text: /*************************************************************************/
  /*  texture_region_editor_plugin.cpp                                     */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2020 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 "texture_region_editor_plugin.h"
  
  #include "core/core_string_names.h"
  #include "core/input/input_filter.h"
  #include "core/os/keyboard.h"
  #include "editor/editor_scale.h"
  #include "scene/gui/check_box.h"
  
  /**
  	@author Mariano Suligoy
  */
  
  void draw_margin_line(Control *edit_draw, Vector2 from, Vector2 to) {
  	Vector2 line = (to - from).normalized() * 10;
  	while ((to - from).length_squared() > 200) {
  		edit_draw->draw_line(from, from + line, EditorNode::get_singleton()->get_theme_base()->get_theme_color("mono_color", "Editor"), 2);
  		from += line * 2;
  	}
  }
  
  void TextureRegionEditor::_region_draw() {
  	Ref<Texture2D> base_tex = NULL;
  	if (node_sprite)
  		base_tex = node_sprite->get_texture();
  	else if (node_sprite_3d)
  		base_tex = node_sprite_3d->get_texture();
  	else if (node_ninepatch)
  		base_tex = node_ninepatch->get_texture();
  	else if (obj_styleBox.is_valid())
  		base_tex = obj_styleBox->get_texture();
  	else if (atlas_tex.is_valid())
  		base_tex = atlas_tex->get_atlas();
  
  	if (base_tex.is_null())
  		return;
  
  	Transform2D mtx;
  	mtx.elements[2] = -draw_ofs * draw_zoom;
  	mtx.scale_basis(Vector2(draw_zoom, draw_zoom));
  
  	RS::get_singleton()->canvas_item_add_set_transform(edit_draw->get_canvas_item(), mtx);
  	edit_draw->draw_texture(base_tex, Point2());
  	RS::get_singleton()->canvas_item_add_set_transform(edit_draw->get_canvas_item(), Transform2D());
  
  	if (snap_mode == SNAP_GRID) {
  		Color grid_color = Color(1.0, 1.0, 1.0, 0.15);
  		Size2 s = edit_draw->get_size();
  		int last_cell = 0;
  
  		if (snap_step.x != 0) {
  			if (snap_separation.x == 0)
  				for (int i = 0; i < s.width; i++) {
  					int cell = Math::fast_ftoi(Math::floor((mtx.affine_inverse().xform(Vector2(i, 0)).x - snap_offset.x) / snap_step.x));
  					if (i == 0)
  						last_cell = cell;
  					if (last_cell != cell)
  						edit_draw->draw_line(Point2(i, 0), Point2(i, s.height), grid_color);
  					last_cell = cell;
  				}
  			else
  				for (int i = 0; i < s.width; i++) {
  					int cell = Math::fast_ftoi(Math::floor((mtx.affine_inverse().xform(Vector2(i, 0)).x - snap_offset.x) / (snap_step.x + snap_separation.x)));
  					if (i == 0)
  						last_cell = cell;
  					if (last_cell != cell)
  						edit_draw->draw_rect(Rect2(i - snap_separation.x * draw_zoom, 0, snap_separation.x * draw_zoom, s.height), grid_color);
  					last_cell = cell;
  				}
  		}
  
  		if (snap_step.y != 0) {
  			if (snap_separation.y == 0)
  				for (int i = 0; i < s.height; i++) {
  					int cell = Math::fast_ftoi(Math::floor((mtx.affine_inverse().xform(Vector2(0, i)).y - snap_offset.y) / snap_step.y));
  					if (i == 0)
  						last_cell = cell;
  					if (last_cell != cell)
  						edit_draw->draw_line(Point2(0, i), Point2(s.width, i), grid_color);
  					last_cell = cell;
  				}
  			else
  				for (int i = 0; i < s.height; i++) {
  					int cell = Math::fast_ftoi(Math::floor((mtx.affine_inverse().xform(Vector2(0, i)).y - snap_offset.y) / (snap_step.y + snap_separation.y)));
  					if (i == 0)
  						last_cell = cell;
  					if (last_cell != cell)
  						edit_draw->draw_rect(Rect2(0, i - snap_separation.y * draw_zoom, s.width, snap_separation.y * draw_zoom), grid_color);
  					last_cell = cell;
  				}
  		}
  	} else if (snap_mode == SNAP_AUTOSLICE) {
  		for (List<Rect2>::Element *E = autoslice_cache.front(); E; E = E->next()) {
  			Rect2 r = E->get();
  			Vector2 endpoints[4] = {
  				mtx.basis_xform(r.position),
  				mtx.basis_xform(r.position + Vector2(r.size.x, 0)),
  				mtx.basis_xform(r.position + r.size),
  				mtx.basis_xform(r.position + Vector2(0, r.size.y))
  			};
  			for (int i = 0; i < 4; i++) {
  				int next = (i + 1) % 4;
  				edit_draw->draw_line(endpoints[i] - draw_ofs * draw_zoom, endpoints[next] - draw_ofs * draw_zoom, Color(0.3, 0.7, 1, 1), 2);
  			}
  		}
  	}
  
  	Ref<Texture2D> select_handle = get_theme_icon("EditorHandle", "EditorIcons");
  
  	Rect2 scroll_rect(Point2(), base_tex->get_size());
  
  	const Vector2 raw_endpoints[4] = {
  		rect.position,
  		rect.position + Vector2(rect.size.x, 0),
  		rect.position + rect.size,
  		rect.position + Vector2(0, rect.size.y)
  	};
  	const Vector2 endpoints[4] = {
  		mtx.basis_xform(raw_endpoints[0]),
  		mtx.basis_xform(raw_endpoints[1]),
  		mtx.basis_xform(raw_endpoints[2]),
  		mtx.basis_xform(raw_endpoints[3])
  	};
  	Color color = get_theme_color("mono_color", "Editor");
  	for (int i = 0; i < 4; i++) {
  
  		int prev = (i + 3) % 4;
  		int next = (i + 1) % 4;
  
  		Vector2 ofs = ((endpoints[i] - endpoints[prev]).normalized() + ((endpoints[i] - endpoints[next]).normalized())).normalized();
  		ofs *= Math_SQRT2 * (select_handle->get_size().width / 2);
  
  		edit_draw->draw_line(endpoints[i] - draw_ofs * draw_zoom, endpoints[next] - draw_ofs * draw_zoom, color, 2);
  
  		if (snap_mode != SNAP_AUTOSLICE)
  			edit_draw->draw_texture(select_handle, (endpoints[i] + ofs - (select_handle->get_size() / 2)).floor() - draw_ofs * draw_zoom);
  
  		ofs = (endpoints[next] - endpoints[i]) / 2;
  		ofs += (endpoints[next] - endpoints[i]).tangent().normalized() * (select_handle->get_size().width / 2);
  
  		if (snap_mode != SNAP_AUTOSLICE)
  			edit_draw->draw_texture(select_handle, (endpoints[i] + ofs - (select_handle->get_size() / 2)).floor() - draw_ofs * draw_zoom);
  
  		scroll_rect.expand_to(raw_endpoints[i]);
  	}
  
  	const Size2 scroll_margin = edit_draw->get_size() / draw_zoom;
  	scroll_rect.position -= scroll_margin;
  	scroll_rect.size += scroll_margin * 2;
  
  	updating_scroll = true;
  
  	hscroll->set_min(scroll_rect.position.x);
  	hscroll->set_max(scroll_rect.position.x + scroll_rect.size.x);
  	if (ABS(scroll_rect.position.x - (scroll_rect.position.x + scroll_rect.size.x)) <= scroll_margin.x) {
  		hscroll->hide();
  	} else {
  		hscroll->show();
  		hscroll->set_page(scroll_margin.x);
  		hscroll->set_value(draw_ofs.x);
  	}
  
  	vscroll->set_min(scroll_rect.position.y);
  	vscroll->set_max(scroll_rect.position.y + scroll_rect.size.y);
  	if (ABS(scroll_rect.position.y - (scroll_rect.position.y + scroll_rect.size.y)) <= scroll_margin.y) {
  		vscroll->hide();
  		draw_ofs.y = scroll_rect.position.y;
  	} else {
  		vscroll->show();
  		vscroll->set_page(scroll_margin.y);
  		vscroll->set_value(draw_ofs.y);
  	}
  
  	Size2 hmin = hscroll->get_combined_minimum_size();
  	Size2 vmin = vscroll->get_combined_minimum_size();
  
  	// Avoid scrollbar overlapping.
  	hscroll->set_anchor_and_margin(MARGIN_RIGHT, ANCHOR_END, vscroll->is_visible() ? -vmin.width : 0);
  	vscroll->set_anchor_and_margin(MARGIN_BOTTOM, ANCHOR_END, hscroll->is_visible() ? -hmin.height : 0);
  
  	updating_scroll = false;
  
  	if (node_ninepatch || obj_styleBox.is_valid()) {
  		float margins[4] = { 0 };
  		if (node_ninepatch) {
  			margins[0] = node_ninepatch->get_patch_margin(MARGIN_TOP);
  			margins[1] = node_ninepatch->get_patch_margin(MARGIN_BOTTOM);
  			margins[2] = node_ninepatch->get_patch_margin(MARGIN_LEFT);
  			margins[3] = node_ninepatch->get_patch_margin(MARGIN_RIGHT);
  		} else if (obj_styleBox.is_valid()) {
  			margins[0] = obj_styleBox->get_margin_size(MARGIN_TOP);
  			margins[1] = obj_styleBox->get_margin_size(MARGIN_BOTTOM);
  			margins[2] = obj_styleBox->get_margin_size(MARGIN_LEFT);
  			margins[3] = obj_styleBox->get_margin_size(MARGIN_RIGHT);
  		}
  
  		Vector2 pos[4] = {
  			mtx.basis_xform(Vector2(0, margins[0])) + Vector2(0, endpoints[0].y - draw_ofs.y * draw_zoom),
  			-mtx.basis_xform(Vector2(0, margins[1])) + Vector2(0, endpoints[2].y - draw_ofs.y * draw_zoom),
  			mtx.basis_xform(Vector2(margins[2], 0)) + Vector2(endpoints[0].x - draw_ofs.x * draw_zoom, 0),
  			-mtx.basis_xform(Vector2(margins[3], 0)) + Vector2(endpoints[2].x - draw_ofs.x * draw_zoom, 0)
  		};
  
  		draw_margin_line(edit_draw, pos[0], pos[0] + Vector2(edit_draw->get_size().x, 0));
  		draw_margin_line(edit_draw, pos[1], pos[1] + Vector2(edit_draw->get_size().x, 0));
  		draw_margin_line(edit_draw, pos[2], pos[2] + Vector2(0, edit_draw->get_size().y));
  		draw_margin_line(edit_draw, pos[3], pos[3] + Vector2(0, edit_draw->get_size().y));
  	}
  }
  
  void TextureRegionEditor::_region_input(const Ref<InputEvent> &p_input) {
  	Transform2D mtx;
  	mtx.elements[2] = -draw_ofs * draw_zoom;
  	mtx.scale_basis(Vector2(draw_zoom, draw_zoom));
  
  	const real_t handle_radius = 8 * EDSCALE;
  	const real_t handle_offset = 4 * EDSCALE;
  
  	// Position of selection handles.
  	const Vector2 endpoints[8] = {
  		mtx.xform(rect.position) + Vector2(-handle_offset, -handle_offset),
  		mtx.xform(rect.position + Vector2(rect.size.x / 2, 0)) + Vector2(0, -handle_offset),
  		mtx.xform(rect.position + Vector2(rect.size.x, 0)) + Vector2(handle_offset, -handle_offset),
  		mtx.xform(rect.position + Vector2(rect.size.x, rect.size.y / 2)) + Vector2(handle_offset, 0),
  		mtx.xform(rect.position + rect.size) + Vector2(handle_offset, handle_offset),
  		mtx.xform(rect.position + Vector2(rect.size.x / 2, rect.size.y)) + Vector2(0, handle_offset),
  		mtx.xform(rect.position + Vector2(0, rect.size.y)) + Vector2(-handle_offset, handle_offset),
  		mtx.xform(rect.position + Vector2(0, rect.size.y / 2)) + Vector2(-handle_offset, 0)
  	};
  
  	Ref<InputEventMouseButton> mb = p_input;
  	if (mb.is_valid()) {
  
  		if (mb->get_button_index() == BUTTON_LEFT) {
  
  			if (mb->is_pressed()) {
  				if (node_ninepatch || obj_styleBox.is_valid()) {
  					edited_margin = -1;
  					float margins[4] = { 0 };
  					if (node_ninepatch) {
  						margins[0] = node_ninepatch->get_patch_margin(MARGIN_TOP);
  						margins[1] = node_ninepatch->get_patch_margin(MARGIN_BOTTOM);
  						margins[2] = node_ninepatch->get_patch_margin(MARGIN_LEFT);
  						margins[3] = node_ninepatch->get_patch_margin(MARGIN_RIGHT);
  					} else if (obj_styleBox.is_valid()) {
  						margins[0] = obj_styleBox->get_margin_size(MARGIN_TOP);
  						margins[1] = obj_styleBox->get_margin_size(MARGIN_BOTTOM);
  						margins[2] = obj_styleBox->get_margin_size(MARGIN_LEFT);
  						margins[3] = obj_styleBox->get_margin_size(MARGIN_RIGHT);
  					}
  
  					Vector2 pos[4] = {
  						mtx.basis_xform(rect.position + Vector2(0, margins[0])) - draw_ofs * draw_zoom,
  						mtx.basis_xform(rect.position + rect.size - Vector2(0, margins[1])) - draw_ofs * draw_zoom,
  						mtx.basis_xform(rect.position + Vector2(margins[2], 0)) - draw_ofs * draw_zoom,
  						mtx.basis_xform(rect.position + rect.size - Vector2(margins[3], 0)) - draw_ofs * draw_zoom
  					};
  					if (Math::abs(mb->get_position().y - pos[0].y) < 8) {
  						edited_margin = 0;
  						prev_margin = margins[0];
  					} else if (Math::abs(mb->get_position().y - pos[1].y) < 8) {
  						edited_margin = 1;
  						prev_margin = margins[1];
  					} else if (Math::abs(mb->get_position().x - pos[2].x) < 8) {
  						edited_margin = 2;
  						prev_margin = margins[2];
  					} else if (Math::abs(mb->get_position().x - pos[3].x) < 8) {
  						edited_margin = 3;
  						prev_margin = margins[3];
  					}
  					if (edited_margin >= 0) {
  						drag_from = Vector2(mb->get_position().x, mb->get_position().y);
  						drag = true;
  					}
  				}
  				if (edited_margin < 0 && snap_mode == SNAP_AUTOSLICE) {
  					Vector2 point = mtx.affine_inverse().xform(Vector2(mb->get_position().x, mb->get_position().y));
  					for (List<Rect2>::Element *E = autoslice_cache.front(); E; E = E->next()) {
  						if (E->get().has_point(point)) {
  							rect = E->get();
  							if (InputFilter::get_singleton()->is_key_pressed(KEY_CONTROL) && !(InputFilter::get_singleton()->is_key_pressed(KEY_SHIFT | KEY_ALT))) {
  								Rect2 r;
  								if (node_sprite)
  									r = node_sprite->get_region_rect();
  								else if (node_sprite_3d)
  									r = node_sprite_3d->get_region_rect();
  								else if (node_ninepatch)
  									r = node_ninepatch->get_region_rect();
  								else if (obj_styleBox.is_valid())
  									r = obj_styleBox->get_region_rect();
  								else if (atlas_tex.is_valid())
  									r = atlas_tex->get_region();
  								rect.expand_to(r.position);
  								rect.expand_to(r.position + r.size);
  							}
  							undo_redo->create_action(TTR("Set Region Rect"));
  							if (node_sprite) {
  								undo_redo->add_do_method(node_sprite, "set_region_rect", rect);
  								undo_redo->add_undo_method(node_sprite, "set_region_rect", node_sprite->get_region_rect());
  							} else if (node_sprite_3d) {
  								undo_redo->add_do_method(node_sprite_3d, "set_region_rect", rect);
  								undo_redo->add_undo_method(node_sprite_3d, "set_region_rect", node_sprite_3d->get_region_rect());
  							} else if (node_ninepatch) {
  								undo_redo->add_do_method(node_ninepatch, "set_region_rect", rect);
  								undo_redo->add_undo_method(node_ninepatch, "set_region_rect", node_ninepatch->get_region_rect());
  							} else if (obj_styleBox.is_valid()) {
  								undo_redo->add_do_method(obj_styleBox.ptr(), "set_region_rect", rect);
  								undo_redo->add_undo_method(obj_styleBox.ptr(), "set_region_rect", obj_styleBox->get_region_rect());
  							} else if (atlas_tex.is_valid()) {
  								undo_redo->add_do_method(atlas_tex.ptr(), "set_region", rect);
  								undo_redo->add_undo_method(atlas_tex.ptr(), "set_region", atlas_tex->get_region());
  							}
  							undo_redo->add_do_method(this, "_update_rect");
  							undo_redo->add_undo_method(this, "_update_rect");
  							undo_redo->add_do_method(edit_draw, "update");
  							undo_redo->add_undo_method(edit_draw, "update");
  							undo_redo->commit_action();
  							break;
  						}
  					}
  				} else if (edited_margin < 0) {
  					drag_from = mtx.affine_inverse().xform(Vector2(mb->get_position().x, mb->get_position().y));
  					if (snap_mode == SNAP_PIXEL)
  						drag_from = drag_from.snapped(Vector2(1, 1));
  					else if (snap_mode == SNAP_GRID)
  						drag_from = snap_point(drag_from);
  					drag = true;
  					if (node_sprite)
  						rect_prev = node_sprite->get_region_rect();
  					else if (node_sprite_3d)
  						rect_prev = node_sprite_3d->get_region_rect();
  					else if (node_ninepatch)
  						rect_prev = node_ninepatch->get_region_rect();
  					else if (obj_styleBox.is_valid())
  						rect_prev = obj_styleBox->get_region_rect();
  					else if (atlas_tex.is_valid())
  						rect_prev = atlas_tex->get_region();
  
  					for (int i = 0; i < 8; i++) {
  						Vector2 tuv = endpoints[i];
  						if (tuv.distance_to(Vector2(mb->get_position().x, mb->get_position().y)) < handle_radius) {
  							drag_index = i;
  						}
  					}
  
  					if (drag_index == -1) {
  						creating = true;
  						rect = Rect2(drag_from, Size2());
  					}
  				}
  
  			} else if (drag) {
  				if (edited_margin >= 0) {
  					undo_redo->create_action(TTR("Set Margin"));
  					static Margin m[4] = { MARGIN_TOP, MARGIN_BOTTOM, MARGIN_LEFT, MARGIN_RIGHT };
  					if (node_ninepatch) {
  						undo_redo->add_do_method(node_ninepatch, "set_patch_margin", m[edited_margin], node_ninepatch->get_patch_margin(m[edited_margin]));
  						undo_redo->add_undo_method(node_ninepatch, "set_patch_margin", m[edited_margin], prev_margin);
  					} else if (obj_styleBox.is_valid()) {
  						undo_redo->add_do_method(obj_styleBox.ptr(), "set_margin_size", m[edited_margin], obj_styleBox->get_margin_size(m[edited_margin]));
  						undo_redo->add_undo_method(obj_styleBox.ptr(), "set_margin_size", m[edited_margin], prev_margin);
  						obj_styleBox->emit_signal(CoreStringNames::get_singleton()->changed);
  					}
  					edited_margin = -1;
  				} else {
  					undo_redo->create_action(TTR("Set Region Rect"));
  					if (node_sprite) {
  						undo_redo->add_do_method(node_sprite, "set_region_rect", node_sprite->get_region_rect());
  						undo_redo->add_undo_method(node_sprite, "set_region_rect", rect_prev);
  					} else if (node_sprite_3d) {
  						undo_redo->add_do_method(node_sprite_3d, "set_region_rect", node_sprite_3d->get_region_rect());
  						undo_redo->add_undo_method(node_sprite_3d, "set_region_rect", rect_prev);
  					} else if (atlas_tex.is_valid()) {
  						undo_redo->add_do_method(atlas_tex.ptr(), "set_region", atlas_tex->get_region());
  						undo_redo->add_undo_method(atlas_tex.ptr(), "set_region", rect_prev);
  					} else if (node_ninepatch) {
  						undo_redo->add_do_method(node_ninepatch, "set_region_rect", node_ninepatch->get_region_rect());
  						undo_redo->add_undo_method(node_ninepatch, "set_region_rect", rect_prev);
  					} else if (obj_styleBox.is_valid()) {
  						undo_redo->add_do_method(obj_styleBox.ptr(), "set_region_rect", obj_styleBox->get_region_rect());
  						undo_redo->add_undo_method(obj_styleBox.ptr(), "set_region_rect", rect_prev);
  					}
  					drag_index = -1;
  				}
  				undo_redo->add_do_method(this, "_update_rect");
  				undo_redo->add_undo_method(this, "_update_rect");
  				undo_redo->add_do_method(edit_draw, "update");
  				undo_redo->add_undo_method(edit_draw, "update");
  				undo_redo->commit_action();
  				drag = false;
  				creating = false;
  			}
  
  		} else if (mb->get_button_index() == BUTTON_RIGHT && mb->is_pressed()) {
  
  			if (drag) {
  				drag = false;
  				if (edited_margin >= 0) {
  					static Margin m[4] = { MARGIN_TOP, MARGIN_BOTTOM, MARGIN_LEFT, MARGIN_RIGHT };
  					if (node_ninepatch)
  						node_ninepatch->set_patch_margin(m[edited_margin], prev_margin);
  					if (obj_styleBox.is_valid())
  						obj_styleBox->set_margin_size(m[edited_margin], prev_margin);
  					edited_margin = -1;
  				} else {
  					apply_rect(rect_prev);
  					rect = rect_prev;
  					edit_draw->update();
  					drag_index = -1;
  				}
  			}
  		} else if (mb->get_button_index() == BUTTON_WHEEL_UP && mb->is_pressed()) {
  			_zoom_on_position(draw_zoom * ((0.95 + (0.05 * mb->get_factor())) / 0.95), mb->get_position());
  		} else if (mb->get_button_index() == BUTTON_WHEEL_DOWN && mb->is_pressed()) {
  			_zoom_on_position(draw_zoom * (1 - (0.05 * mb->get_factor())), mb->get_position());
  		}
  	}
  
  	Ref<InputEventMouseMotion> mm = p_input;
  
  	if (mm.is_valid()) {
  
  		if (mm->get_button_mask() & BUTTON_MASK_MIDDLE || InputFilter::get_singleton()->is_key_pressed(KEY_SPACE)) {
  
  			Vector2 dragged(mm->get_relative().x / draw_zoom, mm->get_relative().y / draw_zoom);
  			hscroll->set_value(hscroll->get_value() - dragged.x);
  			vscroll->set_value(vscroll->get_value() - dragged.y);
  
  		} else if (drag) {
  
  			if (edited_margin >= 0) {
  				float new_margin = 0;
  				if (edited_margin == 0)
  					new_margin = prev_margin + (mm->get_position().y - drag_from.y) / draw_zoom;
  				else if (edited_margin == 1)
  					new_margin = prev_margin - (mm->get_position().y - drag_from.y) / draw_zoom;
  				else if (edited_margin == 2)
  					new_margin = prev_margin + (mm->get_position().x - drag_from.x) / draw_zoom;
  				else if (edited_margin == 3)
  					new_margin = prev_margin - (mm->get_position().x - drag_from.x) / draw_zoom;
  				else
  					ERR_PRINT("Unexpected edited_margin");
  
  				if (new_margin < 0)
  					new_margin = 0;
  				static Margin m[4] = { MARGIN_TOP, MARGIN_BOTTOM, MARGIN_LEFT, MARGIN_RIGHT };
  				if (node_ninepatch)
  					node_ninepatch->set_patch_margin(m[edited_margin], new_margin);
  				if (obj_styleBox.is_valid())
  					obj_styleBox->set_margin_size(m[edited_margin], new_margin);
  			} else {
  				Vector2 new_pos = mtx.affine_inverse().xform(mm->get_position());
  				if (snap_mode == SNAP_PIXEL)
  					new_pos = new_pos.snapped(Vector2(1, 1));
  				else if (snap_mode == SNAP_GRID)
  					new_pos = snap_point(new_pos);
  
  				if (creating) {
  					rect = Rect2(drag_from, Size2());
  					rect.expand_to(new_pos);
  					apply_rect(rect);
  					edit_draw->update();
  					return;
  				}
  
  				switch (drag_index) {
  					case 0: {
  						Vector2 p = rect_prev.position + rect_prev.size;
  						rect = Rect2(p, Size2());
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  					case 1: {
  						Vector2 p = rect_prev.position + Vector2(0, rect_prev.size.y);
  						rect = Rect2(p, Size2(rect_prev.size.x, 0));
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  					case 2: {
  						Vector2 p = rect_prev.position + Vector2(0, rect_prev.size.y);
  						rect = Rect2(p, Size2());
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  					case 3: {
  						Vector2 p = rect_prev.position;
  						rect = Rect2(p, Size2(0, rect_prev.size.y));
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  					case 4: {
  						Vector2 p = rect_prev.position;
  						rect = Rect2(p, Size2());
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  					case 5: {
  						Vector2 p = rect_prev.position;
  						rect = Rect2(p, Size2(rect_prev.size.x, 0));
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  					case 6: {
  						Vector2 p = rect_prev.position + Vector2(rect_prev.size.x, 0);
  						rect = Rect2(p, Size2());
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  					case 7: {
  						Vector2 p = rect_prev.position + Vector2(rect_prev.size.x, 0);
  						rect = Rect2(p, Size2(0, rect_prev.size.y));
  						rect.expand_to(new_pos);
  						apply_rect(rect);
  					} break;
  				}
  			}
  			edit_draw->update();
  		}
  	}
  
  	Ref<InputEventMagnifyGesture> magnify_gesture = p_input;
  	if (magnify_gesture.is_valid()) {
  		_zoom_on_position(draw_zoom * magnify_gesture->get_factor(), magnify_gesture->get_position());
  	}
  
  	Ref<InputEventPanGesture> pan_gesture = p_input;
  	if (pan_gesture.is_valid()) {
  		hscroll->set_value(hscroll->get_value() + hscroll->get_page() * pan_gesture->get_delta().x / 8);
  		vscroll->set_value(vscroll->get_value() + vscroll->get_page() * pan_gesture->get_delta().y / 8);
  	}
  }
  
  void TextureRegionEditor::_scroll_changed(float) {
  	if (updating_scroll)
  		return;
  
  	draw_ofs.x = hscroll->get_value();
  	draw_ofs.y = vscroll->get_value();
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_set_snap_mode(int p_mode) {
  	snap_mode = p_mode;
  
  	if (snap_mode == SNAP_GRID)
  		hb_grid->show();
  	else
  		hb_grid->hide();
  
  	if (snap_mode == SNAP_AUTOSLICE && is_visible() && autoslice_is_dirty) {
  		_update_autoslice();
  	}
  
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_set_snap_off_x(float p_val) {
  	snap_offset.x = p_val;
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_set_snap_off_y(float p_val) {
  	snap_offset.y = p_val;
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_set_snap_step_x(float p_val) {
  	snap_step.x = p_val;
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_set_snap_step_y(float p_val) {
  	snap_step.y = p_val;
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_set_snap_sep_x(float p_val) {
  	snap_separation.x = p_val;
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_set_snap_sep_y(float p_val) {
  	snap_separation.y = p_val;
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_zoom_on_position(float p_zoom, Point2 p_position) {
  	if (p_zoom < 0.25 || p_zoom > 8)
  		return;
  
  	float prev_zoom = draw_zoom;
  	draw_zoom = p_zoom;
  	Point2 ofs = p_position;
  	ofs = ofs / prev_zoom - ofs / draw_zoom;
  	draw_ofs.x = Math::round(draw_ofs.x + ofs.x);
  	draw_ofs.y = Math::round(draw_ofs.y + ofs.y);
  
  	edit_draw->update();
  }
  
  void TextureRegionEditor::_zoom_in() {
  	_zoom_on_position(draw_zoom * 1.5, edit_draw->get_size() / 2.0);
  }
  
  void TextureRegionEditor::_zoom_reset() {
  	_zoom_on_position(1.0, edit_draw->get_size() / 2.0);
  }
  
  void TextureRegionEditor::_zoom_out() {
  	_zoom_on_position(draw_zoom / 1.5, edit_draw->get_size() / 2.0);
  }
  
  void TextureRegionEditor::apply_rect(const Rect2 &p_rect) {
  	if (node_sprite)
  		node_sprite->set_region_rect(p_rect);
  	else if (node_sprite_3d)
  		node_sprite_3d->set_region_rect(p_rect);
  	else if (node_ninepatch)
  		node_ninepatch->set_region_rect(p_rect);
  	else if (obj_styleBox.is_valid())
  		obj_styleBox->set_region_rect(p_rect);
  	else if (atlas_tex.is_valid())
  		atlas_tex->set_region(p_rect);
  }
  
  void TextureRegionEditor::_update_rect() {
  	if (node_sprite)
  		rect = node_sprite->get_region_rect();
  	else if (node_sprite_3d)
  		rect = node_sprite_3d->get_region_rect();
  	else if (node_ninepatch) {
  		rect = node_ninepatch->get_region_rect();
  		if (rect == Rect2()) {
  			rect = Rect2(Vector2(), node_ninepatch->get_texture()->get_size());
  		}
  	} else if (obj_styleBox.is_valid())
  		rect = obj_styleBox->get_region_rect();
  	else if (atlas_tex.is_valid())
  		rect = atlas_tex->get_region();
  }
  
  void TextureRegionEditor::_update_autoslice() {
  	autoslice_is_dirty = false;
  	autoslice_cache.clear();
  
  	Ref<Texture2D> texture = NULL;
  	if (node_sprite)
  		texture = node_sprite->get_texture();
  	else if (node_sprite_3d)
  		texture = node_sprite_3d->get_texture();
  	else if (node_ninepatch)
  		texture = node_ninepatch->get_texture();
  	else if (obj_styleBox.is_valid())
  		texture = obj_styleBox->get_texture();
  	else if (atlas_tex.is_valid())
  		texture = atlas_tex->get_atlas();
  
  	if (texture.is_null()) {
  		return;
  	}
  
  	for (int y = 0; y < texture->get_height(); y++) {
  		for (int x = 0; x < texture->get_width(); x++) {
  			if (texture->is_pixel_opaque(x, y)) {
  				bool found = false;
  				for (List<Rect2>::Element *E = autoslice_cache.front(); E; E = E->next()) {
  					Rect2 grown = E->get().grow(1.5);
  					if (grown.has_point(Point2(x, y))) {
  						E->get().expand_to(Point2(x, y));
  						E->get().expand_to(Point2(x + 1, y + 1));
  						x = E->get().position.x + E->get().size.x - 1;
  						bool merged = true;
  						while (merged) {
  							merged = false;
  							bool queue_erase = false;
  							for (List<Rect2>::Element *F = autoslice_cache.front(); F; F = F->next()) {
  								if (queue_erase) {
  									autoslice_cache.erase(F->prev());
  									queue_erase = false;
  								}
  								if (F == E)
  									continue;
  								if (E->get().grow(1).intersects(F->get())) {
  									E->get().expand_to(F->get().position);
  									E->get().expand_to(F->get().position + F->get().size);
  									if (F->prev()) {
  										F = F->prev();
  										autoslice_cache.erase(F->next());
  									} else {
  										queue_erase = true;
  										// Can't delete the first rect in the list.
  									}
  									merged = true;
  								}
  							}
  						}
  						found = true;
  						break;
  					}
  				}
  				if (!found) {
  					Rect2 new_rect(x, y, 1, 1);
  					autoslice_cache.push_back(new_rect);
  				}
  			}
  		}
  	}
  	cache_map[texture->get_rid()] = autoslice_cache;
  }
  
  void TextureRegionEditor::_notification(int p_what) {
  	switch (p_what) {
  		case NOTIFICATION_ENTER_TREE:
  		case NOTIFICATION_THEME_CHANGED: {
  			edit_draw->add_theme_style_override("panel", get_theme_stylebox("bg", "Tree"));
  		} break;
  		case NOTIFICATION_READY: {
  			zoom_out->set_icon(get_theme_icon("ZoomLess", "EditorIcons"));
  			zoom_reset->set_icon(get_theme_icon("ZoomReset", "EditorIcons"));
  			zoom_in->set_icon(get_theme_icon("ZoomMore", "EditorIcons"));
  
  			vscroll->set_anchors_and_margins_preset(PRESET_RIGHT_WIDE);
  			hscroll->set_anchors_and_margins_preset(PRESET_BOTTOM_WIDE);
  		} break;
  		case NOTIFICATION_VISIBILITY_CHANGED: {
  			if (snap_mode == SNAP_AUTOSLICE && is_visible() && autoslice_is_dirty) {
  				_update_autoslice();
  			}
  		} break;
  		case NOTIFICATION_WM_FOCUS_IN: {
  			// This happens when the user leaves the Editor and returns,
  			// they could have changed the textures, so the cache is cleared.
  			cache_map.clear();
  			_edit_region();
  		} break;
  	}
  }
  
  void TextureRegionEditor::_node_removed(Object *p_obj) {
  	if (p_obj == node_sprite || p_obj == node_sprite_3d || p_obj == node_ninepatch || p_obj == obj_styleBox.ptr() || p_obj == atlas_tex.ptr()) {
  		node_sprite = NULL;
  		node_sprite_3d = NULL;
  		node_ninepatch = NULL;
  		obj_styleBox = Ref<StyleBox>(NULL);
  		atlas_tex = Ref<AtlasTexture>(NULL);
  		hide();
  	}
  }
  
  void TextureRegionEditor::_bind_methods() {
  	ClassDB::bind_method(D_METHOD("_edit_region"), &TextureRegionEditor::_edit_region);
  	ClassDB::bind_method(D_METHOD("_node_removed"), &TextureRegionEditor::_node_removed);
  	ClassDB::bind_method(D_METHOD("_zoom_on_position"), &TextureRegionEditor::_zoom_on_position);
  	ClassDB::bind_method(D_METHOD("_update_rect"), &TextureRegionEditor::_update_rect);
  }
  
  bool TextureRegionEditor::is_stylebox() {
  	return obj_styleBox.is_valid();
  }
  
  bool TextureRegionEditor::is_atlas_texture() {
  
  	return atlas_tex.is_valid();
  }
  
  bool TextureRegionEditor::is_ninepatch() {
  	return node_ninepatch != NULL;
  }
  
  Sprite3D *TextureRegionEditor::get_sprite_3d() {
  	return node_sprite_3d;
  }
  
  Sprite2D *TextureRegionEditor::get_sprite() {
  	return node_sprite;
  }
  
  void TextureRegionEditor::edit(Object *p_obj) {
  	if (node_sprite)
  		node_sprite->remove_change_receptor(this);
  	if (node_sprite_3d)
  		node_sprite_3d->remove_change_receptor(this);
  	if (node_ninepatch)
  		node_ninepatch->remove_change_receptor(this);
  	if (obj_styleBox.is_valid())
  		obj_styleBox->remove_change_receptor(this);
  	if (atlas_tex.is_valid())
  		atlas_tex->remove_change_receptor(this);
  	if (p_obj) {
  		node_sprite = Object::cast_to<Sprite2D>(p_obj);
  		node_sprite_3d = Object::cast_to<Sprite3D>(p_obj);
  		node_ninepatch = Object::cast_to<NinePatchRect>(p_obj);
  		if (Object::cast_to<StyleBoxTexture>(p_obj))
  			obj_styleBox = Ref<StyleBoxTexture>(Object::cast_to<StyleBoxTexture>(p_obj));
  		if (Object::cast_to<AtlasTexture>(p_obj))
  			atlas_tex = Ref<AtlasTexture>(Object::cast_to<AtlasTexture>(p_obj));
  		p_obj->add_change_receptor(this);
  		_edit_region();
  	} else {
  		node_sprite = NULL;
  		node_sprite_3d = NULL;
  		node_ninepatch = NULL;
  		obj_styleBox = Ref<StyleBoxTexture>(NULL);
  		atlas_tex = Ref<AtlasTexture>(NULL);
  	}
  	edit_draw->update();
  	if ((node_sprite && !node_sprite->is_region()) || (node_sprite_3d && !node_sprite_3d->is_region())) {
  		set_process(true);
  	}
  	if (!p_obj) {
  		set_process(false);
  	}
  }
  
  void TextureRegionEditor::_changed_callback(Object *p_changed, const char *p_prop) {
  
  	if (!is_visible())
  		return;
  	if (p_prop == StringName("atlas") || p_prop == StringName("texture"))
  		_edit_region();
  }
  
  void TextureRegionEditor::_edit_region() {
  	Ref<Texture2D> texture = NULL;
  	if (node_sprite)
  		texture = node_sprite->get_texture();
  	else if (node_sprite_3d)
  		texture = node_sprite_3d->get_texture();
  	else if (node_ninepatch)
  		texture = node_ninepatch->get_texture();
  	else if (obj_styleBox.is_valid())
  		texture = obj_styleBox->get_texture();
  	else if (atlas_tex.is_valid())
  		texture = atlas_tex->get_atlas();
  
  	if (texture.is_null()) {
  		_zoom_reset();
  		hscroll->hide();
  		vscroll->hide();
  		edit_draw->update();
  		return;
  	}
  
  	if (cache_map.has(texture->get_rid())) {
  		autoslice_cache = cache_map[texture->get_rid()];
  		autoslice_is_dirty = false;
  		return;
  	} else {
  		if (is_visible() && snap_mode == SNAP_AUTOSLICE) {
  			_update_autoslice();
  		} else {
  			autoslice_is_dirty = true;
  		}
  	}
  
  	_update_rect();
  	edit_draw->update();
  }
  
  Vector2 TextureRegionEditor::snap_point(Vector2 p_target) const {
  	if (snap_mode == SNAP_GRID) {
  		p_target.x = Math::snap_scalar_separation(snap_offset.x, snap_step.x, p_target.x, snap_separation.x);
  		p_target.y = Math::snap_scalar_separation(snap_offset.y, snap_step.y, p_target.y, snap_separation.y);
  	}
  
  	return p_target;
  }
  
  TextureRegionEditor::TextureRegionEditor(EditorNode *p_editor) {
  	node_sprite = NULL;
  	node_sprite_3d = NULL;
  	node_ninepatch = NULL;
  	obj_styleBox = Ref<StyleBoxTexture>(NULL);
  	atlas_tex = Ref<AtlasTexture>(NULL);
  	editor = p_editor;
  	undo_redo = editor->get_undo_redo();
  
  	snap_step = Vector2(10, 10);
  	snap_separation = Vector2(0, 0);
  	snap_mode = SNAP_NONE;
  	edited_margin = -1;
  	drag_index = -1;
  	drag = false;
  
  	HBoxContainer *hb_tools = memnew(HBoxContainer);
  	add_child(hb_tools);
  	hb_tools->add_child(memnew(Label(TTR("Snap Mode:"))));
  
  	snap_mode_button = memnew(OptionButton);
  	hb_tools->add_child(snap_mode_button);
  	snap_mode_button->add_item(TTR("None"), 0);
  	snap_mode_button->add_item(TTR("Pixel Snap"), 1);
  	snap_mode_button->add_item(TTR("Grid Snap"), 2);
  	snap_mode_button->add_item(TTR("Auto Slice"), 3);
  	snap_mode_button->select(0);
  	snap_mode_button->connect("item_selected", callable_mp(this, &TextureRegionEditor::_set_snap_mode));
  
  	hb_grid = memnew(HBoxContainer);
  	hb_tools->add_child(hb_grid);
  
  	hb_grid->add_child(memnew(VSeparator));
  	hb_grid->add_child(memnew(Label(TTR("Offset:"))));
  
  	sb_off_x = memnew(SpinBox);
  	sb_off_x->set_min(-256);
  	sb_off_x->set_max(256);
  	sb_off_x->set_step(1);
  	sb_off_x->set_value(snap_offset.x);
  	sb_off_x->set_suffix("px");
  	sb_off_x->connect("value_changed", callable_mp(this, &TextureRegionEditor::_set_snap_off_x));
  	hb_grid->add_child(sb_off_x);
  
  	sb_off_y = memnew(SpinBox);
  	sb_off_y->set_min(-256);
  	sb_off_y->set_max(256);
  	sb_off_y->set_step(1);
  	sb_off_y->set_value(snap_offset.y);
  	sb_off_y->set_suffix("px");
  	sb_off_y->connect("value_changed", callable_mp(this, &TextureRegionEditor::_set_snap_off_y));
  	hb_grid->add_child(sb_off_y);
  
  	hb_grid->add_child(memnew(VSeparator));
  	hb_grid->add_child(memnew(Label(TTR("Step:"))));
  
  	sb_step_x = memnew(SpinBox);
  	sb_step_x->set_min(-256);
  	sb_step_x->set_max(256);
  	sb_step_x->set_step(1);
  	sb_step_x->set_value(snap_step.x);
  	sb_step_x->set_suffix("px");
  	sb_step_x->connect("value_changed", callable_mp(this, &TextureRegionEditor::_set_snap_step_x));
  	hb_grid->add_child(sb_step_x);
  
  	sb_step_y = memnew(SpinBox);
  	sb_step_y->set_min(-256);
  	sb_step_y->set_max(256);
  	sb_step_y->set_step(1);
  	sb_step_y->set_value(snap_step.y);
  	sb_step_y->set_suffix("px");
  	sb_step_y->connect("value_changed", callable_mp(this, &TextureRegionEditor::_set_snap_step_y));
  	hb_grid->add_child(sb_step_y);
  
  	hb_grid->add_child(memnew(VSeparator));
  	hb_grid->add_child(memnew(Label(TTR("Sep.:"))));
  
  	sb_sep_x = memnew(SpinBox);
  	sb_sep_x->set_min(0);
  	sb_sep_x->set_max(256);
  	sb_sep_x->set_step(1);
  	sb_sep_x->set_value(snap_separation.x);
  	sb_sep_x->set_suffix("px");
  	sb_sep_x->connect("value_changed", callable_mp(this, &TextureRegionEditor::_set_snap_sep_x));
  	hb_grid->add_child(sb_sep_x);
  
  	sb_sep_y = memnew(SpinBox);
  	sb_sep_y->set_min(0);
  	sb_sep_y->set_max(256);
  	sb_sep_y->set_step(1);
  	sb_sep_y->set_value(snap_separation.y);
  	sb_sep_y->set_suffix("px");
  	sb_sep_y->connect("value_changed", callable_mp(this, &TextureRegionEditor::_set_snap_sep_y));
  	hb_grid->add_child(sb_sep_y);
  
  	hb_grid->hide();
  
  	edit_draw = memnew(Panel);
  	add_child(edit_draw);
  	edit_draw->set_v_size_flags(SIZE_EXPAND_FILL);
  	edit_draw->connect("draw", callable_mp(this, &TextureRegionEditor::_region_draw));
  	edit_draw->connect("gui_input", callable_mp(this, &TextureRegionEditor::_region_input));
  
  	draw_zoom = 1.0;
  	edit_draw->set_clip_contents(true);
  
  	HBoxContainer *zoom_hb = memnew(HBoxContainer);
  	edit_draw->add_child(zoom_hb);
  	zoom_hb->set_begin(Point2(5, 5));
  
  	zoom_out = memnew(ToolButton);
  	zoom_out->set_tooltip(TTR("Zoom Out"));
  	zoom_out->connect("pressed", callable_mp(this, &TextureRegionEditor::_zoom_out));
  	zoom_hb->add_child(zoom_out);
  
  	zoom_reset = memnew(ToolButton);
  	zoom_reset->set_tooltip(TTR("Zoom Reset"));
  	zoom_reset->connect("pressed", callable_mp(this, &TextureRegionEditor::_zoom_reset));
  	zoom_hb->add_child(zoom_reset);
  
  	zoom_in = memnew(ToolButton);
  	zoom_in->set_tooltip(TTR("Zoom In"));
  	zoom_in->connect("pressed", callable_mp(this, &TextureRegionEditor::_zoom_in));
  	zoom_hb->add_child(zoom_in);
  
  	vscroll = memnew(VScrollBar);
  	vscroll->set_step(0.001);
  	edit_draw->add_child(vscroll);
  	vscroll->connect("value_changed", callable_mp(this, &TextureRegionEditor::_scroll_changed));
  	hscroll = memnew(HScrollBar);
  	hscroll->set_step(0.001);
  	edit_draw->add_child(hscroll);
  	hscroll->connect("value_changed", callable_mp(this, &TextureRegionEditor::_scroll_changed));
  
  	updating_scroll = false;
  }
  
  void TextureRegionEditorPlugin::edit(Object *p_object) {
  	region_editor->edit(p_object);
  }
  
  bool TextureRegionEditorPlugin::handles(Object *p_object) const {
  	return p_object->is_class("Sprite2D") || p_object->is_class("Sprite3D") || p_object->is_class("NinePatchRect") || p_object->is_class("StyleBoxTexture") || p_object->is_class("AtlasTexture");
  }
  
  void TextureRegionEditorPlugin::_editor_visiblity_changed() {
  	manually_hidden = !region_editor->is_visible_in_tree();
  }
  
  void TextureRegionEditorPlugin::make_visible(bool p_visible) {
  	if (p_visible) {
  		texture_region_button->show();
  		bool is_node_configured = region_editor->is_stylebox() || region_editor->is_atlas_texture() || region_editor->is_ninepatch() || (region_editor->get_sprite() && region_editor->get_sprite()->is_region()) || (region_editor->get_sprite_3d() && region_editor->get_sprite_3d()->is_region());
  		if ((is_node_configured && !manually_hidden) || texture_region_button->is_pressed()) {
  			editor->make_bottom_panel_item_visible(region_editor);
  		}
  	} else {
  		if (region_editor->is_visible_in_tree()) {
  			editor->hide_bottom_panel();
  			manually_hidden = false;
  		}
  		texture_region_button->hide();
  		region_editor->edit(NULL);
  	}
  }
  
  Dictionary TextureRegionEditorPlugin::get_state() const {
  
  	Dictionary state;
  	state["snap_offset"] = region_editor->snap_offset;
  	state["snap_step"] = region_editor->snap_step;
  	state["snap_separation"] = region_editor->snap_separation;
  	state["snap_mode"] = region_editor->snap_mode;
  	return state;
  }
  
  void TextureRegionEditorPlugin::set_state(const Dictionary &p_state) {
  
  	Dictionary state = p_state;
  	if (state.has("snap_step")) {
  		Vector2 s = state["snap_step"];
  		region_editor->sb_step_x->set_value(s.x);
  		region_editor->sb_step_y->set_value(s.y);
  		region_editor->snap_step = s;
  	}
  
  	if (state.has("snap_offset")) {
  		Vector2 ofs = state["snap_offset"];
  		region_editor->sb_off_x->set_value(ofs.x);
  		region_editor->sb_off_y->set_value(ofs.y);
  		region_editor->snap_offset = ofs;
  	}
  
  	if (state.has("snap_separation")) {
  		Vector2 sep = state["snap_separation"];
  		region_editor->sb_sep_x->set_value(sep.x);
  		region_editor->sb_sep_y->set_value(sep.y);
  		region_editor->snap_separation = sep;
  	}
  
  	if (state.has("snap_mode")) {
  		region_editor->_set_snap_mode(state["snap_mode"]);
  		region_editor->snap_mode_button->select(state["snap_mode"]);
  	}
  }
  
  void TextureRegionEditorPlugin::_bind_methods() {
  }
  
  TextureRegionEditorPlugin::TextureRegionEditorPlugin(EditorNode *p_node) {
  	manually_hidden = false;
  	editor = p_node;
  
  	region_editor = memnew(TextureRegionEditor(p_node));
  	region_editor->set_custom_minimum_size(Size2(0, 200) * EDSCALE);
  	region_editor->hide();
  	region_editor->connect("visibility_changed", callable_mp(this, &TextureRegionEditorPlugin::_editor_visiblity_changed));
  
  	texture_region_button = p_node->add_bottom_panel_item(TTR("TextureRegion"), region_editor);
  	texture_region_button->hide();
  }
  