text: /*************************************************************************/
  /*  slider.cpp                                                           */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                    http://www.godotengine.org                         */
  /*************************************************************************/
  /* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
  /*                                                                       */
  /* 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    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* 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.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  #include "slider.h"
  #include "os/keyboard.h"
  
  Size2 Slider::get_minimum_size() const {
  
  	Ref<StyleBox> style = get_stylebox("slider");
  	Size2i ms = style->get_minimum_size() + style->get_center_size();
  	return ms;
  }
  
  void Slider::_gui_input(InputEvent p_event) {
  
  	if (p_event.type == InputEvent::MOUSE_BUTTON) {
  
  		InputEventMouseButton &mb = p_event.mouse_button;
  		if (mb.button_index == BUTTON_LEFT) {
  
  			if (mb.pressed) {
  				Ref<Texture> grabber = get_icon(mouse_inside || has_focus() ? "grabber_hilite" : "grabber");
  				grab.pos = orientation == VERTICAL ? mb.y : mb.x;
  				double grab_width = (double)grabber->get_size().width;
  				double grab_height = (double)grabber->get_size().height;
  				double max = orientation == VERTICAL ? get_size().height - grab_height : get_size().width - grab_width;
  				if (orientation == VERTICAL)
  					set_as_ratio(1 - (((double)grab.pos - (grab_height / 2.0)) / max));
  				else
  					set_as_ratio(((double)grab.pos - (grab_width / 2.0)) / max);
  				grab.active = true;
  				grab.uvalue = get_as_ratio();
  			} else {
  				grab.active = false;
  			}
  		} else if (mb.pressed && mb.button_index == BUTTON_WHEEL_UP) {
  
  			set_value(get_value() + get_step());
  		} else if (mb.pressed && mb.button_index == BUTTON_WHEEL_DOWN) {
  			set_value(get_value() - get_step());
  		}
  
  	} else if (p_event.type == InputEvent::MOUSE_MOTION) {
  
  		if (grab.active) {
  
  			Size2i size = get_size();
  			Ref<Texture> grabber = get_icon("grabber");
  			float motion = (orientation == VERTICAL ? p_event.mouse_motion.y : p_event.mouse_motion.x) - grab.pos;
  			if (orientation == VERTICAL)
  				motion = -motion;
  			float areasize = orientation == VERTICAL ? size.height - grabber->get_size().height : size.width - grabber->get_size().width;
  			if (areasize <= 0)
  				return;
  			float umotion = motion / float(areasize);
  			set_as_ratio(grab.uvalue + umotion);
  		}
  	} else {
  
  		if (p_event.is_action("ui_left") && p_event.is_pressed()) {
  
  			if (orientation != HORIZONTAL)
  				return;
  			set_value(get_value() - (custom_step >= 0 ? custom_step : get_step()));
  			accept_event();
  		} else if (p_event.is_action("ui_right") && p_event.is_pressed()) {
  
  			if (orientation != HORIZONTAL)
  				return;
  			set_value(get_value() + (custom_step >= 0 ? custom_step : get_step()));
  			accept_event();
  		} else if (p_event.is_action("ui_up") && p_event.is_pressed()) {
  
  			if (orientation != VERTICAL)
  				return;
  
  			set_value(get_value() + (custom_step >= 0 ? custom_step : get_step()));
  			accept_event();
  		} else if (p_event.is_action("ui_down") && p_event.is_pressed()) {
  
  			if (orientation != VERTICAL)
  				return;
  			set_value(get_value() - (custom_step >= 0 ? custom_step : get_step()));
  			accept_event();
  
  		} else if (p_event.type == InputEvent::KEY) {
  
  			const InputEventKey &k = p_event.key;
  
  			if (!k.pressed)
  				return;
  
  			switch (k.scancode) {
  
  				case KEY_HOME: {
  
  					set_value(get_min());
  					accept_event();
  				} break;
  				case KEY_END: {
  
  					set_value(get_max());
  					accept_event();
  
  				} break;
  			};
  		}
  	}
  }
  
  void Slider::_notification(int p_what) {
  
  	switch (p_what) {
  
  		case NOTIFICATION_MOUSE_ENTER: {
  
  			mouse_inside = true;
  			update();
  		} break;
  		case NOTIFICATION_MOUSE_EXIT: {
  
  			mouse_inside = false;
  			update();
  		} break;
  		case NOTIFICATION_DRAW: {
  			RID ci = get_canvas_item();
  			Size2i size = get_size();
  			Ref<StyleBox> style = get_stylebox("slider");
  			Ref<StyleBox> focus = get_stylebox("focus");
  			Ref<Texture> grabber = get_icon(mouse_inside || has_focus() ? "grabber_hilite" : "grabber");
  			Ref<Texture> tick = get_icon("tick");
  
  			if (orientation == VERTICAL) {
  
  				style->draw(ci, Rect2i(Point2i(), Size2i(style->get_minimum_size().width + style->get_center_size().width, size.height)));
  				/*
  				if (mouse_inside||has_focus())
  					focus->draw(ci,Rect2i(Point2i(),Size2i(style->get_minimum_size().width+style->get_center_size().width,size.height)));
  				*/
  				float areasize = size.height - grabber->get_size().height;
  				if (ticks > 1) {
  					int tickarea = size.height - tick->get_height();
  					for (int i = 0; i < ticks; i++) {
  						if (!ticks_on_borders && (i == 0 || i + 1 == ticks)) continue;
  						int ofs = i * tickarea / (ticks - 1);
  						tick->draw(ci, Point2(0, ofs));
  					}
  				}
  				grabber->draw(ci, Point2i(size.width / 2 - grabber->get_size().width / 2, size.height - get_as_ratio() * areasize - grabber->get_size().height));
  			} else {
  				style->draw(ci, Rect2i(Point2i(), Size2i(size.width, style->get_minimum_size().height + style->get_center_size().height)));
  				/*
  				if (mouse_inside||has_focus())
  					focus->draw(ci,Rect2i(Point2i(),Size2i(size.width,style->get_minimum_size().height+style->get_center_size().height)));
  				*/
  
  				float areasize = size.width - grabber->get_size().width;
  				if (ticks > 1) {
  					int tickarea = size.width - tick->get_width();
  					for (int i = 0; i < ticks; i++) {
  						if ((!ticks_on_borders) && ((i == 0) || ((i + 1) == ticks))) continue;
  						int ofs = i * tickarea / (ticks - 1);
  						tick->draw(ci, Point2(ofs, 0));
  					}
  				}
  				grabber->draw(ci, Point2i(get_as_ratio() * areasize, size.height / 2 - grabber->get_size().height / 2));
  			}
  
  		} break;
  	}
  }
  
  void Slider::set_custom_step(float p_custom_step) {
  
  	custom_step = p_custom_step;
  }
  
  float Slider::get_custom_step() const {
  
  	return custom_step;
  }
  
  void Slider::set_ticks(int p_count) {
  
  	ticks = p_count;
  	update();
  }
  
  int Slider::get_ticks() const {
  
  	return ticks;
  }
  
  bool Slider::get_ticks_on_borders() const {
  	return ticks_on_borders;
  }
  
  void Slider::set_ticks_on_borders(bool _tob) {
  	ticks_on_borders = _tob;
  	update();
  }
  
  void Slider::_bind_methods() {
  
  	ClassDB::bind_method(D_METHOD("_gui_input"), &Slider::_gui_input);
  	ClassDB::bind_method(D_METHOD("set_ticks", "count"), &Slider::set_ticks);
  	ClassDB::bind_method(D_METHOD("get_ticks"), &Slider::get_ticks);
  
  	ClassDB::bind_method(D_METHOD("get_ticks_on_borders"), &Slider::get_ticks_on_borders);
  	ClassDB::bind_method(D_METHOD("set_ticks_on_borders", "ticks_on_border"), &Slider::set_ticks_on_borders);
  
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "tick_count", PROPERTY_HINT_RANGE, "0,4096,1"), "set_ticks", "get_ticks");
  	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "ticks_on_borders"), "set_ticks_on_borders", "get_ticks_on_borders");
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "focus_mode", PROPERTY_HINT_ENUM, "None,Click,All"), "set_focus_mode", "get_focus_mode");
  }
  
  Slider::Slider(Orientation p_orientation) {
  	orientation = p_orientation;
  	mouse_inside = false;
  	grab.active = false;
  	ticks = 0;
  	custom_step = -1;
  	set_focus_mode(FOCUS_ALL);
  }
  