Question

mfc中怎么改变按钮上文字的颜色如图

比如电脑上计算器的红色怎么弄？

Answer 1

1，新建类，继承自CButton ； //class CButtonNewx : public CButton
2，重载新类的DrawItem函数

void CButtonNewx::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
// TODO: Add your code to draw the specified item
UINT uStyle = DFCS_BUTTONPUSH;

// This code only works with buttons.
ASSERT(lpDrawItemStruct->CtlType == ODT_BUTTON);

// If drawing selected, add the pushed style to DrawFrameControl.
if (lpDrawItemStruct->itemState & ODS_SELECTED)
uStyle |= DFCS_PUSHED;

// Draw the button frame.
::DrawFrameControl(lpDrawItemStruct->hDC, &lpDrawItemStruct->rcItem,
DFC_BUTTON, uStyle);

// Get the button's text.
CString strText;
GetWindowText(strText);

// Draw the button text using the text color red.
COLORREF crOldColor = ::SetTextColor(lpDrawItemStruct->hDC, RGB(255,0,0));
::DrawText(lpDrawItemStruct->hDC, strText, strText.GetLength(),
&lpDrawItemStruct->rcItem, DT_SINGLELINE|DT_VCENTER|DT_CENTER);
::SetTextColor(lpDrawItemStruct->hDC, crOldColor);
}
3，按钮选择 Owner Draw；
4，类向导中对按钮新建成员变量，类型选择新类CButtonNewx m_butok;