to display
 * @return Display option for the industry view window.
 */
static inline uint GetCargoSuffix (uint cargo, CargoSuffixType cst,
        const Industry *ind, IndustryType ind_type,
        const IndustrySpec *indspec, stringb *suffix)
{
        suffix->clear();

        if (!HasBit(indspec->callback_mask, CBM_IND_CARGO_SUFFIX)) {
                return CARGO_SUFFIX_AMOUNT;
        }

        uint16 callback = GetIndustryCallback (CBID_INDUSTRY_CARGO_SUFFIX, 0,
                        (cst << 8) | cargo, const_cast<Industry *>(ind), ind_type,
                        (cst != CST_FUND) ? ind->location.tile : INVALID_TILE);
        return GetCargoSuffix (suffix, indspec->grf_prop.grffile, callback);
}

/**
 * Set up the string parameters for an array of cargoes.
 * @param buffer The buffer where to store the cargo suffixes, if any.
 * @param i The industry (NULL if in fund window).
 * @param type The industry type.
 * @param spec The industry spec.
 * @param n The number of cargoes in the array.
 * @param c The array of cargoes.
 * @param cst The cargo suffix type (for which window it is requested).
 * @param offset Cargo offset for the callback (0 for accepts, 3 for production).
 * @return The number of valid cargoes found.
 */
static uint SetupCargoArrayParams (sstring<512> (&buffer) [3],
        const Industry *i, IndustryType type, const IndustrySpec *spec,
        uint n, const CargoID *c, CargoSuffixType cst, uint offset)
{
        assert (n <= lengthof(buffer));
        uint p = 0;
        for (uint j = 0; j < n; j++) {
                if (c[j] == CT_INVALID) continue;
                GetCargoSuffix (j + offset, cst, i, type, spec, &buffer[j]);
                SetDParam (p++, CargoSpec::Get(c[j])->name);
                SetDParamStr (p++, buffer[j].c_str());
        }
        return p / 2;
}

/**
 * Set up the string parameters for an array of cargoes.
 * @param buffer The buffer where to store the cargo suffixes, if any.
 * @param i The industry (NULL if in fund window).
 * @param type The industry type.
 * @param spec The industry spec.
 * @param c The array of cargoes.
 * @param cst The cargo suffix type (for which window it is requested).
 * @param offset Cargo offset for the callback (0 for accepts, 3 for production).
 * @return The number of valid cargoes found.
 */
template <uint N>
static inline uint SetupCargoArrayParams (sstring<512> (&buffer) [3],
        const Industry *i, IndustryType type, const IndustrySpec *spec,
        const CargoID (&c) [N], CargoSuffixType cst, uint offset)
{
        return SetupCargoArrayParams (buffer, i, type, spec, N, &c[0],
                                        cst, offset);
}

/**
 * Set up the string parameters for the accepted cargoes of an industry.
 * @param buffer The buffer where to store the cargo suffixes, if any.
 * @param type The industry type.
 * @param spec The industry spec.
 * @return The string to use.
 */
static StringID SetupAcceptedCargoParams (sstring<512> (&buffer) [3],
        IndustryType type, const IndustrySpec *spec)
{
        static const StringID str = STR_INDUSTRY_VIEW_REQUIRES_CARGO;

        uint p = SetupCargoArrayParams (buffer, NULL, type, spec,
                                        spec->accepts_cargo, CST_FUND, 0);
        if (p > 0) return str + p - 1;

        SetDParam (0, STR_JUST_NOTHING);
        SetDParamStr (1, "");
        return str;
}

/**
 * Set up the string parameters for the produced cargoes of an industry.
 * @param buffer The buffer where to store the cargo suffixes, if any.
 * @param type The industry type.
 * @param spec The industry spec.
 * @return The string to use.
 */
static StringID SetupProducedCargoParams (sstring<512> (&buffer) [3],
        IndustryType type, const IndustrySpec *spec)
{
        static const StringID str = STR_INDUSTRY_VIEW_PRODUCES_CARGO;

        uint p = SetupCargoArrayParams (buffer, NULL, type, spec,
                                        spec->produced_cargo, CST_FUND, 3);
        if (p > 0) return str + p - 1;

        SetDParam (0, STR_JUST_NOTHING);
        SetDParamStr (1, "");
        return str;
}

IndustryType _sorted_industry_types[NUM_INDUSTRYTYPES]; ///< Industry types sorted by name.

/** Sort industry types by their name. */
static int CDECL IndustryTypeNameSorter(const IndustryType *a, const IndustryType *b)
{
        static char industry_name[2][64];

        const IndustrySpec *indsp1 = GetIndustrySpec(*a);
        GetString (industry_name[0], indsp1->name);

        const IndustrySpec *indsp2 = GetIndustrySpec(*b);
        GetString (industry_name[1], indsp2->name);

        int r = strnatcmp(industry_name[0], industry_name[1]); // Sort by name (natural sorting).

        /* If the names are equal, sort by industry type. */
        return (r != 0) ? r : (*a - *b);
}

/**
 * Initialize the list of sorted industry types.
 */
void SortIndustryTypes()
{
        /* Add each industry type to the list. */
        for (IndustryType i = 0; i < NUM_INDUSTRYTYPES; i++) {
                _sorted_industry_types[i] = i;
        }

        /* Sort industry types by name. */
        QSortT(_sorted_industry_types, NUM_INDUSTRYTYPES, &IndustryTypeNameSorter);
}

/**
 * Command callback. In case of failure to build an industry, show an error message.
 * @param result Result of the command.
 * @param tile   Tile where the industry is placed.
 * @param p1     Additional data of the #CMD_BUILD_INDUSTRY command.
 * @param p2     Additional data of the #CMD_BUILD_INDUSTRY command.
 */
void CcBuildIndustry(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2)
{
        if (result.Succeeded()) return;

        if (_game_mode != GM_EDITOR) return;

        uint8 indtype = GB(p1, 0, 8);
        if (indtype < NUM_INDUSTRYTYPES) {
                const IndustrySpec *indsp = GetIndustrySpec(indtype);
                if (indsp->enabled) {
                        SetDParam(0, indsp->name);
                        ShowErrorMessage(STR_ERROR_CAN_T_BUILD_HERE, result.GetErrorMessage(), WL_INFO, TileX(tile) * TILE_SIZE, TileY(tile) * TILE_SIZE);
                }
        }
}

static const NWidgetPart _nested_build_industry_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_DARK_GREEN),
                NWidget(WWT_CAPTION, COLOUR_DARK_GREEN), SetDataTip(STR_FUND_INDUSTRY_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_DARK_GREEN),
                NWidget(WWT_DEFSIZEBOX, COLOUR_DARK_GREEN),
                NWidget(WWT_STICKYBOX, COLOUR_DARK_GREEN),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_MATRIX, COLOUR_DARK_GREEN, WID_DPI_MATRIX_WIDGET), SetMatrixDataTip(1, 0, STR_FUND_INDUSTRY_SELECTION_TOOLTIP), SetFill(1, 0), SetResize(1, 1), SetScrollbar(WID_DPI_SCROLLBAR),
                NWidget(NWID_VSCROLLBAR, COLOUR_DARK_GREEN, WID_DPI_SCROLLBAR),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_DARK_GREEN, WID_DPI_INFOPANEL), SetResize(1, 0),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_TEXTBTN, COLOUR_DARK_GREEN, WID_DPI_DISPLAY_WIDGET), SetFill(1, 0), SetResize(1, 0),
                                SetDataTip(STR_INDUSTRY_DISPLAY_CHAIN, STR_INDUSTRY_DISPLAY_CHAIN_TOOLTIP),
                NWidget(WWT_TEXTBTN, COLOUR_DARK_GREEN, WID_DPI_FUND_WIDGET), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_JUST_STRING, STR_NULL),
                NWidget(WWT_RESIZEBOX, COLOUR_DARK_GREEN),
        EndContainer(),
};

/** Window preferences of the dynamic place industries gui */
static WindowDesc::Prefs _build_industry_prefs ("build_industry");

/** Window definition of the dynamic place industries gui */
static const WindowDesc _build_industry_desc(
        WDP_AUTO, 170, 212,
        WC_BUILD_INDUSTRY, WC_NONE,
        WDF_CONSTRUCTION,
        _nested_build_industry_widgets, lengthof(_nested_build_industry_widgets),
        &_build_industry_prefs
);

/** Build (fund or prospect) a new industry, */
class BuildIndustryWindow : public Window {
        int selected_index;                         ///< index of the element in the matrix
        IndustryType selected_type;                 ///< industry corresponding to the above index
        uint16 callback_timer;                      ///< timer counter for callback eventual verification
        bool timer_enabled;                         ///< timer can be used
        uint16 count;                               ///< How many industries are loaded
        IndustryType index[NUM_INDUSTRYTYPES + 1];  ///< Type of industry, in the order it was loaded
        bool enabled[NUM_INDUSTRYTYPES + 1];        ///< availability state, coming from CBID_INDUSTRY_PROBABILITY (if ever)
        Scrollbar *vscroll;

        /** The offset for the text in the matrix. */
        static const int MATRIX_TEXT_OFFSET = 17;

        void SetupArrays()
        {
                this->count = 0;

                for (uint i = 0; i < lengthof(this->index); i++) {
                        this->index[i]   = INVALID_INDUSTRYTYPE;
                        this->enabled[i] = false;
                }

                if (_game_mode == GM_EDITOR) { // give room for the Many Random "button"
                        this->index[this->count] = INVALID_INDUSTRYTYPE;
                        this->enabled[this->count] = true;
                        this->count++;
                        this->timer_enabled = false;
                }
                /* Fill the arrays with industries.
                 * The tests performed after the enabled allow to load the industries
                 * In the same way they are inserted by grf (if any)
                 */
                for (uint i = 0; i < NUM_INDUSTRYTYPES; i++) {
                        IndustryType ind = _sorted_industry_types[i];
                        const IndustrySpec *indsp = GetIndustrySpec(ind);
                        if (indsp->enabled) {
                                /* Rule is that editor mode loads all industries.
                                 * In game mode, all non raw industries are loaded too
                                 * and raw ones are loaded only when setting allows it */
                                if (_game_mode != GM_EDITOR && indsp->IsRawIndustry() && _settings_game.construction.raw_industry_construction == 0) {
                                        /* Unselect if the industry is no longer in the list */
                                        if (this->selected_type == ind) this->selected_index = -1;
                                        continue;
                                }
                                this->index[this->count] = ind;
                                this->enabled[this->count] = (_game_mode == GM_EDITOR) || GetIndustryProbabilityCallback(ind, IACT_USERCREATION, 1) > 0;
                                /* Keep the selection to the correct line */
                                if (this->selected_type == ind) this->selected_index = this->count;
                                this->count++;
                        }
                }

                /* first industry type is selected if the current selection is invalid.
                 * I'll be damned if there are none available ;) */
                if (this->selected_index == -1) {
                        this->selected_index = 0;
                        this->selected_type = this->index[0];
                }

                this->vscroll->SetCount(this->count);
        }

        /** Update status of the fund and display-chain widgets. */
        void SetButtons()
        {
                this->SetWidgetDisabledState(WID_DPI_FUND_WIDGET, this->selected_type != INVALID_INDUSTRYTYPE && !this->enabled[this->selected_index]);
                this->SetWidgetDisabledState(WID_DPI_DISPLAY_WIDGET, this->selected_type == INVALID_INDUSTRYTYPE && this->enabled[this->selected_index]);
        }

public:
        BuildIndustryWindow() : Window (&_build_industry_desc),
                selected_index (-1),
                selected_type (INVALID_INDUSTRYTYPE),
                callback_timer (DAY_TICKS),
                timer_enabled (_loaded_newgrf_features.has_newindustries),
                count (0), vscroll (NULL)
        {
                memset (this->index, 0, sizeof(this->index));
                memset (this->enabled, 0, sizeof(this->enabled));

                this->CreateNestedTree();
                this->vscroll = this->GetScrollbar(WID_DPI_SCROLLBAR);
                this->InitNested(0);

                this->SetButtons();
        }

        virtual void OnInit()
        {
                this->SetupArrays();
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                switch (widget) {
                        case WID_DPI_MATRIX_WIDGET: {
                                Dimension d = GetStringBoundingBox(STR_FUND_INDUSTRY_MANY_RANDOM_INDUSTRIES);
                                for (byte i = 0; i < this->count; i++) {
                                        if (this->index[i] == INVALID_INDUSTRYTYPE) continue;
                                        d = maxdim(d, GetStringBoundingBox(GetIndustrySpec(this->index[i])->name));
                                }
                                resize->height = FONT_HEIGHT_NORMAL + WD_MATRIX_TOP + WD_MATRIX_BOTTOM;
                                d.width += MATRIX_TEXT_OFFSET + padding.width;
                                d.height = 5 * resize->height;
                                *size = maxdim(*size, d);
                                break;
                        }

                        case WID_DPI_INFOPANEL: {
                                /* Extra line for cost outside of editor + extra lines for 'extra' information for NewGRFs. */
                                int height = 2 + (_game_mode == GM_EDITOR ? 0 : 1) + (_loaded_newgrf_features.has_newindustries ? 4 : 0);
                                Dimension d = {0, 0};
                                for (byte i = 0; i < this->count; i++) {
                                        if (this->index[i] == INVALID_INDUSTRYTYPE) continue;

                                        const IndustrySpec *indsp = GetIndustrySpec(this->index[i]);

                                        sstring<512> cargo_suffix [3];
                                        StringID str = SetupAcceptedCargoParams (cargo_suffix,
                                                        this->index[i], indsp);
                                        d = maxdim(d, GetStringBoundingBox(str));

                                        /* Draw the produced cargoes, if any. Otherwise, will print "Nothing". */
                                        str = SetupProducedCargoParams (cargo_suffix,
                                                        this->index[i], indsp);
                                        d = maxdim(d, GetStringBoundingBox(str));
                                }

                                /* Set it to something more sane :) */
                                size->height = height * FONT_HEIGHT_NORMAL + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
                                size->width  = d.width + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                break;
                        }

                        case WID_DPI_FUND_WIDGET: {
                                Dimension d = GetStringBoundingBox(STR_FUND_INDUSTRY_BUILD_NEW_INDUSTRY);
                                d = maxdim(d, GetStringBoundingBox(STR_FUND_INDUSTRY_PROSPECT_NEW_INDUSTRY));
                                d = maxdim(d, GetStringBoundingBox(STR_FUND_INDUSTRY_FUND_NEW_INDUSTRY));
                                d.width += padding.width;
                                d.height += padding.height;
                                *size = maxdim(*size, d);
                                break;
                        }
                }
        }

        virtual void SetStringParameters(int widget) const
        {
                switch (widget) {
                        case WID_DPI_FUND_WIDGET:
                                /* Raw industries might be prospected. Show this fact by changing the string
                                 * In Editor, you just build, while ingame, or you fund or you prospect */
                                if (_game_mode == GM_EDITOR) {
                                        /* We've chosen many random industries but no industries have been specified */
                                        SetDParam(0, STR_FUND_INDUSTRY_BUILD_NEW_INDUSTRY);
                                } else {
                                        const IndustrySpec *indsp = GetIndustrySpec(this->index[this->selected_index]);
                                        SetDParam(0, (_settings_game.construction.raw_industry_construction == 2 && indsp->IsRawIndustry()) ? STR_FUND_INDUSTRY_PROSPECT_NEW_INDUSTRY : STR_FUND_INDUSTRY_FUND_NEW_INDUSTRY);
                                }
                                break;
                }
        }

        void DrawWidget (BlitArea *dpi, const Rect &r, int widget) const OVERRIDE
        {
                switch (widget) {
                        case WID_DPI_MATRIX_WIDGET: {
                                uint text_left, text_right, icon_left, icon_right;
                                if (_current_text_dir == TD_RTL) {
                                        icon_right = r.right    - WD_MATRIX_RIGHT;
                                        icon_left  = icon_right - 10;
                                        text_right = icon_right - BuildIndustryWindow::MATRIX_TEXT_OFFSET;
                                        text_left  = r.left     + WD_MATRIX_LEFT;
                                } else {
                                        icon_left  = r.left     + WD_MATRIX_LEFT;
                                        icon_right = icon_left  + 10;
                                        text_left  = icon_left  + BuildIndustryWindow::MATRIX_TEXT_OFFSET;
                                        text_right = r.right    - WD_MATRIX_RIGHT;
                                }

                                for (byte i = 0; i < this->vscroll->GetCapacity() && i + this->vscroll->GetPosition() < this->count; i++) {
                                        int y = r.top + WD_MATRIX_TOP + i * this->resize.step_height;
                                        bool selected = this->selected_index == i + this->vscroll->GetPosition();

                                        if (this->index[i + this->vscroll->GetPosition()] == INVALID_INDUSTRYTYPE) {
                                                DrawString (dpi, text_left, text_right, y, STR_FUND_INDUSTRY_MANY_RANDOM_INDUSTRIES, selected ? TC_WHITE : TC_ORANGE);
                                                continue;
                                        }
                                        const IndustrySpec *indsp = GetIndustrySpec(this->index[i + this->vscroll->GetPosition()]);

                                        /* Draw the name of the industry in white is selected, otherwise, in orange */
                                        DrawString (dpi, text_left, text_right, y, indsp->name, selected ? TC_WHITE : TC_ORANGE);
                                        GfxFillRect (dpi, icon_left,     y + 1, icon_right,     y + 7, selected ? PC_WHITE : PC_BLACK);
                                        GfxFillRect (dpi, icon_left + 1, y + 2, icon_right - 1, y + 6, indsp->map_colour);
                                }
                                break;
                        }

                        case WID_DPI_INFOPANEL: {
                                int y      = r.top    + WD_FRAMERECT_TOP;
                                int bottom = r.bottom - WD_FRAMERECT_BOTTOM;
                                int left   = r.left   + WD_FRAMERECT_LEFT;
                                int right  = r.right  - WD_FRAMERECT_RIGHT;

                                if (this->selected_type == INVALID_INDUSTRYTYPE) {
                                        DrawStringMultiLine (dpi, left, right, y,  bottom, STR_FUND_INDUSTRY_MANY_RANDOM_INDUSTRIES_TOOLTIP);
                                        break;
                                }

                                const IndustrySpec *indsp = GetIndustrySpec(this->selected_type);

                                if (_game_mode != GM_EDITOR) {
                                        SetDParam(0, indsp->GetConstructionCost());
                                        DrawString (dpi, left, right, y, STR_FUND_INDUSTRY_INDUSTRY_BUILD_COST);
                                        y += FONT_HEIGHT_NORMAL;
                                }

                                /* Draw the accepted cargoes, if any. Otherwise, will print "Nothing". */
                                sstring<512> cargo_suffix [3];
                                StringID str = SetupAcceptedCargoParams (cargo_suffix,
                                                this->selected_type, indsp);
                                DrawString (dpi, left, right, y, str);
                                y += FONT_HEIGHT_NORMAL;

                                /* Draw the produced cargoes, if any. Otherwise, will print "Nothing". */
                                str = SetupProducedCargoParams (cargo_suffix,
                                                this->selected_type, indsp);
                                DrawString (dpi, left, right, y, str);
                                y += FONT_HEIGHT_NORMAL;

                                /* Get the additional purchase info text, if it has not already been queried. */
                                str = STR_NULL;
                                if (HasBit(indsp->callback_mask, CBM_IND_FUND_MORE_TEXT)) {
                                        uint16 callback_res = GetIndustryCallback(CBID_INDUSTRY_FUND_MORE_TEXT, 0, 0, NULL, this->selected_type, INVALID_TILE);
                                        if (callback_res != CALLBACK_FAILED && callback_res != 0x400) {
                                                if (callback_res > 0x400) {
                                                        ErrorUnknownCallbackResult(indsp->grf_prop.grffile->grfid, CBID_INDUSTRY_FUND_MORE_TEXT, callback_res);
                                                } else {
                                                        str = GetGRFStringID(indsp->grf_prop.grffile->grfid, 0xD000 + callback_res);  // No. here's the new string
                                                        if (str != STR_UNDEFINED) {
                                                                StartTextRefStackUsage(indsp->grf_prop.grffile, 6);
                                                                DrawStringMultiLine (dpi, left, right, y, bottom, str, TC_YELLOW);
                                                                StopTextRefStackUsage();
                                                        }
                                                }
                                        }
                                }
                                break;
                        }
                }
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                switch (widget) {
                        case WID_DPI_MATRIX_WIDGET: {
                                int y = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_DPI_MATRIX_WIDGET);
                                if (y < this->count) { // Is it within the boundaries of available data?
                                        this->selected_index = y;
                                        this->selected_type = this->index[y];
                                        const IndustrySpec *indsp = (this->selected_type == INVALID_INDUSTRYTYPE) ? NULL : GetIndustrySpec(this->selected_type);

                                        this->SetDirty();

                                        if (_thd.GetCallbackWnd() == this &&
                                                        ((_game_mode != GM_EDITOR && _settings_game.construction.raw_industry_construction == 2 && indsp != NULL && indsp->IsRawIndustry()) ||
                                                        this->selected_type == INVALID_INDUSTRYTYPE ||
                                                        !this->enabled[this->selected_index])) {
                                                /* Reset the button state if going to prospecting or "build many industries" */
                                                this->RaiseButtons();
                                                ResetPointerMode();
                                        }

                                        this->SetButtons();
                                        if (this->enabled[this->selected_index] && click_count > 1) this->OnClick(pt, WID_DPI_FUND_WIDGET, 1);
                                }
                                break;
                        }

                        case WID_DPI_DISPLAY_WIDGET:
                                if (this->selected_type != INVALID_INDUSTRYTYPE) ShowIndustryCargoesWindow(this->selected_type);
                                break;

                        case WID_DPI_FUND_WIDGET: {
                                if (this->selected_type == INVALID_INDUSTRYTYPE) {
                                        this->HandleButtonClick(WID_DPI_FUND_WIDGET);

                                        if (Town::GetNumItems() == 0) {
                                                ShowErrorMessage(STR_ERROR_CAN_T_GENERATE_INDUSTRIES, STR_ERROR_MUST_FOUND_TOWN_FIRST, WL_INFO);
                                        } else {
                                                extern void GenerateIndustries();
                                                _generating_world = true;
                                                GenerateIndustries();
                                                _generating_world = false;
                                        }
                                } else if (_game_mode != GM_EDITOR && _settings_game.construction.raw_industry_construction == 2 && GetIndustrySpec(this->selected_type)->IsRawIndustry()) {
                                        DoCommandP(0, this->selected_type, InteractiveRandom(), CMD_BUILD_INDUSTRY);
                                        this->HandleButtonClick(WID_DPI_FUND_WIDGET);
                                } else {
                                        HandlePlacePushButton (this, WID_DPI_FUND_WIDGET, SPR_CURSOR_INDUSTRY, POINTER_TILE);
                                }
                                break;
                        }
                }
        }

        virtual void OnResize()
        {
                /* Adjust the number of items in the matrix depending of the resize */
                this->vscroll->SetCapacityFromWidget(this, WID_DPI_MATRIX_WIDGET);
        }

        virtual void OnPlaceObject(Point pt, TileIndex tile)
        {
                bool success = true;
                /* We do not need to protect ourselves against "Random Many Industries" in this mode */
                const IndustrySpec *indsp = GetIndustrySpec(this->selected_type);
                uint32 seed = InteractiveRandom();

                if (_game_mode == GM_EDITOR) {
                        /* Show error if no town exists at all */
                        if (Town::GetNumItems() == 0) {
                                SetDParam(0, indsp->name);
                                ShowErrorMessage(STR_ERROR_CAN_T_BUILD_HERE, STR_ERROR_MUST_FOUND_TOWN_FIRST, WL_INFO, pt.x, pt.y);
                                return;
                        }

                        Backup<CompanyByte> cur_company(_current_company, OWNER_NONE, FILE_LINE);
                        _generating_world = true;
                        _ignore_restrictions = true;

                        DoCommandP(tile, (InteractiveRandomRange(indsp->num_table) << 8) | this->selected_type, seed, CMD_BUILD_INDUSTRY);

                        cur_company.Restore();
                        _ignore_restrictions = false;
                        _generating_world = false;
                } else {
                        success = DoCommandP(tile, (InteractiveRandomRange(indsp->num_table) << 8) | this->selected_type, seed, CMD_BUILD_INDUSTRY);
                }

                /* If an industry has been built, just reset the cursor and the system */
                if (success && !_settings_client.gui.persistent_buildingtools) ResetPointerMode();
        }

        virtual void OnTick()
        {
                if (_pause_mode != PM_UNPAUSED) return;
                if (!this->timer_enabled) return;
                if (--this->callback_timer == 0) {
                        /* We have just passed another day.
                         * See if we need to update availability of currently selected industry */
                        this->callback_timer = DAY_TICKS; // restart counter

                        const IndustrySpec *indsp = GetIndustrySpec(this->selected_type);

                        if (indsp->enabled) {
                                bool call_back_result = GetIndustryProbabilityCallback(this->selected_type, IACT_USERCREATION, 1) > 0;

                                /* Only if result does match the previous state would it require a redraw. */
                                if (call_back_result != this->enabled[this->selected_index]) {
                                        this->enabled[this->selected_index] = call_back_result;
                                        this->SetButtons();
                                        this->SetDirty();
                                }
                        }
                }
        }

        virtual void OnTimeout()
        {
                this->RaiseButtons();
        }

        virtual void OnPlaceObjectAbort()
        {
                this->RaiseButtons();
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
        {
                if (!gui_scope) return;
                this->SetupArrays();

                const IndustrySpec *indsp = (this->selected_type == INVALID_INDUSTRYTYPE) ? NULL : GetIndustrySpec(this->selected_type);
                if (indsp == NULL) this->enabled[this->selected_index] = _settings_game.difficulty.industry_density != ID_FUND_ONLY;
                this->SetButtons();
        }
};

void ShowBuildIndustryWindow()
{
        if (_game_mode != GM_EDITOR && !Company::IsValidID(_local_company)) return;
        if (BringWindowToFrontById(WC_BUILD_INDUSTRY, 0)) return;
        new BuildIndustryWindow();
}

static void UpdateIndustryProduction(Industry *i);

static inline bool IsProductionAlterable(const Industry *i)
{
        const IndustrySpec *is = GetIndustrySpec(i->type);
        return ((_game_mode == GM_EDITOR || _cheats.setup_prod.value) &&
                        (is->production_rate[0] != 0 || is->production_rate[1] != 0 || is->IsRawIndustry()) &&
                        !_networking);
}

class IndustryViewWindow : public Window
{
        /** Modes for changing production */
        enum Editability {
                EA_NONE,              ///< Not alterable
                EA_MULTIPLIER,        ///< Allow changing the production multiplier
                EA_RATE,              ///< Allow changing the production rates
        };

        /** Specific lines in the info panel */
        enum InfoLine {
                IL_NONE,              ///< No line
                IL_MULTIPLIER,        ///< Production multiplier
                IL_RATE1,             ///< Production rate of cargo 1
                IL_RATE2,             ///< Production rate of cargo 2
        };

        Editability editable;     ///< Mode for changing production
        InfoLine editbox_line;    ///< The line clicked to open the edit box
        InfoLine clicked_line;    ///< The line of the button that has been clicked
        byte clicked_button;      ///< The button that has been clicked (to raise)
        int production_offset_y;  ///< The offset of the production texts/buttons
        int info_height;          ///< Height needed for the #WID_IV_INFO panel

public:
        IndustryViewWindow (const WindowDesc *desc, WindowNumber window_number)
                : Window (desc), editable (EA_NONE),
                  editbox_line (IL_NONE), clicked_line (IL_NONE),
                  clicked_button (0), production_offset_y (0),
                  info_height (WD_FRAMERECT_TOP + 2 * FONT_HEIGHT_NORMAL + WD_FRAMERECT_BOTTOM + 1) // Info panel has at least two lines text.
        {
                this->flags |= WF_DISABLE_VP_SCROLL;

                this->InitNested(window_number);
                NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_IV_VIEWPORT);
                nvp->InitializeViewport(this, Industry::Get(window_number)->location.GetCenterTile(), ZOOM_LVL_INDUSTRY);

                this->InvalidateData();
        }

        void OnPaint (BlitArea *dpi) OVERRIDE
        {
                this->DrawWidgets (dpi);

                if (this->IsShaded()) return; // Don't draw anything when the window is shaded.

                NWidgetBase *nwi = this->GetWidget<NWidgetBase>(WID_IV_INFO);
                uint expected = this->DrawInfo (dpi, nwi->pos_x, nwi->pos_x + nwi->current_x - 1, nwi->pos_y) - nwi->pos_y;
                if (expected > nwi->current_y - 1) {
                        this->info_height = expected + 1;
                        this->ReInit();
                        return;
                }
        }

        /**
         * Draw the text in the #WID_IV_INFO panel.
         * @param dpi   Area to draw on.
         * @param left  Left edge of the panel.
         * @param right Right edge of the panel.
         * @param top   Top edge of the panel.
         * @return Expected position of the bottom edge of the panel.
         */
        int DrawInfo (BlitArea *dpi, uint left, uint right, uint top)
        {
                Industry *i = Industry::Get(this->window_number);
                const IndustrySpec *ind = GetIndustrySpec(i->type);
                int y = top + WD_FRAMERECT_TOP;
                bool has_accept = false;
                sstring<512> cargo_suffix [3];

                if (i->prod_level == PRODLEVEL_CLOSURE) {
                        DrawString (dpi, left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, y, STR_INDUSTRY_VIEW_INDUSTRY_ANNOUNCED_CLOSURE);
                        y += 2 * FONT_HEIGHT_NORMAL;
                }

                bool stockpiling = HasBit(ind->callback_mask, CBM_IND_PRODUCTION_CARGO_ARRIVAL)
                                || HasBit(ind->callback_mask, CBM_IND_PRODUCTION_256_TICKS);
                bool has_suffix  = HasBit(ind->callback_mask, CBM_IND_CARGO_SUFFIX);

                if (stockpiling || has_suffix) {
                        for (byte j = 0; j < lengthof(i->accepts_cargo); j++) {
                                if (i->accepts_cargo[j] == CT_INVALID) continue;
                                if (!has_accept) {
                                        DrawString (dpi, left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, y, STR_INDUSTRY_VIEW_REQUIRES);
                                        y += FONT_HEIGHT_NORMAL;
                                        has_accept = true;
                                }

                                uint opt;
                                if (!has_suffix) {
                                        opt = CARGO_SUFFIX_AMOUNT;
                                } else {
                                        opt = GetCargoSuffix (j, CST_VIEW, i, i->type, ind, &cargo_suffix[j]);
                                        if ((opt == CARGO_SUFFIX_AMOUNT) && !stockpiling) {
                                                opt = CARGO_SUFFIX_NONE;
                                        }
                                }

                                byte p;
                                if (HasBit (opt, CARGO_SUFFIX_FLAG_AMOUNT)) {
                                        SetDParam (0, i->accepts_cargo[j]);
                                        SetDParam (1, i->incoming_cargo_waiting[j]);
                                        p = 2;
                                } else {
                                        SetDParam (0, CargoSpec::Get(i->accepts_cargo[j])->name);
                                        p = 1;
                                }
                                if (HasBit (opt, CARGO_SUFFIX_FLAG_TEXT)) {
                                        SetDParamStr (p, cargo_suffix[j].c_str());
                                }

                                assert_compile (STR_INDUSTRY_VIEW_ACCEPT_CARGO + CARGO_SUFFIX_NONE        == STR_INDUSTRY_VIEW_ACCEPT_CARGO);
                                assert_compile (STR_INDUSTRY_VIEW_ACCEPT_CARGO + CARGO_SUFFIX_AMOUNT      == STR_INDUSTRY_VIEW_ACCEPT_CARGO_AMOUNT);
                                assert_compile (STR_INDUSTRY_VIEW_ACCEPT_CARGO + CARGO_SUFFIX_TEXT        == STR_INDUSTRY_VIEW_ACCEPT_CARGO_TEXT);
                                assert_compile (STR_INDUSTRY_VIEW_ACCEPT_CARGO + CARGO_SUFFIX_AMOUNT_TEXT == STR_INDUSTRY_VIEW_ACCEPT_CARGO_AMOUNT_TEXT);

                                StringID str = STR_INDUSTRY_VIEW_ACCEPT_CARGO + opt;
                                DrawString (dpi, left + WD_FRAMETEXT_LEFT, right - WD_FRAMERECT_RIGHT, y, str);
                                y += FONT_HEIGHT_NORMAL;
                        }
                } else {
                        uint p = SetupCargoArrayParams (cargo_suffix, i, i->type,
                                        ind, i->accepts_cargo, CST_VIEW, 0);
                        has_accept = (p > 0);
                        if (has_accept) {
                                StringID str = STR_INDUSTRY_VIEW_REQUIRES_CARGO + p - 1;
                                DrawString (dpi, left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, y, str);
                                y += FONT_HEIGHT_NORMAL;
                        }
                }

                bool first = true;
                assert_compile(lengthof(i->produced_cargo) <= lengthof(cargo_suffix));
                for (byte j = 0; j < lengthof(i->produced_cargo); j++) {
                        if (i->produced_cargo[j] == CT_INVALID) continue;
                        if (first) {
                                if (has_accept) y += WD_PAR_VSEP_WIDE;
                                DrawString (dpi, left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, y, STR_INDUSTRY_VIEW_PRODUCTION_LAST_MONTH_TITLE);
                                y += FONT_HEIGHT_NORMAL;
                                if (this->editable == EA_RATE) this->production_offset_y = y;
                                first = false;
                        }

                        GetCargoSuffix (j + 3, CST_VIEW, i, i->type, ind, &cargo_suffix[j]);
                        SetDParam(0, i->produced_cargo[j]);
                        SetDParam(1, i->last_month_production[j]);
                        SetDParamStr(2, cargo_suffix[j].c_str());
                        SetDParam(3, ToPercent8(i->last_month_pct_transported[j]));
                        uint x = left + WD_FRAMETEXT_LEFT + (this->editable == EA_RATE ? SETTING_BUTTON_WIDTH + 10 : 0);
                        DrawString (dpi, x, right - WD_FRAMERECT_RIGHT, y, STR_INDUSTRY_VIEW_TRANSPORTED);
                        /* Let's put out those buttons.. */
                        if (this->editable == EA_RATE) {
                                DrawArrowButtons (dpi, left + WD_FRAMETEXT_LEFT, y, COLOUR_YELLOW, (this->clicked_line == IL_RATE1 + j) ? this->clicked_button : 0,
                                                i->production_rate[j] > 0, i->production_rate[j] < 255);
                        }
                        y += FONT_HEIGHT_NORMAL;
                }

                /* Display production multiplier if editable */
                if (this->editable == EA_MULTIPLIER) {
                        y += WD_PAR_VSEP_WIDE;
                        this->production_offset_y = y;
                        SetDParam(0, RoundDivSU(i->prod_level * 100, PRODLEVEL_DEFAULT));
                        uint x = left + WD_FRAMETEXT_LEFT + SETTING_BUTTON_WIDTH + 10;
                        DrawString (dpi, x, right - WD_FRAMERECT_RIGHT, y, STR_INDUSTRY_VIEW_PRODUCTION_LEVEL);
                        DrawArrowButtons (dpi, left + WD_FRAMETEXT_LEFT, y, COLOUR_YELLOW, (this->clicked_line == IL_MULTIPLIER) ? this->clicked_button : 0,
                                        i->prod_level > PRODLEVEL_MINIMUM, i->prod_level < PRODLEVEL_MAXIMUM);
                        y += FONT_HEIGHT_NORMAL;
                }

                /* Get the extra message for the GUI */
                if (HasBit(ind->callback_mask, CBM_IND_WINDOW_MORE_TEXT)) {
                        uint16 callback_res = GetIndustryCallback(CBID_INDUSTRY_WINDOW_MORE_TEXT, 0, 0, i, i->type, i->location.tile);
                        if (callback_res != CALLBACK_FAILED && callback_res != 0x400) {
                                if (callback_res > 0x400) {
                                        ErrorUnknownCallbackResult(ind->grf_prop.grffile->grfid, CBID_INDUSTRY_WINDOW_MORE_TEXT, callback_res);
                                } else {
                                        StringID message = GetGRFStringID(ind->grf_prop.grffile->grfid, 0xD000 + callback_res);
                                        if (message != STR_NULL && message != STR_UNDEFINED) {
                                                y += WD_PAR_VSEP_WIDE;

                                                StartTextRefStackUsage(ind->grf_prop.grffile, 6);
                                                /* Use all the available space left from where we stand up to the
                                                 * end of the window. We ALSO enlarge the window if needed, so we
                                                 * can 'go' wild with the bottom of the window. */
                                                y = DrawStringMultiLine (dpi, left + WD_FRAMERECT_LEFT, right - WD_FRAMERECT_RIGHT, y, UINT16_MAX, message, TC_BLACK);
                                                StopTextRefStackUsage();
                                        }
                                }
                        }
                }
                return y + WD_FRAMERECT_BOTTOM;
        }

        virtual void SetStringParameters(int widget) const
        {
                if (widget == WID_IV_CAPTION) SetDParam(0, this->window_number);
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                if (widget == WID_IV_INFO) size->height = this->info_height;
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                switch (widget) {
                        case WID_IV_INFO: {
                                Industry *i = Industry::Get(this->window_number);
                                InfoLine line = IL_NONE;

                                switch (this->editable) {
                                        case EA_NONE: break;

                                        case EA_MULTIPLIER:
                                                if (IsInsideBS(pt.y, this->production_offset_y, FONT_HEIGHT_NORMAL)) line = IL_MULTIPLIER;
                                                break;

                                        case EA_RATE:
                                                if (pt.y >= this->production_offset_y) {
                                                        int row = (pt.y - this->production_offset_y) / FONT_HEIGHT_NORMAL;
                                                        for (uint j = 0; j < lengthof(i->produced_cargo); j++) {
                                                                if (i->produced_cargo[j] == CT_INVALID) continue;
                                                                row--;
                                                                if (row < 0) {
                                                                        line = (InfoLine)(IL_RATE1 + j);
                                                                        break;
                                                                }
                                                        }
                                                }
                                                break;
                                }
                                if (line == IL_NONE) return;

                                NWidgetBase *nwi = this->GetWidget<NWidgetBase>(widget);
                                int left = nwi->pos_x + WD_FRAMETEXT_LEFT;
                                int right = nwi->pos_x + nwi->current_x - 1 - WD_FRAMERECT_RIGHT;
                                if (IsInsideMM(pt.x, left, left + SETTING_BUTTON_WIDTH)) {
                                        /* Clicked buttons, decrease or increase production */
                                        byte button = (pt.x < left + SETTING_BUTTON_WIDTH / 2) ? 1 : 2;
                                        switch (this->editable) {
                                                case EA_MULTIPLIER:
                                                        if (button == 1) {
                                                                if (i->prod_level <= PRODLEVEL_MINIMUM) return;
                                                                i->prod_level = max<uint>(i->prod_level / 2, PRODLEVEL_MINIMUM);
                                                        } else {
                                                                if (i->prod_level >= PRODLEVEL_MAXIMUM) return;
                                                                i->prod_level = minu(i->prod_level * 2, PRODLEVEL_MAXIMUM);
                                                        }
                                                        break;

                                                case EA_RATE:
                                                        if (button == 1) {
                                                                if (i->production_rate[line - IL_RATE1] <= 0) return;
                                                                i->production_rate[line - IL_RATE1] = max(i->production_rate[line - IL_RATE1] / 2, 0);
                                                        } else {
                                                                if (i->production_rate[line - IL_RATE1] >= 255) return;
                                                                /* a zero production industry is unlikely to give anything but zero, so push it a little bit */
                                                                int new_prod = i->production_rate[line - IL_RATE1] == 0 ? 1 : i->production_rate[line - IL_RATE1] * 2;
                                                                i->production_rate[line - IL_RATE1] = minu(new_prod, 255);
                                                        }
                                                        break;

                                                default: NOT_REACHED();
                                        }

                                        UpdateIndustryProduction(i);
                                        this->SetDirty();
                                        this->SetTimeout();
                                        this->clicked_line = line;
                                        this->clicked_button = button;
                                } else if (IsInsideMM(pt.x, left + SETTING_BUTTON_WIDTH + 10, right)) {
                                        /* clicked the text */
                                        this->editbox_line = line;
                                        switch (this->editable) {
                                                case EA_MULTIPLIER:
                                                        SetDParam(0, RoundDivSU(i->prod_level * 100, PRODLEVEL_DEFAULT));
                                                        ShowQueryString(STR_JUST_INT, STR_CONFIG_GAME_PRODUCTION_LEVEL, 10, this, CS_ALPHANUMERAL, QSF_NONE);
                                                        break;

                                                case EA_RATE:
                                                        SetDParam(0, i->production_rate[line - IL_RATE1] * 8);
                                                        ShowQueryString(STR_JUST_INT, STR_CONFIG_GAME_PRODUCTION, 10, this, CS_ALPHANUMERAL, QSF_NONE);
                                                        break;

                                                default: NOT_REACHED();
                                        }
                                }
                                break;
                        }

                        case WID_IV_GOTO: {
                                Industry *i = Industry::Get(this->window_number);
                                if (_ctrl_pressed) {
                                        ShowExtraViewPortWindow(i->location.GetCenterTile());
                                } else {
                                        ScrollMainWindowToTile(i->location.GetCenterTile());
                                }
                                break;
                        }

                        case WID_IV_DISPLAY: {
                                Industry *i = Industry::Get(this->window_number);
                                ShowIndustryCargoesWindow(i->type);
                                break;
                        }
                }
        }

        virtual void OnTimeout()
        {
                this->clicked_line = IL_NONE;
                this->clicked_button = 0;
                this->SetDirty();
        }

        virtual void OnResize()
        {
                if (this->viewport != NULL) {
                        NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_IV_VIEWPORT);
                        nvp->UpdateViewportCoordinates(this);

                        ScrollWindowToTile(Industry::Get(this->window_number)->location.GetCenterTile(), this, true); // Re-center viewport.
                }
        }

        virtual void OnQueryTextFinished(char *str)
        {
                if (StrEmpty(str)) return;

                Industry *i = Industry::Get(this->window_number);
                uint value = atoi(str);
                switch (this->editbox_line) {
                        case IL_NONE: NOT_REACHED();

                        case IL_MULTIPLIER:
                                i->prod_level = ClampU(RoundDivSU(value * PRODLEVEL_DEFAULT, 100), PRODLEVEL_MINIMUM, PRODLEVEL_MAXIMUM);
                                break;

                        default:
                                i->production_rate[this->editbox_line - IL_RATE1] = ClampU(RoundDivSU(value, 8), 0, 255);
                                break;
                }
                UpdateIndustryProduction(i);
                this->SetDirty();
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
        {
                if (!gui_scope) return;
                const Industry *i = Industry::Get(this->window_number);
                if (IsProductionAlterable(i)) {
                        const IndustrySpec *ind = GetIndustrySpec(i->type);
                        this->editable = ind->UsesSmoothEconomy() ? EA_RATE : EA_MULTIPLIER;
                } else {
                        this->editable = EA_NONE;
                }
        }

        virtual bool IsNewGRFInspectable() const
        {
                return ::IsNewGRFInspectable(GSF_INDUSTRIES, this->window_number);
        }

        virtual void ShowNewGRFInspectWindow() const
        {
                ::ShowNewGRFInspectWindow(GSF_INDUSTRIES, this->window_number);
        }
};

static void UpdateIndustryProduction(Industry *i)
{
        const IndustrySpec *indspec = GetIndustrySpec(i->type);
        if (!indspec->UsesSmoothEconomy()) i->RecomputeProductionMultipliers();

        for (byte j = 0; j < lengthof(i->produced_cargo); j++) {
                if (i->produced_cargo[j] != CT_INVALID) {
                        i->last_month_production[j] = 8 * i->production_rate[j];
                }
        }
}

/** Widget definition of the view industry gui */
static const NWidgetPart _nested_industry_view_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_CREAM),
                NWidget(WWT_CAPTION, COLOUR_CREAM, WID_IV_CAPTION), SetDataTip(STR_INDUSTRY_VIEW_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_DEBUGBOX, COLOUR_CREAM),
                NWidget(WWT_SHADEBOX, COLOUR_CREAM),
                NWidget(WWT_DEFSIZEBOX, COLOUR_CREAM),
                NWidget(WWT_STICKYBOX, COLOUR_CREAM),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_CREAM),
                NWidget(WWT_INSET, COLOUR_CREAM), SetPadding(2, 2, 2, 2),
                        NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_IV_VIEWPORT), SetMinimalSize(254, 86), SetFill(1, 0), SetPadding(1, 1, 1, 1), SetResize(1, 1),
                EndContainer(),
        EndContainer(),
        NWidget(WWT_PANEL, COLOUR_CREAM, WID_IV_INFO), SetMinimalSize(260, 2), SetResize(1, 0),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_PUSHTXTBTN, COLOUR_CREAM, WID_IV_GOTO), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_BUTTON_LOCATION, STR_INDUSTRY_VIEW_LOCATION_TOOLTIP),
                NWidget(WWT_PUSHTXTBTN, COLOUR_CREAM, WID_IV_DISPLAY), SetFill(1, 0), SetResize(1, 0), SetDataTip(STR_INDUSTRY_DISPLAY_CHAIN, STR_INDUSTRY_DISPLAY_CHAIN_TOOLTIP),
                NWidget(WWT_RESIZEBOX, COLOUR_CREAM),
        EndContainer(),
};

/** Window preferences of the view industry gui */
static WindowDesc::Prefs _industry_view_prefs ("view_industry");

/** Window definition of the view industry gui */
static const WindowDesc _industry_view_desc(
        WDP_AUTO, 260, 120,
        WC_INDUSTRY_VIEW, WC_NONE,
        0,
        _nested_industry_view_widgets, lengthof(_nested_industry_view_widgets),
        &_industry_view_prefs
);

void ShowIndustryViewWindow(int industry)
{
        AllocateWindowDescFront<IndustryViewWindow>(&_industry_view_desc, industry);
}

/** Widget definition of the industry directory gui */
static const NWidgetPart _nested_industry_directory_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
                NWidget(WWT_CAPTION, COLOUR_BROWN), SetDataTip(STR_INDUSTRY_DIRECTORY_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                NWidget(WWT_SHADEBOX, COLOUR_BROWN),
                NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
                NWidget(WWT_STICKYBOX, COLOUR_BROWN),
        EndContainer(),
        NWidget(NWID_HORIZONTAL),
                NWidget(NWID_VERTICAL),
                        NWidget(NWID_HORIZONTAL),
                                NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_ID_DROPDOWN_ORDER), SetDataTip(STR_BUTTON_SORT_BY, STR_TOOLTIP_SORT_ORDER),
                                NWidget(WWT_DROPDOWN, COLOUR_BROWN, WID_ID_DROPDOWN_CRITERIA), SetDataTip(STR_JUST_STRING, STR_TOOLTIP_SORT_CRITERIA),
                                NWidget(WWT_PANEL, COLOUR_BROWN), SetResize(1, 0), EndContainer(),
                        EndContainer(),
                        NWidget(WWT_PANEL, COLOUR_BROWN, WID_ID_INDUSTRY_LIST), SetDataTip(0x0, STR_INDUSTRY_DIRECTORY_LIST_CAPTION), SetResize(1, 1), SetScrollbar(WID_ID_SCROLLBAR), EndContainer(),
                EndContainer(),
                NWidget(NWID_VERTICAL),
                        NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_ID_SCROLLBAR),
                        NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
                EndContainer(),
        EndContainer(),
};

typedef GUIList<const Industry*> GUIIndustryList;


/**
 * The list of industries.
 */
class IndustryDirectoryWindow : public Window {
protected:
        /* Runtime saved values */
        static Listing last_sorting;
        static const Industry *last_industry;

        /* Constants for sorting stations */
        static const StringID sorter_names[];
        static GUIIndustryList::SortFunction * const sorter_funcs[];

        GUIIndustryList industries;
        Scrollbar *vscroll;

        /** (Re)Build industries list */
        void BuildSortIndustriesList()
        {
                if (this->industries.NeedRebuild()) {
                        this->industries.Clear();

                        const Industry *i;
                        FOR_ALL_INDUSTRIES(i) {
                                *this->industries.Append() = i;
                        }

                        this->industries.Compact();
                        this->industries.RebuildDone();
                        this->vscroll->SetCount(this->industries.Length()); // Update scrollbar as well.
                }

                if (!this->industries.Sort()) return;
                IndustryDirectoryWindow::last_industry = NULL; // Reset name sorter sort cache
                this->SetWidgetDirty(WID_ID_INDUSTRY_LIST); // Set the modified widget dirty
        }

        /**
         * Returns percents of cargo transported if industry produces this cargo, else -1
         *
         * @param i industry to check
         * @param id cargo slot
         * @return percents of cargo transported, or -1 if industry doesn't use this cargo slot
         */
        static inline int GetCargoTransportedPercentsIfValid(const Industry *i, uint id)
        {
                assert(id < lengthof(i->produced_cargo));

                if (i->produced_cargo[id] == CT_INVALID) return 101;
                return ToPercent8(i->last_month_pct_transported[id]);
        }

        /**
         * Returns value representing industry's transported cargo
         *  percentage for industry sorting
         *
         * @param i industry to check
         * @return value used for sorting
         */
        static int GetCargoTransportedSortValue(const Industry *i)
        {
                int p1 = GetCargoTransportedPercentsIfValid(i, 0);
                int p2 = GetCargoTransportedPercentsIfValid(i, 1);

                if (p1 > p2) Swap(p1, p2); // lower value has higher priority

                return (p1 << 8) + p2;
        }

        /** Sort industries by name */
        static int CDECL IndustryNameSorter(const Industry * const *a, const Industry * const *b)
        {
                static char buf_cache[96];
                static char buf[96];

                SetDParam(0, (*a)->index);
                GetString (buf, STR_INDUSTRY_NAME);

                if (*b != last_industry) {
                        last_industry = *b;
                        SetDParam(0, (*b)->index);
                        GetString (buf_cache, STR_INDUSTRY_NAME);
                }

                return strnatcmp(buf, buf_cache); // Sort by name (natural sorting).
        }

        /** Sort industries by type and name */
        static int CDECL IndustryTypeSorter(const Industry * const *a, const Industry * const *b)
        {
                int it_a = 0;
                while (it_a != NUM_INDUSTRYTYPES && (*a)->type != _sorted_industry_types[it_a]) it_a++;
                int it_b = 0;
                while (it_b != NUM_INDUSTRYTYPES && (*b)->type != _sorted_industry_types[it_b]) it_b++;
                int r = it_a - it_b;
                return (r == 0) ? IndustryNameSorter(a, b) : r;
        }

        /** Sort industries by production and name */
        static int CDECL IndustryProductionSorter(const Industry * const *a, const Industry * const *b)
        {
                uint prod_a = 0, prod_b = 0;
                for (uint i = 0; i < lengthof((*a)->produced_cargo); i++) {
                        if ((*a)->produced_cargo[i] != CT_INVALID) prod_a += (*a)->last_month_production[i];
                        if ((*b)->produced_cargo[i] != CT_INVALID) prod_b += (*b)->last_month_production[i];
                }
                int r = prod_a - prod_b;

                return (r == 0) ? IndustryTypeSorter(a, b) : r;
        }

        /** Sort industries by transported cargo and name */
        static int CDECL IndustryTransportedCargoSorter(const Industry * const *a, const Industry * const *b)
        {
                int r = GetCargoTransportedSortValue(*a) - GetCargoTransportedSortValue(*b);
                return (r == 0) ? IndustryNameSorter(a, b) : r;
        }

        /**
         * Get the StringID to draw and set the appropriate DParams.
         * @param i the industry to get the StringID of.
         * @return the StringID.
         */
        StringID GetIndustryString(const Industry *i) const
        {
                const IndustrySpec *indsp = GetIndustrySpec(i->type);
                byte p = 0;

                /* Industry name */
                SetDParam(p++, i->index);

                static sstring<512> cargo_suffix [lengthof(i->produced_cargo)];

                /* Industry productions */
                for (byte j = 0; j < lengthof(i->produced_cargo); j++) {
                        if (i->produced_cargo[j] == CT_INVALID) continue;
                        GetCargoSuffix (j + 3, CST_DIR, i, i->type, indsp, &cargo_suffix[j]);
                        SetDParam(p++, i->produced_cargo[j]);
                        SetDParam(p++, i->last_month_production[j]);
                        SetDParamStr(p++, cargo_suffix[j].c_str());
                }

                /* Transported productions */
                for (byte j = 0; j < lengthof(i->produced_cargo); j++) {
                        if (i->produced_cargo[j] == CT_INVALID) continue;
                        SetDParam(p++, ToPercent8(i->last_month_pct_transported[j]));
                }

                /* Drawing the right string */
                switch (p) {
                        case 1:  return STR_INDUSTRY_DIRECTORY_ITEM_NOPROD;
                        case 5:  return STR_INDUSTRY_DIRECTORY_ITEM;
                        default: return STR_INDUSTRY_DIRECTORY_ITEM_TWO;
                }
        }

public:
        IndustryDirectoryWindow (const WindowDesc *desc, WindowNumber number)
                : Window (desc), industries(), vscroll (NULL)
        {
                this->CreateNestedTree();
                this->vscroll = this->GetScrollbar(WID_ID_SCROLLBAR);

                this->industries.SetListing(this->last_sorting);
                this->industries.SetSortFuncs(IndustryDirectoryWindow::sorter_funcs);
                this->industries.ForceRebuild();
                this->BuildSortIndustriesList();

                this->InitNested(0);
        }

        void OnDelete (void) FINAL_OVERRIDE
        {
                this->last_sorting = this->industries.GetListing();
        }

        virtual void SetStringParameters(int widget) const
        {
                if (widget == WID_ID_DROPDOWN_CRITERIA) SetDParam(0, IndustryDirectoryWindow::sorter_names[this->industries.SortType()]);
        }

        void DrawWidget (BlitArea *dpi, const Rect &r, int widget) const OVERRIDE
        {
                switch (widget) {
                        case WID_ID_DROPDOWN_ORDER:
                                this->DrawSortButtonState (dpi, widget, this->industries.IsDescSortOrder() ? SBS_DOWN : SBS_UP);
                                break;

                        case WID_ID_INDUSTRY_LIST: {
                                int n = 0;
                                int y = r.top + WD_FRAMERECT_TOP;
                                if (this->industries.Length() == 0) {
                                        DrawString (dpi, r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, STR_INDUSTRY_DIRECTORY_NONE);
                                        break;
                                }
                                for (uint i = this->vscroll->GetPosition(); i < this->industries.Length(); i++) {
                                        DrawString (dpi, r.left + WD_FRAMERECT_LEFT, r.right - WD_FRAMERECT_RIGHT, y, this->GetIndustryString(this->industries[i]));

                                        y += this->resize.step_height;
                                        if (++n == this->vscroll->GetCapacity()) break; // max number of industries in 1 window
                                }
                                break;
                        }
                }
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                switch (widget) {
                        case WID_ID_DROPDOWN_ORDER: {
                                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;
                        }

                        case WID_ID_DROPDOWN_CRITERIA: {
                                Dimension d = {0, 0};
                                for (uint i = 0; IndustryDirectoryWindow::sorter_names[i] != INVALID_STRING_ID; i++) {
                                        d = maxdim(d, GetStringBoundingBox(IndustryDirectoryWindow::sorter_names[i]));
                                }
                                d.width += padding.width;
                                d.height += padding.height;
                                *size = maxdim(*size, d);
                                break;
                        }

                        case WID_ID_INDUSTRY_LIST: {
                                Dimension d = GetStringBoundingBox(STR_INDUSTRY_DIRECTORY_NONE);
                                for (uint i = 0; i < this->industries.Length(); i++) {
                                        d = maxdim(d, GetStringBoundingBox(this->GetIndustryString(this->industries[i])));
                                }
                                resize->height = d.height;
                                d.height *= 5;
                                d.width += padding.width + WD_FRAMERECT_LEFT + WD_FRAMERECT_RIGHT;
                                d.height += padding.height + WD_FRAMERECT_TOP + WD_FRAMERECT_BOTTOM;
                                *size = maxdim(*size, d);
                                break;
                        }
                }
        }


        virtual void OnClick(Point pt, int widget, int click_count)
        {
                switch (widget) {
                        case WID_ID_DROPDOWN_ORDER:
                                this->industries.ToggleSortOrder();
                                this->SetDirty();
                                break;

                        case WID_ID_DROPDOWN_CRITERIA:
                                ShowDropDownMenu(this, IndustryDirectoryWindow::sorter_names, this->industries.SortType(), WID_ID_DROPDOWN_CRITERIA, 0, 0);
                                break;

                        case WID_ID_INDUSTRY_LIST: {
                                uint p = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_ID_INDUSTRY_LIST, WD_FRAMERECT_TOP);
                                if (p < this->industries.Length()) {
                                        if (_ctrl_pressed) {
                                                ShowExtraViewPortWindow(this->industries[p]->location.tile);
                                        } else {
                                                ScrollMainWindowToTile(this->industries[p]->location.tile);
                                        }
                                }
                                break;
                        }
                }
        }

        virtual void OnDropdownSelect(int widget, int index)
        {
                if (this->industries.SortType() != index) {
                        this->industries.SetSortType(index);
                        this->BuildSortIndustriesList();
                }
        }

        virtual void OnResize()
        {
                this->vscroll->SetCapacityFromWidget(this, WID_ID_INDUSTRY_LIST);
        }

        void OnPaint (BlitArea *dpi) OVERRIDE
        {
                if (this->industries.NeedRebuild()) this->BuildSortIndustriesList();
                this->DrawWidgets (dpi);
        }

        virtual void OnHundredthTick()
        {
                this->industries.ForceResort();
                this->BuildSortIndustriesList();
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
        {
                if (data == 0) {
                        /* This needs to be done in command-scope to enforce rebuilding before resorting invalid data */
                        this->industries.ForceRebuild();
                } else {
                        this->industries.ForceResort();
                }
        }
};

Listing IndustryDirectoryWindow::last_sorting = {false, 0};
const Industry *IndustryDirectoryWindow::last_industry = NULL;

/* Available station sorting functions. */
GUIIndustryList::SortFunction * const IndustryDirectoryWindow::sorter_funcs[] = {
        &IndustryNameSorter,
        &IndustryTypeSorter,
        &IndustryProductionSorter,
        &IndustryTransportedCargoSorter
};

/* Names of the sorting functions */
const StringID IndustryDirectoryWindow::sorter_names[] = {
        STR_SORT_BY_NAME,
        STR_SORT_BY_TYPE,
        STR_SORT_BY_PRODUCTION,
        STR_SORT_BY_TRANSPORTED,
        INVALID_STRING_ID
};


/** Window preferences of the industry directory gui */
static WindowDesc::Prefs _industry_directory_prefs ("list_industries");

/** Window definition of the industry directory gui */
static const WindowDesc _industry_directory_desc(
        WDP_AUTO, 428, 190,
        WC_INDUSTRY_DIRECTORY, WC_NONE,
        0,
        _nested_industry_directory_widgets, lengthof(_nested_industry_directory_widgets),
        &_industry_directory_prefs
);

void ShowIndustryDirectory()
{
        AllocateWindowDescFront<IndustryDirectoryWindow>(&_industry_directory_desc, 0);
}

/** Widgets of the industry cargoes window. */
static const NWidgetPart _nested_industry_cargoes_widgets[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
                NWidget(WWT_CAPTION, COLOUR_BROWN, WID_IC_CAPTION), SetDataTip(STR_INDUSTRY_CARGOES_INDUSTRY_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
                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_IC_PANEL), SetResize(1, 10), SetMinimalSize(200, 90), SetScrollbar(WID_IC_SCROLLBAR), EndContainer(),
                        NWidget(NWID_HORIZONTAL),
                                NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_IC_NOTIFY),
                                        SetDataTip(STR_INDUSTRY_CARGOES_NOTIFY_SMALLMAP, STR_INDUSTRY_CARGOES_NOTIFY_SMALLMAP_TOOLTIP),
                                NWidget(WWT_PANEL, COLOUR_BROWN), SetFill(1, 0), SetResize(0, 0), EndContainer(),
                                NWidget(WWT_DROPDOWN, COLOUR_BROWN, WID_IC_IND_DROPDOWN), SetFill(0, 0), SetResize(0, 0),
                                                SetDataTip(STR_INDUSTRY_CARGOES_SELECT_INDUSTRY, STR_INDUSTRY_CARGOES_SELECT_INDUSTRY_TOOLTIP),
                                NWidget(WWT_DROPDOWN, COLOUR_BROWN, WID_IC_CARGO_DROPDOWN), SetFill(0, 0), SetResize(0, 0),
                                                SetDataTip(STR_INDUSTRY_CARGOES_SELECT_CARGO, STR_INDUSTRY_CARGOES_SELECT_CARGO_TOOLTIP),
                        EndContainer(),
                EndContainer(),
                NWidget(NWID_VERTICAL),
                        NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_IC_SCROLLBAR),
                        NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
                EndContainer(),
        EndContainer(),
};

/** Window preferences for the industry cargoes window. */
static WindowDesc::Prefs _industry_cargoes_prefs ("industry_cargoes");

/** Window description for the industry cargoes window. */
static const WindowDesc _industry_cargoes_desc(
        WDP_AUTO, 300, 210,
        WC_INDUSTRY_CARGOES, WC_NONE,
        0,
        _nested_industry_cargoes_widgets, lengthof(_nested_industry_cargoes_widgets),
        &_industry_cargoes_prefs
);

/** Available types of field. */
enum CargoesFieldType {
        CFT_EMPTY,       ///< Empty field.
        CFT_SMALL_EMPTY, ///< Empty small field (for the header).
        CFT_INDUSTRY,    ///< Display industry.
        CFT_CARGO,       ///< Display cargo connections.
        CFT_CARGO_LABEL, ///< Display cargo labels.
        CFT_HEADER,      ///< Header text.
};

static const uint MAX_CARGOES = 3; ///< Maximum number of cargoes carried in a #CFT_CARGO field in #CargoesField.

/** Data about a single field in the #IndustryCargoesWindow panel. */
struct CargoesField {
        static const int VERT_INTER_INDUSTRY_SPACE;
        static const int HOR_CARGO_BORDER_SPACE;
        static const int CARGO_STUB_WIDTH;
        static const int HOR_CARGO_WIDTH, HOR_CARGO_SPACE;
        static const int CARGO_FIELD_WIDTH;
        static const int VERT_CARGO_SPACE, VERT_CARGO_EDGE;
        static const int BLOB_DISTANCE, BLOB_WIDTH, BLOB_HEIGHT;

        static const int INDUSTRY_LINE_COLOUR;
        static const int CARGO_LINE_COLOUR;

        static int small_height, normal_height;
        static int industry_width;

        CargoesFieldType type; ///< Type of field.
        union {
                struct {
                        IndustryType ind_type;                 ///< Industry type (#NUM_INDUSTRYTYPES means 'houses').
                        CargoID other_produced[MAX_CARGOES];   ///< Cargoes produced but not used in this figure.
                        CargoID other_accepted[MAX_CARGOES];   ///< Cargoes accepted but not used in this figure.
                } industry; ///< Industry data (for #CFT_INDUSTRY).
                struct {
                        CargoID vertical_cargoes[MAX_CARGOES]; ///< Cargoes running from top to bottom (cargo ID or #INVALID_CARGO).
                        byte num_cargoes;                      ///< Number of cargoes.
                        CargoID supp_cargoes[MAX_CARGOES];     ///< Cargoes entering from the left (index in #vertical_cargoes, or #INVALID_CARGO).
                        byte top_end;                          ///< Stop at the top of the vertical cargoes.
                        CargoID cust_cargoes[MAX_CARGOES];     ///< Cargoes leaving to the right (index in #vertical_cargoes, or #INVALID_CARGO).
                        byte bottom_end;                       ///< Stop at the bottom of the vertical cargoes.
                } cargo; ///< Cargo data (for #CFT_CARGO).
                struct {
                        CargoID cargoes[MAX_CARGOES];          ///< Cargoes to display (or #INVALID_CARGO).
                        bool left_align;                       ///< Align all cargo texts to the left (else align to the right).
                } cargo_label;   ///< Label data (for #CFT_CARGO_LABEL).
                StringID header; ///< Header text (for #CFT_HEADER).
        } u; // Data for each type.

        /**
         * Make one of the empty fields (#CFT_EMPTY or #CFT_SMALL_EMPTY).
         * @param type Type of empty field.
         */
        void MakeEmpty(CargoesFieldType type)
        {
                this->type = type;
        }

        /**
         * Make an industry type field.
         * @param ind_type Industry type (#NUM_INDUSTRYTYPES means 'houses').
         * @note #other_accepted and #other_produced should be filled later.
         */
        void MakeIndustry(IndustryType ind_type)
        {
                this->type = CFT_INDUSTRY;
                this->u.industry.ind_type = ind_type;
                MemSetT(this->u.industry.other_accepted, INVALID_CARGO, MAX_CARGOES);
                MemSetT(this->u.industry.other_produced, INVALID_CARGO, MAX_CARGOES);
        }

        /**
         * Connect a cargo from an industry to the #CFT_CARGO column.
         * @param cargo Cargo to connect.
         * @param produced Cargo is produced (if \c false, cargo is assumed to be accepted).
         * @return Horizontal connection index, or \c -1 if not accepted at all.
         */
        int ConnectCargo(CargoID cargo, bool producer)
        {
                assert(this->type == CFT_CARGO);
                if (cargo == INVALID_CARGO) return -1;

                /* Find the vertical cargo column carrying the cargo. */
                int column = -1;
                for (int i = 0; i < this->u.cargo.num_cargoes; i++) {
                        if (cargo == this->u.cargo.vertical_cargoes[i]) {
                                column = i;
                                break;
                        }
                }
                if (column < 0) return -1;

                if (producer) {
                        assert(this->u.cargo.supp_cargoes[column] == INVALID_CARGO);
                        this->u.cargo.supp_cargoes[column]  = column;
                } else {
                        assert(this->u.cargo.cust_cargoes[column] == INVALID_CARGO);
                        this->u.cargo.cust_cargoes[column] = column;
                }
                return column;
        }

        /**
         * Does this #CFT_CARGO field have a horizontal connection?
         * @return \c true if a horizontal connection exists, \c false otherwise.
         */
        bool HasConnection()
        {
                assert(this->type == CFT_CARGO);

                for (uint i = 0; i < MAX_CARGOES; i++) {
                        if (this->u.cargo.supp_cargoes[i] != INVALID_CARGO) return true;
                        if (this->u.cargo.cust_cargoes[i] != INVALID_CARGO) return true;
                }
                return false;
        }

        /**
         * Make a piece of cargo column.
         * @param cargoes    Array of #CargoID (may contain #INVALID_CARGO).
         * @param length     Number of cargoes in \a cargoes.
         * @param count      Number of cargoes to display (should be at least the number of valid cargoes, or \c -1 to let the method compute it).
         * @param top_end    This is the first cargo field of this column.
         * @param bottom_end This is the last cargo field of this column.
         * @note #supp_cargoes and #cust_cargoes should be filled in later.
         */
        void MakeCargo(const CargoID *cargoes, uint length, int count = -1, bool top_end = false, bool bottom_end = false)
        {
                this->type = CFT_CARGO;
                uint i;
                uint num = 0;
                for (i = 0; i < MAX_CARGOES && i < length; i++) {
                        if (cargoes[i] != INVALID_CARGO) {
                                this->u.cargo.vertical_cargoes[num] = cargoes[i];
                                num++;
                        }
                }
                this->u.cargo.num_cargoes = (count < 0) ? num : count;
                for (; num < MAX_CARGOES; num++) this->u.cargo.vertical_cargoes[num] = INVALID_CARGO;
                this->u.cargo.top_end = top_end;
                this->u.cargo.bottom_end = bottom_end;
                MemSetT(this->u.cargo.supp_cargoes, INVALID_CARGO, MAX_CARGOES);
                MemSetT(this->u.cargo.cust_cargoes, INVALID_CARGO, MAX_CARGOES);
        }

        /**
         * Make a field displaying cargo type names.
         * @param cargoes    Array of #CargoID (may contain #INVALID_CARGO).
         * @param length     Number of cargoes in \a cargoes.
         * @param left_align ALign texts to the left (else to the right).
         */
        void MakeCargoLabel(const CargoID *cargoes, uint length, bool left_align)
        {
                this->type = CFT_CARGO_LABEL;
                uint i;
                for (i = 0; i < MAX_CARGOES && i < length; i++) this->u.cargo_label.cargoes[i] = cargoes[i];
                for (; i < MAX_CARGOES; i++) this->u.cargo_label.cargoes[i] = INVALID_CARGO;
                this->u.cargo_label.left_align = left_align;
        }

        /**
         * Make a header above an industry column.
         * @param textid Text to display.
         */
        void MakeHeader(StringID textid)
        {
                this->type = CFT_HEADER;
                this->u.header = textid;
        }

        /**
         * For a #CFT_CARGO, compute the left position of the left-most vertical cargo connection.
         * @param xpos Left position of the field.
         * @return Left position of the left-most vertical cargo column.
         */
        int GetCargoBase(int xpos) const
        {
                assert(this->type == CFT_CARGO);

                switch (this->u.cargo.num_cargoes) {
                        case 0: return xpos + CARGO_FIELD_WIDTH / 2;
                        case 1: return xpos + CARGO_FIELD_WIDTH / 2 - HOR_CARGO_WIDTH / 2;
                        case 2: return xpos + CARGO_FIELD_WIDTH / 2 - HOR_CARGO_WIDTH - HOR_CARGO_SPACE / 2;
                        case 3: return xpos + CARGO_FIELD_WIDTH / 2 - HOR_CARGO_WIDTH - HOR_CARGO_SPACE - HOR_CARGO_WIDTH / 2;
                        default: NOT_REACHED();
                }
        }

        /**
         * Draw the field.
         * @param dpi  Area to draw on.
         * @param xpos Position of the left edge.
         * @param vpos Position of the top edge.
         */
        void Draw (BlitArea *dpi, int xpos, int ypos) const
        {
                switch (this->type) {
                        case CFT_EMPTY:
                        case CFT_SMALL_EMPTY:
                                break;

                        case CFT_HEADER:
                                ypos += (small_height - FONT_HEIGHT_NORMAL) / 2;
                                DrawString (dpi, xpos, xpos + industry_width, ypos, this->u.header, TC_WHITE, SA_HOR_CENTER);
                                break;

                        case CFT_INDUSTRY: {
                                int ypos1 = ypos + VERT_INTER_INDUSTRY_SPACE / 2;
                                int ypos2 = ypos + normal_height - 1 - VERT_INTER_INDUSTRY_SPACE / 2;
                                int xpos2 = xpos + industry_width - 1;
                                GfxDrawLine (dpi, xpos,  ypos1, xpos2, ypos1, INDUSTRY_LINE_COLOUR);
                                GfxDrawLine (dpi, xpos,  ypos1, xpos,  ypos2, INDUSTRY_LINE_COLOUR);
                                GfxDrawLine (dpi, xpos,  ypos2, xpos2, ypos2, INDUSTRY_LINE_COLOUR);
                                GfxDrawLine (dpi, xpos2, ypos1, xpos2, ypos2, INDUSTRY_LINE_COLOUR);
                                ypos += (normal_height - FONT_HEIGHT_NORMAL) / 2;
                                if (this->u.industry.ind_type < NUM_INDUSTRYTYPES) {
                                        const IndustrySpec *indsp = GetIndustrySpec(this->u.industry.ind_type);
                                        DrawString (dpi, xpos, xpos2, ypos, indsp->name, TC_WHITE, SA_HOR_CENTER);

                                        /* Draw the industry legend. */
                                        int blob_left, blob_right;
                                        if (_current_text_dir == TD_RTL) {
                                                blob_right = xpos2 - BLOB_DISTANCE;
                                                blob_left  = blob_right - BLOB_WIDTH;
                                        } else {
                                                blob_left  = xpos + BLOB_DISTANCE;
                                                blob_right = blob_left + BLOB_WIDTH;
                                        }
                                        GfxFillRect (dpi, blob_left,     ypos2 - BLOB_DISTANCE - BLOB_HEIGHT,     blob_right,     ypos2 - BLOB_DISTANCE,     PC_BLACK); // Border
                                        GfxFillRect (dpi, blob_left + 1, ypos2 - BLOB_DISTANCE - BLOB_HEIGHT + 1, blob_right - 1, ypos2 - BLOB_DISTANCE - 1, indsp->map_colour);
                                } else {
                                        DrawString (dpi, xpos, xpos2, ypos, STR_INDUSTRY_CARGOES_HOUSES, TC_FROMSTRING, SA_HOR_CENTER);
                                }

                                /* Draw the other_produced/other_accepted cargoes. */
                                const CargoID *other_right, *other_left;
                                if (_current_text_dir == TD_RTL) {
                                        other_right = this->u.industry.other_accepted;
                                        other_left  = this->u.industry.other_produced;
                                } else {
                                        other_right = this->u.industry.other_produced;
                                        other_left  = this->u.industry.other_accepted;
                                }
                                ypos1 += VERT_CARGO_EDGE;
                                for (uint i = 0; i < MAX_CARGOES; i++) {
                                        if (other_right[i] != INVALID_CARGO) {
                                                const CargoSpec *csp = CargoSpec::Get(other_right[i]);
                                                int xp = xpos + industry_width + CARGO_STUB_WIDTH;
                                                DrawHorConnection (dpi, xpos + industry_width, xp - 1, ypos1, csp);
                                                GfxDrawLine (dpi, xp, ypos1, xp, ypos1 + FONT_HEIGHT_NORMAL - 1, CARGO_LINE_COLOUR);
                                        }
                                        if (other_left[i] != INVALID_CARGO) {
                                                const CargoSpec *csp = CargoSpec::Get(other_left[i]);
                                                int xp = xpos - CARGO_STUB_WIDTH;
                                                DrawHorConnection (dpi, xp + 1, xpos - 1, ypos1, csp);
                                                GfxDrawLine (dpi, xp, ypos1, xp, ypos1 + FONT_HEIGHT_NORMAL - 1, CARGO_LINE_COLOUR);
                                        }
                                        ypos1 += FONT_HEIGHT_NORMAL + VERT_CARGO_SPACE;
                                }
                                break;
                        }

                        case CFT_CARGO: {
                                int cargo_base = this->GetCargoBase(xpos);
                                int top = ypos + (this->u.cargo.top_end ? VERT_INTER_INDUSTRY_SPACE / 2 + 1 : 0);
                                int bot = ypos - (this->u.cargo.bottom_end ? VERT_INTER_INDUSTRY_SPACE / 2 + 1 : 0) + normal_height - 1;
                                int colpos = cargo_base;
                                for (int i = 0; i < this->u.cargo.num_cargoes; i++) {
                                        if (this->u.cargo.top_end) GfxDrawLine (dpi, colpos, top - 1, colpos + HOR_CARGO_WIDTH - 1, top - 1, CARGO_LINE_COLOUR);
                                        if (this->u.cargo.bottom_end) GfxDrawLine (dpi, colpos, bot + 1, colpos + HOR_CARGO_WIDTH - 1, bot + 1, CARGO_LINE_COLOUR);
                                        GfxDrawLine (dpi, colpos, top, colpos, bot, CARGO_LINE_COLOUR);
                                        colpos++;
                                        const CargoSpec *csp = CargoSpec::Get(this->u.cargo.vertical_cargoes[i]);
                                        GfxFillRect (dpi, colpos, top, colpos + HOR_CARGO_WIDTH - 2, bot, csp->legend_colour, FILLRECT_OPAQUE);
                                        colpos += HOR_CARGO_WIDTH - 2;
                                        GfxDrawLine (dpi, colpos, top, colpos, bot, CARGO_LINE_COLOUR);
                                        colpos += 1 + HOR_CARGO_SPACE;
                                }

                                const CargoID *hor_left, *hor_right;
                                if (_current_text_dir == TD_RTL) {
                                        hor_left  = this->u.cargo.cust_cargoes;
                                        hor_right = this->u.cargo.supp_cargoes;
                                } else {
                                        hor_left  = this->u.cargo.supp_cargoes;
                                        hor_right = this->u.cargo.cust_cargoes;
                                }
                                ypos += VERT_CARGO_EDGE + VERT_INTER_INDUSTRY_SPACE / 2;
                                for (uint i = 0; i < MAX_CARGOES; i++) {
                                        if (hor_left[i] != INVALID_CARGO) {
                                                int col = hor_left[i];
                                                int dx = 0;
                                                const CargoSpec *csp = CargoSpec::Get(this->u.cargo.vertical_cargoes[col]);
                                                for (; col > 0; col--) {
                                                        int lf = cargo_base + col * HOR_CARGO_WIDTH + (col - 1) * HOR_CARGO_SPACE;
                                                        DrawHorConnection (dpi, lf, lf + HOR_CARGO_SPACE - dx, ypos, csp);
                                                        dx = 1;
                                                }
                                                DrawHorConnection (dpi, xpos, cargo_base - dx, ypos, csp);
                                        }
                                        if (hor_right[i] != INVALID_CARGO) {
                                                int col = hor_right[i];
                                                int dx = 0;
                                                const CargoSpec *csp = CargoSpec::Get(this->u.cargo.vertical_cargoes[col]);
                                                for (; col < this->u.cargo.num_cargoes - 1; col++) {
                                                        int lf = cargo_base + (col + 1) * HOR_CARGO_WIDTH + col * HOR_CARGO_SPACE;
                                                        DrawHorConnection (dpi, lf + dx - 1, lf + HOR_CARGO_SPACE - 1, ypos, csp);
                                                        dx = 1;
                                                }
                                                DrawHorConnection (dpi, cargo_base + col * HOR_CARGO_SPACE + (col + 1) * HOR_CARGO_WIDTH - 1 + dx, xpos + CARGO_FIELD_WIDTH - 1, ypos, csp);
                                        }
                                        ypos += FONT_HEIGHT_NORMAL + VERT_CARGO_SPACE;
                                }
                                break;
                        }

                        case CFT_CARGO_LABEL:
                                ypos += VERT_CARGO_EDGE + VERT_INTER_INDUSTRY_SPACE / 2;
                                for (uint i = 0; i < MAX_CARGOES; i++) {
                                        if (this->u.cargo_label.cargoes[i] != INVALID_CARGO) {
                                                const CargoSpec *csp = CargoSpec::Get(this->u.cargo_label.cargoes[i]);
                                                DrawString (dpi, xpos + WD_FRAMERECT_LEFT, xpos + industry_width - 1 - WD_FRAMERECT_RIGHT, ypos, csp->name, TC_WHITE,
                                                                (this->u.cargo_label.left_align) ? SA_LEFT : SA_RIGHT);
                                        }
                                        ypos += FONT_HEIGHT_NORMAL + VERT_CARGO_SPACE;
                                }
                                break;

                        default:
                                NOT_REACHED();
                }
        }

        /**
         * Decide which cargo was clicked at in a #CFT_CARGO field.
         * @param left  Left industry neighbour if available (else \c NULL should be supplied).
         * @param right Right industry neighbour if available (else \c NULL should be supplied).
         * @param pt    Click position in the cargo field.
         * @return Cargo clicked at, or #INVALID_CARGO if none.
         */
        CargoID CargoClickedAt(const CargoesField *left, const CargoesField *right, Point pt) const
        {
                assert(this->type == CFT_CARGO);

                /* Vertical matching. */
                int cpos = this->GetCargoBase(0);
                uint col;
                for (col = 0; col < this->u.cargo.num_cargoes; col++) {
                        if (pt.x < cpos) break;
                        if (pt.x < cpos + CargoesField::HOR_CARGO_WIDTH) return this->u.cargo.vertical_cargoes[col];
                        cpos += CargoesField::HOR_CARGO_WIDTH + CargoesField::HOR_CARGO_SPACE;
                }
                /* col = 0 -> left of first col, 1 -> left of 2nd col, ... this->u.cargo.num_cargoes right of last-col. */

                int vpos = VERT_INTER_INDUSTRY_SPACE / 2 + VERT_CARGO_EDGE;
                uint row;
                for (row = 0; row < MAX_CARGOES; row++) {
                        if (pt.y < vpos) return INVALID_CARGO;
                        if (pt.y < vpos + FONT_HEIGHT_NORMAL) break;
                        vpos += FONT_HEIGHT_NORMAL + VERT_CARGO_SPACE;
                }
                if (row == MAX_CARGOES) return INVALID_CARGO;

                /* row = 0 -> at first horizontal row, row = 1 -> second horizontal row, 2 = 3rd horizontal row. */
                if (col == 0) {
                        if (this->u.cargo.supp_cargoes[row] != INVALID_CARGO) return this->u.cargo.vertical_cargoes[this->u.cargo.supp_cargoes[row]];
                        if (left != NULL) {
                                if (left->type == CFT_INDUSTRY) return left->u.industry.other_produced[row];
                                if (left->type == CFT_CARGO_LABEL && !left->u.cargo_label.left_align) return left->u.cargo_label.cargoes[row];
                        }
                        return INVALID_CARGO;
                }
                if (col == this->u.cargo.num_cargoes) {
                        if (this->u.cargo.cust_cargoes[row] != INVALID_CARGO) return this->u.cargo.vertical_cargoes[this->u.cargo.cust_cargoes[row]];
                        if (right != NULL) {
                                if (right->type == CFT_INDUSTRY) return right->u.industry.other_accepted[row];
                                if (right->type == CFT_CARGO_LABEL && right->u.cargo_label.left_align) return right->u.cargo_label.cargoes[row];
                        }
                        return INVALID_CARGO;
                }
                if (row >= col) {
                        /* Clicked somewhere in-between vertical cargo connection.
                         * Since the horizontal connection is made in the same order as the vertical list, the above condition
                         * ensures we are left-below the main diagonal, thus at the supplying side.
                         */
                        return (this->u.cargo.supp_cargoes[row] != INVALID_CARGO) ? this->u.cargo.vertical_cargoes[this->u.cargo.supp_cargoes[row]] : INVALID_CARGO;
                } else {
                        /* Clicked at a customer connection. */
                        return (this->u.cargo.cust_cargoes[row] != INVALID_CARGO) ? this->u.cargo.vertical_cargoes[this->u.cargo.cust_cargoes[row]] : INVALID_CARGO;
                }
        }

        /**
         * Decide what cargo the user clicked in the cargo label field.
         * @param pt Click position in the cargo label field.
         * @return Cargo clicked at, or #INVALID_CARGO if none.
         */
        CargoID CargoLabelClickedAt(Point pt) const
        {
                assert(this->type == CFT_CARGO_LABEL);

                int vpos = VERT_INTER_INDUSTRY_SPACE / 2 + VERT_CARGO_EDGE;
                uint row;
                for (row = 0; row < MAX_CARGOES; row++) {
                        if (pt.y < vpos) return INVALID_CARGO;
                        if (pt.y < vpos + FONT_HEIGHT_NORMAL) break;
                        vpos += FONT_HEIGHT_NORMAL + VERT_CARGO_SPACE;
                }
                if (row == MAX_CARGOES) return INVALID_CARGO;
                return this->u.cargo_label.cargoes[row];
        }

private:
        /**
         * Draw a horizontal cargo connection.
         * @param dpi   Area to draw on.
         * @param left  Left-most coordinate to draw.
         * @param right Right-most coordinate to draw.
         * @param top   Top coordinate of the cargo connection.
         * @param csp   Cargo to draw.
         */
        static void DrawHorConnection (BlitArea *dpi,
                int left, int right, int top, const CargoSpec *csp)
        {
                GfxDrawLine (dpi, left, top, right, top, CARGO_LINE_COLOUR);
                GfxFillRect (dpi, left, top + 1, right, top + FONT_HEIGHT_NORMAL - 2, csp->legend_colour, FILLRECT_OPAQUE);
                GfxDrawLine (dpi, left, top + FONT_HEIGHT_NORMAL - 1, right, top + FONT_HEIGHT_NORMAL - 1, CARGO_LINE_COLOUR);
        }
};

assert_compile(MAX_CARGOES >= cpp_lengthof(IndustrySpec, produced_cargo));
assert_compile(MAX_CARGOES >= cpp_lengthof(IndustrySpec, accepts_cargo));

int CargoesField::small_height;   ///< Height of the header row.
int CargoesField::normal_height;  ///< Height of the non-header rows.
int CargoesField::industry_width; ///< Width of an industry field.
const int CargoesField::VERT_INTER_INDUSTRY_SPACE = 6; ///< Amount of space between two industries in a column.

const int CargoesField::HOR_CARGO_BORDER_SPACE = 15; ///< Amount of space between the left/right edge of a #CFT_CARGO field, and the left/right most vertical cargo.
const int CargoesField::CARGO_STUB_WIDTH       = 10; ///< Width of a cargo not carried in the column (should be less than #HOR_CARGO_BORDER_SPACE).
const int CargoesField::HOR_CARGO_WIDTH        = 15; ///< Width of a vertical cargo column (inclusive the border line).
const int CargoesField::HOR_CARGO_SPACE        =  5; ///< Amount of horizontal space between two vertical cargoes.
const int CargoesField::VERT_CARGO_EDGE        =  4; ///< Amount of vertical space between top/bottom and the top/bottom connected cargo at an industry.
const int CargoesField::VERT_CARGO_SPACE       =  4; ///< Amount of vertical space between two connected cargoes at an industry.

const int CargoesField::BLOB_DISTANCE =  5; ///< Distance of the industry legend colour from the edge of the industry box.
const int CargoesField::BLOB_WIDTH    = 12; ///< Width of the industry legend colour, including border.
const int CargoesField::BLOB_HEIGHT   =  9; ///< Height of the industry legend colour, including border

/** Width of a #CFT_CARGO field. */
const int CargoesField::CARGO_FIELD_WIDTH = HOR_CARGO_BORDER_SPACE * 2 + HOR_CARGO_WIDTH * MAX_CARGOES + HOR_CARGO_SPACE * (MAX_CARGOES - 1);

const int CargoesField::INDUSTRY_LINE_COLOUR = PC_YELLOW; ///< Line colour of the industry type box.
const int CargoesField::CARGO_LINE_COLOUR    = PC_YELLOW; ///< Line colour around the cargo.

/** A single row of #CargoesField. */
struct CargoesRow {
        CargoesField columns[5]; ///< One row of fields.

        /**
         * Connect industry production cargoes to the cargo column after it.
         * @param column Column of the industry.
         */
        void ConnectIndustryProduced(int column)
        {
                CargoesField *ind_fld   = this->columns + column;
                CargoesField *cargo_fld = this->columns + column + 1;
                assert(ind_fld->type == CFT_INDUSTRY && cargo_fld->type == CFT_CARGO);

                MemSetT(ind_fld->u.industry.other_produced, INVALID_CARGO, MAX_CARGOES);

                if (ind_fld->u.industry.ind_type < NUM_INDUSTRYTYPES) {
                        CargoID others[MAX_CARGOES]; // Produced cargoes not carried in the cargo column.
                        int other_count = 0;

                        const IndustrySpec *indsp = GetIndustrySpec(ind_fld->u.industry.ind_type);
                        for (uint i = 0; i < lengthof(indsp->produced_cargo); i++) {
                                int col = cargo_fld->ConnectCargo(indsp->produced_cargo[i], true);
                                if (col < 0) others[other_count++] = indsp->produced_cargo[i];
                        }

                        /* Allocate other cargoes in the empty holes of the horizontal cargo connections. */
                        for (uint i = 0; i < MAX_CARGOES && other_count > 0; i++) {
                                if (cargo_fld->u.cargo.supp_cargoes[i] == INVALID_CARGO) ind_fld->u.industry.other_produced[i] = others[--other_count];
                        }
                } else {
                        /* Houses only display what is demanded. */
                        for (uint i = 0; i < cargo_fld->u.cargo.num_cargoes; i++) {
                                CargoID cid = cargo_fld->u.cargo.vertical_cargoes[i];
                                if (cid == CT_PASSENGERS || cid == CT_MAIL) cargo_fld->ConnectCargo(cid, true);
                        }
                }
        }

        /**
         * Construct a #CFT_CARGO_LABEL field.
         * @param column    Column to create the new field.
         * @param accepting Display accepted cargo (if \c false, display produced cargo).
         */
        void MakeCargoLabel(int column, bool accepting)
        {
                CargoID cargoes[MAX_CARGOES];
                MemSetT(cargoes, INVALID_CARGO, lengthof(cargoes));

                CargoesField *label_fld = this->columns + column;
                CargoesField *cargo_fld = this->columns + (accepting ? column - 1 : column + 1);

                assert(cargo_fld->type == CFT_CARGO && label_fld->type == CFT_EMPTY);
                for (uint i = 0; i < cargo_fld->u.cargo.num_cargoes; i++) {
                        int col = cargo_fld->ConnectCargo(cargo_fld->u.cargo.vertical_cargoes[i], !accepting);
                        if (col >= 0) cargoes[col] = cargo_fld->u.cargo.vertical_cargoes[i];
                }
                label_fld->MakeCargoLabel(cargoes, lengthof(cargoes), accepting);
        }


        /**
         * Connect industry accepted cargoes to the cargo column before it.
         * @param column Column of the industry.
         */
        void ConnectIndustryAccepted(int column)
        {
                CargoesField *ind_fld   = this->columns + column;
                CargoesField *cargo_fld = this->columns + column - 1;
                assert(ind_fld->type == CFT_INDUSTRY && cargo_fld->type == CFT_CARGO);

                MemSetT(ind_fld->u.industry.other_accepted, INVALID_CARGO, MAX_CARGOES);

                if (ind_fld->u.industry.ind_type < NUM_INDUSTRYTYPES) {
                        CargoID others[MAX_CARGOES]; // Accepted cargoes not carried in the cargo column.
                        int other_count = 0;

                        const IndustrySpec *indsp = GetIndustrySpec(ind_fld->u.industry.ind_type);
                        for (uint i = 0; i < lengthof(indsp->accepts_cargo); i++) {
                                int col = cargo_fld->ConnectCargo(indsp->accepts_cargo[i], false);
                                if (col < 0) others[other_count++] = indsp->accepts_cargo[i];
                        }

                        /* Allocate other cargoes in the empty holes of the horizontal cargo connections. */
                        for (uint i = 0; i < MAX_CARGOES && other_count > 0; i++) {
                                if (cargo_fld->u.cargo.cust_cargoes[i] == INVALID_CARGO) ind_fld->u.industry.other_accepted[i] = others[--other_count];
                        }
                } else {
                        /* Houses only display what is demanded. */
                        for (uint i = 0; i < cargo_fld->u.cargo.num_cargoes; i++) {
                                for (uint h = 0; h < NUM_HOUSES; h++) {
                                        HouseSpec *hs = HouseSpec::Get(h);
                                        if (!hs->enabled) continue;

                                        for (uint j = 0; j < lengthof(hs->accepts_cargo); j++) {
                                                if (hs->cargo_acceptance[j] > 0 && cargo_fld->u.cargo.vertical_cargoes[i] == hs->accepts_cargo[j]) {
                                                        cargo_fld->ConnectCargo(cargo_fld->u.cargo.vertical_cargoes[i], false);
                                                        goto next_cargo;
                                                }
                                        }
                                }
next_cargo: ;
                        }
                }
        }
};


/**
 * Window displaying the cargo connections around an industry (or cargo).
 *
 * The main display is constructed from 'fields', rectangles that contain an industry, piece of the cargo connection, cargo labels, or headers.
 * For a nice display, the following should be kept in mind:
 * - A #CFT_HEADER is always at the top of an column of #CFT_INDUSTRY fields.
 * - A #CFT_CARGO_LABEL field is also always put in a column of #CFT_INDUSTRY fields.
 * - The top row contains #CFT_HEADER and #CFT_SMALL_EMPTY fields.
 * - Cargo connections have a column of their own (#CFT_CARGO fields).
 * - Cargo accepted or produced by an industry, but not carried in a cargo connection, is drawn in the space of a cargo column attached to the industry.
 *   The information however is part of the industry.
 *
 * This results in the following invariants:
 * - Width of a #CFT_INDUSTRY column is large enough to hold all industry type labels, all cargo labels, and all header texts.
 * - Height of a #CFT_INDUSTRY is large enough to hold a header line, or a industry type line, \c N cargo labels
 *   (where \c N is the maximum number of cargoes connected between industries), \c N connections of cargo types, and space
 *   between two industry types (1/2 above it, and 1/2 underneath it).
 * - Width of a cargo field (#CFT_CARGO) is large enough to hold \c N vertical columns (one for each type of cargo).
 *   Also, space is needed between an industry and the leftmost/rightmost column to draw the non-carried cargoes.
 * - Height of a #CFT_CARGO field is equally high as the height of the #CFT_INDUSTRY.
 * - A field at the top (#CFT_HEADER or #CFT_SMALL_EMPTY) match the width of the fields below them (#CFT_INDUSTRY respectively
 *   #CFT_CARGO), the height should be sufficient to display the header text.
 *
 * When displaying the cargoes around an industry type, five columns are needed (supplying industries, accepted cargoes, the industry,
 * produced cargoes, customer industries). Displaying the industries around a cargo needs three columns (supplying industries, the cargo,
 * customer industries). The remaining two columns are set to #CFT_EMPTY with a width equal to the average of a cargo and an industry column.
 */
struct IndustryCargoesWindow : public Window {
        static const int HOR_TEXT_PADDING, VERT_TEXT_PADDING;

        typedef SmallVector<CargoesRow, 4> Fields;

        Fields fields;  ///< Fields to display in the #WID_IC_PANEL.
        uint ind_cargo; ///< If less than #NUM_INDUSTRYTYPES, an industry type, else a cargo id + NUM_INDUSTRYTYPES.
        Dimension cargo_textsize; ///< Size to hold any cargo text, as well as STR_INDUSTRY_CARGOES_SELECT_CARGO.
        Dimension ind_textsize;   ///< Size to hold any industry type text, as well as STR_INDUSTRY_CARGOES_SELECT_INDUSTRY.
        Scrollbar *vscroll;

        IndustryCargoesWindow (int id) : Window (&_industry_cargoes_desc),
                fields(), ind_cargo (0), vscroll (NULL), type (CFT_EMPTY)
        {
                this->cargo_textsize.width  = 0;
                this->cargo_textsize.height = 0;
                this->ind_textsize.width  = 0;
                this->ind_textsize.height = 0;

                this->OnInit();
                this->CreateNestedTree();
                this->vscroll = this->GetScrollbar(WID_IC_SCROLLBAR);
                this->InitNested(0);
                this->OnInvalidateData(id);
        }

        virtual void OnInit()
        {
                /* Initialize static CargoesField size variables. */
                Dimension d = GetStringBoundingBox(STR_INDUSTRY_CARGOES_PRODUCERS);
                d = maxdim(d, GetStringBoundingBox(STR_INDUSTRY_CARGOES_CUSTOMERS));
                d.width  += WD_FRAMETEXT_LEFT + WD_FRAMETEXT_RIGHT;
                d.height += WD_FRAMETEXT_TOP + WD_FRAMETEXT_BOTTOM;
                CargoesField::small_height = d.height;

                /* Decide about the size of the box holding the text of an industry type. */
                this->ind_textsize.width = 0;
                this->ind_textsize.height = 0;
                for (IndustryType it = 0; it < NUM_INDUSTRYTYPES; it++) {
                        const IndustrySpec *indsp = GetIndustrySpec(it);
                        if (!indsp->enabled) continue;
                        this->ind_textsize = maxdim(this->ind_textsize, GetStringBoundingBox(indsp->name));
                }
                d.width = max(d.width, this->ind_textsize.width);
                d.height = this->ind_textsize.height;
                this->ind_textsize = maxdim(this->ind_textsize, GetStringBoundingBox(STR_INDUSTRY_CARGOES_SELECT_INDUSTRY));

                /* Compute max size of the cargo texts. */
                this->cargo_textsize.width = 0;
                this->cargo_textsize.height = 0;
                for (uint i = 0; i < NUM_CARGO; i++) {
                        const CargoSpec *csp = CargoSpec::Get(i);
                        if (!csp->IsValid()) continue;
                        this->cargo_textsize = maxdim(this->cargo_textsize, GetStringBoundingBox(csp->name));
                }
                d = maxdim(d, this->cargo_textsize); // Box must also be wide enough to hold any cargo label.
                this->cargo_textsize = maxdim(this->cargo_textsize, GetStringBoundingBox(STR_INDUSTRY_CARGOES_SELECT_CARGO));

                d.width  += 2 * HOR_TEXT_PADDING;
                /* Ensure the height is enough for the industry type text, for the horizontal connections, and for the cargo labels. */
                uint min_ind_height = CargoesField::VERT_CARGO_EDGE * 2 + MAX_CARGOES * FONT_HEIGHT_NORMAL + (MAX_CARGOES - 1) *  CargoesField::VERT_CARGO_SPACE;
                d.height = max(d.height + 2 * VERT_TEXT_PADDING, min_ind_height);

                CargoesField::industry_width = d.width;
                CargoesField::normal_height = d.height + CargoesField::VERT_INTER_INDUSTRY_SPACE;
        }

        virtual void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize)
        {
                switch (widget) {
                        case WID_IC_PANEL:
                                size->width = WD_FRAMETEXT_LEFT + CargoesField::industry_width * 3 + CargoesField::CARGO_FIELD_WIDTH * 2 + WD_FRAMETEXT_RIGHT;
                                break;

                        case WID_IC_IND_DROPDOWN:
                                size->width = max(size->width, this->ind_textsize.width + padding.width);
                                break;

                        case WID_IC_CARGO_DROPDOWN:
                                size->width = max(size->width, this->cargo_textsize.width + padding.width);
                                break;
                }
        }


        CargoesFieldType type; ///< Type of field.
        virtual void SetStringParameters  (int widget) const
        {
                if (widget != WID_IC_CAPTION) return;

                if (this->ind_cargo < NUM_INDUSTRYTYPES) {
                        const IndustrySpec *indsp = GetIndustrySpec(this->ind_cargo);
                        SetDParam(0, indsp->name);
                } else {
                        const CargoSpec *csp = CargoSpec::Get(this->ind_cargo - NUM_INDUSTRYTYPES);
                        SetDParam(0, csp->name);
                }
        }

        /**
         * Do the two sets of cargoes have a valid cargo in common?
         * @param cargoes1 Base address of the first cargo array.
         * @param length1  Number of cargoes in the first cargo array.
         * @param cargoes2 Base address of the second cargo array.
         * @param length2  Number of cargoes in the second cargo array.
         * @return Arrays have at least one valid cargo in common.
         */
        static bool HasCommonValidCargo(const CargoID *cargoes1, uint length1, const CargoID *cargoes2, uint length2)
        {
                while (length1 > 0) {
                        if (*cargoes1 != INVALID_CARGO) {
                                for (uint i = 0; i < length2; i++) if (*cargoes1 == cargoes2[i]) return true;
                        }
                        cargoes1++;
                        length1--;
                }
                return false;
        }

        /**
         * Can houses be used to supply one of the cargoes?
         * @param cargoes Base address of the cargo array.
         * @param length  Number of cargoes in the array.
         * @return Houses can supply at least one of the cargoes.
         */
        static bool HousesCanSupply(const CargoID *cargoes, uint length)
        {
                for (uint i = 0; i < length; i++) {
                        if (cargoes[i] == INVALID_CARGO) continue;
                        if (cargoes[i] == CT_PASSENGERS || cargoes[i] == CT_MAIL) return true;
                }
                return false;
        }

        /**
         * Can houses be used as customers of the produced cargoes?
         * @param cargoes Base address of the cargo array.
         * @param length  Number of cargoes in the array.
         * @return Houses can accept at least one of the cargoes.
         */
        static bool HousesCanAccept(const CargoID *cargoes, uint length)
        {
                HouseZones climate_mask;
                switch (_settings_game.game_creation.landscape) {
                        case LT_TEMPERATE: climate_mask = HZ_TEMP; break;
                        case LT_ARCTIC:    climate_mask = HZ_SUBARTC_ABOVE | HZ_SUBARTC_BELOW; break;
                        case LT_TROPIC:    climate_mask = HZ_SUBTROPIC; break;
                        case LT_TOYLAND:   climate_mask = HZ_TOYLND; break;
                        default: NOT_REACHED();
                }
                for (uint i = 0; i < length; i++) {
                        if (cargoes[i] == INVALID_CARGO) continue;

                        for (uint h = 0; h < NUM_HOUSES; h++) {
                                HouseSpec *hs = HouseSpec::Get(h);
                                if (!hs->enabled || !(hs->building_availability & climate_mask)) continue;

                                for (uint j = 0; j < lengthof(hs->accepts_cargo); j++) {
                                        if (hs->cargo_acceptance[j] > 0 && cargoes[i] == hs->accepts_cargo[j]) return true;
                                }
                        }
                }
                return false;
        }

        /**
         * Count how many industries have accepted cargoes in common with one of the supplied set.
         * @param cargoes Cargoes to search.
         * @param length  Number of cargoes in \a cargoes.
         * @return Number of industries that have an accepted cargo in common with the supplied set.
         */
        static int CountMatchingAcceptingIndustries(const CargoID *cargoes, uint length)
        {
                int count = 0;
                for (IndustryType it = 0; it < NUM_INDUSTRYTYPES; it++) {
                        const IndustrySpec *indsp = GetIndustrySpec(it);
                        if (!indsp->enabled) continue;

                        if (HasCommonValidCargo(cargoes, length, indsp->accepts_cargo, lengthof(indsp->accepts_cargo))) count++;
                }
                return count;
        }

        /**
         * Count how many industries have produced cargoes in common with one of the supplied set.
         * @param cargoes Cargoes to search.
         * @param length  Number of cargoes in \a cargoes.
         * @return Number of industries that have a produced cargo in common with the supplied set.
         */
        static int CountMatchingProducingIndustries(const CargoID *cargoes, uint length)
        {
                int count = 0;
                for (IndustryType it = 0; it < NUM_INDUSTRYTYPES; it++) {
                        const IndustrySpec *indsp = GetIndustrySpec(it);
                        if (!indsp->enabled) continue;

                        if (HasCommonValidCargo(cargoes, length, indsp->produced_cargo, lengthof(indsp->produced_cargo))) count++;
                }
                return count;
        }

        /**
         * Shorten the cargo column to just the part between industries.
         * @param column Column number of the cargo column.
         * @param top    Current top row.
         * @param bottom Current bottom row.
         */
        void ShortenCargoColumn(int column, int top, int bottom)
        {
                while (top < bottom && !this->fields[top].columns[column].HasConnection()) {
                        this->fields[top].columns[column].MakeEmpty(CFT_EMPTY);
                        top++;
                }
                this->fields[top].columns[column].u.cargo.top_end = true;

                while (bottom > top && !this->fields[bottom].columns[column].HasConnection()) {
                        this->fields[bottom].columns[column].MakeEmpty(CFT_EMPTY);
                        bottom--;
                }
                this->fields[bottom].columns[column].u.cargo.bottom_end = true;
        }

        /**
         * Place an industry in the fields.
         * @param row Row of the new industry.
         * @param col Column of the new industry.
         * @param it  Industry to place.
         */
        void PlaceIndustry(int row, int col, IndustryType it)
        {
                assert(this->fields[row].columns[col].type == CFT_EMPTY);
                this->fields[row].columns[col].MakeIndustry(it);
                if (col == 0) {
                        this->fields[row].ConnectIndustryProduced(col);
                } else {
                        this->fields[row].ConnectIndustryAccepted(col);
                }
        }

        /**
         * Notify smallmap that new displayed industries have been selected (in #_displayed_industries).
         */
        void NotifySmallmap()
        {
                if (!this->IsWidgetLowered(WID_IC_NOTIFY)) return;

                /* Only notify the smallmap window if it exists. In particular, do not
                 * bring it to the front to prevent messing up any nice layout of the user. */
                InvalidateWindowClassesData(WC_SMALLMAP, 0);
        }

        /**
         * Compute what and where to display for industry type \a it.
         * @param it Industry type to display.
         */
        void ComputeIndustryDisplay(IndustryType it)
        {
                this->GetWidget<NWidgetCore>(WID_IC_CAPTION)->widget_data = STR_INDUSTRY_CARGOES_INDUSTRY_CAPTION;
                this->ind_cargo = it;
                _displayed_industries.reset();
                _displayed_industries.set(it);

                this->fields.Clear();
                CargoesRow *row = this->fields.Append();
                row->columns[0].MakeHeader(STR_INDUSTRY_CARGOES_PRODUCERS);
                row->columns[1].MakeEmpty(CFT_SMALL_EMPTY);
                row->columns[2].MakeEmpty(CFT_SMALL_EMPTY);
                row->columns[3].MakeEmpty(CFT_SMALL_EMPTY);
                row->columns[4].MakeHeader(STR_INDUSTRY_CARGOES_CUSTOMERS);

                const IndustrySpec *central_sp = GetIndustrySpec(it);
                bool houses_supply = HousesCanSupply(central_sp->accepts_cargo, lengthof(central_sp->accepts_cargo));
                bool houses_accept = HousesCanAccept(central_sp->produced_cargo, lengthof(central_sp->produced_cargo));
                /* Make a field consisting of two cargo columns. */
                int num_supp = CountMatchingProducingIndustries(central_sp->accepts_cargo, lengthof(central_sp->accepts_cargo)) + houses_supply;
                int num_cust = CountMatchingAcceptingIndustries(central_sp->produced_cargo, lengthof(central_sp->produced_cargo)) + houses_accept;
                int num_indrows = max(3, max(num_supp, num_cust)); // One is needed for the 'it' industry, and 2 for the cargo labels.
                for (int i = 0; i < num_indrows; i++) {
                        CargoesRow *row = this->fields.Append();
                        row->columns[0].MakeEmpty(CFT_EMPTY);
                        row->columns[1].MakeCargo(central_sp->accepts_cargo, lengthof(central_sp->accepts_cargo));
                        row->columns[2].MakeEmpty(CFT_EMPTY);
                        row->columns[3].MakeCargo(central_sp->produced_cargo, lengthof(central_sp->produced_cargo));
                        row->columns[4].MakeEmpty(CFT_EMPTY);
                }
                /* Add central industry. */
                int central_row = 1 + num_indrows / 2;
                this->fields[central_row].columns[2].MakeIndustry(it);
                this->fields[central_row].ConnectIndustryProduced(2);
                this->fields[central_row].ConnectIndustryAccepted(2);

                /* Add cargo labels. */
                this->fields[central_row - 1].MakeCargoLabel(2, true);
                this->fields[central_row + 1].MakeCargoLabel(2, false);

                /* Add suppliers and customers of the 'it' industry. */
                int supp_count = 0;
                int cust_count = 0;
                for (IndustryType it = 0; it < NUM_INDUSTRYTYPES; it++) {
                        const IndustrySpec *indsp = GetIndustrySpec(it);
                        if (!indsp->enabled) continue;

                        if (HasCommonValidCargo(central_sp->accepts_cargo, lengthof(central_sp->accepts_cargo), indsp->produced_cargo, lengthof(indsp->produced_cargo))) {
                                this->PlaceIndustry(1 + supp_count * num_indrows / num_supp, 0, it);
                                _displayed_industries.set(it);
                                supp_count++;
                        }
                        if (HasCommonValidCargo(central_sp->produced_cargo, lengthof(central_sp->produced_cargo), indsp->accepts_cargo, lengthof(indsp->accepts_cargo))) {
                                this->PlaceIndustry(1 + cust_count * num_indrows / num_cust, 4, it);
                                _displayed_industries.set(it);
                                cust_count++;
                        }
                }
                if (houses_supply) {
                        this->PlaceIndustry(1 + supp_count * num_indrows / num_supp, 0, NUM_INDUSTRYTYPES);
                        supp_count++;
                }
                if (houses_accept) {
                        this->PlaceIndustry(1 + cust_count * num_indrows / num_cust, 4, NUM_INDUSTRYTYPES);
                        cust_count++;
                }

                this->ShortenCargoColumn(1, 1, num_indrows);
                this->ShortenCargoColumn(3, 1, num_indrows);
                const NWidgetBase *nwp = this->GetWidget<NWidgetBase>(WID_IC_PANEL);
                this->vscroll->SetCount(CeilDiv(WD_FRAMETEXT_TOP + WD_FRAMETEXT_BOTTOM + CargoesField::small_height + num_indrows * CargoesField::normal_height, nwp->resize_y));
                this->SetDirty();
                this->NotifySmallmap();
        }

        /**
         * Compute what and where to display for cargo id \a cid.
         * @param cid Cargo id to display.
         */
        void ComputeCargoDisplay(CargoID cid)
        {
                this->GetWidget<NWidgetCore>(WID_IC_CAPTION)->widget_data = STR_INDUSTRY_CARGOES_CARGO_CAPTION;
                this->ind_cargo = cid + NUM_INDUSTRYTYPES;
                _displayed_industries.reset();

                this->fields.Clear();
                CargoesRow *row = this->fields.Append();
                row->columns[0].MakeHeader(STR_INDUSTRY_CARGOES_PRODUCERS);
                row->columns[1].MakeEmpty(CFT_SMALL_EMPTY);
                row->columns[2].MakeHeader(STR_INDUSTRY_CARGOES_CUSTOMERS);
                row->columns[3].MakeEmpty(CFT_SMALL_EMPTY);
                row->columns[4].MakeEmpty(CFT_SMALL_EMPTY);

                bool houses_supply = HousesCanSupply(&cid, 1);
                bool houses_accept = HousesCanAccept(&cid, 1);
                int num_supp = CountMatchingProducingIndustries(&cid, 1) + houses_supply + 1; // Ensure room for the cargo label.
                int num_cust = CountMatchingAcceptingIndustries(&cid, 1) + houses_accept;
                int num_indrows = max(num_supp, num_cust);
                for (int i = 0; i < num_indrows; i++) {
                        CargoesRow *row = this->fields.Append();
                        row->columns[0].MakeEmpty(CFT_EMPTY);
                        row->columns[1].MakeCargo(&cid, 1);
                        row->columns[2].MakeEmpty(CFT_EMPTY);
                        row->columns[3].MakeEmpty(CFT_EMPTY);
                        row->columns[4].MakeEmpty(CFT_EMPTY);
                }

                this->fields[num_indrows].MakeCargoLabel(0, false); // Add cargo labels at the left bottom.

                /* Add suppliers and customers of the cargo. */
                int supp_count = 0;
                int cust_count = 0;
                for (IndustryType it = 0; it < NUM_INDUSTRYTYPES; it++) {
                        const IndustrySpec *indsp = GetIndustrySpec(it);
                        if (!indsp->enabled) continue;

                        if (HasCommonValidCargo(&cid, 1, indsp->produced_cargo, lengthof(indsp->produced_cargo))) {
                                this->PlaceIndustry(1 + supp_count * num_indrows / num_supp, 0, it);
                                _displayed_industries.set(it);
                                supp_count++;
                        }
                        if (HasCommonValidCargo(&cid, 1, indsp->accepts_cargo, lengthof(indsp->accepts_cargo))) {
                                this->PlaceIndustry(1 + cust_count * num_indrows / num_cust, 2, it);
                                _displayed_industries.set(it);
                                cust_count++;
                        }
                }
                if (houses_supply) {
                        this->PlaceIndustry(1 + supp_count * num_indrows / num_supp, 0, NUM_INDUSTRYTYPES);
                        supp_count++;
                }
                if (houses_accept) {
                        this->PlaceIndustry(1 + cust_count * num_indrows / num_cust, 2, NUM_INDUSTRYTYPES);
                        cust_count++;
                }

                this->ShortenCargoColumn(1, 1, num_indrows);
                const NWidgetBase *nwp = this->GetWidget<NWidgetBase>(WID_IC_PANEL);
                this->vscroll->SetCount(CeilDiv(WD_FRAMETEXT_TOP + WD_FRAMETEXT_BOTTOM + CargoesField::small_height + num_indrows * CargoesField::normal_height, nwp->resize_y));
                this->SetDirty();
                this->NotifySmallmap();
        }

        /**
         * Some data on this window has become invalid.
         * @param data Information about the changed data.
         * - data = 0 .. NUM_INDUSTRYTYPES - 1: Display the chain around the given industry.
         * - data = NUM_INDUSTRYTYPES: Stop sending updates to the smallmap window.
         * @param gui_scope Whether the call is done from GUI scope. You may not do everything when not in GUI scope. See #InvalidateWindowData() for details.
         */
        virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
        {
                if (!gui_scope) return;
                if (data == NUM_INDUSTRYTYPES) {
                        if (this->IsWidgetLowered(WID_IC_NOTIFY)) {
                                this->RaiseWidget(WID_IC_NOTIFY);
                                this->SetWidgetDirty(WID_IC_NOTIFY);
                        }
                        return;
                }

                assert(data >= 0 && data < NUM_INDUSTRYTYPES);
                this->ComputeIndustryDisplay(data);
        }

        void DrawWidget (BlitArea *dpi, const Rect &r, int widget) const OVERRIDE
        {
                if (widget != WID_IC_PANEL) return;

                BlitArea tmp_dpi;
                int width = r.right - r.left + 1;
                int height = r.bottom - r.top + 1 - WD_FRAMERECT_TOP - WD_FRAMERECT_BOTTOM;
                if (!InitBlitArea (dpi, &tmp_dpi, r.left + WD_FRAMERECT_LEFT, r.top + WD_FRAMERECT_TOP, width, height)) return;

                int left_pos = WD_FRAMERECT_LEFT;
                if (this->ind_cargo >= NUM_INDUSTRYTYPES) left_pos += (CargoesField::industry_width + CargoesField::CARGO_FIELD_WIDTH) / 2;
                int last_column = (this->ind_cargo < NUM_INDUSTRYTYPES) ? 4 : 2;

                const NWidgetBase *nwp = this->GetWidget<NWidgetBase>(WID_IC_PANEL);
                int vpos = -this->vscroll->GetPosition() * nwp->resize_y;
                for (uint i = 0; i < this->fields.Length(); i++) {
                        int row_height = (i == 0) ? CargoesField::small_height : CargoesField::normal_height;
                        if (vpos + row_height >= 0) {
                                int xpos = left_pos;
                                int col, dir;
                                if (_current_text_dir == TD_RTL) {
                                        col = last_column;
                                        dir = -1;
                                } else {
                                        col = 0;
                                        dir = 1;
                                }
                                while (col >= 0 && col <= last_column) {
                                        this->fields[i].columns[col].Draw (&tmp_dpi, xpos, vpos);
                                        xpos += (col & 1) ? CargoesField::CARGO_FIELD_WIDTH : CargoesField::industry_width;
                                        col += dir;
                                }
                        }
                        vpos += row_height;
                        if (vpos >= height) break;
                }
        }

        /**
         * Calculate in which field was clicked, and within the field, at what position.
         * @param pt Clicked position in the #WID_IC_PANEL widget.
         * @param fieldxy If \c true is returned, field x/y coordinate of \a pt.
         * @param xy      If \c true is returned, x/y coordinate with in the field.
         * @return Clicked at a valid position.
         */
        bool CalculatePositionInWidget(Point pt, Point *fieldxy, Point *xy)
        {
                const NWidgetBase *nw = this->GetWidget<NWidgetBase>(WID_IC_PANEL);
                pt.x -= nw->pos_x;
                pt.y -= nw->pos_y;

                int vpos = WD_FRAMERECT_TOP + CargoesField::small_height - this->vscroll->GetPosition() * nw->resize_y;
                if (pt.y < vpos) return false;

                int row = (pt.y - vpos) / CargoesField::normal_height; // row is relative to row 1.
                if (row + 1 >= (int)this->fields.Length()) return false;
                vpos = pt.y - vpos - row * CargoesField::normal_height; // Position in the row + 1 field
                row++; // rebase row to match index of this->fields.

                int xpos = 2 * WD_FRAMERECT_LEFT + ((this->ind_cargo < NUM_INDUSTRYTYPES) ? 0 :  (CargoesField::industry_width + CargoesField::CARGO_FIELD_WIDTH) / 2);
                if (pt.x < xpos) return false;
                int column;
                for (column = 0; column <= 5; column++) {
                        int width = (column & 1) ? CargoesField::CARGO_FIELD_WIDTH : CargoesField::industry_width;
                        if (pt.x < xpos + width) break;
                        xpos += width;
                }
                int num_columns = (this->ind_cargo < NUM_INDUSTRYTYPES) ? 4 : 2;
                if (column > num_columns) return false;
                xpos = pt.x - xpos;

                /* Return both positions, compensating for RTL languages (which works due to the equal symmetry in both displays). */
                fieldxy->y = row;
                xy->y = vpos;
                if (_current_text_dir == TD_RTL) {
                        fieldxy->x = num_columns - column;
                        xy->x = ((column & 1) ? CargoesField::CARGO_FIELD_WIDTH : CargoesField::industry_width) - xpos;
                } else {
                        fieldxy->x = column;
                        xy->x = xpos;
                }
                return true;
        }

        virtual void OnClick(Point pt, int widget, int click_count)
        {
                switch (widget) {
                        case WID_IC_PANEL: {
                                Point fieldxy, xy;
                                if (!CalculatePositionInWidget(pt, &fieldxy, &xy)) return;

                                const CargoesField *fld = this->fields[fieldxy.y].columns + fieldxy.x;
                                switch (fld->type) {
                                        case CFT_INDUSTRY:
                                                if (fld->u.industry.ind_type < NUM_INDUSTRYTYPES) this->ComputeIndustryDisplay(fld->u.industry.ind_type);
                                                break;

                                        case CFT_CARGO: {
                                                CargoesField *lft = (fieldxy.x > 0) ? this->fields[fieldxy.y].columns + fieldxy.x - 1 : NULL;
                                                CargoesField *rgt = (fieldxy.x < 4) ? this->fields[fieldxy.y].columns + fieldxy.x + 1 : NULL;
                                                CargoID cid = fld->CargoClickedAt(lft, rgt, xy);
                                                if (cid != INVALID_CARGO) this->ComputeCargoDisplay(cid);
                                                break;
                                        }

                                        case CFT_CARGO_LABEL: {
                                                CargoID cid = fld->CargoLabelClickedAt(xy);
                                                if (cid != INVALID_CARGO) this->ComputeCargoDisplay(cid);
                                                break;
                                        }

                                        default:
                                                break;
                                }
                                break;
                        }

                        case WID_IC_NOTIFY:
                                this->ToggleWidgetLoweredState(WID_IC_NOTIFY);
                                this->SetWidgetDirty(WID_IC_NOTIFY);
                                if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);

                                if (this->IsWidgetLowered(WID_IC_NOTIFY)) {
                                        if (FindWindowByClass(WC_SMALLMAP) == NULL) ShowSmallMap();
                                        this->NotifySmallmap();
                                }
                                break;

                        case WID_IC_CARGO_DROPDOWN: {
                                DropDownList *lst = new DropDownList;
                                const CargoSpec *cs;
                                FOR_ALL_SORTED_STANDARD_CARGOSPECS(cs) {
                                        *lst->Append() = new DropDownListStringItem(cs->name, cs->Index(), false);
                                }
                                if (lst->Length() == 0) {
                                        delete lst;
                                        break;
                                }
                                int selected = (this->ind_cargo >= NUM_INDUSTRYTYPES) ? (int)(this->ind_cargo - NUM_INDUSTRYTYPES) : -1;
                                ShowDropDownList(this, lst, selected, WID_IC_CARGO_DROPDOWN, 0, true);
                                break;
                        }

                        case WID_IC_IND_DROPDOWN: {
                                DropDownList *lst = new DropDownList;
                                for (uint i = 0; i < NUM_INDUSTRYTYPES; i++) {
                                        IndustryType ind = _sorted_industry_types[i];
                                        const IndustrySpec *indsp = GetIndustrySpec(ind);
                                        if (!indsp->enabled) continue;
                                        *lst->Append() = new DropDownListStringItem(indsp->name, ind, false);
                                }
                                if (lst->Length() == 0) {
                                        delete lst;
                                        break;
                                }
                                int selected = (this->ind_cargo < NUM_INDUSTRYTYPES) ? (int)this->ind_cargo : -1;
                                ShowDropDownList(this, lst, selected, WID_IC_IND_DROPDOWN, 0, true);
                                break;
                        }
                }
        }

        virtual void OnDropdownSelect(int widget, int index)
        {
                if (index < 0) return;

                switch (widget) {
                        case WID_IC_CARGO_DROPDOWN:
                                this->ComputeCargoDisplay(index);
                                break;

                        case WID_IC_IND_DROPDOWN:
                                this->ComputeIndustryDisplay(index);
                                break;
                }
        }

        virtual void OnHover(Point pt, int widget)
        {
                if (widget != WID_IC_PANEL) return;

                Point fieldxy, xy;
                if (!CalculatePositionInWidget(pt, &fieldxy, &xy)) return;

                const CargoesField *fld = this->fields[fieldxy.y].columns + fieldxy.x;
                CargoID cid = INVALID_CARGO;
                switch (fld->type) {
                        case CFT_CARGO: {
                                CargoesField *lft = (fieldxy.x > 0) ? this->fields[fieldxy.y].columns + fieldxy.x - 1 : NULL;
                                CargoesField *rgt = (fieldxy.x < 4) ? this->fields[fieldxy.y].columns + fieldxy.x + 1 : NULL;
                                cid = fld->CargoClickedAt(lft, rgt, xy);
                                break;
                        }

                        case CFT_CARGO_LABEL: {
                                cid = fld->CargoLabelClickedAt(xy);
                                break;
                        }

                        case CFT_INDUSTRY:
                                if (fld->u.industry.ind_type < NUM_INDUSTRYTYPES && (this->ind_cargo >= NUM_INDUSTRYTYPES || fieldxy.x != 2)) {
                                        GuiShowTooltips(this, STR_INDUSTRY_CARGOES_INDUSTRY_TOOLTIP, 0, NULL, TCC_HOVER);
                                }
                                return;

                        default:
                                break;
                }
                if (cid != INVALID_CARGO && (this->ind_cargo < NUM_INDUSTRYTYPES || cid != this->ind_cargo - NUM_INDUSTRYTYPES)) {
                        const CargoSpec *csp = CargoSpec::Get(cid);
                        uint64 params[5];
                        params[0] = csp->name;
                        GuiShowTooltips(this, STR_INDUSTRY_CARGOES_CARGO_TOOLTIP, 1, params, TCC_HOVER);
                }
        }

        virtual void OnResize()
        {
                this->vscroll->SetCapacityFromWidget(this, WID_IC_PANEL);
        }
};

const int IndustryCargoesWindow::HOR_TEXT_PADDING  = 5; ///< Horizontal padding around the industry type text.
const int IndustryCargoesWindow::VERT_TEXT_PADDING = 5; ///< Vertical padding around the industry type text.

/**
 * Open the industry and cargoes window.
 * @param id Industry type to display, \c NUM_INDUSTRYTYPES selects a default industry type.
 */
static void ShowIndustryCargoesWindow(IndustryType id)
{
        if (id >= NUM_INDUSTRYTYPES) {
                for (uint i = 0; i < NUM_INDUSTRYTYPES; i++) {
                        const IndustrySpec *indsp = GetIndustrySpec(_sorted_industry_types[i]);
                        if (indsp->enabled) {
                                id = _sorted_industry_types[i];
                                break;
                        }
                }
                if (id >= NUM_INDUSTRYTYPES) return;
        }

        Window *w = BringWindowToFrontById(WC_INDUSTRY_CARGOES, 0);
        if (w != NULL) {
                w->InvalidateData(id);
                return;
        }
        new IndustryCargoesWindow(id);
}

/** Open the industry and cargoes window with an industry. */
void ShowIndustryCargoesWindow()
{
        ShowIndustryCargoesWindow(NUM_INDUSTRYTYPES);
}