text: /*************************************************************************/
  /*  spin_box.cpp                                                         */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2019 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 "spin_box.h"
  #include "core/os/input.h"
  
  Size2 SpinBox::get_minimum_size() const {
  
  	Size2 ms = line_edit->get_combined_minimum_size();
  	ms.width += last_w;
  	return ms;
  }
  
  void SpinBox::_value_changed(double) {
  
  	String value = String::num(get_value(), Math::step_decimals(get_step()));
  	if (prefix != "")
  		value = prefix + " " + value;
  	if (suffix != "")
  		value += " " + suffix;
  	line_edit->set_text(value);
  }
  
  void SpinBox::_text_entered(const String &p_string) {
  
  	/*
  	if (!p_string.is_numeric())
  		return;
  	*/
  	String value = p_string;
  	if (prefix != "" && p_string.begins_with(prefix))
  		value = p_string.substr(prefix.length(), p_string.length() - prefix.length());
  	set_value(value.to_double());
  	_value_changed(0);
  }
  
  LineEdit *SpinBox::get_line_edit() {
  
  	return line_edit;
  }
  
  void SpinBox::_line_edit_input(const Ref<InputEvent> &p_event) {
  }
  
  void SpinBox::_range_click_timeout() {
  
  	if (!drag.enabled && Input::get_singleton()->is_mouse_button_pressed(BUTTON_LEFT)) {
  
  		bool up = get_local_mouse_position().y < (get_size().height / 2);
  		set_value(get_value() + (up ? get_step() : -get_step()));
  
  		if (range_click_timer->is_one_shot()) {
  			range_click_timer->set_wait_time(0.075);
  			range_click_timer->set_one_shot(false);
  			range_click_timer->start();
  		}
  
  	} else {
  		range_click_timer->stop();
  	}
  }
  
  void SpinBox::_gui_input(const Ref<InputEvent> &p_event) {
  
  	if (!is_editable()) {
  		return;
  	}
  
  	Ref<InputEventMouseButton> mb = p_event;
  
  	if (mb.is_valid() && mb->is_pressed()) {
  
  		bool up = mb->get_position().y < (get_size().height / 2);
  
  		switch (mb->get_button_index()) {
  
  			case BUTTON_LEFT: {
  
  				set_value(get_value() + (up ? get_step() : -get_step()));
  
  				range_click_timer->set_wait_time(0.6);
  				range_click_timer->set_one_shot(true);
  				range_click_timer->start();
  
  				line_edit->grab_focus();
  
  				drag.allowed = true;
  				drag.capture_pos = mb->get_position();
  			} break;
  			case BUTTON_RIGHT: {
  
  				set_value((up ? get_max() : get_min()));
  				line_edit->grab_focus();
  			} break;
  			case BUTTON_WHEEL_UP: {
  				if (line_edit->has_focus()) {
  
  					set_value(get_value() + get_step() * mb->get_factor());
  					accept_event();
  				}
  			} break;
  			case BUTTON_WHEEL_DOWN: {
  				if (line_edit->has_focus()) {
  
  					set_value(get_value() - get_step() * mb->get_factor());
  					accept_event();
  				}
  			} break;
  		}
  	}
  
  	if (mb.is_valid() && !mb->is_pressed() && mb->get_button_index() == BUTTON_LEFT) {
  
  		//set_default_cursor_shape(CURSOR_ARROW);
  		range_click_timer->stop();
  
  		if (drag.enabled) {
  			drag.enabled = false;
  			Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_VISIBLE);
  			warp_mouse(drag.capture_pos);
  		}
  		drag.allowed = false;
  	}
  
  	Ref<InputEventMouseMotion> mm = p_event;
  
  	if (mm.is_valid() && mm->get_button_mask() & BUTTON_MASK_LEFT) {
  
  		if (drag.enabled) {
  
  			drag.diff_y += mm->get_relative().y;
  			float diff_y = -0.01 * Math::pow(ABS(drag.diff_y), 1.8f) * SGN(drag.diff_y);
  			set_value(CLAMP(drag.base_val + get_step() * diff_y, get_min(), get_max()));
  		} else if (drag.allowed && drag.capture_pos.distance_to(mm->get_position()) > 2) {
  
  			Input::get_singleton()->set_mouse_mode(Input::MOUSE_MODE_CAPTURED);
  			drag.enabled = true;
  			drag.base_val = get_value();
  			drag.diff_y = 0;
  		}
  	}
  }
  
  void SpinBox::_line_edit_focus_exit() {
  
  	_text_entered(line_edit->get_text());
  }
  
  inline void SpinBox::_adjust_width_for_icon(const Ref<Texture> icon) {
  
  	int w = icon->get_width();
  	if (w != last_w) {
  		line_edit->set_margin(MARGIN_RIGHT, -w);
  		last_w = w;
  	}
  }
  
  void SpinBox::_notification(int p_what) {
  
  	if (p_what == NOTIFICATION_DRAW) {
  
  		Ref<Texture> updown = get_icon("updown");
  
  		_adjust_width_for_icon(updown);
  
  		RID ci = get_canvas_item();
  		Size2i size = get_size();
  
  		updown->draw(ci, Point2i(size.width - updown->get_width(), (size.height - updown->get_height()) / 2));
  
  	} else if (p_what == NOTIFICATION_FOCUS_EXIT) {
  
  		//_value_changed(0);
  	} else if (p_what == NOTIFICATION_ENTER_TREE) {
  
  		_adjust_width_for_icon(get_icon("updown"));
  		_value_changed(0);
  	}
  }
  
  void SpinBox::set_align(LineEdit::Align p_align) {
  
  	line_edit->set_align(p_align);
  }
  
  LineEdit::Align SpinBox::get_align() const {
  
  	return line_edit->get_align();
  }
  
  void SpinBox::set_suffix(const String &p_suffix) {
  
  	suffix = p_suffix;
  	_value_changed(0);
  }
  
  String SpinBox::get_suffix() const {
  
  	return suffix;
  }
  
  void SpinBox::set_prefix(const String &p_prefix) {
  
  	prefix = p_prefix;
  	_value_changed(0);
  }
  
  String SpinBox::get_prefix() const {
  
  	return prefix;
  }
  
  void SpinBox::set_editable(bool p_editable) {
  	line_edit->set_editable(p_editable);
  }
  
  bool SpinBox::is_editable() const {
  
  	return line_edit->is_editable();
  }
  
  void SpinBox::_bind_methods() {
  
  	//ClassDB::bind_method(D_METHOD("_value_changed"),&SpinBox::_value_changed);
  	ClassDB::bind_method(D_METHOD("_gui_input"), &SpinBox::_gui_input);
  	ClassDB::bind_method(D_METHOD("_text_entered"), &SpinBox::_text_entered);
  	ClassDB::bind_method(D_METHOD("set_align", "align"), &SpinBox::set_align);
  	ClassDB::bind_method(D_METHOD("get_align"), &SpinBox::get_align);
  	ClassDB::bind_method(D_METHOD("set_suffix", "suffix"), &SpinBox::set_suffix);
  	ClassDB::bind_method(D_METHOD("get_suffix"), &SpinBox::get_suffix);
  	ClassDB::bind_method(D_METHOD("set_prefix", "prefix"), &SpinBox::set_prefix);
  	ClassDB::bind_method(D_METHOD("get_prefix"), &SpinBox::get_prefix);
  	ClassDB::bind_method(D_METHOD("set_editable", "editable"), &SpinBox::set_editable);
  	ClassDB::bind_method(D_METHOD("is_editable"), &SpinBox::is_editable);
  	ClassDB::bind_method(D_METHOD("_line_edit_focus_exit"), &SpinBox::_line_edit_focus_exit);
  	ClassDB::bind_method(D_METHOD("get_line_edit"), &SpinBox::get_line_edit);
  	ClassDB::bind_method(D_METHOD("_line_edit_input"), &SpinBox::_line_edit_input);
  	ClassDB::bind_method(D_METHOD("_range_click_timeout"), &SpinBox::_range_click_timeout);
  
  	ADD_PROPERTY(PropertyInfo(Variant::INT, "align", PROPERTY_HINT_ENUM, "Left,Center,Right,Fill"), "set_align", "get_align");
  	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "editable"), "set_editable", "is_editable");
  	ADD_PROPERTY(PropertyInfo(Variant::STRING, "prefix"), "set_prefix", "get_prefix");
  	ADD_PROPERTY(PropertyInfo(Variant::STRING, "suffix"), "set_suffix", "get_suffix");
  }
  
  SpinBox::SpinBox() {
  
  	last_w = 0;
  	line_edit = memnew(LineEdit);
  	add_child(line_edit);
  
  	line_edit->set_anchors_and_margins_preset(Control::PRESET_WIDE);
  	//connect("value_changed",this,"_value_changed");
  	line_edit->connect("text_entered", this, "_text_entered", Vector<Variant>(), CONNECT_DEFERRED);
  	line_edit->connect("focus_exited", this, "_line_edit_focus_exit", Vector<Variant>(), CONNECT_DEFERRED);
  	line_edit->connect("gui_input", this, "_line_edit_input");
  	drag.enabled = false;
  
  	range_click_timer = memnew(Timer);
  	range_click_timer->connect("timeout", this, "_range_click_timeout");
  	add_child(range_click_timer);
  }
  