Add map zoom out limit

src/main/java/edu/project/Store.java

@@ -85,4 +85,29 @@ public void setWeatherForecast5Data(WeatherForecast5Data data) {
 	public void addWeatherForecast5DataListener(Consumer<WeatherForecast5Data> listener) {
 		weatherForecast5DataListeners.add(listener);
 	}
+
+	/* Zoom */
+
+	public void zoomIn() {
+		SwingUtilities.invokeLater(() -> {
+			zoomInListeners.forEach(listener -> listener.run());
+		});
+	}
+
+	public void zoomOut() {
+		SwingUtilities.invokeLater(() -> {
+			zoomOutListeners.forEach(listener -> listener.run());
+		});
+	}
+
+	private ArrayList<Runnable> zoomInListeners = new ArrayList<>();
+	private ArrayList<Runnable> zoomOutListeners = new ArrayList<>();
+
+	public void addZoomInListener(Runnable listener) {
+		zoomInListeners.add(listener);
+	}
+
+	public void addZoomOutListener(Runnable listener) {
+		zoomOutListeners.add(listener);
+	}
 }

src/main/java/edu/project/components/App.java

@@ -55,5 +55,29 @@ public void mouseClicked(MouseEvent e) {
 				Config.WINDOW_INIT_PADDING,
 				(int) (Config.WINDOW_INIT_WIDTH * 0.4),
 				Config.WINDOW_INIT_HEIGHT - Config.WINDOW_INIT_PADDING * 2);
+
+		ZoomButtonGroup zoomButtonGroup = new ZoomButtonGroup(context);
+
+		// Disable click-throughts to the overlapped map
+		zoomButtonGroup.addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				e.consume();
+			}
+		});
+
+		layers.add(zoomButtonGroup);
+		layers.setLayer(zoomButtonGroup, JLayeredPane.MODAL_LAYER + 1);
+		layers.addComponentListener(new ComponentAdapter() {
+			@Override
+			public void componentResized(ComponentEvent e) {
+				super.componentResized(e);
+				zoomButtonGroup.setBounds(
+						layers.getWidth() - 50 - 16,
+						layers.getHeight() - 100 - 16,
+						50,
+						100);
+			}
+		});
 	}
 }

src/main/java/edu/project/components/GeoMap.java

@@ -3,7 +3,7 @@
 import java.awt.Point;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
-import java.awt.event.MouseWheelListener;
+import java.awt.event.MouseWheelEvent;
 import java.io.IOException;
 import java.util.HashSet;
 
@@ -29,9 +29,34 @@ public GeoMap(Context context) {
 		addMouseListener(mouseInputListener);
 		addMouseMotionListener(mouseInputListener);
 
-		// Add Zoom Interaction
-		MouseWheelListener mouseWheelListener = new ZoomMouseWheelListenerCursor(this);
-		addMouseWheelListener(mouseWheelListener);
+		// Add Zoom Interaction with a zoom-out limiter
+		addMouseWheelListener(new ZoomMouseWheelListenerCursor(this) {
+			@Override
+			public void mouseWheelMoved(MouseWheelEvent evt) {
+				if (evt.getWheelRotation() > 0 && !canZoomOut())
+					return;
+				super.mouseWheelMoved(evt);
+			}
+		});
+
+		// Listen Zoom requests from store
+		context.store.addZoomInListener(() -> {
+			setZoom(getZoom() - 1);
+		});
+		context.store.addZoomOutListener(() -> {
+			if (!canZoomOut())
+				return;
+			setZoom(getZoom() + 1);
+		});
+
+		// Add Focus on click
+		addMouseListener(new MouseAdapter() {
+			@Override
+			public void mouseClicked(MouseEvent e) {
+				requestFocus();
+				super.mouseClicked(e);
+			}
+		});
 
 		WaypointPainter<DefaultWaypoint> waypointPainter = new WaypointPainter<>();
 		HashSet<DefaultWaypoint> waypoints = new HashSet<>();
@@ -66,4 +91,11 @@ public void mouseClicked(MouseEvent event) {
 		setCenterPosition(context.store.getLocation());
 		setZoom(Config.MAP_INIT_ZOOM);
 	}
+
+	private boolean canZoomOut() {
+		int zoom = getZoom();
+		int maxZoom = getTileFactory().getInfo().getMaximumZoomLevel();
+		int invertedZoom = maxZoom - zoom;
+		return (invertedZoom >= 4);
+	}
 }

src/main/java/edu/project/components/ZoomButtonGroup.java

@@ -0,0 +1,33 @@
+package edu.project.components;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.GridLayout;
+
+import javax.swing.JButton;
+import javax.swing.JPanel;
+
+import edu.project.Context;
+
+public class ZoomButtonGroup extends JPanel {
+	public ZoomButtonGroup(Context context) {
+		setOpaque(false);
+		setLayout(new GridLayout(2, 1));
+
+		JButton zoomInButton = new JButton("+");
+		zoomInButton.setFont(new Font("Arial", Font.PLAIN, 32));
+		zoomInButton.setForeground(Color.GRAY);
+		add(zoomInButton);
+		zoomInButton.addActionListener(e -> {
+			context.store.zoomIn();
+		});
+
+		JButton zoomOutButton = new JButton("-");
+		zoomOutButton.setForeground(Color.GRAY);
+		zoomOutButton.setFont(new Font("Arial", Font.PLAIN, 32));
+		add(zoomOutButton);
+		zoomOutButton.addActionListener(e -> {
+			context.store.zoomOut();
+		});
+	}
+}