ccmake: Teach dialog to support cache STRINGS property

This commit adds the ability to ccmake of cycling through cache options.
This uses the STRINGS property of the cache entry. The enter key will cycle
forward, and the right and left arrows will go up and down in the list.

Source/CursesDialog/cmCursesOptionsWidget.h

@@ -0,0 +1,39 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef __cmCursesOptionsWidget_h
+#define __cmCursesOptionsWidget_h
+
+#include "cmCursesWidget.h"
+class cmCursesMainForm;
+
+class cmCursesOptionsWidget : public cmCursesWidget
+{
+public:
+  cmCursesOptionsWidget(int width, int height, int left, int top);
+
+  // Description:
+  // Handle user input. Called by the container of this widget
+  // when this widget has focus. Returns true if the input was
+  // handled.
+  virtual bool HandleInput(int& key, cmCursesMainForm* fm, WINDOW* w);
+  void SetOption(const char*);
+  void AddOption(std::string const &);
+  void NextOption();
+  void PreviousOption();
+protected:
+  cmCursesOptionsWidget(const cmCursesOptionsWidget& from);
+  void operator=(const cmCursesOptionsWidget&);
+  std::vector<std::string> Options;
+  std::vector<std::string>::size_type CurrentOption;
+};
+
+#endif // __cmCursesOptionsWidget_h