Base project structure

src/main/java/fr/uha/gabalier/controller/Controller.java

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+package fr.uha.gabalier.controller;
+
+public interface Controller {
+}

src/main/java/fr/uha/gabalier/core/ImageLoader.java

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+package fr.uha.gabalier.core;
+
+import fr.uha.gabalier.util.ImageLib;
+import fr.uha.gabalier.view.Preview;
+
+import javax.swing.*;
+import java.awt.*;
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.CancellationException;
+import java.util.concurrent.ExecutionException;
+
+public class ImageLoader extends SwingWorker<List<Image>, Integer> {
+
+    private final File root;
+    private Preview app;
+    private List<Image> images;
+    private final int iconWidth;
+
+    public ImageLoader(File root, Preview app, int iconWidth) {
+        this.root = root;
+        this.app = app;
+        this.iconWidth = iconWidth;
+        this.images = new ArrayList<>();
+    }
+
+    private void loadImages(File current) throws NullPointerException {
+        if (current.isFile()) {
+            final Image icon = ImageLib.createScaledImage(current, this.iconWidth, -1);
+            if (icon != null) {
+                images.add(icon);
+                publish(images.size());
+            }
+            return;
+        }
+
+        final File[] files = current.listFiles();
+        if (files == null) throw new NullPointerException();
+        for (File f : files) {
+            loadImages(f);
+        }
+    }
+
+    @Override
+    protected List<Image> doInBackground() throws Exception {
+        loadImages(root);
+        return images;
+    }
+
+    @Override
+    protected void process(List<Integer> data) {
+        if (this.isCancelled()) return;
+        app.setStatus(String.valueOf(data.get(data.size() - 1)));
+    }
+
+    @Override
+    protected void done() {
+        try {
+            app.setModel(this.get());
+            app.setStatus(app.getModel().size() + "images loaded");
+        } catch (CancellationException e) {
+            app.setStatus("Cancelled");
+        } catch (InterruptedException | ExecutionException e) {
+            e.printStackTrace();
+        } finally {
+            app.postLoad();
+        }
+    }
+}

src/main/java/fr/uha/gabalier/util/ImageLib.java

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+package fr.uha.gabalier.util;
+
+import java.awt.*;
+import java.io.File;
+
+public final class ImageLib {
+
+    public static Image createScaledImage(File file, int iconWidth, int i) {
+        return null;
+    }
+
+    private ImageLib() {}
+}

src/main/java/fr/uha/gabalier/view/Preview.java

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+package fr.uha.gabalier.view;
+
+import java.awt.*;
+import java.util.List;
+
+public class Preview {
+    private List<Image> model;
+    private String status;
+
+    public void setModel(List<Image> images) {
+        this.model = images;
+    }
+
+    public List<Image> getModel() {
+        return model;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public void postLoad() {
+
+    }
+}

src/main/java/fr/uha/gabalier/view/View.java

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+package fr.uha.gabalier.view;
+
+public interface View {
+}