pickdate.pas

RX Library contains a large number of components, objects and routines for Borland Delphi with full

end;

procedure TRxCalendar.NextMonth;
begin
  ChangeMonth(1);
end;

procedure TRxCalendar.NextYear;
begin
  if IsLeapYear(Year) and (Month = 2) and (Day = 29) then Day := 28;
  Year := Year + 1;
end;

procedure TRxCalendar.PrevYear;
begin
  if IsLeapYear(Year) and (Month = 2) and (Day = 29) then Day := 28;
  Year := Year - 1;
end;

procedure TRxCalendar.CalendarUpdate(DayOnly: Boolean);
var
  AYear, AMonth, ADay: Word;
  FirstDate: TDateTime;
begin
  FUpdating := True;
  try
    DecodeDate(FDate, AYear, AMonth, ADay);
    FirstDate := EncodeDate(AYear, AMonth, 1);
    FMonthOffset := 2 - ((DayOfWeek(FirstDate) - Ord(StartOfWeek) + 7) mod 7);
      { day of week for 1st of month }
    if FMonthOffset = 2 then FMonthOffset := -5;
    MoveColRow((ADay - FMonthOffset) mod 7, (ADay - FMonthOffset) div 7 + 1,
      False, False);
    if DayOnly then Update else Invalidate;
  finally
    FUpdating := False;
  end;
end;

procedure TRxCalendar.UpdateCalendar;
begin
  CalendarUpdate(False);
end;

procedure TRxCalendar.WMSize(var Message: TWMSize);
var
  GridLinesH, GridLinesW: Integer;
begin
  GridLinesH := 6 * GridLineWidth;
  if (goVertLine in Options) or (goFixedVertLine in Options) then
    GridLinesW := 6 * GridLineWidth
  else GridLinesW := 0;
  DefaultColWidth := (Message.Width - GridLinesW) div 7;
  DefaultRowHeight := (Message.Height - GridLinesH) div 7;
end;

{ TLocCalendar }

type
  TLocCalendar = class(TRxCalendar)
  private
    procedure CMEnabledChanged(var Message: TMessage); message CM_ENABLEDCHANGED;
    procedure CMParentColorChanged(var Message: TMessage); message CM_PARENTCOLORCHANGED;
  protected
    procedure CreateParams(var Params: TCreateParams); override;
    procedure DrawCell(ACol, ARow: Longint; ARect: TRect; AState: TGridDrawState); override;
  public
    constructor Create(AOwner: TComponent); override;
    procedure MouseToCell(X, Y: Integer; var ACol, ARow: Longint);
    property GridLineWidth;
    property DefaultColWidth;
    property DefaultRowHeight;
  end;

constructor TLocCalendar.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  ControlStyle := [csCaptureMouse, csClickEvents, csDoubleClicks];
{$IFDEF WIN32}
  ControlStyle := ControlStyle + [csReplicatable];
{$ENDIF}
  Ctl3D := False;
  Enabled := False;
  BorderStyle := bsNone;
  ParentColor := True;
  CalendarDate := Trunc(Now);
  UseCurrentDate := False;
  FixedColor := Self.Color;
  Options := [goFixedHorzLine];
  TabStop := False;
end;

procedure TLocCalendar.CMParentColorChanged(var Message: TMessage);
begin
  inherited;
  if ParentColor then FixedColor := Self.Color;
end;

procedure TLocCalendar.CMEnabledChanged(var Message: TMessage);
begin
  if HandleAllocated and not (csDesigning in ComponentState) then
    EnableWindow(Handle, True);
end;

procedure TLocCalendar.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
  with Params do
    Style := Style and not (WS_BORDER or WS_TABSTOP or WS_DISABLED);
end;

procedure TLocCalendar.MouseToCell(X, Y: Integer; var ACol, ARow: Longint);
var
  Coord: TGridCoord;
begin
  Coord := MouseCoord(X, Y);
  ACol := Coord.X;
  ARow := Coord.Y;
end;

procedure TLocCalendar.DrawCell(ACol, ARow: Longint; ARect: TRect;
  AState: TGridDrawState);
var
  D, M, Y: Word;
begin
  inherited DrawCell(ACol, ARow, ARect, AState);
  DecodeDate(CalendarDate, Y, M, D);
  D := StrToIntDef(CellText[ACol, ARow], 0);
  if (D > 0) and (D <= DaysPerMonth(Y, M)) then begin
    if (EncodeDate(Y, M, D) = SysUtils.Date) then
      Frame3D(Canvas, ARect, clBtnShadow, clBtnHighlight, 1);
  end;
end;

{ TPopupCalendar }

type
  TPopupCalendar = class(TPopupWindow)
  private
    FCalendar: TRxCalendar;
    FTitleLabel: TLabel;
    FFourDigitYear: Boolean;
    FBtns: array[0..3] of TRxSpeedButton;
    procedure CalendarMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure PrevMonthBtnClick(Sender: TObject);
    procedure NextMonthBtnClick(Sender: TObject);
    procedure PrevYearBtnClick(Sender: TObject);
    procedure NextYearBtnClick(Sender: TObject);
    procedure CalendarChange(Sender: TObject);
    procedure TopPanelDblClick(Sender: TObject);
  protected
    procedure KeyDown(var Key: Word; Shift: TShiftState); override;
    procedure KeyPress(var Key: Char); override;
{$IFDEF WIN32}
    function GetValue: Variant; override;
    procedure SetValue(const Value: Variant); override;
{$ELSE}
    function GetValue: string; override;
    procedure SetValue(const Value: string); override;
{$ENDIF}
  public
    constructor Create(AOwner: TComponent); override;
  end;

function CreatePopupCalendar(AOwner: TComponent
  {$IFDEF RX_D4}; ABiDiMode: TBiDiMode = bdLeftToRight {$ENDIF}): TWinControl;
begin
  Result := TPopupCalendar.Create(AOwner);
  if (AOwner <> nil) and not (csDesigning in AOwner.ComponentState) and
    (Screen.PixelsPerInch <> 96) then
  begin { scale to screen res }
    Result.ScaleBy(Screen.PixelsPerInch, 96);
    { The ScaleBy method does not scale the font well, so set the
      font back to the original info. }
    TPopupCalendar(Result).FCalendar.ParentFont := True;
    FontSetDefault(TPopupCalendar(Result).Font);
{$IFDEF RX_D4}
    Result.BiDiMode := ABiDiMode;
{$ENDIF}
  end;
end;

procedure SetupPopupCalendar(PopupCalendar: TWinControl;
  AStartOfWeek: TDayOfWeekName; AWeekends: TDaysOfWeek;
  AWeekendColor: TColor; BtnHints: TStrings; FourDigitYear: Boolean);
var
  I: Integer;
begin
  if (PopupCalendar = nil) or not (PopupCalendar is TPopupCalendar) then
    Exit;
  TPopupCalendar(PopupCalendar).FFourDigitYear := FourDigitYear;
  if TPopupCalendar(PopupCalendar).FCalendar <> nil then begin
    with TPopupCalendar(PopupCalendar).FCalendar do begin
      StartOfWeek := AStartOfWeek;
      WeekendColor := AWeekendColor;
      Weekends := AWeekends;
    end;
    if (BtnHints <> nil) then
      for I := 0 to Min(BtnHints.Count - 1, 3) do begin
        if BtnHints[I] <> '' then
          TPopupCalendar(PopupCalendar).FBtns[I].Hint := BtnHints[I];
      end;
  end;
end;

constructor TPopupCalendar.Create(AOwner: TComponent);
const
  BtnSide = 14;
var
  Control, BackPanel: TWinControl;
begin
  inherited Create(AOwner);
  FFourDigitYear := FourDigitYear;
  Height := Max(PopupCalendarSize.Y, 120);
  Width := Max(PopupCalendarSize.X, 180);
  Color := clBtnFace;
  FontSetDefault(Font);
  if AOwner is TControl then ShowHint := TControl(AOwner).ShowHint
  else ShowHint := True;
  if (csDesigning in ComponentState) then Exit;

  BackPanel := TPanel.Create(Self);
  with BackPanel as TPanel do begin
    Parent := Self;
    Align := alClient;
    ParentColor := True;
{$IFDEF WIN32}
    ControlStyle := ControlStyle + [csReplicatable];
{$ENDIF}
  end;

  Control := TPanel.Create(Self);
  with Control as TPanel do begin
    Parent := BackPanel;
    Align := alTop;
    Width := Self.Width - 4;
    Height := 18;
    BevelOuter := bvNone;
    ParentColor := True;
{$IFDEF WIN32}
    ControlStyle := ControlStyle + [csReplicatable];
{$ENDIF}
  end;

  FCalendar := TLocCalendar.Create(Self);
  with TLocCalendar(FCalendar) do begin
    Parent := BackPanel;
    Align := alClient;
    OnChange := CalendarChange;
    OnMouseUp := CalendarMouseUp;
  end;

  FBtns[0] := TRxTimerSpeedButton.Create(Self);
  with FBtns[0] do begin
    Parent := Control;
    SetBounds(-1, -1, BtnSide, BtnSide);
    Glyph.Handle := LoadBitmap(hInstance, SBtnGlyphs[0]);
    OnClick := PrevYearBtnClick;
    Hint := LoadStr(SPrevYear);
  end;

  FBtns[1] := TRxTimerSpeedButton.Create(Self);
  with FBtns[1] do begin
    Parent := Control;
    SetBounds(BtnSide - 2, -1, BtnSide, BtnSide);
    Glyph.Handle := LoadBitmap(hInstance, SBtnGlyphs[1]);
    OnClick := PrevMonthBtnClick;
    Hint := LoadStr(SPrevMonth);
  end;

  FTitleLabel := TLabel.Create(Self);
  with FTitleLabel do begin
    Parent := Control;
    AutoSize := False;
    Alignment := taCenter;
    SetBounds(BtnSide * 2 + 1, 1, Control.Width - 4 * BtnSide - 2, 14);
    Transparent := True;
    OnDblClick := TopPanelDblClick;
{$IFDEF WIN32}
    ControlStyle := ControlStyle + [csReplicatable];
{$ENDIF}
  end;

  FBtns[2] := TRxTimerSpeedButton.Create(Self);
  with FBtns[2] do begin
    Parent := Control;
    SetBounds(Control.Width - 2 * BtnSide + 2, -1, BtnSide, BtnSide);
    Glyph.Handle := LoadBitmap(hInstance, SBtnGlyphs[2]);
    OnClick := NextMonthBtnClick;
    Hint := LoadStr(SNextMonth);
  end;

  FBtns[3] := TRxTimerSpeedButton.Create(Self);
  with FBtns[3] do begin
    Parent := Control;
    SetBounds(Control.Width - BtnSide + 1, -1, BtnSide, BtnSide);
    Glyph.Handle := LoadBitmap(hInstance, SBtnGlyphs[3]);
    OnClick := NextYearBtnClick;
    Hint := LoadStr(SNextYear);
  end;
end;

procedure TPopupCalendar.CalendarMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
var
  Col, Row: Longint;
begin
  if (Button = mbLeft) and (Shift = []) then begin
    TLocCalendar(FCalendar).MouseToCell(X, Y, Col, Row);
    if (Row > 0) and (FCalendar.CellText[Col, Row] <> '') then
      CloseUp(True);
  end;
end;

procedure TPopupCalendar.TopPanelDblClick(Sender: TObject);
begin
  FCalendar.CalendarDate := Trunc(Now);
end;

procedure TPopupCalendar.KeyDown(var Key: Word; Shift: TShiftState);
begin
  inherited KeyDown(Key, Shift);
  if FCalendar <> nil then
    case Key of
      VK_NEXT:
        begin
          if ssCtrl in Shift then FCalendar.NextYear
          else FCalendar.NextMonth;
        end;
      VK_PRIOR:
        begin
          if ssCtrl in Shift then FCalendar.PrevYear
          else FCalendar.PrevMonth;
        end;
      else TLocCalendar(FCalendar).KeyDown(Key, Shift);
    end;
end;

procedure TPopupCalendar.KeyPress(var Key: Char);
begin
  inherited KeyPress(Key);
  if (FCalendar <> nil) and (Key <> #0) then
    FCalendar.KeyPress(Key);
end;

{$IFDEF WIN32}

function TPopupCalendar.GetValue: Variant;
begin
  if (csDesigning in ComponentState) then
    Result := VarFromDateTime(SysUtils.Date)
  else
    Result := VarFromDateTime(FCalendar.CalendarDate);
end;

procedure TPopupCalendar.SetValue(const Value: Variant);
begin
  if not (csDesigning in ComponentState) then begin
    try
      if (Trim(ReplaceStr(VarToStr(Value), DateSeparator, '')) = '') or
        VarIsNull(Value) or VarIsEmpty(Value) then
        FCalendar.CalendarDate := VarToDateTime(SysUtils.Date)
      else FCalendar.CalendarDate := VarToDateTime(Value);
      CalendarChange(nil);
    except
      FCalendar.CalendarDate := VarToDateTime(SysUtils.Date);
    end;
  end;
end;

{$ELSE}

function TPopupCalendar.GetValue: string;
begin
  if (csDesigning in ComponentState) then
    Result := FormatDateTime(DefDateFormat(FFourDigitYear), SysUtils.Date)
  else
    Result := FormatDateTime(DefDateFormat(FFourDigitYear), FCalendar.CalendarDate);
end;

procedure TPopupCalendar.SetValue(const Value: string);