1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
///////////////////////////////////////////////////////////////////////////////
// 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_
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()
{
static WinStruct<NONCLIENTMETRICS> nm;
if ( !::SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &nm, 0) )
{
#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 ( !::SystemParametersInfo(SPI_GETNONCLIENTMETRICS, 0, &nm, 0) )
#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_
|
