Author: Tomas Rutkauskas
I need to right-align text in certain cells of a TStringGrid. How can I do that?
Answer:
Solve 1:
1
2 procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
3 Rect: TRect; State: TGridDrawState);
4 var
5 dx: integer;
6 Text: string;
7 begin
8 if aCol in [1..2] then {If column is 1 or 2, then right-align text}
9 with StringGrid1.Canvas do
10 begin
11 FillRect(Rect);
12 Text := StringGrid1.cells[aCol, aRow];
13 dx := TextWidth(Text) + 2;
14 TextOut(Rect.Right - dx, Rect.Top, Text);
15 end;
16 end;
Solve 2:
17
18 procedure TForm1.StringGrid1DrawCell(Sender: TObject; ACol, ARow: Integer;
19 Rect: TRect; State: TGridDrawState);
20 const
21 CharOffset = 3;
22 var
23 fLeft: Integer;
24 begin
25 {Right justify column 3}
26 if (ACol = 3) then
27 begin
28 with TStringGrid(Sender) do
29 begin
30 Canvas.FillRect(Rect);
31 fLeft := Rect.Right - Canvas.TextWidth(Cells[ACol, ARow]);
32 Canvas.TextOut(fleft - CharOffset, Rect.Top + CharOffset, Cells[ACol, ARow]);
33 end;
34 end;
35 end;
Solve 3:
The following code aligns the strings of the first column in a TStringGrid to the
right:
36
37 procedure DrawTheText(ACanvas: TCanvas; ARect: TRect;
38 AValue: string; AAlign: TAlignment);
39 var
40 horzOffset: integer;
41 options: integer;
42 vertOffset: integer;
43 begin
44 {Note: The Handle property of TCanvas is the handle of its DC.}
45 with ACanvas do
46 begin
47 vertOffset := ARect.Top + (((ARect.Bottom - ARect.Top) -
48 TextExtent(AValue).CY) div 2);
49 horzOffset := TextExtent('Mi').CX div 4;
50 {Yields rougly the width of an "average" character}
51 options := ETO_CLIPPED or ETO_OPAQUE;
52 case AAlign of
53 taLeftJustify:
54 begin
55 SetTextAlign(Handle, TA_LEFT or TA_TOP or TA_NOUPDATECP);
56 ExtTextOut(Handle, ARect.Left + horzOffset, vertOffset, options,
57 @ARect, PChar(AValue), Length(AValue), nil);
58 end;
59 taRightJustify:
60 begin
61 SetTextAlign(Handle, TA_RIGHT or TA_TOP or TA_NOUPDATECP);
62 ExtTextOut(Handle, ARect.Right - horzOffset, vertOffset, options,
63 @ARect, PChar(AValue), Length(AValue), nil);
64 end;
65 taCenter:
66 begin
67 horzOffset := ((ARect.Right - ARect.Left) - TextExtent(AValue).CX) div 2;
68 SetTextAlign(Handle, TA_LEFT or TA_TOP or TA_NOUPDATECP);
69 ExtTextOut(Handle, ARect.Left + horzOffset, vertOffset, options,
70 @ARect, PChar(AValue), Length(AValue), nil);
71 end;
72 end;
73 end;
74 end;
75
76 procedure TFrmAlignText.StringGridDrawCell(Sender: TObject; Col, Row: Integer;
77 Rect: TRect; State: TGridDrawState);
78 var
79 align: TAlignment;
80 theText: string;
81 thisRect: TRect;
82 begin
83 {Assumes that DefaultDrawing := true}
84 theText := IntToStr(Col) + ':' + IntToStr(Row);
85 align := taLeftJustify;
86 {Select background color}
87 if gdSelected in State then
88 StringGrid.Canvas.Brush.Color := clHighlight
89 else if gdFixed in State then
90 StringGrid.Canvas.Brush.Color := clBtnFace
91 else
92 StringGrid.Canvas.Brush.Color := clWindow;
93 {Determine font/text attributes}
94 StringGrid.Canvas.Font.Color := clBlack;
95 StringGrid.Canvas.Font.Style := StringGrid.Canvas.Font.Style - [fsBold];
96 if Col = 1 then
97 begin
98 align := taRightJustify;
99 StringGrid.Canvas.Font.Style := StringGrid.Canvas.Font.Style + [fsBold];
100 StringGrid.Canvas.Font.Color := clRed;
101 StringGrid.Canvas.Font.Name := 'Courier New';
102 end
103 else if Col = 2 then
104 begin
105 align := taCenter;
106 StringGrid.Canvas.Font.Style := StringGrid.Canvas.Font.Style + [fsBold]
107 end
108 else if (Row = 0) and (Col = 0) then
109 begin
110 StringGrid.Canvas.Draw(Rect.Left + 2, Rect.Top + 2, Image.Picture.Graphic);
111 end;
112 if not ((Row = 0) and (Col = 0)) then
113 DrawTheText(StringGrid.Canvas, Rect, theText, align);
114 {Draw focus rectangle}
115 if gdFocused in State then
116 StringGrid.Canvas.DrawFocusRect(Rect);
117 if gdFixed in State then
118 Frame3D(StringGrid.Canvas, Rect, clWindow, clHighlight, 1);
119 end;
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