{*********************************************************}
{*                 VPCALENDAR.PAS 1.03                   *}
{*********************************************************}

{* ***** BEGIN LICENSE BLOCK *****                                            *}
{* Version: MPL 1.1                                                           *}
{*                                                                            *}
{* The contents of this file are subject to the Mozilla Public License        *}
{* Version 1.1 (the "License"); you may not use this file except in           *}
{* compliance with the License. You may obtain a copy of the License at       *}
{* http://www.mozilla.org/MPL/                                                *}
{*                                                                            *}
{* Software distributed under the License is distributed on an "AS IS" basis, *}
{* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License   *}
{* for the specific language governing rights and limitations under the       *}
{* License.                                                                   *}
{*                                                                            *}
{* The Original Code is TurboPower Visual PlanIt                              *}
{*                                                                            *}
{* The Initial Developer of the Original Code is TurboPower Software          *}
{*                                                                            *}
{* Portions created by TurboPower Software Inc. are Copyright (C) 2002        *}
{* TurboPower Software Inc. All Rights Reserved.                              *}
{*                                                                            *}
{* Contributor(s):                                                            *}
{*                                                                            *}
{* ***** END LICENSE BLOCK *****                                              *}

unit VpCalendar;    { Calendar component }

{$IF FPC_FullVersion >= 30200}
  {$WARN 6058 off : Call to subroutine "$1" marked as inline is not inlined}
{$IFEND}

{$I vp.inc}
                            
interface

uses
  {$IFDEF LCL}
  LMessages, LCLProc, LCLType, LCLIntf, FileUtil,
  {$ELSE}
  Windows, Messages,
  {$ENDIF}
  SysUtils, Types, Buttons, Classes, Controls, Forms, Graphics, Menus,
  VpConst, VpBase, VpSR, VpMisc, VpBaseDS, VpException;

type
  TVpCalDisplayOption = (cdoShortNames, cdoShowYear, cdoShowInactive,
                         cdoShowRevert, cdoShowToday, cdoShowNavBtns,
                         cdoHideActive, cdoHighlightSat, cdoHighlightSun,
                         cdoHighlightHolidays);

  TVpCalDisplayOptions = set of TVpCalDisplayOption;

  TVpCalColorArray = array[0..10] of TColor;

  TVpCalColorScheme = (cscalCustom, cscalClassic, cscalWindows,
                       cscalGold, cscalOcean, cscalRose);

  TVpCalSchemeArray = array[TVpCalColorScheme] of TVpCalColorArray;

  TRowArray = array[0..8] of Integer;
  TColArray = array[0..6] of Integer;

const
  {ActiveDay, DayNames, Days, InactiveDays, MonthAndYear, Weekend, EventDays, ActiveDayBorder, ActiveDayText}
  CalScheme : TVpCalSchemeArray = (
    // Active BG   DayNames      Days          Inact.Days    Month/Year    Weekend       Event         Background    Active border Active text   Holidays
    (0,            0,            0,            0,            0,            0,            0,            0,            0,            0,            0),
    (clWindow,     clWindowText, clWindowText, clSilver,     clWindowText, clRed,        clWindowText, clWindow,     clWindowText, clWindowText, clRed),  // classic
    (clBlue,       clMaroon,     clBlack,      clMedGray,    clBlue,       clRed,        clBlack,      clDefault,    clBlack,      clWhite,      clRed),       // windows
    (clMaroon,     clBlack,      clYellow,     clSilver,     clBlack,      $7777FF,      clWhite,      clOlive,      clBlack,      clYellow,     $7777FF),      // gold
    (clBlue,       clSilver,     clAqua,       clBlue,       clSilver,     clRed,        clWhite,      clNavy,       clNavy,       clWhite,      clRed),       // ocean
    ($007500EA,    clBlack,      clFuchsia,    clMedGray,    clBlack,      clRed,        clMaroon,     $00D9B3FF,    clMaroon,     clWhite,      clRed)        // rose
  );
  calDefWeekStarts = dtSunday;  { default start of the week }

type
  TVpCalColors = class(TPersistent)
  private
    FUpdating: Boolean;
    FOnChange: TNotifyEvent;
    SettingScheme: Boolean;
    function GetColor(Index: Integer): TColor;
    procedure SetColor(Index: Integer; Value: TColor);
    procedure SetColorScheme(Value: TVpCalColorScheme);
  protected
    procedure DoOnChange;
  public
    FCalColors: TVpCalColorArray;
    FColorScheme: TVpCalColorScheme;
    procedure Assign(Source: TPersistent); override;
    procedure BeginUpdate;
    procedure EndUpdate;
    property OnChange: TNotifyEvent read  FOnChange write FOnChange;
  published
    property ActiveDay: TColor index 0 read  GetColor write SetColor;
    property ActiveDayBorder: TColor index 8 read GetColor write SetColor;
    property ActiveDayText: TColor index 9 read GetColor write SetColor;
    property Background: TColor index 7 read GetColor write SetColor;
    property ColorScheme: TVpCalColorScheme read  FColorScheme write SetColorScheme;
    property DayNames: TColor index 1 read  GetColor write SetColor;
    property Days: TColor index 2 read  GetColor write SetColor;
    property InactiveDays: TColor index 3 read  GetColor write SetColor;
    property MonthAndYear: TColor index 4 read  GetColor write SetColor;
    property Weekend: TColor index 5 read  GetColor write SetColor;
    property EventDays: TColor index 6 read GetColor write SetColor;
    property Holidays: TColor index 10 read GetColor write SetColor;
  end;

type
  TDateChangeEvent = procedure(Sender: TObject; Date: TDateTime) of object;
  TCalendarDateEvent = procedure(Sender: TObject; ADate: TDateTime; const Rect: TRect) of object;
  TGetHighlightEvent = procedure(Sender: TObject; ADate: TDateTime; var Color: TColor) of object;
  TGetDateEnabledEvent = procedure(Sender: TObject; ADate: TDateTime; var Enabled: Boolean) of object;

  TVpCustomCalendar = class(TVpLinkableControl)
  private
    FDefaultPopup    : TPopupMenu;
    FExternalPopup: TPopupMenu;

  protected {private}
    {$IFNDEF LCL}
    FBorderStyle     : TBorderStyle;
    {$ENDIF}
    FBrowsing        : Boolean;
    FColors          : TVpCalColors;
    FOptions         : TVpCalDisplayOptions;
    FDate            : TDateTime;
    FDay             : Integer;               {calendar day}
    FDateFormat      : TVpDateFormat;
    FDayNameWidth    : TVpDayNameWidth;
    FDrawHeader      : Boolean;               {true to draw day name header}
    FMonth           : Integer;               {calendar month}
    FReadOnly        : Boolean;               {true if in read only mode}
    FWantDblClicks   : Boolean;               {true to include cs_dblclks style}
    FWeekStarts      : TVpDayType;            {the day that begins the week}
    FYear            : Integer;               {calendar year}
    FLastRenderX     : Integer;
    FLastRenderY     : Integer;

    {event variables}
    FOnChange        : TDateChangeEvent;
    FOnDrawDate      : TCalendarDateEvent;
    FOnDrawItem      : TCalendarDateEvent;
    FOnGetDateEnabled: TGetDateEnabledEvent;
    FOnGetHighlight  : TGetHighlightEvent;
    FOnHoliday       : TVpHolidayEvent;

    {internal variables}
    clInLinkHandler  : Boolean;
    clBtnLeft        : TSpeedButton;
    clBtnRevert      : TSpeedButton;
    clBtnRight       : TSpeedButton;
    clBtnToday       : TSpeedButton;
    clInPopup        : Boolean;
    clBtnNextYear    : TSpeedButton;
    clBtnPrevYear    : TSpeedButton;
    clCalendar       : array[1..49] of Byte; {current month grid}
    clDay            : Word;
    clFirst          : Byte; {index for first day in current month}
    clLast           : Byte; {index for last day in current month}
    clMonth          : Word;
    clRowCol         : array[0..8, 0..6] of TRect; {cell TRect info}
    cSettingScheme   : Boolean;
    clYear           : Word;
    clWidth          : Integer;   {client width - margins}
    clMask           : array[0..MaxDateLen] of AnsiChar; {default date mask}
    clPopup          : Boolean;   {true if being created as a popup}
    clRevertDate     : TDateTime; {date on entry}
    clRowCount       : Integer;   {7 if no header, otherwise 8}
    clStartRow       : Integer;   {first row number}
    calMargin        : Integer;

    {property methods}
    function GetDay: Integer;
    function GetMonth: Integer;
    function GetYear: Integer;
    {$IFNDEF LCL}
    procedure SetBorderStyle(Value: TBorderStyle); reintroduce;
    {$ENDIF}
    procedure SetColor(Value: TColor); override;
    procedure SetDate(Value: TDateTime);
    procedure SetDateFormat(Value: TVpDateFormat);
    procedure SetDayNameWidth(Value: TVpDayNameWidth);
    procedure SetDisplayOptions(Value: TVpCalDisplayOptions);
    procedure SetDrawHeader(Value: Boolean);
    procedure SetWantDblClicks(Value: Boolean);
    procedure SetWeekStarts(Value: TVpDayType);

    { Popup menu }
    function GetPopupMenu: TPopupMenu; override;
    procedure InitializeDefaultPopup;
    procedure SetPopupMenu(AValue: TPopupMenu);
    procedure PopupToday(Sender: TObject);
    procedure PopupNextMonth(Sender: TObject);
    procedure PopupPrevMonth(Sender: TObject);
    procedure PopupNextYear(Sender: TObject);
    procedure PopupPrevYear(Sender: TObject);

    {internal methods}
    procedure calChangeMonth(Sender: TObject);
    procedure calColorChange(Sender: TObject);
    function calGetCurrentRectangle: TRect;
      {-get bounding rectangle for the current calendar day}
    function calGetValidDate(ADate: TDateTime; Delta: Integer): TDateTime;
    procedure calRebuildCalArray(ADate: TDateTime);
      {-recalculate the contents of the calendar array}
    procedure CalculateSizes(WorkCanvas: TCanvas; Angle: TVpRotationAngle;
      Rect: TRect; out Row: TRowArray; out Col: TColArray; DisplayOnly: Boolean);
    procedure calRecalcSize (DisplayOnly: Boolean);
      {-calcualte new sizes for rows and columns}
    class function GetControlClassDefaultSize: TSize; override;
    procedure Hookup;

    {VCL control methods}
    procedure CMEnter(var Msg: {$IFDEF DELPHI}TMessage{$ELSE}TLMessage{$ENDIF}); message CM_ENTER;
    procedure CMExit(var Msg: {$IFDEF DELPHI}TMessage{$ELSE}TLMessage{$ENDIF}); message CM_EXIT;
    procedure CMFontChanged(var Msg: {$IFDEF DELPHI}TMessage{$ELSE}TLMessage{$ENDIF}); message CM_FONTCHANGED;

    {windows message methods}
    {$IFDEF DELPHI}
    procedure WMEraseBkgnd(var Msg: TWMEraseBkgnd); message WM_ERASEBKGND;
    procedure WMGetDlgCode(var Msg: TWMGetDlgCode); message WM_GETDLGCODE;
    procedure WMKillFocus(var Msg: TWMKillFocus); message WM_KILLFOCUS;
    {$ELSE}
    procedure WMEraseBkgnd(var Msg: TLMEraseBkgnd); message LM_ERASEBKGND;
//    procedure WMGetDlgCode(var Msg: TLMGetDlgCode); message LM_GETDLGCODE;
    procedure WMKillFocus(var Msg: TLMKillFocus); message LM_KILLFOCUS;
    {$ENDIF}

    procedure calBtnClick(Sender: TObject);
    procedure CreateParams(var Params: TCreateParams); override;
    procedure CreateWnd; override;
    procedure DoOnChange(Value: TDateTime); dynamic;
    function DoOnGetDateEnabled(ADate: TDateTime): Boolean; dynamic;
   {$IFDEF LCL}
    function DoMouseWheel(Shift: TShiftState; Delta: Integer; MousePos: TPoint): Boolean; override;
   {$ELSE}
    procedure DoOnMouseWheel(Shift: TShiftState; Delta, XPos, YPos: SmallInt); override;
   {$ENDIF}
    function IsReadOnly: Boolean; dynamic;
      {-return true if the calendar is in read-only mode}
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
    procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer); override;
    procedure Paint; override;

  public
    constructor Create(AOwner: TComponent); override;
    constructor CreateEx(AOwner: TComponent; AsPopup: Boolean); virtual;
    destructor Destroy; override;
    procedure LoadLanguage;

    procedure SetBounds(ALeft, ATop, AWidth, AHeight: Integer); override;

    function GetControlType: TVpItemType; override;

    procedure IncDay(Delta: Integer);
    procedure IncMonth(Delta: Integer);
    procedure IncYear(Delta: Integer);
    function IsHoliday(ADate: TDate; out AHolidayName: String): Boolean;

    procedure PaintToCanvas(ACanvas: TCanvas; ARect: TRect;
      Angle: TVpRotationAngle; ADate: TDateTime);
    procedure RenderToCanvas(RenderCanvas: TCanvas; RenderIn: TRect;
      Angle: TVpRotationAngle; Scale: Extended; RenderDate: TDateTime;
      StartLine: Integer; StopLine: Integer; UseGran: TVpGranularity;
      DisplayOnly: Boolean); override;
    procedure SetToday;

    { LinkHandler is the method which is called by the ControlLink component,  }
    { it is used to synchronize the calendar's date with other Visual PlanIt   }
    { controls do not call the LinkHandler procedure programatically.          }
    procedure LinkHandler(Sender: TComponent; NotificationType: TVpNotificationType;
      const Value: Variant); override;

    property Browsing : Boolean read FBrowsing;
    property Canvas;
    property CurrentRectangle: TRect read calGetCurrentRectangle;
    property Day: Integer read GetDay;
    property Month: Integer read GetMonth;
    property Year: Integer read GetYear;

    {properties}
    property Align;
    property Anchors;
   {$IFDEF LCL}
    property BorderSpacing;
   {$ENDIF}
    property BorderStyle default bsNone; //: TBorderStyle read FBorderStyle write SetBorderStyle default bsNone;
    property Color;
    property Colors: TVpCalColors read FColors write FColors;
    property Date: TDateTime read FDate write SetDate;
    property DateFormat: TVpDateFormat read FDateFormat write SetDateFormat default dfLong;
    property DayNameWidth: TVpDayNameWidth read FDayNameWidth write SetDayNameWidth default 3;
    property Options: TVpCalDisplayOptions read FOptions write SetDisplayOptions 
      default [cdoHighlightSat, cdoHighlightSun, cdoShortNames, cdoShowNavBtns, cdoShowRevert, cdoShowToday, cdoShowYear];
    property ReadOnly: Boolean read FReadOnly write FReadOnly default false;
    property WantDblClicks: Boolean read FWantDblClicks write SetWantDblClicks default true;
    property WeekStarts: TVpDayType read FWeekStarts write SetWeekStarts default dtSunday;

    {events}
    property OnChange: TDateChangeEvent read  FOnChange write FOnChange;
    property OnDrawDate: TCalendarDateEvent read FOnDrawDate write FOnDrawDate;
    property OnDrawItem: TCalendarDateEvent read FOnDrawItem write FOnDrawItem;
    property OnGetDateEnabled: TGetDateEnabledEvent read FOnGetDateEnabled write FOnGetDateEnabled;
    property OnGetHighlight: TGetHighlightEvent read FOnGetHighlight write FOnGetHighlight;
    property OnHoliday: TVpHolidayEvent read FOnHoliday write FOnHoliday;
  end;

  TVpCalendar = class(TVpCustomCalendar)
  published
    {properties}
    {$IFDEF VERSION4}
    property Anchors;
    property Constraints;
    property DragKind;
    {$ENDIF}
    property Align;
    {$IFDEF LCL}
    property BorderSpacing;
    {$ENDIF}
    property BorderStyle;
    property Color;
    property Colors;
    property Cursor;
    property DateFormat;
    property DayNameWidth;
    property DragCursor;
    property DragMode;
    property Enabled;
    property Font;
    property Options;
    property ParentFont;
    property ParentShowHint;
    property PopupMenu;
    property ReadOnly;
    property ShowHint;
    property TabOrder;
    property TabStop;
    property Visible;
    property WantDblClicks;
    property WeekStarts;
    {events}
    property AfterEnter;
    property AfterExit;
    property OnChange;
    property OnClick;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnDrawDate;
    property OnDrawItem;
    property OnEndDrag;
    property OnEnter;
    property OnExit;
    property OnGetDateEnabled;
    property OnGetHighlight;
    property OnHoliday;
    property OnKeyDown;
    property OnKeyPress;
    property OnKeyUp;
    property OnMouseDown;
    property OnMouseMove;
    property OnMouseUp;
    property OnStartDrag;
  end;

implementation

uses
 {$IFDEF LCL}
  DateUtils,
 {$ENDIF}
  VpCalendarPainter;

const
  CAL_MARGIN = 4; {left, right, and top margin}

function SumOf(const A: array of Integer; First, Last: Integer): Integer;
var
  I : Integer;
begin
  Result := 0;
  for I := First to Last do
    Result := Result  + A[I];
end;

{*** TVpCalColors ***}
procedure TVpCalColors.Assign(Source: TPersistent);
begin
  if Source is TVpCalColors then begin
    FCalColors := TVpCalColors(Source).FCalColors;
    FColorScheme := TVpCalColors(Source).FColorScheme;
    FOnChange := TVpCalColors(Source).FOnChange;
  end else
    inherited Assign(Source);
end;

procedure TVpCalColors.BeginUpdate;
begin
  FUpdating := True;
end;

procedure TVpCalColors.EndUpdate;
begin
  FUpdating := False;
  DoOnChange;
end;

procedure TVpCalColors.DoOnChange;
begin
  if not FUpdating and Assigned(FOnChange) then
    FOnChange(Self);

  if not SettingScheme then
    FColorScheme := cscalCustom;
end;

function TVpCalColors.GetColor(Index: Integer) : TColor;
begin
  Result := FCalColors[Index];
end;

procedure TVpCalColors.SetColor(Index: Integer; Value: TColor);
begin
  if Value <> FCalColors[Index] then begin
    FCalColors[Index] := Value;
    DoOnChange;
  end;
end;

procedure TVpCalColors.SetColorScheme(Value: TVpCalColorScheme);
begin
  if Value <> FColorScheme then begin
    SettingScheme := True;
    try
      FColorScheme := Value;
      if Value <> cscalCustom then begin
        FCalColors := CalScheme[Value];
        DoOnChange;
      end;
    finally
      SettingScheme := False;
    end;
  end;
end;


(******************************************************************************)
{   TVpCustomCalendar                                                          }
(******************************************************************************)
constructor TVpCustomCalendar.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);

  {$IFDEF LCL}
  ControlStyle := ControlStyle + [csClickEvents] - [csCaptureMouse];
  {$ELSE}
  ControlStyle := ControlStyle + [csClickEvents, csFramed] - [csCaptureMouse];
  {$ENDIF}

//  Height := 140;
  TabStop := True;
//  Width := 200;

  calMargin := ScaleX(CAL_MARGIN, DesignTimeDPI);

 {$IFNDEF LCL}
  Font.Name := 'MS Sans Serif';
  Font.Size := 8;
 {$ENDIF}

  BorderStyle := bsNone;
  FDayNameWidth := 3;
  FDateFormat := dfLong;
  FOptions := [cdoShortNames, cdoShowYear, cdoShowRevert, cdoShowToday,
               cdoShowNavBtns, cdoHighlightSun, cdoHighlightSat];
  FWantDblClicks := True;
  FWeekStarts := dtSunday;
  FLastRenderX := 0;
  FLastRenderY := 0;

  clInLinkHandler := false;

  {create navigation buttons}
  clBtnLeft := TSpeedButton.Create(Self);
  clBtnLeft.Parent := Self;
  {$IFDEF NEW_ICONS}
  LoadGlyphFromRCDATA(clBtnLeft.Glyph, 'VpLArrow', 16, 24, 32);
  {$ELSE}
  clBtnLeft.Glyph.LoadFromResourceName(HINSTANCE,'VPLEFTARROW'); //soner geändert: clBtnLeft.Glyph.Handle := LoadBaseBitmap('VPLEFTARROW');
  {$ENDIF}
  clBtnLeft.OnClick := calBtnClick;
  clBtnLeft.Hint := RSPrevMonth;
  clBtnLeft.ShowHint := True;

  clBtnRight := TSpeedButton.Create(Self);
  clBtnRight.Parent := Self;
  {$IFDEF NEW_ICONS}
  LoadGlyphFromRCDATA(clBtnRight.Glyph, 'VpRArrow', 16, 24, 32);
  {$ELSE}
  clBtnRight.Glyph.LoadFromResourceName(HINSTANCE,'VPRIGHTARROW'); //soner geändert: clBtnRight.Glyph.Handle := LoadBaseBitmap('VPRIGHTARROW');
  {$ENDIF}
  clBtnRight.OnClick := calBtnClick;
  clBtnRight.Hint := RSNextMonth;
  clBtnRight.ShowHint := True;

  clBtnNextYear := TSpeedButton.Create(Self);
  clBtnNextYear.Parent := Self;
  {$IFDEF NEW_ICONS}
  LoadGlyphFromRCDATA(clBtnNextYear.Glyph, 'VpRArrows', 16, 24, 32);
  {$ELSE}
  clBtnNextYear.Glyph.LoadFromResourceName(HINSTANCE,'VPRIGHTARROWS'); //soner geöndert: clBtnNextYear.Glyph.Handle := LoadBaseBitmap('VPRIGHTARROWS');
  {$ENDIF}
  clBtnNextYear.OnClick := calBtnClick;
  clBtnNextYear.Hint := RSNextYear;
  clBtnNextYear.ShowHint := True;

  clBtnPrevYear := TSpeedButton.Create(Self);
  clBtnPrevYear.Parent := Self;
  {$IFDEF NEW_ICONS}
  LoadGlyphFromRCData(clBtnPrevYear.Glyph, 'VpLArrows', 16, 24, 32);
  {$ELSE}
  clBtnPrevYear.Glyph.LoadFromResourceName(HINSTANCE,'VPLEFTARROWS'); //soner geöndert: clBtnPrevYear.Glyph.Handle := LoadBaseBitmap('VPLEFTARROWS');
  {$ENDIF}
  clBtnPrevYear.OnClick := calBtnClick;
  clBtnPrevYear.Hint := RSPrevYear;
  clBtnPrevYear.ShowHint := True;

  {create "revert" button}
  clBtnRevert := TSpeedButton.Create(Self);
  clBtnRevert.Parent := Self;
  {$IFDEF NEW_ICONS}
  LoadGlyphFromRCData(clBtnRevert.Glyph, 'VpRevert', 16, 24, 32);
  {$ELSE}
  clBtnRevert.Glyph.LoadFromResourceName(HINSTANCE,'VPREVERT'); //soner geändert: clBtnRevert.Glyph.Handle := LoadBaseBitmap('VPREVERT');
  {$ENDIF}
  clBtnRevert.OnClick := calBtnClick;
  clBtnRevert.Hint := RSCalendarRevert;
  clBtnRevert.ShowHint := True;

  {create "today" button}
  clBtnToday := TSpeedButton.Create(Self);
  clBtnToday.Parent := Self;
  {$IFDEF NEW_ICONS}
  LoadGlyphFromRCData(clBtnToday.Glyph, 'VpToday', 16, 24, 32);
  {$ELSE}
  clBtnToday.Glyph.LoadFromResourceName(HINSTANCE,'VPTODAY'); //soner geändert: clBtnToday.Glyph.Handle := LoadBaseBitmap('VPTODAY');
  {$ENDIF}
  clBtnToday.OnClick := calBtnClick;
  clBtnToday.Hint := RSToday;
  clBtnToday.ShowHint := True;

  // Assign default color scheme
  FColors := TVpCalColors.Create;
  FColors.OnChange := calColorChange;
  FColors.FCalColors := CalScheme[cscalWindows];

  // Assign default international support object
  FDrawHeader := True;
  clRowCount := 8;
  clStartRow := 0;

  // Popup menu
  FDefaultPopup := TPopupMenu.Create(Self);
  FDefaultPopup.Name := 'default';
  InitializeDefaultPopup;
  Self.PopupMenu := FDefaultPopup;

  // Initial size of the control
  with GetControlClassDefaultSize do
    SetInitialBounds(0, 0, CX, CY);

  Hookup;
end;

constructor TVpCustomCalendar.CreateEx(AOwner: TComponent; AsPopup: Boolean);
begin
  clPopup := AsPopup;
  Create(AOwner);
end;

destructor TVpCustomCalendar.Destroy;
begin
  FColors.Free;
  FColors := nil;

  FDefaultPopup.Free;

  inherited Destroy;
end;

procedure TVpCustomCalendar.calBtnClick(Sender: TObject);
var
  Key: Word;
begin
  SetFocus;
  Key := 0;

  if Sender = clBtnLeft then begin
    Key := VK_PRIOR;
    KeyDown(Key, []);
  end else if Sender = clBtnRevert then begin
    Key := VK_ESCAPE;
    KeyDown(Key, []);
  end else if Sender = clBtnRight then begin
    Key := VK_NEXT;
    KeyDown(Key, []);
  end else if Sender = clBtnToday then begin
    Key := VK_BACK;
    KeyDown(Key, [ssAlt]);
  end else if Sender = clBtnNextYear then begin
    Key := VK_NEXT;
    KeyDown(Key, [ssCtrl]);
  end else if Sender = clBtnPrevYear then begin
    Key := VK_PRIOR;
    KeyDown(Key, [ssCtrl]);
  end;
end;

procedure TVpCustomCalendar.calChangeMonth(Sender: TObject);
var
  Y, M, D: Word;
  MO: Integer;
  MI: TMenuItem;
begin
  MI := (Sender as TMenuItem);
  DecodeDate(FDate, Y, M, D);
  MO := MI.Tag;
  {set month and year}
  if (MO > M) and (MI.HelpContext < 3) then
    Dec(Y)
  else if (MO < M) and (MI.HelpContext > 3) then
    Inc(Y);
  M := M + MO;
  {set day}
  if D > DaysInAMonth(Y, MO) then
    D := DaysInAMonth(Y, MO);
  SetDate(calGetValidDate(EncodeDate(Y, MO, D)-1, +1));
  if (Assigned(FOnChange)) then
    FOnChange(Self, FDate);
end;
{=====}

procedure TVpCustomCalendar.calColorChange(Sender: TObject);
begin
  Invalidate;
end;

{ Get bounding rectangle for the current date}
function TVpCustomCalendar.calGetCurrentRectangle: TRect;
var
  Idx : Integer;
  R, C: Integer;
begin
  // Index into the month grid
  Idx := clFirst + Pred(clDay) + 13;
  R := (Idx div 7);
  C := (Idx mod 7);
  Result := clRowCol[R,C];
end;

function TVpCustomCalendar.calGetValidDate(ADate: TDateTime;
  Delta: Integer): TDateTime;
var
  I, X: Integer;
  Valid: Boolean;
  Fwd: Boolean;
begin
  Valid := false;
  Fwd := false;
  X := Delta;
  I := 1;
  while not Valid and (I < 1000) do begin
    {If the date is valid then yay!}
    if (DoOnGetDateEnabled(ADate + (X * I))) then begin
      Valid := true;
      Fwd := True;
    end
    {otherwise check the other direction}
    else if (DoOnGetDateEnabled(ADate - (X * I))) then begin
      valid := true;
    end
    else Inc(I);
  end;
  if Valid then
    if Fwd then Result := ADate + (X * I)
    else Result := ADate - (X * I)
  else
    raise(EVpCalendarError.Create(RSInvalidDate));
end;

procedure TVpCustomCalendar.calRebuildCalArray(ADate: TDateTime);
var
  Day1: TVpDayType;
  I, J: Integer;
begin
  HandleNeeded;
  DecodeDate(ADate, clYear, clMonth, clDay);

  {get the first day of the current month and year}
  Day1 := TVpDayType(SysUtils.DayOfWeek(EncodeDate(clYear, clMonth, 1)) -1);

  {find its index}
  I := Byte(Day1) - Byte(WeekStarts) + 1;
  if I < 1 then
    Inc(I, 7);
  clFirst := I;

  {find the index of the last day in the month}
  clLast := clFirst + DaysInAMonth(clYear, clMonth) {%H-}- 1;

  {initialize the first part of the calendar}
  if clMonth = 1 then
    J := DaysInAMonth(clYear - 1, 12)
  else
    J := DaysInAMonth(clYear, clMonth-1);
  for I := clFirst-1 downto 1 do begin
    clCalendar[I] := J;
    Dec(J);
  end;

  {initialize the rest of the calendar}
  J := 1;
  for I := clFirst to 49 do begin
    clCalendar[I] := J;
    if I = clLast then
      J := 1
    else
      Inc(J);
  end;
end;

procedure TVpCustomCalendar.CalculateSizes(WorkCanvas: TCanvas;
  Angle: TVpRotationAngle; Rect: TRect; out Row: TRowArray; out Col: TColArray;
  DisplayOnly: Boolean);
  {-calcualte new sizes for rows and columns}
var
  R: Integer;
  C: Integer;
  D1: Integer;
  D2: Integer;
  CH: Integer;
  RH: Integer;
  LR: Integer;

begin
  if (Angle = ra90) or (Angle = ra270) then
    clWidth := Rect.Bottom - Rect.Top - 2*calMargin
  else
    clWidth := Rect.Right - Rect.Left - 2*calMargin;

  {store row and column sizes}
  for C := 0 to 6 do
    Col[C] := clWidth div 7;

  if (FDrawHeader) then begin
    {button and date row}
    Row[0] := Round(1.4 * WorkCanvas.TextHeight('Yy'));
    {day name row}
    Row[1] := Round(1.5 * WorkCanvas.TextHeight('Yy'))
  end else begin
    {button and date row}
    Row[0] := Round(1.3 * WorkCanvas.TextHeight('Yy'));
    {day name row}
    Row[1] := 0;
  end;

  if (Angle = ra90) or (Angle = ra270) then
    CH := Rect.Right - Rect.Left - 2*calMargin - Row[0] - Row[1]
  else
    CH := Rect.Bottom - Rect.Top - 2*calMargin - Row[0] - Row[1];
  if ((not (cdoShowRevert in Options)) and (not (cdoShowToday in Options))) or
     DisplayOnly
  then
    LR := 7
  else
    LR := 8;

  RH := CH div (LR - 1);

  for R := 2 to 8 do
    Row[R] := RH;

  {distribute any odd horizontal space equally among the columns}
  for C := 0 to clWidth mod 7 do
    Inc(Col[C]);

  {distribute odd vertical space to top 2 rows}
  D1 := 0;
  for R := 0 to LR do
    D1 := D1 + Row[R];
  if (Angle = ra90) or (Angle = ra270) then
    D1 := Rect.Right - Rect.Left - D1 - 2*calMargin
  else
    D1 := Rect.Bottom - Rect.Top - D1 - 2*calMargin;
  D2 := D1 div 2;
  D1 := D1 - D2;
  Row[0] := Row[0] + D1;
  if (FDrawHeader) then
    Row[1] := Row[1] + D2;

  {initialize each cells TRect structure using}
  {the row heights from the Row[] array and the}
  {column widths from the Col[] array}
  for R := clStartRow to 7 do begin
    for C := 0 to 6 do begin
      clRowCol[R, C].Left := SumOf(Col, 0, C-1) + calMargin;
      clRowCol[R, C].Right := SumOf(Col, 0, C) + calMargin;
      clRowCol[R, C].Top := SumOf(Row, 0, R-1) + calMargin;
      clRowCol[R, C].Bottom := SumOf(Row, 0, R) + calMargin;
    end;
  end;
end;

{ Calculate new sizes for rows and columns }
procedure TVpCustomCalendar.calRecalcSize(DisplayOnly: Boolean);
var
  Row: TRowArray;
  Col: TColArray;

begin
  if not HandleAllocated then
    Exit;

  {clear row/col position structure}
  FillChar(clRowCol, SizeOf(clRowCol), #0);

  {set the way the buttons should look}
  clBtnLeft.Flat     := {not Ctl3D and} not clPopup;
  clBtnRevert.Flat   := {not Ctl3D and} not clPopup;
  clBtnRight.Flat    := {not Ctl3D and} not clPopup;
  clBtnToday.Flat    := {not Ctl3D and} not clPopup;
  clBtnNextYear.Flat := {not Ctl3D and} not clPopup;
  clBtnPrevYear.Flat := {not Ctl3D and} not clPopup;

  clBtnRevert.Visible := cdoShowRevert in FOptions;
  clBtnToday.Visible := cdoShowToday in FOptions;
  clBtnLeft.Visible := (cdoShowNavBtns in FOptions);
  clBtnRight.Visible := (cdoShowNavBtns in FOptions);
  clBtnNextYear.Visible := (cdoShowNavBtns in FOptions);
  clBtnPrevYear.Visible := (cdoShowNavBtns in FOptions);

  CalculateSizes(Canvas, ra0, Rect (0, 0, Width, Height), Row, Col, DisplayOnly);

  {position and size the left and right month buttons}
  {position and size the next and prev year buttons}
  clBtnNextYear.Height := Row[0] - calMargin;
  clBtnNextYear.Width := Col[1] - calMargin;
  if clBtnNextYear.Width < clBtnNextYear.Glyph.Width + 3 then
    clBtnNextYear.Width := clBtnNextYear.Glyph.Width + 3;
  clBtnNextYear.Top := calMargin;
  clBtnNextYear.Left := ClientWidth - calMargin - clBtnNextYear.Width;

  clBtnPrevYear.Height := Row[0] - calMargin;
  clBtnPrevYear.Width := Col[5] - calMargin;
  if clBtnPrevYear.Width < clBtnPrevYear.Glyph.Width + 3 then
    clBtnPrevYear.Width := clBtnPrevYear.Glyph.Width + 3;
  clBtnPrevYear.Top := calMargin;
  clBtnPrevYear.Left := calMargin;

  clBtnLeft.Height := Row[0] - calMargin;
  clBtnLeft.Width := Col[0] - calMargin;
  if clBtnLeft.Width < clBtnLeft.Glyph.Width + 3 then
    clBtnLeft.Width := clBtnLeft.Glyph.Width + 3;
  clBtnLeft.Top := calMargin;
  clBtnLeft.Left := clBtnPrevYear.Left + clBtnPrevYear.Width;

  clBtnRight.Height := Row[0] - calMargin;
  clBtnRight.Width := Col[6] - calMargin;
  if clBtnRight.Width < clBtnRight.Glyph.Width + 3 then
    clBtnRight.Width := clBtnRight.Glyph.Width + 3;
  clBtnRight.Top := calMargin;
  clBtnRight.Left := clBtnNextYear.Left - clBtnRight.Width;

  {position and size "today" button}
  clBtnToday.Height := Row[8];
  clBtnToday.Width := Col[5] + Col[6] - calMargin;
  clBtnToday.Top := ClientHeight - calMargin - clBtnToday.Height + 1;
  clBtnToday.Left := ClientWidth - calMargin - clBtnToday.Width;

  {position and size "revert" button}
  clBtnRevert.Height := Row[8];
  clBtnRevert.Width := Col[5] + Col[6] - calMargin;
  clBtnRevert.Top := ClientHeight - calMargin - clBtnRevert.Height + 1;
  clBtnRevert.Left := clBtnToday.Left - clBtnRevert.Width - calMargin;
end;

procedure TVpCustomCalendar.CMEnter(var Msg: {$IFDEF DELPHI}TMessage{$ELSE}TLMessage{$ENDIF});
var
  R : TRect;
begin
  inherited;

  clRevertDate := FDate;

  {invalidate the active date to ensure that the focus rect is painted}
  R := calGetCurrentRectangle;
  InvalidateRect(Handle, @R, False);
end;

procedure TVpCustomCalendar.CMExit(var Msg: {$IFDEF DELPHI}TMessage{$ELSE}TLMessage{$ENDIF});
var
  R : TRect;
begin
  inherited;

  {invalidate the active date to ensure that the focus rect is painted}
  R := calGetCurrentRectangle;
  InvalidateRect(Handle, @R, False);
end;
{=====}

procedure TVpCustomCalendar.CMFontChanged(var Msg: {$IFDEF DELPHI}TMessage{$ELSE}TLMessage{$ENDIF});
begin
  inherited;

  if csLoading in ComponentState then
    Exit;

  calRecalcSize(False);
  Invalidate;
end;


procedure TVpCustomCalendar.CreateParams(var Params: TCreateParams);
{$IFNDEF LCL}
const
  BorderStyles: array[TBorderStyle] of LongInt = (0, WS_BORDER);
{$ENDIF}
begin
  inherited CreateParams(Params);
{$IFNDEF LCL}
  with Params do begin
    Style := LongInt(Style) or BorderStyles[FBorderStyle];
    if clPopup then begin
      WindowClass.Style := WindowClass.Style or CS_SAVEBITS;
    end;
  end;
{$ENDIF}
  if NewStyleControls and ({Ctl3D or }clPopup) and (BorderStyle = bsSingle) then begin
    if not clPopup then
      Params.Style := Params.Style and not WS_BORDER;
    Params.ExStyle := Params.ExStyle or WS_EX_CLIENTEDGE;
  end;

  {set style to reflect desire for double clicks}
  if FWantDblClicks then
    ControlStyle := ControlStyle + [csDoubleClicks]
  else
    ControlStyle := ControlStyle - [csDoubleClicks];
end;
{=====}

procedure TVpCustomCalendar.CreateWnd;
begin
  inherited CreateWnd;

  calRecalcSize(False);

  {if not set, get current date}
  if FDate = 0 then
    SetDate(calGetValidDate(SysUtils.Date-1, +1));
end;

procedure TVpCustomCalendar.DoOnChange(Value: TDateTime);
begin
  if Assigned(FOnChange) then
    FOnChange(Self, Value);
end;
{=====}

function TVpCustomCalendar.DoOnGetDateEnabled(ADate: TDateTime) : Boolean;
begin
  Result := True;
  if Assigned(FOnGetDateEnabled) then
    FOnGetDateEnabled(Self, ADate, Result);
end;
{=====}

{$IFDEF LCL}
function TVpCustomCalendar.DoMouseWheel(Shift: TShiftState;
  Delta: Integer; MousePos: TPoint): Boolean;
{$ELSE}
procedure TVpCustomCalendar.DoMouseWheel(Shift: TShiftState;
  Delta, XPos, YPos: SmallInt);
{$ENDIF}
const
  WHEEL_DELTA = 120;  // in unit Windows.
var
  key: Word;
begin
 {$IFDEF LCL}
  Result := inherited DoMouseWheel(Shift, Delta, MousePos);
 {$ELSE}
  inherited DoOnMouseWheel(Shift, Delta, XPos, YPos);
 {$ENDIF}
  if Abs(Delta) = WHEEL_DELTA then begin
    {inc/dec month}
    if Delta < 0 then
      Key := VK_NEXT
    else
      Key := VK_PRIOR;
    KeyDown(Key, []);
  end else if Abs(Delta) > WHEEL_DELTA then begin
    {inc/dec year}
    if Delta < 0 then
      Key := VK_NEXT
    else
      Key := VK_PRIOR;
    KeyDown(Key, [ssCtrl]);
  end else if Abs(Delta) < WHEEL_DELTA then begin
    {inc/dec Week}
    if Delta < 0 then
      Key := VK_DOWN
    else
      Key := VK_UP;
    KeyDown(Key, []);
  end;
end;

function TVpCustomCalendar.IsReadOnly: Boolean;
begin
  Result := ReadOnly;
end;

class function TVpCustomCalendar.GetControlClassDefaultSize: TSize;
begin
  Result.CX := 200;
  Result.CY := 180;
end;

{ If the component is being dropped on a form at designtime, then
  automatically hook up to the first datastore component found. }
procedure TVpCustomCalendar.HookUp;
var
  I: Integer;
begin
  if csDesigning in ComponentState then
    for I := 0 to pred(Owner.ComponentCount) do begin
      if (Owner.Components[I] is TVpCustomDataStore) then begin
        DataStore := TVpCustomDataStore(Owner.Components[I]);
        Exit;
      end;
    end;
end;

procedure TVpCustomCalendar.KeyDown(var Key: Word; Shift: TShiftState);
var
  Y: Word;
  M: Word;
  D: Word;
  HD: TDateTime;
  PopupPoint: TPoint;

begin
//  inherited KeyDown(Key, Shift);

  if IsReadOnly then
    Exit;

  HD := FDate;
  case Key of
    VK_LEFT:
      if Shift = [] then
        SetDate(calGetValidDate(FDate, -1))
      else if ssCtrl in Shift then
        IncMonth(-1)
      else if ssShift in Shift then
        IncYear(-1);

    VK_RIGHT:
      if Shift = [] then
        SetDate(calGetValidDate(FDate, +1))
      else if ssCtrl in Shift then
        IncMonth(1)
      else if ssShift in Shift then
        IncYear(1);

    VK_UP:
      if Shift = [] then
        SetDate(calGetValidDate(FDate, -7))
      else if ssCtrl in Shift then
        IncYear(-1)
      else if ssShift in Shift then
        IncMonth(-1);

    VK_DOWN:
      if Shift = [] then
        SetDate(calGetValidDate(FDate, +7))
      else if ssCtrl in Shift then
        IncYear(1)
      else if ssShift in Shift then
        IncMonth(1);

    VK_HOME:
      if ssCtrl in Shift then begin
        DecodeDate(FDate, Y, M, D);
        SetDate(calGetValidDate(EncodeDate(Y, 1, 1)-1, +1));
      end else if Shift = [] then begin
        DecodeDate(FDate, Y, M, D);
        SetDate(calGetValidDate(EncodeDate(Y, M, 1)-1, +1));
      end;

    VK_END:
      if ssCtrl in Shift then begin
        DecodeDate(FDate, Y, M, D);
        SetDate(calGetValidDate(EncodeDate(Y, 12, DaysInAMonth(Y, 12))+1, -1));
      end else if Shift = [] then begin
        DecodeDate(FDate, Y, M, D);
        SetDate(calGetValidDate(EncodeDate(Y, M, DaysInAMonth(Y, M))+1, -1));
      end;

    VK_PRIOR:
      if ssCtrl in Shift then begin
        IncYear(-1);
      end else if Shift = [] then begin
        IncMonth(-1);
      end;

    VK_NEXT:
      if ssCtrl in Shift then begin
        IncYear(1);
      end else if Shift = [] then begin
        IncMonth(1);
      end;

    VK_BACK:
      if ssAlt in Shift then
        SetDate(calGetValidDate(SysUtils.Date-1, +1));

    VK_ESCAPE:
      if Shift = [] then
        SetDate(calGetValidDate(clRevertDate-1, +1));

    VK_F10:
      if (ssShift in Shift) and not (Assigned (PopupMenu)) then begin
        PopupPoint := GetClientOrigin;
        FDefaultPopup.Popup (PopupPoint.x + 10, PopupPoint.y + 10);
      end;

    VK_APPS:
      if not Assigned (PopupMenu) then begin
        PopupPoint := GetClientOrigin;
        FDefaultPopup.Popup (PopupPoint.x + 10, PopupPoint.y + 10);
      end;

    else
      inherited;
  end;

  Key := 0;

  if HD <> FDate then begin
      FBrowsing := True;
    try
      DoOnChange(FDate);
    finally
      FBrowsing := False;
    end;
  end;
end;
{=====}

procedure TVpCustomCalendar.KeyPress(var Key: Char);
begin
  inherited KeyPress(Key);

  if IsReadOnly then
    Exit;

  case Key of
    '+' : SetDate(calGetValidDate(FDate, +1));
    '-' : SetDate(calGetValidDate(FDate, -1));
    #13 : DoOnChange(FDate);       {date selected}
    #32 : DoOnChange(FDate);       {date selected}
    ^Z  : SetDate(calGetValidDate(SysUtils.Date-1, +1));
  end;
end;
{=====}

procedure TVpCustomCalendar.MouseDown(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);
var
  Yr, M, D: Word;
  Yr2, M2, D2: Word;
  R, C: Integer;
  OldIdx, NewIdx: Integer;
  Re: TRect;
  Ignore: Boolean;
  ClientOrigin: TPoint;

begin
  inherited;

  if (not Assigned (PopupMenu)) and (Button = mbRight) then begin
    if not focused then
      SetFocus;
    ClientOrigin := GetClientOrigin;
    FDefaultPopup.Popup (X + ClientOrigin.x, Y + ClientOrigin.y);
    Exit;
  end;

  {exit if this click happens when the popup menu is active}
  if clInPopup or (not Visible) then 
    Exit;

  SetFocus;

  inherited MouseDown(Button, Shift, X, Y);

  if IsReadOnly then
    Exit;

  {if we have the mouse captured, see if a button was clicked}
  if GetCapture = Handle then begin
    if (cdoShowNavBtns in Options) then begin
      Re := clBtnLeft.ClientRect;
      Re.TopLeft := ScreenToClient(clBtnLeft.ClientToScreen(Re.TopLeft));
      Re.BottomRight := ScreenToClient(clBtnLeft.ClientToScreen(Re.BottomRight));
      if PtInRect(Re, Point(X, Y)) then begin
        clBtnLeft.Click;
        Exit;
      end;

      Re := clBtnRight.ClientRect;
      Re.TopLeft := ScreenToClient(clBtnRight.ClientToScreen(Re.TopLeft));
      Re.BottomRight := ScreenToClient(clBtnRight.ClientToScreen(Re.BottomRight));
      if PtInRect(Re, Point(X, Y)) then begin
        clBtnRight.Click;
        Exit;
      end;

      Re := clBtnNextYear.ClientRect;
      Re.TopLeft := ScreenToClient(clBtnNextYear.ClientToScreen(Re.TopLeft));
      Re.BottomRight := ScreenToClient(clBtnNextYear.ClientToScreen(Re.BottomRight));
      if PtInRect(Re, Point(X, Y)) then begin
        clBtnNextYear.Click;
        Exit;
      end;

      Re := clBtnPrevYear.ClientRect;
      Re.TopLeft := ScreenToClient(clBtnPrevYear.ClientToScreen(Re.TopLeft));
      Re.BottomRight := ScreenToClient(clBtnPrevYear.ClientToScreen(Re.BottomRight));
      if PtInRect(Re, Point(X, Y)) then begin
        clBtnPrevYear.Click;
        Exit;
      end;
    end;

    if (cdoShowRevert in Options) then begin
      Re := clBtnRevert.ClientRect;
      Re.TopLeft := ScreenToClient(clBtnRevert.ClientToScreen(Re.TopLeft));
      Re.BottomRight := ScreenToClient(clBtnRevert.ClientToScreen(Re.BottomRight));
      if PtInRect(Re, Point(X, Y)) then begin
        clBtnRevert.Click;
        Exit;
      end;
    end;

    if (cdoShowToday in Options) then begin
      Re := clBtnToday.ClientRect;
      Re.TopLeft := ScreenToClient(clBtnToday.ClientToScreen(Re.TopLeft));
      Re.BottomRight := ScreenToClient(clBtnToday.ClientToScreen(Re.BottomRight));
      if PtInRect(Re, Point(X, Y)) then begin
        clBtnToday.Click;
        Exit;
      end;
    end;
  end;

  {save current date}
  DecodeDate(FDate, Yr, M, D);
  M2 := M;

  {calculate the row and column clicked on}
  for R := 2 to 8 do begin
    for C := 0 to 6 do begin
      if PtInRect(clRowCol[R,C], Point(X, Y)) then begin
        {convert to an index}
        NewIdx := ((R-2) * 7) + Succ(C);
        OldIdx := clFirst + Pred(clDay);
        Ignore := False;

        if NewIdx <> OldIdx then begin
          {see if this date is disabled - selection not allowed}
          if not DoOnGetDateEnabled(FDate+(NewIdx-OldIdx)) then
            Break;
          DecodeDate(FDate+(NewIdx-OldIdx), Yr2, M2, D2);
          if not (cdoShowInactive in FOptions) then begin
            {will this change the month?}
            if M2 <> M then
              Ignore := True;
          end;
          {convert to a date and redraw}
          if not Ignore then
            SetDate(FDate+(NewIdx-OldIdx));
        end;

        if (not Ignore) and (Button = mbLeft) then begin
          if M2 <> M then begin
              FBrowsing := True;
            try
              DoOnChange(FDate);
            finally
              FBrowsing := False;
            end;
          end else
            DoOnChange(FDate);
        end;

        Break;
      end;
    end;
  end;
end;
{=====}

procedure TVpCustomCalendar.MouseUp(Button: TMouseButton; Shift: TShiftState; X, Y: Integer);
var
  P: TPoint;
  M: TPopUpMenu;
  MI: TMenuItem;
  I: Integer;
  J: Integer;
  K: Integer;
  MO: Integer;
  YR: Word;
  MM: Word;
  DA: Word;
  HC: Boolean;
begin
  inherited MouseUp(Button, Shift, X, Y);

  if (PopUpMenu = nil) and (Button = mbRight) and
     (Y < clRowCol[1,0].Top) {above day names} and
     (X > clBtnPrevYear.Left + clBtnNextYear.Width) and (X < clBtnNextYear.Left)
  then begin
    if not Focused and CanFocus then
      SetFocus;

    M := TPopupMenu.Create(Self);
    try
      DecodeDate(FDate, YR, MM, DA);
      MO := MM; {convert to integer to avoid wrap-around errors with words}

      {determine the starting month}
      I := MO - 3;
      if I < 1 then
        I := MO - 3 + 12;

      {determine the ending month + 1}
      J := MO + 4;
      if J > 12 then
        J := MO + 4 - 12;

      K := 0;
      {create the menu items}
      repeat
        MI := TMenuItem.Create(M);
        MI.Caption := FormatSettings.LongMonthNames[I];
        MI.Enabled := Enabled;
        MI.OnClick := calChangeMonth;
        MI.Tag := I;
        MI.HelpContext := K;
        M.Items.Add(MI);
        Inc(I);
        Inc(K);
        if I > 12 then
          I := 1;
      until I = J;

      HC := GetCapture = Handle;

      P.X := X-20;
      P.Y := Y - (GetSystemMetrics(SM_CYMENU)*7) div 2;
      P := ClientToScreen(P);
      {move the mouse to cause the menu item to highlight}
      {$IFDEF DELPHI}
      PostMessage(Handle, WM_MOUSEMOVE, 0, MAKELONG(P.X,P.Y+1));
      {$ELSE}
      PostMessage(Handle, LM_MOUSEMOVE, 0, MAKELONG(P.X,P.Y+1));
      {$ENDIF}

      clInPopup := True;
      try
        M.PopUp(P.X, P.Y);

        Application.ProcessMessages;

        {capture the mouse again}
        if clPopup and HC then
          SetCapture(Handle);
      finally
        clInPopup := false;
      end;
    finally
      M.Free;
    end;
  end;
end;

{ Changes the day by Delta (signed) days }
procedure TVpCustomCalendar.IncDay(Delta: Integer);
begin
  if Delta > 0 then
    SetDate(calGetValidDate(FDate+Delta-1, +1))
  else
    SetDate(calGetValidDate(FDate+Delta+1, -1));
end;

{ Changes the month by Delta (signed) months }
procedure TVpCustomCalendar.IncMonth(Delta: Integer);
begin
  SetDate(SysUtils.IncMonth(FDate, Delta));
end;

procedure TVpCustomCalendar.IncYear(Delta: Integer);
begin
  SetDate(DateUtils.IncYear(FDate, Delta));
end;

function TVpCustomCalendar.IsHoliday(ADate: TDate; out AHolidayName: String): Boolean;
begin
  Result := false;
  AHolidayName := '';
  if Assigned(FOnHoliday) then
  begin
    FOnHoliday(Self, trunc(ADate), AHolidayName);
    Result := AHolidayName <> '';
  end else
  if Assigned(FControlLink) then
    Result := FControlLink.IsHoliday(ADate, AHolidayName);
end;

procedure TVpCustomCalendar.Paint;
begin
  RenderToCanvas(
    Canvas,                      // Paint Canvas
    Rect (0, 0, Width, Height),  // Paint Rectangle
    ra0,
    1,                           // Scale
    Date,                        // Date
    -1,                          // Start At
    -1,                          // End At
    gr30Min,
    False);                      // Display Only
end;

procedure TVpCustomCalendar.LinkHandler(Sender: TComponent;
  NotificationType: TVpNotificationType; const Value: Variant);
begin
  clInLinkHandler := true;
  try
    if NotificationType = neDateChange then
      Date := Value
    else if NotificationType = neInvalidate then
      Invalidate;
  finally
    clInLinkHandler := false;
  end;
end;

function TVpCustomCalendar.GetDay: Integer;
begin
  Result := clDay;
end;

function TVpCustomCalendar.GetMonth: Integer;
begin
  Result := clMonth;
end;

function TVpCustomCalendar.GetYear: Integer;
begin
  Result := clYear;
end;

function TVpCustomCalendar.GetControlType: TVpItemType;
begin
  Result := itCalendar;
end;

procedure TVpCustomCalendar.LoadLanguage;
var
  item: TMenuItem;
begin
  for item in FDefaultPopup.Items do
    if item is TVpMenuItem then
      TVpMenuItem(item).Translate;
end;

procedure TVpCustomCalendar.PaintToCanvas(ACanvas: TCanvas; ARect: TRect;
  Angle: TVpRotationAngle; ADate: TDateTime);
begin
  RenderToCanvas(ACanvas, ARect, Angle, 1, ADate, -1, -1, gr30Min, True);
end;

procedure TVpCustomCalendar.RenderToCanvas(RenderCanvas: TCanvas;
  RenderIn: TRect; Angle: TVpRotationAngle; Scale: Extended;
  RenderDate: TDateTime; StartLine: Integer; StopLine: Integer;
  UseGran: TVpGranularity; DisplayOnly: Boolean);
var
  painter: TVpCalendarPainter;
begin
  painter := TVpCalendarPainter.Create(Self, RenderCanvas);
  try
    painter.RenderToCanvas(RenderIn, Angle, Scale, RenderDate,
      StartLine, StopLine, UseGran, DisplayOnly);
  finally
    painter.Free;
  end;
end;

{$IFNDEF LCL}
procedure TVpCustomCalendar.SetBorderStyle(Value: TBorderStyle);
begin
  if Value <> FBorderStyle then begin
    FBorderStyle := Value;
    Invalidate;
  end;
end;
{$ENDIF}

procedure TVpCustomCalendar.SetColor(Value: TColor);
begin
  Colors.Background := Value;
end;

procedure TVpCustomCalendar.SetBounds(ALeft, ATop, AWidth, AHeight: Integer);
begin
  inherited SetBounds(ALeft, ATop, AWidth, AHeight);
  if csLoading in ComponentState then
    Exit;
  calRecalcSize(False);
end;

procedure TVpCustomCalendar.SetDate(Value: TDateTime);
var
  R: TRect;
  Y: Word;
  M: Word;
  D: Word;
begin
  if Value <> FDate then begin
    {determine if the new date is in the same month}
    DecodeDate(Value, Y, M, D);
    if (clYear = Y) and (clMonth = M) then begin
      {invalidate the old date}
      R := calGetCurrentRectangle;
      InvalidateRect(Handle, @R, False);
    end else
      Invalidate;

    DecodeDate(Value, clYear, clMonth, clDay);
    FDate := Value;
    calRebuildCalArray (FDate);

    {invalidate the new date}
    R := calGetCurrentRectangle;
    InvalidateRect(Handle, @R, False);

    if (not clInLinkHandler) and (ControlLink <> nil) then
      ControlLink.Notify(self, neDateChange, Date);
  end;
end;

procedure TVpCustomCalendar.SetDateFormat(Value: TVpDateFormat);
begin
  if Value <> FDateFormat then begin
   FDateFormat := Value;
   Invalidate;
  end;
end;

procedure TVpCustomCalendar.SetDayNameWidth(Value: TVpDayNameWidth);
begin
  if Value <> FDayNameWidth then begin
   FDayNameWidth := Value;
   Invalidate;
  end;
end;

procedure TVpCustomCalendar.SetDisplayOptions(Value: TVpCalDisplayOptions);
begin
  if Value <> FOptions then begin
    FOptions := Value;
    if csDesigning in ComponentState then begin
      if cdoShowRevert in Options then
        clBtnRevert.Parent := Self
      else
        clBtnRevert.Parent := nil;
      if cdoShowToday in Options then
        clBtnToday.Parent := Self
      else
        clBtnToday.Parent := nil;
      if cdoShowNavBtns in Options then begin
        clBtnLeft.Parent := Self;
        clBtnRight.Parent := Self;
        clBtnNextYear.Parent := Self;
        clBtnPrevYear.Parent := Self;
      end else begin
        clBtnLeft.Parent := nil;
        clBtnRight.Parent := nil;
        clBtnNextYear.Parent := nil;
        clBtnPrevYear.Parent := nil;
      end;
    end;
    calRecalcSize (False);
    Invalidate;
  end;
end;

{ Set the DrawHeader property value }
procedure TVpCustomCalendar.SetDrawHeader(Value: Boolean);
begin
  if Value <> FDrawHeader then begin
    FDrawHeader := Value;
    if FDrawHeader then begin
      clStartRow := 0;
      clRowCount := 8;
    end else begin
      clStartRow := 2;
      clRowCount := 7;
    end;
    calRecalcSize (False);
    Refresh;
  end;
end;

{ Set the calendar to todays date }
procedure TVpCustomCalendar.SetToday;
begin
  Date := Now;
end;

procedure TVpCustomCalendar.SetWantDblClicks(Value: Boolean);
begin
  if Value <> FWantDblClicks then begin
    FWantDblClicks := Value;
    RecreateWnd(Self); { *Converted from RecreateWnd* }
  end;
end;

procedure TVpCustomCalendar.SetWeekStarts(Value: TVpDayType);
begin
  if Value <> FWeekStarts then begin
    FWeekStarts := Value;
    if csLoading in ComponentState then
      Exit;
    calRebuildCalArray (FDate);
    Invalidate;
  end;
end;

{$IFDEF DELPHI}
procedure TVpCustomCalendar.WMEraseBkgnd(var Msg: TWMEraseBkgnd);
begin
  Msg.Result := 1;   {don't erase background, just say we did. Shhhhhhh!}
end;

procedure TVpCustomCalendar.WMGetDlgCode(var Msg: TWMGetDlgCode);
begin
  Msg.Result := DLGC_WANTARROWS;
end;

procedure TVpCustomCalendar.WMKillFocus(var Msg: TWMKillFocus);
begin
  inherited;
  Invalidate;
end;
{$ELSE}
procedure TVpCustomCalendar.WMEraseBkgnd(var Msg: TLMEraseBkgnd);
begin
  Msg.Result := 1;   {don't erase background, just say we did. Shhhhhhh!}
end;
                           {
procedure TVpCustomCalendar.WMGetDlgCode(var Msg: TLMGetDlgCode);
begin
  Msg.Result := DLGC_WANTARROWS;
end;                        }
{=====}

procedure TVpCustomCalendar.WMKillFocus(var Msg: TLMKillFocus);
begin
  inherited;
  Invalidate;
end;
{$ENDIF}

function TVpCustomCalendar.GetPopupMenu: TPopupMenu;
begin
  if FExternalPopup = nil then
    Result := FDefaultPopup
  else
    Result := FExternalPopup;
end;

procedure TVpCustomCalendar.SetPopupMenu(AValue: TPopupMenu);
begin
  if (AValue = nil) or (AValue = FDefaultPopup) then
    FExternalPopup := nil
  else
    FExternalPopup := AValue;
end;

procedure TVpCustomCalendar.InitializeDefaultPopup;
var
  NewItem: TVpMenuItem;
begin
  if RSToday <> '' then begin
    NewItem := TVpMenuItem.Create (Self);
    NewItem.Kind := mikToday;
    NewItem.OnClick := PopupToday;
    FDefaultPopup.Items.Add(NewItem);
  end;

  if RSNextMonth <> '' then begin
    NewItem := TVpMenuItem.Create (Self);
    NewItem.Kind := mikNextMonth;
    NewItem.OnClick := PopupNextMonth;
    FDefaultPopup.Items.Add(NewItem);
  end;

  if RSPrevMonth <> '' then begin
    NewItem := TVpMenuItem.Create (Self);
    NewItem.Kind := mikPrevMonth;
    NewItem.OnClick := PopupPrevMonth;
    FDefaultPopup.Items.Add(NewItem);
  end;

  if RSNextYear <> '' then begin
    NewItem := TVpMenuItem.Create (Self);
    NewItem.Kind := mikNextYear;
    NewItem.OnClick := PopupNextYear;
    FDefaultPopup.Items.Add(NewItem);
  end;

  if RSPrevYear <> '' then begin
    NewItem := TVpMenuItem.Create (Self);
    NewItem.Kind := mikPrevYear;
    NewItem.OnClick := PopupPrevYear;
    FDefaultPopup.Items.Add(NewItem);
  end;
end;

procedure TVpCustomCalendar.PopupToday(Sender: TObject);
begin
  SetDate(Now);
end;

procedure TVpCustomCalendar.PopupNextMonth(Sender: TObject);
begin
  IncMonth(1);
end;

procedure TVpCustomCalendar.PopupPrevMonth(Sender: TObject);
begin
  IncMonth(-1);
end;

procedure TVpCustomCalendar.PopupNextYear(Sender: TObject);
begin
  IncYear(1);
end;

procedure TVpCustomCalendar.PopupPrevYear(Sender: TObject);
begin
  IncYear(-1);
end;

end.