transparent static control and display icon

hi, i want to make my static control transparent, so it will draw transsparent background with text.
and i want to have a transparent static where i can display my icon.

i can set the WS_EX_TRANSPARENT but that does not make it transparent yet?

Did you try using SetBkMode?

http://msdn.microsoft.com/en-us/libr...62(VS.85).aspx

If you are using MFC you could do something like:

Code:

---

if(CTLCOLOR_STATIC == nCtlColor)
{
        pDC->SetBkMode(TRANSPARENT);
        return (HBRUSH)GetStockObject(NULL_BRUSH);
}

---

http://msdn.microsoft.com/en-us/library/0wwk06hc.aspx

Best Wishes,
-David Delaune

Randor has a start, but there is more to it.

You need to set the back mode and color, then copy the bitmap to a monochrome. Using that monochrome bitmap as a mask, you then can paint a seemingly transparent background by just painting the rest of the bitmap.

There are hundreds of threads on this subject in this forum, just do a search.

-Erik

i dont use MFC (this is the winapi forum not VC++ forum)

WS_EX_TRANSPARENT and SetBkMode seems to work fine.

now i just need to use DrawIcon... should i put it in WM_PAINT

Quote:

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Originally Posted by cj-wijtmans

i dont use MFC (this is the winapi forum not VC++ forum)

WS_EX_TRANSPARENT and SetBkMode seems to work fine.

now i just need to use DrawIcon... should i put it in WM_PAINT

---

My apologies, I am generally on codeproject.com and have only recently signed up here and have not become familiar with the codeguru forum peculiars and layout.

Yes, the WM_PAINT would be the correct location for calling DrawIcon. If you are concerned with flicker then perhaps you could experiment with disabling the WM_ERASEBKGND message by returning 1 or adding WS_CLIPCHILDREN to the parent window.

Best Wishes,
-David Delaune

i already have the WS_CLIPCHILDREN flag set i wont have to handle the ERASEBKGND msg?

i tried drawing the icon there but it does not work it does not show up.

Code:

---

                        PAINTSTRUCT ps = {0};
                        HDC hdc = ::BeginPaint(Handle(), &ps);
                        ::DrawIcon(hdc, 0, 0, Arrow);
            ::EndPaint(Handle(), &ps);

---

Quote:

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Originally Posted by cj-wijtmans

i already have the WS_CLIPCHILDREN flag set i wont have to handle the ERASEBKGND msg?

---

WS_CLIPCHILDREN on the parent window will cause it to exclude the child when redrawing. Don't worry about the WM_ERASEBKGND message unless you have flicker issues that you want to resolve.

Quote:

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Originally Posted by cj-wijtmans

i tried drawing the icon there but it does not work it does not show up.

---

Have you invalidated the area associated with your static control? Try calling InvalidateRect on the client coordinates of the static.

http://msdn.microsoft.com/en-us/libr...03(VS.85).aspx
http://msdn.microsoft.com/en-us/libr...93(VS.85).aspx

Best Wishes,
-David Delaune

thanks alot for your help :thumb:

Quote:

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Originally Posted by Randor

WS_CLIPCHILDREN on the parent window will cause it to exclude the child when redrawing.

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Even if control has WS_EX_TRANSPARENT style?

Quote:

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Originally Posted by VladimirF

Even if control has WS_EX_TRANSPARENT style?

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Yes, even if the static control has the WS_EX_TRANSPARENT style. When the parent window is redrawn it will clip the child if the parent has the WS_CLIPCHILDREN flag.


By default, the windows affected by RedrawWindow depend on whether the specified window has the WS_CLIPCHILDREN style. Child windows that are not the WS_CLIPCHILDREN style are unaffected; non-WS_CLIPCHILDREN windows are recursively validated or invalidated until a WS_CLIPCHILDREN window is encountered.


http://msdn.microsoft.com/en-us/libr...00(VS.85).aspx

Best Wishes,
-David Delaune

If you want all of your static controls be transparent you can use the same method that mentioned in post 2 but for win32 API, especially for dialog box:

Code:

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case WM_CTLCOLORSTATIC:
    SetBkMode ( (HDC)wParam, TRANSPARENT);
    return (BOOL)hbrush;

---

Quote:

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Originally Posted by Randor

Yes, even if the static control has the WS_EX_TRANSPARENT style. When the parent window is redrawn it will clip the child if the parent has the WS_CLIPCHILDREN flag.

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Then who draws the background under WS_EX_TRANSPARENT controls?

i think WS_EX_TRANSPARENT will tell the parent window to draw the area behind the child first even if WS_CLIPCHILDREN is set

Quote:

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Originally Posted by cj-wijtmans

i think WS_EX_TRANSPARENT will tell the parent window to draw the area behind the child first even if WS_CLIPCHILDREN is set

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That was my point :)

Quote:

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Originally Posted by VladimirF

Then who draws the background under WS_EX_TRANSPARENT controls?

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You are correct. I knew you were baiting me when you posted the response so I took the bait. The background is painted behind the child window and therefore non-clipped during the parent window painting. However during the recursive invalidation the child window is excluded/clipped.

Best Wishes,
-David Delaune