Mega Code Archive
How to use Subscript or Superscript in a TRichEdit
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Title: How to use Subscript or Superscript in a TRichEdit
// yOffset values
type
TCharacterFormat = (CFM_Superscript, CFM_Subscript, CFM_Normal);
procedure RE_SetCharFormat(RichEdit: TRichEdit; CharacterFormat: TCharacterFormat);
var
// The CHARFORMAT structure contains information about
// character formatting in a rich edit control.
Format: TCharFormat;
begin
FillChar(Format, SizeOf(Format), 0);
with Format do
begin
cbSize := SizeOf(Format);
dwMask := CFM_OFFSET;
// Character offset, in twips, from the baseline.
// If the value of this member is positive,
// the character is a superscript;
// if it is negative, the character is a subscript.
case CharacterFormat of
CFM_Superscript: yOffset := 60;
CFM_Subscript: yOffset := -60;
CFM_Normal: yOffset := 0;
end;
end;
// The EM_SETCHARFORMAT message sets character formatting in a rich edit control.
// SCF_SELECTION: Applies the formatting to the current selection
Richedit.Perform(EM_SETCHARFORMAT, SCF_SELECTION, Longint(@Format));
end;
// Examples:
// Beispiele:
// Apply Superscript to the current selection
// Markierte Zeichen hoch stellen
procedure TForm1.Button1Click(Sender: TObject);
begin
RE_SetCharFormat(RichEdit1, CFM_Superscript);
end;
// Apply Subscript to the current selection
// Markierte Zeichen tief stellen
procedure TForm1.Button2Click(Sender: TObject);
begin
RE_SetCharFormat(RichEdit1, CFM_Subscript);
end;
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