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added ClassRegistrar (wraps Register/UnregisterClass Win32 API calls)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31657 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2005-01-30 16:57:57 +00:00
parent 8cfa09bdab
commit 77ec05d477
1 changed files with 64 additions and 6 deletions
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70
include/wx/msw/private.h
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@ -54,6 +54,12 @@ extern WXDLLEXPORT_DATA(HFONT) wxSTATUS_LINE_FONT;
#endif // wxUSE_GUI
// ---------------------------------------------------------------------------
// global data
// ---------------------------------------------------------------------------
extern WXDLLIMPEXP_DATA_BASE(HINSTANCE) wxhInstance;
// ---------------------------------------------------------------------------
// define things missing from some compilers' headers
// ---------------------------------------------------------------------------
@ -451,6 +457,64 @@ private:
DECLARE_NO_COPY_CLASS(GlobalPtr)
};
// register the class when it is first needed and unregister it in dtor
class ClassRegistrar
{
public:
// ctor doesn't register the class, call Initialize() for this
ClassRegistrar() { m_registered = -1; }
// return true if the class is already registered
bool IsInitialized() const { return m_registered != -1; }
// return true if the class had been already registered
bool IsRegistered() const { return m_registered == 1; }
// try to register the class if not done yet, return true on success
bool Register(const WNDCLASS& wc)
{
// we should only be called if we hadn't been initialized yet
wxASSERT_MSG( m_registered == -1,
_T("calling ClassRegistrar::Register() twice?") );
m_registered = ::RegisterClass(&wc) ? 1 : 0;
if ( !IsRegistered() )
{
wxLogLastError(_T("RegisterClassEx()"));
}
else
{
m_clsname = wc.lpszClassName;
}
return m_registered == 1;
}
// get the name of the registered class (returns empty string if not
// registered)
const wxString& GetName() const { return m_clsname; }
// unregister the class if it had been registered
~ClassRegistrar()
{
if ( IsRegistered() )
{
if ( !::UnregisterClass(m_clsname, wxhInstance) )
{
wxLogLastError(_T("UnregisterClass"));
}
}
}
private:
// initial value is -1 which means that we hadn't tried registering the
// class yet, it becomes true or false (1 or 0) when Initialize() is called
int m_registered;
// the name of the class, only non empty if it had been registered
wxString m_clsname;
};
// ---------------------------------------------------------------------------
// macros to make casting between WXFOO and FOO a bit easier: the GetFoo()
// returns Foo cast to the Windows type for oruselves, while GetFooOf() takes
@ -498,12 +562,6 @@ private:
#endif // wxUSE_GUI
// ---------------------------------------------------------------------------
// global data
// ---------------------------------------------------------------------------
extern WXDLLIMPEXP_DATA_BASE(HINSTANCE) wxhInstance;
// ---------------------------------------------------------------------------
// global functions
// ---------------------------------------------------------------------------