lazarus - 如何在 Delphi TStringGrid 的固定行中更改单元格中的文本方向

Question

我在表单上有一个标准的 TStringGrid。我在网格中有一个固定行，其中包含许多列，这些列都是 TGridColumns 对象。我已经使用对象检查器设置了列标题，默认方向是水平的。有什么方法可以使方向垂直（就像在 Excel 中的单元格中一样）？

Answer 1

以下是如何在 Lazarus 中垂直渲染第一行的文本：

unit Unit1; 

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, Grids,
  StdCtrls;

type
  TStringGrid = class(Grids.TStringGrid)
  protected
    procedure DrawCellText(ACol, ARow: Integer; ARect: TRect;
      AState: TGridDrawState; AText: String); override;
  end;

type
  TForm1 = class(TForm)
    Button1: TButton;
    StringGrid1: TStringGrid;
    procedure Button1Click(Sender: TObject);
  private
    { private declarations }
  public
    { public declarations }
  end; 

var
  Form1: TForm1; 

implementation

{$R *.lfm}

procedure TStringGrid.DrawCellText(ACol, ARow: Integer; ARect: TRect;
  AState: TGridDrawState; AText: String);
var
  TextPosition: TPoint;
begin
  if ARow = 0 then
  begin
    Canvas.Font.Orientation := 900;
    TextPosition.X := ARect.Left +
      ((ARect.Right - ARect.Left - Canvas.TextHeight(AText)) div 2);
    TextPosition.Y := ARect.Bottom -
      ((ARect.Bottom - ARect.Top - Canvas.TextWidth(AText)) div 2);
    Canvas.TextOut(TextPosition.X, TextPosition.Y, AText);
  end
  else
    inherited DrawCellText(ACol, ARow, ARect, AState, AText);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
  GridColumn: TGridColumn;
begin
  for I := 0 to 4 do
  begin
    GridColumn := StringGrid1.Columns.Add;
    GridColumn.Width := 24;
    GridColumn.Title.Font.Orientation := 900;
    GridColumn.Title.Layout := tlBottom;
    GridColumn.Title.Caption := 'Column no. ' + IntToStr(I);
  end;
  StringGrid1.RowHeights[0] := 80;
end;

end.

下面是如何TStringGrid在 Delphi 中垂直渲染第一行的文本：

我更喜欢使用覆盖DrawCell过程，因为在我看来它是最简单的方法，因为如果您只想在OnDrawCell事件中呈现文本，那么您应该考虑：

• 如果您将DefaultDrawing设置设置为，True则在触发事件时文本将已经呈现OnDrawCell，所以在这里我建议例如将单元格标题存储在单独的变量中，而不是存储到Cells属性中，这样就不会呈现文本，您可以垂直绘制自己存储的字幕
• 如果你有DefaultDrawing设置，False那么你必须自己绘制整个单元格，包括 3D 边框，恕我直言，这不是很酷，我个人更喜欢让控件为我们绘制背景
  

这是使用覆盖DrawCell过程的 Delphi 代码。文本在单元格矩形内居中；请注意，我没有使用DrawTextEx文本大小测量，因为此功能没有考虑更改的字体方向。

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, Grids;

type
  TStringGrid = class(Grids.TStringGrid)
  protected
    procedure DrawCell(ACol, ARow: Longint; ARect: TRect;
      AState: TGridDrawState); override;
  end;

type
  TForm1 = class(TForm)
    Button1: TButton;
    StringGrid1: TStringGrid;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TStringGrid.DrawCell(ACol, ARow: Longint; ARect: TRect;
  AState: TGridDrawState);
var
  LogFont: TLogFont;
  TextPosition: TPoint;
  NewFontHandle: HFONT;
  OldFontHandle: HFONT;
begin
  if ARow = 0 then
  begin
    GetObject(Canvas.Font.Handle, SizeOf(LogFont), @LogFont);
    LogFont.lfEscapement := 900;
    LogFont.lfOrientation := LogFont.lfEscapement;
    NewFontHandle := CreateFontIndirect(LogFont);
    OldFontHandle := SelectObject(Canvas.Handle, NewFontHandle);
    TextPosition.X := ARect.Left +
      ((ARect.Right - ARect.Left - Canvas.TextHeight(Cells[ACol, ARow])) div 2);
    TextPosition.Y := ARect.Bottom -
      ((ARect.Bottom - ARect.Top - Canvas.TextWidth(Cells[ACol, ARow])) div 2);
    Canvas.TextRect(ARect, TextPosition.X, TextPosition.Y, Cells[ACol, ARow]);
    NewFontHandle := SelectObject(Canvas.Handle, OldFontHandle);
    DeleteObject(NewFontHandle);
  end
  else
    inherited DrawCell(ACol, ARow, ARect, AState);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  I: Integer;
begin
  for I := 0 to StringGrid1.ColCount - 1 do
  begin
    StringGrid1.ColWidths[I] := 24;
    StringGrid1.Cells[I, 0] := 'Column no. ' + IntToStr(I);
  end;
  StringGrid1.RowHeights[0] := 80;
end;

end.

这是它的样子：