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Change font color, size, style, and back color of certain words inside a rich edit (Views: 715)

Problem/Question/Abstract:

Do you want to have a nice looking rich edit?

Answer:

This procedure will search and change the attributes (font name, font size, font color, font style, and back color) of certain words inside a rich edit control.  Try the example.

type
TTextAttributes = record
Font: TFont;
BackColor: TColor;
end;
{..}

procedure SetTextColor(oRichEdit: TRichEdit; sText: string; rAttributes:
TTextAttributes);
var
iPos: Integer;
iLen: Integer;

Format: CHARFORMAT2;
begin
FillChar(Format, SizeOf(Format), 0);
Format.cbSize := SizeOf(Format);
Format.dwMask := CFM_BACKCOLOR;
Format.crBackColor := rAttributes.BackColor;

iPos := 0;
iLen := Length(oRichEdit.Lines.Text);
iPos := oRichEdit.FindText(sText, iPos, iLen, []);

while iPos <> -1 do
begin
oRichEdit.SelStart := iPos;
oRichEdit.SelLength := Length(sText);
oRichEdit.SelAttributes.Color := rAttributes.Font.Color;
oRichEdit.SelAttributes.Size := rAttributes.Font.Size;
oRichEdit.SelAttributes.Style := rAttributes.Font.Style;
oRichEdit.SelAttributes.Name := rAttributes.Font.Name;

oRichEdit.Perform(EM_SETCHARFORMAT, SCF_SELECTION, Longint(@Format));

iPos := oRichEdit.FindText(sText, iPos + Length(sText), iLen, []);
end;
end;

Example:

var
rAttrib: TTextAttributes;
begin
rAttrib.Font := TFont.Create;
rAttrib.Font.Color := clWhite;
rAttrib.Font.Size := 16;
rAttrib.Font.Style := [fsBold];
rAttrib.BackColor := clRed;

SetTextColor(RichEdit1, 'Delphi', rAttrib);

//Change another word attributes.
rAttrib.Font.Color := clYellow;
rAttrib.Font.Size := 10;
rAttrib.Font.Style := [fsBold, fsItalic];
rAttrib.BackColor := clBlue;

SetTextColor(RichEdit1, 'Is greate', rAttrib);

rAttrib.Font.Free; //Now free the font.
end;

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