Image viewer application

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

@@ -1,4 +1,29 @@
 package fr.uha.gabalier.controller;
 
-public interface Controller {
+import fr.uha.gabalier.view.View;
+
+public class Controller<T> {
+
+    private T model;
+    private View view;
+
+    protected Controller(T model) {
+        this.model = model;
+    }
+
+    protected T getModel() {
+        return model;
+    }
+
+    protected void setModel(T model) {
+        this.model = model;
+    }
+
+    protected View getView() {
+        return view;
+    }
+
+    public void setView(View v) {
+        this.view = v;
+    }
 }

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

@@ -0,0 +1,58 @@
+package fr.uha.gabalier.controller;
+
+import fr.uha.gabalier.view.Preview;
+import fr.uha.gabalier.view.View;
+
+import java.awt.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.util.List;
+
+public class ImageController<T> extends Controller<List<Image>> implements ActionListener {
+
+    private int index;
+
+    public ImageController(List<Image> newModel) {
+        super(newModel);
+        this.index = 0;
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent evt) {
+        switch (evt.getActionCommand()) {
+            case Preview.LEFT_COMMAND :
+                doLeft();
+                break;
+            case Preview.RIGHT_COMMAND:
+                doRight();
+                break;
+        }
+    }
+
+    private void doRight() {
+        if (getModel() == null) return;
+        if (getModel().size() == 0) return;
+        if (++index > getModel().size() - 1) index = 0;
+        getView().repaint();
+    }
+
+    private void doLeft() {
+        if (getModel() == null) return;
+        if (getModel().size() == 0) return;
+        if (--index < 0) index = getModel().size() - 1;
+        getView().repaint();
+    }
+
+    public int getIndex() {
+        return index;
+    }
+
+    public void resetIndex() {
+        this.index = 0;
+    }
+
+    public void setModel(List<Image> model) {
+        super.setModel(model);
+        this.index = 0;
+    }
+}

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

@@ -18,7 +18,7 @@ public class ImageLoader extends SwingWorker<List<Image>, Integer> {
     private List<Image> images;
     private final int iconWidth;
 
-    public ImageLoader(File root, Preview app, int iconWidth) {
+    public ImageLoader(Preview app, int iconWidth, File root) {
         this.root = root;
         this.app = app;
         this.iconWidth = iconWidth;
@@ -51,7 +51,7 @@ public class ImageLoader extends SwingWorker<List<Image>, Integer> {
     @Override
     protected void process(List<Integer> data) {
         if (this.isCancelled()) return;
-        app.setStatus(String.valueOf(data.get(data.size() - 1)));
+        app.setStatus(String.valueOf(data.get(data.size() - 1)) + " images loaded");
     }
 
     @Override

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

@@ -1,11 +1,22 @@
 package fr.uha.gabalier.util;
 
+import javax.imageio.ImageIO;
 import java.awt.*;
+import java.awt.image.BufferedImage;
 import java.io.File;
+import java.io.IOException;
 
 public final class ImageLib {
 
-    public static Image createScaledImage(File file, int iconWidth, int i) {
+    public static Image createScaledImage(File file, int iconWidth, int iconHeight) {
+        final BufferedImage img;
+        try {
+            if ((img = ImageIO.read(file)) != null) {
+                return img.getScaledInstance(iconWidth, iconHeight, Image.SCALE_DEFAULT);
+            }
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
         return null;
     }
 

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

@@ -0,0 +1,25 @@
+package fr.uha.gabalier.view;
+
+import fr.uha.gabalier.controller.ImageController;
+
+import java.awt.*;
+import java.util.List;
+
+public class ImageView extends View<List<Image>> {
+
+    public ImageView(List<Image> model) {
+        super(model);
+        this.setPreferredSize(new Dimension(Preview.VIEW_WIDTH, Preview.VIEW_HEIGHT));
+    }
+
+    @Override
+    public void paintComponent(Graphics g) {
+        super.paintComponent(g);
+        final List<Image> model = this.getModel();
+        if (model == null) return;
+        if (model.size() == 0) return;
+
+        final int index = ((ImageController) this.getController()).getIndex();
+        g.drawImage(model.get(index), 10, 10, this);
+    }
+}

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

@@ -1,14 +1,85 @@
 package fr.uha.gabalier.view;
 
+import fr.uha.gabalier.controller.ImageController;
+import fr.uha.gabalier.core.ImageLoader;
+
+import javax.swing.*;
 import java.awt.*;
+import java.awt.event.InputEvent;
+import java.awt.event.KeyEvent;
+import java.util.ArrayList;
 import java.util.List;
 
-public class Preview {
+public class Preview extends JFrame {
+
+    static final int VIEW_WIDTH = 256;
+    static final int VIEW_HEIGHT = 128;
+
+    public static final String LEFT_COMMAND = "<";
+    public static final String RIGHT_COMMAND = ">";
+    private static final int ICON_WIDTH = 256;
+
     private List<Image> model;
-    private String status;
+    private ImageLoader loader;
+    private ImageView imageView;
+
+    // UI elements
+    private JMenuItem loadItem;
+    private JMenuItem cancelItem;
+    private JButton rightNavButton;
+    private JButton leftNavButton;
+    private final JTextField statusText;
+
+    public Preview() throws HeadlessException {
+        model = new ArrayList<>();
+        // UI elements
+        JMenuBar menuBar = new JMenuBar();
+        setJMenuBar(menuBar);
+        JMenu fileMenu = new JMenu("File");
+        menuBar.add(fileMenu);
+
+        loadItem = new JMenuItem("Load");
+        fileMenu.add(loadItem);
+        loadItem.addActionListener(actionEvent -> doLoad());
+        cancelItem = new JMenuItem("Cancel");
+        fileMenu.add(cancelItem);
+        cancelItem.addActionListener(actionEvent -> doCancel());
+        final JMenuItem exitItem = new JMenuItem("Exit");
+        exitItem.addActionListener(actionEvent -> doExit());
+        exitItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, InputEvent.CTRL_DOWN_MASK));
+        fileMenu.add(exitItem);
+
+        setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));
+
+        imageView = new ImageView(model);
+        final ImageController controller = new ImageController(model);
+        imageView.setController(controller);
+        controller.setView(imageView);
+        getContentPane().add(imageView);
+
+        final JPanel navPanel = new JPanel();
+        getContentPane().add(navPanel);
+        leftNavButton = new JButton(LEFT_COMMAND);
+        leftNavButton.addActionListener(controller);
+        navPanel.add(leftNavButton);
+        rightNavButton = new JButton(RIGHT_COMMAND);
+        rightNavButton.addActionListener(controller);
+        navPanel.add(rightNavButton);
+
+        final JPanel statusPanel = new JPanel();
+        getContentPane().add(statusPanel);
+        statusText = new JTextField("0000 images loaded");
+        statusPanel.add(new JLabel("status :"));
+        statusPanel.add(statusText);
+
+        pack();
+        setVisible(true);
+    }
 
     public void setModel(List<Image> images) {
-        this.model = images;
+        this.model.clear();
+        this.model.addAll(images);
+        ((ImageController) imageView.getController()).resetIndex();
     }
 
     public List<Image> getModel() {
@@ -16,10 +87,44 @@ public class Preview {
     }
 
     public void setStatus(String status) {
-        this.status = status;
+        this.statusText.setText(status);
+    }
+
+    private void doLoad() {
+        final JFileChooser fc = new JFileChooser();
+        fc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
+        final int ret = fc.showOpenDialog(this);
+        if (ret == JFileChooser.APPROVE_OPTION) {
+            loader = new ImageLoader(this, ICON_WIDTH, fc.getSelectedFile());
+            preLoad();
+            loader.execute();
+        }
+    }
+
+    private void doExit() {
+        System.exit(0);
+    }
+
+    private void doCancel() {
+        loader.cancel(true);
+    }
+
+    public void preLoad() {
+        loadItem.setEnabled(false);
+        cancelItem.setEnabled(true);
+        rightNavButton.setEnabled(false);
+        leftNavButton.setEnabled(false);
     }
 
     public void postLoad() {
+        loadItem.setEnabled(true);
+        cancelItem.setEnabled(false);
+        rightNavButton.setEnabled(true);
+        leftNavButton.setEnabled(true);
+    }
+
+    public static void main(String[] args) {
+        EventQueue.invokeLater(Preview::new);
+    }
 
 }
-}

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

@@ -1,4 +1,27 @@
 package fr.uha.gabalier.view;
 
-public interface View {
+import fr.uha.gabalier.controller.Controller;
+
+import javax.swing.*;
+
+public class View<T> extends JPanel {
+
+    private final T model;
+    private Controller controller;
+
+    protected View(T model) {
+        this.model = model;
+    }
+
+    protected T getModel() {
+        return model;
+    }
+
+    protected Controller getController() {
+        return controller;
+    }
+
+    protected void setController(Controller controller) {
+        this.controller = controller;
+    }
 }