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Transparent checkbox? |
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znakeeye 
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Joined: 26 July 2006 Status: Offline Points: 1672 |
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 Topic: Transparent checkbox?Posted: 26 March 2007 at 9:12am |
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I have a CWnd-derived window with a black background. Inside this window, I have a checkbox (CButton) with the WS_EX_TRANSPARENT style set. Of course, the rectangle of this checkbox is excluded in CMyWindow::OnPaint, using ExcludeClipRect.
Why does my checkbox look like this? How do I make it transparent?
 Thanks!
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Oleg
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Joined: 21 May 2003 Location: United States Status: Offline Points: 11234 |
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Posted: 26 March 2007 at 10:36am |
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Hi,
in MSDN see WM_CTLCOLOR description/sample.
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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS |
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znakeeye
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Joined: 26 July 2006 Status: Offline Points: 1672 |
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Posted: 26 March 2007 at 12:04pm |
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Hi, The problem is that WM_CTLCOLOR is not received. I've tried to capture WM_CTLCOLORBTN too, with no success. Here is my code:
In the message map of my CWnd-derived class: ON_WM_CTLCOLOR()
CMyDerivedWnd::Create(...):
m_button.CreateEx(WS_EX_TRANSPARENT, _T("BUTTON"), _T("&Transparency?"), WS_VISIBLE | WS_CHILD | WS_CLIPCHILDREN | WS_CLIPSIBLINGS | BS_CHECKBOX, rcButton, this, IDC_MYBUTTON);
HBRUSH CMyDerivedWnd::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{ // Never called... could this be due to the BS_CHECKBOX style?
return CWnd::OnCtlColor(pDC, pWnd, nCtlColor); } Any ideas? What am I missing here?
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Oleg
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Joined: 21 May 2003 Location: United States Status: Offline Points: 11234 |
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Posted: 27 March 2007 at 1:14am |
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Hi,
WM_CTLCOLOR is sent to parent of button. In button you can catch reflected message:
ON_WM_CTLCOLOR_REFLECT()
HBRUSH CMyDerivedWnd::CtlColor(CDC* pDC, UINT nCtlColor)
{ } |
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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS |
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znakeeye
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Joined: 26 July 2006 Status: Offline Points: 1672 |
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Posted: 27 March 2007 at 9:22am |
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I've done some testing, and it seems that WM_CTLCOLOR is only sent to the parent window if it has been created from a dialog resource. My CWnd-derived class does not receive this message. Do you know the cause of this?
Anyway, I will try your solution, though I did not want to create another button class
 .Thanks for your advice!
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znakeeye
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Posted: 29 March 2007 at 3:24am |
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It's not working :(. Even if I subclass CButton and override WM_CTLCOLOR, as you described, I do not get this message. Neither is it handled in CMyWindow::PreTranslateMessage.
WM_CTLCOLOR is not sent to the parent window. What can be the reason for this? This is what I know:
1) My parent window is a modeless dialog (most of the code was taken from CColorSelectorCtrl).
2) My check box is created dynamically in CMyWindow::Create(...).
To reproduce this, all you need to do is adding a check box in the color picker control and then try making it transparent.
Any ideas? Thanks.
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Oleg
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Joined: 21 May 2003 Location: United States Status: Offline Points: 11234 |
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Posted: 29 March 2007 at 4:05am |
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Hi,
Attach modified project and I will point what you do wrong.
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Oleg, Support Team
CODEJOCK SOFTWARE SOLUTIONS |
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