extracted wxTextWrapper in its own header and made it public

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@60848 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/textwrapper.h

@@ -0,0 +1,68 @@
+///////////////////////////////////////////////////////////////////////////////
+// Name:        wx/textwrapper.h
+// Purpose:     declaration of wxTextWrapper class
+// Author:      Vadim Zeitlin
+// Created:     2009-05-31 (extracted from dlgcmn.cpp via wx/private/stattext.h)
+// RCS-ID:      $Id$
+// Copyright:   (c) 1999, 2009 Vadim Zeitlin <vadim@wxwidgets.org>
+// Licence:     wxWindows licence
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef _WX_TEXTWRAPPER_H_
+#define _WX_TEXTWRAPPER_H_
+
+// ----------------------------------------------------------------------------
+// wxTextWrapper
+// ----------------------------------------------------------------------------
+
+// this class is used to wrap the text on word boundary: wrapping is done by
+// calling OnStartLine() and OnOutputLine() functions
+class wxTextWrapper
+{
+public:
+    wxTextWrapper() { m_eol = false; }
+
+    // win is used for getting the font, text is the text to wrap, width is the
+    // max line width or -1 to disable wrapping
+    void Wrap(wxWindow *win, const wxString& text, int widthMax);
+
+    // we don't need it, but just to avoid compiler warnings
+    virtual ~wxTextWrapper() { }
+
+protected:
+    // line may be empty
+    virtual void OnOutputLine(const wxString& line) = 0;
+
+    // called at the start of every new line (except the very first one)
+    virtual void OnNewLine() { }
+
+private:
+    // call OnOutputLine() and set m_eol to true
+    void DoOutputLine(const wxString& line)
+    {
+        OnOutputLine(line);
+
+        m_eol = true;
+    }
+
+    // this function is a destructive inspector: when it returns true it also
+    // resets the flag to false so calling it again wouldn't return true any
+    // more
+    bool IsStartOfNewLine()
+    {
+        if ( !m_eol )
+            return false;
+
+        m_eol = false;
+
+        return true;
+    }
+
+
+    bool m_eol;
+
+    wxDECLARE_NO_COPY_CLASS(wxTextWrapper);
+};
+
+#endif // _WX_TEXTWRAPPER_H_
+