+// 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);
+};
+
projects / wxWidgets.git / blobdiff