Nana - a C++ framework project   The Programmer's Guide

nana::gui::appearance Description This is a structure type defined to specify the appearance of a form. Its definition is. struct appearance {     struct decoration_desc     {         bool empty;         bool minimize;         bool maximize;         bool sizable;         decoration_desc();         decoration_desc(bool minimize,                         bool maximize,                         bool sizable);     }decoration;     bool taskbar;     bool floating;     appearance();     appearance(bool no_decoration,                 bool taskbar,                 bool floating);     appearance(bool min,                 bool max,                 bool size,                 bool show_taskbar,                 bool floating); }; If a form would to be defined without min/max button and sizable border, then     nana::gui::form form(x, y, width, height, nana::gui::appearance(false, false, false, true, false)); This piece of code may be confused because of the 5th parameter of constructor from nana::gui::form. So the library provides a helper class for making it easy. struct appear {     struct minimize{};     struct maximize{};     struct sizable{};     struct taskbar{};     struct floating{};     template<typename Param0 = null_type,              typename Param1 = null_type,              typename Param2 = null_type,              typename Param3 = null_type,              typename Param4 = null_type>     struct decorate     {         operator appearance() const;     };     template<typename Param0 = null_type,              typename Param1 = null_type>     struct bald     {         operator appearance() const;     };     template<bool HasDecoration,              typename Param0 = null_type,              typename Param1 = null_type>     struct optional     {         operator appearance() const;     }; }; nana:gui::appear::decorate is used for creating an appearance of a window decoration. the window decoration in Windows is called non-client area, such as title bar. So, we can create a form without min/max button and sizable border like this.     using nana::gui::appear;     nana::gui::form form(x, y, width, height, appear::decorate<appear::taskbar>()); If a window needs a minimize button, it should be     appear::decorate<appear::minimize, appear::taskbar>() The nana::gui::appear::bald is used for creating a window without decoration.  The nana::gui::appear::optional is used for creating a window with decoration depending on the first non-type template parameter. The parameter of class template decorate can be minimize, maximize, sizable, taskbar, floating. The parameter of class template bald can be taskbar, floating. The parameter of class template optional can be true, false, taskbar, floating. Model of  None Public base classes  None Members File nana/gui/basis.hpp Notes None. See also  nana::gui::form Move to The Nana Programmer's Guide Main Page