Committing in .

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

diff --git a/include/wx/renderer.h b/include/wx/renderer.h
index ba5cb2611a17b2c0dc68cbe79a0048c4d6980d9b..453baf801ad7571456b1254ebdd07bfe0cc6191e 100644 (file)
--- a/include/wx/renderer.h
+++ b/include/wx/renderer.h
@@ -5,12 +5,12 @@
 // Modified by:
 // Created:     20.07.2003
 // RCS-ID:      $Id$
 // 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
 ///////////////////////////////////////////////////////////////////////////////
 
 /*
 // 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
 
     (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;
 };
 
     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
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // wxRendererNative: abstracts drawing methods needed by the native controls
 // ----------------------------------------------------------------------------


@@ -92,8 +123,6 @@ struct WXDLLEXPORT wxSplitterRenderParams
 class WXDLLEXPORT wxRendererNative
 {
 public:
 class WXDLLEXPORT wxRendererNative
 {
 public:

-    virtual ~wxRendererNative() { } // stop GCC warning
-

     // drawing functions
     // -----------------
 
     // drawing functions
     // -----------------
 


@@ -160,6 +189,18 @@ public:
     //
     // return the previous renderer used with Set() or NULL if none
     static wxRendererNative *Set(wxRendererNative *renderer);
     //
     // 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 wxSplitterRenderParams GetSplitterParams(const wxWindow *win)
         { return m_rendererNative.GetSplitterParams(win); }
 

+    virtual wxRendererVersion GetVersion() const
+        { return m_rendererNative.GetVersion(); }
+

 protected:
     wxRendererNative& m_rendererNative;
 
 protected:
     wxRendererNative& m_rendererNative;