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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);
}
}
}
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