aaspin.pas

是一个免费并开源的支持农历的月历控件

  begin
    if Assigned(FOnUpClick) then FOnUpClick(Self);
  end
  else
    if Assigned(FOnDownClick) then FOnDownClick(Self);
end;

procedure TSpinButton.SetFocusBtn (Btn: TTimerSpeedButton);
begin
  if TabStop and CanFocus and  (Btn <> FFocusedButton) then
  begin
    FFocusedButton.TimeBtnState := FFocusedButton.TimeBtnState - [tbFocusRect];
    FFocusedButton := Btn;
    if (GetFocus = Handle) then
    begin
       FFocusedButton.TimeBtnState := FFocusedButton.TimeBtnState + [tbFocusRect];
       Invalidate;
    end;
  end;
end;

procedure TSpinButton.WMGetDlgCode(var Message: TWMGetDlgCode);
begin
  Message.Result := DLGC_WANTARROWS;
end;

procedure TSpinButton.Loaded;
var
  W, H: Integer;
begin
  inherited Loaded;
  W := Width;
  H := Height;
  AdjustSize (W, H);
  if (W <> Width) or (H <> Height) then
    inherited SetBounds (Left, Top, W, H);
end;

function TSpinButton.GetUpGlyph: TBitmap;
begin
  Result := FUpButton.Glyph;
end;

procedure TSpinButton.SetUpGlyph(Value: TBitmap);
begin
  if Value <> nil then
    FUpButton.Glyph := Value
  else
  begin
    FUpButton.Glyph.Handle := LoadBitmap(HInstance, 'CNSPINUP');
    FUpButton.NumGlyphs := 1;
    FUpButton.Invalidate;
  end;
end;

function TSpinButton.GetUpNumGlyphs: TNumGlyphs;
begin
  Result := FUpButton.NumGlyphs;
end;

procedure TSpinButton.SetUpNumGlyphs(Value: TNumGlyphs);
begin
  FUpButton.NumGlyphs := Value;
end;

function TSpinButton.GetDownGlyph: TBitmap;
begin
  Result := FDownButton.Glyph;
end;

procedure TSpinButton.SetDownGlyph(Value: TBitmap);
begin
  if Value <> nil then
    FDownButton.Glyph := Value
  else
  begin
    FDownButton.Glyph.Handle := LoadBitmap(HInstance, 'CNSPINDOWN');
    FUpButton.NumGlyphs := 1;
    FDownButton.Invalidate;
  end;
end;

function TSpinButton.GetDownNumGlyphs: TNumGlyphs;
begin
  Result := FDownButton.NumGlyphs;
end;

procedure TSpinButton.SetDownNumGlyphs(Value: TNumGlyphs);
begin
  FDownButton.NumGlyphs := Value;
end;

{ TSpinEdit }

constructor TSpinEdit.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FButton := TSpinButton.Create (Self);
  FButton.Width := 15;
  FButton.Height := 17;
  FButton.Visible := True;
  FButton.Parent := Self;
  FButton.FocusControl := Self;
  FButton.OnUpClick := UpClick;
  FButton.OnDownClick := DownClick;
  Text := '0';
  ControlStyle := ControlStyle - [csSetCaption];
  FIncrement := 1;
  FEditorEnabled := True;
end;

destructor TSpinEdit.Destroy;
begin
  FButton := nil;
  inherited Destroy;
end;

procedure TSpinEdit.GetChildren(Proc: TGetChildProc; Root: TComponent);
begin
end;

procedure TSpinEdit.KeyDown(var Key: Word; Shift: TShiftState);
begin
  if Key = VK_UP then UpClick (Self)
  else if Key = VK_DOWN then DownClick (Self);
  inherited KeyDown(Key, Shift);
end;

procedure TSpinEdit.KeyPress(var Key: Char);
begin
  if not IsValidChar(Key) then
  begin
    Key := #0;
    MessageBeep(0)
  end;
  if Key <> #0 then inherited KeyPress(Key);
end;

function TSpinEdit.IsValidChar(Key: Char): Boolean;
begin
  Result := (Key in [DecimalSeparator, '+', '-', '0'..'9']) or
    ((Key < #32) and (Key <> Chr(VK_RETURN)));
  if not FEditorEnabled and Result and ((Key >= #32) or
      (Key = Char(VK_BACK)) or (Key = Char(VK_DELETE))) then
    Result := False;
end;

procedure TSpinEdit.CreateParams(var Params: TCreateParams);
begin
  inherited CreateParams(Params);
{  Params.Style := Params.Style and not WS_BORDER;  }
  Params.Style := Params.Style or ES_MULTILINE or WS_CLIPCHILDREN;
end;

procedure TSpinEdit.CreateWnd;
begin
  inherited CreateWnd;
  SetEditRect;
end;

procedure TSpinEdit.SetEditRect;
var
  Loc: TRect;
begin
  SendMessage(Handle, EM_GETRECT, 0, LongInt(@Loc));
  Loc.Bottom := ClientHeight + 1;  {+1 is workaround for windows paint bug}
  Loc.Right := ClientWidth - FButton.Width - 2;
  Loc.Top := 0;
  Loc.Left := 0;
  SendMessage(Handle, EM_SETRECTNP, 0, LongInt(@Loc));
  SendMessage(Handle, EM_GETRECT, 0, LongInt(@Loc));  {debug}
end;

procedure TSpinEdit.WMSize(var Message: TWMSize);
var
  MinHeight: Integer;
begin
  inherited;
  MinHeight := GetMinHeight;
    { text edit bug: if size to less than minheight, then edit ctrl does
      not display the text }
  if Height < MinHeight then
    Height := MinHeight
  else if FButton <> nil then
  begin
    if NewStyleControls and Ctl3D then
      FButton.SetBounds(Width - FButton.Width - 5, 0, FButton.Width, Height - 5)
    else FButton.SetBounds (Width - FButton.Width, 1, FButton.Width, Height - 3);
    SetEditRect;
  end;
end;

function TSpinEdit.GetMinHeight: Integer;
var
  DC: HDC;
  SaveFont: HFont;
  I: Integer;
  SysMetrics, Metrics: TTextMetric;
begin
  DC := GetDC(0);
  GetTextMetrics(DC, SysMetrics);
  SaveFont := SelectObject(DC, Font.Handle);
  GetTextMetrics(DC, Metrics);
  SelectObject(DC, SaveFont);
  ReleaseDC(0, DC);
  I := SysMetrics.tmHeight;
  if I > Metrics.tmHeight then I := Metrics.tmHeight;
  Result := Metrics.tmHeight + I div 4 + GetSystemMetrics(SM_CYBORDER) * 4 + 2;
end;

procedure TSpinEdit.UpClick (Sender: TObject);
begin
  if ReadOnly then MessageBeep(0)
  else Value := Value + FIncrement;
end;

procedure TSpinEdit.DownClick (Sender: TObject);
begin
  if ReadOnly then MessageBeep(0)
  else Value := Value - FIncrement;
end;

procedure TSpinEdit.WMPaste(var Message: TWMPaste);
begin
  if not FEditorEnabled or ReadOnly then Exit;
  inherited;
end;

procedure TSpinEdit.WMCut(var Message: TWMPaste);
begin
  if not FEditorEnabled or ReadOnly then Exit;
  inherited;
end;

procedure TSpinEdit.CMExit(var Message: TCMExit);
begin
  inherited;
  if CheckValue (Value) <> Value then
    SetValue (Value);
end;

function TSpinEdit.GetValue: LongInt;
begin
  try
    Result := StrToInt (Text);
  except
    Result := FMinValue;
  end;
end;

procedure TSpinEdit.SetValue (NewValue: LongInt);
begin
  Text := IntToStr (CheckValue (NewValue));
end;

function TSpinEdit.CheckValue (NewValue: LongInt): LongInt;
begin
  Result := NewValue;
  if (FMaxValue <> FMinValue) then
  begin
    if NewValue < FMinValue then
      Result := FMinValue
    else if NewValue > FMaxValue then
      Result := FMaxValue;
  end;
end;

procedure TSpinEdit.CMEnter(var Message: TCMGotFocus);
begin
  if AutoSelect and not (csLButtonDown in ControlState) then
    SelectAll;
  inherited;
end;

{TTimerSpeedButton}

destructor TTimerSpeedButton.Destroy;
begin
  if FRepeatTimer <> nil then
    FRepeatTimer.Free;
  inherited Destroy;
end;

procedure TTimerSpeedButton.MouseDown(Button: TMouseButton; Shift: TShiftState;
  X, Y: Integer);
begin
  inherited MouseDown (Button, Shift, X, Y);
  if tbAllowTimer in FTimeBtnState then
  begin
    if FRepeatTimer = nil then
      FRepeatTimer := TTimer.Create(Self);

    FRepeatTimer.OnTimer := TimerExpired;
    FRepeatTimer.Interval := InitRepeatPause;
    FRepeatTimer.Enabled  := True;
  end;
end;

procedure TTimerSpeedButton.MouseUp(Button: TMouseButton; Shift: TShiftState;
                                  X, Y: Integer);
begin
  inherited MouseUp (Button, Shift, X, Y);
  if FRepeatTimer <> nil then
    FRepeatTimer.Enabled  := False;
end;

procedure TTimerSpeedButton.TimerExpired(Sender: TObject);
begin
  FRepeatTimer.Interval := RepeatPause;
  if (FState = bsDown) and MouseCapture then
  begin
    try
      Click;
    except
      FRepeatTimer.Enabled := False;
      raise;
    end;
  end;
end;

procedure TTimerSpeedButton.Paint;
var
  R: TRect;
begin
  inherited Paint;
  if tbFocusRect in FTimeBtnState then
  begin
    R := Bounds(0, 0, Width, Height);
    InflateRect(R, -3, -3);
    if FState = bsDown then
      OffsetRect(R, 1, 1);
    DrawFocusRect(Canvas.Handle, R);
  end;
end;

end.