Transparent RichEditCtrl

256 colors


Environment: VC5, NT4 SP3

CRichEditCtrlEx is derived from CRichEditCtrl and contains two methods for create the control.

The background of a rich control could be changed using SetBackgroundColor() method. When the display has 256 colors the RGB value from SetBackgroundColor() method is converted into an apropiate color from system palette. So I created a pattern brush with the desired RGB value with I filled the control in OnErasebkgnd() method. I have also treated the invalidate message because the control being transparent didn't actualize itself.

The first image is taken from a 256 color display adapter and the second from a 16 bit one.

The method MsgFilterRich() is used for treatment the mouse or key events.


Download demo project - 23 KB


  • Transparency While The Window is Hidden

    Posted by Legacy on 05/02/2003 12:00am

    Originally posted by: TDS

    My Problem is I Want Text From The RichEditCtrl While the Window is Hidden With Transparent Backgrnd.
    For this Problem I Had Used Ur Code But While The Window is Hidden WM_PAINT Mesage Gets Posted Continously To The Parent Window .

  • Could you tell me my mistake? Please~

    Posted by Legacy on 08/01/2001 12:00am

    Originally posted by: Moon Joon Sik

    error C2440: 'initializing' : cannot convert from 'class std::list<class CString,class std::allocator<class CString> >::const_iterator' to 'class std::list<class CString,class std::allocator<class
    CString> >::iterator'

    This is an error message. I don't know why error occur. Please teach me~ Have a good time~ Bye~

  • Transparency in RichEdit2

    Posted by Legacy on 04/08/2001 12:00am

    Originally posted by: Anton Riabov

    Rich edit 2.0 (and higher) can be made transparent with WS_EX_TRANSPARENT style, and any kind of background can be put under it with minimal flickering, as long as parent window redraws only the modified rectangle. Hope this helps.

  • Flicker on scroll

    Posted by Legacy on 08/12/1999 12:00am

    Originally posted by: Bob Cozzi

    The knowledge that we can use the transparent style is great. I've needed to draw (water mark style) for a long time.

    The problem is that when I use the transparent style, the scroll feature causes a mud slide. The text smears across the screen while it is scrolled, and never recovers.

    To resolve this I have to update the entire window, but the problem is, the Erase background routine causes the entire RichEdit control to blink. This is not acceptable. :(

    Redraw(FALSE) doesn't work and I can't seem to get at the RichEdit control's ITextDocument to try to do a Freeze() method. Very close, but for me it isn't working good enough. :( Any Ideas?

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