pickdate.pas

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{*******************************************************}
{                                                       }
{         Delphi VCL Extensions (RX)                    }
{                                                       }
{         Copyright (c) 1995, 1996 AO ROSNO             }
{         Copyright (c) 1997, 1998 Master-Bank          }
{                                                       }
{*******************************************************}

unit PickDate;

{$I RX.INC}
{$S-}

interface

uses Windows, Classes, Variants, Controls, SysUtils, Graphics, DateUtil;

{ Calendar dialog }

function SelectDate(var Date: TDateTime; const DlgCaption: TCaption;
  AStartOfWeek: TDayOfWeekName; AWeekends: TDaysOfWeek;
  AWeekendColor: TColor; BtnHints: TStrings): Boolean;
function SelectDateStr(var StrDate: string; const DlgCaption: TCaption;
  AStartOfWeek: TDayOfWeekName; AWeekends: TDaysOfWeek;
  AWeekendColor: TColor; BtnHints: TStrings): Boolean;
function PopupDate(var Date: TDateTime; Edit: TWinControl): Boolean;

{ Popup calendar }

function CreatePopupCalendar(AOwner: TComponent
  {$IFDEF RX_D4}; ABiDiMode: TBiDiMode = bdLeftToRight {$ENDIF}): TWinControl;
procedure SetupPopupCalendar(PopupCalendar: TWinControl;
  AStartOfWeek: TDayOfWeekName; AWeekends: TDaysOfWeek;
  AWeekendColor: TColor; BtnHints: TStrings; FourDigitYear: Boolean);

const
  PopupCalendarSize: TPoint = (X: 187; Y: 124);

implementation

uses Messages, Consts, Forms, Buttons, StdCtrls, Grids, ExtCtrls, RXCtrls,
  RXCConst, ToolEdit, VCLUtils, MaxMin, rxStrUtils;

{$IFDEF WIN32}
 {$R *.R32}
{$ELSE}
 {$R *.R16}
{$ENDIF}

const
  SBtnGlyphs: array[0..3] of PChar = ('PREV2', 'PREV1', 'NEXT1', 'NEXT2');

procedure FontSetDefault(AFont: TFont);
{$IFDEF WIN32}
var
  NonClientMetrics: TNonClientMetrics;
{$ENDIF}
begin
{$IFDEF WIN32}
  NonClientMetrics.cbSize := SizeOf(NonClientMetrics);
  if SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, @NonClientMetrics, 0) then
    AFont.Handle := CreateFontIndirect(NonClientMetrics.lfMessageFont)
  else
{$ENDIF}
  with AFont do begin
    Color := clWindowText;
    Name := 'MS Sans Serif';
    Size := 8;
    Style := [];
  end;
end;

{ TRxTimerSpeedButton }

type
  TRxTimerSpeedButton = class(TRxSpeedButton)
  public
    constructor Create(AOwner: TComponent); override;
  published
    property AllowTimer default True;
    property Style default bsWin31;
  end;

constructor TRxTimerSpeedButton.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Style := bsWin31;
  AllowTimer := True;
{$IFDEF WIN32}
  ControlStyle := ControlStyle + [csReplicatable];
{$ENDIF}
end;

{ TRxCalendar }

{ TRxCalendar implementation copied from Borland CALENDAR.PAS sample unit
  and modified }

type
  TDayOfWeek = 0..6;

  TRxCalendar = class(TCustomGrid)
  private
    FDate: TDateTime;
    FMonthOffset: Integer;
    FOnChange: TNotifyEvent;
    FReadOnly: Boolean;
    FStartOfWeek: TDayOfWeekName;
    FUpdating: Boolean;
    FUseCurrentDate: Boolean;
    FWeekends: TDaysOfWeek;
    FWeekendColor: TColor;
    function GetCellText(ACol, ARow: Integer): string;
    function GetDateElement(Index: Integer): Integer;
    procedure SetCalendarDate(Value: TDateTime);
    procedure SetDateElement(Index: Integer; Value: Integer);
    procedure SetStartOfWeek(Value: TDayOfWeekName);
    procedure SetUseCurrentDate(Value: Boolean);
    procedure SetWeekendColor(Value: TColor);
    procedure SetWeekends(Value: TDaysOfWeek);
    function IsWeekend(ACol, ARow: Integer): Boolean;
    procedure CalendarUpdate(DayOnly: Boolean);
    function StoreCalendarDate: Boolean;
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure Change; dynamic;
    procedure ChangeMonth(Delta: Integer);
    procedure Click; override;
    function DaysThisMonth: Integer;
    procedure DrawCell(ACol, ARow: Longint; ARect: TRect; AState: TGridDrawState); override;
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
    function SelectCell(ACol, ARow: Longint): Boolean; override;
    procedure WMSize(var Message: TWMSize); message WM_SIZE;
  public
    constructor Create(AOwner: TComponent); override;
    procedure NextMonth;
    procedure NextYear;
    procedure PrevMonth;
    procedure PrevYear;
    procedure UpdateCalendar; virtual;
    property CellText[ACol, ARow: Integer]: string read GetCellText;
  published
    property CalendarDate: TDateTime read FDate write SetCalendarDate
      stored StoreCalendarDate;
    property Day: Integer index 3  read GetDateElement write SetDateElement stored False;
    property Month: Integer index 2  read GetDateElement write SetDateElement stored False;
    property ReadOnly: Boolean read FReadOnly write FReadOnly default False;
    property StartOfWeek: TDayOfWeekName read FStartOfWeek write SetStartOfWeek default Mon;
    property UseCurrentDate: Boolean read FUseCurrentDate write SetUseCurrentDate default True;
    property WeekendColor: TColor read FWeekendColor write SetWeekendColor default clRed;
    property Weekends: TDaysOfWeek read FWeekends write SetWeekends default [Sun];
    property Year: Integer index 1  read GetDateElement write SetDateElement stored False;
    property OnChange: TNotifyEvent read FOnChange write FOnChange;
  end;

constructor TRxCalendar.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FUseCurrentDate := True;
  FStartOfWeek := Mon;
  FWeekends := [Sun];
  FWeekendColor := clRed;
  FixedCols := 0;
  FixedRows := 1;
  ColCount := 7;
  RowCount := 7;
  ScrollBars := ssNone;
  Options := Options - [goRangeSelect] + [goDrawFocusSelected];
  ControlStyle := ControlStyle + [csFramed];
  FDate := Date;
  UpdateCalendar;
end;

procedure TRxCalendar.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  Params.Style := Params.Style or WS_BORDER;
{$IFDEF WIN32}
  Params.ExStyle := Params.ExStyle and not WS_EX_CLIENTEDGE;
{$ENDIF}
{$IFDEF RX_D4}
  AddBiDiModeExStyle(Params.ExStyle);
{$ENDIF}
end;

procedure TRxCalendar.Change;
begin
  if Assigned(FOnChange) then FOnChange(Self);
end;

procedure TRxCalendar.Click;
var
  TheCellText: string;
begin
  inherited Click;
  TheCellText := CellText[Col, Row];
  if TheCellText <> '' then Day := StrToInt(TheCellText);
end;

function TRxCalendar.DaysThisMonth: Integer;
begin
  Result := DaysPerMonth(Year, Month);
end;

procedure TRxCalendar.DrawCell(ACol, ARow: Longint; ARect: TRect; AState: TGridDrawState);
var
  TheText: string;
begin
  TheText := CellText[ACol, ARow];
  with ARect, Canvas do begin
    if IsWeekend(ACol, ARow) and not (gdSelected in AState) then
      Font.Color := WeekendColor;
    TextRect(ARect, Left + (Right - Left - TextWidth(TheText)) div 2,
      Top + (Bottom - Top - TextHeight(TheText)) div 2, TheText);
  end;
end;

function TRxCalendar.GetCellText(ACol, ARow: Integer): string;
var
  DayNum: Integer;
begin
  if ARow = 0 then  { day names at tops of columns }
    Result := ShortDayNames[(Ord(StartOfWeek) + ACol) mod 7 + 1]
  else begin
    DayNum := FMonthOffset + ACol + (ARow - 1) * 7;
    if (DayNum < 1) or (DayNum > DaysThisMonth) then Result := ''
    else Result := IntToStr(DayNum);
  end;
end;

procedure TRxCalendar.KeyDown(var Key: Word; Shift: TShiftState);
begin
  if Shift = [] then
    case Key of
      VK_LEFT, VK_SUBTRACT:
        begin
          if (Day > 1) then Day := Day - 1
          else CalendarDate := CalendarDate - 1;
          Exit;
        end;
      VK_RIGHT, VK_ADD:
        begin
          if (Day < DaysThisMonth) then Day := Day + 1
          else CalendarDate := CalendarDate + 1;
          Exit;
        end
    end;
  inherited KeyDown(Key, Shift);
end;

procedure TRxCalendar.KeyPress(var Key: Char);
begin
  if Key in ['T', 't'] then begin
    CalendarDate := Trunc(Now);
    Key := #0;
  end;
  inherited KeyPress(Key);
end;

function TRxCalendar.SelectCell(ACol, ARow: Longint): Boolean;
begin
  if ((not FUpdating) and FReadOnly) or (CellText[ACol, ARow] = '') then
    Result := False
  else Result := inherited SelectCell(ACol, ARow);
end;

procedure TRxCalendar.SetCalendarDate(Value: TDateTime);
begin
  if FDate <> Value then begin
    FDate := Value;
    UpdateCalendar;
    Change;
  end;
end;

function TRxCalendar.StoreCalendarDate: Boolean;
begin
  Result := not FUseCurrentDate;
end;

function TRxCalendar.GetDateElement(Index: Integer): Integer;
var
  AYear, AMonth, ADay: Word;
begin
  DecodeDate(FDate, AYear, AMonth, ADay);
  case Index of
    1: Result := AYear;
    2: Result := AMonth;
    3: Result := ADay;
    else Result := -1;
  end;
end;

procedure TRxCalendar.SetDateElement(Index: Integer; Value: Integer);
var
  AYear, AMonth, ADay: Word;
begin
  if Value > 0 then begin
    DecodeDate(FDate, AYear, AMonth, ADay);
    case Index of
      1: if AYear <> Value then AYear := Value else Exit;
      2: if (Value <= 12) and (Value <> AMonth) then begin
           AMonth := Value;
           if ADay > DaysPerMonth(Year, Value) then
             ADay := DaysPerMonth(Year, Value);
         end else Exit;
      3: if (Value <= DaysThisMonth) and (Value <> ADay) then
           ADay := Value
         else Exit;
      else Exit;
    end;
    FDate := EncodeDate(AYear, AMonth, ADay);
    FUseCurrentDate := False;
    CalendarUpdate(Index = 3);
    Change;
  end;
end;

procedure TRxCalendar.SetWeekendColor(Value: TColor);
begin
  if Value <> FWeekendColor then begin
    FWeekendColor := Value;
    Invalidate;
  end;
end;

procedure TRxCalendar.SetWeekends(Value: TDaysOfWeek);
begin
  if Value <> FWeekends then begin
    FWeekends := Value;
    UpdateCalendar;
  end;
end;

function TRxCalendar.IsWeekend(ACol, ARow: Integer): Boolean;
begin
  Result := TDayOfWeekName((Integer(StartOfWeek) + ACol) mod 7) in FWeekends;
end;

procedure TRxCalendar.SetStartOfWeek(Value: TDayOfWeekName);
begin
  if Value <> FStartOfWeek then begin
    FStartOfWeek := Value;
    UpdateCalendar;
  end;
end;

procedure TRxCalendar.SetUseCurrentDate(Value: Boolean);
begin
  if Value <> FUseCurrentDate then begin
    FUseCurrentDate := Value;
    if Value then begin
      FDate := Date; { use the current date, then }
      UpdateCalendar;
    end;
  end;
end;

{ Given a value of 1 or -1, moves to Next or Prev month accordingly }
procedure TRxCalendar.ChangeMonth(Delta: Integer);
var
  AYear, AMonth, ADay: Word;
  NewDate: TDateTime;
  CurDay: Integer;
begin
  DecodeDate(FDate, AYear, AMonth, ADay);
  CurDay := ADay;
  if Delta > 0 then ADay := DaysPerMonth(AYear, AMonth)
  else ADay := 1;
  NewDate := EncodeDate(AYear, AMonth, ADay);
  NewDate := NewDate + Delta;
  DecodeDate(NewDate, AYear, AMonth, ADay);
  if DaysPerMonth(AYear, AMonth) > CurDay then ADay := CurDay
  else ADay := DaysPerMonth(AYear, AMonth);
  CalendarDate := EncodeDate(AYear, AMonth, ADay);
end;

procedure TRxCalendar.PrevMonth;
begin
  ChangeMonth(-1);