JavaFX拖放操作示例

package org.wing.jfx.drag; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.net.URL; import java.util.List; import java.util.ResourceBundle; import javafx.event.EventHandler; import javafx.fxml.FXML; import javafx.fxml.Initializable; import javafx.scene.control.Label; import javafx.scene.control.TextArea; import javafx.scene.image.Image; import javafx.scene.image.ImageView; import javafx.scene.input.ClipboardContent; import javafx.scene.input.DragEvent; import javafx.scene.input.Dragboard; import javafx.scene.input.MouseEvent; import javafx.scene.input.TransferMode; import javafx.scene.layout.AnchorPane; import javafx.scene.paint.Color; public class MainController implements Initializable { @FXML private AnchorPane mRoot; @FXML private Label m_drag, m_drop; @FXML private ImageView m_imageView; @FXML private TextArea m_textArea; @Override public void initialize(URL url, ResourceBundle resourceBundle) { m_drag.setOnDragDetected(new EventHandler<MouseEvent>() { @Override public void handle(MouseEvent event) { Dragboard dragboard = m_drag.startDragAndDrop(TransferMode.ANY); ClipboardContent content = new ClipboardContent(); content.putString(m_drag.getText()); dragboard.setContent(content); } }); m_drop.setOnDragEntered(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { m_drop.setTextFill(Color.RED); } }); m_drop.setOnDragExited(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { m_drop.setTextFill(Color.BLACK); } }); m_drop.setOnDragOver(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { if (event.getGestureSource() != m_drop && event.getDragboard().hasString()) { event.acceptTransferModes(TransferMode.COPY_OR_MOVE); } } }); m_drop.setOnDragDropped(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { Dragboard dragboard = event.getDragboard(); m_drop.setText(dragboard.getString()); } }); m_drag.setOnDragDone(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { m_drag.setText(""); } }); m_imageView.setOnDragOver(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { if (event.getGestureSource() != m_imageView) { event.acceptTransferModes(TransferMode.ANY); } } }); m_imageView.setOnDragDropped(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { Dragboard dragboard = event.getDragboard(); List<File> files = dragboard.getFiles(); if(files.size() > 0){ try { m_imageView.setImage(new Image(new FileInputStream(files.get(0)))); } catch (FileNotFoundException e) { e.printStackTrace(); } } } }); m_textArea.setOnDragOver(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { if (event.getGestureSource() != m_imageView) { event.acceptTransferModes(TransferMode.ANY); } } }); m_textArea.setOnDragDropped(new EventHandler<DragEvent>() { @Override public void handle(DragEvent event) { Dragboard dragboard = event.getDragboard(); List<File> files = dragboard.getFiles(); if(files.size() > 0){ m_textArea.setText(FileTools.readFile(files.get(0))); } } }); } }