Implement wxDataViewCustomRenderer::GetAccessibleDescription()

This is a default description of the renderer content (for accessibility purposes).
Thanks to this implementation there is not necessary to override GetAccessibleDescription() in the renderers derived from wxDataViewCustomRenderer.

include/wx/generic/dvrenderers.h

@@ -36,6 +36,10 @@ public:
         return ActivateCell(cell, model, item, col, mouseEvent);
     }
 
+#if wxUSE_ACCESSIBILITY
+    virtual wxString GetAccessibleDescription() const wxOVERRIDE;
+#endif // wxUSE_ACCESSIBILITY
+
 private:
     wxDECLARE_DYNAMIC_CLASS_NO_COPY(wxDataViewCustomRenderer);
 };

interface/wx/dataview.h

@@ -2234,14 +2234,15 @@ public:
     order to write a new renderer.
 
     You need to override at least wxDataViewRenderer::SetValue, wxDataViewRenderer::GetValue,
-    wxDataViewCustomRenderer::GetSize and wxDataViewCustomRenderer::Render and, if
-    @c wxUSE_ACCESSIBILITY setup symbol is set to 1, also
-    wxDataViewRenderer::GetAccessibleDescription.
+    wxDataViewCustomRenderer::GetSize and wxDataViewCustomRenderer::Render.
 
     If you want your renderer to support in-place editing then you also need to override
     wxDataViewCustomRenderer::HasEditorCtrl, wxDataViewCustomRenderer::CreateEditorCtrl
     and wxDataViewCustomRenderer::GetValueFromEditorCtrl.
 
+    If @c wxUSE_ACCESSIBILITY setup symbol is set to 1, you might need to override also
+    wxDataViewRenderer::GetAccessibleDescription.
+
     Note that a special event handler will be pushed onto that editor control
     which handles @e \<ENTER\> and focus out events in order to end the editing.
 

src/generic/datavgen.cpp

@@ -1012,6 +1012,29 @@ wxDataViewCustomRenderer::wxDataViewCustomRenderer( const wxString &varianttype,
 {
 }
 
+#if wxUSE_ACCESSIBILITY
+wxString wxDataViewCustomRenderer::GetAccessibleDescription() const
+{
+    wxVariant val;
+    GetValue(val);
+
+    wxString strVal;
+    if ( val.IsType(wxS("bool")) )
+    {
+        /* TRANSLATORS: Name of Boolean true value */
+        strVal = val.GetBool() ? _("true")
+        /* TRANSLATORS: Name of Boolean false value */
+                               : _("false");
+    }
+    else
+    {
+        strVal = val.MakeString();
+    }
+
+    return strVal;
+}
+#endif // wxUSE_ACCESSIBILITY
+
 // ---------------------------------------------------------
 // wxDataViewTextRenderer
 // ---------------------------------------------------------