I wrote a program which makes use of drag and drop in javafx. In JavaFX8 it works perfectly.
In JavaFX11, the drag and drop is dysfunctional: I don't get a different mouse cursor, I don't get a ghost image of the row I'm dragging, and something's wrong with the drops -- they don't trigger on mouse release, and then the drop is triggered each time I click on the table.
Here is minimum runnable example which demonstrates the issue I'm facing. Run on a Java 8 JVM it works as desired. On Java 11 JVM it does not. I am on Ubuntu 18.04.
I'm fine with changing my code to accommodate Java 11, but I don't have any idea what I'm doing wrong.
Java 11 Version
java version "11.0.1" 2018-10-16 LTS
Java(TM) SE Runtime Environment 18.9 (build 11.0.1+13-LTS)
Java HotSpot(TM) 64-Bit Server VM 18.9 (build 11.0.1+13-LTS, mixed mode)
Java 8 Version
openjdk version "1.8.0_181"
OpenJDK Runtime Environment (build 1.8.0_181-8u181-b13-1ubuntu0.18.04.1-b13)
OpenJDK 64-Bit Server VM (build 25.181-b13, mixed mode)
DND11.java
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.scene.Scene;
import javafx.scene.control.SelectionMode;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.DataFormat;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import javafx.stage.Stage;
public class DND11 extends Application {
public TableView<Person> getTable () {
DataFormat DRAGGED_PERSON = new DataFormat ( "application/example-person" );
TableColumn <Person, String> firstNameColumn = new TableColumn <> ( "First Name" );
TableColumn <Person, String> LastNameColumn = new TableColumn <> ( "Last Name" );
firstNameColumn.setCellValueFactory( new PropertyValueFactory <Person, String>( "firstName" ) );
LastNameColumn.setCellValueFactory( new PropertyValueFactory <Person, String>( "lastName" ) );
TableView <Person> tableView = new TableView <> ();
tableView.getColumns().addAll( firstNameColumn, LastNameColumn );
tableView.setColumnResizePolicy( TableView.CONSTRAINED_RESIZE_POLICY );
tableView.setEditable( false );
tableView.setItems( FXCollections.observableArrayList( Person.generatePersons ( 10 ) ) );
tableView.getSelectionModel().setSelectionMode( SelectionMode.MULTIPLE );
tableView.setRowFactory( tv -> {
TableRow <Person> row = new TableRow <>();
row.setOnDragDetected( event -> {
if ( !row.isEmpty() ) {
Dragboard db = row.startDragAndDrop( TransferMode.COPY );
ClipboardContent cc = new ClipboardContent();
cc.put( DRAGGED_PERSON, row.getItem() );
tableView.getItems().remove( row.getItem() );
db.setContent( cc );
}
});
row.setOnDragOver( event -> {
Dragboard db = event.getDragboard();
event.acceptTransferModes( TransferMode.COPY );
});
row.setOnDragDropped( event -> {
Dragboard db = event.getDragboard();
Person person = (Person)event.getDragboard().getContent( DRAGGED_PERSON );
if ( person != null ) {
tableView.getItems().remove( person );
int dropIndex = row.getIndex();
tableView.getItems().add( dropIndex, person );
}
event.setDropCompleted( true );
event.consume();
});
return row;
});
return tableView;
}
@Override
public void start ( Stage stage ) throws Exception {
stage.setScene( new Scene( getTable(), 800, 400 ) );
stage.show();
}
public static void main ( String[] args ) {
launch( args );
}
}
Person.java
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
public class Person implements Serializable {
private static final long serialVersionUID = 1L;
private String firstName, lastName;
public Person ( String firstName, String lastName ) {
this.firstName = firstName;
this.lastName = lastName;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public static List <Person> generatePersons ( int number ) {
List<Person> retMe = new ArrayList<Person> ( number );
for ( int k = 0; k < number; k++ ) {
retMe.add ( new Person ( randomFirstName(), randomLastName() ) );
}
return retMe;
}
private static Random rand = new Random();
private static String randomFirstName() {
return firstNames [ Math.abs( rand.nextInt() ) % firstNames.length ];
}
private static String randomLastName() {
return lastNames [ Math.abs( rand.nextInt() ) % lastNames.length ];
}
private static String[] firstNames = new String[] {
"ANTON","ANTONE","ANTONIA","NTONIO","ANTONY","ANTWAN","ARCHIE","ARDEN","ARIEL","ARLEN",
"ARMAND","ARMANDO","ARNOLD","ARNOLDO","ARNULF","ARON","ARRON","ART","ARTHUR","ARTURO",
"DARRICK","DARRIN","DARRON","DARRYL","DARWIN","DARYL","DAVE","DAVID","DAVIS","DEAN",
};
private static String[] lastNames = new String[] {
"SMITH","JOHNSON","WILLIAMS","BROWN","JONES","MILLER","DAVIS","GARCIA","RODRIGUEZ",
"WILSON","MARTINEZ","ANDERSON","TAYLOR","THOMAS","HERNANDEZ","MOORE","MARTIN","JACKSON"
};
}
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