rm_common.pas

进销存·完整的·有数据库的·非常完整·只得参考

    Width := DefBtnWidth;
end;

{ TRMSpinEdit }

constructor TRMSpinEdit.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  Text := '0';
  ControlStyle := ControlStyle - [csSetCaption];
  FIncrement := 1.0;
  FDecimal := 2;
  FMinValue := 0;
  FMaxValue := MaxInt;
  FEditorEnabled := True;
  FArrowKeys := True;
  RecreateButton;
end;

destructor TRMSpinEdit.Destroy;
begin
  Destroying;
  FChanging := True;
  if FButton <> nil then
  begin
    FButton.Free;
    FButton := nil;
    FBtnWindow.Free;
    FBtnWindow := nil;
  end;
  if FUpDown <> nil then
  begin
    FUpDown.Free;
    FUpDown := nil;
  end;
  inherited Destroy;
end;

procedure TRMSpinEdit.RecreateButton;
begin
  if (csDestroying in ComponentState) then
    Exit;
  FButton.Free;
  FButton := nil;
  FBtnWindow.Free;
  FBtnWindow := nil;
  FUpDown.Free;
  FUpDown := nil;
  FUpDown := TRxUpDown.Create(Self);
  with TRxUpDown(FUpDown) do
  begin
    Visible := True;
    SetBounds(0, 0, DefBtnWidth, Self.Height);
{$IFDEF Delphi4}
    if (BiDiMode = bdRightToLeft) then
      Align := alLeft
    else
{$ENDIF}
      Align := alRight;
    Parent := Self;
    OnClick := UpDownClick;
  end;
end;

procedure TRMSpinEdit.SetArrowKeys(Value: Boolean);
begin
  FArrowKeys := Value;
  ResizeButton;
end;

procedure TRMSpinEdit.UpDownClick(Sender: TObject; Button: TUDBtnType);
begin
  if TabStop and CanFocus then
    SetFocus;
  case Button of
    btNext: UpClick(Sender);
    btPrev: DownClick(Sender);
  end;
end;

function TRMSpinEdit.GetButtonWidth: Integer;
begin
  if FUpDown <> nil then
    Result := FUpDown.Width
  else if FButton <> nil then
    Result := FButton.Width
  else
    Result := DefBtnWidth;
end;

procedure TRMSpinEdit.ResizeButton;
var
  R: TRect;
begin
  if FUpDown <> nil then
  begin
    FUpDown.Width := DefBtnWidth;
{$IFDEF Delphi4}
    if (BiDiMode = bdRightToLeft) then
      FUpDown.Align := alLeft
    else
{$ENDIF}
      FUpDown.Align := alRight;
  end
  else if FButton <> nil then
  begin { bkDiagonal }
    if NewStyleControls and Ctl3D and (BorderStyle = bsSingle) then
      R := Bounds(Width - Height - 1, -1, Height - 3, Height - 3)
    else
      R := Bounds(Width - Height, 0, Height, Height);
{$IFDEF Delphi4}
    if (BiDiMode = bdRightToLeft) then
    begin
      if NewStyleControls and Ctl3D and (BorderStyle = bsSingle) then
      begin
        R.Left := -1;
        R.Right := Height - 4;
      end
      else
      begin
        R.Left := 0;
        R.Right := Height;
      end;
    end;
{$ENDIF}
    with R do
      FBtnWindow.SetBounds(Left, Top, Right - Left, Bottom - Top);
    FButton.SetBounds(0, 0, FBtnWindow.Width, FBtnWindow.Height);
  end;
end;

procedure TRMSpinEdit.KeyDown(var Key: Word; Shift: TShiftState);
begin
  inherited KeyDown(Key, Shift);
  if ArrowKeys and (Key in [VK_UP, VK_DOWN]) then
  begin
    if Key = VK_UP then
      UpClick(Self)
    else if Key = VK_DOWN then
      DownClick(Self);
    Key := 0;
  end;
end;

procedure TRMSpinEdit.Change;
begin
  if not FChanging then
    inherited Change;
end;

procedure TRMSpinEdit.KeyPress(var Key: Char);
begin
  if not IsValidChar(Key) then
  begin
    Key := #0;
    MessageBeep(0)
  end;
  if Key <> #0 then
  begin
    inherited KeyPress(Key);
    if (Key = Char(VK_RETURN)) or (Key = Char(VK_ESCAPE)) then
    begin
      { must catch and remove this, since is actually multi-line }
      GetParentForm(Self).Perform(CM_DIALOGKEY, Byte(Key), 0);
      if Key = Char(VK_RETURN) then
        Key := #0;
    end;
  end;
end;

function TRMSpinEdit.IsValidChar(Key: Char): Boolean;
var
  ValidChars: set of Char;
begin
  ValidChars := ['+', '-', '0'..'9'];
  if ValueType = rmvtFloat then
  begin
    if Pos(DecimalSeparator, Text) = 0 then
      ValidChars := ValidChars + [DecimalSeparator];
    if Pos('E', AnsiUpperCase(Text)) = 0 then
      ValidChars := ValidChars + ['e', 'E'];
  end;
  Result := (Key in ValidChars) or (Key < #32);
  if not FEditorEnabled and Result and ((Key >= #32) or
    (Key = Char(VK_BACK)) or (Key = Char(VK_DELETE))) then
    Result := False;
end;

procedure TRMSpinEdit.CreateParams(var Params: TCreateParams);
const
{$IFDEF Delphi4}
  Alignments: array[Boolean, TAlignment] of DWORD =
  ((ES_LEFT, ES_RIGHT, ES_CENTER), (ES_RIGHT, ES_LEFT, ES_CENTER));
{$ELSE}
  Alignments: array[TAlignment] of Longint = (ES_LEFT, ES_RIGHT, ES_CENTER);
{$ENDIF}
begin
  inherited CreateParams(Params);
  Params.Style := Params.Style or ES_MULTILINE or WS_CLIPCHILDREN or
{$IFDEF Delphi4}
  Alignments[UseRightToLeftAlignment, FAlignment];
{$ELSE}
  Alignments[FAlignment];
{$ENDIF}
end;

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

procedure TRMSpinEdit.SetEditRect;
var
  Loc: TRect;
begin
{$IFDEF Delphi4}
  if (BiDiMode = bdRightToLeft) then
    SetRect(Loc, GetButtonWidth + 1, 0, ClientWidth - 1,
      ClientHeight + 1)
  else
{$ENDIF}
    SetRect(Loc, 0, 0, ClientWidth - GetButtonWidth - 2, ClientHeight + 1);
  SendMessage(Handle, EM_SETRECTNP, 0, Longint(@Loc));
end;

procedure TRMSpinEdit.SetAlignment(Value: TAlignment);
begin
  if FAlignment <> Value then
  begin
    FAlignment := Value;
    RecreateWnd;
  end;
end;

procedure TRMSpinEdit.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
  begin
    ResizeButton;
    SetEditRect;
  end;
end;

procedure TRMSpinEdit.GetTextHeight(var SysHeight, Height: Integer);
var
  DC: HDC;
  SaveFont: HFont;
  SysMetrics, Metrics: TTextMetric;
begin
  DC := GetDC(0);
  GetTextMetrics(DC, SysMetrics);
  SaveFont := SelectObject(DC, Font.Handle);
  GetTextMetrics(DC, Metrics);
  SelectObject(DC, SaveFont);
  ReleaseDC(0, DC);
  SysHeight := SysMetrics.tmHeight;
  Height := Metrics.tmHeight;
end;

function TRMSpinEdit.GetMinHeight: Integer;
var
  I, H: Integer;
begin
  GetTextHeight(I, H);
  if I > H then
    I := H;
  Result := H + (GetSystemMetrics(SM_CYBORDER) * 4) + 1;
end;

procedure TRMSpinEdit.UpClick(Sender: TObject);
var
  OldText: string;
begin
  if ReadOnly then
    MessageBeep(0)
  else
  begin
    FChanging := True;
    try
      OldText := inherited Text;
      Value := Value + FIncrement;
    finally
      FChanging := False;
    end;
    if CompareText(inherited Text, OldText) <> 0 then
    begin
      Modified := True;
      Change;
    end;
    if Assigned(FOnTopClick) then
      FOnTopClick(Self);
  end;
end;

procedure TRMSpinEdit.DownClick(Sender: TObject);
var
  OldText: string;
begin
  if ReadOnly then
    MessageBeep(0)
  else
  begin
    FChanging := True;
    try
      OldText := inherited Text;
      Value := Value - FIncrement;
    finally
      FChanging := False;
    end;
    if CompareText(inherited Text, OldText) <> 0 then
    begin
      Modified := True;
      Change;
    end;
    if Assigned(FOnBottomClick) then
      FOnBottomClick(Self);
  end;
end;

{$IFDEF Delphi4}

procedure TRMSpinEdit.CMBiDiModeChanged(var Message: TMessage);
begin
  inherited;
  ResizeButton;
  SetEditRect;
end;
{$ENDIF}

procedure TRMSpinEdit.CMFontChanged(var Message: TMessage);
begin
  inherited;
  ResizeButton;
  SetEditRect;
end;

procedure TRMSpinEdit.CMCtl3DChanged(var Message: TMessage);
begin
  inherited;
  ResizeButton;
  SetEditRect;
end;

procedure TRMSpinEdit.CMEnabledChanged(var Message: TMessage);
begin
  inherited;
  if FUpDown <> nil then
  begin
    FUpDown.Enabled := Enabled;
    ResizeButton;
  end;
  if FButton <> nil then
    FButton.Enabled := Enabled;
end;

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

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

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

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

function TRMSpinEdit.GetValue: Extended;
begin
  try
    if Text <> '' then
    begin
      if ValueType = rmvtFloat then
        Result := StrToFloat(Text)
      else
        Result := StrToInt(Text);
    end
    else
      Result := 0;    
  except
    if ValueType = rmvtFloat then
      Result := FMinValue
    else
      Result := Trunc(FMinValue);
  end;
end;

procedure TRMSpinEdit.SetValue(NewValue: Extended);
begin
  if ValueType = rmvtFloat then
    Text := FloatToStrF(CheckValue(NewValue), ffFixed, 15, FDecimal)
  else
    Text := IntToStr(Round(CheckValue(NewValue)));
end;

function TRMSpinEdit.GetAsInteger: Longint;
begin
  Result := Trunc(GetValue);
end;

procedure TRMSpinEdit.SetAsInteger(NewValue: Longint);
begin
  SetValue(NewValue);
end;

procedure TRMSpinEdit.SetValueType(NewType: TRMValueType);
begin
  if FValueType <> NewType then
  begin
    FValueType := NewType;
    Value := GetValue;
    if FValueType in [rmvtInteger] then
    begin
      FIncrement := Round(FIncrement);
      if FIncrement = 0 then
        FIncrement := 1;
    end;
  end;
end;

function TRMSpinEdit.IsIncrementStored: Boolean;
begin
  Result := FIncrement <> 1.0;
end;

function TRMSpinEdit.IsValueStored: Boolean;
begin
  Result := (GetValue <> 0.0);
end;

procedure TRMSpinEdit.SetDecimal(NewValue: Byte);
begin
  if FDecimal <> NewValue then
  begin
    FDecimal := NewValue;
    Value := GetValue;
  end;
end;

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

end.