Drag, drop AND MouseEvents
I am trying to build a mapping application and data running on the issues of the event presented with DND. I would like to draw a line "stretching" between "ports". When the target port, I would like to drop some info on it. The commented code below (with the _port.setOnDragDetected method) is the stretch described (ports are expanded to the demonstration). If this block of code is uncommented, the drop works as I need to, but events are delivered to the linework. Problem is that I need two.public class DataXferView extends Application {
private Line connection;
private Group root;
private HashMap<String, Color> colorMap;
private void init(Stage primaryStage) {
colorMap = new HashMap<String, Color>();
colorMap.put("1", Color.LIGHTBLUE);
colorMap.put("2", Color.ORANGE);
root = new Group();
primaryStage.setScene(new Scene(root, 400, 300));
Group outPort1 = createOutPort(50.0, 50.0, "1");
Group outPort2 = createOutPort(50.0, 125.0, "2");
Group inPort = createInPort(250.0, 75.0);
root.getChildren().add(inPort);
root.getChildren().add(outPort1);
root.getChildren().add(outPort2);
}
private Group createOutPort(double _topLeftX, double _topLeftY, String _portId) {
Group outPortBox = new Group();
Rectangle borderBox = RectangleBuilder.create().x(_topLeftX).y(_topLeftY)
.width(100).height(40).fill(Color.WHITE).stroke(Color.BLACK).build();
Circle port = CircleBuilder.create().centerX(_topLeftX + 80)
.centerY(_topLeftY + 20).radius(10.0f)
.fill(colorMap.get(_portId)).stroke(Color.DARKGREY).build();
port.setUserData(_portId);
setOutPortEvents(port);
outPortBox.getChildren().addAll(borderBox, port);
return outPortBox;
}
private void setOutPortEvents(final Circle _port) {
_port.setOnMousePressed(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent me) {
connection = LineBuilder.create().stroke(_port.getFill()).strokeWidth(2.0)
.startX(_port.getCenterX()).startY(_port.getCenterY())
.endX(_port.getCenterX()).endY(_port.getCenterY()).build();
root.getChildren().add(connection);
}
});
_port.setOnMouseDragged(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent me) {
connection.setEndX(me.getSceneX());
connection.setEndY(me.getSceneY());
}
});
// _port.setOnDragDetected(new EventHandler<MouseEvent>() {
//
// @Override
// public void handle(MouseEvent me) {
// Dragboard db = _port.startDragAndDrop(TransferMode.ANY);
// // Put a string on a dragboard
// ClipboardContent content = new ClipboardContent();
// content.putString((String)_port.getUserData());
// db.setContent(content);
// }
// });
}
private Group createInPort(double _topLeftX, double _topLeftY) {
Group inPortBox = new Group();
Rectangle borderBox = RectangleBuilder.create().x(_topLeftX).y(_topLeftY)
.width(100).height(40).fill(Color.WHITE).stroke(Color.BLACK).build();
Circle port = CircleBuilder.create().centerX(_topLeftX + 20).centerY(_topLeftY + 20)
.radius(10.0f).fill(Color.WHITE).stroke(Color.DARKGREY).build();
setInPortEvents(port);
inPortBox.getChildren().addAll(borderBox, port);
return inPortBox;
}
private void setInPortEvents(final Circle _port) {
_port.setOnDragOver(new EventHandler<DragEvent>() {
@Override
public void handle(DragEvent event) {
if (event.getGestureSource() != _port
&& event.getDragboard().hasString()) {
event.acceptTransferModes(TransferMode.ANY);
}
event.consume();
}
});
_port.setOnDragEntered(new EventHandler<DragEvent>() {
@Override
public void handle(DragEvent event) {
if (event.getGestureSource() != _port
&& event.getDragboard().hasString()) {
_port.setStroke(Color.RED);
}
event.consume();
}
});
_port.setOnDragExited(new EventHandler<DragEvent>() {
@Override
public void handle(DragEvent event) {
_port.setStroke(Color.DARKGREY);
event.consume();
}
});
_port.setOnDragDropped(new EventHandler<DragEvent>() {
@Override
public void handle(DragEvent event) {
Dragboard db = event.getDragboard();
boolean success = false;
if (db.hasString()) {
_port.setFill(colorMap.get(db.getString()));
success = true;
}
event.setDropCompleted(success);
event.consume();
}
});
}
@Override
public void start(Stage primaryStage) throws Exception {
init(primaryStage);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}And the solution will be included in the final version of 2.1 (I am current using 2.1 b07)?
Workaround advice are appreciated. Thank you.
The attached code contains the following changes:
-the block of initialization of the DND is no comment
-the MouseDragged Manager is removed, instead, the DragOver filter is added to the stage
-the line is marked mouseTransparent, otherwise he keeps eating the DragOver events that we want to be delivered to the port target
He deserves a little more work, for example, it allows a transfer of data between applications, but not for the lines between applications, but the basic idea should be clear.
public class DataXferView extends Application {
private Line connection;
private Group root;
private HashMap colorMap;
private void init(Stage primaryStage) {
colorMap = new HashMap();
colorMap.put("1", Color.LIGHTBLUE);
colorMap.put("2", Color.ORANGE);
root = new Group();
Scene scene = new Scene(root, 400, 300);
primaryStage.setScene(scene);
scene.addEventFilter(DragEvent.DRAG_OVER, new EventHandler() {
@Override
public void handle(DragEvent me) {
if (me.getGestureSource() != null) {
connection.setEndX(me.getSceneX());
connection.setEndY(me.getSceneY());
}
}
});
Group outPort1 = createOutPort(50.0, 50.0, "1");
Group outPort2 = createOutPort(50.0, 125.0, "2");
Group inPort = createInPort(250.0, 75.0);
root.getChildren().add(inPort);
root.getChildren().add(outPort1);
root.getChildren().add(outPort2);
}
private Group createOutPort(double _topLeftX, double _topLeftY, String _portId) {
Group outPortBox = new Group();
Rectangle borderBox = RectangleBuilder.create().x(_topLeftX).y(_topLeftY)
.width(100).height(40).fill(Color.WHITE).stroke(Color.BLACK).build();
Circle port = CircleBuilder.create().centerX(_topLeftX + 80)
.centerY(_topLeftY + 20).radius(10.0f)
.fill(colorMap.get(_portId)).stroke(Color.DARKGREY).build();
port.setUserData(_portId);
setOutPortEvents(port);
outPortBox.getChildren().addAll(borderBox, port);
return outPortBox;
}
private void setOutPortEvents(final Circle _port) {
_port.setOnMousePressed(new EventHandler() {
@Override
public void handle(MouseEvent me) {
connection = LineBuilder.create().stroke(_port.getFill()).strokeWidth(2.0)
.startX(_port.getCenterX()).startY(_port.getCenterY())
.endX(_port.getCenterX()).endY(_port.getCenterY()).build();
connection.setMouseTransparent(true);
root.getChildren().add(connection);
}
});
_port.setOnDragDetected(new EventHandler() {
@Override
public void handle(MouseEvent me) {
Dragboard db = _port.startDragAndDrop(TransferMode.ANY);
// Put a string on a dragboard
ClipboardContent content = new ClipboardContent();
content.putString((String)_port.getUserData());
db.setContent(content);
}
});
}
private Group createInPort(double _topLeftX, double _topLeftY) {
Group inPortBox = new Group();
Rectangle borderBox = RectangleBuilder.create().x(_topLeftX).y(_topLeftY)
.width(100).height(40).fill(Color.WHITE).stroke(Color.BLACK).build();
Circle port = CircleBuilder.create().centerX(_topLeftX + 20).centerY(_topLeftY + 20)
.radius(10.0f).fill(Color.WHITE).stroke(Color.DARKGREY).build();
setInPortEvents(port);
inPortBox.getChildren().addAll(borderBox, port);
return inPortBox;
}
private void setInPortEvents(final Circle _port) {
_port.setOnDragOver(new EventHandler() {
@Override
public void handle(DragEvent event) {
if (event.getGestureSource() != _port
&& event.getDragboard().hasString()) {
event.acceptTransferModes(TransferMode.ANY);
}
event.consume();
}
});
_port.setOnDragEntered(new EventHandler() {
@Override
public void handle(DragEvent event) {
if (event.getGestureSource() != _port
&& event.getDragboard().hasString()) {
_port.setStroke(Color.RED);
}
event.consume();
}
});
_port.setOnDragExited(new EventHandler() {
@Override
public void handle(DragEvent event) {
_port.setStroke(Color.DARKGREY);
event.consume();
}
});
_port.setOnDragDropped(new EventHandler() {
@Override
public void handle(DragEvent event) {
Dragboard db = event.getDragboard();
boolean success = false;
if (db.hasString()) {
_port.setFill(colorMap.get(db.getString()));
success = true;
}
event.setDropCompleted(success);
event.consume();
}
});
}
@Override
public void start(Stage primaryStage) throws Exception {
init(primaryStage);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
Tags: Java
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