| Код |
BOOL CenterWindow(HWND hWndCenter = NULL)
{
ATLASSERT(::IsWindow(m_hWnd));
// determine owner window to center against
DWORD dwStyle = GetStyle();
if(hWndCenter == NULL)
{
if(dwStyle & WS_CHILD)
hWndCenter = ::GetParent(m_hWnd);
else
hWndCenter = ::GetWindow(m_hWnd, GW_OWNER);
}
// get coordinates of the window relative to its parent
RECT rcDlg;
::GetWindowRect(m_hWnd, &rcDlg);
RECT rcArea;
RECT rcCenter;
HWND hWndParent;
if(!(dwStyle & WS_CHILD))
{
// don't center against invisible or minimized windows
if(hWndCenter != NULL)
{
DWORD dwStyle = ::GetWindowLong(hWndCenter, GWL_STYLE);
if(!(dwStyle & WS_VISIBLE) || (dwStyle & WS_MINIMIZE))
hWndCenter = NULL;
}
// center within screen coordinates
::SystemParametersInfo(SPI_GETWORKAREA, NULL, &rcArea, NULL);
if(hWndCenter == NULL)
rcCenter = rcArea;
else
::GetWindowRect(hWndCenter, &rcCenter);
}
else
{
// center within parent client coordinates
hWndParent = ::GetParent(m_hWnd);
ATLASSERT(::IsWindow(hWndParent));
::GetClientRect(hWndParent, &rcArea);
ATLASSERT(::IsWindow(hWndCenter));
::GetClientRect(hWndCenter, &rcCenter);
::MapWindowPoints(hWndCenter, hWndParent, (POINT*)&rcCenter, 2);
}
int DlgWidth = rcDlg.right - rcDlg.left;
int DlgHeight = rcDlg.bottom - rcDlg.top;
// find dialog's upper left based on rcCenter
int xLeft = (rcCenter.left + rcCenter.right) / 2 - DlgWidth / 2;
int yTop = (rcCenter.top + rcCenter.bottom) / 2 - DlgHeight / 2;
// if the dialog is outside the screen, move it inside
if(xLeft < rcArea.left)
xLeft = rcArea.left;
else if(xLeft + DlgWidth > rcArea.right)
xLeft = rcArea.right - DlgWidth;
if(yTop < rcArea.top)
yTop = rcArea.top;
else if(yTop + DlgHeight > rcArea.bottom)
yTop = rcArea.bottom - DlgHeight;
// map screen coordinates to child coordinates
return ::SetWindowPos(m_hWnd, NULL, xLeft, yTop, -1, -1,
SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
}
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