Delphi: How to make cells' texts in TStringGrid center aligned? - delphi

Question

It seems something obvious to have. I want the texts to be in the center of the cells, but for some reason I can't find it in properties. How can I do this?

Answer 1

There's no property to center the text in TStringGrid, but you can do that at DrawCell event as:
procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
Rect: TRect; State: TGridDrawState);
var
S: string;
SavedAlign: word;
begin
if ACol = 1 then begin // ACol is zero based
S := StringGrid1.Cells[ACol, ARow]; // cell contents
SavedAlign := SetTextAlign(StringGrid1.Canvas.Handle, TA_CENTER);
StringGrid1.Canvas.TextRect(Rect,
Rect.Left + (Rect.Right - Rect.Left) div 2, Rect.Top + 2, S);
SetTextAlign(StringGrid1.Canvas.Handle, SavedAlign);
end;
end;
The code I posted from here
UPDATE:
to center text while writing in the cell, add this code to GetEditText Event:
procedure TForm1.StringGrid1GetEditText(Sender: TObject; ACol, ARow: Integer;
var Value: string);
var
S : String;
I: Integer;
IE : TInplaceEdit ;
begin
for I := 0 to StringGrid1.ControlCount - 1 do
if StringGrid1.Controls[i].ClassName = 'TInplaceEdit' then
begin
IE := TInplaceEdit(StringGrid1.Controls[i]);
ie.Alignment := taCenter
end;
end;

Answer 2

This one is a much better solution that the others and on them there was a mistype on procedures TStringGrid.SetCellsAlignment and TStringGrid.SetCellsAlignment the (-1 < Index) compare was correct, but then and else parts were swapped... The correct version (this one) will show that when index is bigger than -1 it will overwrite value stored else it will add a new entry, the others will do just the oposite bringing a list out of index message, thanks for detecting such.
I have also make able to be all in another separated unit, so here it is (hope now it is correct and thanks for detecting such mistypes):
unit AlignedTStringGrid;
interface
uses Windows,SysUtils,Classes,Grids;
type
TStringGrid=class(Grids.TStringGrid)
private
FCellsAlignment:TStringList;
FColsDefaultAlignment:TStringList;
function GetCellsAlignment(ACol,ARow:Integer):TAlignment;
procedure SetCellsAlignment(ACol,ARow:Integer;const Alignment:TAlignment);
function GetColsDefaultAlignment(ACol:Integer):TAlignment;
procedure SetColsDefaultAlignment(ACol:Integer;const Alignment:TAlignment);
protected
procedure DrawCell(ACol,ARow:Longint;ARect:TRect;AState:TGridDrawState);override;
public
constructor Create(AOwner:TComponent);override;
destructor Destroy;override;
property CellsAlignment[ACol,ARow:Integer]:TAlignment read GetCellsAlignment write SetCellsAlignment;
property ColsDefaultAlignment[ACol:Integer]:TAlignment read GetColsDefaultAlignment write SetColsDefaultAlignment;
end;
implementation
constructor TStringGrid.Create(AOwner:TComponent);
begin
inherited Create(AOwner);
FCellsAlignment:=TStringList.Create;
FCellsAlignment.CaseSensitive:=True;
FCellsAlignment.Sorted:=True;
FCellsAlignment.Duplicates:=dupIgnore;
FColsDefaultAlignment:=TStringList.Create;
FColsDefaultAlignment.CaseSensitive:=True;
FColsDefaultAlignment.Sorted:=True;
FColsDefaultAlignment.Duplicates:=dupIgnore;
end;
destructor TStringGrid.Destroy;
begin
FCellsAlignment.Free;
FColsDefaultAlignment.Free;
inherited Destroy;
end;
procedure TStringGrid.SetCellsAlignment(ACol,ARow: Integer; const Alignment: TAlignment);
var
Index:Integer;
begin
if (-1 < Index) then begin
FCellsAlignment.Objects[Index]:= TObject(Alignment);
end else begin
FCellsAlignment.AddObject(IntToStr(ACol) + '-' + IntToStr(ARow), TObject(Alignment));
end;
end;
function TStringGrid.GetCellsAlignment(ACol,ARow: Integer): TAlignment;
var
Index:Integer;
begin
Index:= FCellsAlignment.IndexOf(IntToStr(ACol)+'-'+IntToStr(ARow));
if (-1 < Index) then begin
GetCellsAlignment:= TAlignment(FCellsAlignment.Objects[Index]);
end else begin
GetCellsAlignment:= ColsDefaultAlignment[ACol];
end;
end;
procedure TStringGrid.SetColsDefaultAlignment(ACol: Integer; const Alignment: TAlignment);
var
Index:Integer;
begin
Index:= FColsDefaultAlignment.IndexOf(IntToStr(ACol));
if (-1 < Index) then begin
FColsDefaultAlignment.Objects[Index]:= TObject(Alignment);
end else begin
FColsDefaultAlignment.AddObject(IntToStr(ACol), TObject(Alignment));
end;
end;
function TStringGrid.GetColsDefaultAlignment(ACol:Integer):TAlignment;
var
Index:Integer;
begin
Index:= FColsDefaultAlignment.IndexOf(IntToStr(ACol));
if (-1 < Index) then begin
GetColsDefaultAlignment:= TAlignment(FColsDefaultAlignment.Objects[Index]);
end else begin
GetColsDefaultAlignment:=taLeftJustify;
end;
end;
procedure TStringGrid.DrawCell(ACol,ARow:Longint;ARect:TRect;AState:TGridDrawState);
var
Old_DefaultDrawing:Boolean;
begin
if DefaultDrawing then begin
case CellsAlignment[ACol,ARow] of
taLeftJustify: begin
Canvas.TextRect(ARect,ARect.Left+2,ARect.Top+2,Cells[ACol,ARow]);
end;
taRightJustify: begin
Canvas.TextRect(ARect,ARect.Right -2 -Canvas.TextWidth(Cells[ACol,ARow]), ARect.Top+2,Cells[ACol,ARow]);
end;
taCenter: begin
Canvas.TextRect(ARect,(ARect.Left+ARect.Right-Canvas.TextWidth(Cells[ACol,ARow]))div 2,ARect.Top+2,Cells[ACol,ARow]);
end;
end;
end;
Old_DefaultDrawing:= DefaultDrawing;
DefaultDrawing:=False;
inherited DrawCell(ACol,ARow,ARect,AState);
DefaultDrawing:= Old_DefaultDrawing;
end;
end.
This is a whole unit, save it to a file called AlignedTStringGrid.pas.
Then on any form you have a TStringGrid add ,AlignedTStringGrid at the end of the interface uses clause.
Note: The same can be done for rows, but for now I do not know how to mix both (cols and rows) because of how to select priority, if anyone is very interested on it let me know.
P.D.: The same idea is possible to be done for TEdit, just search on stackoverflow.com for TEdit.CreateParams or read post How to set textalignment in TEdit control