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    <p>I think this question is asked very often (maybe not here, but I have seen it many times before). The strange thing is, the answer almost never comes up although it is there, hidden among all people discussing the question. Maybe the question here will help improve the search process in the future, simply because it's stackoverflow :-)</p> <p>Anyway, here is the answer I found last year (see code below). Not mine, but works for me - link to <a href="http://proger.i-forge.net/RichEdit_with_transparent_background_in_Delphi_Hell_yes/OVP" rel="nofollow">author</a>. Essentially, the code defines a derived richedit with custom event handler for the WM_ERASEBACKGROUND message.</p> <pre><code>unit TransparentRichEdit; { Component made by Proger_XP | http://Proger.i-Forge.net } interface uses Windows, Messages, SysUtils, Classes, Controls, StdCtrls, ComCtrls, Graphics; type TTransparentRichEdit = class (TRichEdit) protected FCanvas: TCanvas; FBackground: TPicture; procedure CreateWnd; override; procedure WMEraseBkgnd(var Message: TWMEraseBkgnd); message WM_ERASEBKGND; procedure SetBackground(const Value: TPicture); public constructor Create(AOwner: TComponent); override; destructor Destroy; override; published property Background: TPicture read FBackground write SetBackground; end; procedure Register; implementation procedure Register; begin RegisterComponents('Miscellaneous', [TTransparentRichEdit]); end; { TTransparentRichEdit } constructor TTransparentRichEdit.Create(AOwner: TComponent); begin inherited; FCanvas := TCanvas.Create; FBackground := TPicture.Create; end; destructor TTransparentRichEdit.Destroy; begin FBackground.Free; FCanvas.Free; inherited; end; procedure TTransparentRichEdit.CreateWnd; begin inherited; SetWindowLong(Handle, GWL_EXSTYLE, GetWindowLong(Handle, GWL_EXSTYLE) or WS_EX_TRANSPARENT); end; procedure TTransparentRichEdit.WMEraseBkgnd(var Message: TWMEraseBkgnd); var UpdateRect: TRect; Rgn: HRGN; ToBeErased: Boolean; Mem: TBitmap; begin ToBeErased:= false; Mem := TBitmap.Create; try Mem.Width := ClientWidth; Mem.Height := ClientHeight; FCanvas.Handle := Message.DC; Message.Result := 1; if not GetUpdateRect(Handle, UpdateRect, ToBeErased) then UpdateRect := Rect(0, 0, ClientWidth, ClientHeight); with UpdateRect do Rgn := CreateRectRgn(Left, Top, Right, Bottom); SelectClipRgn(FCanvas.Handle, Rgn); FCanvas.Draw(0, 0, FBackground.Graphic); finally Mem.Free; end; end; procedure TTransparentRichEdit.SetBackground(const Value: TPicture); begin FBackground.Assign(Value); Repaint; end; end. </code></pre>
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    1. POVCL component Opacity/transparence
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    1. USSpaghettiCook
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    1. COForgot to mention, this approach should also work for TMemo's, etc.
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    2. COI do not want to make bg completly transparent, i want to make it 60-70% or so, this is the problem.
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      1. USuser2200585
    3. CO@user2200585, you should look at the way a normal form handles transparency aka AlphaBlend.
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      1. USPeter
 

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