CDateTimeCtrl background

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  If you're taking about the Edit part, a way is to subclass it and handle WM_PAINT (WM_PRINT + TransparentBlt for example to change the background color)

  A test :

  

  Thursday, July 9, 2020 11:45 AM
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   Yes thank you,But i am using DTS_UPDOWN  spin buttons for  CDateTimeCtrl  and i wouldlike to set background color for it also.Can you help me in it 

  Thursday, July 9, 2020 5:19 PM
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  It is the same thing with  DTS_UPDOWN :

  

  Thursday, July 9, 2020 5:36 PM
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  Hi,

  But WM_PAINT only seems to work for window of picker and it skips the spin button while painting.

  Thursday, July 9, 2020 5:59 PM
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  The spin button is a child Up-down Control that you can paint too

  Test :

  

  • Proposed as answer by Naomi N Thursday, July 9, 2020 7:29 PM

  Thursday, July 9, 2020 7:19 PM
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  Can you share me the strip of code  showing how you did that .That would be a great help

  Friday, July 10, 2020 2:35 AM
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  I tested quickly in a C++/ Win32 app

  I subclassed the controls, handled WM_PAINT only, where I replaced colors with this function (I modified it a bit for the Up-down Control as colors are not uniform)=>

  (can also be done with TransparentBlt to avoid the DIB section)

  void ReplaceColor(HWND hWnd, COLORREF nOldColor, COLORREF nNewColor)
  {
  	RECT rect;
  	GetWindowRect(hWnd, &rect);
  	MapWindowPoints(NULL, hWnd, (LPPOINT)&rect, 2);
  	long nWidth = rect.right - rect.left, nHeight = rect.bottom - rect.top;
  	HDC hDC = GetDC(hWnd);
  	HDC hDCMem = CreateCompatibleDC(hDC);
  	
  	int nX = nWidth, nY = nHeight;
  	BITMAPINFO bi = { 0 };
  	bi.bmiHeader.biSize = sizeof(bi.bmiHeader);
  	bi.bmiHeader.biWidth = nX;
  	bi.bmiHeader.biHeight = nY;
  	bi.bmiHeader.biPlanes = 1;
  	bi.bmiHeader.biBitCount = 32;
  	bi.bmiHeader.biCompression = BI_RGB;
  	BYTE *pbBitmap;
  	HBITMAP hBitmap = CreateDIBSection(hDCMem, &bi, DIB_RGB_COLORS, (void**)&pbBitmap, NULL, 0);
  	if (hBitmap)
  	{
  		HBITMAP hBitmapOld = (HBITMAP)SelectObject(hDCMem, hBitmap);
  		SendMessage(hWnd, WM_PRINT, (WPARAM)hDCMem, PRF_CLIENT | PRF_CHILDREN | PRF_NONCLIENT);
  		RGBQUAD *pRGB;
  		LONG nPixels;
  		int nPixelX = 0, nPixelY = 0;
  		for (pRGB = (RGBQUAD *)pbBitmap, nPixels = nX * nY; nPixels > 0; ++pRGB, --nPixels)
  		{
  			ULONG* pSrc = (ULONG*)pRGB;
  			ULONG nRed = GetRValue(*pSrc);
  			ULONG nGreen = GetGValue(*pSrc);
  			ULONG nBlue = GetBValue(*pSrc);
  			if (nRed == GetRValue(nOldColor) && nGreen == GetGValue(nOldColor) && nBlue == GetBValue(nOldColor))
  			{
  				pRGB->rgbRed = GetRValue(nNewColor);
  				pRGB->rgbGreen = GetGValue(nNewColor);
  				pRGB->rgbBlue = GetBValue(nNewColor);
  			}
  		}
  		BitBlt(hDC, rect.left, rect.top, nWidth, nHeight, hDCMem, 0, 0, SRCCOPY);
  		SelectObject(hDCMem, hBitmapOld);
  		DeleteObject(hBitmap);
  	}
  	DeleteDC(hDCMem);
  	ReleaseDC(hWnd, hDC);
  }

  
  

  
  
  

  • Edited by Castorix31 Friday, July 10, 2020 6:04 AM

  Friday, July 10, 2020 5:59 AM
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  Thank you for previous solution.

  Is it possible to change width of spin button.If we can can you show how.

  Friday, July 10, 2020 9:11 AM
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  Thank you for previous solution.

  Is it possible to change width of spin button.If we can can you show how.

  Like for any control, with APIs like SetWindowPos

  , after having got its handle (I used GetWindow(hDTP, GW_CHILD)) :

  

  Friday, July 10, 2020 9:24 AM
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  I tried it but it doesn't seems to work as i want .The icon disappears too .Do you know any other approach.

  Saturday, July 11, 2020 1:19 PM
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  I tried it but it doesn't seems to work as i want .The icon disappears too .Do you know any other approach.

  Which icon ?

  You can see in the picture that I could increase the width of the Up-down control with SetWindowPos

  (I moved it to left too, as the size is bigger)
  

  • Edited by Castorix31 Saturday, July 11, 2020 1:40 PM

  Saturday, July 11, 2020 1:25 PM
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  Yes ,sizing worked well.

  The setting of background color to spin buttons seems to make the icon disappear .

  Can you tell me some other approach to it .

  Saturday, July 11, 2020 2:32 PM
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  I don't see which icon you're talking about
  
  The DateTimePicker control has the Up-Down control as child, which draws arrows with DrawThemeBackground or DrawFrameControl,
  (that I colored in red above for the tests, either the background or the arrows, by replacing colors with the ReplaceColor function)

  Saturday, July 11, 2020 5:01 PM
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  Hi ,

  I mighthave gone through it wrongly.I am not sure about the subclassing and directly set background in WM_PAINT.Can you show the subclassing concept too.

  Thank you

  Sunday, July 12, 2020 9:25 AM
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  There is nothing different from what I posted, I just handle WM_PAINT
  
  For example, for the DTP control (same thing for the Up-Down control, with another ReplaceColor function to change colors differently) =>

  BOOL bRet = SetWindowSubclass(hDTP, DTPSubclassProc, 0, 0);

  
  

  LRESULT CALLBACK DTPSubclassProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam, UINT_PTR uIdSubclass, DWORD_PTR dwRefData)
  {
  	switch (uMsg)
  	{
  		case WM_PAINT:
  		{
  			PAINTSTRUCT ps;
  			BeginPaint(hWnd, &ps);	
  			// White => Green
  			//ReplaceColor(hWnd, RGB(255, 255, 255), RGB(0, 255, 0));
  			ReplaceColor(hWnd, GetSysColor(COLOR_WINDOW), RGB(0, 255, 0));
  			EndPaint(hWnd, &ps);
  			return 0;
  		}
  		break;
  	}
  	return DefSubclassProc(hWnd, uMsg, wParam, lParam);
  }

  
  

  
  

  • Edited by Castorix31 Sunday, July 12, 2020 11:20 AM
  • Proposed as answer by Tianyu Sun-MSFTMicrosoft contingent staff Tuesday, July 21, 2020 8:11 AM

  Sunday, July 12, 2020 11:20 AM