ewsdr/VfoOverlay.pas

unit VfoOverlay;

{$mode objfpc}{$H+}

{
  TVfoOverlay — накладка-«флаг слайса» поверх спектра, стиль SmartSDR.
  Компоновка (сверху вниз):
    шапка   : [A]  2.7k              SPLIT   [TX]
    метр    : NR NB ANF SNB   ▂▃▅▇█▆▄   -20 +20 +40
    частота : 7.125.000                        S 7
    бар     : 🔊──○──   MODE    DSP    AUD
  Нижний бар компактный; клик по MODE/DSP/AUD раскрывает fly-out панель ПОД баром
  (карточка растёт в высоту). Слайдер громкости — click/drag по треку.
  Рендер: кэш-битмап (BlendBitmapKey с key-color) + dirty-флаг, как раньше.
}

interface

uses
  Classes, SysUtils, Controls, Graphics, Types, Math;

const
  VFO_OVERLAY_ALPHA = 210;
  OVL_W             = 280;    // ширина карточки

type
  TModeFilterEvent  = procedure(Mode: Integer; FilterBW: Integer) of object;
  TDSPChangeEvent   = procedure(NRMode, NBMode: Integer; SNBOn, ANFOn: Boolean) of object;
  TAGCChangeEvent   = procedure(AGCMode: Integer) of object;
  TVolumeEvent      = procedure(Vol: Integer) of object;
  TAudioDeviceEvent = procedure(DevIndex: Integer; const DevName: string) of object;

  TFlyPanel = (fpNone, fpMode, fpDsp, fpAud);

  TVfoOverlay = class(TCustomControl)
  private
    FMode:       Integer;
    FFilterBW:   Integer;
    FVfoHz:      Double;
    FSMeterDB:   Double;
    FModeFilter: array[0..7] of Integer;

    FNRMode: Integer;   // 0=off, 1..4
    FNBMode: Integer;   // 0=off, 1=NB, 2=NB2
    FSNBOn:  Boolean;
    FANFOn:  Boolean;
    FAGCMode: Integer;  // 0=FAST 1=MED 2=SLOW 3=LONG 4=OFF

    FVolume:  Integer;  // 0..100
    FMuted:   Boolean;
    FSplit:   Boolean;
    FTx:      Boolean;   // передача идёт (красный)
    FTxSel:   Boolean;   // этот слайс выбран для передачи (янтарный)
    FSlice:   Char;     // буква слайса ('A')

    FDevNames: TStringList;         // имена устройств вывода
    FDevIdx:   array of Integer;    // соответствующие PortAudio-индексы (-1=default)
    FCurDev:   string;              // имя текущего устройства ('' = default)

    FPanel:   TFlyPanel;            // открытая fly-out панель
    FVolTrack: TRect;              // трек громкости (локальные координаты)
    FVolDrag:  Boolean;

    FOnSelect:      TModeFilterEvent;
    FOnDSPChange:   TDSPChangeEvent;
    FOnAGCChange:   TAGCChangeEvent;
    FOnVolume:      TVolumeEvent;
    FOnMute:        TNotifyEvent;
    FOnAudioDevice: TAudioDeviceEvent;
    FOnSplit:       TNotifyEvent;
    FOnTxSelect:    TNotifyEvent;
    FOnInvalidate:  TNotifyEvent;

    FHitRects:   array[0..63] of TRect;
    FHitActions: array[0..63] of Integer;
    FHitCount:   Integer;
    FHotIdx:     Integer;
    FCacheBitmap: TBitmap;
    FCacheDirty:  Boolean;

    procedure DrawSelf(C: TCanvas; W, H: Integer);
    procedure DrawButton(C: TCanvas; const R: TRect; const Lbl: string;
                         Active, Hot: Boolean; FontSz: Integer);
    procedure DrawIndicator(C: TCanvas; X, Y: Integer; const Lbl: string; On_: Boolean);
    procedure DrawBadge(C: TCanvas; const R: TRect; const Lbl: string;
                        BgColor, TxtColor: TColor);
    procedure DrawSpeaker(C: TCanvas; X, Y: Integer; Muted: Boolean);
    procedure DrawMeterBar(C: TCanvas; X, Y, BW, BH: Integer);
    procedure DrawModePanel(C: TCanvas; X, Y, RowW: Integer);
    procedure DrawDspPanel(C: TCanvas; X, Y, RowW: Integer);
    procedure DrawAudPanel(C: TCanvas; X, Y, RowW: Integer);
    procedure RegisterHit(const HR: TRect; HV: Integer);
    function  FormatFreq(Hz: Double): string;
    function  GetFilterBWForMode(ModeIdx, FilterIdx: Integer): Integer;
    function  GetFilterLblForMode(ModeIdx, FilterIdx: Integer): string;
    function  GetFilterCountForMode(ModeIdx: Integer): Integer;
    function  PanelContentH: Integer;
    function  ComputeHeight: Integer;
    procedure SetPanel(P: TFlyPanel);
    procedure ApplyVolFromX(LX: Integer);
    procedure RequestInvalidate;
    procedure DoHit(HV: Integer);

  protected
    procedure Paint; override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState;
                        X, Y: Integer); override;
    procedure MouseMove(Shift: TShiftState; X, Y: Integer); override;
    procedure MouseLeave; override;

  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    procedure DrawOverlay(Target: TBitmap; W, H: Integer);
    procedure DrawOverlayBitmap(Target: TBitmap);
    function HandleMouseDown(Button: TMouseButton; X, Y: Integer): Boolean;
    function HandleMouseMove(X, Y: Integer): Boolean;
    function HandleMouseUp(X, Y: Integer): Boolean;
    function HandleMouseLeave: Boolean;
    procedure SetState(AMode, ABW: Integer; AVfoHz, ASMeterDB: Double);
    procedure SetDSPState(ANRMode, ANBMode: Integer; ASNBOn, AANFOn: Boolean;
                          AAGCMode: Integer);
    procedure SetExtState(AVolume: Integer; AMuted, ASplit, ATx, ATxSel: Boolean);
    procedure SetAudioDevices(Names: TStrings; const Indices: array of Integer;
                              const CurName: string);
    procedure UpdateSMeter(DB: Double);
    procedure UpdateVfo(AVfoHz: Double);
    property HotIdx: Integer read FHotIdx;
    property BaseHeight: Integer read ComputeHeight;
    property OnSelect:      TModeFilterEvent  read FOnSelect      write FOnSelect;
    property OnDSPChange:   TDSPChangeEvent   read FOnDSPChange   write FOnDSPChange;
    property OnAGCChange:   TAGCChangeEvent   read FOnAGCChange   write FOnAGCChange;
    property OnVolume:      TVolumeEvent      read FOnVolume      write FOnVolume;
    property OnMute:        TNotifyEvent      read FOnMute        write FOnMute;
    property OnAudioDevice: TAudioDeviceEvent read FOnAudioDevice write FOnAudioDevice;
    property OnSplit:       TNotifyEvent      read FOnSplit       write FOnSplit;
    property OnTxSelect:    TNotifyEvent      read FOnTxSelect    write FOnTxSelect;
    property OnInvalidate:  TNotifyEvent      read FOnInvalidate  write FOnInvalidate;
  end;

implementation

const
  KEY_COLOR = TColor($00FF00FF);

  // Значения хит-тестов
  //   режимы:  -(I+1) = -1..-8
  //   фильтры: BW в Гц (>0)
  //   AGC:     HIT_AGC_PICK_BASE+I
  //   устройства: HIT_DEV_BASE+I
  HIT_NR       = -9;
  HIT_NB       = -10;
  HIT_SNB      = -11;
  HIT_ANF      = -12;
  HIT_BAR_MODE = -20;
  HIT_BAR_DSP  = -21;
  HIT_BAR_AUD  = -22;
  HIT_MUTE     = -23;
  HIT_VOL      = -24;
  HIT_SPLIT    = -25;
  HIT_TX       = -26;
  HIT_AGC_PICK_BASE = 100000;
  HIT_DEV_BASE      = 200000;

  AGC_NAMES: array[0..4] of string = ('FAST', 'MED', 'SLOW', 'LONG', 'OFF');

  // Геометрия карточки
  PAD     = 6;
  HDR_H   = 16;
  HDR_BADGE_H = 12;   // высота бейджей A/SPLIT/TX (верх на CurY, низ приподнят)
  MET_H   = 21;
  FRQ_H   = 26;
  BAR_H   = 24;
  ROW_H   = 20;
  IGAP    = 2;
  OVL_BASE_H = PAD + HDR_H + MET_H + FRQ_H + BAR_H + PAD;   // = 96

  // Палитра
  CLR_CARD_BG  = TColor($00191919);
  CLR_BORDER   = TColor($00484848);
  CLR_SEP      = TColor($00303030);
  CLR_TEXT     = TColor($00E4E4E4);
  CLR_DIM      = TColor($00707070);
  CLR_ACCENT   = TColor($0040FF80);   // зелёный акцент
  CLR_ACCENT_D = TColor($00103018);   // тёмный акцент (фон активной)
  CLR_BTN_NORM = TColor($00262626);
  CLR_BTN_HOT  = TColor($00383838);
  CLR_FREQ     = TColor($0050FF80);
  CLR_SVAL     = TColor($0030C8FF);
  CLR_BAR_BG   = TColor($00101010);
  CLR_TX_ON    = TColor($000030E0);   // красный TX идёт (BGR)
  CLR_TX_SEL   = TColor($0010A8F0);   // янтарный: слайс выбран для передачи
  CLR_SPLIT_ON = TColor($0020C0FF);   // оранжевый SPLIT

  OVL_MODE_COUNT = 8;
  OVL_MODE_NAMES: array[0..7] of string = (
    'LSB','USB','DSB','CWL','CWU','FM','AM','SAM');

  SSB_BW:  array[0..5] of Integer = (1800,2100,2400,2700,3300,3800);
  SSB_LBL: array[0..5] of string  = ('1.8K','2.1K','2.4K','2.7K','3.3K','3.8K');
  DSB_BW:  array[0..5] of Integer = (16000,12000,10000,8000,5200,4000);
  DSB_LBL: array[0..5] of string  = ('16K','12K','10K','8K','5.2K','4K');
  CW_BW:   array[0..5] of Integer = (500,250,150,100,50,1000);
  CW_LBL:  array[0..5] of string  = ('500','250','150','100','50','1K');
  FM_BW:   array[0..1] of Integer = (11000, 16000);
  FM_LBL:  array[0..1] of string  = ('NFM', 'FM');
  AM_BW:   array[0..5] of Integer = (20000,16000,12000,10000,8000,6000);
  AM_LBL:  array[0..5] of string  = ('20K','16K','12K','10K','8K','6K');

  DB_S: array[1..9] of Double = (-121,-115,-109,-103,-97,-91,-85,-79,-73);

procedure BlendBitmapKey(Target, Source: TBitmap; DstX, DstY: Integer; Alpha: Byte);
var
  Y, X, SX0, SY0, SX1, SY1, TY, InvA: Integer;
  SrcRow, DstRow: PByte;
begin
  if (Target = nil) or (Source = nil) or (Alpha = 0) then Exit;
  SX0 := 0; SY0 := 0;
  SX1 := Source.Width; SY1 := Source.Height;
  if DstX < 0 then begin SX0 := -DstX; DstX := 0; end;
  if DstY < 0 then begin SY0 := -DstY; DstY := 0; end;
  if DstX + (SX1 - SX0) > Target.Width  then SX1 := SX0 + Target.Width  - DstX;
  if DstY + (SY1 - SY0) > Target.Height then SY1 := SY0 + Target.Height - DstY;
  if (SX1 <= SX0) or (SY1 <= SY0) then Exit;

  InvA := 255 - Alpha;
  Target.BeginUpdate(False);
  Source.BeginUpdate(False);
  try
    for Y := SY0 to SY1 - 1 do
    begin
      TY := DstY + (Y - SY0);
      SrcRow := PByte(Source.ScanLine[Y]);
      DstRow := PByte(Target.ScanLine[TY]);
      if (SrcRow = nil) or (DstRow = nil) then Continue;
      Inc(SrcRow, SX0 * 4);
      Inc(DstRow, DstX * 4);
      for X := SX0 to SX1 - 1 do
      begin
{$IFDEF DARWIN}
        if not ((SrcRow[1] = $FF) and (SrcRow[2] = $00) and (SrcRow[3] = $FF)) then
        begin
          DstRow[1] := Byte((Alpha * SrcRow[1] + InvA * DstRow[1]) div 255);
          DstRow[2] := Byte((Alpha * SrcRow[2] + InvA * DstRow[2]) div 255);
          DstRow[3] := Byte((Alpha * SrcRow[3] + InvA * DstRow[3]) div 255);
        end;
{$ELSE}
        if not ((SrcRow[0] = $FF) and (SrcRow[1] = $00) and (SrcRow[2] = $FF)) then
        begin
          DstRow[0] := Byte((Alpha * SrcRow[0] + InvA * DstRow[0]) div 255);
          DstRow[1] := Byte((Alpha * SrcRow[1] + InvA * DstRow[1]) div 255);
          DstRow[2] := Byte((Alpha * SrcRow[2] + InvA * DstRow[2]) div 255);
        end;
{$ENDIF}
        Inc(SrcRow, 4);
        Inc(DstRow, 4);
      end;
    end;
  finally
    Source.EndUpdate(False);
    Target.EndUpdate(False);
  end;
end;

function DBmToSLabel(DB: Double): string;
var
  I, Over: Integer;
begin
  if DB >= DB_S[9] then
  begin
    Over := Round(DB - DB_S[9]);
    if Over < 5 then Result := 'S9'
    else
    begin
      Over := ((Over + 5) div 10) * 10;
      if Over = 0 then Over := 10;
      Result := 'S9+' + IntToStr(Over);
    end;
  end
  else if DB <= DB_S[1] then Result := 'S1'
  else
  begin
    Result := 'S1';
    for I := 1 to 8 do
      if DB >= DB_S[I] then Result := 'S' + IntToStr(I);
  end;
end;

{ ---- Фильтры по режиму ---- }

function TVfoOverlay.GetFilterBWForMode(ModeIdx, FilterIdx: Integer): Integer;
begin
  case ModeIdx of
    0,1: Result := SSB_BW[FilterIdx];
    2:   Result := DSB_BW[FilterIdx];
    3,4: Result := CW_BW[FilterIdx];
    5:   Result := FM_BW[FilterIdx];
  else   Result := AM_BW[FilterIdx];
  end;
end;

function TVfoOverlay.GetFilterLblForMode(ModeIdx, FilterIdx: Integer): string;
begin
  case ModeIdx of
    0,1: Result := SSB_LBL[FilterIdx];
    2:   Result := DSB_LBL[FilterIdx];
    3,4: Result := CW_LBL[FilterIdx];
    5:   Result := FM_LBL[FilterIdx];
  else   Result := AM_LBL[FilterIdx];
  end;
end;

function TVfoOverlay.GetFilterCountForMode(ModeIdx: Integer): Integer;
begin
  if ModeIdx = 5 then Result := 2 else Result := 6;
end;

{ ---- Lifecycle ---- }

constructor TVfoOverlay.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  ControlStyle := ControlStyle + [csOpaque];
  FMode      := 1;
  FFilterBW  := 2700;
  FVfoHz     := 14200000;
  FSMeterDB  := -121;
  FHitCount  := 0;
  FHotIdx    := -1;
  FModeFilter[0] := 2700;  FModeFilter[1] := 2700;  FModeFilter[2] := 8000;
  FModeFilter[3] := 500;   FModeFilter[4] := 500;   FModeFilter[5] := 11000;
  FModeFilter[6] := 8000;  FModeFilter[7] := 8000;
  FNRMode := 0; FNBMode := 0; FSNBOn := False; FANFOn := False; FAGCMode := 0;
  FVolume := 70; FMuted := False; FSplit := False; FTx := False;
  FTxSel := True; FSlice := 'A';
  FPanel  := fpNone;
  FVolDrag := False;
  FDevNames := TStringList.Create;
  FCurDev := '';
  FCacheBitmap := TBitmap.Create;
  FCacheBitmap.PixelFormat := pf32bit;
  FCacheDirty := True;
  Width  := OVL_W;
  Height := OVL_BASE_H;
  Cursor := crHandPoint;
end;

destructor TVfoOverlay.Destroy;
begin
  FDevNames.Free;
  FCacheBitmap.Free;
  inherited Destroy;
end;

procedure TVfoOverlay.RegisterHit(const HR: TRect; HV: Integer);
begin
  if FHitCount > High(FHitRects) then Exit;
  FHitRects[FHitCount]   := HR;
  FHitActions[FHitCount] := HV;
  Inc(FHitCount);
end;

procedure TVfoOverlay.RequestInvalidate;
begin
  FCacheDirty := True;
  inherited Invalidate;
  if Assigned(FOnInvalidate) then FOnInvalidate(Self);
end;

function TVfoOverlay.FormatFreq(Hz: Double): string;
var
  T, iM, iK, iH: Int64;
begin
  // Целочисленная математика (как FreqDispA := Round(FVfoA)): арифметика в double
  // на частотах ~1e10 (QO-100) накапливает ошибку в десятки Гц.
  T  := Round(Hz);
  iM := T div 1000000;
  iK := (T div 1000) mod 1000;
  iH := T mod 1000;
  Result := Format('%d.%3.3d.%3.3d', [iM, iK, iH]);
end;

{ ---- Высота с учётом fly-out ---- }

function TVfoOverlay.PanelContentH: Integer;
begin
  case FPanel of
    fpMode: Result := ROW_H*2 + IGAP + ROW_H + IGAP;   // 2 ряда режимов + ряд фильтров
    fpDsp:  Result := ROW_H + IGAP + ROW_H;            // toggles + AGC
    fpAud:  Result := Max(1, FDevNames.Count) * 17;
  else      Result := 0;
  end;
end;

function TVfoOverlay.ComputeHeight: Integer;
begin
  if FPanel = fpNone then Result := OVL_BASE_H
  else Result := OVL_BASE_H + IGAP + PanelContentH + PAD;
end;

procedure TVfoOverlay.SetPanel(P: TFlyPanel);
begin
  if FPanel = P then FPanel := fpNone else FPanel := P;
  Height := ComputeHeight;
  RequestInvalidate;
end;

{ ---- Примитивы отрисовки ---- }

// Масштаб яркости цвета (для стеклянного градиента/фаски).
function GlossColor(Base: TColor; F: Double): TColor;
var
  R, G, B: Byte;
begin
  RedGreenBlue(ColorToRGB(Base), R, G, B);
  Result := RGBToColor(EnsureRange(Round(R * F), 0, 255),
                       EnsureRange(Round(G * F), 0, 255),
                       EnsureRange(Round(B * F), 0, 255));
end;

procedure TVfoOverlay.DrawButton(C: TCanvas; const R: TRect; const Lbl: string;
  Active, Hot: Boolean; FontSz: Integer);
var
  Base: TColor;
  Y, H: Integer;
  RowT, Gloss: Double;
begin
  if Active then      Base := CLR_ACCENT
  else if Hot then    Base := CLR_BTN_HOT
  else                Base := CLR_BTN_NORM;

  // Скруглённая тёмная база = форма + рамка-фаска.
  C.Brush.Color := GlossColor(Base, 0.58);
  C.Brush.Style := bsSolid;
  C.Pen.Color   := GlossColor(Base, 0.42);
  C.Pen.Style   := psSolid;
  C.RoundRect(R.Left, R.Top, R.Right, R.Bottom, 5, 5);

  // Стеклянный вертикальный градиент: ярче вверху, темнее внизу (как ползунок зума).
  H := R.Bottom - R.Top;
  C.Pen.Style := psClear;
  for Y := R.Top + 1 to R.Bottom - 2 do
  begin
    if H > 3 then RowT := (Y - (R.Top + 1)) / (H - 3) else RowT := 0.0;
    Gloss := 1.30 - 0.60 * RowT;
    C.Brush.Color := GlossColor(Base, Gloss);
    C.FillRect(Rect(R.Left + 2, Y, R.Right - 2, Y + 1));
  end;

  // Блик сверху + тень снизу (объём).
  C.Pen.Style := psSolid;
  C.Pen.Color := GlossColor(Base, 1.55);
  C.Line(R.Left + 2, R.Top + 1, R.Right - 2, R.Top + 1);
  C.Pen.Color := GlossColor(Base, 0.40);
  C.Line(R.Left + 2, R.Bottom - 2, R.Right - 2, R.Bottom - 2);

  if Active then C.Font.Color := CLR_CARD_BG
  else           C.Font.Color := CLR_TEXT;
  C.Font.Name  := 'Courier New';
  C.Font.Size  := FontSz;
  C.Font.Style := [];
  C.Brush.Style := bsClear;
  C.TextOut(R.Left + (R.Right - R.Left - C.TextWidth(Lbl)) div 2,
            R.Top  + (R.Bottom - R.Top - C.TextHeight('A')) div 2, Lbl);
end;

procedure TVfoOverlay.DrawIndicator(C: TCanvas; X, Y: Integer; const Lbl: string;
  On_: Boolean);
begin
  C.Font.Name := 'Courier New';
  C.Font.Size := 7;
  C.Font.Style := [fsBold];
  C.Brush.Style := bsClear;
  if On_ then C.Font.Color := CLR_ACCENT else C.Font.Color := CLR_DIM;
  C.TextOut(X, Y, Lbl);
end;

procedure TVfoOverlay.DrawBadge(C: TCanvas; const R: TRect; const Lbl: string;
  BgColor, TxtColor: TColor);
begin
  C.Brush.Color := BgColor;
  C.Brush.Style := bsSolid;
  C.Pen.Style   := psSolid;
  C.Pen.Color   := BgColor;
  C.RoundRect(R.Left, R.Top, R.Right, R.Bottom, 4, 4);
  C.Font.Name := 'Courier New';
  C.Font.Size := 7;
  C.Font.Style := [fsBold];
  C.Font.Color := TxtColor;
  C.Brush.Style := bsClear;
  C.TextOut(R.Left + (R.Right - R.Left - C.TextWidth(Lbl)) div 2,
            R.Top  + (R.Bottom - R.Top - C.TextHeight('A')) div 2, Lbl);
end;

procedure TVfoOverlay.DrawSpeaker(C: TCanvas; X, Y: Integer; Muted: Boolean);
var
  Pts: array[0..5] of TPoint;
  Col: TColor;
begin
  if Muted then Col := CLR_DIM else Col := CLR_TEXT;
  Pts[0] := Point(X,     Y+4);
  Pts[1] := Point(X+3,   Y+4);
  Pts[2] := Point(X+7,   Y);
  Pts[3] := Point(X+7,   Y+12);
  Pts[4] := Point(X+3,   Y+8);
  Pts[5] := Point(X,     Y+8);
  C.Brush.Color := Col;
  C.Brush.Style := bsSolid;
  C.Pen.Color   := Col;
  C.Pen.Style   := psSolid;
  C.Polygon(Pts);
  if Muted then
  begin
    C.Pen.Color := CLR_TX_ON;
    C.Pen.Width := 2;
    C.MoveTo(X+9, Y);   C.LineTo(X+14, Y+12);
    C.Pen.Width := 1;
  end
  else
  begin
    C.Pen.Color := CLR_ACCENT;
    C.MoveTo(X+9,  Y+3); C.LineTo(X+11, Y+6); C.LineTo(X+9,  Y+9);
    C.MoveTo(X+11, Y+1); C.LineTo(X+14, Y+6); C.LineTo(X+11, Y+11);
  end;
end;

// Цвет S-метра по УРОВНЮ (dBm): тёмно-зелёный → зелёный → жёлтый → красный.
// Опоры привязаны к S-делениям, а не к длине бара: красный достигается уже
// к ~S9+18, чтобы сильные сигналы (S9+10) были ближе к красному.
function MeterGradColor(DB: Double): TColor;
const
  DS: array[0..3] of Double  = (-121, -85, -73, -55);   // S1, S7, S9, S9+18
  RS: array[0..3] of Integer = (   0,  30,  245,  235);
  GS: array[0..3] of Integer = (  85, 205,  215,   35);
  BS: array[0..3] of Integer = (   0,  40,    0,   20);
var
  I, R, G, B: Integer;
  T: Double;
begin
  if DB <= DS[0] then      begin R := RS[0]; G := GS[0]; B := BS[0]; end
  else if DB >= DS[3] then begin R := RS[3]; G := GS[3]; B := BS[3]; end
  else
  begin
    I := 0;
    while (I < 3) and (DB > DS[I+1]) do Inc(I);
    T := (DB - DS[I]) / (DS[I+1] - DS[I]);
    R := RS[I] + Round((RS[I+1] - RS[I]) * T);
    G := GS[I] + Round((GS[I+1] - GS[I]) * T);
    B := BS[I] + Round((BS[I+1] - BS[I]) * T);
  end;
  Result := TColor((B shl 16) or (G shl 8) or R);
end;

procedure TVfoOverlay.DrawMeterBar(C: TCanvas; X, Y, BW, BH: Integer);
const
  DB_MIN = -127.0;
  DB_MAX =  -13.0;
  S_POS: array[0..7] of Double = (-121,-109,-97,-85,-73,-53,-33,-13);
  S_LBL: array[0..7] of string = ('1','3','5','7','9','+20','+40','+60');
var
  I, BarEnd, PX, BarH, TW, Col: Integer;
  T: Double;
begin
  BarH := BH - 12;
  C.Brush.Color := CLR_BAR_BG;
  C.Brush.Style := bsSolid;
  C.Pen.Style   := psClear;
  C.FillRect(Rect(X, Y, X+BW, Y+BarH));

  T      := Max(0.0, Min(1.0, (FSMeterDB - DB_MIN) / (DB_MAX - DB_MIN)));
  BarEnd := Min(X + Round(T * BW), X + BW - 1);
  // Плавный градиент по всей ширине: цвет колонки = позиция на шкале.
  C.Brush.Style := bsSolid;
  C.Pen.Style   := psClear;
  Col := X + 1;
  while Col < BarEnd do
  begin
    C.Brush.Color := MeterGradColor(DB_MIN + (Col - X) / BW * (DB_MAX - DB_MIN));
    C.FillRect(Rect(Col, Y+1, Col+1, Y+BarH-1));
    Inc(Col);
  end;

  C.Pen.Style   := psSolid;
  C.Pen.Color   := CLR_BORDER;
  C.Brush.Style := bsClear;
  C.Rectangle(X, Y, X+BW, Y+BarH);

  C.Font.Name  := 'Courier New';
  C.Font.Size  := 7;
  C.Font.Style := [];
  // Последнюю метку (+60 = правый край) не рисуем — вылезает за границу.
  for I := 0 to High(S_POS) - 1 do
  begin
    T  := (S_POS[I] - DB_MIN) / (DB_MAX - DB_MIN);
    PX := X + Round(T * BW);
    TW := C.TextWidth(S_LBL[I]);
    if I < 4 then C.Font.Color := CLR_DIM else C.Font.Color := CLR_ACCENT;
    C.Pen.Color := CLR_DIM;
    C.MoveTo(PX, Y+BarH); C.LineTo(PX, Y+BarH+2);
    C.TextOut(PX - TW div 2, Y+BarH+2, S_LBL[I]);
  end;
end;

{ ---- Fly-out панели ---- }

procedure TVfoOverlay.DrawModePanel(C: TCanvas; X, Y, RowW: Integer);
var
  I, Col, Row, BX, BY, BW, FiltN, FBX, FBRight, BV: Integer;
  HR: TRect;
begin
  BW := (RowW - 3*3) div 4;   // 4 колонки, зазор 3
  for I := 0 to OVL_MODE_COUNT - 1 do
  begin
    Col := I mod 4;  Row := I div 4;
    BX  := X + Col * (BW + 3);
    BY  := Y + Row * (ROW_H + IGAP);
    HR  := Rect(BX, BY, BX + BW, BY + ROW_H);
    DrawButton(C, HR, OVL_MODE_NAMES[I], I = FMode,
               (FHotIdx >= 0) and (FHitActions[FHotIdx] = -(I+1)), 7);
    RegisterHit(HR, -(I+1));
  end;

  // Ряд фильтров текущего режима
  FiltN := GetFilterCountForMode(FMode);
  BY := Y + 2*(ROW_H + IGAP);
  FBX := X;
  for I := 0 to FiltN - 1 do
  begin
    FBRight := X + ((I+1) * RowW) div FiltN;
    BV := GetFilterBWForMode(FMode, I);
    HR := Rect(FBX, BY, FBRight - 2, BY + ROW_H);
    DrawButton(C, HR, GetFilterLblForMode(FMode, I), BV = FFilterBW,
               (FHotIdx >= 0) and (FHitActions[FHotIdx] = BV), 7);
    RegisterHit(HR, BV);
    FBX := FBRight;
  end;
end;

procedure TVfoOverlay.DrawDspPanel(C: TCanvas; X, Y, RowW: Integer);
var
  I, BX, BRight: Integer;
  HR: TRect;
  Lbl: string;
  Act: Boolean;
const
  TOG_HITS: array[0..3] of Integer = (HIT_NR, HIT_NB, HIT_SNB, HIT_ANF);
begin
  // Ряд 1: NR / NB / SNB / ANF (тумблеры)
  BX := X;
  for I := 0 to 3 do
  begin
    BRight := X + ((I+1) * RowW) div 4;
    HR := Rect(BX, Y, BRight - 2, Y + ROW_H);
    case I of
      0: begin
           case FNRMode of 1: Lbl:='NR'; 2: Lbl:='NR2'; 3: Lbl:='NR3'; 4: Lbl:='NR4';
           else Lbl:='NR'; end;
           Act := FNRMode <> 0;
         end;
      1: begin if FNBMode = 2 then Lbl:='NB2' else Lbl:='NB'; Act := FNBMode <> 0; end;
      2: begin Lbl:='SNB'; Act := FSNBOn; end;
    else   begin Lbl:='ANF'; Act := FANFOn; end;
    end;
    DrawButton(C, HR, Lbl, Act,
               (FHotIdx >= 0) and (FHitActions[FHotIdx] = TOG_HITS[I]), 7);
    RegisterHit(HR, TOG_HITS[I]);
    BX := BRight;
  end;
  // Ряд 2: AGC режимы
  Inc(Y, ROW_H + IGAP);
  BX := X;
  for I := 0 to 4 do
  begin
    BRight := X + ((I+1) * RowW) div 5;
    HR := Rect(BX, Y, BRight - 2, Y + ROW_H);
    DrawButton(C, HR, AGC_NAMES[I], I = FAGCMode,
               (FHotIdx >= 0) and (FHitActions[FHotIdx] = HIT_AGC_PICK_BASE + I), 6);
    RegisterHit(HR, HIT_AGC_PICK_BASE + I);
    BX := BRight;
  end;
end;

procedure TVfoOverlay.DrawAudPanel(C: TCanvas; X, Y, RowW: Integer);
var
  I: Integer;
  HR: TRect;
  Nm: string;
  Cur: Boolean;
begin
  C.Font.Name := 'Courier New';
  C.Font.Size := 7;
  C.Font.Style := [];
  if FDevNames.Count = 0 then
  begin
    C.Font.Color := CLR_DIM;
    C.Brush.Style := bsClear;
    C.TextOut(X, Y + 2, '(нет устройств)');
    Exit;
  end;
  for I := 0 to FDevNames.Count - 1 do
  begin
    HR := Rect(X, Y + I*17, X + RowW, Y + I*17 + 16);
    Nm := FDevNames[I];
    Cur := (Nm = FCurDev) or ((FCurDev = '') and (I = 0));
    if Cur then C.Brush.Color := CLR_ACCENT_D
    else if (FHotIdx >= 0) and (FHitActions[FHotIdx] = HIT_DEV_BASE + I) then
      C.Brush.Color := CLR_BTN_HOT
    else C.Brush.Color := CLR_BTN_NORM;
    C.Brush.Style := bsSolid;
    C.Pen.Color := C.Brush.Color;
    C.Pen.Style := psSolid;
    C.RoundRect(HR.Left, HR.Top, HR.Right, HR.Bottom, 4, 4);
    if Cur then C.Font.Color := CLR_ACCENT else C.Font.Color := CLR_TEXT;
    C.Brush.Style := bsClear;
    if C.TextWidth(Nm) > RowW - 8 then
      while (Length(Nm) > 1) and (C.TextWidth(Nm + '…') > RowW - 8) do
        SetLength(Nm, Length(Nm) - 1);
    if Nm <> FDevNames[I] then Nm := Nm + '…';
    C.TextOut(HR.Left + 4, HR.Top + (16 - C.TextHeight('A')) div 2, Nm);
    RegisterHit(HR, HIT_DEV_BASE + I);
  end;
end;

{ ---- Основная отрисовка ---- }

procedure TVfoOverlay.DrawSelf(C: TCanvas; W, H: Integer);
var
  FreqStr, SStr, BWStr: string;
  CurY, X, RW, i: Integer;
  R: TRect;
  BarL, BarW, MeterX: Integer;
begin
  FHitCount := 0;

  // Фон карточки
  C.Brush.Color := CLR_CARD_BG;
  C.Brush.Style := bsSolid;
  C.Pen.Color   := CLR_BORDER;
  C.Pen.Style   := psSolid;
  C.Pen.Width   := 1;
  C.RoundRect(0, 0, W, H, 7, 7);

  X   := PAD;
  RW  := W - PAD*2;
  CurY := PAD;

  { --- Шапка: [A] BW ... SPLIT [TX] --- }
  DrawBadge(C, Rect(X, CurY, X+16, CurY+HDR_BADGE_H), FSlice, CLR_ACCENT, CLR_CARD_BG);
  // ширина фильтра
  if FFilterBW >= 1000 then BWStr := Format('%.1fk', [FFilterBW/1000.0])
  else                      BWStr := IntToStr(FFilterBW);
  C.Font.Name := 'Courier New'; C.Font.Size := 8; C.Font.Style := [];
  C.Font.Color := CLR_DIM; C.Brush.Style := bsClear;
  C.TextOut(X + 22, CurY + 1, BWStr);
  // TX badge (правый край) — кликабельно: выбор TX-слайса.
  // передача идёт → красный; слайс выбран для TX → янтарный; иначе → нейтральный.
  R := Rect(W - PAD - 26, CurY, W - PAD, CurY + HDR_BADGE_H);
  if FTx then          DrawBadge(C, R, 'TX', CLR_TX_ON,  clWhite)
  else if FTxSel then  DrawBadge(C, R, 'TX', CLR_TX_SEL, CLR_CARD_BG)
  else                 DrawBadge(C, R, 'TX', CLR_BTN_NORM, CLR_DIM);
  RegisterHit(R, HIT_TX);
  // SPLIT (левее TX) — кликабельно
  R := Rect(W - PAD - 26 - 44, CurY, W - PAD - 26 - 4, CurY + HDR_BADGE_H);
  if FSplit then DrawBadge(C, R, 'SPLIT', CLR_SPLIT_ON, CLR_CARD_BG)
  else           DrawBadge(C, R, 'SPLIT', CLR_BTN_NORM, CLR_DIM);
  RegisterHit(R, HIT_SPLIT);
  Inc(CurY, HDR_H);

  { --- Метр: индикаторы + сигнал-бар --- }
  DrawIndicator(C, X,      CurY + 2, 'NR',  FNRMode <> 0);
  DrawIndicator(C, X + 24, CurY + 2, 'NB',  FNBMode <> 0);
  DrawIndicator(C, X + 48, CurY + 2, 'ANF', FANFOn);
  DrawIndicator(C, X + 80, CurY + 2, 'SNB', FSNBOn);
  MeterX := X + 112;
  DrawMeterBar(C, MeterX, CurY, W - PAD - MeterX, MET_H);
  Inc(CurY, MET_H);

  { --- Частота + S --- }
  FreqStr := FormatFreq(FVfoHz);
  C.Font.Name := 'Courier New'; C.Font.Size := 13; C.Font.Style := [fsBold];
  C.Font.Color := CLR_FREQ; C.Brush.Style := bsClear;
  C.TextOut(X + 2, CurY, FreqStr);
  SStr := DBmToSLabel(FSMeterDB);
  C.Font.Size := 9; C.Font.Color := CLR_SVAL;
  C.TextOut(W - PAD - C.TextWidth(SStr) - 2, CurY + 6, SStr);
  Inc(CurY, FRQ_H);

  { --- Нижний бар: 🔊 vol | MODE DSP AUD --- }
  DrawSpeaker(C, X, CurY + (BAR_H-12) div 2, FMuted);
  RegisterHit(Rect(X-1, CurY, X+16, CurY+BAR_H), HIT_MUTE);
  // трек громкости
  BarL := X + 20;
  BarW := 56;
  FVolTrack := Rect(BarL, CurY + BAR_H div 2 - 3, BarL + BarW, CurY + BAR_H div 2 + 3);
  C.Brush.Color := CLR_BTN_NORM; C.Brush.Style := bsSolid;
  C.Pen.Color := CLR_BTN_NORM; C.Pen.Style := psSolid;
  C.RoundRect(FVolTrack.Left, FVolTrack.Top, FVolTrack.Right, FVolTrack.Bottom, 3, 3);
  i := BarL + Round(FVolume/100.0 * BarW);
  if not FMuted then
  begin
    C.Brush.Color := CLR_ACCENT; C.Pen.Color := CLR_ACCENT;
    C.RoundRect(FVolTrack.Left, FVolTrack.Top, i, FVolTrack.Bottom, 3, 3);
  end;
  // ручка
  C.Brush.Color := CLR_TEXT; C.Pen.Color := CLR_TEXT;
  C.Ellipse(i-4, CurY + BAR_H div 2 - 5, i+4, CurY + BAR_H div 2 + 5);
  RegisterHit(Rect(BarL-4, CurY, BarL + BarW + 4, CurY + BAR_H), HIT_VOL);

  // 3 кнопки бара справа от трека
  BarL := X + 20 + BarW + 8;
  RW   := (W - PAD) - BarL;
  R := Rect(BarL, CurY + 2, BarL + (RW - 8) div 3, CurY + BAR_H - 2);
  DrawButton(C, R, 'MODE', FPanel = fpMode,
             (FHotIdx >= 0) and (FHitActions[FHotIdx] = HIT_BAR_MODE), 7);
  RegisterHit(R, HIT_BAR_MODE);
  R := Rect(R.Right + 4, CurY + 2, R.Right + 4 + (RW - 8) div 3, CurY + BAR_H - 2);
  DrawButton(C, R, 'DSP', FPanel = fpDsp,
             (FHotIdx >= 0) and (FHitActions[FHotIdx] = HIT_BAR_DSP), 7);
  RegisterHit(R, HIT_BAR_DSP);
  R := Rect(R.Right + 4, CurY + 2, W - PAD, CurY + BAR_H - 2);
  DrawButton(C, R, 'AUD', FPanel = fpAud,
             (FHotIdx >= 0) and (FHitActions[FHotIdx] = HIT_BAR_AUD), 7);
  RegisterHit(R, HIT_BAR_AUD);
  Inc(CurY, BAR_H);

  { --- Fly-out --- }
  if FPanel <> fpNone then
  begin
    Inc(CurY, IGAP);
    C.Pen.Color := CLR_SEP; C.Pen.Style := psSolid;
    C.MoveTo(PAD, CurY); C.LineTo(W - PAD, CurY);
    Inc(CurY, IGAP + 1);
    case FPanel of
      fpMode: DrawModePanel(C, PAD, CurY, W - PAD*2);
      fpDsp:  DrawDspPanel(C, PAD, CurY, W - PAD*2);
      fpAud:  DrawAudPanel(C, PAD, CurY, W - PAD*2);
    end;
  end;
end;

procedure TVfoOverlay.Paint;
begin
  DrawSelf(Canvas, Width, Height);
end;

procedure TVfoOverlay.DrawOverlay(Target: TBitmap; W, H: Integer);
begin
  if (not Visible) or (Target = nil) or (Width <= 0) or (Height <= 0) then Exit;
  if (Left >= W) or (Top >= H) then Exit;

  if (FCacheBitmap.Width <> Width) or (FCacheBitmap.Height <> Height) then
  begin
    FCacheBitmap.SetSize(Width, Height);
    FCacheDirty := True;
  end;
  if FCacheDirty then
  begin
    FCacheBitmap.Canvas.Brush.Color := KEY_COLOR;
    FCacheBitmap.Canvas.Brush.Style := bsSolid;
    FCacheBitmap.Canvas.Pen.Style := psClear;
    FCacheBitmap.Canvas.FillRect(Rect(0, 0, Width, Height));
    DrawSelf(FCacheBitmap.Canvas, Width, Height);
    FCacheDirty := False;
  end;
  BlendBitmapKey(Target, FCacheBitmap, Left, Top, VFO_OVERLAY_ALPHA);
end;

procedure TVfoOverlay.DrawOverlayBitmap(Target: TBitmap);
begin
  if (Target = nil) or (Width <= 0) or (Height <= 0) then Exit;
  Target.PixelFormat := pf32bit;
  Target.SetSize(Width, Height);
  Target.Canvas.Brush.Color := KEY_COLOR;
  Target.Canvas.Brush.Style := bsSolid;
  Target.Canvas.Pen.Style := psClear;
  Target.Canvas.FillRect(Rect(0, 0, Width, Height));
  DrawSelf(Target.Canvas, Width, Height);
  FCacheDirty := False;
end;

{ ---- Обработка хитов ---- }

procedure TVfoOverlay.DoHit(HV: Integer);
var
  NewMode, NewBW: Integer;
begin
  // Кнопки бара
  case HV of
    HIT_BAR_MODE: begin SetPanel(fpMode); Exit; end;
    HIT_BAR_DSP:  begin SetPanel(fpDsp);  Exit; end;
    HIT_BAR_AUD:  begin SetPanel(fpAud);  Exit; end;
    HIT_MUTE:     begin FMuted := not FMuted; RequestInvalidate;
                        if Assigned(FOnMute) then FOnMute(Self); Exit; end;
    HIT_SPLIT:    begin if Assigned(FOnSplit) then FOnSplit(Self); Exit; end;
    HIT_TX:       begin if Assigned(FOnTxSelect) then FOnTxSelect(Self); Exit; end;
  end;

  // Устройство аудио
  if HV >= HIT_DEV_BASE then
  begin
    NewMode := HV - HIT_DEV_BASE;   // индекс в списке
    if (NewMode >= 0) and (NewMode < FDevNames.Count) then
    begin
      FCurDev := FDevNames[NewMode];
      FPanel := fpNone; Height := ComputeHeight;
      RequestInvalidate;
      if Assigned(FOnAudioDevice) then
        FOnAudioDevice(FDevIdx[NewMode], FDevNames[NewMode]);
    end;
    Exit;
  end;

  // AGC-режим
  if HV >= HIT_AGC_PICK_BASE then
  begin
    FAGCMode := HV - HIT_AGC_PICK_BASE;
    RequestInvalidate;
    if Assigned(FOnAGCChange) then FOnAGCChange(FAGCMode);
    Exit;
  end;

  // DSP-тумблеры (отрицательные HV — нельзя через set/in)
  if (HV = HIT_NR) or (HV = HIT_NB) or (HV = HIT_SNB) or (HV = HIT_ANF) then
  begin
    case HV of
      HIT_NR:  FNRMode := (FNRMode + 1) mod 5;
      HIT_NB:  FNBMode := (FNBMode + 1) mod 3;
      HIT_SNB: FSNBOn  := not FSNBOn;
      HIT_ANF: FANFOn  := not FANFOn;
    end;
    RequestInvalidate;
    if Assigned(FOnDSPChange) then FOnDSPChange(FNRMode, FNBMode, FSNBOn, FANFOn);
    Exit;
  end;

  // Режим
  if (HV < 0) and (HV >= -OVL_MODE_COUNT) then
  begin
    NewMode := (-HV) - 1;
    if NewMode <> FMode then
    begin
      FModeFilter[FMode] := FFilterBW;
      FMode := NewMode;
      FFilterBW := FModeFilter[FMode];
      Height := ComputeHeight;   // число фильтров могло смениться (FM=2)
      RequestInvalidate;
      if Assigned(FOnSelect) then FOnSelect(FMode, FFilterBW);
    end;
    Exit;
  end;

  // Фильтр (BW>0)
  if HV > 0 then
  begin
    NewBW := HV;
    if NewBW <> FFilterBW then
    begin
      FFilterBW := NewBW;
      FModeFilter[FMode] := FFilterBW;
      RequestInvalidate;
      if Assigned(FOnSelect) then FOnSelect(FMode, FFilterBW);
    end;
  end;
end;

procedure TVfoOverlay.ApplyVolFromX(LX: Integer);
var
  V: Integer;
begin
  if FVolTrack.Right <= FVolTrack.Left then Exit;
  V := Round((LX - FVolTrack.Left) / (FVolTrack.Right - FVolTrack.Left) * 100);
  if V < 0 then V := 0 else if V > 100 then V := 100;
  if V <> FVolume then
  begin
    FVolume := V;
    if FMuted then FMuted := False;
    RequestInvalidate;
    if Assigned(FOnVolume) then FOnVolume(FVolume);
  end;
end;

{ ---- Внешний ввод (маршрутизируется MainForm поверх спектра) ---- }

function TVfoOverlay.HandleMouseDown(Button: TMouseButton; X, Y: Integer): Boolean;
begin
  Result := False;
  if not Visible then Exit;
  if (X < Left) or (Y < Top) or (X >= Left + Width) or (Y >= Top + Height) then Exit;
  MouseDown(Button, [], X - Left, Y - Top);
  Result := True;
end;

function TVfoOverlay.HandleMouseMove(X, Y: Integer): Boolean;
var
  I, OldHot, LX, LY: Integer;
begin
  Result := False;
  if not Visible then Exit;
  LX := X - Left;  LY := Y - Top;
  if FVolDrag then
  begin
    ApplyVolFromX(LX);
    Result := True;
    Exit;
  end;
  OldHot := FHotIdx;
  FHotIdx := -1;
  if (LX >= 0) and (LY >= 0) and (LX < Width) and (LY < Height) then
    for I := 0 to FHitCount - 1 do
      if PtInRect(FHitRects[I], Point(LX, LY)) then
      begin FHotIdx := I; Break; end;
  if FHotIdx <> OldHot then
  begin
    RequestInvalidate;
    Result := True;
  end;
end;

function TVfoOverlay.HandleMouseUp(X, Y: Integer): Boolean;
begin
  Result := False;
  if not Visible then Exit;
  if FVolDrag then begin FVolDrag := False; Result := True; Exit; end;
  if (X >= Left) and (Y >= Top) and (X < Left + Width) and (Y < Top + Height) then
    Result := True;   // клик был по накладке — не пускаем его в спектр
end;

function TVfoOverlay.HandleMouseLeave: Boolean;
begin
  Result := False;
  FVolDrag := False;
  if FHotIdx >= 0 then
  begin
    FHotIdx := -1;
    RequestInvalidate;
    Result := True;
  end;
end;

procedure TVfoOverlay.MouseDown(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);
var
  I, HV: Integer;
begin
  inherited;
  if Button <> mbLeft then Exit;
  for I := 0 to FHitCount - 1 do
    if PtInRect(FHitRects[I], Point(X, Y)) then
    begin
      HV := FHitActions[I];
      if HV = HIT_VOL then
      begin
        FVolDrag := True;
        ApplyVolFromX(X);
      end
      else
        DoHit(HV);
      Break;
    end;
end;

procedure TVfoOverlay.MouseMove(Shift: TShiftState; X, Y: Integer);
var
  I, OldHot: Integer;
begin
  inherited;
  OldHot := FHotIdx; FHotIdx := -1;
  for I := 0 to FHitCount - 1 do
    if PtInRect(FHitRects[I], Point(X, Y)) then
    begin FHotIdx := I; Break; end;
  if FHotIdx <> OldHot then RequestInvalidate;
end;

procedure TVfoOverlay.MouseLeave;
begin
  inherited;
  if FHotIdx >= 0 then begin FHotIdx := -1; RequestInvalidate; end;
end;

{ ---- Обновление состояния из контроллера ---- }

procedure TVfoOverlay.SetState(AMode, ABW: Integer; AVfoHz, ASMeterDB: Double);
begin
  FMode     := Max(0, Min(OVL_MODE_COUNT - 1, AMode));
  FFilterBW := ABW;
  FModeFilter[FMode] := ABW;
  FVfoHz    := AVfoHz;
  FSMeterDB := ASMeterDB;
  Height    := ComputeHeight;
  RequestInvalidate;
end;

procedure TVfoOverlay.SetDSPState(ANRMode, ANBMode: Integer; ASNBOn, AANFOn: Boolean;
  AAGCMode: Integer);
begin
  FNRMode  := ANRMode;
  FNBMode  := ANBMode;
  FSNBOn   := ASNBOn;
  FANFOn   := AANFOn;
  FAGCMode := AAGCMode;
  RequestInvalidate;
end;

procedure TVfoOverlay.SetExtState(AVolume: Integer; AMuted, ASplit, ATx, ATxSel: Boolean);
begin
  if (AVolume = FVolume) and (AMuted = FMuted) and (ASplit = FSplit)
     and (ATx = FTx) and (ATxSel = FTxSel) then Exit;
  if not FVolDrag then FVolume := AVolume;   // во время drag ведём сами
  FMuted := AMuted;
  FSplit := ASplit;
  FTx    := ATx;
  FTxSel := ATxSel;
  RequestInvalidate;
end;

procedure TVfoOverlay.SetAudioDevices(Names: TStrings; const Indices: array of Integer;
  const CurName: string);
var
  I: Integer;
begin
  FDevNames.Assign(Names);
  SetLength(FDevIdx, FDevNames.Count);
  for I := 0 to FDevNames.Count - 1 do
    if I <= High(Indices) then FDevIdx[I] := Indices[I] else FDevIdx[I] := -1;
  FCurDev := CurName;
  if FPanel = fpAud then Height := ComputeHeight;
  RequestInvalidate;
end;

procedure TVfoOverlay.UpdateSMeter(DB: Double);
begin
  if Abs(DB - FSMeterDB) > 0.4 then
  begin
    FSMeterDB := DB;
    RequestInvalidate;
  end;
end;

procedure TVfoOverlay.UpdateVfo(AVfoHz: Double);
begin
  if FVfoHz <> AVfoHz then
  begin
    FVfoHz := AVfoHz;
    RequestInvalidate;
  end;
end;

end.