support retina display

[wxWidgets.git] / include / wx / convauto.h

diff --git a/include/wx/convauto.h b/include/wx/convauto.h
index 6dc550ab49017065a23e583c589adbbb8739ad3b..25019a55e55fa52866c1405212f4bfe37e8dc894 100644 (file)
--- a/include/wx/convauto.h
+++ b/include/wx/convauto.h
@@ -12,76 +12,133 @@
 #define _WX_CONVAUTO_H_
 
 #include "wx/strconv.h"
-
-#if wxUSE_WCHAR_T
+#include "wx/fontenc.h"
 
 // ----------------------------------------------------------------------------
 // wxConvAuto: uses BOM to automatically detect input encoding
 // ----------------------------------------------------------------------------
 
+// All currently recognized BOM values.
+enum wxBOM
+{
+    wxBOM_Unknown = -1,
+    wxBOM_None,
+    wxBOM_UTF32BE,
+    wxBOM_UTF32LE,
+    wxBOM_UTF16BE,
+    wxBOM_UTF16LE,
+    wxBOM_UTF8
+};
+
 class WXDLLIMPEXP_BASE wxConvAuto : public wxMBConv
 {
 public:
     // default ctor, the real conversion will be created on demand
-    wxConvAuto() { m_conv = NULL; /* the rest will be initialized later */ }
+    wxConvAuto(wxFontEncoding enc = wxFONTENCODING_DEFAULT)
+    {
+        Init();
+
+        m_encDefault = enc;
+    }
 
     // copy ctor doesn't initialize anything neither as conversion can only be
     // deduced on first use
-    wxConvAuto(const wxConvAuto& WXUNUSED(other)) { m_conv = NULL; }
+    wxConvAuto(const wxConvAuto& other) : wxMBConv()
+    {
+        Init();
+
+        m_encDefault = other.m_encDefault;
+    }
+
+    virtual ~wxConvAuto()
+    {
+        if ( m_ownsConv )
+            delete m_conv;
+    }
+
+    // get/set the fall-back encoding used when the input text doesn't have BOM
+    // and isn't UTF-8
+    //
+    // special values are wxFONTENCODING_MAX meaning not to use any fall back
+    // at all (but just fail to convert in this case) and wxFONTENCODING_SYSTEM
+    // meaning to use the encoding of the system locale
+    static wxFontEncoding GetFallbackEncoding() { return ms_defaultMBEncoding; }
+    static void SetFallbackEncoding(wxFontEncoding enc);
+    static void DisableFallbackEncoding()
+    {
+        SetFallbackEncoding(wxFONTENCODING_MAX);
+    }
 
-    virtual ~wxConvAuto() { if ( m_conv && m_ownsConv ) delete m_conv; }
 
     // override the base class virtual function(s) to use our m_conv
     virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
-                           const char *src, size_t srcLen = -1) const;
+                           const char *src, size_t srcLen = wxNO_LEN) const;
 
     virtual size_t FromWChar(char *dst, size_t dstLen,
-                             const wchar_t *src, size_t srcLen = -1) const;
+                             const wchar_t *src, size_t srcLen = wxNO_LEN) const;
 
     virtual size_t GetMBNulLen() const { return m_conv->GetMBNulLen(); }
 
     virtual wxMBConv *Clone() const { return new wxConvAuto(*this); }
 
-private:
-    // all currently recognized BOM values
-    enum BOMType
+    // return the BOM type of this buffer
+    static wxBOM DetectBOM(const char *src, size_t srcLen);
+
+    // return the characters composing the given BOM.
+    static const char* GetBOMChars(wxBOM bomType, size_t* count);
+
+    wxBOM GetBOM() const
     {
-        BOM_None,
-        BOM_UTF32BE,
-        BOM_UTF32LE,
-        BOM_UTF16BE,
-        BOM_UTF16LE,
-        BOM_UTF8
-    };
+        return m_bomType;
+    }
 
-    // return the BOM type of this buffer
-    static BOMType DetectBOM(const char *src, size_t srcLen);
+private:
+    // common part of all ctors
+    void Init()
+    {
+        // We don't initialize m_encDefault here as different ctors do it
+        // differently.
+        m_conv = NULL;
+        m_bomType = wxBOM_Unknown;
+        m_ownsConv = false;
+        m_consumedBOM = false;
+    }
 
-    // initialize m_conv with the conversion to use by default (UTF-8)
-    void InitWithDefault()
+    // initialize m_conv with the UTF-8 conversion
+    void InitWithUTF8()
     {
         m_conv = &wxConvUTF8;
         m_ownsConv = false;
     }
 
     // create the correct conversion object for the given BOM type
-    void InitFromBOM(BOMType bomType);
+    void InitFromBOM(wxBOM bomType);
 
     // create the correct conversion object for the BOM present in the
-    // beginning of the buffer; adjust the buffer to skip the BOM if found
-    void InitFromInput(const char **src, size_t *len);
+    // beginning of the buffer
+    //
+    // return false if the buffer is too short to allow us to determine if we
+    // have BOM or not
+    bool InitFromInput(const char *src, size_t len);
 
     // adjust src and len to skip over the BOM (identified by m_bomType) at the
     // start of the buffer
     void SkipBOM(const char **src, size_t *len) const;
 
 
+    // fall-back multibyte encoding to use, may be wxFONTENCODING_SYSTEM or
+    // wxFONTENCODING_MAX but not wxFONTENCODING_DEFAULT
+    static wxFontEncoding ms_defaultMBEncoding;
+
     // conversion object which we really use, NULL until the first call to
     // either ToWChar() or FromWChar()
     wxMBConv *m_conv;
 
+    // the multibyte encoding to use by default if input isn't Unicode
+    wxFontEncoding m_encDefault;
+
     // our BOM type
-    BOMType m_bomType;
+    wxBOM m_bomType;
 
     // true if we allocated m_conv ourselves, false if we just use an existing
     // global conversion
@@ -92,10 +149,8 @@ private:
     bool m_consumedBOM;
 
 
-    DECLARE_NO_ASSIGN_CLASS(wxConvAuto);
+    wxDECLARE_NO_ASSIGN_CLASS(wxConvAuto);
 };
 
-#endif // wxUSE_WCHAR_T
-
 #endif // _WX_CONVAUTO_H_