Fix 03cc0d6: Mark level crossings dirty when removing road from them, not from bridge...

[openttd-github.git] / src / news_gui.cpp

/*
 * 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 news_gui.cpp GUI functions related to news messages. */

#include "stdafx.h"
#include "gui.h"
#include "viewport_func.h"
#include "strings_func.h"
#include "window_func.h"
#include "date_func.h"
#include "vehicle_base.h"
#include "vehicle_func.h"
#include "vehicle_gui.h"
#include "roadveh.h"
#include "station_base.h"
#include "industry.h"
#include "town.h"
#include "sound_func.h"
#include "string_func.h"
#include "widgets/dropdown_func.h"
#include "statusbar_gui.h"
#include "company_manager_face.h"
#include "company_func.h"
#include "engine_base.h"
#include "engine_gui.h"
#include "core/geometry_func.hpp"
#include "command_func.h"
#include "company_base.h"
#include "settings_internal.h"
#include "guitimer_func.h"
#include "group_gui.h"
#include "zoom_func.h"
#include "news_cmd.h"

#include "widgets/news_widget.h"

#include "table/strings.h"

#include "safeguards.h"

const NewsItem *_statusbar_news_item = nullptr;

static uint MIN_NEWS_AMOUNT = 30;        ///< preferred minimum amount of news messages
static uint MAX_NEWS_AMOUNT = 1 << 10;   ///< Do not exceed this number of news messages
static uint _total_news = 0;             ///< current number of news items
static NewsItem *_oldest_news = nullptr; ///< head of news items queue
NewsItem *_latest_news = nullptr;        ///< tail of news items queue

/**
 * Forced news item.
 * Users can force an item by accessing the history or "last message".
 * If the message being shown was forced by the user, a pointer is stored
 * in _forced_news. Otherwise, \a _forced_news variable is nullptr.
 */
static const NewsItem *_forced_news = nullptr;

/** Current news item (last item shown regularly). */
static const NewsItem *_current_news = nullptr;


/**
 * Get the position a news-reference is referencing.
 * @param reftype The type of reference.
 * @param ref     The reference.
 * @return A tile for the referenced object, or INVALID_TILE if none.
 */
static TileIndex GetReferenceTile(NewsReferenceType reftype, uint32 ref)
{
        switch (reftype) {
                case NR_TILE:     return (TileIndex)ref;
                case NR_STATION:  return Station::Get((StationID)ref)->xy;
                case NR_INDUSTRY: return Industry::Get((IndustryID)ref)->location.tile + TileDiffXY(1, 1);
                case NR_TOWN:     return Town::Get((TownID)ref)->xy;
                default:          return INVALID_TILE;
        }
}

/* Normal news items. */
static const NWidgetPart _nested_normal_news_widgets[] = {
        NWidget(WWT_PANEL, COLOUR_WHITE, WID_N_PANEL),
                NWidget(NWID_HORIZONTAL), SetPadding(1, 1, 0, 1),
                        NWidget(WWT_CLOSEBOX, COLOUR_WHITE, WID_N_CLOSEBOX), SetPadding(0, 0, 0, 1),
                        NWidget(NWID_SPACER), SetFill(1, 0),
                        NWidget(NWID_VERTICAL),
                                NWidget(WWT_LABEL, COLOUR_WHITE, WID_N_DATE), SetDataTip(STR_DATE_LONG_SMALL, STR_NULL),
                                NWidget(NWID_SPACER), SetFill(0, 1),
                        EndContainer(),
                EndContainer(),
                NWidget(WWT_EMPTY, COLOUR_WHITE, WID_N_MESSAGE), SetMinimalSize(428, 154), SetPadding(0, 5, 1, 5),
        EndContainer(),
};

static WindowDesc _normal_news_desc(
        WDP_MANUAL, nullptr, 0, 0,
        WC_NEWS_WINDOW, WC_NONE,
        0,
        _nested_normal_news_widgets, lengthof(_nested_normal_news_widgets)
);

/* New vehicles news items. */
static const NWidgetPart _nested_vehicle_news_widgets[] = {
        NWidget(WWT_PANEL, COLOUR_WHITE, WID_N_PANEL),
                NWidget(NWID_HORIZONTAL), SetPadding(1, 1, 0, 1),
                        NWidget(NWID_VERTICAL),
                                NWidget(WWT_CLOSEBOX, COLOUR_WHITE, WID_N_CLOSEBOX), SetPadding(0, 0, 0, 1),
                                NWidget(NWID_SPACER), SetFill(0, 1),
                        EndContainer(),
                        NWidget(WWT_LABEL, COLOUR_WHITE, WID_N_VEH_TITLE), SetFill(1, 1), SetMinimalSize(419, 55), SetDataTip(STR_EMPTY, STR_NULL),
                EndContainer(),
                NWidget(WWT_PANEL, COLOUR_WHITE, WID_N_VEH_BKGND), SetPadding(0, 25, 1, 25),
                        NWidget(NWID_VERTICAL),
                                NWidget(WWT_EMPTY, INVALID_COLOUR, WID_N_VEH_NAME), SetMinimalSize(369, 33), SetFill(1, 0),
                                NWidget(WWT_EMPTY, INVALID_COLOUR, WID_N_VEH_SPR),  SetMinimalSize(369, 32), SetFill(1, 0),
                                NWidget(WWT_EMPTY, INVALID_COLOUR, WID_N_VEH_INFO), SetMinimalSize(369, 46), SetFill(1, 0),
                        EndContainer(),
                EndContainer(),
        EndContainer(),
};

static WindowDesc _vehicle_news_desc(
        WDP_MANUAL, nullptr, 0, 0,
        WC_NEWS_WINDOW, WC_NONE,
        0,
        _nested_vehicle_news_widgets, lengthof(_nested_vehicle_news_widgets)
);

/* Company news items. */
static const NWidgetPart _nested_company_news_widgets[] = {
        NWidget(WWT_PANEL, COLOUR_WHITE, WID_N_PANEL),
                NWidget(NWID_HORIZONTAL), SetPadding(1, 1, 0, 1),
                        NWidget(NWID_VERTICAL),
                                NWidget(WWT_CLOSEBOX, COLOUR_WHITE, WID_N_CLOSEBOX), SetPadding(0, 0, 0, 1),
                                NWidget(NWID_SPACER), SetFill(0, 1),
                        EndContainer(),
                        NWidget(WWT_LABEL, COLOUR_WHITE, WID_N_TITLE), SetFill(1, 1), SetMinimalSize(410, 20), SetDataTip(STR_EMPTY, STR_NULL),
                EndContainer(),
                NWidget(NWID_HORIZONTAL), SetPadding(0, 1, 1, 1),
                        NWidget(NWID_VERTICAL),
                                NWidget(WWT_EMPTY, COLOUR_WHITE, WID_N_MGR_FACE), SetMinimalSize(93, 119), SetPadding(2, 6, 2, 1),
                                NWidget(WWT_EMPTY, COLOUR_WHITE, WID_N_MGR_NAME), SetMinimalSize(93, 24), SetPadding(0, 0, 0, 1),
                                NWidget(NWID_SPACER), SetFill(0, 1),
                        EndContainer(),
                        NWidget(WWT_EMPTY, COLOUR_WHITE, WID_N_COMPANY_MSG), SetFill(1, 1), SetMinimalSize(328, 150),
                EndContainer(),
        EndContainer(),
};

static WindowDesc _company_news_desc(
        WDP_MANUAL, nullptr, 0, 0,
        WC_NEWS_WINDOW, WC_NONE,
        0,
        _nested_company_news_widgets, lengthof(_nested_company_news_widgets)
);

/* Thin news items. */
static const NWidgetPart _nested_thin_news_widgets[] = {
        NWidget(WWT_PANEL, COLOUR_WHITE, WID_N_PANEL),
                NWidget(NWID_HORIZONTAL), SetPadding(1, 1, 0, 1),
                        NWidget(WWT_CLOSEBOX, COLOUR_WHITE, WID_N_CLOSEBOX), SetPadding(0, 0, 0, 1),
                        NWidget(NWID_SPACER), SetFill(1, 0),
                        NWidget(NWID_VERTICAL),
                                NWidget(WWT_LABEL, COLOUR_WHITE, WID_N_DATE), SetDataTip(STR_DATE_LONG_SMALL, STR_NULL),
                                NWidget(NWID_SPACER), SetFill(0, 1),
                        EndContainer(),
                EndContainer(),
                NWidget(WWT_EMPTY, COLOUR_WHITE, WID_N_MESSAGE), SetMinimalSize(428, 48), SetFill(1, 0), SetPadding(0, 5, 0, 5),
                NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_N_VIEWPORT), SetMinimalSize(426, 70), SetPadding(1, 2, 2, 2),
        EndContainer(),
};

static WindowDesc _thin_news_desc(
        WDP_MANUAL, nullptr, 0, 0,
        WC_NEWS_WINDOW, WC_NONE,
        0,
        _nested_thin_news_widgets, lengthof(_nested_thin_news_widgets)
);

/* Small news items. */
static const NWidgetPart _nested_small_news_widgets[] = {
        /* Caption + close box. The caption is no WWT_CAPTION as the window shall not be moveable and so on. */
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_LIGHT_BLUE, WID_N_CLOSEBOX),
                NWidget(WWT_EMPTY, COLOUR_LIGHT_BLUE, WID_N_CAPTION), SetFill(1, 0),
                NWidget(WWT_TEXTBTN, COLOUR_LIGHT_BLUE, WID_N_SHOW_GROUP), SetMinimalSize(14, 11), SetResize(1, 0),
                                SetDataTip(STR_NULL /* filled in later */, STR_NEWS_SHOW_VEHICLE_GROUP_TOOLTIP),
        EndContainer(),

        /* Main part */
        NWidget(WWT_PANEL, COLOUR_LIGHT_BLUE, WID_N_HEADLINE),
                NWidget(WWT_INSET, COLOUR_LIGHT_BLUE, WID_N_INSET), SetPadding(2, 2, 2, 2),
                        NWidget(NWID_VIEWPORT, INVALID_COLOUR, WID_N_VIEWPORT), SetMinimalSize(274, 47), SetFill(1, 0),
                EndContainer(),
                NWidget(WWT_EMPTY, COLOUR_WHITE, WID_N_MESSAGE), SetMinimalSize(275, 20), SetFill(1, 0), SetPadding(0, 5, 0, 5),
        EndContainer(),
};

static WindowDesc _small_news_desc(
        WDP_MANUAL, nullptr, 0, 0,
        WC_NEWS_WINDOW, WC_NONE,
        0,
        _nested_small_news_widgets, lengthof(_nested_small_news_widgets)
);

/**
 * Window layouts for news items.
 */
static WindowDesc* _news_window_layout[] = {
        &_thin_news_desc,    ///< NF_THIN
        &_small_news_desc,   ///< NF_SMALL
        &_normal_news_desc,  ///< NF_NORMAL
        &_vehicle_news_desc, ///< NF_VEHICLE
        &_company_news_desc, ///< NF_COMPANY
};

WindowDesc* GetNewsWindowLayout(NewsFlag flags)
{
        uint layout = GB(flags, NFB_WINDOW_LAYOUT, NFB_WINDOW_LAYOUT_COUNT);
        assert(layout < lengthof(_news_window_layout));
        return _news_window_layout[layout];
}

/**
 * Per-NewsType data
 */
static NewsTypeData _news_type_data[] = {
        /*            name,                           age, sound,          */
        NewsTypeData("news_display.arrival_player",    60, SND_1D_APPLAUSE ),  ///< NT_ARRIVAL_COMPANY
        NewsTypeData("news_display.arrival_other",     60, SND_1D_APPLAUSE ),  ///< NT_ARRIVAL_OTHER
        NewsTypeData("news_display.accident",          90, SND_BEGIN       ),  ///< NT_ACCIDENT
        NewsTypeData("news_display.accident_other",    90, SND_BEGIN       ),  ///< NT_ACCIDENT_OTHER
        NewsTypeData("news_display.company_info",      60, SND_BEGIN       ),  ///< NT_COMPANY_INFO
        NewsTypeData("news_display.open",              90, SND_BEGIN       ),  ///< NT_INDUSTRY_OPEN
        NewsTypeData("news_display.close",             90, SND_BEGIN       ),  ///< NT_INDUSTRY_CLOSE
        NewsTypeData("news_display.economy",           30, SND_BEGIN       ),  ///< NT_ECONOMY
        NewsTypeData("news_display.production_player", 30, SND_BEGIN       ),  ///< NT_INDUSTRY_COMPANY
        NewsTypeData("news_display.production_other",  30, SND_BEGIN       ),  ///< NT_INDUSTRY_OTHER
        NewsTypeData("news_display.production_nobody", 30, SND_BEGIN       ),  ///< NT_INDUSTRY_NOBODY
        NewsTypeData("news_display.advice",           150, SND_BEGIN       ),  ///< NT_ADVICE
        NewsTypeData("news_display.new_vehicles",      30, SND_1E_NEW_ENGINE), ///< NT_NEW_VEHICLES
        NewsTypeData("news_display.acceptance",        90, SND_BEGIN       ),  ///< NT_ACCEPTANCE
        NewsTypeData("news_display.subsidies",        180, SND_BEGIN       ),  ///< NT_SUBSIDIES
        NewsTypeData("news_display.general",           60, SND_BEGIN       ),  ///< NT_GENERAL
};

static_assert(lengthof(_news_type_data) == NT_END);

/**
 * Return the news display option.
 * @return display options
 */
NewsDisplay NewsTypeData::GetDisplay() const
{
        const SettingDesc *sd = GetSettingFromName(this->name);
        assert(sd != nullptr && sd->IsIntSetting());
        return (NewsDisplay)sd->AsIntSetting()->Read(nullptr);
}

/** Window class displaying a news item. */
struct NewsWindow : Window {
        uint16 chat_height;   ///< Height of the chat window.
        uint16 status_height; ///< Height of the status bar window
        const NewsItem *ni;   ///< News item to display.
        static int duration;  ///< Remaining time for showing the current news message (may only be access while a news item is displayed).

        static const uint TIMER_INTERVAL = 210; ///< Scrolling interval, scaled by line text line height. This value chosen to maintain the 15ms at normal zoom.
        GUITimer timer;

        NewsWindow(WindowDesc *desc, const NewsItem *ni) : Window(desc), ni(ni)
        {
                NewsWindow::duration = 16650;
                const Window *w = FindWindowByClass(WC_SEND_NETWORK_MSG);
                this->chat_height = (w != nullptr) ? w->height : 0;
                this->status_height = FindWindowById(WC_STATUS_BAR, 0)->height;

                this->flags |= WF_DISABLE_VP_SCROLL;

                this->CreateNestedTree();

                /* For company news with a face we have a separate headline in param[0] */
                if (desc == &_company_news_desc) this->GetWidget<NWidgetCore>(WID_N_TITLE)->widget_data = this->ni->params[0];

                NWidgetCore *nwid = this->GetWidget<NWidgetCore>(WID_N_SHOW_GROUP);
                if (ni->reftype1 == NR_VEHICLE && nwid != nullptr) {
                        const Vehicle *v = Vehicle::Get(ni->ref1);
                        switch (v->type) {
                                case VEH_TRAIN:
                                        nwid->widget_data = STR_TRAIN;
                                        break;
                                case VEH_ROAD:
                                        nwid->widget_data = RoadVehicle::From(v)->IsBus() ? STR_BUS : STR_LORRY;
                                        break;
                                case VEH_SHIP:
                                        nwid->widget_data = STR_SHIP;
                                        break;
                                case VEH_AIRCRAFT:
                                        nwid->widget_data = STR_PLANE;
                                        break;
                                default:
                                        break; // Do nothing
                        }
                }

                this->FinishInitNested(0);

                /* Initialize viewport if it exists. */
                NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_N_VIEWPORT);
                if (nvp != nullptr) {
                        nvp->InitializeViewport(this, ni->reftype1 == NR_VEHICLE ? 0x80000000 | ni->ref1 : (uint32)GetReferenceTile(ni->reftype1, ni->ref1),ScaleZoomGUI(ZOOM_LVL_NEWS));
                        if (this->ni->flags & NF_NO_TRANSPARENT) nvp->disp_flags |= ND_NO_TRANSPARENCY;
                        if ((this->ni->flags & NF_INCOLOUR) == 0) {
                                nvp->disp_flags |= ND_SHADE_GREY;
                        } else if (this->ni->flags & NF_SHADE) {
                                nvp->disp_flags |= ND_SHADE_DIMMED;
                        }
                }

                PositionNewsMessage(this);
        }

        void OnInit() override
        {
                this->timer.SetInterval(TIMER_INTERVAL / FONT_HEIGHT_NORMAL);
        }

        void DrawNewsBorder(const Rect &r) const
        {
                GfxFillRect(r.left,  r.top,    r.right, r.bottom, PC_WHITE);

                GfxFillRect(r.left,  r.top,    r.left,  r.bottom, PC_BLACK);
                GfxFillRect(r.right, r.top,    r.right, r.bottom, PC_BLACK);
                GfxFillRect(r.left,  r.top,    r.right, r.top,    PC_BLACK);
                GfxFillRect(r.left,  r.bottom, r.right, r.bottom, PC_BLACK);
        }

        Point OnInitialPosition(int16 sm_width, int16 sm_height, int window_number) override
        {
                Point pt = { 0, _screen.height };
                return pt;
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                StringID str = STR_NULL;
                switch (widget) {
                        case WID_N_CAPTION: {
                                /* Caption is not a real caption (so that the window cannot be moved)
                                 * thus it doesn't get the default sizing of a caption. */
                                Dimension d2 = GetStringBoundingBox(STR_NEWS_MESSAGE_CAPTION);
                                d2.height += WD_CAPTIONTEXT_TOP + WD_CAPTIONTEXT_BOTTOM;
                                *size = maxdim(*size, d2);
                                return;
                        }

                        case WID_N_MGR_FACE:
                                *size = maxdim(*size, GetSpriteSize(SPR_GRADIENT));
                                break;

                        case WID_N_MGR_NAME:
                                SetDParamStr(0, static_cast<const CompanyNewsInformation *>(this->ni->data.get())->president_name);
                                str = STR_JUST_RAW_STRING;
                                break;

                        case WID_N_MESSAGE:
                                CopyInDParam(0, this->ni->params, lengthof(this->ni->params));
                                str = this->ni->string_id;
                                break;

                        case WID_N_COMPANY_MSG:
                                str = this->GetCompanyMessageString();
                                break;

                        case WID_N_VEH_NAME:
                        case WID_N_VEH_TITLE:
                                str = this->GetNewVehicleMessageString(widget);
                                break;

                        case WID_N_VEH_INFO: {
                                assert(this->ni->reftype1 == NR_ENGINE);
                                EngineID engine = this->ni->ref1;
                                str = GetEngineInfoString(engine);
                                break;
                        }

                        case WID_N_SHOW_GROUP:
                                if (this->ni->reftype1 == NR_VEHICLE) {
                                        Dimension d2 = GetStringBoundingBox(this->GetWidget<NWidgetCore>(WID_N_SHOW_GROUP)->widget_data);
                                        d2.height += WD_CAPTIONTEXT_TOP + WD_CAPTIONTEXT_BOTTOM;
                                        d2.width += WD_CAPTIONTEXT_LEFT + WD_CAPTIONTEXT_RIGHT;
                                        *size = d2;
                                } else {
                                        /* Hide 'Show group window' button if this news is not about a vehicle. */
                                        size->width = 0;
                                        size->height = 0;
                                        resize->width = 0;
                                        resize->height = 0;
                                        fill->width = 0;
                                        fill->height = 0;
                                }
                                return;

                        default:
                                return; // Do nothing
                }

                /* Update minimal size with length of the multi-line string. */
                Dimension d = *size;
                d.width = (d.width >= padding.width) ? d.width - padding.width : 0;
                d.height = (d.height >= padding.height) ? d.height - padding.height : 0;
                d = GetStringMultiLineBoundingBox(str, d);
                d.width += padding.width;
                d.height += padding.height;
                *size = maxdim(*size, d);
        }

        void SetStringParameters(int widget) const override
        {
                if (widget == WID_N_DATE) SetDParam(0, this->ni->date);
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                switch (widget) {
                        case WID_N_CAPTION:
                                DrawCaption(r, COLOUR_LIGHT_BLUE, this->owner, TC_FROMSTRING, STR_NEWS_MESSAGE_CAPTION, SA_CENTER);
                                break;

                        case WID_N_PANEL:
                                this->DrawNewsBorder(r);
                                break;

                        case WID_N_MESSAGE:
                                CopyInDParam(0, this->ni->params, lengthof(this->ni->params));
                                DrawStringMultiLine(r.left, r.right, r.top, r.bottom, this->ni->string_id, TC_FROMSTRING, SA_CENTER);
                                break;

                        case WID_N_MGR_FACE: {
                                const CompanyNewsInformation *cni = static_cast<const CompanyNewsInformation*>(this->ni->data.get());
                                DrawCompanyManagerFace(cni->face, cni->colour, r.left, r.top);
                                GfxFillRect(r.left, r.top, r.right, r.bottom, PALETTE_NEWSPAPER, FILLRECT_RECOLOUR);
                                break;
                        }
                        case WID_N_MGR_NAME: {
                                const CompanyNewsInformation *cni = static_cast<const CompanyNewsInformation*>(this->ni->data.get());
                                SetDParamStr(0, cni->president_name);
                                DrawStringMultiLine(r.left, r.right, r.top, r.bottom, STR_JUST_RAW_STRING, TC_FROMSTRING, SA_CENTER);
                                break;
                        }
                        case WID_N_COMPANY_MSG:
                                DrawStringMultiLine(r.left, r.right, r.top, r.bottom, this->GetCompanyMessageString(), TC_FROMSTRING, SA_CENTER);
                                break;

                        case WID_N_VEH_BKGND:
                                GfxFillRect(r.left, r.top, r.right, r.bottom, PC_GREY);
                                break;

                        case WID_N_VEH_NAME:
                        case WID_N_VEH_TITLE:
                                DrawStringMultiLine(r.left, r.right, r.top, r.bottom, this->GetNewVehicleMessageString(widget), TC_FROMSTRING, SA_CENTER);
                                break;

                        case WID_N_VEH_SPR: {
                                assert(this->ni->reftype1 == NR_ENGINE);
                                EngineID engine = this->ni->ref1;
                                DrawVehicleEngine(r.left, r.right, (r.left + r.right) / 2, (r.top + r.bottom) / 2, engine, GetEnginePalette(engine, _local_company), EIT_PREVIEW);
                                GfxFillRect(r.left, r.top, r.right, r.bottom, PALETTE_NEWSPAPER, FILLRECT_RECOLOUR);
                                break;
                        }
                        case WID_N_VEH_INFO: {
                                assert(this->ni->reftype1 == NR_ENGINE);
                                EngineID engine = this->ni->ref1;
                                DrawStringMultiLine(r.left, r.right, r.top, r.bottom, GetEngineInfoString(engine), TC_FROMSTRING, SA_CENTER);
                                break;
                        }
                }
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                switch (widget) {
                        case WID_N_CLOSEBOX:
                                NewsWindow::duration = 0;
                                this->Close();
                                _forced_news = nullptr;
                                break;

                        case WID_N_CAPTION:
                                if (this->ni->reftype1 == NR_VEHICLE) {
                                        const Vehicle *v = Vehicle::Get(this->ni->ref1);
                                        ShowVehicleViewWindow(v);
                                }
                                break;

                        case WID_N_VIEWPORT:
                                break; // Ignore clicks

                        case WID_N_SHOW_GROUP:
                                if (this->ni->reftype1 == NR_VEHICLE) {
                                        const Vehicle *v = Vehicle::Get(this->ni->ref1);
                                        ShowCompanyGroupForVehicle(v);
                                }
                                break;
                        default:
                                if (this->ni->reftype1 == NR_VEHICLE) {
                                        const Vehicle *v = Vehicle::Get(this->ni->ref1);
                                        ScrollMainWindowTo(v->x_pos, v->y_pos, v->z_pos);
                                } else {
                                        TileIndex tile1 = GetReferenceTile(this->ni->reftype1, this->ni->ref1);
                                        TileIndex tile2 = GetReferenceTile(this->ni->reftype2, this->ni->ref2);
                                        if (_ctrl_pressed) {
                                                if (tile1 != INVALID_TILE) ShowExtraViewportWindow(tile1);
                                                if (tile2 != INVALID_TILE) ShowExtraViewportWindow(tile2);
                                        } else {
                                                if ((tile1 == INVALID_TILE || !ScrollMainWindowToTile(tile1)) && tile2 != INVALID_TILE) {
                                                        ScrollMainWindowToTile(tile2);
                                                }
                                        }
                                }
                                break;
                }
        }

        void OnResize() override
        {
                if (this->viewport != nullptr) {
                        NWidgetViewport *nvp = this->GetWidget<NWidgetViewport>(WID_N_VIEWPORT);
                        nvp->UpdateViewportCoordinates(this);

                        if (ni->reftype1 != NR_VEHICLE) {
                                ScrollWindowToTile(GetReferenceTile(ni->reftype1, ni->ref1), this, true); // Re-center viewport.
                        }
                }
        }

        /**
         * 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.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (!gui_scope) return;
                /* The chatbar has notified us that is was either created or closed */
                int newtop = this->top + this->chat_height - data;
                this->chat_height = data;
                this->SetWindowTop(newtop);
        }

        void OnRealtimeTick(uint delta_ms) override
        {
                int count = this->timer.CountElapsed(delta_ms);
                if (count > 0) {
                        /* Scroll up newsmessages from the bottom */
                        int newtop = std::max(this->top - 2 * count, _screen.height - this->height - this->status_height - this->chat_height);
                        this->SetWindowTop(newtop);
                }

                /* Decrement the news timer. We don't need to action an elapsed event here,
                 * so no need to use TimerElapsed(). */
                if (NewsWindow::duration > 0) NewsWindow::duration -= delta_ms;
        }

private:
        /**
         * Moves the window to a new #top coordinate. Makes screen dirty where needed.
         * @param newtop new top coordinate
         */
        void SetWindowTop(int newtop)
        {
                if (this->top == newtop) return;

                int mintop = std::min(newtop, this->top);
                int maxtop = std::max(newtop, this->top);
                if (this->viewport != nullptr) this->viewport->top += newtop - this->top;
                this->top = newtop;

                AddDirtyBlock(this->left, mintop, this->left + this->width, maxtop + this->height);
        }

        StringID GetCompanyMessageString() const
        {
                /* Company news with a face have a separate headline, so the normal message is shifted by two params */
                CopyInDParam(0, this->ni->params + 2, lengthof(this->ni->params) - 2);
                return this->ni->params[1];
        }

        StringID GetNewVehicleMessageString(int widget) const
        {
                assert(this->ni->reftype1 == NR_ENGINE);
                EngineID engine = this->ni->ref1;

                switch (widget) {
                        case WID_N_VEH_TITLE:
                                SetDParam(0, GetEngineCategoryName(engine));
                                return STR_NEWS_NEW_VEHICLE_NOW_AVAILABLE;

                        case WID_N_VEH_NAME:
                                SetDParam(0, engine);
                                return STR_NEWS_NEW_VEHICLE_TYPE;

                        default:
                                NOT_REACHED();
                }
        }
};

/* static */ int NewsWindow::duration = 0; // Instance creation.

/** Open up an own newspaper window for the news item */
static void ShowNewspaper(const NewsItem *ni)
{
        SoundFx sound = _news_type_data[ni->type].sound;
        if (sound != 0 && _settings_client.sound.news_full) SndPlayFx(sound);

        new NewsWindow(GetNewsWindowLayout(ni->flags), ni);
}

/** Show news item in the ticker */
static void ShowTicker(const NewsItem *ni)
{
        if (_settings_client.sound.news_ticker) SndPlayFx(SND_16_NEWS_TICKER);

        _statusbar_news_item = ni;
        InvalidateWindowData(WC_STATUS_BAR, 0, SBI_SHOW_TICKER);
}

/** Initialize the news-items data structures */
void InitNewsItemStructs()
{
        for (NewsItem *ni = _oldest_news; ni != nullptr; ) {
                NewsItem *next = ni->next;
                delete ni;
                ni = next;
        }

        _total_news = 0;
        _oldest_news = nullptr;
        _latest_news = nullptr;
        _forced_news = nullptr;
        _current_news = nullptr;
        _statusbar_news_item = nullptr;
        NewsWindow::duration = 0;
}

/**
 * Are we ready to show another ticker item?
 * Only if nothing is in the newsticker is displayed
 */
static bool ReadyForNextTickerItem()
{
        const NewsItem *ni = _statusbar_news_item;
        if (ni == nullptr) return true;

        /* Ticker message
         * Check if the status bar message is still being displayed? */
        return !IsNewsTickerShown();
}

/**
 * Are we ready to show another news item?
 * Only if no newspaper is displayed
 */
static bool ReadyForNextNewsItem()
{
        const NewsItem *ni = _forced_news == nullptr ? _current_news : _forced_news;
        if (ni == nullptr) return true;

        /* neither newsticker nor newspaper are running */
        return (NewsWindow::duration <= 0 || FindWindowById(WC_NEWS_WINDOW, 0) == nullptr);
}

/** Move to the next ticker item */
static void MoveToNextTickerItem()
{
        /* There is no status bar, so no reason to show news;
         * especially important with the end game screen when
         * there is no status bar but possible news. */
        if (FindWindowById(WC_STATUS_BAR, 0) == nullptr) return;

        /* if we're not at the last item, then move on */
        while (_statusbar_news_item != _latest_news) {
                _statusbar_news_item = (_statusbar_news_item == nullptr) ? _oldest_news : _statusbar_news_item->next;
                const NewsItem *ni = _statusbar_news_item;
                const NewsType type = ni->type;

                /* check the date, don't show too old items */
                if (_date - _news_type_data[type].age > ni->date) continue;

                switch (_news_type_data[type].GetDisplay()) {
                        default: NOT_REACHED();
                        case ND_OFF: // Off - show nothing only a small reminder in the status bar
                                InvalidateWindowData(WC_STATUS_BAR, 0, SBI_SHOW_REMINDER);
                                break;

                        case ND_SUMMARY: // Summary - show ticker
                                ShowTicker(ni);
                                break;

                        case ND_FULL: // Full - show newspaper, skipped here
                                continue;
                }
                return;
        }
}

/** Move to the next news item */
static void MoveToNextNewsItem()
{
        /* There is no status bar, so no reason to show news;
         * especially important with the end game screen when
         * there is no status bar but possible news. */
        if (FindWindowById(WC_STATUS_BAR, 0) == nullptr) return;

        CloseWindowById(WC_NEWS_WINDOW, 0); // close the newspapers window if shown
        _forced_news = nullptr;

        /* if we're not at the last item, then move on */
        while (_current_news != _latest_news) {
                _current_news = (_current_news == nullptr) ? _oldest_news : _current_news->next;
                const NewsItem *ni = _current_news;
                const NewsType type = ni->type;

                /* check the date, don't show too old items */
                if (_date - _news_type_data[type].age > ni->date) continue;

                switch (_news_type_data[type].GetDisplay()) {
                        default: NOT_REACHED();
                        case ND_OFF: // Off - show nothing only a small reminder in the status bar, skipped here
                                continue;

                        case ND_SUMMARY: // Summary - show ticker, skipped here
                                continue;

                        case ND_FULL: // Full - show newspaper
                                ShowNewspaper(ni);
                                break;
                }
                return;
        }
}

/** Delete a news item from the queue */
static void DeleteNewsItem(NewsItem *ni)
{
        /* Delete the news from the news queue. */
        if (ni->prev != nullptr) {
                ni->prev->next = ni->next;
        } else {
                assert(_oldest_news == ni);
                _oldest_news = ni->next;
        }

        if (ni->next != nullptr) {
                ni->next->prev = ni->prev;
        } else {
                assert(_latest_news == ni);
                _latest_news = ni->prev;
        }

        _total_news--;

        if (_forced_news == ni || _current_news == ni) {
                /* When we're the current news, go to the previous item first;
                 * we just possibly made that the last news item. */
                if (_current_news == ni) _current_news = ni->prev;

                /* About to remove the currently forced item (shown as newspapers) ||
                 * about to remove the currently displayed item (newspapers) */
                MoveToNextNewsItem();
        }

        if (_statusbar_news_item == ni) {
                /* When we're the current news, go to the previous item first;
                 * we just possibly made that the last news item. */
                _statusbar_news_item = ni->prev;

                /* About to remove the currently displayed item (ticker, or just a reminder) */
                InvalidateWindowData(WC_STATUS_BAR, 0, SBI_NEWS_DELETED); // invalidate the statusbar
                MoveToNextTickerItem();
        }

        delete ni;

        SetWindowDirty(WC_MESSAGE_HISTORY, 0);
}

/**
 * Create a new newsitem to be shown.
 * @param string_id String to display.
 * @param type      The type of news.
 * @param flags     Flags related to how to display the news.
 * @param reftype1  Type of ref1.
 * @param ref1      Reference 1 to some object: Used for a possible viewport, scrolling after clicking on the news, and for deleting the news when the object is deleted.
 * @param reftype2  Type of ref2.
 * @param ref2      Reference 2 to some object: Used for scrolling after clicking on the news, and for deleting the news when the object is deleted.
 * @param data      Pointer to data that must be released once the news message is cleared.
 *
 * @see NewsSubtype
 */
NewsItem::NewsItem(StringID string_id, NewsType type, NewsFlag flags, NewsReferenceType reftype1, uint32 ref1, NewsReferenceType reftype2, uint32 ref2, const NewsAllocatedData *data) :
        string_id(string_id), date(_date), type(type), flags(flags), reftype1(reftype1), reftype2(reftype2), ref1(ref1), ref2(ref2), data(data)
{
        /* show this news message in colour? */
        if (_cur_year >= _settings_client.gui.coloured_news_year) this->flags |= NF_INCOLOUR;
        CopyOutDParam(this->params, 0, lengthof(this->params));
}

/**
 * Add a new newsitem to be shown.
 * @param string String to display
 * @param type news category
 * @param flags display flags for the news
 * @param reftype1 Type of ref1
 * @param ref1     Reference 1 to some object: Used for a possible viewport, scrolling after clicking on the news, and for deleting the news when the object is deleted.
 * @param reftype2 Type of ref2
 * @param ref2     Reference 2 to some object: Used for scrolling after clicking on the news, and for deleting the news when the object is deleted.
 * @param data     Pointer to data that must be released once the news message is cleared.
 *
 * @see NewsSubtype
 */
void AddNewsItem(StringID string, NewsType type, NewsFlag flags, NewsReferenceType reftype1, uint32 ref1, NewsReferenceType reftype2, uint32 ref2, const NewsAllocatedData *data)
{
        if (_game_mode == GM_MENU) return;

        /* Create new news item node */
        NewsItem *ni = new NewsItem(string, type, flags, reftype1, ref1, reftype2, ref2, data);

        if (_total_news++ == 0) {
                assert(_oldest_news == nullptr);
                _oldest_news = ni;
                ni->prev = nullptr;
        } else {
                assert(_latest_news->next == nullptr);
                _latest_news->next = ni;
                ni->prev = _latest_news;
        }

        ni->next = nullptr;
        _latest_news = ni;

        /* Keep the number of stored news items to a managable number */
        if (_total_news > MAX_NEWS_AMOUNT) {
                DeleteNewsItem(_oldest_news);
        }

        SetWindowDirty(WC_MESSAGE_HISTORY, 0);
}

/**
 * Create a new custom news item.
 * @param flags type of operation
 * @aram type NewsType of the message.
 * @param reftype1 NewsReferenceType of first reference.
 * @param company Company this news message is for.
 * @param reference First reference of the news message.
 * @param text The text of the news message.
 * @return the cost of this operation or an error
 */
CommandCost CmdCustomNewsItem(DoCommandFlag flags, NewsType type, NewsReferenceType reftype1, CompanyID company, uint32 reference, const std::string &text)
{
        if (_current_company != OWNER_DEITY) return CMD_ERROR;

        if (company != INVALID_OWNER && !Company::IsValidID(company)) return CMD_ERROR;
        if (type >= NT_END) return CMD_ERROR;
        if (text.empty()) return CMD_ERROR;

        switch (reftype1) {
                case NR_NONE: break;
                case NR_TILE:
                        if (!IsValidTile(reference)) return CMD_ERROR;
                        break;

                case NR_VEHICLE:
                        if (!Vehicle::IsValidID(reference)) return CMD_ERROR;
                        break;

                case NR_STATION:
                        if (!Station::IsValidID(reference)) return CMD_ERROR;
                        break;

                case NR_INDUSTRY:
                        if (!Industry::IsValidID(reference)) return CMD_ERROR;
                        break;

                case NR_TOWN:
                        if (!Town::IsValidID(reference)) return CMD_ERROR;
                        break;

                case NR_ENGINE:
                        if (!Engine::IsValidID(reference)) return CMD_ERROR;
                        break;

                default: return CMD_ERROR;
        }

        if (company != INVALID_OWNER && company != _local_company) return CommandCost();

        if (flags & DC_EXEC) {
                NewsStringData *news = new NewsStringData(text);
                SetDParamStr(0, news->string);
                AddNewsItem(STR_NEWS_CUSTOM_ITEM, type, NF_NORMAL, reftype1, reference, NR_NONE, UINT32_MAX, news);
        }

        return CommandCost();
}

/**
 * Delete a news item type about a vehicle.
 * When the news item type is INVALID_STRING_ID all news about the vehicle gets deleted.
 * @param vid  The vehicle to remove the news for.
 * @param news The news type to remove.
 */
void DeleteVehicleNews(VehicleID vid, StringID news)
{
        NewsItem *ni = _oldest_news;

        while (ni != nullptr) {
                NewsItem *next = ni->next;
                if (((ni->reftype1 == NR_VEHICLE && ni->ref1 == vid) || (ni->reftype2 == NR_VEHICLE && ni->ref2 == vid)) &&
                                (news == INVALID_STRING_ID || ni->string_id == news)) {
                        DeleteNewsItem(ni);
                }
                ni = next;
        }
}

/**
 * Remove news regarding given station so there are no 'unknown station now accepts Mail'
 * or 'First train arrived at unknown station' news items.
 * @param sid station to remove news about
 */
void DeleteStationNews(StationID sid)
{
        NewsItem *ni = _oldest_news;

        while (ni != nullptr) {
                NewsItem *next = ni->next;
                if ((ni->reftype1 == NR_STATION && ni->ref1 == sid) || (ni->reftype2 == NR_STATION && ni->ref2 == sid)) {
                        DeleteNewsItem(ni);
                }
                ni = next;
        }
}

/**
 * Remove news regarding given industry
 * @param iid industry to remove news about
 */
void DeleteIndustryNews(IndustryID iid)
{
        NewsItem *ni = _oldest_news;

        while (ni != nullptr) {
                NewsItem *next = ni->next;
                if ((ni->reftype1 == NR_INDUSTRY && ni->ref1 == iid) || (ni->reftype2 == NR_INDUSTRY && ni->ref2 == iid)) {
                        DeleteNewsItem(ni);
                }
                ni = next;
        }
}

/**
 * Remove engine announcements for invalid engines.
 */
void DeleteInvalidEngineNews()
{
        NewsItem *ni = _oldest_news;

        while (ni != nullptr) {
                NewsItem *next = ni->next;
                if ((ni->reftype1 == NR_ENGINE && (!Engine::IsValidID(ni->ref1) || !Engine::Get(ni->ref1)->IsEnabled())) ||
                                (ni->reftype2 == NR_ENGINE && (!Engine::IsValidID(ni->ref2) || !Engine::Get(ni->ref2)->IsEnabled()))) {
                        DeleteNewsItem(ni);
                }
                ni = next;
        }
}

static void RemoveOldNewsItems()
{
        NewsItem *next;
        for (NewsItem *cur = _oldest_news; _total_news > MIN_NEWS_AMOUNT && cur != nullptr; cur = next) {
                next = cur->next;
                if (_date - _news_type_data[cur->type].age * _settings_client.gui.news_message_timeout > cur->date) DeleteNewsItem(cur);
        }
}

/**
 * Report a change in vehicle IDs (due to autoreplace) to affected vehicle news.
 * @note Viewports of currently displayed news is changed via #ChangeVehicleViewports
 * @param from_index the old vehicle ID
 * @param to_index the new vehicle ID
 */
void ChangeVehicleNews(VehicleID from_index, VehicleID to_index)
{
        for (NewsItem *ni = _oldest_news; ni != nullptr; ni = ni->next) {
                if (ni->reftype1 == NR_VEHICLE && ni->ref1 == from_index) ni->ref1 = to_index;
                if (ni->reftype2 == NR_VEHICLE && ni->ref2 == from_index) ni->ref2 = to_index;
                if (ni->flags & NF_VEHICLE_PARAM0 && ni->params[0] == from_index) ni->params[0] = to_index;
        }
}

void NewsLoop()
{
        /* no news item yet */
        if (_total_news == 0) return;

        static byte _last_clean_month = 0;

        if (_last_clean_month != _cur_month) {
                RemoveOldNewsItems();
                _last_clean_month = _cur_month;
        }

        if (ReadyForNextTickerItem()) MoveToNextTickerItem();
        if (ReadyForNextNewsItem()) MoveToNextNewsItem();
}

/** Do a forced show of a specific message */
static void ShowNewsMessage(const NewsItem *ni)
{
        assert(_total_news != 0);

        /* Delete the news window */
        CloseWindowById(WC_NEWS_WINDOW, 0);

        /* setup forced news item */
        _forced_news = ni;

        if (_forced_news != nullptr) {
                CloseWindowById(WC_NEWS_WINDOW, 0);
                ShowNewspaper(ni);
        }
}

/**
 * Close active news message window
 * @return true if a window was closed.
 */
bool HideActiveNewsMessage() {
        NewsWindow *w = (NewsWindow*)FindWindowById(WC_NEWS_WINDOW, 0);
        if (w == nullptr) return false;
        w->Close();
        return true;
}

/** Show previous news item */
void ShowLastNewsMessage()
{
        const NewsItem *ni = nullptr;
        if (_total_news == 0) {
                return;
        } else if (_forced_news == nullptr) {
                /* Not forced any news yet, show the current one, unless a news window is
                 * open (which can only be the current one), then show the previous item */
                if (_current_news == nullptr) {
                        /* No news were shown yet resp. the last shown one was already deleted.
                         * Threat this as if _forced_news reached _oldest_news; so, wrap around and start anew with the latest. */
                        ni = _latest_news;
                } else {
                        const Window *w = FindWindowById(WC_NEWS_WINDOW, 0);
                        ni = (w == nullptr || (_current_news == _oldest_news)) ? _current_news : _current_news->prev;
                }
        } else if (_forced_news == _oldest_news) {
                /* We have reached the oldest news, start anew with the latest */
                ni = _latest_news;
        } else {
                /* 'Scrolling' through news history show each one in turn */
                ni = _forced_news->prev;
        }
        bool wrap = false;
        for (;;) {
                if (_news_type_data[ni->type].GetDisplay() != ND_OFF) {
                        ShowNewsMessage(ni);
                        break;
                }

                ni = ni->prev;
                if (ni == nullptr) {
                        if (wrap) break;
                        /* We have reached the oldest news, start anew with the latest */
                        ni = _latest_news;
                        wrap = true;
                }
        }
}


/**
 * Draw an unformatted news message truncated to a maximum length. If
 * length exceeds maximum length it will be postfixed by '...'
 * @param left  the left most location for the string
 * @param right the right most location for the string
 * @param y position of the string
 * @param colour the colour the string will be shown in
 * @param *ni NewsItem being printed
 */
static void DrawNewsString(uint left, uint right, int y, TextColour colour, const NewsItem *ni)
{
        char buffer[512], buffer2[512];
        StringID str;

        CopyInDParam(0, ni->params, lengthof(ni->params));
        str = ni->string_id;

        GetString(buffer, str, lastof(buffer));
        /* Copy the just gotten string to another buffer to remove any formatting
         * from it such as big fonts, etc. */
        const char *ptr = buffer;
        char *dest = buffer2;
        WChar c_last = '\0';
        for (;;) {
                WChar c = Utf8Consume(&ptr);
                if (c == 0) break;
                /* Make a space from a newline, but ignore multiple newlines */
                if (c == '\n' && c_last != '\n') {
                        dest[0] = ' ';
                        dest++;
                } else if (c == '\r') {
                        dest[0] = dest[1] = dest[2] = dest[3] = ' ';
                        dest += 4;
                } else if (IsPrintable(c)) {
                        dest += Utf8Encode(dest, c);
                }
                c_last = c;
        }

        *dest = '\0';
        /* Truncate and show string; postfixed by '...' if necessary */
        DrawString(left, right, y, buffer2, colour);
}

struct MessageHistoryWindow : Window {
        static const int top_spacing;    ///< Additional spacing at the top of the #WID_MH_BACKGROUND widget.
        static const int bottom_spacing; ///< Additional spacing at the bottom of the #WID_MH_BACKGROUND widget.

        int line_height; /// < Height of a single line in the news history window including spacing.
        int date_width;  /// < Width needed for the date part.

        Scrollbar *vscroll;

        MessageHistoryWindow(WindowDesc *desc) : Window(desc)
        {
                this->CreateNestedTree();
                this->vscroll = this->GetScrollbar(WID_MH_SCROLLBAR);
                this->FinishInitNested(); // Initializes 'this->line_height' and 'this->date_width'.
                this->OnInvalidateData(0);
        }

        void UpdateWidgetSize(int widget, Dimension *size, const Dimension &padding, Dimension *fill, Dimension *resize) override
        {
                if (widget == WID_MH_BACKGROUND) {
                        this->line_height = FONT_HEIGHT_NORMAL + 2;
                        resize->height = this->line_height;

                        /* Months are off-by-one, so it's actually 8. Not using
                         * month 12 because the 1 is usually less wide. */
                        SetDParam(0, ConvertYMDToDate(ORIGINAL_MAX_YEAR, 7, 30));
                        this->date_width = GetStringBoundingBox(STR_SHORT_DATE).width;

                        size->height = 4 * resize->height + this->top_spacing + this->bottom_spacing; // At least 4 lines are visible.
                        size->width = std::max(200u, size->width); // At least 200 pixels wide.
                }
        }

        void OnPaint() override
        {
                this->OnInvalidateData(0);
                this->DrawWidgets();
        }

        void DrawWidget(const Rect &r, int widget) const override
        {
                if (widget != WID_MH_BACKGROUND || _total_news == 0) return;

                /* Find the first news item to display. */
                NewsItem *ni = _latest_news;
                for (int n = this->vscroll->GetPosition(); n > 0; n--) {
                        ni = ni->prev;
                        if (ni == nullptr) return;
                }

                /* Fill the widget with news items. */
                int y = r.top + this->top_spacing;
                bool rtl = _current_text_dir == TD_RTL;
                uint date_left  = rtl ? r.right - WD_FRAMERECT_RIGHT - this->date_width : r.left + WD_FRAMERECT_LEFT;
                uint date_right = rtl ? r.right - WD_FRAMERECT_RIGHT : r.left + WD_FRAMERECT_LEFT + this->date_width;
                uint news_left  = rtl ? r.left + WD_FRAMERECT_LEFT : r.left + WD_FRAMERECT_LEFT + this->date_width + WD_FRAMERECT_RIGHT + ScaleFontTrad(5);
                uint news_right = rtl ? r.right - WD_FRAMERECT_RIGHT - this->date_width - WD_FRAMERECT_RIGHT - ScaleFontTrad(5) : r.right - WD_FRAMERECT_RIGHT;
                for (int n = this->vscroll->GetCapacity(); n > 0; n--) {
                        SetDParam(0, ni->date);
                        DrawString(date_left, date_right, y, STR_SHORT_DATE);

                        DrawNewsString(news_left, news_right, y, TC_WHITE, ni);
                        y += this->line_height;

                        ni = ni->prev;
                        if (ni == nullptr) return;
                }
        }

        /**
         * 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.
         */
        void OnInvalidateData(int data = 0, bool gui_scope = true) override
        {
                if (!gui_scope) return;
                this->vscroll->SetCount(_total_news);
        }

        void OnClick(Point pt, int widget, int click_count) override
        {
                if (widget == WID_MH_BACKGROUND) {
                        NewsItem *ni = _latest_news;
                        if (ni == nullptr) return;

                        for (int n = this->vscroll->GetScrolledRowFromWidget(pt.y, this, WID_MH_BACKGROUND, WD_FRAMERECT_TOP); n > 0; n--) {
                                ni = ni->prev;
                                if (ni == nullptr) return;
                        }

                        ShowNewsMessage(ni);
                }
        }

        void OnResize() override
        {
                this->vscroll->SetCapacityFromWidget(this, WID_MH_BACKGROUND);
        }
};

const int MessageHistoryWindow::top_spacing = WD_FRAMERECT_TOP + 4;
const int MessageHistoryWindow::bottom_spacing = WD_FRAMERECT_BOTTOM;

static const NWidgetPart _nested_message_history[] = {
        NWidget(NWID_HORIZONTAL),
                NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
                NWidget(WWT_CAPTION, COLOUR_BROWN), SetDataTip(STR_MESSAGE_HISTORY, 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(WWT_PANEL, COLOUR_BROWN, WID_MH_BACKGROUND), SetMinimalSize(200, 125), SetDataTip(0x0, STR_MESSAGE_HISTORY_TOOLTIP), SetResize(1, 12), SetScrollbar(WID_MH_SCROLLBAR),
                EndContainer(),
                NWidget(NWID_VERTICAL),
                        NWidget(NWID_VSCROLLBAR, COLOUR_BROWN, WID_MH_SCROLLBAR),
                        NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
                EndContainer(),
        EndContainer(),
};

static WindowDesc _message_history_desc(
        WDP_AUTO, "list_news", 400, 140,
        WC_MESSAGE_HISTORY, WC_NONE,
        0,
        _nested_message_history, lengthof(_nested_message_history)
);

/** Display window with news messages history */
void ShowMessageHistory()
{
        CloseWindowById(WC_MESSAGE_HISTORY, 0);
        new MessageHistoryWindow(&_message_history_desc);
}