X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/9f2be1259350586411e21c84024967408eef6280..ce07cd8a753b3f7ef65ba0138bad86bb34cb4fff:/include/wx/renderer.h

diff --git a/include/wx/renderer.h b/include/wx/renderer.h
index ba5cb2611a..453baf801a 100644
--- a/include/wx/renderer.h
+++ b/include/wx/renderer.h
@@ -5,12 +5,12 @@
 // Modified by:
 // Created:     20.07.2003
 // RCS-ID:      $Id$
-// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwindows.org>
+// Copyright:   (c) 2003 Vadim Zeitlin <vadim@wxwidgets.org>
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
 
 /*
-   Renderers are used in wxWindows for two similar but different things:
+   Renderers are used in wxWidgets for two similar but different things:
     (a) wxUniversal uses them to draw everything, i.e. all the control
     (b) all the native ports use them to draw generic controls only
 
@@ -85,6 +85,37 @@ struct WXDLLEXPORT wxSplitterRenderParams
     const bool isHotSensitive;
 };
 
+// wxRendererNative interface version
+struct WXDLLEXPORT wxRendererVersion
+{
+    wxRendererVersion(int version_, int age_) : version(version_), age(age_) { }
+
+    // default copy ctor, assignment operator and dtor are ok
+
+    // the current version and age of wxRendererNative interface: different
+    // versions are incompatible (in both ways) while the ages inside the same
+    // version are upwards compatible, i.e. the version of the renderer must
+    // match the version of the main program exactly while the age may be
+    // highergreater or equal to it
+    //
+    // NB: don't forget to increment age after adding any new virtual function!
+    enum
+    {
+        Current_Version = 1,
+        Current_Age = 5
+    };
+
+
+    // check if the given version is compatible with the current one
+    static bool IsCompatible(const wxRendererVersion& ver)
+    {
+        return ver.version == Current_Version && ver.age >= Current_Age;
+    }
+
+    const int version;
+    const int age;
+};
+
 // ----------------------------------------------------------------------------
 // wxRendererNative: abstracts drawing methods needed by the native controls
 // ----------------------------------------------------------------------------
@@ -92,8 +123,6 @@ struct WXDLLEXPORT wxSplitterRenderParams
 class WXDLLEXPORT wxRendererNative
 {
 public:
-    virtual ~wxRendererNative() { } // stop GCC warning
-
     // drawing functions
     // -----------------
 
@@ -160,6 +189,18 @@ public:
     //
     // return the previous renderer used with Set() or NULL if none
     static wxRendererNative *Set(wxRendererNative *renderer);
+
+
+    // miscellaneous stuff
+    // -------------------
+
+    // this function is used for version checking: Load() refuses to load any
+    // DLLs implementing an older or incompatible version; it should be
+    // implemented simply by returning wxRendererVersion::Current_XXX values
+    virtual wxRendererVersion GetVersion() const = 0;
+
+    // virtual dtor for any base class
+    virtual ~wxRendererNative();
 };
 
 // ----------------------------------------------------------------------------
@@ -207,6 +248,9 @@ public:
     virtual wxSplitterRenderParams GetSplitterParams(const wxWindow *win)
         { return m_rendererNative.GetSplitterParams(win); }
 
+    virtual wxRendererVersion GetVersion() const
+        { return m_rendererNative.GetVersion(); }
+
 protected:
     wxRendererNative& m_rendererNative;