50 lines
1.9 KiB
C++
50 lines
1.9 KiB
C++
/*
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* A Drawing Implementation
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* Nana C++ Library(http://www.nanapro.org)
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* Copyright(C) 2003-2014 Jinhao(cnjinhao@hotmail.com)
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*
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* Distributed under the Boost Software License, Version 1.0.
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* (See accompanying file LICENSE_1_0.txt or copy at
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* http://www.boost.org/LICENSE_1_0.txt)
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*
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* @file: nana/gui/drawing.hpp
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*/
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#ifndef NANA_GUI_DRAWING_HPP
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#define NANA_GUI_DRAWING_HPP
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#include "widgets/widget.hpp"
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#include "../traits.hpp"
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namespace nana
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{
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/// \brief Draw pictures on a widget by specifying a drawing method that will be employed everytime the widget refreshes.
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/// By the end of drawing, the picture may not be displayed immediately.
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/// If a picture need to be displayed immediately call nana::gui::API::refresh_window() .
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class drawing
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:private nana::noncopyable
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{
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public:
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typedef struct{}* diehard_t; ///< A handle to a drawing method
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typedef std::function<void(paint::graphics&)> draw_fn_t; ///< A function to draw
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drawing(window w); ///< Create a drawing object for a widget w
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virtual ~drawing(); ///< Just for polymorphism
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bool empty() const; ///< Returns true if the drawing object is invalid.
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void update() const;
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void draw(const draw_fn_t&); ///< Draws things that are defined by draw_fn_t.
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void draw(draw_fn_t&&); ///< Draws things that are defined by draw_fn_t.
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/// Draws things that are defined by draw_fn_t but will not be deleted when clear() is called.
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diehard_t draw_diehard(const draw_fn_t&);
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/// Draws things that are defined by draw_fn_t but will not be deleted when clear() is called.
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diehard_t draw_diehard(draw_fn_t&&);
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void erase(diehard_t); ///< Erases a diehard drawing method.
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void clear(); ///< Erases all.
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private:
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window handle_;
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};//end class drawing
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}//end namespace nana
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#endif
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