Storing sprites in Entity objects now, moderate ListGUI refactoring to simplify list icons creation. See more in the task description https://trello.com/c/tkAjRpcG

src/gui/ListGUI.java

@@ -43,7 +43,6 @@ public class ListGUI extends JPanel {
 	JButton addListElementEntity;
 	JButton removeListElementEntity;
 	JButton addPicEntity;
-	String pathImage;
 	JList list;
 	JScrollPane scroll;
 	ActionListener removeEntity;
@@ -107,13 +106,15 @@ public class ListGUI extends JPanel {
     }
     
 	public void updateList() {
-		String[] nameList = createNameList();
 		testModel.removeAllElements();
-		for (String name : nameList)
-			testModel.addElement(name);
 		
-		pathImage = Project.getInstance().getXMLPath();
-		createImageMap(nameList);
+		for (Entity e: Project.getInstance()) {
+			testModel.addElement(e.getName());
+
+		    // Create and store JList items icons in a map to prevent their unneccessary re-creation 
+			iconMap.put(e.getName(), createListIconFromSprite( e.getImage() ));
+		}
+		
 		list.updateUI();
 	}
 
@@ -136,7 +137,7 @@ public class ListGUI extends JPanel {
     }
     private final float iconMaxWidth = 40, iconMaxHeight = 40;
 
-	public Icon imageScaling(BufferedImage image) {
+	private Icon createListIconFromSprite(BufferedImage image) {
 		CustomIcon icon = null;
 		try {
 			int imageWidth = image.getWidth(), imageHeight = image.getHeight();
@@ -184,14 +185,6 @@ public class ListGUI extends JPanel {
         }
     }
 
-	private void createImageMap(String[] nameList) {
-		for (int i = 0; i < nameList.length; i++) {
-			String name = nameList[i];
-			BufferedImage image = Project.getInstance().loadImageByName(name);
-			iconMap.put(name, imageScaling(image));
-		}
-	}
-
     private JButton createButton(int width,int height,ActionListener listener,String pathImage) {
 		JButton button = new JButton(new ImageIcon(pathImage));
 		button.setSize(110, 46);

src/model/Entity.java

@@ -1,10 +1,13 @@
 package model;
 
+import java.awt.image.BufferedImage;
+
 public class Entity {
 	private String thisName;
 	private Drawbox thisDrawbox;
 	private Hitbox thisHitbox;
 	private String type;
+	private BufferedImage sprite;
 	
 	public Entity(String name,String drawbox,String hitbox) {
 		thisName = new String(name);
@@ -50,6 +53,19 @@ public class Entity {
 		return thisHitbox;
 	};
 	
+	public Drawbox getThisDrawbox() {
+		return thisDrawbox;
+	}
+	
+	/** @return BufferedImage object or null if an image is not set */
+	public BufferedImage getImage() {
+		return sprite;
+	}
+	
+	public void setImage(BufferedImage sprite) {
+		this.sprite = sprite;
+	}
+	
 	public void PrintEntity() {
 		System.out.println("---------------------");
 		System.out.println("Name: "+thisName);

src/repository/Project.java

@@ -132,6 +132,7 @@ public class Project implements Iterable<Entity>, EntityDrawboxChangedListener {
 		factory = DocumentBuilderFactory.newInstance();
 		builder = factory.newDocumentBuilder();
 		document = builder.parse(new File(path+fileName));
+		// TODO: remove this from Project, it should not know SHIT about MainGUI
 		if(Launcher.getMainGUI() != null) // at the first program launch, main gui creates list gui before static link to main gui is set
 			Launcher.getMainGUI().setTitle("Hitbox/Drawbox Editor: " + path + fileName);
 	    // Получение списка всех элементов objecttype внутри корневого элемента (getDocumentElement возвращает ROOT элемент XML файла).
@@ -144,14 +145,18 @@ public class Project implements Iterable<Entity>, EntityDrawboxChangedListener {
 		}
 	}
 	
-	// эта колбаса парсит сущности из XML в программные объекты внутри модели, является частью внутренней кухни так что обычно её не нужно трогать
 	private void parsingElementXMLtoElementList(String entityName, Node objecttype) {
 		String newDrawbox = null;
 		String newHitbox = null;
 		String type = null;
+		BufferedImage sprite = null;
 		Element element = (Element)objecttype;
 		NodeList propertyElements = element.getElementsByTagName("property");
 		if(propertyElements != null) {
+			
+			// do not lazy load images here - Hitbox parser needs real image sizes
+			sprite = loadImageByName(entityName);
+			
 			for(int i = 0; i < propertyElements.getLength(); i++) {
 				Element property = (Element)propertyElements.item(i);
 				String propertyName = property.getAttribute("name");
@@ -168,8 +173,10 @@ public class Project implements Iterable<Entity>, EntityDrawboxChangedListener {
 						break;
 				}
 			}
+			
 			Entity e = new Entity(entityName, newDrawbox, newHitbox);
 			e.setType(type);
+			e.setImage(sprite);
 			listEntity.add(e);
 		}
 	}
@@ -179,9 +186,6 @@ public class Project implements Iterable<Entity>, EntityDrawboxChangedListener {
 	 * XML-файл. Возвращает null если изображение не найдено.
 	 * */
 	public BufferedImage loadImageByName(String name) {
-		//TODO: сделать кеширование - не дело подгружать одну и ту же картинку по десять раз!
-		
-		String path = Project.getInstance().getXMLPath();
 		String extension = "png";
 		// TODO: изображения следует подгружать в отдельном потоке!
 		
@@ -209,6 +213,9 @@ public class Project implements Iterable<Entity>, EntityDrawboxChangedListener {
 		if(getEntityByName(e.getName()) != null) 
 			throw new DuplicateEntryException("The entity with the name '" + e.getName() + "' already exists!");
 			
+		//TODO: move image loading to AddListElementEntityListener and make it lazy
+		e.setImage(loadImageByName(e.getName()));
+		
 		listEntity.add(e);
 		
 		Element objecttypeElement = document.createElement("objecttype");
@@ -366,7 +373,8 @@ public class Project implements Iterable<Entity>, EntityDrawboxChangedListener {
 	}
 	
 	// https://stackoverflow.com/a/64659614/6929164
-	public static void stripEmptyElements(Node node)
+	// new empty lines will appear on every XML save without this function
+	private static void stripEmptyElements(Node node)
 	{
 	    NodeList children = node.getChildNodes();
 	    for(int i = 0; i < children.getLength(); ++i) {