scroll_bar.h

/*************************************************************************/
/*  scroll_bar.h                                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
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/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/
#ifndef SCROLL_BAR_H
#define SCROLL_BAR_H

#include "scene/gui/range.h"


/**
	@author Juan Linietsky <reduzio@gmail.com>
*/
class ScrollBar : public Range {

	OBJ_TYPE( ScrollBar, Range );

	enum HiliteStatus {
		HILITE_NONE,
		HILITE_DECR,
		HILITE_RANGE,
		HILITE_INCR,
	};

	static bool focus_by_default;

	Orientation orientation;
	Size2 size;
	float custom_step;

	HiliteStatus hilite;

	struct Drag {

		bool active;
		float pos_at_click;
		float value_at_click;
	} drag;


	double get_grabber_size() const;
	double get_grabber_min_size() const;
	double get_area_size() const;
	double get_area_offset() const;
	double get_click_pos(const Point2& p_pos) const;
	double get_grabber_offset() const;

	static void set_can_focus_by_default(bool p_can_focus);

	Node* drag_slave;
	NodePath drag_slave_path;

	Vector2 drag_slave_speed;
	Vector2 drag_slave_accum;
	Vector2 drag_slave_from;
	Vector2 last_drag_slave_accum;
	float last_drag_slave_time;
	float time_since_motion;
	bool drag_slave_touching;
	bool drag_slave_touching_deaccel;
	bool click_handled;

	void _drag_slave_exit();
	void _drag_slave_input(const InputEvent& p_input);

	void _input_event(InputEvent p_event);
protected:
	void _notification(int p_what);

	static void _bind_methods();

public:

	void set_custom_step(float p_custom_step);
	float get_custom_step() const;

	void set_drag_slave(const NodePath& p_path);
	NodePath get_drag_slave() const;

	virtual Size2 get_minimum_size() const;
	ScrollBar(Orientation p_orientation=VERTICAL);
	~ScrollBar();

};

class HScrollBar : public ScrollBar {

	OBJ_TYPE( HScrollBar, ScrollBar );
public:

	HScrollBar() : ScrollBar(HORIZONTAL) { 	set_v_size_flags(0); }
};

class VScrollBar : public ScrollBar {

	OBJ_TYPE( VScrollBar, ScrollBar );
public:

	VScrollBar() : ScrollBar(VERTICAL) { set_h_size_flags(0); }
};


#endif