caac3a4f19
A small optimization to avoid resolving this function dynamically every time it is needed and just do it once, on first use.
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/msw/private/dpiaware.h
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// Purpose: AutoSystemDpiAware class
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// Author: Maarten Bent
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// Created: 2016-10-06
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// Copyright: (c) Maarten Bent
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_MSW_DPI_AWARE_H_
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#define _WX_MSW_DPI_AWARE_H_
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#ifndef WX_PRECOMP
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#include "wx/msw/missing.h"
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#endif
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#include "wx/dynlib.h"
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#if wxUSE_DYNLIB_CLASS
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namespace wxMSWImpl
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{
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// ----------------------------------------------------------------------------
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// Temporarily change the DPI Awareness context to GDIScaled or System
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// ----------------------------------------------------------------------------
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class AutoSystemDpiAware
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{
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#define WXDPI_AWARENESS_CONTEXT_UNAWARE ((WXDPI_AWARENESS_CONTEXT)-1)
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#define WXDPI_AWARENESS_CONTEXT_SYSTEM_AWARE ((WXDPI_AWARENESS_CONTEXT)-2)
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#define WXDPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED ((WXDPI_AWARENESS_CONTEXT)-5)
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typedef WXDPI_AWARENESS_CONTEXT
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(WINAPI *SetThreadDpiAwarenessContext_t)(WXDPI_AWARENESS_CONTEXT);
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public:
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AutoSystemDpiAware()
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: m_prevContext(WXDPI_AWARENESS_CONTEXT_UNAWARE)
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{
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if ( ms_pfnSetThreadDpiAwarenessContext == (SetThreadDpiAwarenessContext_t)-1)
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{
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wxLoadedDLL dllUser32("user32.dll");
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wxDL_INIT_FUNC(ms_pfn, SetThreadDpiAwarenessContext, dllUser32);
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}
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if ( ms_pfnSetThreadDpiAwarenessContext )
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{
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m_prevContext = ms_pfnSetThreadDpiAwarenessContext(
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WXDPI_AWARENESS_CONTEXT_UNAWARE_GDISCALED);
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if ( !m_prevContext )
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{
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m_prevContext = ms_pfnSetThreadDpiAwarenessContext(
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WXDPI_AWARENESS_CONTEXT_SYSTEM_AWARE);
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}
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}
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}
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~AutoSystemDpiAware()
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{
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if ( ms_pfnSetThreadDpiAwarenessContext )
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{
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ms_pfnSetThreadDpiAwarenessContext(m_prevContext);
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}
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}
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private:
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WXDPI_AWARENESS_CONTEXT m_prevContext;
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// This static member is defined in src/msw/window.cpp.
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static SetThreadDpiAwarenessContext_t ms_pfnSetThreadDpiAwarenessContext;
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};
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#else // !wxUSE_DYNLIB_CLASS
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// Just a stub to avoid littering the code with wxUSE_DYNLIB_CLASS checks.
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class AutoSystemDpiAware { };
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#endif // wxUSE_DYNLIB_CLASS/!wxUSE_DYNLIB_CLASS
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} // namespace wxMSWImpl
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#endif // _WX_MSW_DPI_AWARE_H_
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