Codejock Developer Community : Transparent CXTButton? http://forum.codejock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Wed, 22 Apr 2026 01:26:44 +0000 Mon, 20 Apr 2009 16:05:43 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 forum.codejock.com/RSS_post_feed.asp?TID=13975 <![CDATA[Codejock Developer Community]]> http://forum.codejock.com/forum_images/codejock-logo.gif http://forum.codejock.com/ <![CDATA[Transparent CXTButton? : Icon or bitmap (HBITMAP)? I have...]]> http://forum.codejock.com/forum_posts.asp?TID=13975&PID=48170&title=transparent-cxtbutton#48170 Author: rdhd
Subject: 13975
Posted: 20 April 2009 at 4:05pm

Icon or bitmap (HBITMAP)? I have a button subclassed from CXTButton that loads an HBITMAP from a resource file. f you have an HBITMAP, you can do the following:
 

BITMAP bm = {0};

::GetObject( m_hbmImage, sizeof(bm), &bm );

CBitmap bmpIcon;

bmpIcon.Attach(m_hbmImage);

CSize iconSize(bm.bmWidth, bm.bmHeight);

// convert the bitmap to a transparent icon.

HICON hIcon = CXTPTransparentBitmap(bmpIcon).ConvertToIcon();

CXTPImageManagerIconHandle hIconHandle; // do not set equal to hIcon here or it will NOT destrory the icon

hIconHandle = hIcon; // Will call DestoyIcon;

SetIcon(iconSize, hIconHandle, CXTPImageManagerIconHandle(), FALSE);

m_hbmImage = NULL; // consumed and then deleted by bmpIcon in the CBitmap dtor that runs when this block of code goes out of scope.

By default, pixel(0,0) is considered the background color that drives transparency. I once posted a question as to whether there was a way to specifically set the background color so the first pixel is not used and Oleg said there was. Unfortunately I don't recall what the member or method is but you can probably search the forum to find his answer (probably just find all my posts and his replies).

If you actually have an icon, you should be able to use one of the SetIcon overloads (perhaps the one that takes in a CXTPImageManagerIcon, which has various member methods for loading your image). For instance I have some code that loads a bitmap from a file on disk and I do this:

BOOL bAlphaBitmap = FALSE;

HBITMAP hbmMenuItem = CXTPImageManagerIcon::LoadBitmapFromFile( lpszImageFileName, &bAlphaBitmap );

]]> Mon, 20 Apr 2009 16:05:43 +0000 http://forum.codejock.com/forum_posts.asp?TID=13975&PID=48170&title=transparent-cxtbutton#48170 <![CDATA[Transparent CXTButton? : Hi, I am trying to create a CXTButton...]]> http://forum.codejock.com/forum_posts.asp?TID=13975&PID=47770&title=transparent-cxtbutton#47770 Author: yenjonat
Subject: 13975
Posted: 10 April 2009 at 1:25pm

Hi,

I am trying to create a CXTButton that uses an icon with a transparent background.  Is there an easy way to do this?  I feel like there should be, but that I'm just missing something really simple. 
]]> Fri, 10 Apr 2009 13:25:09 +0000 http://forum.codejock.com/forum_posts.asp?TID=13975&PID=47770&title=transparent-cxtbutton#47770