How to draw a bitmap on top of button?
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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
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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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?
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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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
Naveen R wrote:
CButton::OnPaint();
Should not call base class. :)
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Naveen R wrote:
CButton::OnPaint();
Should not call base class. :)
Prasad Notifier using ATL | Operator new[],delete[][^]
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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
It doesn't have any effect there.
Prasad Notifier using ATL | Operator new[],delete[][^]
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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) { CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct); HDC thdc = CreateCompatibleDC(lpDrawItemStruct->hDC); HGDIOBJ tobj = SelectObject(thdc, LoadBitmap(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_ARROW_DOWN))); 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)); SelectObject(thdc, tobj); DeleteDC(thdc); }if i exclude "CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);" then code works, but there is no borders and caption text, just my bitmap.Have you see this?
"Approved Workmen Are Not Ashamed" - 2 Timothy 2:15
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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) { CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct); HDC thdc = CreateCompatibleDC(lpDrawItemStruct->hDC); HGDIOBJ tobj = SelectObject(thdc, LoadBitmap(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_ARROW_DOWN))); 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)); SelectObject(thdc, tobj); DeleteDC(thdc); }if i exclude "CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);" then code works, but there is no borders and caption text, just my bitmap. -
WhiteSky wrote:
See A Better Bitmap Button Class[^] if helpfuls
i liked it sometime before
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cheers, Alok Gupta VC Forum Q&A :- I/ IV Support CRY- Child Re
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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
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_PAINTmessage is meant to paint invalidated area. Now about calling base classOnPaint. It simply does default painting routines and validates invalidated area. So Consider this function,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
}Consider another scenario,
void CMyButton::OnPaint()
{
CPaintDC dc(this); // device context for painting
//drawing routine follows
//till this point due to call toCPaintDCc'tor
invalidated area will be validated and
CButton::OnPaint has no effect.
CButton::OnPaint();//}
Hope this clears your doubts.
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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_PAINTmessage is meant to paint invalidated area. Now about calling base classOnPaint. It simply does default painting routines and validates invalidated area. So Consider this function,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
}Consider another scenario,
void CMyButton::OnPaint()
{
CPaintDC dc(this); // device context for painting
//drawing routine follows
//till this point due to call toCPaintDCc'tor
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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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
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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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) { CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct); HDC thdc = CreateCompatibleDC(lpDrawItemStruct->hDC); HGDIOBJ tobj = SelectObject(thdc, LoadBitmap(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_ARROW_DOWN))); 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)); SelectObject(thdc, tobj); DeleteDC(thdc); }if i exclude "CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);" then code works, but there is no borders and caption text, just my bitmap.OK thank you all for your answers, i will try it out and let you know if it's woking. In case my english is so bad that nobody understood what i want to do :), I want to draw something like this http://img252.imageshack.us/img252/2254/codeprojectkc1.png
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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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I will try.
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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
Naveen R wrote:
I never said to create another CPaintDC below the CButton::OnPaint();
Yes, but it is what should be used in
OnPaintmessages.CClientDCassociated with whole client area of window, as opposed toCPaintDCwhich is associated to invalidated rect only. So consider how logical is it to useCClientDCthere. BTW,havn't you come across this line whenever addedWM_PAINTmessage handler throught class wizard ? // Do not call CButton::OnPaint() for painting messagesPrasad Notifier using ATL | Operator new[],delete[][^]
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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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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) { CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct); HDC thdc = CreateCompatibleDC(lpDrawItemStruct->hDC); HGDIOBJ tobj = SelectObject(thdc, LoadBitmap(AfxGetInstanceHandle(), MAKEINTRESOURCE(IDB_ARROW_DOWN))); 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)); SelectObject(thdc, tobj); DeleteDC(thdc); }if i exclude "CDialog::OnDrawItem(nIDCtl, lpDrawItemStruct);" then code works, but there is no borders and caption text, just my bitmap.CImageButton class is very lousy way of replacing API function DrawFrameControl and i definitely don't need that... All that code is easily replaced with these 4 lines of code: CPaintDC dc(this); CRect rc; GetClientRect(&rc); dc.DrawFrameControl(&rc, DFC_BUTTON, DFCS_BUTTONPUSH); http://img214.imageshack.us/img214/6206/drawingfx6.png
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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
I tried that already, look at this picture http://img214.imageshack.us/img214/6206/drawingfx6.png It draws button but without XP styles...
