/*      _______   __   __   __   ______   __   __   _______   __   __
 *     / _____/\ / /\ / /\ / /\ / ____/\ / /\ / /\ / ___  /\ /  |\/ /\
 *    / /\____\// / // / // / // /\___\// /_// / // /\_/ / // , |/ / /
 *   / / /__   / / // / // / // / /    / ___  / // ___  / // /| ' / /
 *  / /_// /\ / /_// / // / // /_/_   / / // / // /\_/ / // / |  / /
 * /______/ //______/ //_/ //_____/\ /_/ //_/ //_/ //_/ //_/ /|_/ /
 * \______\/ \______\/ \_\/ \_____\/ \_\/ \_\/ \_\/ \_\/ \_\/ \_\/
 *
 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
 * Visit: http://guichan.darkbits.org             )Qk<P ` _: :+' .'  "{[
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#ifndef GCN_SLIDER_HPP
#define GCN_SLIDER_HPP

#include "guisan/keylistener.hpp"
#include "guisan/mouselistener.hpp"
#include "guisan/platform.hpp"
#include "guisan/widget.hpp"

namespace gcn
{
	/**
	 * A slider able to slide between different values. You can set the scale
	 * of the slider yourself so that it ranges between, for example, -1.0 and
	 * 2.0.
	 */
	class GCN_CORE_DECLSPEC Slider :
		public Widget,
		public MouseListener,
		public KeyListener
	{
	public:

		/**
		 * Constructor. Scale start is 0.
		 *
		 * @param scaleEnd the end of the slider scale.
		 */
		Slider(double scaleEnd = 1.0);

		/**
		 * Constructor.
		 *
		 * @param scaleStart the start of the scale.
		 * @param scaleEnd the end of the scale.
		 */
		Slider(double scaleStart, double scaleEnd);

		/**
		 * Destructor.
		 */
		virtual ~Slider() { }

		/**
		 * Sets the scale.
		 *
		 * @param scaleStart the start of the scale.
		 * @param scaleEnd the end of the scale.
		 */
		void setScale(double scaleStart, double scaleEnd);

		/**
		 * Gets the scale start.
		 *
		 * @return the scale start.
		 */
		double getScaleStart() const;

		/**
		 * Sets the scale start.
		 *
		 * @param scaleStart the start of the scale.
		 */
		void setScaleStart(double scaleStart);

		/**
		 * Gets the scale end.
		 *
		 * @return the scale end.
		 */
		double getScaleEnd() const;

		/**
		 * Sets the scale end.
		 *
		 * @param scaleEnd the end of the scale.
		 */
		void setScaleEnd(double scaleEnd);

		/**
		 * Gets the current value.
		 *
		 * @return the current value.
		 */
		double getValue() const;

		/**
		 * Sets the current value.
		 *
		 * @param value a scale value.
		 */
		void setValue(double value);

		/**
		 * Draws the marker.
		 *
		 * @param graphics a graphics object to draw with.
		 */
		virtual void drawMarker(gcn::Graphics* graphics);

		/**
		 * Sets the length of the marker.
		 *
		 * @param length new length for the marker.
		 */
		void setMarkerLength(int length);

		/**
		 * Gets the length of the marker.
		 *
		 * @return the length of the marker.
		 */
		int getMarkerLength() const;

		/**
		 * Sets the orientation of the slider. A slider can be drawn verticaly
		 * or horizontaly. For orientation, see the enum in this class.
		 *
		 * @param orientation the orientation.
		 */
		void setOrientation(unsigned int orientation);

		/**
		 * Gets the orientation of the slider. Se the enum in this class.
		 *
		 * @return the orientation of the slider.
		 */
		unsigned int getOrientation() const;

		/**
		 * Sets the step length. Step length is used when the keys left and
		 * right are pressed.
		 *
		 * @param length the step length.
		 */
		void setStepLength(double length);

		/**
		 * Gets the step length.
		 *
		 * @return the step length.
		 */
		double getStepLength() const;


		// Inherited from Widget

		virtual void draw(gcn::Graphics* graphics);

		virtual void drawBorder(gcn::Graphics* graphics);


		// Inherited from MouseListener.

		virtual void mousePressed(MouseEvent& mouseEvent);

		virtual void mouseDragged(MouseEvent& mouseEvent);

		virtual void mouseWheelMovedUp(MouseEvent& mouseEvent);

		virtual void mouseWheelMovedDown(MouseEvent& mouseEvent);


		// Inherited from KeyListener

		virtual void keyPressed(KeyEvent& keyEvent);

		/**
		 * Draw orientations for the slider. It can be drawn vertically or
		 * horizontally.
		 */
		enum
		{
			HORIZONTAL = 0,
			VERTICAL
		};

	protected:
		/**
		 * Converts a marker position to a value.
		 *
		 * @param v the position to convert.
		 * @return the value corresponding to the position.
		 */
		virtual double markerPositionToValue(int v) const;

		/**
		 * Converts a value to a marker position.
		 *
		 * @param value the value to convert.
		 * @return the position corresponding to the value.
		 */
		virtual int valueToMarkerPosition(double value) const;

		/**
		 * Gets the marker position for the current value.
		 *
		 * @return the marker position for the current value.
		 */
		virtual int getMarkerPosition() const;

		bool mMouseDrag;
		double mValue;
		double mStepLength;
		int mMarkerLength;
		double mScaleStart;
		double mScaleEnd;
		unsigned int mOrientation;
	};
}

#endif // end GCN_SLIDER_HPP
