我编写了一个程序,它使用了
javafx中的拖放功能.在
JavaFX8中它完美运行.
在JavaFX11中,拖放操作功能失效：我没有得到不同的鼠标光标,我没有得到我正在拖动的行的鬼图像,而且滴有问题 – 它们不会触发鼠标释放,然后每次我点击表格时触发掉落.
这是最小的可运行示例,它演示了我面临的问题.在Java 8 JVM上运行它可以根据需要运行.在Java 11 JVM上它没有.我在Ubuntu 18.04上.
我很好地改变我的代码以适应Java 11,但我不知道我做错了什么.
Java 11版
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版
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","GARCIA","RODRIGUEZ","WILSON","MARTINEZ","ANDERSON","TAYLOR","THOMAS","HERNANDEZ","MOORE","MARTIN","JACKSON"
};
}
解决方法
虽然JavaFX中的Drag and Drop具有适用于所有平台的通用API(当然,作为API的其余部分),但其内部实现依赖于平台,并且在Windows,Mac或Linux上完全不同.
但是,从JavaFX 8迁移到JavaFX 11时,这不应该是一个问题.
OP发布的示例在Windows和Mac上与JavaFX 8和11的工作方式相同,如果在Linux上不是这种情况,则可能与最新版本的JavaFX for Linux中所做的更改有关.
根据releases note,在重要变更部分,我们可以看到：
Switch default GTK version to 3
JavaFX will now use GTK 3 by default on Linux platforms where the gtk3 library is present. Prior to JavaFX 11,the GTK 2 library was the default. This matches the default for AWT in JDK 11. See JDK-8198654 for more information.
虽然这个change基本上是JavaFX代码中的两行差异,并且没有从DND的实现细节改变,但GTK 3实现可能已经从GTK 2改变了,并且这些改变没有被考虑在内.
据报道,dialogs,windows或Wayland crashes与GTK有关的类似问题.
解决方法
到目前为止,所有这些问题的唯一已知解决方法是使用GTK 2运行应用程序,可以使用系统属性设置：jdk.gtk.version.
因此可以在命令行上添加此选项：
java -Djdk.gtk.version=2 ...
运行应用程序.
正如评论中所述,这似乎解决了拖放问题.
报告问题
当然,这确认这是一个问题,因此它应该在OpenJFX问题tracker提交,提供重现它的示例代码,系统细节(操作系统版本,Java版本,JavaFX版本……).
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