Help with component and function

Hello Guys,

I am really in doubts how to do this:

Please, take a look at my function

procedure ChangeWordColor(RE: TrichEdit; TheWord: String; Color: TColor; Style: TFontStyles);
var
  i, CharPos, noChars: Integer;
  cmp : TComponent;
begin
  CharPos := 0;
  noChars := 0;
  for i := 0 to Pred(cmp.Lines.Count) do
  Begin
    noChars := noChars + Length(RE.Lines[i]);
    CharPos := RE.FindText(TheWord, CharPos, noChars, [stWholeWord]);
    RE.SelStart := CharPos;
    RE.SelLength := Length(TheWord);

    if RE.SelAttributes.Color = clRed then
    Begin
      RE.SelAttributes.Color := color;
      RE.SelAttributes.Style := Style;
    End;
  End;
end;

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I would like to turn this function able to use some kind of richedit that I have as component in my delphi, today, this
function only accept TrichEdit, but I have

* TsRichEdit
* TwwdbRichEdit
* TrxRichEdit
* TRichEdit

I thought to change the parameter to

ChangeWordColor(RE: Tcomponent ; TheWord: String; Color: TColor; Style: TFontStyles);

But I didn't how to go on inside the procedure.

I need a help so I can learn how to.

thanks
LVL 1
hidrauAsked:
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ThommyConnect With a Mentor Commented:
I know that TrxRichEdit like TRichEdit derives from TCustomRichEdit.

So you can at least use TrxRichEdit and TRichEdit together with my above posted procedure passing a TCustomRichEdit and using the same Find/Replace coding...
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ThommyCommented:
Simply use Overloading to pass different RichEdit types...

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ComCtrls;

type
  TForm1 = class(TForm)
    RichEdit1          : TRichEdit;
    sRichEdit           : TsRichEdit;
    wwdbRichEdit1: TwwdbRichEdit
    rxRichEdit1       : TrxRichEdit1;
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

 procedure ChangeWordColor(RE: TRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;
 procedure ChangeWordColor(RE: TsRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;
 procedure ChangeWordColor(RE: TrxRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;
 procedure ChangeWordColor(RE: TwwdbRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;

implementation


procedure ChangeWordColor(RE: TRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;
begin
   ...
end;

procedure ChangeWordColor(RE: TsRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;
begin
   ...
end;

procedure ChangeWordColor(RE: TrxRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;
begin
   ...
end;

procedure ChangeWordColor(RE: TwwdbRichEdit; TheWord: String; Color: TColor; Style: TFontStyles);overload;
begin
   ...
end;

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hidrauAuthor Commented:
hummm,

I have thought about it but I think that was another way to do that where I could have only one function.

is there any other way? Something like:

if Re is TrichEdit them cmp := TRichEdit(re)

where I could have a variable where could assume the component that I am passing.

did you get it?
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Sinisa VukCommented:
I think that this won't work because some richedit components (like RichView) are not inherited from original one. If they are (at least you use) - then it is possible.
Why not use only one TRichEdit component or one which suits you best?
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hidrauAuthor Commented:
I understood what you told me Sinisa, but all component that I use it seems to come from the same.

TsrichEdit comes from AlphaSkins component
TwwdbRichEdit comes from infopower component

Well, I only use two kind, TsrichEdit that inherited the original one and wwdbRichEdit that I am not sure now.

But to do something generic, how would it be? This is that I'd like to know that is, if it is possible.
You can give an example with any function and I adapt here on mine.
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ThommyCommented:
if all your RichEdit components inherit from TCustomRichEdit, then you can do as below:

Procedure ChangeWordColor2(RE:TCustomRichEdit;TheWord:string; TheColor: TColor; TheStyle: TFontStyles);
Var
FoundAt : integer;
len: integer;
start_pos: integer;
begin
    start_pos:=0;
    len:=RE.GetTextLen - Start_Pos;
    FoundAt:=RE.FindText(TheWord,start_pos,len,[stWholeWord]);
    while FoundAt <> -1 do
    begin
      RE.SelStart := FoundAt;
      RE.SelLength := Length(TheWord);
//      if RE.SelAttributes.Color = clRed then Begin
        RE.SelAttributes.Style := TheStyle;
        RE.SelAttributes.Color := TheColor;
        RE.SelText :=TheWord;
//      End;
      start_pos:=RE.SelStart+RE.SelLength;
      len:=RE.GetTextLen - Start_Pos;
      FoundAt:=RE.FindText(TheWord,start_pos,len,[]);
    end;
end;

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hidrauAuthor Commented:
hummm, this is the secret TCustomRichEdit, I was doing wrong in my function parameter.

I got it Thommy, thanks a lot.
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