1 files changed, 164 insertions, 0 deletions
diff --git a/src/jcgp/gui/handlers/NodeHandlers.java b/src/jcgp/gui/handlers/NodeHandlers.java
new file mode 100644
index 0000000..b413a62
--- /dev/null
+++ b/src/jcgp/gui/handlers/NodeHandlers.java
@@ -0,0 +1,164 @@
+package jcgp.gui.handlers;
+
+import javafx.event.EventHandler;
+import javafx.scene.input.MouseDragEvent;
+import javafx.scene.input.MouseEvent;
+import javafx.scene.shape.Circle;
+import javafx.scene.shape.Line;
+import jcgp.backend.population.Gene;
+import jcgp.gui.GUI;
+import jcgp.gui.constants.Position;
+import jcgp.gui.population.ChromosomePane;
+import jcgp.gui.population.GUIConnection;
+import jcgp.gui.population.GUIGene;
+import jcgp.gui.population.GUIGene.GUIGeneState;
+import jcgp.gui.population.GUINode;
+
+/**
+ * Holds the handlers that define the behaviour of {@code GUINode}.
+ * <br><br>
+ * The handlers are instantiated here statically and added to {@code GUINode}
+ * instances using {@code NodeHandlers.addHandlers(...)}. This guarantees that
+ * all nodes behave the same way without instantiating a new set of handlers for
+ * each node instance.
+ * 
+ * @author Eduardo Pedroni
+ *
+ */
+public final class NodeHandlers {
+
+	/**
+	 * Private constructor to prevent instantiation.
+	 */
+	private NodeHandlers() {}
+
+	/**
+	 * Set the node to {@code GUIGeneState.HOVER} state, and set its immediate connections to {@code GUIGeneState.EXTENDED_HOVER}.
+	 */
+	private static EventHandler<MouseEvent> mouseEnteredHandler = new EventHandler<MouseEvent>() {
+		@Override
+		public void handle(MouseEvent event) {
+			// acquire the source, we can safely cast it to GUINode
+			GUINode source = (GUINode) event.getSource();
+
+			source.setState(GUIGeneState.HOVER);
+			for (int i = 0; i < GUI.resources.arity(); i++) {
+				((GUIGene) ((Gene) source.getNode().getConnection(i)).getGUIObject()).setState(GUIGeneState.EXTENDED_HOVER);
+			}
+		}
+	};
+
+	/**
+	 * Set the node and its immediate connections to {@code GUIGeneState.NEUTRAL} state.
+	 */
+	private static EventHandler<MouseEvent> mouseExitedHandler = new EventHandler<MouseEvent>() {
+		@Override
+		public void handle(MouseEvent event) {
+			// acquire the source, we can safely cast it to GUINode
+			GUINode source = (GUINode) event.getSource();
+
+			if (Target.getSourceMutable() != source) {
+				source.setState(GUIGeneState.NEUTRAL);
+				for (int i = 0; i < GUI.resources.arity(); i++) {
+					((GUIGene) ((Gene) source.getNode().getConnection(i)).getGUIObject()).setState(GUIGeneState.NEUTRAL);
+				}
+			}
+		}
+	};
+
+	private static EventHandler<MouseEvent> socketDragDetected = new EventHandler<MouseEvent>() {
+		@Override
+		public void handle(MouseEvent event) {
+			// it's safe to assume that the source is the socket
+			((GUINode) ((Circle) event.getSource()).getParent()).startFullDrag();
+		}
+	};
+
+	private static EventHandler<MouseEvent> socketMousePressedHandler = new EventHandler<MouseEvent>() {
+		@Override
+		public void handle(MouseEvent event) {
+			// it's safe to assume that the source is the socket
+			Target.start((Circle) event.getSource());
+		}
+	};
+
+	private static EventHandler<MouseEvent> socketMouseDraggedHandler = new EventHandler<MouseEvent>() {
+		@Override
+		public void handle(MouseEvent event) {
+			// this can only happen after a press, so we know Target is up-to-date
+			if (!Target.isProspecting()) {
+				GUINode node = (GUINode) Target.getSourceMutable();
+				Line line = Target.getConnectionLine();
+				line.setEndX(event.getX() + node.getLayoutX());
+				line.setEndY(event.getY() + node.getLayoutY());
+			}
+
+		}
+	};
+
+	private static EventHandler<MouseEvent> socketMouseReleasedHandler = new EventHandler<MouseEvent>() {
+		@Override
+		public void handle(MouseEvent event) {
+
+			GUINode node = (GUINode) ((Circle) event.getSource()).getParent();
+			int connectionId = Integer.valueOf(((Circle) event.getSource()).getId());
+
+			Position.connect(node.getLines()[connectionId], (GUIGene) ((Gene) node.getNode().getConnection(connectionId)).getGUIObject());
+		}
+	};
+
+	private static EventHandler<MouseDragEvent> dragEnteredHandler = new EventHandler<MouseDragEvent>() {
+		@Override
+		public void handle(MouseDragEvent event) {
+			// acquire the source, we can safely cast it to GUINode
+			GUINode source = (GUINode) event.getSource();
+			if (Target.getCurrentConnection() == source) {
+				source.setState(GUIGeneState.NEUTRAL_TARGET);
+				// we are now prospecting
+				Target.setProspecting(true);
+				Position.connect(Target.getConnectionLine(), source);
+			} else if (ChromosomePane.isAllowed(Target.getSourceMutable(), (GUIConnection) source)) {
+				source.setState(GUIGeneState.GOOD_TARGET);
+				// we are now prospecting
+				Target.setProspecting(true);
+				Position.connect(Target.getConnectionLine(), source);
+			} else {
+				source.setState(GUIGeneState.BAD_TARGET);
+			}
+		}
+	};
+
+	private static EventHandler<MouseDragEvent> dragExitedHandler = new EventHandler<MouseDragEvent>() {
+		@Override
+		public void handle(MouseDragEvent event) {
+			// acquire the source, we can safely cast it to GUINode
+			GUINode source = (GUINode) event.getSource();
+			source.setState(GUIGeneState.NEUTRAL);
+			
+			// no longer prospecting
+			Target.setProspecting(false);
+		}
+	};
+
+	/**
+	 * Adds all handlers to the specified node.
+	 * 
+	 * @param node the {@code GUINode} to which the handlers will be added.
+	 */
+	public static void addHandlers(GUINode node) {
+		node.addEventHandler(MouseEvent.MOUSE_ENTERED, mouseEnteredHandler);
+		node.addEventHandler(MouseEvent.MOUSE_EXITED, mouseExitedHandler);
+
+		node.addEventHandler(MouseDragEvent.MOUSE_DRAG_ENTERED, dragEnteredHandler);
+		node.addEventHandler(MouseDragEvent.MOUSE_DRAG_EXITED, dragExitedHandler);
+
+		Circle[] sockets = node.getSockets();
+		for (int s = 0; s < sockets.length; s++) {
+
+			sockets[s].addEventFilter(MouseEvent.DRAG_DETECTED, socketDragDetected);
+			sockets[s].addEventHandler(MouseEvent.MOUSE_PRESSED, socketMousePressedHandler);
+			sockets[s].addEventHandler(MouseEvent.MOUSE_DRAGGED, socketMouseDraggedHandler);
+			sockets[s].addEventHandler(MouseEvent.MOUSE_RELEASED, socketMouseReleasedHandler);
+		}
+	}
+}