Question

如何更改MFC按钮的背景色

Answer 1

通过重绘CButton类。

主要思路：先把按钮属性OwerDraw设置成true

然后覆写CButton类的DrawItem虚函数。

 void CCustomButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	CRect rect;
	GetClientRect(rect);
	CDC dc;
	dc.Attach(lpDrawItemStruct->hDC);
	
	UINT state = lpDrawItemStruct->itemState;
	
        //绘制处于焦点的按钮 
	COLORREF colorFocus(RGB(0, 128, 0));
	CPen penFocus(PS_DASHDOTDOT, 2, colorFocus);
	CBrush brushFocus;
        
         //绘制普通按钮  
	COLORREF color(RGB(0, 128, 255));
	CPen pen(PS_DASHDOTDOT, 2, RGB(0, 128, 255));
	CBrush brush;
	if ((state & ODS_SELECTED) || (state & ODS_FOCUS)) {
		brushFocus.CreateSolidBrush(colorFocus);
		dc.SelectObject(&brushFocus);
		dc.SelectObject(&penFocus);
		dc.FillSolidRect(rect,m_bgColor);
		dc.RoundRect(rect, CPoint(20, 20));
	} else {
		brush.CreateSolidBrush(color);
		dc.SelectObject(&brush);
		dc.SelectObject(&pen);
		dc.FillSolidRect(rect, m_bgColor);
		dc.RoundRect(rect, CPoint(20, 40));
	}
	
	CString strText;
	GetWindowText(strText);
	dc.SetBkMode(TRANSPARENT);
	dc.SetTextColor(m_textColor);
    
        // 绘制不可按的按钮  
	COLORREF colorDisable(RGB(128, 128, 128));
	CBrush brushDisable;
	brushDisable.CreateSolidBrush(colorDisable);
	CPen penDisable(PS_DASHDOTDOT, 2, colorDisable);
	if (state & ODS_DISABLED) {
		dc.SelectObject(penDisable);
		dc.SelectObject(brushDisable);
		dc.RoundRect(rect, CPoint(20, 40));
	}
	dc.SetTextColor(RGB(255, 255, 255));
	dc.DrawText(strText, rect, DT_CENTER | DT_SINGLELINE | DT_VCENTER);
	dc.Detach();
}