CRichEditCtrl Subclass to add resize handle??

Question

CRichEditCtrl Subclass to add resize handle??

Andre LeBlanc 21

I am trying to subclass the CRichEditCtrl class in MFC. When overriding the OnPaint function no text shows while typing and artifacts appear - happens when CPaintDC is defined. When the CPAintDC is commented out and base class CRichEditCtrl::OnPaint() is called, everything works as default. I'm trying to draw a resize handle on the right edge of the rectangle/border. Please help!!!

Minxin Yu 13,516 Reputation points Microsoft External Staff

2022-08-05T06:51:16.367+00:00

How did you create the subclass? Can you provide the necessary code.

draw a resize handle

Is this something like a scroll bar to control the size?

Andre LeBlanc 21

Thanks for the response. I used class wizard to add a new MFC class - base class: CRichEditCtrl. Added PreSubclassWindow. This is my OnPaint method:

void CRichEdit::OnPaint()  
{  
	  
  
	CPaintDC dc(this); // device context for painting  
					   // TODO: Add your message handler code here  
					   // Do not call CRichEditCtrl::OnPaint() for painting messages  
	  
  
//	CRichEditCtrl::OnPaint();  
		  
	CRect rect;  
	GetClientRect(&rect);  
  
	int  xCenter = rect.left + rect.Width() / 2;  
	int yCenter = rect.top + rect.Height() / 2;  
  
	int x = rect.right - 7;  
	int y = yCenter - 7;  
  
	CRect rc(CPoint(x, y), CSize(14, 14));  
  
	CBrush brush;  
	brush.CreateSolidBrush(RGB(0, 0, 0));  
	CBrush* oldBrush = (CBrush*)dc.SelectObject(&brush);  
  
	dc.Rectangle(rc);  
	dc.FillRect(rc, &brush);  
  
	  
	ReleaseDC(&dc);  
	  
}

And this is the result when typing characters in the box:

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Minxin Yu 13,516 Reputation points Microsoft External Staff

2022-08-05T06:51:16.367+00:00

How did you create the subclass? Can you provide the necessary code.

draw a resize handle

Is this something like a scroll bar to control the size?
Andre LeBlanc 21 Reputation points

2022-08-05T10:19:55.53+00:00

Thanks for the response. I used class wizard to add a new MFC class - base class: CRichEditCtrl. Added PreSubclassWindow. This is my OnPaint method:

void CRichEdit::OnPaint() { CPaintDC dc(this); // device context for painting // TODO: Add your message handler code here // Do not call CRichEditCtrl::OnPaint() for painting messages // CRichEditCtrl::OnPaint(); CRect rect; GetClientRect(&rect); int xCenter = rect.left + rect.Width() / 2; int yCenter = rect.top + rect.Height() / 2; int x = rect.right - 7; int y = yCenter - 7; CRect rc(CPoint(x, y), CSize(14, 14)); CBrush brush; brush.CreateSolidBrush(RGB(0, 0, 0)); CBrush* oldBrush = (CBrush*)dc.SelectObject(&brush); dc.Rectangle(rc); dc.FillRect(rc, &brush); ReleaseDC(&dc); }

And this is the result when typing characters in the box:

Answer 1

Minxin Yu 13,516 Microsoft External Staff

Hi, @Andre LeBlanc

Try to paint in WM_NCPAINT event. It is also needed to remove OnPaint and redraw edit border.

Best regards,

Minxin Yu

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Minxin Yu 13,516 Reputation points Microsoft External Staff

2022-08-11T05:34:20.097+00:00

Hi, @Andre LeBlanc
Was your problem sloved?

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CRichEditCtrl Subclass to add resize handle??

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