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///////////////////////////////////////////////////////////////////////////////
// Name: wx/msw/private/metrics.h
// Purpose: various helper functions to retrieve system metrics
// Author: Vadim Zeitlin
// Created: 2008-09-05
// Copyright: (c) 2008 Vadim Zeitlin <vadim@wxwidgets.org>
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_MSW_PRIVATE_METRICS_H_
#define _WX_MSW_PRIVATE_METRICS_H_
#include "wx/msw/private.h"
namespace wxMSWImpl
{
// return NONCLIENTMETRICS as retrieved by SystemParametersInfo()
//
// currently this is not cached as the values may change when system settings
// do and we don't react to this to invalidate the cache but it could be done
// in the future
//
// MT-safety: this function is only meant to be called from the main thread
inline const NONCLIENTMETRICS GetNonClientMetrics(const wxWindow* win)
{
WinStruct<NONCLIENTMETRICS> nm;
if ( !wxSystemParametersInfo(SPI_GETNONCLIENTMETRICS,
sizeof(NONCLIENTMETRICS),
&nm,
0,
win) )
{
#if WINVER >= 0x0600
// a new field has been added to NONCLIENTMETRICS under Vista, so
// the call to SystemParametersInfo() fails if we use the struct
// size incorporating this new value on an older system -- retry
// without it
nm.cbSize -= sizeof(int);
if ( !wxSystemParametersInfo(SPI_GETNONCLIENTMETRICS,
sizeof(NONCLIENTMETRICS),
&nm,
0,
win) )
#endif // WINVER >= 0x0600
{
// maybe we should initialize the struct with some defaults?
wxLogLastError(wxT("SystemParametersInfo(SPI_GETNONCLIENTMETRICS)"));
}
}
return nm;
}
} // namespace wxMSWImpl
#endif // _WX_MSW_PRIVATE_METRICS_H_
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