如果您的拖动对象不可序列化,请在拖动期间将其保存在全局变量中。这是一个 JavaFx(带有 lambdas 的 Java8)示例,其中可拖动选项卡位于同一 JVM 中的多个窗格之间。
import java.util.Random;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.input.ClipboardContent;
import javafx.scene.input.DataFormat;
import javafx.scene.input.Dragboard;
import javafx.scene.input.TransferMode;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class DraggingTabPane extends Application {
private static final DataFormat TAB_TYPE = new DataFormat("nonserializableObject/tab");
private static Tab dndTab;// global for drag-n-drop of non-serializable type
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
TabPane tabPane1 = createDndTabPane();
TabPane tabPane2 = createDndTabPane();
VBox root = new VBox(10);
root.getChildren().addAll(tabPane1, tabPane2);
final Random rng = new Random();
for (int i=1; i<=8; i++) {
final Tab tab = createDraggableTab("Tab "+i);
final StackPane pane = new StackPane();
int red = rng.nextInt(256);
int green = rng.nextInt(256);
int blue = rng.nextInt(256);
String style = String.format("-fx-background-color: rgb(%d, %d, %d);", red, green, blue);
pane.setStyle(style);
final Label label = new Label("This is tab "+i);
label.setStyle(String.format("-fx-text-fill: rgb(%d, %d, %d);", 256-red, 256-green, 256-blue));
pane.getChildren().add(label);
pane.setMinWidth(600);
pane.setMinHeight(250);
tab.setContent(pane);
if (i<=4) {
tabPane1.getTabs().add(tab);
} else {
tabPane2.getTabs().add(tab);
}
}
primaryStage.setScene(new Scene(root, 600, 600));
primaryStage.show();
}
public TabPane createDndTabPane() {
final TabPane tabPane = new TabPane();
tabPane.setOnDragOver(event -> {
if (event.getDragboard().hasContent(TAB_TYPE)
&& dndTab.getTabPane() != tabPane) {// && different from source location
event.acceptTransferModes(TransferMode.MOVE);
event.consume();
}
});
tabPane.setOnDragDropped(event -> {
if (event.getDragboard().hasContent(TAB_TYPE)
&& dndTab.getTabPane() != tabPane) {// && different from source location
dndTab.getTabPane().getTabs().remove(dndTab);
tabPane.getTabs().add(dndTab);
event.setDropCompleted(true);
event.consume();
}
});
return tabPane;
}
private Tab createDraggableTab(String text) {
final Tab tab = new Tab();
final Label label = new Label(text);
tab.setGraphic(label);
label.setOnDragDetected(event -> {
Dragboard dragboard = label.startDragAndDrop(TransferMode.MOVE);
ClipboardContent clipboardContent = new ClipboardContent();
clipboardContent.put(TAB_TYPE, 1);
dndTab = tab;
dragboard.setContent(clipboardContent);
event.consume();
});
return tab ;
}
}