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Frequently Asked Questions

Changing RichEdit Font styles with HotKey combinations

Question:

How can I change the RichEdit font style in response to a dedicated keystroke combination?

Answer:

The following example demonstrates changing the font style in a
TRichEdit component the following key combinations are pressed:

Ctrl + B - Turns on and off Bold styling
Ctrl + I - Turns on and off Italic styling
Ctrl + S - Turns on and off Strikeout styling
Ctrl + U - Turns on and off Underline styling

Note: It is possible to set the font to include multiple styles.

Example:

const
  KEY_CTRL_B = 02;
  KEY_CTRL_I =  9;
  KEY_CTRL_S = 19;
  KEY_CTRL_U = 21;

procedure TForm1.RichEdit1KeyPress(Sender: TObject; var Key: Char);
begin
  case Ord(Key) of
    KEY_CTRL_B: begin
      Key := #0;
      if fsBold in (Sender as TRichEdit).SelAttributes.Style then
      (Sender as TRichEdit).SelAttributes.Style :=
        (Sender as TRichEdit).SelAttributes.Style - [fsBold] else
      (Sender as TRichEdit).SelAttributes.Style :=
        (Sender as TRichEdit).SelAttributes.Style + [fsBold];
    end;
    KEY_CTRL_I: begin
      Key := #0;
      if fsItalic in 
      (Sender as TRichEdit).SelAttributes.Style then
        (Sender as TRichEdit).SelAttributes.Style :=
        (Sender as TRichEdit).SelAttributes.Style - [fsItalic] 
      else
       (Sender as TRichEdit).SelAttributes.Style :=
       (Sender as TRichEdit).SelAttributes.Style + [fsItalic];
    end;
    KEY_CTRL_S: begin
       Key := #0;
      if fsStrikeout in 
      (Sender as TRichEdit).SelAttributes.Style then
        (Sender as TRichEdit).SelAttributes.Style :=
        (Sender as TRichEdit).SelAttributes.Style - [fsStrikeout] 
      else
        (Sender as TRichEdit).SelAttributes.Style :=
        (Sender as TRichEdit).SelAttributes.Style + [fsStrikeout];
    end;
    KEY_CTRL_U: begin
       Key := #0;
      if fsUnderline in 
      (Sender as TRichEdit).SelAttributes.Style then
        (Sender as TRichEdit).SelAttributes.Style :=
        (Sender as TRichEdit).SelAttributes.Style - [fsUnderline] 
      else
        (Sender as TRichEdit).SelAttributes.Style :=
        (Sender as TRichEdit).SelAttributes.Style + [fsUnderline];
    end;
  end;
end;

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