/*
   ui/slider.h
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#ifndef __INCLUDED_UI_SLIDER_H__
#define __INCLUDED_UI_SLIDER_H__

#include <string>
#include "ui/button.h"
#include "ui/widget.h"

namespace ui
{

/**
 * @brief a slider widget
 */
class Slider : public Widget
{
public:
	Slider(Widget *parent, const float minimum = 0.0f, const float maximum = 1.0f);
	~Slider();

	/**
	 * @brief the current slider value
	 */
	inline const float value() const {
		return slider_value;
	}
	
	/**
	 * @brief the minimum value
	 */
	inline const float minimum() const {
		return slider_minimum;
	}
	
	/**
	 * @brief the maximum value
	 */
	inline const float maximum() const {
		return slider_maximum;
	}
		
	/**
	 * @brief print widget description to console
	 */
	virtual void print(const size_t indent) const;
	
	/**
	 * @brief set the current slider value
	 * @see value
	 */
	void set_value(const float value);
	
	/**
	 * @brief set the minimum slider value
	 * @see minimum
	 */
	void set_minimum(const float minimum);
	
	/**
	 * @brief set the maximum slider value
	 * @see maximum
	 */
	void set_maximum(const float maximum);

	/**
	 * @brief set the minimum and maximum slider values
	 * @see minimum
	 * @see maximum
	 */
	void set_range(const float minimum, const float maximum);

	/// show the widget
	virtual void show();

protected:
	
	/// resize event handler
	virtual void resize();
	
	/// draw event handler
	virtual void draw();
	
	/// emit event handler
	virtual bool on_emit(Widget *sender, const Event event, void *data=0);
	
	/// keypress event handler
	virtual bool on_keypress(const int key, const unsigned int modifier);
	
	/// keyrelease event handler
	virtual bool on_keyrelease(const int key, const unsigned int modifier);
	
	virtual void on_mouseover(const math::Vector2f &cursor);
	
	/// mouse movement handler
	virtual void on_mousemove(const math::Vector2f &cursor);
private:
	/// validate slider value
	void validate();
	
	float			slider_minimum;
	float			slider_maximum;
	float			slider_value;
	bool			slider_dragging;
	
	Button			*slider_minbutton;
	Button			*slider_decbutton;
	Button			*slider_incbutton;
	Button			*slider_maxbutton;
};

}

#endif // __INCLUDED_UI_SLIDER_H__