CMFCHeaderCtrl 调用当前活动的可视化管理器来实际绘制排序箭头。很容易实现一个自定义的可视化管理器,它覆盖了基类中的箭头绘制方法。
class CMyVisualManager:public CMFCVisualManagerOffice2007
{
virtual void OnDrawHeaderCtrlSortArrow(CMFCHeaderCtrl* pCtrl, CDC* pDC, CRect& rect, BOOL bIsUp);
};
void CMyVisualManager::OnDrawHeaderCtrlSortArrow(CMFCHeaderCtrl* pCtrl, CDC* pDC, CRect& rectArrow, BOOL bIsUp)
{
BOOL bDlgCtrl = pCtrl->IsDialogControl();
CPen penDark(PS_SOLID, 1, bDlgCtrl ? afxGlobalData.clrBtnDkShadow : afxGlobalData.clrBarDkShadow);
CPen* pPenOld = pDC->SelectObject(&penDark);;
ASSERT_VALID(pPenOld);
if (!bIsUp)
{
pDC->MoveTo(rectArrow.CenterPoint().x, rectArrow.bottom);
pDC->LineTo(rectArrow.CenterPoint().x, rectArrow.top);
pDC->MoveTo(rectArrow.CenterPoint().x-2, rectArrow.top+4);
pDC->LineTo(rectArrow.CenterPoint().x+3, rectArrow.top+4);
pDC->MoveTo(rectArrow.CenterPoint().x-1, rectArrow.top+3);
pDC->LineTo(rectArrow.CenterPoint().x+2, rectArrow.top+3);
pDC->MoveTo(rectArrow.CenterPoint().x-1, rectArrow.top+2);
pDC->LineTo(rectArrow.CenterPoint().x+2, rectArrow.top+2);
}
else
{
pDC->MoveTo(rectArrow.CenterPoint().x, rectArrow.top);
pDC->LineTo(rectArrow.CenterPoint().x, rectArrow.bottom);
pDC->MoveTo(rectArrow.CenterPoint().x-2, rectArrow.bottom-4);
pDC->LineTo(rectArrow.CenterPoint().x+3, rectArrow.bottom-4);
pDC->MoveTo(rectArrow.CenterPoint().x-1, rectArrow.bottom-3);
pDC->LineTo(rectArrow.CenterPoint().x+2, rectArrow.bottom-3);
pDC->MoveTo(rectArrow.CenterPoint().x-1, rectArrow.bottom-2);
pDC->LineTo(rectArrow.CenterPoint().x+2, rectArrow.bottom-2);
}
pDC->SelectObject(pPenOld);
}