synchronize GTK2 minimum version in docs

[wxWidgets.git] / include / wx / msw / uxtheme.h

diff --git a/include/wx/msw/uxtheme.h b/include/wx/msw/uxtheme.h
index aa03f8522e7f42bdbfa3186c604890f7a450c312..934fbb2949d4c73152a19a7d649f084a24b9d365 100644 (file)
--- a/include/wx/msw/uxtheme.h
+++ b/include/wx/msw/uxtheme.h
@@ -17,6 +17,74 @@
 #include "wx/msw/private.h"     // we use GetHwndOf()
 #include "wx/msw/uxthemep.h"
 
+// Amazingly, GetThemeFont() and GetThemeSysFont() functions use LOGFONTA under
+// XP but LOGFONTW (even in non-Unicode build) under later versions of Windows.
+// If we declare them as taking LOGFONT below, the code would be able to
+// silently pass LOGFONTA to them in ANSI build and would crash at run-time
+// under Windows Vista/7 because of a buffer overrun (LOGFONTA being smaller
+// than LOGFONTW expected by these functions). If we we declare them as taking
+// LOGFONTW, the code wouldn't work correctly under XP. So we use a special
+// wxUxThemeFont class to encapsulate this and intentionally change the LOGFONT
+// output parameters of the theme functions to take it instead.
+
+class wxUxThemeFont
+{
+public:
+    // Trivial default ctor.
+    wxUxThemeFont() { }
+
+    // Just some unique type.
+    struct Ptr { };
+
+#if wxUSE_UNICODE
+    // In Unicode build we always use LOGFONT anyhow so this class is
+    // completely trivial.
+    Ptr *GetPtr() { return reinterpret_cast<Ptr *>(&m_lfW); }
+    const LOGFONTW& GetLOGFONT() { return m_lfW; }
+#else // !wxUSE_UNICODE
+    // Return either LOGFONTA or LOGFONTW pointer as required by the current
+    // Windows version.
+    Ptr *GetPtr()
+    {
+        return UseLOGFONTW() ? reinterpret_cast<Ptr *>(&m_lfW)
+                             : reinterpret_cast<Ptr *>(&m_lfA);
+    }
+
+    // This method returns LOGFONT (i.e. LOGFONTA in ANSI build and LOGFONTW in
+    // Unicode one) which can be used with other, normal, Windows or wx
+    // functions. Internally it may need to transform LOGFONTW to LOGFONTA.
+    const LOGFONTA& GetLOGFONT()
+    {
+        if ( UseLOGFONTW() )
+        {
+            // Most of the fields are the same in LOGFONTA and LOGFONTW so just
+            // copy everything by default.
+            memcpy(&m_lfA, &m_lfW, sizeof(m_lfA));
+
+            // But the face name must be converted from Unicode.
+            WideCharToMultiByte(CP_ACP, 0, m_lfW.lfFaceName, -1,
+                                m_lfA.lfFaceName, sizeof(m_lfA.lfFaceName),
+                                NULL, NULL);
+        }
+
+        return m_lfA;
+    }
+
+private:
+    static bool UseLOGFONTW()
+    {
+        return wxGetWinVersion() >= wxWinVersion_Vista;
+    }
+
+    LOGFONTA m_lfA;
+#endif // wxUSE_UNICODE/!wxUSE_UNICODE
+
+private:
+    LOGFONTW m_lfW;
+
+    wxDECLARE_NO_COPY_CLASS(wxUxThemeFont);
+};
+
 typedef HTHEME  (__stdcall *PFNWXUOPENTHEMEDATA)(HWND, const wchar_t *);
 typedef HRESULT (__stdcall *PFNWXUCLOSETHEMEDATA)(HTHEME);
 typedef HRESULT (__stdcall *PFNWXUDRAWTHEMEBACKGROUND)(HTHEME, HDC, int, int, const RECT *, const RECT *);
@@ -39,7 +107,7 @@ typedef HRESULT (__stdcall *PFNWXUGETTHEMEBOOL)(HTHEME, int, int, int, BOOL *);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMEINT)(HTHEME, int, int, int, int *);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMEENUMVALUE)(HTHEME, int, int, int, int *);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMEPOSITION)(HTHEME, int, int, int, POINT *);
-typedef HRESULT (__stdcall *PFNWXUGETTHEMEFONT)(HTHEME, HDC, int, int, int, LOGFONT *);
+typedef HRESULT (__stdcall *PFNWXUGETTHEMEFONT)(HTHEME, HDC, int, int, int, wxUxThemeFont::Ptr *);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMERECT)(HTHEME, int, int, int, RECT *);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMEMARGINS)(HTHEME, HDC, int, int, int, RECT *, MARGINS *);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMEINTLIST)(HTHEME, int, int, int, INTLIST*);
@@ -50,7 +118,7 @@ typedef COLORREF(__stdcall *PFNWXUGETTHEMESYSCOLOR)(HTHEME, int);
 typedef HBRUSH  (__stdcall *PFNWXUGETTHEMESYSCOLORBRUSH)(HTHEME, int);
 typedef BOOL    (__stdcall *PFNWXUGETTHEMESYSBOOL)(HTHEME, int);
 typedef int     (__stdcall *PFNWXUGETTHEMESYSSIZE)(HTHEME, int);
-typedef HRESULT (__stdcall *PFNWXUGETTHEMESYSFONT)(HTHEME, int, LOGFONT *);
+typedef HRESULT (__stdcall *PFNWXUGETTHEMESYSFONT)(HTHEME, int, wxUxThemeFont::Ptr *);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMESYSSTRING)(HTHEME, int, wchar_t *, int);
 typedef HRESULT (__stdcall *PFNWXUGETTHEMESYSINT)(HTHEME, int, int *);
 typedef BOOL    (__stdcall *PFNWXUISTHEMEACTIVE)();