// Copyright (C) 2012-2013 ChaosForge / Kornel Kisielewicz
// http://chaosforge.org/
//
// This file is part of NV Libraries.
// For conditions of distribution and use, see copyright notice in nv.hh

/**
 * @file gui_element.hh
 * @author Kornel Kisielewicz
 * @brief GUI Element
 */

#ifndef NV_GUI_ELEMENT_HH
#define NV_GUI_ELEMENT_HH

#include <nv/object.hh>
#include <nv/position.hh>
#include <nv/io_event.hh>
#include <nv/gui/gui_common.hh>

namespace nv
{
	namespace gui
	{
		class element : public object
		{
		protected:

			/**
			 * Creates a new GUI element with the give root node and positioning data.
			 *
			 * @param r The rectangle representing the position and size of this element.
			 */
			explicit element( const rectangle& r )
					: object( "" ), m_class(""), m_relative( r ), m_absolute( r ), m_enabled( true ), m_visible( true ), m_dirty( true ), m_render_data( nullptr ) {}

		public:

			/**
			 * Checks if this element contains the given point.
			 *
			 * @param p The point to check.
			 * @returns True if the point is within the region of the element, false otherwise.
			 */
			virtual bool contains( const position& p ) const
			{
				return m_absolute.contains( p );
			}

			/**
			 * Gets the position and size of the element relative to its parent.
			 *
			 * @returns The element's position and size relative to its parent.
			 */
			virtual const rectangle& get_relative() const { return m_relative; }

			/**
			 * Gets the position and size of the element relative to the root (window).
			 *
			 * @returns The element's position and size relative to the root (window).
			 */
			virtual const rectangle& get_absolute() const { return m_absolute; }

			/**
			 * Gets whether this element is currently accepting events.
			 *
			 * @returns True if the element is receiving events, false otherwise.
			 */
			virtual bool is_enabled() const { return m_enabled; }

			/**
			 * Gets whether this element is currently visible.
			 *
			 * @returns True if the element is visible, false otherwise.
			 */
			virtual bool is_visible() const { return m_visible; }

			/**
			 * Gets whether this element needs to be redrawn.
			 *
			 * @returns True if the element needs to be redrawn, false if not.
			 */
			virtual bool is_dirty()   const { return m_dirty; }

			/**
			 * Sets whether this element is currently accepting events.
			 *
			 * @param value True to allow the element and its children to receive events, false to disable.
			 */
			virtual void set_enabled( bool value ) { m_enabled = value; }

			/**
			 * Sets whether this element is visible on the screen.
			 *
			 * @param value True to display the element and its children, false to hide it and its children.
			 */
			virtual void set_visible( bool value ) { m_visible = value; }

			/**
			 * Sets whether this element needs to be redrawn.
			 *
			 * @param value True to request that the element and its children be redrawn, false if not.
			 */
			virtual void set_dirty( bool value )   { m_dirty   = value; }

			/**
			 * Gets the text associated with this element.
			 *
			 * @returns A string containing the associated text.
			 */
			virtual const string& get_text() const { return m_text; }

			/**
			 * Sets the text associated with this element.
			 *
			 * @param text The new text to associate with this element.
			 */
			virtual void set_text( const string& text ) { m_text = text; m_dirty = true; }

			/**
			 * Gets the class name associated with this element.
			 *
			 * @returns A string containing the class name of this element.
			 */
			virtual const string& get_class() const { return m_class; }

			/**
			 * sets the class name associated with this element.
			 *
			 * @param class_ The new class name.
			 */
			virtual void set_class( const string& class_ ) { m_class = class_; m_dirty = true; }

		protected:
			/**
			 * Destroys the element.
			 */
			virtual ~element() { delete m_render_data; }
		protected:
			friend class environment;
			friend class renderer;

			string    m_class; ///< Class name.
			string    m_text; ///< Displayed label or text.
			rectangle m_relative; ///< Position relative to parent.
			rectangle m_absolute; ///< Position relative to window/screen.
			bool m_enabled; ///< Whether the element accepts events.
			bool m_visible; ///< Whether the element is drawn.
			bool m_dirty; ///< Whether the element needs updating.
			render_data* m_render_data; ///<   -?-
		};

	} // namespace gui

} // namespace nv

#endif // NV_GUI_ELEMENT_HH