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