Modify connection between MainWindow and the NotesInputPanel.

src/main/org/insa/graphics/DrawingChangeListener.java

@@ -0,0 +1,24 @@
+package org.insa.graphics;
+
+import org.insa.graphics.drawing.Drawing;
+
+public interface DrawingChangeListener {
+
+    /**
+     * Event fired when a new drawing is loaded.
+     * 
+     * @param oldDrawing Old drawing, may be null if no drawing exits prior to this
+     *        one.
+     * @param newDrawing New drawing.
+     */
+    public void onDrawingLoaded(Drawing oldDrawing, Drawing newDrawing);
+
+    /**
+     * Event fired when a redraw request is emitted - This is typically emitted
+     * after a onDrawingLoaded event, but not always, and request that elements are
+     * drawn again on the new drawing.
+     * 
+     */
+    public void onRedrawRequest();
+
+}

src/main/org/insa/graphics/GraphChangeListener.java

@@ -0,0 +1,14 @@
+package org.insa.graphics;
+
+import org.insa.graph.Graph;
+
+public interface GraphChangeListener {
+
+    /**
+     * Event fire when a new graph has been loaded.
+     * 
+     * @param graph The new graph.
+     */
+    public void newGraphLoaded(Graph graph);
+
+}

src/main/org/insa/graphics/MainWindow.java

@@ -21,6 +21,7 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.PrintStream;
 import java.util.ArrayList;
+import java.util.List;
 
 import javax.swing.BorderFactory;
 import javax.swing.Box;
@@ -131,6 +132,10 @@ public class MainWindow extends JFrame {
     // Factory
     private BlockingActionFactory baf;
 
+    // Observers
+    private List<DrawingChangeListener> drawingChangeListeners = new ArrayList<>();
+    private List<GraphChangeListener> graphChangeListeneres = new ArrayList<>();
+
     public MainWindow() {
         super(WINDOW_TITLE);
 
@@ -143,7 +148,7 @@ public class MainWindow extends JFrame {
 
         this.drawing = this.basicDrawing;
 
-        spPanel = new ShortestPathPanel(MainWindow.this);
+        spPanel = new ShortestPathPanel();
         spPanel.addStartActionListener(new ActionListener() {
             @Override
             public void actionPerformed(ActionEvent e) {
@@ -166,15 +171,19 @@ public class MainWindow extends JFrame {
         });
         spPanel.setVisible(false);
 
+        // Add click listeners to both drawing.
         basicDrawing.addDrawingClickListener(spPanel.nodesInputPanel);
         mapViewDrawing.addDrawingClickListener(spPanel.nodesInputPanel);
 
+        this.graphChangeListeneres.add(spPanel.nodesInputPanel);
+        this.drawingChangeListeners.add(spPanel.nodesInputPanel);
+
+        // Create action factory.
         this.currentThread = new ThreadWrapper(this);
         this.baf = new BlockingActionFactory(this);
         this.baf.addAction(currentThread);
 
         // Click adapter
-        addDrawingClickListeners();
         setJMenuBar(createMenuBar());
 
         addWindowListener(new WindowAdapter() {
@@ -229,6 +238,8 @@ public class MainWindow extends JFrame {
         // Top Panel
         this.add(createStatusBar(), BorderLayout.SOUTH);
 
+        // Notify everythin
+        notifyDrawingLoaded(null, drawing);
     }
 
     /**
@@ -369,7 +380,34 @@ public class MainWindow extends JFrame {
         });
     }
 
-    private void addDrawingClickListeners() {
+    /**
+     * Notify all listeners that a new graph has been loaded.
+     */
+    private void notifyNewGraphLoaded() {
+        for (GraphChangeListener listener: graphChangeListeneres) {
+            listener.newGraphLoaded(graph);
+        }
+    }
+
+    /**
+     * Notify all listeners that a new drawing has been set up.
+     * 
+     * @param oldDrawing
+     * @param newDrawing
+     */
+    private void notifyDrawingLoaded(Drawing oldDrawing, Drawing newDrawing) {
+        for (DrawingChangeListener listener: drawingChangeListeners) {
+            listener.onDrawingLoaded(oldDrawing, newDrawing);
+        }
+    }
+
+    /**
+     * Notify all listeners that a redraw request is emitted.
+     */
+    private void notifyRedrawRequest() {
+        for (DrawingChangeListener listener: drawingChangeListeners) {
+            listener.onRedrawRequest();
+        }
     }
 
     /**
@@ -414,22 +452,26 @@ public class MainWindow extends JFrame {
                 drawing = mapViewDrawing;
                 mainPanel.setLeftComponent(mapViewDrawing);
                 mainPanel.setDividerLocation(oldLocation);
+                notifyDrawingLoaded(basicDrawing, mapViewDrawing);
             }
 
             // 2. We draw the graph.
             drawing.clear();
             ((MapViewDrawing) drawing).drawGraph(mfile);
+            notifyRedrawRequest();
+
         }
         else if (!isMapView || (isMapView && mfile == null && isNewGraph)) {
             if (drawing == mapViewDrawing) {
                 mapViewDrawing.clear();
                 drawing = basicDrawing;
-                addDrawingClickListeners();
                 mainPanel.setLeftComponent(basicDrawing);
                 mainPanel.setDividerLocation(oldLocation);
+                notifyDrawingLoaded(mapViewDrawing, basicDrawing);
             }
             drawing.clear();
             drawing.drawGraph(graph, palette);
+            notifyRedrawRequest();
         }
 
     }
@@ -485,6 +527,7 @@ public class MainWindow extends JFrame {
                                 exception.printStackTrace(System.out);
                                 return;
                             }
+                            notifyNewGraphLoaded();
 
                             // Save file path.
                             graphFilePath = path;

src/main/org/insa/graphics/NodesInputPanel.java

@@ -21,12 +21,15 @@ import javax.swing.JTextField;
 import javax.swing.event.DocumentEvent;
 import javax.swing.event.DocumentListener;
 
+import org.insa.graph.Graph;
 import org.insa.graph.Node;
 import org.insa.graph.Point;
+import org.insa.graphics.drawing.Drawing;
 import org.insa.graphics.drawing.DrawingClickListener;
 import org.insa.graphics.drawing.overlays.MarkerOverlay;
 
-public class NodesInputPanel extends JPanel implements DrawingClickListener {
+public class NodesInputPanel extends JPanel
+        implements DrawingClickListener, DrawingChangeListener, GraphChangeListener {
 
     /**
      * 
@@ -61,8 +64,8 @@ public class NodesInputPanel extends JPanel implements DrawingClickListener {
     };
 
     // Node inputs and markers.
-    private ArrayList<JTextField> nodeInputs = new ArrayList<>();
-    private Map<JTextField, MarkerOverlay> markerTrackers = new IdentityHashMap<JTextField, MarkerOverlay>();
+    private final ArrayList<JTextField> nodeInputs = new ArrayList<>();
+    private final Map<JTextField, MarkerOverlay> markerTrackers = new IdentityHashMap<JTextField, MarkerOverlay>();
 
     // Component that can be enabled/disabled.
     private ArrayList<JComponent> components = new ArrayList<>();
@@ -71,12 +74,16 @@ public class NodesInputPanel extends JPanel implements DrawingClickListener {
     // ActionListener called when all inputs are filled.
     private ArrayList<ActionListener> inputChangeListeners = new ArrayList<>();
 
-    // Instance of mainwindow.
-    MainWindow mainWindow;
+    // Drawing and graph
+    private Drawing drawing;
+    private Graph graph;
 
-    public NodesInputPanel(MainWindow mainWindow) {
+    /**
+     * @param drawing Original drawing used (see {@link:newDrawingLoaded}).
+     * @param graph Original graph used (see {@link:newGraphLoaded});
+     */
+    public NodesInputPanel() {
         super(new GridBagLayout());
-        this.mainWindow = mainWindow;
         initInputToFill();
     }
 
@@ -105,6 +112,7 @@ public class NodesInputPanel extends JPanel implements DrawingClickListener {
     public void clear() {
         for (JTextField field: nodeInputs) {
             field.setText("");
+            markerTrackers.put(field, null);
         }
         initInputToFill();
     }
@@ -174,7 +182,7 @@ public class NodesInputPanel extends JPanel implements DrawingClickListener {
                 MarkerOverlay tracker = markerTrackers.getOrDefault(textField, null);
                 if (curnode != null) {
                     if (tracker == null) {
-                        tracker = mainWindow.drawing.drawMarker(curnode.getPoint(), markerColor);
+                        tracker = drawing.drawMarker(curnode.getPoint(), markerColor);
                         markerTrackers.put(textField, tracker);
                     }
                     else {
@@ -223,7 +231,7 @@ public class NodesInputPanel extends JPanel implements DrawingClickListener {
      */
     protected Node getNodeForInput(JTextField textfield) {
         try {
-            Node node = this.mainWindow.graph.getNodes().get(Integer.valueOf(textfield.getText().trim()));
+            Node node = graph.getNodes().get(Integer.valueOf(textfield.getText().trim()));
             return node;
         }
         catch (IllegalArgumentException | IndexOutOfBoundsException ex) {
@@ -292,11 +300,38 @@ public class NodesInputPanel extends JPanel implements DrawingClickListener {
 
     @Override
     public void mouseClicked(Point point) {
-        Node node = this.mainWindow.graph.findClosestNode(point);
+        Node node = graph.findClosestNode(point);
         JTextField input = getInputToFill();
         if (input != null) {
             input.setText(String.valueOf(node.getId()));
             nextInputToFill();
         }
     }
+
+    @Override
+    public void newGraphLoaded(Graph graph) {
+        if (graph != this.graph) {
+            this.clear();
+            this.graph = graph;
+        }
+    }
+
+    @Override
+    public void onDrawingLoaded(Drawing oldDrawing, Drawing newDrawing) {
+        if (newDrawing != drawing) {
+            this.drawing = newDrawing;
+
+        }
+    }
+
+    @Override
+    public void onRedrawRequest() {
+        for (JTextField input: nodeInputs) {
+            MarkerOverlay tracker = markerTrackers.getOrDefault(input, null);
+            if (tracker != null) {
+                markerTrackers.put(input, this.drawing.drawMarker(tracker.getPoint(), tracker.getColor()));
+                tracker.delete();
+            }
+        }
+    }
 }

src/main/org/insa/graphics/ShortestPathPanel.java

@@ -95,7 +95,9 @@ public class ShortestPathPanel extends JPanel {
     // Start listeners
     List<ActionListener> startActionListeners = new ArrayList<>();
 
-    public ShortestPathPanel(MainWindow mainWindow) {
+    /**
+     */
+    public ShortestPathPanel() {
         super();
         setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
 
@@ -122,7 +124,7 @@ public class ShortestPathPanel extends JPanel {
         components.add(algoSelect);
 
         // Add inputs for node.
-        this.nodesInputPanel = new NodesInputPanel(mainWindow);
+        this.nodesInputPanel = new NodesInputPanel();
         this.nodesInputPanel.setAlignmentX(Component.LEFT_ALIGNMENT);
         nodesInputPanel.addTextField("Origin: ", new Color(57, 172, 115));
         nodesInputPanel.addTextField("Destination: ", new Color(255, 77, 77));

src/main/org/insa/graphics/drawing/BasicDrawing.java

@@ -99,6 +99,11 @@ public class BasicDrawing extends JPanel implements Drawing {
             return point;
         }
 
+        @Override
+        public Color getColor() {
+            return color;
+        }
+
         @Override
         public void moveTo(Point point) {
             this.point = point;
@@ -440,7 +445,7 @@ public class BasicDrawing extends JPanel implements Drawing {
 
     @Override
     public void drawGraph(Graph graph, GraphPalette palette) {
-        clear();
+        this.clear();
         initialize(graph);
         for (Node node: graph.getNodes()) {
             for (Arc arc: node.getSuccessors()) {

src/main/org/insa/graphics/drawing/MapViewDrawing.java

@@ -80,8 +80,12 @@ public class MapViewDrawing extends MapView implements Drawing {
 
     private class MapViewMarkerOverlay extends MapViewOverlay implements MarkerOverlay {
 
-        public MapViewMarkerOverlay(Marker marker) {
+        // Color of this marker
+        Color color;
+
+        public MapViewMarkerOverlay(Marker marker, Color color) {
             super(new Layer[] { marker });
+            this.color = color;
         }
 
         @Override
@@ -90,6 +94,11 @@ public class MapViewDrawing extends MapView implements Drawing {
             return new Point(marker.getLatLong().getLongitude(), marker.getLatLong().getLatitude());
         }
 
+        @Override
+        public Color getColor() {
+            return color;
+        }
+
         @Override
         public void moveTo(Point point) {
             Marker marker = (Marker) this.layers[0];
@@ -187,7 +196,7 @@ public class MapViewDrawing extends MapView implements Drawing {
 
     @Override
     public MarkerOverlay drawMarker(Point point, Color color) {
-        return new MapViewMarkerOverlay(createMarker(point, color));
+        return new MapViewMarkerOverlay(createMarker(point, color), color);
     }
 
     @Override

src/main/org/insa/graphics/drawing/overlays/MarkerOverlay.java

@@ -1,9 +1,16 @@
 package org.insa.graphics.drawing.overlays;
 
+import java.awt.Color;
+
 import org.insa.graph.Point;
 
 public interface MarkerOverlay extends Overlay {
 
+    /**
+     * @return Color associated with this marker.
+     */
+    public Color getColor();
+
     /**
      * @return The point associated with this marker.
      */