add maxline restriction in single line mode textCtrl. let textctrl will fire wxEVT_TEXT_MAXLEN and not recive the chars when the text length beyond the maxlength

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77819 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/textctrl.h

@@ -110,6 +110,7 @@ public:
     virtual bool IsModified() const wxOVERRIDE;
     virtual bool IsEditable() const wxOVERRIDE;
 
+    virtual void SetMaxLength(unsigned long len) wxOVERRIDE;
     // If the return values from and to are the same, there is no selection.
     virtual void GetSelection(wxTextPos* from, wxTextPos* to) const wxOVERRIDE;
 
@@ -489,6 +490,11 @@ private:
     // last position (only used by GetLastPosition())
     wxTextPos m_posLast;
 
+    // max text line length
+    long m_maxLength;
+    // current text line length
+    long m_textLength;
+
     // selection
     wxTextPos m_selAnchor,
               m_selStart,