Fix build with wxUSE_FFILE=0.

Add the missing "#if wxUSE_FFILE" checks and add fallbacks to wxFile if it's
available.

Closes #15353.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74596 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/richtext/richtextbuffer.h

@@ -4842,23 +4842,41 @@ public:
     */
     virtual void ResetAndClearCommands();
 
+#if wxUSE_FFILE && wxUSE_STREAMS
     //@{
     /**
-        Loads content from a stream or file.
+        Loads content from a file.
         Not all handlers will implement file loading.
     */
     virtual bool LoadFile(const wxString& filename, wxRichTextFileType type = wxRICHTEXT_TYPE_ANY);
+    //@}
+
+    //@{
+    /**
+        Saves content to a file.
+        Not all handlers will implement file saving.
+    */
+    virtual bool SaveFile(const wxString& filename, wxRichTextFileType type = wxRICHTEXT_TYPE_ANY);
+    //@}
+#endif // wxUSE_FFILE
+
+#if wxUSE_STREAMS
+    //@{
+    /**
+        Loads content from a stream.
+        Not all handlers will implement loading from a stream.
+    */
     virtual bool LoadFile(wxInputStream& stream, wxRichTextFileType type = wxRICHTEXT_TYPE_ANY);
     //@}
 
     //@{
     /**
-        Saves content to a stream or file.
-        Not all handlers will implement file saving.
+        Saves content to a stream.
+        Not all handlers will implement saving to a stream.
     */
-    virtual bool SaveFile(const wxString& filename, wxRichTextFileType type = wxRICHTEXT_TYPE_ANY);
     virtual bool SaveFile(wxOutputStream& stream, wxRichTextFileType type = wxRICHTEXT_TYPE_ANY);
     //@}
+#endif // wxUSE_STREAMS
 
     /**
         Sets the handler flags, controlling loading and saving.

include/wx/richtext/richtextctrl.h

@@ -573,6 +573,7 @@ public:
                   int type = wxRICHTEXT_TYPE_ANY);
 #endif
 
+#if wxUSE_FFILE && wxUSE_STREAMS
     /**
         Helper function for LoadFile(). Loads content into the control's buffer using the given type.
 
@@ -582,6 +583,7 @@ public:
         This function looks for a suitable wxRichTextFileHandler object.
     */
     virtual bool DoLoadFile(const wxString& file, int fileType);
+#endif // wxUSE_FFILE && wxUSE_STREAMS
 
 #ifdef DOXYGEN
     /**
@@ -596,6 +598,7 @@ public:
                   int type = wxRICHTEXT_TYPE_ANY);
 #endif
 
+#if wxUSE_FFILE && wxUSE_STREAMS
     /**
         Helper function for SaveFile(). Saves the buffer content using the given type.
 
@@ -606,6 +609,7 @@ public:
     */
     virtual bool DoSaveFile(const wxString& file = wxEmptyString,
                             int fileType = wxRICHTEXT_TYPE_ANY);
+#endif // wxUSE_FFILE && wxUSE_STREAMS
 
     /**
         Sets flags that change the behaviour of loading or saving.

include/wx/richtext/richtextprint.h

@@ -165,11 +165,15 @@ public:
     virtual ~wxRichTextPrinting();
 
     /// Preview the file or buffer
+#if wxUSE_FFILE && wxUSE_STREAMS
     bool PreviewFile(const wxString& richTextFile);
+#endif
     bool PreviewBuffer(const wxRichTextBuffer& buffer);
 
     /// Print the file or buffer
+#if wxUSE_FFILE && wxUSE_STREAMS
     bool PrintFile(const wxString& richTextFile, bool showPrintDialog = true);
+#endif
     bool PrintBuffer(const wxRichTextBuffer& buffer, bool showPrintDialog = true);
 
     /// Shows page setup dialog