- Nodes
- Scenes
The gesture source and gesture target can belong to a single JavaFX application or to two different JavaFX or Java Client applications. Moreover, drag-and-drop can be implemented between a JavaFX application and a third-party (native) application such as Windows Explorer or a desktop.
Example:
In this example, we create four Text object. All of them are set as both drag-and-drop source and target.
package javafx_draganddrop;
import javafx.application.Application;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.input.*;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.stage.Stage;
/**
*
* @web http://java-buddy.blogspot.com/
*/
public class JavaFX_DragAndDrop extends Application {
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle("java-buddy.blogspot.com");
Group root = new Group();
Scene scene = new Scene(root, 350, 300);
final Text text1 = new Text(50, 100, "TEXT 1");
text1.setScaleX(2.0);
text1.setScaleY(2.0);
final Text text2 = new Text(250, 100, "TEXT 2");
text2.setScaleX(2.0);
text2.setScaleY(2.0);
final Text text3 = new Text(50, 200, "TEXT 3");
text3.setScaleX(2.0);
text3.setScaleY(2.0);
final Text text4 = new Text(250, 200, "TEXT 4");
text4.setScaleX(2.0);
text4.setScaleY(2.0);
setupGestureSource(text1);
setupGestureTarget(text1);
setupGestureSource(text2);
setupGestureTarget(text2);
setupGestureSource(text3);
setupGestureTarget(text3);
setupGestureSource(text4);
setupGestureTarget(text4);
root.getChildren().addAll(text1, text2, text3, text4);
primaryStage.setScene(scene);
primaryStage.show();
primaryStage.show();
}
void setupGestureSource(final Text source){
source.setOnDragDetected(new EventHandler <MouseEvent>() {
@Override
public void handle(MouseEvent event) {
/* drag was detected, start drag-and-drop gesture*/
System.out.println("onDragDetected");
/* allow any transfer mode */
Dragboard db = source.startDragAndDrop(TransferMode.ANY);
/* put a string on dragboard */
ClipboardContent content = new ClipboardContent();
content.putString(source.getText());
db.setContent(content);
event.consume();
}
});
source.setOnDragDone(new EventHandler <DragEvent>() {
@Override
public void handle(DragEvent event) {
/* the drag-and-drop gesture ended */
System.out.println("onDragDone");
/* if the data was successfully moved, clear it */
if (event.getTransferMode() == TransferMode.MOVE) {
source.setText("");
}
event.consume();
}
});
}
void setupGestureTarget(final Text target){
target.setOnDragOver(new EventHandler <DragEvent>() {
@Override
public void handle(DragEvent event) {
/* data is dragged over the target */
System.out.println("onDragOver");
/* accept it only if it is not dragged from the same node
* and if it has a string data */
if (event.getGestureSource() != target &&
event.getDragboard().hasString()) {
/* allow for both copying and moving, whatever user chooses */
event.acceptTransferModes(TransferMode.COPY_OR_MOVE);
}
event.consume();
}
});
target.setOnDragEntered(new EventHandler <DragEvent>() {
@Override
public void handle(DragEvent event) {
/* the drag-and-drop gesture entered the target */
System.out.println("onDragEntered");
/* show to the user that it is an actual gesture target */
if (event.getGestureSource() != target &&
event.getDragboard().hasString()) {
target.setFill(Color.GREEN);
}
event.consume();
}
});
target.setOnDragExited(new EventHandler <DragEvent>() {
@Override
public void handle(DragEvent event) {
/* mouse moved away, remove the graphical cues */
target.setFill(Color.BLACK);
event.consume();
}
});
target.setOnDragDropped(new EventHandler <DragEvent>() {
@Override
public void handle(DragEvent event) {
/* data dropped */
System.out.println("onDragDropped");
/* if there is a string data on dragboard, read it and use it */
Dragboard db = event.getDragboard();
boolean success = false;
if (db.hasString()) {
target.setText(target.getText() + "\n" + db.getString());
success = true;
}
/* let the source know whether the string was successfully
* transferred and used */
event.setDropCompleted(success);
event.consume();
}
});
}
}
Reference: http://docs.oracle.com/javafx/2.0/drag_drop/jfxpub-drag_drop.htm
More demonstration of JavaFX 2.0 drag-and-drop:
Between two copy of the same JavaFX 2.0 application.
Between JavaFX 2.0 application and Google Chrome.
Related article:
- JavaFX 2.0: Implement GestureTarget of Drag and Drop for Image