Delphi:如何使TStringGrid中心的单元格文本对齐？

Question

这似乎是显而易见的.我希望文本位于单元格的中心,但由于某种原因,我无法在属性中找到它.我怎样才能做到这一点？

Answer 1

在TStringGrid中没有将文本居中的属性,但您可以在DrawCell事件中执行此操作:

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;

我从这里发布的代码

更新:

在单元格中写入时居中文本,将此代码添加到 GetEditText事件:

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

这是一个比其他解决方案更好的解决方案，在程序上存在错误TStringGrid.SetCellsAlignment，TStringGrid.SetCellsAlignment比较(-1 < Index)是正确的，但是then零件else被交换了......正确的版本（这个）将显示当索引大于-1时它将覆盖存储的值，否则它将添加一个新条目，其他人将执行相反的操作，从索引消息中取出列表，感谢您检测到此类内容。

我还使得能够全部位于另一个单独的单元中，所以这里是（希望现在它是正确的，并感谢您检测到此类错误类型）：

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.

这是一个完整的单元，将其保存到一个名为AlignedTStringGrid.pas.

然后，在任何形式上，您都可以在接口使用子句的末尾添加一个TStringGrid添加。,AlignedTStringGrid

注意：可以对行执行相同的操作，但目前我不知道如何混合两者（列和行），因为如何选择优先级，如果有人对此非常感兴趣，请告诉我。

PD：对于 TEdit 也可以实现相同的想法，只需在 stackoverflow.com 上搜索TEdit.CreateParams或阅读帖子How to set textalignment in TEdit control