BOOL CChildView::OnEraseBkgnd(CDC* pDC)
{
CRect rect;
GetClientRect (&rect);
CPalette* pOldPalette;
if ((HPALETTE) m_palette != NULL) {
pOldPalette = pDC->SelectPalette (&m_palette, FALSE);
pDC->RealizePalette ();
}
DoGradientFill (pDC, &rect);
if ((HPALETTE) m_palette != NULL)
pDC->SelectPalette (pOldPalette, FALSE);
return TRUE;
}
void CButtonXP::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
//从lpDrawItemStruct获取控件的相关信息
CRect rect = lpDrawItemStruct->rcItem;
CDC *pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
int nSaveDC = pDC->SaveDC();
UINT state = lpDrawItemStruct->itemState;
POINT pt ;
TCHAR strText[MAX_PATH + 1];
::GetWindowText(m_hWnd, strText, MAX_PATH);
//画按钮的外边框，它是一个半径为5的圆角矩形
pt.x = 5;
pt.y = 5;
CPen* hOldPen = pDC->SelectObject(&m_BoundryPen);
pDC->RoundRect(&rect, pt);
//获取按钮的状态
if (state & ODS_FOCUS)
{
m_bFocus = TRUE;
m_bSelected = TRUE;
}
else
{
m_bFocus = FALSE;
m_bSelected = FALSE;
}
if (state & ODS_SELECTED || state & ODS_DEFAULT)
{
m_bFocus = TRUE;
}
pDC->SelectObject(hOldPen);
rect.DeflateRect(CSize(GetSystemMetrics(SM_CXEDGE), GetSystemMetrics(SM_CYEDGE)));
//根据按钮的状态填充按钮的底色
CBrush* pOldBrush;
if (m_bOver)
{
pOldBrush = pDC->SelectObject(&m_FillActive);
DoGradientFill(pDC, &rect);
}
else
{
pOldBrush = pDC->SelectObject(&m_FillInactive);
DoGradientFill(pDC, &rect);
}
//根据按钮的状态绘制内边框
if (m_bOver || m_bSelected)
DrawInsideBorder(pDC, &rect);
pDC->SelectObject(pOldBrush);
//显示按钮的文本
if (strText!=NULL)
{
CFont* hFont = GetFont();
CFont* hOldFont = pDC->SelectObject(hFont);
CSize szExtent = pDC->GetTextExtent(strText, lstrlen(strText));
CPoint pt( rect.CenterPoint().x - szExtent.cx / 2, rect.CenterPoint().y - szExtent.cy / 2);
if (state & ODS_SELECTED)
pt.Offset(1, 1);
int nMode = pDC->SetBkMode(TRANSPARENT);
if (state & ODS_DISABLED)
pDC->DrawState(pt, szExtent, strText, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL);
else
pDC->DrawState(pt, szExtent, strText, DSS_NORMAL, TRUE, 0, (HBRUSH)NULL);
pDC->SelectObject(hOldFont);
pDC->SetBkMode(nMode);
}
pDC->RestoreDC(nSaveDC);
}
