Add support for retrieving the currently selected text. Implement on all backends, document and unit test.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/SOC2011_WEBVIEW@68220 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/webview_webkit.h

@@ -142,6 +142,7 @@ public:
     virtual void DeleteSelection();
     virtual bool HasSelection();
     virtual void SelectAll();
+    virtual wxString GetSelectedText();
 
     /** FIXME: hack to work around signals being received too early */
     bool m_ready;

include/wx/msw/webview_ie.h

@@ -101,6 +101,7 @@ public:
     virtual void SelectAll();
     virtual bool HasSelection();
     virtual void DeleteSelection();
+    virtual wxString GetSelectedText();
 
 
     // ---- IE-specific methods

include/wx/osx/webview_webkit.h

@@ -106,10 +106,9 @@ public:
     virtual void DeleteSelection();
     virtual bool HasSelection() { return false };
     virtual void SelectAll() {};
+    virtual wxString GetSelectedText();
 
     // ---- methods not from the parent (common) interface
-    wxString GetSelectedText();
-
     wxString RunScript(const wxString& javascript);
 
     bool  CanGetPageSource();

include/wx/webview.h

@@ -287,11 +287,9 @@ public:
     virtual void SelectAll() = 0;
     virtual bool HasSelection() = 0;
     virtual void DeleteSelection() = 0;
+    virtual wxString GetSelectedText() = 0;
 
     // TODO:
-    //     wxString GetSelection();                         // maybe?
-    //     void SetSelection(...);                          // maybe?
-
     //     void EnableJavascript(bool enabled);             // maybe?
     //     wxString RunScript(const wxString& javascript);  // maybe?