Add wxHtmlTag::GetParamAsString() convenience method.

This is more convenient to use than HasParam() + GetParam() and also slightly
more efficient as we search for the tag name only once.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74879 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/htmltag.cpp

@@ -511,6 +511,19 @@ wxString wxHtmlTag::GetParam(const wxString& par, bool with_quotes) const
         return m_ParamValues[index];
 }
 
+bool wxHtmlTag::GetParamAsString(const wxString& par, wxString *str) const
+{
+    wxCHECK_MSG( str, false, wxT("NULL output string argument") );
+
+    int index = m_ParamNames.Index(par, false);
+    if (index == wxNOT_FOUND)
+        return false;
+
+    *str = m_ParamValues[index];
+
+    return true;
+}
+
 int wxHtmlTag::ScanParam(const wxString& par,
                          const char *format,
                          void *param) const