#include <Canvas\Canvas.mqh>

#property strict
#property indicator_separate_window
#property indicator_plots 0
#property version "3.00"
#property description "Unified CodeLock Dashboard + Tick Graphic"

#define INVALID_GRID (-2147483647)
#define CODELOCK_KEY_ESCAPE 0x1B
#define DASH_MIN_VISUAL_ROWS 5
#define DASH_VISUAL_ROW_STEP 10
#define DASH_VISUAL_LEVEL_MAX 2000
#define DASH_VISUAL_ROW_MAX 40
#define DASH_DASHBOARD_ROWS 40

// ============================================================================
// CODELOCK-DASHBOARD-TICKGRAPHIC
// ============================================================================

input double StartPrice=1;        // Начальная цена, от которой строится сетка уровней
input int BufferPoints=0;          // Единый BUFFER подтверждения CROSSING в points
input int HistoryChunkSize=5000;      // Размер блока исторических тиков для обработки
input int HistoryGraphTicks=700000;   // Количество исторических тиков для первоначального графика
input int HistoryBootstrapTicks=700000;  // Количество исторических тиков для восстановления состояния до запуска
input int MaxGraphSegments=2000000;    // Максимальное количество тиков графика; согласовано с лимитом расчётной истории
input int MaxModelHistoryTicks=2000000; // Максимальное количество тиков, доступных для полного пересчета модели
input bool DrawReversalArrows=true;   // Показывать последние REVERSAL: N UP + N DOWN на каждый LEVEL
input int ReversalArrowsHistory=20;   // Количество последних REVERSAL отдельно по направлению и LEVEL
input bool DrawRayObjects=true;         // Показывать ценовые лучи
input int PriceLabelsCount=3;           // Legacy input: currently unused; retained for saved parameter-set compatibility
input int InitialViewTicks=50000;       // Количество тиков в первоначальном масштабе
input int MinViewTicks=5;                 // Минимальное количество тиков при максимальном приближении
input int BidLabelOffset=8;               // Legacy input: currently unused; retained for saved parameter-set compatibility
// Вертикальный viewport фиксируется при первом построении: новые тики не сдвигают
// масштаб и исторические цены по вертикали. Цены вне диапазона не расширяют окно.
// Уровни динамически появляются/исчезают по текущему диапазону BID.
input bool EnableAlert=true;             // Разрешить экранные уведомления
input bool EnablePushNotification=true; // Разрешить Push-уведомления
input bool EnableEmailNotification=true; // Разрешить уведомления по Email
input bool EnableSoundNotification=true; // Разрешить звуковые уведомления
input string NotificationSound="alert.wav"; // Имя звукового файла уведомления
input color TickGraphColor=clrDodgerBlue; // Цвет тикового графика
input color RayColor=clrSilver;            // Цвет обычных лучей сетки
input color CurrentRayColor=clrGold;      // Цвет текущего уровня и Bid
input color UpCrossColor=clrGreen;    // Цвет стрелок пересечения вверх
input color DownCrossColor=clrRed;     // Цвет стрелок пересечения вниз
input color BuyColor=clrBlue;      // Legacy input: currently unused; retained for saved parameter-set compatibility
input color SellColor=clrRed;       // Legacy input: currently unused; retained for saved parameter-set compatibility

string Prefix="TPDR_";
string ShortName="CodeLock-Dashboard-TickGraphic";

// Forward declarations: MQL5 requires a declaration before an earlier call.
void DashFireLevelAlert(const int stateIndex,const int grid,const int direction);
void DashRenderDashboard(const double bid);
void HandleHorizontalZoom(const int xCursor,const int delta);

void NotifyEvent(const string eventName,const string directionName,const int level,const double price,const long timeMsc);
double GetModelTickByIndex(const int index);
void RecordReversalArrow(const double price,const bool buy,const int level=0);
int GetViewStartIndex();
int GetViewCount();
int GetGraphWidth();
void EnsurePanelLabel(const string name,const string textValue);
void RefreshGraph();
void DashSetAlertButtonState(const int index);
void SyncTickVisualRowsFromDashboard();
bool HistoryDerivedStateComplete();
bool RestoreChartEventSettings();

// Рабочее состояние количества уровней. Inputs задают начальное значение,
// а кнопки изменяют именно это состояние без изменения input-параметров.
double PreviousBid=0.0;
bool HavePreviousBid=false;
bool LiveMode=false;
bool BootstrapComplete=false;
int SubWindow=-1;


long AttachMsc=0;
long CursorMsc=1;
int CursorSameMsc=0;
int BootstrapAttempts=0;
int HistoryBootstrapTargetTicks=0;
uint BootstrapLastAttemptTick=0;
bool BootstrapRetryPending=false;
int BootstrapLastLoggedError=0;
uint BootstrapLastErrorLogTick=0;
const uint BootstrapRetryDelayMs=1000;
const uint BootstrapErrorLogIntervalMs=60000;

CCanvas TickCanvas;
bool CanvasReady=false;
int CanvasWidth=0;
int CanvasHeight=0;
int CanvasSubWindow=-1;
double ScaleMin=0.0;
double ScaleMax=0.0;
double GraphScaleMin=0.0;
double GraphScaleMax=0.0;
int ScaleCenterGrid=0;
double ViewportCenterPrice=0.0;
bool ScaleInitialized=false;

// Текущий LEVEL, определённый фактическим BID.
// Это состояние отображения LEVEL, а не центр вертикального viewport.
int CurrentLevelGrid=INVALID_GRID;
bool CurrentLevelGridInitialized=false;
int ViewSpan=0;
int ViewEndOffset=0;
bool DragActive=false;
int DragStartX=0;
int DragStartOffset=0;

// После ручного масштабирования AutoScale сохраняет выбранный диапазон.
bool VerticalScaleManual=false;
bool VerticalScaleDragActive=false;
bool VerticalPanDragActive=false;
bool PointerDragTracking=false;
int VerticalPanDragStartY=0;
double VerticalPanDragStartCenterPrice=0.0;
bool InitialArrowHistoryScalePending=false;
int VerticalScaleDragStartY=0;
double VerticalScaleDragStartHalfRange=0.0;
double VerticalScaleHalfRange=0.0;

const int VerticalScaleHandleWidth=18;
const double VerticalScaleDragSensitivity=0.008;

const int ZoomButtonWidth=36;
const int ResetButtonWidth=64;
const int ZoomButtonHeight=28;
const int ZoomButtonGap=6;
const int PriceScaleWidth=85;
const int GraphTopReserved=0;
const int GraphBottomReserved=0;
const double GraphBidSafeLower=0.22;
const double GraphBidSafeUpper=0.78;
const double GraphBidTargetLower=0.32;
const double GraphBidTargetUpper=0.68;
const int LevelButtonWidth=32;
const int LevelButtonHeight=22;
const int LevelButtonGap=3;
const int GraphLevelsPerSideMin=5;
const int GraphLevelsPerSideMax=DASH_VISUAL_LEVEL_MAX;
int GraphLevelsPerSide=10;
const int GraphDisplayedLevelCountMin=1;
const int GraphDisplayedLevelCountMax=100;
int GraphDisplayedLevelCount=5;
string GraphDisplayedLevelCountKey="";
string LastGraphLabelNames[];
int LastGraphLabelNameCount=0;
bool LegacyGraphLabelsCleaned=false;
const int ControlPanelTop=24;
const int DistanceButtonWidth=36;
const int DistanceButtonHeight=22;
const int DistanceButtonGap=3;
const int ControlPanelLabelWidth=52;
const int ControlPanelPadding=5;
const int ControlPanelRowGap=4;
const int ControlPanelHeight=520;
// Истинно после однократного расчёта первоначального вертикального диапазона.
bool AutoScaleInitialized=false;

bool ResetButtonHeld=false;
bool PreviousChartMouseScroll=true;
bool PreviousChartEventMouseMove=false;
bool PreviousChartEventMouseWheel=false;
bool ChartEventSettingsCaptured=false;
bool MouseScrollSetErrorLogged=false;
bool DashboardHasPublishedState=false;
bool LegacyPriceObjectsCleaned=false;
bool MouseInTickSubwindow=false;
bool InitialViewLayoutActive=false;

// Сохранённый снимок расчётного состояния используется после REASON_CHARTCHANGE.
// Он не является отдельным источником истины: кэш — сериализованная копия
// ModelTickPrices[] и производного состояния.

double TickPrices[];
int TickCount=0;
int GraphHistoryCapacity=2000000;
int TickHead=0;
long TickSerial=0;

// Единственный источник истины для пересчета модели.
// Графический хвост TickPrices[] является только представлением этой истории.
double ModelTickPrices[];
double ModelTickAsks[];
int ModelTickCount=0;
int ModelTickHead=0;

struct SignalMark
{
   long serial;
   double price;
   int level;       // LEVEL, на сетке которого подтверждён REVERSAL
   bool up;
   bool reversal;
};

SignalMark SignalMarks[];

// LEVEL — независимая сетка; отдельной модели DISTANCE нет.

struct TickLevelRow
{
   int level;
   int direction;
   int directionGrid;
   int lastCrossedGrid;
   int lastCrossingDirection;
   int consecutiveCrossings;
   double lastReversalPrice;
   double reversalAtPrice;
   double lastDown1Price;
   double lastDown2Price;
   double lastUp1Price;
   double lastUp2Price;
   double phaseMinBid;
   double phaseMaxAsk;
   bool alertEnabled;
};

TickLevelRow TickLevelRows[];
int TickLevelRowCount=0;
void ResetTickLevelRowState(TickLevelRow &row)
{
   row.direction=0;
   row.directionGrid=INVALID_GRID;
   row.lastCrossedGrid=INVALID_GRID;
   row.lastCrossingDirection=0;
   row.consecutiveCrossings=0;
   row.lastReversalPrice=0.0;
   row.reversalAtPrice=0.0;
   row.lastDown1Price=0.0;
   row.lastDown2Price=0.0;
   row.lastUp1Price=0.0;
   row.lastUp2Price=0.0;
   row.phaseMinBid=0.0;
   row.phaseMaxAsk=0.0;
   row.alertEnabled=false;
}







void ResetAllTickVisualRowStates()
{
   for(int i=0;i<TickLevelRowCount;i++)
      ResetTickLevelRowState(TickLevelRows[i]);
}

int FloorGridForStep(const double price,const double step)
{
   if(step<=0.0)
      return INVALID_GRID;

   double position=(NormalizeDouble(price,_Digits)-NormalizeDouble(StartPrice,_Digits))/step;
   return (int)MathFloor(position);
}

int CeilGridForStep(const double price,const double step)
{
   if(step<=0.0)
      return INVALID_GRID;

   double position=(NormalizeDouble(price,_Digits)-NormalizeDouble(StartPrice,_Digits))/step;
   return (int)MathCeil(position);
}

double RayPriceForStep(const int grid,const double step)
{
   if(step<=0.0)
      return 0.0;

   return NormalizeDouble(StartPrice+(double)grid*step,_Digits);
}

int TickRowGrid(const int rowIndex,const double price)
{
   if(rowIndex<0 || rowIndex>=TickLevelRowCount)
      return INVALID_GRID;

   double step=(double)TickLevelRows[rowIndex].level*_Point;
   return FloorGridForStep(price,step);
}

double TickRowPrice(const int rowIndex,const int grid)
{
   if(rowIndex<0 || rowIndex>=TickLevelRowCount)
      return 0.0;

   double step=(double)TickLevelRows[rowIndex].level*_Point;
   return RayPriceForStep(grid,step);
}

// REVERSAL AT — соседний уровень, обратное пересечение которого подтверждает REVERSAL.
void FinalizeTickRowsFromHistory()
{
   if(TickLevelRowCount<=0 || ModelTickCount<2)
      return;

   // Если история не содержит CROSSING, начальное направление берётся из последнего изменения BID.
   double lastBid=GetModelTickByIndex(ModelTickCount-1);
   double previousBid=GetModelTickByIndex(ModelTickCount-2);
   if(lastBid<=0.0 || previousBid<=0.0 || lastBid==previousBid)
      return;

   int fallbackDirection=(lastBid>previousBid ? 1 : -1);
   for(int i=0;i<TickLevelRowCount;i++)
   {
      if(TickLevelRows[i].direction!=0)
         continue;

      double step=(double)TickLevelRows[i].level*_Point;
      if(step<=0.0)
         continue;

      int direction=fallbackDirection;
      int grid=(direction>0 ? CeilGridForStep(lastBid,step) :
                              FloorGridForStep(lastBid,step));
      if(grid==INVALID_GRID)
         continue;

      TickLevelRows[i].direction=direction;
      TickLevelRows[i].directionGrid=grid;
      TickLevelRows[i].lastCrossedGrid=grid;
      TickLevelRows[i].lastCrossingDirection=direction;
      TickLevelRows[i].consecutiveCrossings=0;
      UpdateTickRowReversalAt(i);
   }
}

bool HistoryDerivedStateComplete()
{
   // Published Dashboard values must come from the calculated history model.
   // Do not publish temporary dash placeholders while history is still loading.
   if(TickLevelRowCount<=0 || ModelTickCount<2)
      return false;

   for(int i=0;i<TickLevelRowCount;i++)
   {
      if(TickLevelRows[i].direction==0 || TickLevelRows[i].reversalAtPrice<=0.0)
         return false;
      if(TickLevelRows[i].lastDown1Price<=0.0 || TickLevelRows[i].lastDown2Price<=0.0)
         return false;
      if(TickLevelRows[i].lastUp1Price<=0.0 || TickLevelRows[i].lastUp2Price<=0.0)
         return false;
   }

   return true;
}

void UpdateTickRowReversalAt(const int rowIndex)
{
   if(rowIndex<0 || rowIndex>=TickLevelRowCount)
      return;

   if(TickLevelRows[rowIndex].direction==0 || TickLevelRows[rowIndex].directionGrid==INVALID_GRID)
   {
      TickLevelRows[rowIndex].reversalAtPrice=0.0;
      return;
   }

   TickLevelRows[rowIndex].reversalAtPrice=TickRowPrice(rowIndex,
                                    TickLevelRows[rowIndex].directionGrid-TickLevelRows[rowIndex].direction);
}

bool RegisterTickRowCrossing(const int rowIndex,const int grid,
                              const int crossingDirection,const MqlTick &tick,
                              const bool emitSignals)
{
   if(rowIndex<0 || rowIndex>=TickLevelRowCount)
      return false;

   TickLevelRows[rowIndex].lastCrossedGrid=grid;
   TickLevelRows[rowIndex].lastCrossingDirection=crossingDirection;

   if(TickLevelRows[rowIndex].direction==0)
   {
      TickLevelRows[rowIndex].direction=crossingDirection;
      TickLevelRows[rowIndex].directionGrid=grid;
      TickLevelRows[rowIndex].consecutiveCrossings=1;
      UpdateTickRowReversalAt(rowIndex);

      if(crossingDirection<0)
         TickLevelRows[rowIndex].phaseMinBid=tick.bid;
      else if(tick.ask>0.0)
         TickLevelRows[rowIndex].phaseMaxAsk=tick.ask;
      return false;
   }

   if(crossingDirection==TickLevelRows[rowIndex].direction)
   {
      // CROSSING того же направления обновляет направление.
      // REVERSAL подтверждается только на соседнем grid в обратную сторону.
      TickLevelRows[rowIndex].directionGrid=grid;
      TickLevelRows[rowIndex].consecutiveCrossings++;
      UpdateTickRowReversalAt(rowIndex);
      return false;
   }

   int reversalGrid=TickLevelRows[rowIndex].directionGrid-TickLevelRows[rowIndex].direction;
   if(grid!=reversalGrid)
      return false;

   int oldDirection=TickLevelRows[rowIndex].direction;
   TickLevelRows[rowIndex].direction=crossingDirection;
   TickLevelRows[rowIndex].directionGrid=grid;
   TickLevelRows[rowIndex].consecutiveCrossings=1;
   TickLevelRows[rowIndex].lastReversalPrice=TickRowPrice(rowIndex,grid);
   UpdateTickRowReversalAt(rowIndex);

   if(crossingDirection<0)
   {
      TickLevelRows[rowIndex].lastDown2Price=TickLevelRows[rowIndex].lastDown1Price;
      TickLevelRows[rowIndex].lastDown1Price=TickLevelRows[rowIndex].lastReversalPrice;
   }
   else
   {
      TickLevelRows[rowIndex].lastUp2Price=TickLevelRows[rowIndex].lastUp1Price;
      TickLevelRows[rowIndex].lastUp1Price=TickLevelRows[rowIndex].lastReversalPrice;
   }

   if(oldDirection>0)
      TickLevelRows[rowIndex].phaseMaxAsk=0.0;
   else
      TickLevelRows[rowIndex].phaseMinBid=0.0;

   RecordReversalArrow(TickLevelRows[rowIndex].lastReversalPrice,
                       crossingDirection>0,TickLevelRows[rowIndex].level);
   return true;
}

void ProcessTickRow(const int rowIndex,const double oldBid,const double bid,
                    const MqlTick &tick,const bool emitSignals)
{
   if(rowIndex<0 || rowIndex>=TickLevelRowCount || bid==oldBid)
      return;

   double step=(double)TickLevelRows[rowIndex].level*_Point;
   if(step<=0.0)
      return;

   double buffer=(double)MathMax(0,BufferPoints)*_Point;

   if(bid>oldBid)
   {
      int first=FloorGridForStep(oldBid-buffer,step)-1;
      int last=FloorGridForStep(bid-buffer,step)+1;

      for(int grid=first;grid<=last;grid++)
      {
         double confirmationPrice=NormalizeDouble(
            RayPriceForStep(grid,step)+buffer,_Digits);

         if(confirmationPrice>oldBid && confirmationPrice<=bid)
         {
            bool reversal=RegisterTickRowCrossing(rowIndex,grid,1,tick,emitSignals);
            if(reversal && TickLevelRows[rowIndex].alertEnabled && emitSignals)
            {
               NotifyEvent("REVERSAL","UP",
                           TickLevelRows[rowIndex].level,
                           TickRowPrice(rowIndex,grid),tick.time_msc);
               DashFireLevelAlert(rowIndex,grid,1);
               TickLevelRows[rowIndex].alertEnabled=false;
            }
         }
      }
   }
   else
   {
      int first=CeilGridForStep(oldBid+buffer,step)+1;
      int last=CeilGridForStep(bid+buffer,step)-1;

      for(int grid=first;grid>=last;grid--)
      {
         double confirmationPrice=NormalizeDouble(
            RayPriceForStep(grid,step)-buffer,_Digits);

         if(confirmationPrice<oldBid && confirmationPrice>=bid)
         {
            bool reversal=RegisterTickRowCrossing(rowIndex,grid,-1,tick,emitSignals);
            if(reversal && TickLevelRows[rowIndex].alertEnabled && emitSignals)
            {
               NotifyEvent("REVERSAL","DOWN",
                           TickLevelRows[rowIndex].level,
                           TickRowPrice(rowIndex,grid),tick.time_msc);
               DashFireLevelAlert(rowIndex,grid,-1);
               TickLevelRows[rowIndex].alertEnabled=false;
            }
         }
      }
   }
}
void AppendModelTick(const double bid,const double ask)
{
   if(bid<=0.0 || MaxModelHistoryTicks<1)
      return;

   if(ArraySize(ModelTickPrices)<MaxModelHistoryTicks)
      ArrayResize(ModelTickPrices,MaxModelHistoryTicks,MaxModelHistoryTicks);
   if(ArraySize(ModelTickAsks)<MaxModelHistoryTicks)
      ArrayResize(ModelTickAsks,MaxModelHistoryTicks,MaxModelHistoryTicks);

   if(ModelTickCount<MaxModelHistoryTicks)
   {
      int index=(ModelTickHead+ModelTickCount)%MaxModelHistoryTicks;
      ModelTickPrices[index]=bid;
      ModelTickAsks[index]=(ask>0.0 ? ask : 0.0);
      ModelTickCount++;
   }
   else
   {
      ModelTickPrices[ModelTickHead]=bid;
      ModelTickAsks[ModelTickHead]=(ask>0.0 ? ask : 0.0);
      ModelTickHead=(ModelTickHead+1)%MaxModelHistoryTicks;
   }
}

double GetModelTickByIndex(const int index)
{
   if(index<0 || index>=ModelTickCount)
      return 0.0;

   return ModelTickPrices[(ModelTickHead+index)%MaxModelHistoryTicks];
}

double GetModelAskByIndex(const int index)
{
   if(index<0 || index>=ModelTickCount)
      return 0.0;

   return ModelTickAsks[(ModelTickHead+index)%MaxModelHistoryTicks];
}

void ResetSelectedCalculation()
{
   PreviousBid=0.0;
   HavePreviousBid=false;
}

void ClearDerivedState()
{
   TickCount=0;
   TickHead=0;
   TickSerial=0;
   ArrayResize(TickPrices,MathMax(100,GraphHistoryCapacity),
                MathMax(100,GraphHistoryCapacity));
   ArrayResize(SignalMarks,0);
   // Не сбрасывать viewport при пересборке расчётной истории:
   // он относится к отображению, а не к производной модели тиков.
   ResetSelectedCalculation();
   ResetAllTickVisualRowStates();
}


void ShiftRelativeWindowForCrossing(const int crossingGrid)
{
   // CROSSING не изменяет viewport. Визуальное окно меняется только
   // при достижении BID физического края ценового диапазона.
}
double GetViewportLevelStepPrice()
{
   double minimum=0.0;
   for(int i=0;i<TickLevelRowCount;i++)
   {
      double step=(double)TickLevelRows[i].level*_Point;
      if(step<=0.0) continue;
      if(minimum<=0.0 || step<minimum) minimum=step;
   }
   return minimum;
}
int FloorGridForViewport(const double price)
{
   double step=GetViewportLevelStepPrice();
   if(step<=0.0) return INVALID_GRID;
   double position=(NormalizeDouble(price,_Digits)-NormalizeDouble(StartPrice,_Digits))/step;
   return (int)MathFloor(position+1.0e-9);
}
int CeilGridForViewport(const double price)
{
   double step=GetViewportLevelStepPrice();
   if(step<=0.0) return INVALID_GRID;
   double position=(NormalizeDouble(price,_Digits)-NormalizeDouble(StartPrice,_Digits))/step;
   return (int)MathCeil(position-1.0e-9);
}
double ViewportRayPrice(const int grid)
{
   double step=GetViewportLevelStepPrice();
   if(step<=0.0) return 0.0;
   return NormalizeDouble(StartPrice+(double)grid*step,_Digits);
}

void DeleteObjectsByPrefix()
{
   ObjectsDeleteAll(0,Prefix,-1,-1);
}

void NotifyEvent(const string eventName,const string directionName,const int level,const double price,const long timeMsc)
{
   if(!LiveMode)
      return;

   string directionArrow=(directionName=="UP" ? "↑" : "↓");
   string msg=StringFormat("%s %s ···· Level: %d pt ···· Price Level: %s",
      directionArrow,_Symbol,level,DoubleToString(price,_Digits));

   Print(msg);

   if(EnableAlert)
      Alert(msg);

   if(EnableSoundNotification && StringLen(NotificationSound)>0)
      PlaySound(NotificationSound);

   if(EnablePushNotification)
   {
      ResetLastError();
      if(!SendNotification(msg))
         Print("TPDR SendNotification failed. Error=",GetLastError());
   }

   if(EnableEmailNotification)
   {
      ResetLastError();
      if(!SendMail("TPDR "+eventName+" "+directionName,msg))
         Print("TPDR SendMail failed. Error=",GetLastError());
   }
}

void AddTickToGraph(const double bid)
{
   if(bid<=0.0 || GraphHistoryCapacity<1)
      return;

   // TickPrices[] заранее резервируется целиком. На глубокой истории
   // нельзя делать ArrayResize() на каждом тике: это создаёт лишние
   // перераспределения памяти и заметно увеличивает стартовую загрузку.
   if(ArraySize(TickPrices)<GraphHistoryCapacity)
      ArrayResize(TickPrices,GraphHistoryCapacity,GraphHistoryCapacity);

   if(TickCount<GraphHistoryCapacity)
   {
      int index=(TickHead+TickCount)%GraphHistoryCapacity;
      TickPrices[index]=bid;
      TickCount++;
   }
   else
   {
      TickPrices[TickHead]=bid;
      TickHead=(TickHead+1)%GraphHistoryCapacity;
   }
}

double GetTickPriceByVisibleIndex(const int index)
{
   if(index<0 || index>=TickCount)
      return 0.0;

   int physical=(TickHead+index)%GraphHistoryCapacity;
   return TickPrices[physical];
}

void AddReversalSignalMark(const double price,const bool up,const int level)
{
   if(!DrawReversalArrows || ReversalArrowsHistory<=0 ||
      price<=0.0 || level<=0)
      return;

   int size=ArraySize(SignalMarks);
   ArrayResize(SignalMarks,size+1);
   SignalMarks[size].serial=TickSerial;
   SignalMarks[size].price=NormalizeDouble(price,_Digits);
   SignalMarks[size].level=level;
   SignalMarks[size].up=up;
   SignalMarks[size].reversal=true;

   // Keep the last N UP and N DOWN reversals independently for each LEVEL.
   // Otherwise activity on other dashboard levels can evict this level's arrows
   // before DrawSignalLayer() applies its selected-level filter.
   int keepCount=MathMin(20,MathMax(1,ReversalArrowsHistory));
   int count=0;
   for(int i=0;i<ArraySize(SignalMarks);i++)
      if(SignalMarks[i].reversal &&
         SignalMarks[i].up==up &&
         SignalMarks[i].level==level)
         count++;

   if(count<=keepCount)
      return;

   // SignalMarks are appended chronologically; remove the oldest matching
   // direction+LEVEL event, not the oldest event from another LEVEL.
   for(int i=0;i<ArraySize(SignalMarks);i++)
   {
      if(!SignalMarks[i].reversal ||
         SignalMarks[i].up!=up ||
         SignalMarks[i].level!=level)
         continue;

      for(int j=i;j<ArraySize(SignalMarks)-1;j++)
         SignalMarks[j]=SignalMarks[j+1];
      ArrayResize(SignalMarks,ArraySize(SignalMarks)-1);
      break;
   }
}

void RecordReversalArrow(const double price,const bool buy,const int level)
{
   // Стрелка фиксирует REVERSAL, но сама по себе не является ALERT.
   // Уведомления отправляются только при пересечении строки с активной кнопкой ALERT.
   AddReversalSignalMark(price,buy,level);
}


// VIEWPORT: масштаб и позиция окна отделены от состояния LEVEL. Новый тик не центрирует окно.
void UpdateCurrentLevelGrid(const double bid)
{
   if(bid<=0.0 || GetViewportLevelStepPrice()<=0.0)
      return;

   int grid=FloorGridForViewport(bid);
   if(grid==INVALID_GRID)
      return;

   CurrentLevelGrid=grid;
   CurrentLevelGridInitialized=true;
}

void UpdateSubwindowScale(const double bid)
{
   if(SubWindow<0 || bid<=0.0 || TickLevelRowCount<=0)
      return;

   UpdateCurrentLevelGrid(bid);

   int viewStart=GetViewStartIndex();
   int viewCount=GetViewCount();

   double visibleMin=bid;
   double visibleMax=bid;

   for(int i=0;i<viewCount;i++)
   {
      double price=GetTickPriceByVisibleIndex(viewStart+i);
      if(price<=0.0)
         continue;

      visibleMin=MathMin(visibleMin,price);
      visibleMax=MathMax(visibleMax,price);
   }

   if(InitialArrowHistoryScalePending)
   {
      for(int i=0;i<ArraySize(SignalMarks);i++)
      {
         if(!SignalMarks[i].reversal ||
            SignalMarks[i].level!=GraphLevelsPerSide)
            continue;
         visibleMin=MathMin(visibleMin,SignalMarks[i].price);
         visibleMax=MathMax(visibleMax,SignalMarks[i].price);
      }
   }

   // Центр первоначального окна определяется историческим диапазоном,
   // а не текущим BID. Последующие тики не меняют центр viewport.
   if(!ScaleInitialized)
   {
      double historyCenter=(visibleMin+visibleMax)*0.5;
      ViewportCenterPrice=NormalizeDouble(historyCenter,_Digits);
      ScaleCenterGrid=FloorGridForViewport(ViewportCenterPrice);
      ScaleInitialized=true;
   }

   double minimumStep=GetGraphLevelStepPrice();
   minimumStep=MathMax(minimumStep,_Point);

   int graphLevel=GraphLevelsPerSide;
   int graphPerSide=MathMax(1,GraphDisplayedLevelCount);
   for(int side=-1;side<=1;side+=2)
   {
      double levelPrice=GetGraphLevelSidePriceByOffset(bid,graphLevel,side,graphPerSide);
      if(levelPrice<=0.0)
         continue;

      visibleMin=MathMin(visibleMin,levelPrice);
      visibleMax=MathMax(visibleMax,levelPrice);
   }

   double viewportCenter=(ViewportCenterPrice>0.0 ?
                          ViewportCenterPrice : bid);
   double autoHalfRange=MathMax(MathAbs(viewportCenter-visibleMin),
                                MathAbs(visibleMax-viewportCenter));
   double minimumHalfRange=minimumStep*3.0;
   autoHalfRange=MathMax(autoHalfRange,minimumHalfRange);

   double autoPadding=MathMax(autoHalfRange*0.05,minimumStep*0.10);
   autoHalfRange+=autoPadding;

   // Автомасштаб разрешён только при первом построении (или явном RESET).
   // Изменение BID и числа отображаемых уровней не меняет масштаб истории.
   if(!VerticalScaleManual && !AutoScaleInitialized)
   {
      VerticalScaleHalfRange=autoHalfRange;
      AutoScaleInitialized=true;
   }

   double scaleHalfRange=MathMax(VerticalScaleHalfRange,
                                 minimumStep*0.20);

   // Автосдвиг viewport включается только когда BID подходит к краю.
   // Цена остаётся не в центре: вверх — в верхней трети окна,
   // вниз — в нижней трети. Масштаб не меняется, двигается только окно.
   if(!VerticalScaleManual && ScaleInitialized && AutoScaleInitialized &&
      scaleHalfRange>minimumStep)
   {
      double bidOffset=bid-viewportCenter;
      double followTrigger=scaleHalfRange*0.60;
      double followTarget=scaleHalfRange*0.35;

      if(bidOffset>followTrigger)
         viewportCenter=bid-followTarget;
      else if(bidOffset < -followTrigger)
         viewportCenter=bid+followTarget;

      viewportCenter=NormalizeDouble(viewportCenter,_Digits);
      ViewportCenterPrice=viewportCenter;
      ScaleCenterGrid=FloorGridForViewport(ViewportCenterPrice);
   }

   GraphScaleMin=NormalizeDouble(viewportCenter-scaleHalfRange,_Digits);
   GraphScaleMax=NormalizeDouble(viewportCenter+scaleHalfRange,_Digits);

   if(GraphScaleMax<=GraphScaleMin)
   {
      GraphScaleMin=viewportCenter-minimumStep;
      GraphScaleMax=viewportCenter+minimumStep;
   }

   // Viewport moves only after BID crosses the follow threshold.


   ScaleMin=GraphScaleMin;
   ScaleMax=GraphScaleMax;

   IndicatorSetDouble(INDICATOR_MINIMUM,GraphScaleMin);
   IndicatorSetDouble(INDICATOR_MAXIMUM,GraphScaleMax);
   IndicatorSetInteger(INDICATOR_FIXED_MINIMUM,true);
   IndicatorSetInteger(INDICATOR_FIXED_MAXIMUM,true);

   if(CanvasReady)
      CanvasHeight=(int)ChartGetInteger(0,CHART_HEIGHT_IN_PIXELS,SubWindow);
}


int GetViewStartIndex()
{
   if(TickCount<=0)
      return 0;

   int span=ViewSpan;
   if(span<=0)
      span=TickCount;

   span=MathMax(1,MathMin(span,TickCount));

   int maxOffset=MathMax(0,TickCount-span);
   int offset=MathMax(0,MathMin(ViewEndOffset,maxOffset));

   return TickCount-span-offset;
}

int GetViewCount()
{
   if(TickCount<=0)
      return 0;

   int span=ViewSpan;
   if(span<=0)
      span=TickCount;

   return MathMax(1,MathMin(span,TickCount));
}

// ViewSpan настраивается при bootstrap или смене диапазона, а не при каждом рендере.
void FitInitialArrowHistory()
{
   if(TickCount<=0)
      return;

   const int targetPerDirection=MathMin(20,MathMax(1,ReversalArrowsHistory));
   long firstGraphSerial=MathMax(1,TickSerial-TickCount+1);
   long oldestSerial=-1;
   long newestSerial=-1;

   for(int direction=0;direction<2;direction++)
   {
      long cutoff=9223372036854775807;
      for(int n=0;n<targetPerDirection;n++)
      {
         long best=-1;
         for(int k=0;k<ArraySize(SignalMarks);k++)
         {
            if(!SignalMarks[k].reversal ||
               SignalMarks[k].level!=GraphLevelsPerSide)
               continue;
            bool wanted=(direction==1 ? SignalMarks[k].up : !SignalMarks[k].up);
            if(!wanted)
               continue;

            long serial=SignalMarks[k].serial;
            if(serial<firstGraphSerial || serial>TickSerial || serial>=cutoff)
               continue;

            if(serial>best)
               best=serial;
         }

         if(best<0)
            break;

         oldestSerial=(oldestSerial<0 ? best : MathMin(oldestSerial,best));
         newestSerial=(newestSerial<0 ? best : MathMax(newestSerial,best));
         cutoff=best;
      }
   }

   if(oldestSerial<0 || newestSerial<0)
   {
      ViewSpan=MathMin(MathMax(InitialViewTicks,MinViewTicks),TickCount);
      ViewEndOffset=0;
      InitialViewLayoutActive=true;
      return;
   }

   long spanLong=newestSerial-oldestSerial+1;
   int requiredSpan=(int)MathMin((long)TickCount,spanLong);
   requiredSpan=MathMax(MinViewTicks,requiredSpan);
   requiredSpan=MathMin(requiredSpan,TickCount);

   ViewSpan=requiredSpan;
   ViewEndOffset=0;
   InitialViewLayoutActive=true;
}


// Validate the retained arrow limit independently for each LEVEL and direction.
void ValidateReversalArrowHistory()
{
   if(ReversalArrowsHistory<=0)
      return;

   int keepCount=MathMin(20,MathMax(1,ReversalArrowsHistory));
   for(int row=0;row<TickLevelRowCount;row++)
   {
      int level=TickLevelRows[row].level;
      for(int direction=0;direction<2;direction++)
      {
         bool wantedUp=(direction==1);
         int count=0;
         for(int i=0;i<ArraySize(SignalMarks);i++)
            if(SignalMarks[i].reversal &&
               SignalMarks[i].up==wantedUp &&
               SignalMarks[i].level==level)
               count++;

         if(count>keepCount)
            Print("TPDR: reversal arrow history invariant violated. Level=",
                  level," Direction=",(wantedUp ? "UP" : "DOWN"),
                  " Count=",count," Limit=",keepCount);
      }
   }
}

int GraphPriceToY(const double price)
{
   if(CanvasHeight<=1 || GraphScaleMax<=GraphScaleMin)
      return CanvasHeight/2;

   int top=0;
   int bottom=MathMax(0,CanvasHeight-1);
   int drawableHeight=MathMax(1,bottom-top);

   double ratio=(GraphScaleMax-price)/(GraphScaleMax-GraphScaleMin);
   ratio=MathMax(0.0,MathMin(1.0,ratio));

   return top+(int)MathRound(ratio*(double)drawableHeight);
}

int PriceToY(const double price)
{
   return GraphPriceToY(price);
}

bool IsGraphPriceVisible(const double price)
{
   // Уровни больше не являются clipping-маской. Функция означает только
   // принадлежность цены текущему AutoScale viewport.
   return GraphScaleMax>GraphScaleMin &&
          price>=GraphScaleMin &&
          price<=GraphScaleMax;
}

void DrawDottedHorizontal(const int y,const uint clr)
{
   if(!CanvasReady || CanvasWidth<=0)
      return;

   int graphWidth=GetGraphWidth();
   for(int x=0;x<graphWidth;x+=8)
   {
      int x2=MathMin(x+4,graphWidth-1);
      TickCanvas.Line(x,y,x2,y,clr);
   }
}

void EnsureLevelPriceLabel(const string name,const int x,const int y,
                           const color clr,const string textValue)
{
   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_LABEL,SubWindow,0,0))
      {
         Print("TPDR: level price label creation error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_ANCHOR,ANCHOR_LEFT_UPPER);
      ObjectSetString(0,name,OBJPROP_FONT,"Arial");
      ObjectSetInteger(0,name,OBJPROP_FONTSIZE,9);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,20);
   }

   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,x);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,name,OBJPROP_COLOR,clr);
   ObjectSetString(0,name,OBJPROP_TEXT,textValue);
}

double GetGraphLevelStepPrice()
{
   return (GraphLevelsPerSide>=GraphLevelsPerSideMin ?
           (double)GraphLevelsPerSide*_Point : 0.0);
}

double GetGraphLevelSidePrice(const double bid,const int graphLevel,const int side)
{
   if(bid<=0.0 || graphLevel<=0 || (side!=1 && side!=-1))
      return 0.0;

   double step=(double)graphLevel*_Point;
   if(step<=0.0)
      return 0.0;

   double normalizedBid=NormalizeDouble(bid,_Digits);
   double position=(normalizedBid-NormalizeDouble(StartPrice,_Digits))/step;
   int grid=(side>0 ? (int)MathCeil(position-1.0e-9) :
                         (int)MathFloor(position+1.0e-9));
   double gridPrice=NormalizeDouble(StartPrice+(double)grid*step,_Digits);

   // UP must be strictly above BID and DOWN strictly below BID after rounding.
   while(side>0 && gridPrice<=normalizedBid)
   {
      grid++;
      gridPrice=NormalizeDouble(StartPrice+(double)grid*step,_Digits);
   }
   while(side<0 && gridPrice>=normalizedBid)
   {
      grid--;
      gridPrice=NormalizeDouble(StartPrice+(double)grid*step,_Digits);
   }

   return gridPrice;
}

double GetGraphLevelSidePriceByOffset(const double bid,const int graphLevel,
                                      const int side,const int offset)
{
   if(bid<=0.0 || graphLevel<=0 || (side!=1 && side!=-1) || offset<1)
      return 0.0;
   double step=(double)graphLevel*_Point;
   if(step<=0.0)
      return 0.0;

   double normalizedBid=NormalizeDouble(bid,_Digits);
   double position=(normalizedBid-NormalizeDouble(StartPrice,_Digits))/step;
   int baseGrid=(side>0 ? (int)MathCeil(position-1.0e-9) :
                             (int)MathFloor(position+1.0e-9));
   double basePrice=NormalizeDouble(StartPrice+(double)baseGrid*step,_Digits);

   // Keep the nearest grid level visible when BID lands exactly on it.
   // At equality the level belongs to the DOWN side; UP remains strictly above.
   while(side>0 && basePrice<=normalizedBid)
   {
      baseGrid++;
      basePrice=NormalizeDouble(StartPrice+(double)baseGrid*step,_Digits);
   }
   while(side<0 && basePrice>normalizedBid)
   {
      baseGrid--;
      basePrice=NormalizeDouble(StartPrice+(double)baseGrid*step,_Digits);
   }

   int grid=baseGrid+(side>0 ? (offset-1) : -(offset-1));
   return NormalizeDouble(StartPrice+(double)grid*step,_Digits);
}

int GetGraphRuntimeRowIndex(const int graphLevel)
{
   if(graphLevel<=0)
      return -1;

   for(int i=0;i<TickLevelRowCount;i++)
   {
      if(TickLevelRows[i].level==graphLevel)
         return i;
   }

   return -1;
}

void DrawRayLayer(const double bid)
{
   if(!CanvasReady || !DrawRayObjects || GraphScaleMax<=GraphScaleMin || TickLevelRowCount<=0 || bid<=0.0)
      return;
   if(GetGraphLevelStepPrice()<=0.0)
      return;
   int perSide=MathMax(1,GraphDisplayedLevelCount);
   int graphLevel=GraphLevelsPerSide;
   for(int offset=1;offset<=perSide;offset++)
      for(int side=-1;side<=1;side+=2)
      {
         double price=GetGraphLevelSidePriceByOffset(bid,graphLevel,side,offset);
         if(price>0.0 && IsGraphPriceVisible(price))
            DrawDottedHorizontal(GraphPriceToY(price),ColorToARGB(RayColor,185));
      }
   // The full-width central BID line is intentionally removed.

}

int GetGraphWidth()
{
   // Canvas занимает только левую область тикового графика.
   // Правая область полностью резервируется под цены и не рисуется Canvas-ом.
   return MathMax(1,CanvasWidth);
}

void EnsureLevelRowsControlButton(const string name,const string textValue)
{
   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_BUTTON,SubWindow,0,0))
      {
         Print("TPDR: LEVEL rows button creation error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_XSIZE,LevelButtonWidth);
      ObjectSetInteger(0,name,OBJPROP_YSIZE,LevelButtonHeight);
      ObjectSetString(0,name,OBJPROP_TEXT,textValue);
      ObjectSetString(0,name,OBJPROP_FONT,"Arial");
      ObjectSetInteger(0,name,OBJPROP_FONTSIZE,10);
      ObjectSetInteger(0,name,OBJPROP_COLOR,clrWhite);
      ObjectSetInteger(0,name,OBJPROP_BGCOLOR,clrDimGray);
      ObjectSetInteger(0,name,OBJPROP_BORDER_COLOR,clrGray);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,1100);
   }
}

void UpdateLevelRowsControlsLayout()
{
   ObjectDelete(0,Prefix+"GRAPH_ROWS_LABEL");
   ObjectDelete(0,Prefix+"GRAPH_ROWS_MINUS");
   ObjectDelete(0,Prefix+"GRAPH_ROWS_VALUE");
   ObjectDelete(0,Prefix+"GRAPH_ROWS_PLUS");
}


string GetGraphDisplayedLevelCountKey()
{
   if(GraphDisplayedLevelCountKey=="")
      GraphDisplayedLevelCountKey="TPDR_GL_"+IntegerToString(ChartID())+"_"+_Symbol;
   return GraphDisplayedLevelCountKey;
}

void SaveGraphDisplayedLevelCount()
{
   GlobalVariableSet(GetGraphDisplayedLevelCountKey(),(double)GraphDisplayedLevelCount);
}

void LoadGraphDisplayedLevelCount()
{
   string key=GetGraphDisplayedLevelCountKey();
   if(GlobalVariableCheck(key))
      GraphDisplayedLevelCount=(int)MathRound(GlobalVariableGet(key));

   GraphDisplayedLevelCount=MathMax(GraphDisplayedLevelCountMin,
                                    MathMin(GraphDisplayedLevelCountMax,
                                            GraphDisplayedLevelCount));
   SaveGraphDisplayedLevelCount();
}

void HandleLevelRowsButtonClick(const string name)
{
   // GRAPHIC LEVELS controls belong to the Dashboard namespace (DashPrefix),
   // not the TickGraph object namespace (Prefix).
   if(name==DashPrefix+"GRAPH_ROWS_MINUS")
   {
      GraphDisplayedLevelCount=MathMax(GraphDisplayedLevelCountMin,GraphDisplayedLevelCount-1);
      SaveGraphDisplayedLevelCount();
      ResetGraphToCurrentPrice();
      RefreshGraph();
      return;
   }
   if(name==DashPrefix+"GRAPH_ROWS_PLUS")
   {
      GraphDisplayedLevelCount=MathMin(GraphDisplayedLevelCountMax,GraphDisplayedLevelCount+1);
      SaveGraphDisplayedLevelCount();
      ResetGraphToCurrentPrice();
      RefreshGraph();
      return;
   }
}


void DrawGraphLevelLabels(const double bid)
{
   if(!CanvasReady || TickLevelRowCount<=0 || bid<=0.0)
      return;
   ObjectDelete(0,Prefix+"GRAPH_TITLE");
   EnsurePriceScaleArea();
   UpdateLevelRowsControlsLayout();

   int graphLevel=GraphLevelsPerSide;
   int perSide=MathMax(1,GraphDisplayedLevelCount);
   color priceLabelColor=clrSilver;
   double step=(double)graphLevel*_Point;
   if(step<=0.0)
      return;

   // Remove legacy names once. Current labels are keyed by absolute grid index,
   // not UP/DOWN + offset, so crossing a grid does not recreate the same label.
   if(!LegacyGraphLabelsCleaned)
   {
      ObjectsDeleteAll(0,Prefix+"GRAPH_LEVEL_",-1,-1);
      LegacyGraphLabelsCleaned=true;
      LastGraphLabelNameCount=0;
      ArrayResize(LastGraphLabelNames,0);
   }

   string currentNames[];
   ArrayResize(currentNames,perSide*2);
   int currentNameCount=0;

   for(int offset=1;offset<=perSide;offset++)
      for(int side=-1;side<=1;side+=2)
      {
         double price=GetGraphLevelSidePriceByOffset(bid,graphLevel,side,offset);
         if(price<=0.0 || !IsGraphPriceVisible(price))
            continue;

         int grid=(int)MathRound((price-NormalizeDouble(StartPrice,_Digits))/step);
         string name=Prefix+"GRAPH_LEVEL_"+IntegerToString(graphLevel)+"_"+
                     IntegerToString(grid);

         // Keep one object identity for the same absolute LEVEL grid price.
         EnsurePanelLabel(name,DoubleToString(price,_Digits));
         int desiredY=GraphPriceToY(price)-7;
         int labelTop=0;
         int labelBottom=MathMax(labelTop,CanvasHeight-2);
         desiredY=MathMax(labelTop,MathMin(labelBottom,desiredY));

         ObjectSetInteger(0,name,OBJPROP_XDISTANCE,CanvasWidth+8);
         ObjectSetInteger(0,name,OBJPROP_YDISTANCE,desiredY);
         ObjectSetInteger(0,name,OBJPROP_FONTSIZE,8);
         ObjectSetInteger(0,name,OBJPROP_COLOR,priceLabelColor);
         ObjectSetInteger(0,name,OBJPROP_ZORDER,1000);

         bool duplicate=false;
         for(int j=0;j<currentNameCount;j++)
            if(currentNames[j]==name)
            {
               duplicate=true;
               break;
            }
         if(!duplicate && currentNameCount<ArraySize(currentNames))
            currentNames[currentNameCount++]=name;
      }

   // Delete only labels that left the current visible set.
   for(int i=0;i<LastGraphLabelNameCount;i++)
   {
      bool retained=false;
      for(int j=0;j<currentNameCount;j++)
         if(LastGraphLabelNames[i]==currentNames[j])
         {
            retained=true;
            break;
         }
      if(!retained)
         ObjectDelete(0,LastGraphLabelNames[i]);
   }

   ArrayResize(LastGraphLabelNames,currentNameCount);
   for(int i=0;i<currentNameCount;i++)
      LastGraphLabelNames[i]=currentNames[i];
   LastGraphLabelNameCount=currentNameCount;
}

void DrawTickLayer(const double currentBid)
{
   if(!CanvasReady || TickCount<=0 || currentBid<=0.0)
      return;

   int viewStart=GetViewStartIndex();
   int viewCount=GetViewCount();
   if(viewCount<=0)
      return;

   uint graphColor=ColorToARGB(TickGraphColor,255);
   int graphWidth=GetGraphWidth();
   int leftMargin=0;
   int rightMargin=0;
   int drawWidth=MathMax(1,graphWidth);

   if(viewCount==1)
   {
      int y=GraphPriceToY(currentBid);
      int x=leftMargin;
      TickCanvas.LineThick(x,y,MathMin(graphWidth-1,x+4),y,graphColor,2,STYLE_SOLID,LINE_END_ROUND);
      return;
   }

   bool havePrevious=false;
   int previousX=0;
   int previousY=0;

   for(int i=0;i<viewCount;i++)
   {
      int x=leftMargin+(int)MathRound((double)i*(double)(drawWidth-1)/(double)(viewCount-1));
      double price=GetTickPriceByVisibleIndex(viewStart+i);

      // Последняя точка всегда является фактическим текущим Bid.
      if(i==viewCount-1)
         price=currentBid;

      if(!IsGraphPriceVisible(price))
      {
         havePrevious=false;
         continue;
      }

      int y=GraphPriceToY(price);

      if(havePrevious)
         TickCanvas.LineThick(previousX,previousY,x,y,graphColor,2,STYLE_SOLID,LINE_END_ROUND);

      previousX=x;
      previousY=y;
      havePrevious=true;
   }
}

void DrawArrowMark(const int x,const int y,const bool up,const bool reversal,const color clr)
{
   if(!CanvasReady)
      return;

   uint c=ColorToARGB(clr,255);
   int size=reversal ? 7 : 5;

   // (x,y) — точка события, то есть ОСТРИЁ стрелки.
   // Геометрия стрелки строится относительно этой точки и больше
   // не добавляет скрытого смещения по цене.
   if(up)
   {
      TickCanvas.FillTriangle(x,y,x-size,y+2*size,x+size,y+2*size,c);
   }
   else
   {
      TickCanvas.FillTriangle(x,y,x-size,y-2*size,x+size,y-2*size,c);
   }
}

void DrawBidMarker(const double bid)
{
   if(!CanvasReady || bid<=0.0)
      return;

   int y=GraphPriceToY(bid);
   uint c=ColorToARGB(CurrentRayColor,255);

   int graphWidth=GetGraphWidth();
   int rightX=MathMax(0,graphWidth-1);
   int markerWidth=MathMin(4,graphWidth);
   int markerStart=MathMax(0,rightX-markerWidth+1);
   TickCanvas.Line(markerStart,y,rightX,y,c);
   TickCanvas.FillTriangle(MathMax(2,rightX-12),y-5,
                           MathMax(2,rightX-2),y,
                           MathMax(2,rightX-12),y+5,c);
}

void DrawCurrentTickMarker(const double currentBid)
{
   if(!CanvasReady || currentBid<=0.0)
      return;

   int graphWidth=GetGraphWidth();
   int x=MathMax(0,graphWidth-1);
   int y=GraphPriceToY(currentBid);

   TickCanvas.FillCircle(x,y,3,ColorToARGB(TickGraphColor,255));
}

void DrawSignalLayer(const double bid)
{
   if(!CanvasReady || TickCount<=0 || ArraySize(SignalMarks)==0 || bid<=0.0)
      return;

   long firstSerial=TickSerial-TickCount+1;
   int viewStart=GetViewStartIndex();
   int viewCount=GetViewCount();
   int viewEnd=viewStart+viewCount-1;
   if(!DrawReversalArrows)
      return;

   // На графике отображаются именно REVERSAL, а не обычные CROSSING.
   // Храним последние N UP + N DOWN отдельно для каждого LEVEL.
   // Цена стрелки абсолютная и не пересчитывается от текущего BID.

   for(int i=0;i<ArraySize(SignalMarks);i++)
   {
      if(!SignalMarks[i].reversal)
         continue;

      // Графический REVERSAL относится только к выбранному GRAPHIC LEVEL.
      // Стрелки разворотов других dashboard LEVEL не являются событиями
      // выбранного тикового графика и не должны отображаться на нём.
      if(SignalMarks[i].level!=GraphLevelsPerSide)
         continue;

      long serial=SignalMarks[i].serial;
      if(serial<firstSerial || serial>TickSerial)
         continue;
      int index=(int)(serial-firstSerial);
      if(index<viewStart || index>viewEnd)
         continue;

      int relative=index-viewStart;
      int drawWidth=MathMax(1,GetGraphWidth());
      int x=(viewCount==1) ? 0 :
         (int)MathRound((double)relative*(double)(drawWidth-1)/(double)(viewCount-1));
      double signalPrice=SignalMarks[i].price;
      if(!IsGraphPriceVisible(signalPrice))
         continue;

      int y=GraphPriceToY(signalPrice);
      color clr=(SignalMarks[i].up ? UpCrossColor : DownCrossColor);
      DrawArrowMark(x,y,SignalMarks[i].up,true,clr);
   }
}

void DeleteLegacyPriceObjects()
{
   if(LegacyPriceObjectsCleaned)
      return;

   // Однократная миграционная очистка. Старые объекты больше не создаются,
   // поэтому удалять их на каждом тике не имеет смысла и создаёт лишнюю
   // нагрузку на графический поток.
   for(int i=0;i<200;i++)
      ObjectDelete(0,Prefix+"PRICE_DYNAMIC_"+IntegerToString(i));

   for(int i=0;i<50;i++)
   {
      ObjectDelete(0,Prefix+"DIST_UP_"+IntegerToString(i));
      ObjectDelete(0,Prefix+"DIST_DOWN_"+IntegerToString(i));
   }

   ObjectDelete(0,Prefix+"PRICE_BID");
   ObjectDelete(0,Prefix+"CURRENT_DIRECTION_ARROW");

   LegacyPriceObjectsCleaned=true;
}

void DeleteLegacyStatePanel()
{
   string names[16]=
   {
      Prefix+"STATE_TITLE",
      Prefix+"STATE_LEVEL_LABEL",Prefix+"STATE_LEVEL_VALUE",
      Prefix+"STATE_DIRECTION_LABEL",Prefix+"STATE_DIRECTION_VALUE",
      Prefix+"STATE_REVERSAL_AT_LABEL",Prefix+"STATE_REVERSAL_AT_VALUE",
      Prefix+"STATE_LAST_DOWN_2",Prefix+"STATE_LAST_DOWN_2_VALUE",
      Prefix+"STATE_LAST_DOWN_1",Prefix+"STATE_LAST_DOWN_1_VALUE",
      Prefix+"STATE_LAST_UP_2",Prefix+"STATE_LAST_UP_2_VALUE",
      Prefix+"STATE_LAST_UP_1",Prefix+"STATE_LAST_UP_1_VALUE"
   };
   for(int i=0;i<ArraySize(names);i++)
      if(ObjectFind(0,names[i])>=0)
         ObjectDelete(0,names[i]);
}

bool EnsureCanvas()
{
   if(SubWindow<0)
      return false;

   // A resized/reordered indicator window may receive a new subwindow index.
   // Recreate the bitmap in the current window instead of leaving it attached
   // to the old one.
   if(CanvasReady && CanvasSubWindow!=SubWindow)
   {
      TickCanvas.Destroy();
      CanvasReady=false;
      CanvasWidth=0;
      CanvasHeight=0;
      CanvasSubWindow=-1;
   }

   int chartWidth=(int)ChartGetInteger(0,CHART_WIDTH_IN_PIXELS,0);
   int chartHeight=(int)ChartGetInteger(0,CHART_HEIGHT_IN_PIXELS,SubWindow);

   // Правая часть под цены физически не входит в Canvas, поэтому
   // тиковая линия не может накладываться на ценовые подписи.
   int wantedWidth=MathMax(50,chartWidth-PriceScaleWidth);

   if(wantedWidth<50 || chartHeight<20)
      return false;

   // Canvas всегда занимает ровно всё окно TickGraph по вертикали:
   // верхняя граница = 0, нижняя граница = chartHeight-1.
   // Мышь не должна иметь возможности физически сдвинуть график за эти границы.
   if(CanvasReady)
   {
      ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_XDISTANCE,0);
      ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_YDISTANCE,0);
      ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_XSIZE,wantedWidth);
      ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_YSIZE,chartHeight);
   }

   if(CanvasReady && CanvasWidth==wantedWidth && CanvasHeight==chartHeight)
      return true;

   if(CanvasReady)
   {
      ResetLastError();
      if(!TickCanvas.Resize(wantedWidth,chartHeight))
      {
         int resizeError=GetLastError();
         Print("TPDR: canvas resize failed; recreating bitmap. Error=",resizeError);
         TickCanvas.Destroy();
         CanvasReady=false;
         CanvasWidth=0;
         CanvasHeight=0;
         CanvasSubWindow=-1;
         ObjectDelete(0,Prefix+"PANEL");
      }
      else
      {
         CanvasWidth=wantedWidth;
         CanvasHeight=chartHeight;
         return true;
      }
   }

   ResetLastError();

   if(!TickCanvas.CreateBitmapLabel(0,SubWindow,Prefix+"PANEL",0,0,
                                    wantedWidth,chartHeight,
                                    COLOR_FORMAT_ARGB_NORMALIZE))
   {
      Print("TPDR: canvas creation failed. Error=",GetLastError());
      return false;
   }

   CanvasWidth=wantedWidth;
   CanvasHeight=chartHeight;
   CanvasSubWindow=SubWindow;
   CanvasReady=true;

   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_CORNER,CORNER_LEFT_UPPER);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_XDISTANCE,0);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_YDISTANCE,0);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_XSIZE,wantedWidth);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_YSIZE,chartHeight);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_BACK,true);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_SELECTABLE,false);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_SELECTED,false);
   ObjectSetInteger(0,Prefix+"PANEL",OBJPROP_HIDDEN,true);

   return true;
}

bool IsPointInsideObject(const string name,const int x,const int y)
{
   if(ObjectFind(0,name)<0 || SubWindow<0)
      return false;

   int bx=(int)ObjectGetInteger(0,name,OBJPROP_XDISTANCE);
   int by=(int)ObjectGetInteger(0,name,OBJPROP_YDISTANCE);
   int bw=(int)ObjectGetInteger(0,name,OBJPROP_XSIZE);
   int bh=(int)ObjectGetInteger(0,name,OBJPROP_YSIZE);
   ENUM_BASE_CORNER corner=(ENUM_BASE_CORNER)ObjectGetInteger(
      0,name,OBJPROP_CORNER);

   // CHARTEVENT_MOUSE_MOVE передаёт Y относительно главного окна,
   // графические объекты подокна — относительно самого подокна.
   int subwindowTop=(int)ChartGetInteger(0,CHART_WINDOW_YDISTANCE,SubWindow);
   int localY=y-subwindowTop;
   int localX=x;

   int top=by;
   int left=bx;

   if(corner==CORNER_LEFT_LOWER)
      top=CanvasHeight-by-bh;
   else if(corner==CORNER_RIGHT_UPPER ||
           corner==CORNER_RIGHT_LOWER)
      left=CanvasWidth-bx-bw;

   if(corner==CORNER_RIGHT_LOWER)
      top=CanvasHeight-by-bh;

   return localX>=left && localX<left+bw &&
          localY>=top && localY<top+bh;
}

void EnsureResetButton(const string name,const string textValue)
{
   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_BUTTON,SubWindow,0,0))
      {
         Print("TPDR: reset button creation error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_LOWER);
      ObjectSetInteger(0,name,OBJPROP_XSIZE,ResetButtonWidth);
      ObjectSetInteger(0,name,OBJPROP_YSIZE,ZoomButtonHeight);
      ObjectSetString(0,name,OBJPROP_TEXT,textValue);
      ObjectSetString(0,name,OBJPROP_FONT,"Arial");
      ObjectSetInteger(0,name,OBJPROP_FONTSIZE,10);
      ObjectSetInteger(0,name,OBJPROP_COLOR,clrWhite);
      ObjectSetInteger(0,name,OBJPROP_BGCOLOR,clrDimGray);
      ObjectSetInteger(0,name,OBJPROP_BORDER_COLOR,clrGray);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
      ObjectSetInteger(0,name,OBJPROP_STATE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,1000);
   }
}

void EnsureZoomButton(const string name,const string textValue)
{
   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_BUTTON,SubWindow,0,0))
      {
         Print("TPDR: zoom button creation error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_LOWER);
      ObjectSetInteger(0,name,OBJPROP_XSIZE,ZoomButtonWidth);
      ObjectSetInteger(0,name,OBJPROP_YSIZE,ZoomButtonHeight);
      ObjectSetString(0,name,OBJPROP_TEXT,textValue);
      ObjectSetString(0,name,OBJPROP_FONT,"Arial");
      ObjectSetInteger(0,name,OBJPROP_FONTSIZE,12);
      ObjectSetInteger(0,name,OBJPROP_COLOR,clrWhite);
      ObjectSetInteger(0,name,OBJPROP_BGCOLOR,clrDimGray);
      ObjectSetInteger(0,name,OBJPROP_BORDER_COLOR,clrGray);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
      ObjectSetInteger(0,name,OBJPROP_STATE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,120);
   }
}





void EnsurePanelLabel(const string name,const string textValue)
{
   // GRAPH labels belong to the TickGraphic indicator subwindow.
   // Recreate legacy labels that were created in the main chart window.
   // ObjectFind() returns the subwindow index for an existing object.
   // OBJPROP_WINDOW does not exist in MQL5 object properties.
   if(ObjectFind(0,name)>=0 && ObjectFind(0,name)!=SubWindow)
      ObjectDelete(0,name);

   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_LABEL,SubWindow,0,0))
      {
         Print("TPDR: panel label creation error=",GetLastError(),
               " Name=",name," SubWindow=",SubWindow);
         return;
      }
      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetString(0,name,OBJPROP_FONT,"Arial");
      ObjectSetInteger(0,name,OBJPROP_FONTSIZE,9);
      ObjectSetInteger(0,name,OBJPROP_COLOR,clrWhite);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,500);
   }

   ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
   ObjectSetString(0,name,OBJPROP_TEXT,textValue);
}





void EnsureZoomControlBackground(const int x,const int y,const int totalWidth)
{
   string name=Prefix+"ZOOM_CONTROL_BG";

   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_RECTANGLE_LABEL,SubWindow,0,0))
         return;

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_LOWER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,80);
      ObjectSetInteger(0,name,OBJPROP_BORDER_TYPE,BORDER_FLAT);
   }

   // Фон также принудительно привязываем к нижнему левому углу.
   // Иначе старый объект мог остаться с прежним CORNER.
   ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_LOWER);
   ObjectSetInteger(0,name,OBJPROP_BACK,false);
   ObjectSetInteger(0,name,OBJPROP_ZORDER,80);

   int padding=5;
   int panelX=MathMax(0,x-padding);
   int panelY=MathMax(0,y-padding);
   int panelWidth=MathMin(CanvasWidth-panelX,totalWidth+2*padding);

   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,panelX);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,panelY);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,MathMax(1,panelWidth));
   ObjectSetInteger(0,name,OBJPROP_YSIZE,ZoomButtonHeight+2*padding);
   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,clrBlack);
   ObjectSetInteger(0,name,OBJPROP_COLOR,clrDimGray);
}

void EnsureGraphHeaderBackground()
{
   if(SubWindow<0 || CanvasWidth<=0 || CanvasHeight<=0)
      return;

   string name=Prefix+"GRAPH_HEADER_BG";

   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_RECTANGLE_LABEL,SubWindow,0,0))
      {
         Print("TPDR: graph header background creation error=",GetLastError());
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
      ObjectSetInteger(0,name,OBJPROP_BORDER_TYPE,BORDER_FLAT);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,40);
   }

   color background=(color)ChartGetInteger(0,CHART_COLOR_BACKGROUND,0);
   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,0);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,0);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,CanvasWidth);
   ObjectSetInteger(0,name,OBJPROP_YSIZE,
                    MathMin(GraphTopReserved,CanvasHeight));
   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,background);
   ObjectSetInteger(0,name,OBJPROP_COLOR,background);
}

void UpdateZoomButtonsLayout()
{
   if(SubWindow<0 || CanvasWidth<=0 || CanvasHeight<=0)
      return;

   EnsureGraphHeaderBackground();

   string minusName=Prefix+"ZOOM_MINUS";
   string plusName=Prefix+"ZOOM_PLUS";
   string resetName=Prefix+"RESET_CURRENT";
   string labelName=Prefix+"ZOOM_LABEL";

   // Старый отдельный фон больше не используется: кнопки входят
   // непосредственно в общую таблицу LEVELS/Distance.
   string oldBackground=Prefix+"ZOOM_CONTROL_BG";
   if(ObjectFind(0,oldBackground)>=0)
      ObjectDelete(0,oldBackground);
   EnsureZoomButton(minusName,"-");
   EnsureZoomButton(plusName,"+");
   EnsureResetButton(resetName,"RESET");
   EnsurePanelLabel(labelName,"ZOOM");

   // Верхняя строка зарезервирована под название индикатора/графика.
   // Кнопки управления опускаем ниже, чтобы они не перекрывали заголовок.
   int y=34;
   int controlsWidth=2*ZoomButtonWidth+ResetButtonWidth+2*ZoomButtonGap;
   int x=MathMax(4,CanvasWidth-controlsWidth-8);

   int x1=x;
   int x2=x+ZoomButtonWidth+ZoomButtonGap;
   int x3=x+2*(ZoomButtonWidth+ZoomButtonGap);

   ObjectSetInteger(0,minusName,OBJPROP_CORNER,CORNER_LEFT_UPPER);
   ObjectSetInteger(0,minusName,OBJPROP_XSIZE,ZoomButtonWidth);
   ObjectSetInteger(0,minusName,OBJPROP_YSIZE,ZoomButtonHeight);
   ObjectSetInteger(0,minusName,OBJPROP_BACK,false);
   ObjectSetInteger(0,minusName,OBJPROP_ZORDER,1000);
   ObjectSetInteger(0,minusName,OBJPROP_XDISTANCE,x1);
   ObjectSetInteger(0,minusName,OBJPROP_YDISTANCE,y);

   ObjectSetInteger(0,plusName,OBJPROP_CORNER,CORNER_LEFT_UPPER);
   ObjectSetInteger(0,plusName,OBJPROP_XSIZE,ZoomButtonWidth);
   ObjectSetInteger(0,plusName,OBJPROP_YSIZE,ZoomButtonHeight);
   ObjectSetInteger(0,plusName,OBJPROP_BACK,false);
   ObjectSetInteger(0,plusName,OBJPROP_ZORDER,1000);
   ObjectSetInteger(0,plusName,OBJPROP_XDISTANCE,x2);
   ObjectSetInteger(0,plusName,OBJPROP_YDISTANCE,y);

   ObjectSetInteger(0,resetName,OBJPROP_CORNER,CORNER_LEFT_UPPER);
   ObjectSetInteger(0,resetName,OBJPROP_XSIZE,ResetButtonWidth);
   ObjectSetInteger(0,resetName,OBJPROP_YSIZE,ZoomButtonHeight);
   ObjectSetInteger(0,resetName,OBJPROP_BACK,false);
   ObjectSetInteger(0,resetName,OBJPROP_ZORDER,1000);
   ObjectSetInteger(0,resetName,OBJPROP_XDISTANCE,x3);
   ObjectSetInteger(0,resetName,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,resetName,OBJPROP_STATE,ResetButtonHeld);

   ObjectSetInteger(0,labelName,OBJPROP_CORNER,CORNER_LEFT_UPPER);
   ObjectSetInteger(0,labelName,OBJPROP_ZORDER,1000);
   ObjectSetInteger(0,labelName,OBJPROP_XDISTANCE,MathMax(4,x-48));
   ObjectSetInteger(0,labelName,OBJPROP_YDISTANCE,y+4);
}

void ResetGraphToCurrentPrice()
{
   if(TickCount<=0)
      return;

   // RESET возвращает только начальный VIEW, стараясь показать последние
   // REVERSAL-стрелки по правилам FitInitialArrowHistory() и текущий BID.
   // История, LEVEL и runtime-модель RESET не изменяет.
   ViewSpan=MathMin(MathMax(InitialViewTicks,MinViewTicks),TickCount);
   ViewEndOffset=0;
   InitialViewLayoutActive=true;
   FitInitialArrowHistory();

   VerticalScaleManual=false;
   VerticalScaleDragActive=false;
   VerticalPanDragActive=false;
   VerticalScaleHalfRange=0.0;

   AutoScaleInitialized=false;
   InitialArrowHistoryScalePending=true;

   MqlTick current;
   if(SymbolInfoTick(_Symbol,current) && current.bid>0.0 && GetViewportLevelStepPrice()>0.0)
   {
      double bid=NormalizeDouble(current.bid,_Digits);
      ScaleCenterGrid=FloorGridForViewport(bid);
      ViewportCenterPrice=ViewportRayPrice(ScaleCenterGrid);
      ScaleInitialized=true;
      UpdateCurrentLevelGrid(bid);
   }

   ResetButtonHeld=false;
}

void ApplyZoomButton(const int delta)
{
   if(TickCount<=1 || GetGraphWidth()<=1)
      return;

   InitialViewLayoutActive=false;

   HandleHorizontalZoom(GetGraphWidth()/2,delta);
   RefreshGraph();
}

void HandleZoomButtonClick(const string name)
{
   if(name==Prefix+"ZOOM_MINUS")
   {
      InitialViewLayoutActive=false;
      ApplyZoomButton(-1);
      return;
   }

   if(name==Prefix+"ZOOM_PLUS")
   {
      InitialViewLayoutActive=false;
      ApplyZoomButton(1);
      return;
   }

   if(name==Prefix+"RESET_CURRENT")
   {
      ResetGraphToCurrentPrice();
      ResetButtonHeld=false;
      RefreshGraph();
   }
}

void EnsurePriceScaleArea()
{
   if(SubWindow<0 || CanvasWidth<=0 || CanvasHeight<=0)
      return;

   string name=Prefix+"PRICE_SCALE_AREA";
   int chartWidth=(int)ChartGetInteger(0,CHART_WIDTH_IN_PIXELS,0);
   int priceAreaWidth=MathMax(0,chartWidth-CanvasWidth);

   if(priceAreaWidth<=0)
   {
      if(ObjectFind(0,name)>=0)
         ObjectSetInteger(0,name,OBJPROP_XSIZE,0);
      return;
   }

   if(ObjectFind(0,name)<0)
   {
      if(!ObjectCreate(0,name,OBJ_RECTANGLE_LABEL,SubWindow,0,0))
      {
         Print("TPDR: price scale area creation error=",GetLastError());
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_BACK,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,1);
   }

   color background=(color)ChartGetInteger(0,CHART_COLOR_BACKGROUND,0);
   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,CanvasWidth);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,0);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,priceAreaWidth);
   ObjectSetInteger(0,name,OBJPROP_YSIZE,CanvasHeight);
   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,background);
   ObjectSetInteger(0,name,OBJPROP_COLOR,background);
   ObjectSetInteger(0,name,OBJPROP_BORDER_TYPE,BORDER_FLAT);
}

void RenderGraph(const double bid)
{
   // Один источник текущего визуального LEVEL для всех render-слоёв.
   UpdateCurrentLevelGrid(bid);

   // До завершения bootstrap отображение запрещено. Это единый инвариант
   // для OnTimer(), OnCalculate(), RefreshGraph() и обработчиков кнопок.
   if(!BootstrapComplete)
      return;

   if(!EnsureCanvas())
      return;

   color background=(color)ChartGetInteger(0,CHART_COLOR_BACKGROUND,0);

   TickCanvas.Erase(ColorToARGB(background,255));

   DrawRayLayer(bid);
   DrawGraphLevelLabels(bid);
   DrawTickLayer(bid);
   DrawSignalLayer(bid);
   DrawBidMarker(bid);
   DrawCurrentTickMarker(bid);

   TickCanvas.Update(true);
   ObjectDelete(0,Prefix+"GRAPH_ROWS_LABEL");
   ObjectDelete(0,Prefix+"GRAPH_ROWS_MINUS");
   ObjectDelete(0,Prefix+"GRAPH_ROWS_VALUE");
   ObjectDelete(0,Prefix+"GRAPH_ROWS_PLUS");
   UpdateZoomButtonsLayout();
   DeleteLegacyStatePanel();
}

void RefreshGraph()
{
   if(SubWindow<0 || !BootstrapComplete)
      return;

   MqlTick current;
   if(!SymbolInfoTick(_Symbol,current) || current.bid<=0.0)
      return;

   // После wheel/drag обновляется горизонтальный viewport и перерисовывается
   // график. Вертикальный диапазон остаётся фиксированным; его можно изменить
   // вручную или явной командой RESET. Сам ViewSpan при этом НЕ изменяется.
   if(!EnsureCanvas())
      return;
   UpdateSubwindowScale(current.bid);
   RenderGraph(current.bid);
   InitialArrowHistoryScalePending=false;
   ChartRedraw(0);
}

void UpdateTickRowPhaseExtremes(const MqlTick &tick)
{
   if(tick.bid<=0.0)
      return;

   for(int row=0;row<TickLevelRowCount;row++)
   {
      if(TickLevelRows[row].direction>0 && tick.ask>0.0)
      {
         if(TickLevelRows[row].phaseMaxAsk<=0.0 || tick.ask>TickLevelRows[row].phaseMaxAsk)
            TickLevelRows[row].phaseMaxAsk=tick.ask;
      }
      else if(TickLevelRows[row].direction<0)
      {
         if(TickLevelRows[row].phaseMinBid<=0.0 || tick.bid<TickLevelRows[row].phaseMinBid)
            TickLevelRows[row].phaseMinBid=tick.bid;
      }
   }
}

void ProcessBidTick(const MqlTick &tick,const bool emitSignals,
                    const bool drawGraph,const bool storeHistory)
{
   if(tick.bid<=0.0)
      return;

   double bid=NormalizeDouble(tick.bid,_Digits);

   if(storeHistory)
      AppendModelTick(bid,tick.ask);

   TickSerial++;

   if(!HavePreviousBid)
   {
      PreviousBid=bid;
      HavePreviousBid=true;

      if(drawGraph)
         AddTickToGraph(bid);

      if(!ScaleInitialized)
      {
         ScaleCenterGrid=FloorGridForViewport(bid);
         ScaleInitialized=true;
      }

      UpdateTickRowPhaseExtremes(tick);
      return;
   }

   double oldBid=PreviousBid;

   if(drawGraph)
      AddTickToGraph(bid);

   if(bid!=oldBid)
   {
      for(int row=0;row<TickLevelRowCount;row++)
         ProcessTickRow(row,oldBid,bid,tick,emitSignals);

      PreviousBid=bid;
   }

   UpdateTickRowPhaseExtremes(tick);
}

void UpdateCursorFromArray(const MqlTick &ticks[],const int copied,const int startIndex)
{
   if(copied<=0)
      return;

   long finalMsc=ticks[copied-1].time_msc;

   // CopyTicks() работает включительно: запрос от CursorMsc может вернуть
   // уже обработанные тики с той же миллисекундой. Поэтому храним точное количество
   // обработанных тиков внутри последней временной отметки.
   if(finalMsc==CursorMsc)
   {
      int processedAtFinal=0;
      for(int i=0;i<copied;i++)
      {
         if(ticks[i].time_msc==finalMsc && i>=startIndex)
            processedAtFinal++;
      }

      if(processedAtFinal>0)
         CursorSameMsc+=processedAtFinal;
   }
   else
   {
      CursorMsc=finalMsc;

      int finalCount=0;
      for(int i=copied-1;i>=0 && ticks[i].time_msc==finalMsc;i--)
         finalCount++;

      CursorSameMsc=finalCount;
   }
}

bool BootstrapShouldLogError(const int error)
{
   uint now=GetTickCount();
   if(error!=BootstrapLastLoggedError ||
      (uint)(now-BootstrapLastErrorLogTick)>=BootstrapErrorLogIntervalMs)
   {
      BootstrapLastLoggedError=error;
      BootstrapLastErrorLogTick=now;
      return true;
   }
   return false;
}

bool BootstrapHistory()
{
   uint now=GetTickCount();
   if(BootstrapRetryPending &&
      (uint)(now-BootstrapLastAttemptTick)<BootstrapRetryDelayMs)
      return false;

   BootstrapRetryPending=false;
   BootstrapLastAttemptTick=now;

   int minimumTarget=MathMax(HistoryGraphTicks,HistoryBootstrapTicks);
   minimumTarget=MathMax(minimumTarget,100);
   int maximumTarget=MathMax(minimumTarget,MathMax(100,MaxModelHistoryTicks));

   if(HistoryBootstrapTargetTicks<=0)
      HistoryBootstrapTargetTicks=MathMin(minimumTarget,maximumTarget);
   else
      HistoryBootstrapTargetTicks=MathMax(minimumTarget,
                                           MathMin(HistoryBootstrapTargetTicks,maximumTarget));

   int targetTicks=HistoryBootstrapTargetTicks;
   MqlTick ticks[];
   ArrayResize(ticks,targetTicks);

   int copied=-1;
   int lastError=0;

   for(int attempt=0;attempt<3;attempt++)
   {
      ResetLastError();
      copied=CopyTicks(_Symbol,ticks,COPY_TICKS_INFO,0,(uint)targetTicks);
      lastError=GetLastError();

      if(copied<0)
      {
         if(lastError==4004)
         {
            targetTicks=MathMax(100,targetTicks/2);
            ArrayResize(ticks,targetTicks);
            continue;
         }

         if(lastError==4401 || lastError==4403)
         {
            BootstrapAttempts++;
            BootstrapRetryPending=true;
            if(BootstrapShouldLogError(lastError))
               Print("TPDR: tick history synchronization did not complete. Error=",
                     lastError," Attempts=",BootstrapAttempts,
                     " RetryDelayMs=",BootstrapRetryDelayMs);
            return false;
         }

         BootstrapRetryPending=true;
         if(BootstrapShouldLogError(lastError))
            Print("TPDR: bootstrap CopyTicks failed. Error=",lastError,
                  " Attempts=",BootstrapAttempts+1);
         BootstrapAttempts++;
         return false;
      }
      break;
   }

   if(copied<=0)
   {
      BootstrapAttempts++;
      BootstrapRetryPending=true;
      return false;
   }

   int lastAttach=-1;
   for(int i=0;i<copied;i++)
      if(ticks[i].time_msc<=AttachMsc)
         lastAttach=i;

   if(lastAttach<0)
   {
      if(targetTicks<maximumTarget)
      {
         HistoryBootstrapTargetTicks=MathMin(maximumTarget,
                                             MathMax(targetTicks+1,targetTicks*2));
         BootstrapRetryPending=true;
         return false;
      }

      BootstrapAttempts++;
      BootstrapRetryPending=true;
      if(BootstrapShouldLogError(lastError))
         Print("TPDR: no tick at or before attach time. AttachMsc=",AttachMsc,
               " Requested=",targetTicks," Copied=",copied,
               " Maximum=",maximumTarget);
      return false;
   }

   ArrayResize(ModelTickPrices,MathMax(100,MaxModelHistoryTicks),MathMax(100,MaxModelHistoryTicks));
   ModelTickCount=0;
   ModelTickHead=0;
   ClearDerivedState();

   // HISTORY and LIVE use the same ProcessBidTick() state machine.
   for(int i=0;i<=lastAttach;i++)
   {
      if(ticks[i].bid>0.0)
         ProcessBidTick(ticks[i],false,true,true);
   }

   int attachCount=0;
   for(int i=lastAttach;i>=0 && ticks[i].time_msc==AttachMsc;i--)
      attachCount++;

   CursorMsc=AttachMsc;
   CursorSameMsc=attachCount;
   FinalizeTickRowsFromHistory();

   // Do not accept a partial bootstrap as the requested history volume.
   // Increase the request and rebuild the model from the chronological tick stream.
   // At the configured maximum, continue only with the available broker history.
   if(copied<targetTicks && targetTicks<maximumTarget)
   {
      HistoryBootstrapTargetTicks=MathMin(maximumTarget,
                                          MathMax(targetTicks+1,targetTicks*2));
      BootstrapComplete=false;
      LiveMode=false;
      BootstrapRetryPending=true;
      Print("TPDR: tick history is partial. Requested=",targetTicks,
            " Copied=",copied," Next=",HistoryBootstrapTargetTicks,
            " Maximum=",maximumTarget," Error=",lastError);
      return false;
   }

   // Large LEVEL values require deeper history to obtain real REVERSAL,
   // LAST-DOWN and LAST-UP values. Expand the request and recalculate from the
   // beginning; if the configured limit is reached, report missing history.
   bool derivedStateComplete=HistoryDerivedStateComplete();
   if(!derivedStateComplete && targetTicks<maximumTarget)
   {
      HistoryBootstrapTargetTicks=MathMin(maximumTarget,
                                          MathMax(targetTicks+1,targetTicks*2));
      BootstrapComplete=false;
      LiveMode=false;
      BootstrapRetryPending=true;
      Print("TPDR: expanding tick history for missing LAST values. Requested=",
            targetTicks," Next=",HistoryBootstrapTargetTicks,
            " Maximum=",maximumTarget);
      return false;
   }

   if(!derivedStateComplete)
   {
      int incompleteRows=0;
      for(int row=0;row<TickLevelRowCount;row++)
      {
         if(TickLevelRows[row].direction==0 ||
            TickLevelRows[row].reversalAtPrice<=0.0 ||
            TickLevelRows[row].lastDown1Price<=0.0 ||
            TickLevelRows[row].lastDown2Price<=0.0 ||
            TickLevelRows[row].lastUp1Price<=0.0 ||
            TickLevelRows[row].lastUp2Price<=0.0)
            incompleteRows++;
      }

      string oldestTickText=(copied>0 ?
         TimeToString(ticks[0].time,TIME_DATE|TIME_SECONDS) : "UNKNOWN");
      Print("TPDR WARNING: required reversal history incomplete. Requested=",targetTicks,
            " Copied=",copied," ModelTicks=",ModelTickCount,
            " OldestTick=",oldestTickText,
            " MissingRows=",incompleteRows,
            " MaxHistoryTicks=",maximumTarget,
            ". The broker may not provide older ticks, or required REVERSAL events may not exist in available history.");
   }

   BootstrapAttempts=0;
   BootstrapRetryPending=false;
   BootstrapLastLoggedError=0;
   BootstrapComplete=true;
   LiveMode=true;

   ViewSpan=MathMin(MathMax(InitialViewTicks,MinViewTicks),MathMax(1,TickCount));
   ViewEndOffset=0;

   // REVERSAL arrows are produced by the same chronological history pass.
   FitInitialArrowHistory();
   ValidateReversalArrowHistory();
   InitialArrowHistoryScalePending=true;

   return true;
}

bool ProcessLiveTicks()
{
   MqlTick ticks[5000];
   int requestCount=MathMin(MathMax(HistoryChunkSize,100),5000);

   for(int chunk=0;chunk<20;chunk++)
   {
      int copied=-1;
      int requestTried=requestCount;
      int lastError=0;

      for(int attempt=0;attempt<3;attempt++)
      {
         ResetLastError();
         copied=CopyTicks(_Symbol,ticks,COPY_TICKS_INFO,
                          (ulong)MathMax(1,CursorMsc),(uint)requestTried);
         lastError=GetLastError();

         if(copied>=0)
            break;

         if(lastError!=4004)
         {
            Print("TPDR: live CopyTicks failed. Requested=",requestTried,
                  " CursorMsc=",CursorMsc," Error=",lastError);
            return false;
         }

         requestTried=MathMax(100,requestTried/2);
      }

      if(copied<0)
      {
         Print("TPDR: live CopyTicks retries exhausted. Requested=",requestTried,
               " CursorMsc=",CursorMsc," Error=",lastError);
         return false;
      }

      if(copied==0)
         return true;

      int start=0;
      if(ticks[0].time_msc==CursorMsc)
         start=MathMin(CursorSameMsc,copied);

      int processed=copied-start;
      for(int i=start;i<copied;i++)
         ProcessBidTick(ticks[i],true,true,true);

      UpdateCursorFromArray(ticks,copied,start);

      if(copied<requestTried || processed==0)
         return true;
   }

   return true;
}



// DASHBOARD отображает TickLevelRows[]; отдельной расчётной модели у GUI нет.
// Таблица: LEVEL, DIRECTION, REVERSAL AT, ALERT, GRAPHIC и LAST.


#define DASH_INVALID_GRID (-2147483647)
// Единый контракт LEVEL: каждая строка задаёт собственную ценовую сетку.
// Допускается любое целое значение LEVEL от 1 до DASH_VISUAL_LEVEL_MAX.
#define DASH_DEFAULT_VISUAL_ROWS "5,10,20,30,40,50"
#define DASH_PANEL_PREFIX "TPDRD_"
#define DASH_ROWS_STATE_PREFIX "TPDR_VISUAL_"
#define DASH_KEY_ESCAPE 27
input string InitialVisualRows=DASH_DEFAULT_VISUAL_ROWS; // Начальные Visual ROWS при первом запуске; рабочие ROWS сохраняются отдельно
input int UpdateIntervalMs=50;               // Быстрое обновление dashboard
input int PanelLeftMargin=12;                // Отступ слева
input int PanelTopMargin=12;                 // Отступ сверху
input int RowHeight=25;                      // Высота строки
input int HeaderHeight=72;                   // Высота заголовка
input int DashboardFontSize=11;              // Единый размер шрифта всей таблицы, включая заголовки, цифры и кнопки
input color AlertOnColor=clrOrange;          // Цвет включенного ALERT, ожидающего следующего пересечения
input color AlertOffColor=C'55,62,74';       // Цвет выключенного ALERT
input color AlertActivityColor=clrLimeGreen;  // Цвет краткой индикации фактического срабатывания ALERT
input int AlertActivityMs=500;               // Длительность индикации фактического срабатывания ALERT в миллисекундах
input color AlertTextColor=clrWhite;         // Цвет текста кнопки ALERT
input color PanelBackground=C'16,20,28';     // Фон панели
input color RowBackground=C'29,35,46';       // Фон строки
input color RowBackgroundAlt=C'24,30,40';    // Чередующийся фон
input color BorderColor=C'75,88,108';        // Граница
input color HeaderColor=clrDeepSkyBlue;      // Акцент заголовка
input color TextColor=clrWhiteSmoke;         // Основной текст
input color MutedTextColor=C'155,165,180';   // Вторичный текст
input color UpColor=clrLimeGreen;            // UP
input color DownColor=clrTomato;             // DOWN
input color WaitColor=clrSilver;             // WAIT

struct DashVisualRow
{
   int level;
};

// TickLevelRows[] уже объявлен как динамический массив выше и является единым runtime-состоянием.
DashVisualRow DashVisualRows[DASH_DASHBOARD_ROWS];
int DashVisualRowCount=0;
bool DashAlertEnabled[DASH_DASHBOARD_ROWS];
ulong DashAlertActivityUntil[DASH_DASHBOARD_ROWS];

string DashPrefix=DASH_PANEL_PREFIX;
string DashShortName="CodeLock Dashboard";
string DashRowsStateKey="";
bool DashVisualRowsLoaded=false;

int DashColLevelX=12;
int DashColStatusX=0;
int DashColTriggerX=0;
int DashColAlertX=0;
int DashColGraphicX=0;
int DashAutoPanelWidth=0;
int DashLevelButtonWidth=72;
int DashRowsButtonWidth=27;
int DashRowsValueWidth=48;
int DashEditingRow=-1;

int DashMeasureTextWidth(const string text)
{
   uint width=0;
   uint height=0;
   TextSetFont("Segoe UI",-DashboardFontSize*10,FW_NORMAL);
   if(!TextGetSize(text,width,height))
      return MathMax(1,StringLen(text)*DashboardFontSize);
   return (int)width;
}

void DashCalculateAutoLayout(const double bid)
{
   int levelWidth=DashMeasureTextWidth("LEVEL");
   int statusWidth=DashMeasureTextWidth("DIRECTION");
   int triggerWidth=DashMeasureTextWidth("REVERSAL AT");
   int alertWidth=DashMeasureTextWidth("ALERT")+16;
   int graphicWidth=DashMeasureTextWidth("GRAPHIC")+16;
   levelWidth=MathMax(levelWidth,DashMeasureTextWidth("100000 pt"));

   int gap=5;
   DashColLevelX=12;
   DashLevelButtonWidth=MathMax(66,levelWidth+12);
   DashColStatusX=DashColLevelX+DashLevelButtonWidth+gap;
   DashColTriggerX=DashColStatusX+statusWidth+gap;
   DashColAlertX=DashColTriggerX+triggerWidth+gap;
   DashColGraphicX=DashColAlertX+alertWidth+gap;
   DashAutoPanelWidth=DashColGraphicX+graphicWidth+24;
}

int DashGetLevelCount()
{
   return DashVisualRowCount;
}

int DashGetLevel(const int index)
{
   if(index<0 || index>=DashVisualRowCount) return 0;
   return DashVisualRows[index].level;
}

bool DashIsValidVisualLevel(const int level)
{
   // LEVEL задаётся пользователем целым числом points без обязательного шага 10.
   return level>=1 && level<=DASH_VISUAL_LEVEL_MAX;
}

bool DashIsStrictVisualRows()
{
   if(DashVisualRowCount<DASH_MIN_VISUAL_ROWS || DashVisualRowCount>DASH_DASHBOARD_ROWS) return false;
   for(int i=0;i<DashVisualRowCount;i++)
   {
      if(!DashIsValidVisualLevel(DashVisualRows[i].level)) return false;
      if(i>0 && DashVisualRows[i].level<=DashVisualRows[i-1].level) return false;
   }
   return true;
}

bool DashParseVisualRows(const string source)
{
   string parts[];
   int count=StringSplit(source,',',parts);
   if(count<DASH_MIN_VISUAL_ROWS || count>DASH_DASHBOARD_ROWS) return false;
   DashVisualRowCount=0;
   for(int i=0;i<count;i++)
   {
      string token=parts[i];
      if(token=="") return false;
      for(int k=0;k<StringLen(token);k++)
      {
         ushort ch=StringGetCharacter(token,k);
         if(ch<'0' || ch>'9') return false;
      }
      int level=(int)StringToInteger(token);
      if(!DashIsValidVisualLevel(level)) return false;
      if(i>0 && level<=DashVisualRows[i-1].level) return false;
      DashVisualRows[DashVisualRowCount].level=level;
      DashVisualRowCount++;
   }
   return DashIsStrictVisualRows();
}

string DashVisualRowsKeyBase()
{
   // Visual ROWS belong to the chart, not to its timeframe. A timeframe
   // change reinitializes the indicator, so the persisted key must not contain
   // _Period; otherwise the dashboard silently returns to InitialVisualRows.
   if(DashRowsStateKey=="")
      DashRowsStateKey=DASH_ROWS_STATE_PREFIX+
                       IntegerToString(ChartID())+"_"+_Symbol;
   return DashRowsStateKey;
}

string DashLegacyVisualRowsKeyBase()
{
   return DASH_ROWS_STATE_PREFIX+
          IntegerToString(ChartID())+"_"+_Symbol+
          "_TF"+IntegerToString((int)_Period);
}

bool DashLoadVisualRowsFromKey(const string base)
{
   if(!GlobalVariableCheck(base+"_COUNT"))
      return false;

   int count=(int)MathRound(GlobalVariableGet(base+"_COUNT"));
   if(count<1 || count>DASH_DASHBOARD_ROWS)
      return false;

   DashVisualRowCount=0;
   for(int i=0;i<count;i++)
   {
      string key=base+"_R"+IntegerToString(i);
      if(!GlobalVariableCheck(key))
         return false;

      int level=(int)MathRound(GlobalVariableGet(key));
      if(!DashIsValidVisualLevel(level))
         return false;
      if(i>0 && level<=DashVisualRows[i-1].level)
         return false;

      DashVisualRows[i].level=level;
      DashVisualRowCount++;
   }

   return DashIsStrictVisualRows();
}

void DashSaveVisualRows()
{
   string base=DashVisualRowsKeyBase();
   GlobalVariableSet(base+"_COUNT",(double)DashVisualRowCount);
   for(int i=0;i<DashVisualRowCount;i++)
      GlobalVariableSet(base+"_R"+IntegerToString(i),(double)DashVisualRows[i].level);
   for(int i=DashVisualRowCount;i<DASH_DASHBOARD_ROWS;i++)
      GlobalVariableDel(base+"_R"+IntegerToString(i));
}

bool DashLoadPersistedVisualRows()
{
   string base=DashVisualRowsKeyBase();

   // New storage is stable across timeframe changes.
   if(DashLoadVisualRowsFromKey(base))
      return true;

   // One-time migration from the previous timeframe-specific storage.
   // This prevents an already configured dashboard from losing its ROWS
   // immediately after updating the indicator.
   string legacyBase=DashLegacyVisualRowsKeyBase();
   if(legacyBase==base)
      return false;

   if(!DashLoadVisualRowsFromKey(legacyBase))
      return false;

   DashSaveVisualRows();
   return true;
}


void DashLoadVisualRows()
{
   DashVisualRowsLoaded=false;
   if(!DashLoadPersistedVisualRows())
   {
      if(!DashParseVisualRows(InitialVisualRows))
      {
         if(!DashParseVisualRows(DASH_DEFAULT_VISUAL_ROWS)) return;
         Print("TPDR Dashboard: InitialVisualRows invalid; using default Visual ROWS.");
      }
   }

   // Preserve the user's exact LEVEL list; do not force-add or rewrite a 5 pt row.
   DashVisualRowsLoaded=true;
}

int DashFloorGrid(const double price,const double stepPrice)
{
   if(stepPrice<=0.0)
      return 0;
   return (int)MathFloor((price-StartPrice)/stepPrice);
}

int DashCeilGrid(const double price,const double stepPrice)
{
   if(stepPrice<=0.0)
      return 0;
   return (int)MathCeil((price-StartPrice)/stepPrice);
}

double DashGridPrice(const int stateIndex,const int grid)
{
   return TickRowPrice(stateIndex,grid);
}

void DashFireLevelAlert(const int stateIndex,const int grid,const int direction)
{
   if(stateIndex<0 || stateIndex>=DashVisualRowCount)
      return;

   double alertPrice=DashGridPrice(stateIndex,grid);

   string message=StringFormat("%s: ALERT %s  LEVEL=%d  GRID=%d  REVERSAL PRICE=%s",
                               _Symbol,
                               (direction>0 ? "UP" : "DOWN"),
                               TickLevelRows[stateIndex].level,
                               grid,
                               DoubleToString(alertPrice,_Digits));

   DashAlertEnabled[stateIndex]=false;
   DashAlertActivityUntil[stateIndex]=(ulong)GetTickCount()+(ulong)MathMax(0,AlertActivityMs);
   DashSetAlertButtonState(stateIndex);
   ChartRedraw(0);

   // NotifyEvent() sends alerts; this function updates only button state and display.
}

bool DashIsAlertButtonName(const string name,int &stateIndex)
{
   string prefix=DashPrefix+"ALERT_";
   if(StringFind(name,prefix)!=0)
      return false;

   string suffix=StringSubstr(name,StringLen(prefix));
   if(suffix=="")
      return false;

   int index=(int)StringToInteger(suffix);
   if(index<0 || index>=DASH_DASHBOARD_ROWS)
      return false;

   stateIndex=index;
   return true;
}

void DashSetAlertButtonState(const int index)
{
   if(index<0 || index>=DASH_DASHBOARD_ROWS)
      return;

   string name=DashPrefix+"ALERT_"+IntegerToString(index);
   if(ObjectFind(0,name)<0)
      return;

   bool enabled=DashAlertEnabled[index];
   ulong now=(ulong)GetTickCount();
   bool activity=(DashAlertActivityUntil[index]>now);

   color buttonColor=activity ? AlertActivityColor :
                     (enabled ? AlertOnColor : AlertOffColor);

   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,buttonColor);
   ObjectSetInteger(0,name,OBJPROP_COLOR,AlertTextColor);
   ObjectSetInteger(0,name,OBJPROP_BORDER_COLOR,
                    activity ? AlertActivityColor :
                    (enabled ? AlertOnColor : BorderColor));
   ObjectSetString(0,name,OBJPROP_TEXT,"ALERT");
   ObjectSetInteger(0,name,OBJPROP_STATE,enabled);
}

void DashUpdateAlertButton(const int index,const int x,const int y,const int width,const int height)
{
   string name=DashPrefix+"ALERT_"+IntegerToString(index);

   if(ObjectFind(0,name)<0)
   {
      ResetLastError();
      if(!ObjectCreate(0,name,OBJ_BUTTON,SubWindow,0,0))
      {
         Print("TPDR Dashboard: alert button creation failed. Error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,140);
      ObjectSetString(0,name,OBJPROP_FONT,"Segoe UI");
   }

   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,x);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,width);
   ObjectSetInteger(0,name,OBJPROP_YSIZE,height);
   ObjectSetInteger(0,name,OBJPROP_FONTSIZE,DashboardFontSize);
   DashSetAlertButtonState(index);
}

void DashUpdateGraphicButton(const int index,const int x,const int y,const int width,const int height)
{
   string name=DashPrefix+"GRAPHIC_"+IntegerToString(index);

   if(ObjectFind(0,name)<0)
   {
      ResetLastError();
      if(!ObjectCreate(0,name,OBJ_BUTTON,SubWindow,0,0))
      {
         Print("TPDR Dashboard: graphic button creation failed. Error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,140);
      ObjectSetString(0,name,OBJPROP_FONT,"Segoe UI");
   }

   bool selected=(index<DashVisualRowCount &&
                  DashVisualRows[index].level==GraphLevelsPerSide);

   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,x);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,width);
   ObjectSetInteger(0,name,OBJPROP_YSIZE,height);
   ObjectSetInteger(0,name,OBJPROP_FONTSIZE,DashboardFontSize);
   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,
                    selected ? HeaderColor : C'42,50,64');
   ObjectSetInteger(0,name,OBJPROP_BORDER_COLOR,
                    selected ? HeaderColor : BorderColor);
   ObjectSetInteger(0,name,OBJPROP_COLOR,TextColor);
   ObjectSetString(0,name,OBJPROP_TEXT,"GRAPHIC");
   ObjectSetInteger(0,name,OBJPROP_STATE,selected);
}

void DashSelectGraphicLevel(const int index)
{
   if(index<0 || index>=DashVisualRowCount)
      return;

   int selectedLevel=DashVisualRows[index].level;
   if(selectedLevel<GraphLevelsPerSideMin)
      return;

   GraphLevelsPerSide=MathMax(GraphLevelsPerSideMin,
                              MathMin(GraphLevelsPerSideMax,
                                      (selectedLevel/10)*10));
   SyncTickVisualRowsFromDashboard();
   ResetGraphToCurrentPrice();
   RefreshGraph();
   DashRenderDashboard(SymbolInfoDouble(_Symbol,SYMBOL_BID));
}

bool DashIsGraphicButtonName(const string name,int &stateIndex)
{
   string prefix=DashPrefix+"GRAPHIC_";
   if(StringFind(name,prefix)!=0)
      return false;

   string suffix=StringSubstr(name,StringLen(prefix));
   if(suffix=="")
      return false;

   int index=(int)StringToInteger(suffix);
   if(index<0 || index>=DASH_DASHBOARD_ROWS)
      return false;

   stateIndex=index;
   return true;
}

void DashToggleAlert(const int index)
{
   if(index<0 || index>=DASH_DASHBOARD_ROWS)
      return;

   // Каждый клик заново устанавливает/снимает режим ожидания.
   // После повторной активации следующий подходящий crossing снова обязан вызвать ALERT.
   DashAlertEnabled[index]=!DashAlertEnabled[index];
   if(index<TickLevelRowCount)
      TickLevelRows[index].alertEnabled=DashAlertEnabled[index];
   DashAlertActivityUntil[index]=0;

   string stateText=(DashAlertEnabled[index] ? "включен" : "выключен");
   Print("TPDR Dashboard: ALERT ",TickLevelRows[index].level," pt ",stateText);

   DashSetAlertButtonState(index);
   ChartRedraw(0);
}

void DashDeleteDashboardObjects()
{
   ObjectsDeleteAll(0,DashPrefix,-1,-1);
}

void DashEnsureRect(const string name,const int x,const int y,const int width,const int height,
                const color background,const color border)
{
   if(ObjectFind(0,name)<0)
   {
      ResetLastError();
      if(!ObjectCreate(0,name,OBJ_RECTANGLE_LABEL,SubWindow,0,0))
      {
         Print("TPDR Dashboard: object creation failed. Error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_BACK,false);
   }

   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,x);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,width);
   ObjectSetInteger(0,name,OBJPROP_YSIZE,height);
   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,background);
   ObjectSetInteger(0,name,OBJPROP_COLOR,border);
   ObjectSetInteger(0,name,OBJPROP_BORDER_TYPE,BORDER_FLAT);
   ObjectSetInteger(0,name,OBJPROP_ZORDER,100);
}

void DashEnsureLabel(const string name,const int x,const int y,const int fontSize,
                 const color textColor,const string textValue)
{
   if(ObjectFind(0,name)<0)
   {
      ResetLastError();
      if(!ObjectCreate(0,name,OBJ_LABEL,SubWindow,0,0))
      {
         Print("TPDR Dashboard: label creation failed. Error=",GetLastError(),
               " Name=",name);
         return;
      }

      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetString(0,name,OBJPROP_FONT,"Segoe UI");
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,110);
   }

   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,x);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,name,OBJPROP_FONTSIZE,fontSize);
   ObjectSetInteger(0,name,OBJPROP_COLOR,textColor);
   ObjectSetString(0,name,OBJPROP_TEXT,textValue);
}

void DashDeleteHiddenDashboardRows(const int visibleCount)
{
   for(int i=visibleCount;i<DASH_DASHBOARD_ROWS;i++)
   {
      ObjectDelete(0,DashPrefix+"ROW_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"STATEBAR_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"MINUS_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"PLUS_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"LEVEL_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"PLUS_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"EDIT_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"STATE_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"TRIGGER_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"ALERT_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"GRAPHIC_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"LAST_DOWN_2_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"LAST_DOWN_1_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"LAST_UP_2_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"LAST_UP_1_"+IntegerToString(i));
   }
}

void DashEnsureButton(const string name,const int x,const int y,const int width,const int height,
                  const string textValue,const color background,const color border,
                  const color textColor,const long zorder=150)
{
   if(ObjectFind(0,name)<0)
   {
      ResetLastError();
      if(!ObjectCreate(0,name,OBJ_BUTTON,SubWindow,0,0))
      {
         Print("TPDR Dashboard: button creation failed. Error=",GetLastError()," Name=",name);
         return;
      }
      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_SELECTED,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,zorder);
      ObjectSetString(0,name,OBJPROP_FONT,"Segoe UI");
   }
   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,x);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,width);
   ObjectSetInteger(0,name,OBJPROP_YSIZE,height);
   ObjectSetInteger(0,name,OBJPROP_FONTSIZE,DashboardFontSize);
   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,background);
   ObjectSetInteger(0,name,OBJPROP_BORDER_COLOR,border);
   ObjectSetInteger(0,name,OBJPROP_COLOR,textColor);
   ObjectSetString(0,name,OBJPROP_TEXT,textValue);
}

void DashBeginLevelEdit(const int index,const int x,const int y,const int width,const int height)
{
   if(index<0 || index>=DashVisualRowCount) return;
   if(DashEditingRow>=0 && DashEditingRow!=index)
      ObjectDelete(0,DashPrefix+"EDIT_"+IntegerToString(DashEditingRow));

   string name=DashPrefix+"EDIT_"+IntegerToString(index);
   if(ObjectFind(0,name)<0)
   {
      ResetLastError();
      if(!ObjectCreate(0,name,OBJ_EDIT,SubWindow,0,0))
      {
         Print("TPDR Dashboard: level edit creation failed. Error=",GetLastError());
         return;
      }
      ObjectSetInteger(0,name,OBJPROP_CORNER,CORNER_LEFT_UPPER);
      ObjectSetInteger(0,name,OBJPROP_SELECTABLE,false);
      ObjectSetInteger(0,name,OBJPROP_HIDDEN,true);
      ObjectSetInteger(0,name,OBJPROP_ZORDER,180);
      ObjectSetString(0,name,OBJPROP_FONT,"Segoe UI");
      ObjectSetInteger(0,name,OBJPROP_ALIGN,ALIGN_CENTER);
      ObjectSetInteger(0,name,OBJPROP_READONLY,false);
   }
   ObjectSetInteger(0,name,OBJPROP_XDISTANCE,x);
   ObjectSetInteger(0,name,OBJPROP_YDISTANCE,y);
   ObjectSetInteger(0,name,OBJPROP_XSIZE,width);
   ObjectSetInteger(0,name,OBJPROP_YSIZE,height);
   ObjectSetInteger(0,name,OBJPROP_FONTSIZE,DashboardFontSize);
   ObjectSetInteger(0,name,OBJPROP_COLOR,TextColor);
   ObjectSetInteger(0,name,OBJPROP_BGCOLOR,PanelBackground);
   ObjectSetInteger(0,name,OBJPROP_BORDER_COLOR,HeaderColor);
   ObjectSetString(0,name,OBJPROP_TEXT,IntegerToString(DashVisualRows[index].level));
   DashEditingRow=index;
   ChartRedraw(0);
}

void DashCancelLevelEdit()
{
   if(DashEditingRow<0) return;
   ObjectDelete(0,DashPrefix+"EDIT_"+IntegerToString(DashEditingRow));
   DashEditingRow=-1;
   ChartRedraw(0);
}

bool DashValidateEditedLevel(const int index,const int newLevel)
{
   if(index<0 || index>=DashVisualRowCount || !DashIsValidVisualLevel(newLevel)) return false;
   if(index>0 && newLevel<=DashVisualRows[index-1].level) return false;
   if(index+1<DashVisualRowCount && newLevel>=DashVisualRows[index+1].level) return false;
   return true;
}

void DashCommitEditedLevel(const int index,const string text)
{
   if(index<0 || index>=DashVisualRowCount) { DashCancelLevelEdit(); return; }
   if(text=="") { Print("TPDR Dashboard: LEVEL edit rejected: empty value."); DashCancelLevelEdit(); return; }

   for(int k=0;k<StringLen(text);k++)
   {
      ushort ch=StringGetCharacter(text,k);
      if(ch<'0' || ch>'9')
      {
         Print("TPDR Dashboard: LEVEL edit rejected: enter an integer from 1 to 2000 pt.");
         DashCancelLevelEdit();
         return;
      }
   }

   int newLevel=(int)StringToInteger(text);
   if(!DashValidateEditedLevel(index,newLevel))
   {
      Print("TPDR Dashboard: LEVEL edit rejected: ",text,
            ". Allowed: integer 1..2000 pt; levels must remain strictly increasing.");
      DashCancelLevelEdit();
      return;
   }

   DashVisualRows[index].level=newLevel;
   DashSaveVisualRows();
   DashCancelLevelEdit();
   SyncTickVisualRowsFromDashboard();
   Print("TPDR Dashboard: Visual ROW ",index," LEVEL changed to ",newLevel," pt.");
}

bool DashAddVisualRow(const int index)
{
   if(index<0 || index>=DashVisualRowCount || DashVisualRowCount>=DASH_DASHBOARD_ROWS) return false;

   int current=DashVisualRows[index].level;
   int upper=(index+1<DashVisualRowCount ? DashVisualRows[index+1].level :
              DASH_VISUAL_LEVEL_MAX+1);
   // Кнопка + строка добавляет следующий уровень с фиксированным шагом 50 pt.
   // Базовая сетка остаётся 10/20/30/40/50; первый добавленный уровень = 100.
   const int addStep=50;
   int candidate=current+addStep;

   while(candidate<upper && candidate<=DASH_VISUAL_LEVEL_MAX && candidate>current)
   {
      bool free=true;
      for(int i=0;i<DashVisualRowCount;i++)
         if(DashVisualRows[i].level==candidate) { free=false; break; }

      if(free)
      {
         for(int i=DashVisualRowCount;i>index+1;i--)
            DashVisualRows[i]=DashVisualRows[i-1];
         DashVisualRows[index+1].level=candidate;
         DashVisualRowCount++;
         DashSaveVisualRows();
         SyncTickVisualRowsFromDashboard();
         Print("TPDR Dashboard: added Visual ROW ",candidate," pt after ",current," pt.");
         return true;
      }
      candidate+=addStep;
   }

   Print("TPDR Dashboard: cannot add ROW after ",current,
         " pt: no free valid level preserves strict order.");
   return false;
}

bool DashDeleteVisualRow(const int index)
{
   if(index<0 || index>=DashVisualRowCount) return false;
   if(DashVisualRows[index].level==5)
   {
      Print("TPDR Dashboard: mandatory ROW 5 pt cannot be deleted.");
      return false;
   }
   if(DashVisualRowCount<=DASH_MIN_VISUAL_ROWS)
   {
      Print("TPDR Dashboard: at least five Visual ROWS must remain.");
      return false;
   }

   int removed=DashVisualRows[index].level;
   for(int i=index;i<DashVisualRowCount-1;i++)
      DashVisualRows[i]=DashVisualRows[i+1];
   DashVisualRowCount--;
   DashSaveVisualRows();
    SyncTickVisualRowsFromDashboard();
   Print("TPDR Dashboard: deleted Visual ROW ",removed," pt.");
   return true;
}


// --- Dashboard visual status helpers: presentation only.
color DashStatusColor(const int direction)
{
   if(direction>0) return UpColor;
   if(direction<0) return DownColor;
   return WaitColor;
}

string DashStatusText(const int direction)
{
   if(direction>0) return "UP";
   if(direction<0) return "DOWN";
   return "WAIT";
}

void DashRenderDashboard(const double bid)
{
   // During a rebuild keep the last complete dashboard snapshot visible.
   // Before the first completed bootstrap, never publish placeholder model values.
   if(!BootstrapComplete && DashboardHasPublishedState)
      return;

   bool modelReady=BootstrapComplete;
   int levelCount=DashVisualRowCount;
   DashCalculateAutoLayout(bid);
   ObjectDelete(0,DashPrefix+"TITLE");

   int panelHeight=HeaderHeight+8+levelCount*RowHeight+12;
   int panelX=MathMax(4,PanelLeftMargin);
   int panelY=MathMax(4,PanelTopMargin);

   DashEnsureRect(DashPrefix+"BG",panelX,panelY,DashAutoPanelWidth,panelHeight,PanelBackground,BorderColor);
   DashEnsureRect(DashPrefix+"HEADER",panelX+2,panelY+2,DashAutoPanelWidth-4,HeaderHeight-4,PanelBackground,PanelBackground);

   int dashboardTitleWidth=DashMeasureTextWidth("DASHBOARD");
   int dashboardTitleX=panelX+(DashAutoPanelWidth-dashboardTitleWidth)/2;
   DashEnsureLabel(DashPrefix+"DASHBOARD_TITLE",dashboardTitleX,panelY+6,
                   DashboardFontSize,TextColor,"DASHBOARD");

   // ROWS +/- стоят у левого края панели; GRAPHIC LEVELS +/- — у правого.
   int controlsY=panelY+34;
   int levelHeaderY=controlsY;
   int levelButtonWidth=24;
   int levelValueWidth=36;
   int levelLabelWidth=DashMeasureTextWidth("GRAPHIC LEVELS");
   int levelControlsWidth=levelLabelWidth+6+levelButtonWidth+4+levelValueWidth+4+levelButtonWidth;
   int levelHeaderX=panelX+DashAutoPanelWidth-levelControlsWidth-2;
   int levelMinusX=levelHeaderX+levelLabelWidth+6;
   int levelValueX=levelMinusX+levelButtonWidth+4;
   int levelPlusX=levelValueX+levelValueWidth+4;

   DashEnsureLabel(DashPrefix+"GRAPH_ROWS_LABEL",levelHeaderX,levelHeaderY,
                   DashboardFontSize,MutedTextColor,"GRAPHIC LEVELS");
   DashEnsureButton(DashPrefix+"GRAPH_ROWS_MINUS",levelMinusX,levelHeaderY-3,
                    levelButtonWidth,22,"-",C'42,50,64',BorderColor,TextColor);
   DashEnsureLabel(DashPrefix+"GRAPH_ROWS_VALUE",levelValueX+2,levelHeaderY,
                   DashboardFontSize,TextColor,IntegerToString(GraphDisplayedLevelCount));
   DashEnsureButton(DashPrefix+"GRAPH_ROWS_PLUS",levelPlusX,levelHeaderY-3,
                    levelButtonWidth,22,"+",C'42,50,64',BorderColor,TextColor);

   int bidWidth=DashMeasureTextWidth("BID  "+DoubleToString(bid,_Digits));
   DashEnsureLabel(DashPrefix+"BID",panelX+DashAutoPanelWidth-bidWidth-16,panelY+8,DashboardFontSize,HeaderColor,
               "BID  "+DoubleToString(bid,_Digits));

   // Удаляем старые построчные +/- объекты, включая объекты от предыдущей версии.
   for(int i=0;i<DASH_DASHBOARD_ROWS;i++)
   {
      ObjectDelete(0,DashPrefix+"MINUS_"+IntegerToString(i));
      ObjectDelete(0,DashPrefix+"PLUS_"+IntegerToString(i));
   }

   int headerY=panelY+HeaderHeight-20;

   int rowsControlsX=panelX+2;
   int rowsControlsY=controlsY;
   DashEnsureLabel(DashPrefix+"ROWS_LABEL",rowsControlsX,rowsControlsY,
                   DashboardFontSize,MutedTextColor,"ROWS");
   int rowsX=rowsControlsX+DashMeasureTextWidth("ROWS")+6;
   DashEnsureButton(DashPrefix+"ROWS_MINUS",rowsX,rowsControlsY-3,
                    DashRowsButtonWidth,22,"-",
                    C'42,50,64',BorderColor,TextColor);
   DashEnsureLabel(DashPrefix+"ROWS_VALUE",
                   rowsX+DashRowsButtonWidth+4,rowsControlsY,
                   DashboardFontSize,TextColor,IntegerToString(levelCount));
   DashEnsureButton(DashPrefix+"ROWS_PLUS",
                    rowsX+DashRowsButtonWidth+DashRowsValueWidth+8,
                    rowsControlsY-3,DashRowsButtonWidth,22,"+",
                    C'42,50,64',BorderColor,TextColor);
   DashEnsureLabel(DashPrefix+"COL_LEVEL",panelX+DashColLevelX,headerY,
                   DashboardFontSize,MutedTextColor,"LEVEL");
   DashEnsureLabel(DashPrefix+"COL_STATUS",panelX+DashColStatusX,headerY,DashboardFontSize,MutedTextColor,"DIRECTION");
   DashEnsureLabel(DashPrefix+"COL_TRIGGER",panelX+DashColTriggerX,headerY,DashboardFontSize,MutedTextColor,"REVERSAL AT");
   DashEnsureLabel(DashPrefix+"COL_ALERT",panelX+DashColAlertX,headerY,DashboardFontSize,MutedTextColor,"ALERT");
   DashEnsureLabel(DashPrefix+"COL_GRAPHIC",panelX+DashColGraphicX,headerY,DashboardFontSize,MutedTextColor,"GRAPHIC");

   for(int row=0;row<levelCount;row++)
   {
      int index=levelCount-1-row;
      int y=panelY+HeaderHeight+8+row*RowHeight;
      string suffix=IntegerToString(index);
      int direction=(modelReady ? TickLevelRows[index].direction : 0);

      DashEnsureRect(DashPrefix+"ROW_"+suffix,panelX+2,y,DashAutoPanelWidth-4,RowHeight-1,
                 (row%2==0 ? RowBackground : RowBackgroundAlt),
                 (row==0 || row==levelCount-1 ? BorderColor :
                  (row%5==0 ? BorderColor : RowBackgroundAlt)));
      DashEnsureRect(DashPrefix+"STATEBAR_"+suffix,panelX+3,y+2,5,RowHeight-5,
                 DashStatusColor(direction),DashStatusColor(direction));

      if(DashEditingRow!=index)
         DashEnsureButton(DashPrefix+"LEVEL_"+suffix,panelX+DashColLevelX,y+1,DashLevelButtonWidth,RowHeight-3,
                      IntegerToString(DashVisualRows[index].level)+" pt",RowBackground,BorderColor,
                      DashStatusColor(direction));
      else
         ObjectDelete(0,DashPrefix+"LEVEL_"+suffix);

      DashEnsureLabel(DashPrefix+"STATE_"+suffix,panelX+DashColStatusX,y+3,DashboardFontSize,
                  DashStatusColor(direction),(modelReady ? DashStatusText(direction) : "LOADING"));

      string reversalAtText=(modelReady && TickLevelRows[index].direction!=0 &&
                             TickLevelRows[index].reversalAtPrice>0.0 ?
         DoubleToString(TickLevelRows[index].reversalAtPrice,_Digits) : "");
      // REVERSAL AT показывает цену разворота и окрашивается цветом
      // будущего направления: UP -> DownColor, DOWN -> UpColor.
      int reversalDirection=(direction!=0 ? -direction : 0);
      color reversalAtColor=DashStatusColor(reversalDirection);
      DashEnsureLabel(DashPrefix+"TRIGGER_"+suffix,panelX+DashColTriggerX,y+3,DashboardFontSize,
                  reversalAtColor,reversalAtText);

      int alertButtonWidth=DashMeasureTextWidth("ALERT")+16;
      DashUpdateAlertButton(index,panelX+DashColAlertX,y+1,alertButtonWidth,RowHeight-3);

      int graphicButtonWidth=DashMeasureTextWidth("GRAPHIC")+16;
      DashUpdateGraphicButton(index,panelX+DashColGraphicX,y+1,graphicButtonWidth,RowHeight-3);

      // LAST-DOWN/LAST-UP columns are intentionally not displayed.
   }

   DashDeleteHiddenDashboardRows(levelCount);
   ChartRedraw(0);
   if(modelReady)
      DashboardHasPublishedState=true;
}

int DashInit()
{
   if(StartPrice<=0.0 || BufferPoints<0 || HistoryBootstrapTicks<100 || HistoryChunkSize<100 ||
      UpdateIntervalMs<10 || UpdateIntervalMs>2000 ||
      RowHeight<20 || HeaderHeight<45 || DashboardFontSize<7 ||
      DashboardFontSize>18 || PanelLeftMargin<0 || PanelTopMargin<0 ||
      AlertActivityMs<0 || AlertActivityMs>10000)
      return INIT_PARAMETERS_INCORRECT;

   IndicatorSetString(INDICATOR_SHORTNAME,DashShortName);

   MqlTick attachTick;
   if(!SymbolInfoTick(_Symbol,attachTick) || attachTick.bid<=0.0)
      return INIT_FAILED;

   DashLoadVisualRows();
   if(!DashVisualRowsLoaded || !DashIsStrictVisualRows())
      return INIT_PARAMETERS_INCORRECT;

   // Remove dashboard objects from older versions before recreating them
   // in the indicator subwindow instead of the main chart.
   DashDeleteDashboardObjects();

   for(int i=0;i<DASH_DASHBOARD_ROWS;i++)
   {
      DashAlertEnabled[i]=false;
      DashAlertActivityUntil[i]=0;
   }

   return INIT_SUCCEEDED;
}

void DashChartEvent(const int id,const long &lparam,const double &dparam,const string &sparam)
{
   if(id==CHARTEVENT_KEYDOWN && DashEditingRow>=0 && lparam==DASH_KEY_ESCAPE)
   {
      DashCancelLevelEdit();
      return;
   }

   if(id==CHARTEVENT_OBJECT_ENDEDIT)
   {
      string editPrefix=DashPrefix+"EDIT_";
      if(StringFind(sparam,editPrefix)==0)
      {
         int index=(int)StringToInteger(StringSubstr(sparam,StringLen(editPrefix)));
         string textValue="";
         if(ObjectGetString(0,sparam,OBJPROP_TEXT,0,textValue))
            DashCommitEditedLevel(index,textValue);
         else
            DashCancelLevelEdit();
         return;
      }
   }

   if(id!=CHARTEVENT_OBJECT_CLICK)
      return;

   if(sparam==DashPrefix+"GRAPH_ROWS_MINUS" ||
      sparam==DashPrefix+"GRAPH_ROWS_PLUS")
   {
      HandleLevelRowsButtonClick(sparam);
      DashRenderDashboard(SymbolInfoDouble(_Symbol,SYMBOL_BID));
      return;
   }

   if(sparam==DashPrefix+"ROWS_MINUS")
   {
      // Удаляется только самый высокий добавленный LEVEL.
      if(DashVisualRowCount>DASH_MIN_VISUAL_ROWS &&
         DashDeleteVisualRow(DashVisualRowCount-1))
         DashRenderDashboard(SymbolInfoDouble(_Symbol,SYMBOL_BID));
      return;
   }

   if(sparam==DashPrefix+"ROWS_PLUS")
   {
      // Новый LEVEL добавляется только сверху с шагом 50 pt: 50 -> 100 -> 150 -> ...
      if(DashVisualRowCount<DASH_DASHBOARD_ROWS &&
         DashAddVisualRow(DashVisualRowCount-1))
         DashRenderDashboard(SymbolInfoDouble(_Symbol,SYMBOL_BID));
      return;
   }

   string levelPrefix=DashPrefix+"LEVEL_";
   if(StringFind(sparam,levelPrefix)==0)
   {
      int index=(int)StringToInteger(StringSubstr(sparam,StringLen(levelPrefix)));
      if(index>=0 && index<DashVisualRowCount)
      {
         string rowName=DashPrefix+"ROW_"+IntegerToString(index);
         int y=(ObjectFind(0,rowName)>=0 ?
                (int)ObjectGetInteger(0,rowName,OBJPROP_YDISTANCE) :
                PanelTopMargin+HeaderHeight+8);
         DashBeginLevelEdit(index,
                        (int)ObjectGetInteger(0,sparam,OBJPROP_XDISTANCE),
                        y+1,DashLevelButtonWidth,RowHeight-3);
      }
      return;
   }

   int graphicIndex=-1;
   if(DashIsGraphicButtonName(sparam,graphicIndex))
   {
      DashSelectGraphicLevel(graphicIndex);
      return;
   }

   int index=-1;
   if(DashIsAlertButtonName(sparam,index))
   {
      DashToggleAlert(index);
      return;
   }
}

void DashDeinit(const int reason)
{

   DashDeleteDashboardObjects();
}

void DashTimer()
{
   if(!BootstrapComplete)
      return;

   MqlTick current;
   if(!SymbolInfoTick(_Symbol,current) || current.bid<=0.0)
      return;

   DashRenderDashboard(current.bid);
}

int DashCalculate(const int rates_total,const int prev_calculated)
{
   return rates_total;
}





void SyncTickVisualRowsFromDashboard()
{
   if(DashVisualRowCount<DASH_MIN_VISUAL_ROWS || DashVisualRowCount>DASH_VISUAL_ROW_MAX)
      return;

   int selectedLevel=GraphLevelsPerSide;
   bool selectedExists=false;
   for(int i=0;i<DashVisualRowCount;i++)
   {
      if(DashVisualRows[i].level==selectedLevel)
      {
         selectedExists=true;
         break;
      }
   }

   int targetCount=DashVisualRowCount+(selectedExists ? 0 : 1);
   bool changed=(TickLevelRowCount!=targetCount);

   if(!changed)
   {
      for(int i=0;i<DashVisualRowCount;i++)
      {
         if(TickLevelRows[i].level!=DashVisualRows[i].level)
         {
            changed=true;
            break;
         }
      }
   }

   if(!changed && !selectedExists &&
      (TickLevelRowCount<=DashVisualRowCount ||
       TickLevelRows[DashVisualRowCount].level!=selectedLevel))
      changed=true;

   if(!changed)
      return;

   ArrayResize(TickLevelRows,targetCount);
   TickLevelRowCount=targetCount;

   for(int i=0;i<DASH_DASHBOARD_ROWS;i++)
   {
      DashAlertEnabled[i]=false;
      DashAlertActivityUntil[i]=0;
   }

   for(int i=0;i<DashVisualRowCount;i++)
      TickLevelRows[i].level=DashVisualRows[i].level;

   if(!selectedExists)
      TickLevelRows[DashVisualRowCount].level=selectedLevel;

   for(int i=0;i<TickLevelRowCount;i++)
      ResetTickLevelRowState(TickLevelRows[i]);

   if(ModelTickCount>=2)
   {
      // Новый LEVEL может потребовать дополнительной истории до публикации состояния.
      HistoryBootstrapTargetTicks=MathMax(HistoryBootstrapTargetTicks,ModelTickCount);
      BootstrapComplete=false;
      LiveMode=false;
   }
}

int TickInit()
{
   if(StartPrice<=0.0 || BufferPoints<0 ||
      ReversalArrowsHistory<0 || ReversalArrowsHistory>20 ||
      MaxModelHistoryTicks<100 ||
      HistoryChunkSize<100 || HistoryGraphTicks<100 || HistoryBootstrapTicks<100 ||
      InitialViewTicks<1 || MinViewTicks<1 || MinViewTicks>InitialViewTicks ||
      MinViewTicks>MathMax(MaxGraphSegments,MaxModelHistoryTicks))
      return INIT_PARAMETERS_INCORRECT;


   ShortName=_Symbol;
   IndicatorSetString(INDICATOR_SHORTNAME,ShortName);
   LegacyPriceObjectsCleaned=false;
   DeleteLegacyPriceObjects();
   LegacyGraphLabelsCleaned=false;
   LastGraphLabelNameCount=0;
   ArrayResize(LastGraphLabelNames,0);
   GraphLevelsPerSide=MathMax(GraphLevelsPerSideMin,
                              MathMin(GraphLevelsPerSideMax,
                                      (GraphLevelsPerSide/10)*10));
   if(GraphLevelsPerSide<GraphLevelsPerSideMin)
      GraphLevelsPerSide=GraphLevelsPerSideMin;
   LoadGraphDisplayedLevelCount();
   GraphHistoryCapacity=MathMax(100,MathMax(MaxGraphSegments,MaxModelHistoryTicks));
   SyncTickVisualRowsFromDashboard();

   // Высоту подокна задаёт терминал; Canvas подстраивается под доступную область.
   IndicatorSetInteger(INDICATOR_FIXED_MINIMUM,false);
   IndicatorSetInteger(INDICATOR_FIXED_MAXIMUM,false);

   MqlTick attachTick;

   if(!SymbolInfoTick(_Symbol,attachTick) || attachTick.bid<=0.0)
      return INIT_FAILED;

   AttachMsc=attachTick.time_msc;
   CursorMsc=AttachMsc;
   CursorSameMsc=0;
   HistoryBootstrapTargetTicks=0;

   ArrayResize(TickPrices,MathMax(100,GraphHistoryCapacity),
                MathMax(100,GraphHistoryCapacity));
   ArrayResize(SignalMarks,0);
   ArrayResize(ModelTickPrices,MathMax(100,MaxModelHistoryTicks),
                MathMax(100,MaxModelHistoryTicks));
   ModelTickCount=0;
   ModelTickHead=0;
   TickCount=0;
   TickHead=0;
   TickSerial=0;
   HavePreviousBid=false;
   PreviousBid=0.0;
   BootstrapComplete=false;
   LiveMode=false;

   ScaleCenterGrid=FloorGridForViewport(attachTick.bid);
   ScaleInitialized=false;
   AutoScaleInitialized=false;
   ViewSpan=MathMin(MathMax(InitialViewTicks,MinViewTicks),GraphHistoryCapacity);
   ViewEndOffset=0;
   DragActive=false;
   DragStartX=0;
   DragStartOffset=0;

   // Runtime-модель восстанавливается единым bootstrap-проходом.
   FitInitialArrowHistory();

   // Preserve chart-wide settings before enabling the events this indicator needs.
   long previousMouseScroll=0;
   long previousMouseMove=0;
   long previousMouseWheel=0;
   if(!ChartGetInteger(0,CHART_MOUSE_SCROLL,0,previousMouseScroll) ||
      !ChartGetInteger(0,CHART_EVENT_MOUSE_MOVE,0,previousMouseMove) ||
      !ChartGetInteger(0,CHART_EVENT_MOUSE_WHEEL,0,previousMouseWheel))
   {
      Print("TPDR: failed to read chart event settings. Error=",GetLastError());
      return INIT_FAILED;
   }

   PreviousChartMouseScroll=(previousMouseScroll!=0);
   PreviousChartEventMouseMove=(previousMouseMove!=0);
   PreviousChartEventMouseWheel=(previousMouseWheel!=0);
   ChartEventSettingsCaptured=true;
   MouseInTickSubwindow=false;

   if(!ChartSetInteger(0,CHART_EVENT_MOUSE_MOVE,true) ||
      !ChartSetInteger(0,CHART_EVENT_MOUSE_WHEEL,true) ||
      !ChartSetInteger(0,CHART_MOUSE_SCROLL,(long)PreviousChartMouseScroll))
   {
      int error=GetLastError();
      RestoreChartEventSettings();
      Print("TPDR: failed to configure chart event settings. Error=",error);
      return INIT_FAILED;
   }

   return INIT_SUCCEEDED;
}

bool RestoreChartEventSettings()
{
   if(!ChartEventSettingsCaptured)
      return true;

   bool ok=true;
   if(!ChartSetInteger(0,CHART_MOUSE_SCROLL,(long)PreviousChartMouseScroll))
      ok=false;
   if(!ChartSetInteger(0,CHART_EVENT_MOUSE_MOVE,(long)PreviousChartEventMouseMove))
      ok=false;
   if(!ChartSetInteger(0,CHART_EVENT_MOUSE_WHEEL,(long)PreviousChartEventMouseWheel))
      ok=false;

   if(ok)
      ChartEventSettingsCaptured=false;
   else
      Print("TPDR: failed to restore one or more chart event settings. Error=",GetLastError());
   return ok;
}

void TickDeinit(const int reason)
{
   RestoreChartEventSettings();

   if(CanvasReady)
   {
      TickCanvas.Destroy();
      CanvasReady=false;
   }
   CanvasWidth=0;
   CanvasHeight=0;
   CanvasSubWindow=-1;

   EventKillTimer();
   ResetButtonHeld=false;
   DeleteObjectsByPrefix();
}

bool UpdateMarketState()
{
   // Единый владелец состояния рынка.
   // OnCalculate() и OnTimer() только запускают эту функцию, но сама обработка
   // history/live выполняется здесь ровно одним и тем же кодом.
   if(SubWindow<0)
      return false;

   if(!BootstrapComplete)
   {
      if(!BootstrapHistory())
         return false;
   }
   else
   {
      if(!ProcessLiveTicks())
         return false;
   }

   return true;
}

void TickTimer()
{
   // Таймер также может довести bootstrap до готового состояния: при создании
   // подокна OnCalculate иногда вызывается раньше, чем ChartWindowFind() готов.
   SubWindow=ChartWindowFind(0,ShortName);
   if(SubWindow<0)
      return;

   // Пока bootstrap не завершён, состояние и отображение не публикуются.
   // OnTimer() не имеет права рисовать промежуточную историю.
   if(!UpdateMarketState())
      return;

   // RESET выполняется только по событию нажатия кнопки.
   // Таймер не должен повторять тяжёлый полный reset каждые 100 мс.
   MqlTick current;
   if(!SymbolInfoTick(_Symbol,current) || current.bid<=0.0)
      return;

   if(!EnsureCanvas())
      return;
   UpdateSubwindowScale(current.bid);
   RenderGraph(current.bid);
   InitialArrowHistoryScalePending=false;
   ChartRedraw(0);
}

void HandleHorizontalZoom(const int xCursor,const int delta)
{
   if(TickCount<=1 || GetGraphWidth()<=1 || delta==0)
      return;

   int oldSpan=GetViewCount();
   int oldStart=GetViewStartIndex();

   int newSpan=oldSpan;
   if(delta>0)
      newSpan=MathMax(MinViewTicks,oldSpan/2);
   else
      newSpan=MathMin(MathMin(GraphHistoryCapacity,TickCount),MathMax(MinViewTicks,oldSpan*2));

   newSpan=MathMax(1,MathMin(newSpan,TickCount));

   int graphWidth=GetGraphWidth();
   double ratio=(double)MathMax(0,MathMin(xCursor,graphWidth-1))/
      (double)MathMax(1,graphWidth-1);

   int anchorOffset=(int)MathRound(ratio*(double)MathMax(0,oldSpan-1));
   int anchorIndex=oldStart+anchorOffset;

   ViewSpan=newSpan;

   int newAnchorOffset=(int)MathRound(ratio*(double)MathMax(0,newSpan-1));
   int newStart=anchorIndex-newAnchorOffset;
   newStart=MathMax(0,MathMin(newStart,TickCount-newSpan));

   ViewEndOffset=TickCount-newSpan-newStart;
   ViewEndOffset=MathMax(0,MathMin(ViewEndOffset,TickCount-newSpan));
}

void HandleHorizontalDrag(const int x)
{
   if(!DragActive || TickCount<=1 || GetGraphWidth()<=1)
      return;

   InitialViewLayoutActive=false;

   int span=GetViewCount();
   int dx=x-DragStartX;
   int shift=(int)MathRound((double)dx*(double)span/(double)GetGraphWidth());

   int maxOffset=MathMax(0,TickCount-span);
   ViewEndOffset=DragStartOffset+shift;
   ViewEndOffset=MathMax(0,MathMin(ViewEndOffset,maxOffset));
}

bool IsCursorInTickSubwindow(const int y)
{
   if(SubWindow<=0)
      return false;

   int top=(int)ChartGetInteger(0,CHART_WINDOW_YDISTANCE,SubWindow);
   int height=(int)ChartGetInteger(0,CHART_HEIGHT_IN_PIXELS,SubWindow);

   return height>0 && y>=top && y<top+height;
}

void UpdateMouseScrollTarget(const int y)
{
   MouseInTickSubwindow=IsCursorInTickSubwindow(y);

   // Respect the user's original setting outside our subwindow, and keep the
   // terminal scroll disabled while our vertical drag handlers own the pointer.
   bool enableScroll=(PreviousChartMouseScroll && !MouseInTickSubwindow &&
                      !VerticalScaleDragActive && !VerticalPanDragActive);
   bool currentScroll=(ChartGetInteger(0,CHART_MOUSE_SCROLL)!=0);
   if(currentScroll!=enableScroll)
   {
      if(!ChartSetInteger(0,CHART_MOUSE_SCROLL,(long)enableScroll))
      {
         if(!MouseScrollSetErrorLogged)
            Print("TPDR: failed to update CHART_MOUSE_SCROLL. Error=",GetLastError());
         MouseScrollSetErrorLogged=true;
      }
      else
         MouseScrollSetErrorLogged=false;
   }
}

bool IsCursorOnVerticalScaleHandle(const int x,const int y)
{
   if(!MouseInTickSubwindow || CanvasWidth<=0 || CanvasHeight<=0)
      return false;

   int chartWidth=(int)ChartGetInteger(0,CHART_WIDTH_IN_PIXELS,0);
   if(chartWidth<=CanvasWidth)
      return false;

   // Вертикальный zoom начинается в правой области цен, вне Canvas.
   int left=CanvasWidth;
   int right=chartWidth;
   return x>=left && x<right;
}

void BeginVerticalPanDrag(const int y)
{
   VerticalPanDragActive=true;
   VerticalScaleManual=true;
   VerticalPanDragStartY=y;
   VerticalPanDragStartCenterPrice=(ViewportCenterPrice>0.0 ?
                                     ViewportCenterPrice :
                                     ViewportRayPrice(ScaleCenterGrid));
}

void HandleVerticalPanDrag(const int y)
{
   if(!VerticalPanDragActive || CanvasHeight<=1 ||
      GraphScaleMax<=GraphScaleMin)
      return;

   int deltaY=y-VerticalPanDragStartY;
   double pricePerPixel=(GraphScaleMax-GraphScaleMin)/
                         (double)MathMax(1,CanvasHeight-1);
   // Мышь вверх -> график вверх; мышь вниз -> график вниз.
   ViewportCenterPrice=NormalizeDouble(
      VerticalPanDragStartCenterPrice+(double)deltaY*pricePerPixel,_Digits);
   ScaleCenterGrid=FloorGridForViewport(ViewportCenterPrice);
   VerticalPanDragStartY=y;
   VerticalPanDragStartCenterPrice=ViewportCenterPrice;
   VerticalPanDragActive=true;
   RefreshGraph();
}

void EndVerticalPanDrag()
{
   VerticalPanDragActive=false;
}

void BeginVerticalScaleDrag(const int y)
{
   VerticalScaleDragActive=true;
   VerticalScaleDragStartY=y;
   VerticalScaleDragStartHalfRange=MathMax(VerticalScaleHalfRange,GetViewportLevelStepPrice()*0.20);
   VerticalScaleManual=true;
}

void HandleVerticalScaleDrag(const int y)
{
   if(!VerticalScaleDragActive)
      return;

   int deltaY=y-VerticalScaleDragStartY;

   // Вверх = приближение по вертикали, вниз = отдаление.
   // Масштаб рассчитывается относительно исходной точки drag, поэтому
   // несколько mouse-move событий не накапливают округление.
   double totalDeltaY=(double)(y-VerticalScaleDragStartY);
   double factor=MathExp(totalDeltaY*VerticalScaleDragSensitivity);
   double newHalfRange=VerticalScaleDragStartHalfRange*factor;

   int upCount=MathMax(1,(TickLevelRowCount/2));
   int downCount=MathMax(1,(TickLevelRowCount-(TickLevelRowCount/2)));
   double minimumHalfRange=GetViewportLevelStepPrice()*MathMax(1,MathMax(upCount,downCount));
   minimumHalfRange+=GetViewportLevelStepPrice()*0.10;

   double maximumHalfRange=MathMax(minimumHalfRange*2.0,GetViewportLevelStepPrice()*2000.0);

   VerticalScaleHalfRange=MathMax(minimumHalfRange,
                                   MathMin(maximumHalfRange,newHalfRange));

   RefreshGraph();
}

void EndVerticalScaleDrag()
{
   VerticalScaleDragActive=false;
}

void TickChartEvent(const int id,const long &lparam,const double &dparam,const string &sparam)
{
   if(id==CHARTEVENT_OBJECT_CLICK)
   {
      if(sparam==Prefix+"ZOOM_MINUS" ||
         sparam==Prefix+"ZOOM_PLUS" ||
         sparam==Prefix+"RESET_CURRENT")
      {
         HandleZoomButtonClick(sparam);
         return;
      }
   }

   if(id==CHARTEVENT_MOUSE_WHEEL)
   {
      int flags=(int)(lparam>>32);
      int xCursor=(int)(short)lparam;
      int yCursor=(int)(short)(lparam>>16);

      UpdateMouseScrollTarget(yCursor);

      if(!MouseInTickSubwindow)
         return;

      InitialViewLayoutActive=false;

      if((flags&0x0004)!=0)
      {
         int span=GetViewCount();
         int step=MathMax(1,span/10);
         int maxOffset=MathMax(0,TickCount-span);

         ViewEndOffset+=(dparam>0.0 ? -step : step);
         ViewEndOffset=MathMax(0,MathMin(ViewEndOffset,maxOffset));
      }
      else
      {
         HandleHorizontalZoom(xCursor,(int)dparam);
         ViewEndOffset=0;
      }

      RefreshGraph();
      return;
   }

   if(id==CHARTEVENT_MOUSE_MOVE)
   {
      int x=(int)lparam;
      int y=(int)dparam;
      int state=(int)StringToInteger(sparam);
      bool leftDown=((state&1)!=0);

      UpdateMouseScrollTarget(y);

      if(!MouseInTickSubwindow)
         DragActive=false;

      if(VerticalScaleDragActive)
      {
         if(leftDown)
         {
            ChartSetInteger(0,CHART_MOUSE_SCROLL,(long)false);
            HandleVerticalScaleDrag(y);
            DragActive=false;
            VerticalPanDragActive=false;
            return;
         }

         EndVerticalScaleDrag();
         UpdateMouseScrollTarget(y);
      }
      else if(VerticalPanDragActive)
      {
         if(leftDown)
         {
            ChartSetInteger(0,CHART_MOUSE_SCROLL,(long)false);
            HandleVerticalPanDrag(y);
            DragActive=false;
            return;
         }

         EndVerticalPanDrag();
         UpdateMouseScrollTarget(y);
      }

      if(leftDown && MouseInTickSubwindow &&
         IsCursorOnVerticalScaleHandle(x,y))
      {
         BeginVerticalScaleDrag(y);
         HandleVerticalScaleDrag(y);
         DragActive=false;
         VerticalPanDragActive=false;
         return;
      }

      if(leftDown && MouseInTickSubwindow &&
         IsPointInsideObject(Prefix+"RESET_CURRENT",x,y))
      {
         ResetButtonHeld=true;
         ObjectSetInteger(0,Prefix+"RESET_CURRENT",OBJPROP_STATE,true);
      }
      else if(!leftDown)
      {
         ResetButtonHeld=false;
         if(ObjectFind(0,Prefix+"RESET_CURRENT")>=0)
            ObjectSetInteger(0,Prefix+"RESET_CURRENT",OBJPROP_STATE,false);
      }
      else if(!IsPointInsideObject(Prefix+"RESET_CURRENT",x,y))
      {
         ResetButtonHeld=false;
         if(ObjectFind(0,Prefix+"RESET_CURRENT")>=0)
            ObjectSetInteger(0,Prefix+"RESET_CURRENT",OBJPROP_STATE,false);
      }

      if(leftDown && MouseInTickSubwindow && !ResetButtonHeld)
      {
         if(!DragActive && !VerticalPanDragActive)
         {
            if(!PointerDragTracking)
            {
               PointerDragTracking=true;
               DragStartX=x;
               DragStartOffset=ViewEndOffset;
               VerticalPanDragStartY=y;
            }

            int dx=x-DragStartX;
            int dy=y-VerticalPanDragStartY;

            if(MathAbs((double)dy)>MathAbs((double)dx) && MathAbs(dy)>=4)
            {
               BeginVerticalPanDrag(y);
               DragActive=false;
               HandleVerticalPanDrag(y);
               return;
            }

            if(MathAbs(dx)>=4)
               DragActive=true;
         }

         if(VerticalPanDragActive)
         {
            HandleVerticalPanDrag(y);
            return;
         }

         if(DragActive)
         {
            HandleHorizontalDrag(x);
            RefreshGraph();
         }
      }
      else if(!leftDown || !MouseInTickSubwindow)
      {
         DragActive=false;
         PointerDragTracking=false;
         EndVerticalPanDrag();
      }

      return;
   }

   if(id==CHARTEVENT_CHART_CHANGE)
   {
      static int lastPeriod=(int)_Period;
      bool periodChanged=((int)_Period!=lastPeriod);
      lastPeriod=(int)_Period;

      // Resolve the current indicator subwindow on every chart geometry
      // event. Dragging the upper border changes window geometry and can
      // invalidate the old bitmap's dimensions or owning subwindow.
      int currentSubWindow=ChartWindowFind(0,ShortName);
      if(currentSubWindow>=0)
         SubWindow=currentSubWindow;
      else
         return;

      if(periodChanged)
      {
         // Смена таймфрейма сбрасывает только горизонтальный просмотр.
         // Вертикальный масштаб и абсолютные Y-координаты истории сохраняются.
         ViewSpan=MathMin(MathMax(InitialViewTicks,MinViewTicks),MathMax(1,TickCount));
         ViewEndOffset=0;
         InitialViewLayoutActive=true;
         FitInitialArrowHistory();
      }

      if(!BootstrapComplete)
         return;

      MqlTick current;
      if(SymbolInfoTick(_Symbol,current) && current.bid>0.0)
      {
         if(EnsureCanvas())
         {
            UpdateSubwindowScale(current.bid);
            RenderGraph(current.bid);
            InitialArrowHistoryScalePending=false;
         }
      }
      ChartRedraw(0);
      return;
   }
}

int TickCalculate(const int rates_total,const int prev_calculated)
{
   SubWindow=ChartWindowFind(0,ShortName);

   if(SubWindow<0)
      return rates_total;

   if(!UpdateMarketState())
      return rates_total;

   MqlTick current;
   if(SymbolInfoTick(_Symbol,current) && current.bid>0.0)
   {
      if(EnsureCanvas())
      {
         UpdateSubwindowScale(current.bid);
         RenderGraph(current.bid);
      }
   }

   ChartRedraw(0);
   return rates_total;
}




int OnInit()
{
   int dashResult=DashInit();
   if(dashResult!=INIT_SUCCEEDED)
      return dashResult;

   int tickResult=TickInit();
   if(tickResult!=INIT_SUCCEEDED)
   {
      TickDeinit(REASON_INITFAILED);
      DashDeinit(REASON_INITFAILED);
      return tickResult;
   }

   IndicatorSetString(INDICATOR_SHORTNAME,_Symbol);
   int timerMs=MathMax(10,MathMin(2000,UpdateIntervalMs));
   if(!EventSetMillisecondTimer(timerMs))
   {
      Print("CodeLock-Dashboard-TickGraphic: EventSetMillisecondTimer failed. Error=",GetLastError());
      TickDeinit(REASON_INITFAILED);
      DashDeinit(REASON_INITFAILED);
      return INIT_FAILED;
   }

   return INIT_SUCCEEDED;
}

void OnDeinit(const int reason)
{
   EventKillTimer();
   TickDeinit(reason);
   DashDeinit(reason);
}

void OnTimer()
{
   SyncTickVisualRowsFromDashboard();
   TickTimer();
   DashTimer();
}

void OnChartEvent(const int id,const long &lparam,const double &dparam,const string &sparam)
{
   DashChartEvent(id,lparam,dparam,sparam);
   TickChartEvent(id,lparam,dparam,sparam);
}

int OnCalculate(const int rates_total,const int prev_calculated,
                const int begin,const double &price[])
{
   // Этот индикатор не использует price[] как источник рыночной модели.
   // Begin сохраняется в стандартной сигнатуре Calculate event.
   DashCalculate(rates_total,prev_calculated);
   return TickCalculate(rates_total,prev_calculated);
}