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Newbie00 wrote: [Message Deleted]
message deletion is crime here!
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and you
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ThatsAlok wrote: message deletion is crime here!
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I've deleted the message because it wasn't worth seeing. I didn't understand David's reply properly ("validating" --> now I know what it really means :]), and I wrote rubbishy post.
ThatsAlok wrote: message deletion is crime here!
Shall I burn on the balefire....
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Newbie00 wrote: hall I burn on the balefire....
he he he
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
Support CRY- Child Relief and you
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I want to draw a small arrow bitmap on top of already drawn button. I tried with calling default drawing proc before my code for drawing bitmap but it gives me some error.
OnDrawItem(int nIDCtl, LPDRAWITEMSTRUCT lpDrawItemStruct)<br />
{<br />
CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);<br />
<br />
HDC thdc = CreateCompatibleDC(lpDrawItemStruct->hDC);<br />
HGDIOBJ tobj = SelectObject(thdc, LoadBitmap(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_ARROW_DOWN)));<br />
TransparentBlt(lpDrawItemStruct->hDC, lpDrawItemStruct->rcItem.right - 20, lpDrawItemStruct->rcItem.top + (lpDrawItemStruct->rcItem.bottom - lpDrawItemStruct->rcItem.top - 16) / 2, 16, 16, thdc, 0, 0, 16, 16, RGB(255, 0, 255));<br />
SelectObject(thdc, tobj);<br />
DeleteDC(thdc);<br />
}
if i exclude "CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);" then code works, but there is no borders and caption text, just my bitmap.
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Igor Jerosimic wrote: but it gives me some error.
Whats the error?
After making the button owner draw, you have to draw the entire button your self. the DrawItem() function of CButton only contains Assert(FALSE);, which will result in a Abort-Retry--Ignore dialog.
nave
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It stops on some ASSERT...
I know that i have to draw the entire button by myself, but my question is how do i let windows draw that button for me (with al it's visual styles) and i just want to draw small bitmap in right corner of button?
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why dont u use CBitmapButton?
Another way is to handle the WM_PAINT message of the button and draw the bitmap after the default paint.For this you need to derive a class from CButton and make control variable of button of this class type.I am not sure about this technique.
eg:
void CMyBotton::OnPaint()
{
CButton::OnPaint();
// Draw the bitmap
}
nave
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Naveen R wrote: CButton::OnPaint();
Should not call base class. 
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prasad_som wrote: Should not call base class
why?
I said him to do so in a non owner draw button.
nave
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It doesn't have any effect there.
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prasad_som wrote: It doesn't have any effect there.
Whats do you mean. If I didnt called the default procedure for WM_PAINT, then how will the button get painted? Nothing will appear in the place of button. Isn't it?
nave
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Naveen R wrote: Whats do you mean. If I didnt called the default procedure for WM_PAINT, then how will the button get painted?
You are confusing between painting a control and drawing a control.
In case of of non-owner drawn control windows takes care of drawing/creating control. WM_PAINT message is meant to paint invalidated area.
Now about calling base class OnPaint. It simply does default painting routines and validates invalidated area.
So Consider this function,
void CMyButton::OnPaint()
{
CButton::OnPaint();
and code following has no effect
CPaintDC dc(this);
}
Consider another scenario,
void CMyButton::OnPaint()
{
CPaintDC dc(this);
invalidated area will be validated and
CButton::OnPaint has no effect.
CButton::OnPaint();
}
Hope this clears your doubts.
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prasad_som wrote: void CMyButton::OnPaint(){ CButton::OnPaint();// //Here at above line invlaidated client area will be validated and code following has no effect CPaintDC dc(this); // device context for painting //drawing routine follows}
I never said to create another CPaintDC below the CButton::OnPaint(); He can use CClientDC dc(this) to create a device context and do painting to it. Surely it will work.
nave
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I already tried something with WM_PAINT, but it didn't work. And after reading this article in MSDN i give up on WM_PAINT...
"Handling WM_PAINT
The most extreme choice is to implement a WM_PAINT handler and do all the painting yourself."
http://msdn2.microsoft.com/en-us/library/ms364048(vs.80).aspx
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Why dont you use the class CBitmapButton???
nave
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Can you explain how do you think that i should use CBitmapButton class? As i see that class only helps in inserting bitmaps on to buttons, but it still needs me to draw the button (because my bitmap is displayed only on one small portion of button).
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that's a problem  .. I will tell you another way.
Make the button owner draw, in the DrawItem Function,do as follows
DrawItem()
{
DrawFrameControl();// This function will draw a statndard button.
// here , draw your bitmap
}
nave
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OK thanks, this looks like something i needed.
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I did it, it works now, thank you.
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nave
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Naveen R wrote: I never said to create another CPaintDC below the CButton::OnPaint();
Yes, but it is what should be used in OnPaint messages.
CClientDC associated with whole client area of window, as opposed to CPaintDC which is associated to invalidated rect only.
So consider how logical is it to use CClientDC there.
BTW,havn't you come across this line whenever added WM_PAINT message handler throught class wizard ?
// Do not call CButton::OnPaint() for painting messages
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