【发布时间】：2012-03-07 11:27:42
【问题描述】：
我正在使用 javafx 2.0 和 netbean 7.1，在 ImageView 上拖放图像时遇到问题，我将图像保留为源（一个图像）和 2 个目标点（2 个框为目标点）。第一次尝试拖动图像时，它的工作正常，并且在将源图像输入到目标框后。再次尝试拖动图像，出现以下错误“java.lang.IllegalArgumentException：错误的字节缓冲区大小18x15 [1080] != 0"
一旦图像移动到目标对象，我需要设置监听器将其更改为源，我觉得它在这个地方抛出错误..
代码正在使用
public class DragandDropEx extends Application {
/**
* @param args the command line arguments
*/
GridPane Board;
ImageView deactivateImageView = new ImageView();
ImageView newImageView = new ImageView();
final Rectangle target = new Rectangle(0, 0, 50, 50);
final Rectangle target2 = new Rectangle(0, 0, 50, 50);
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
target.setFill(Color.CHOCOLATE);
target2.setFill(Color.BLUE);
Image image = new Image(getClass().getResourceAsStream("triangle.png"));
getDeactivateImageView().setImage(image);
Board = new GridPane();
primaryStage.setTitle("Drag and Drop");
createSource(getDeactivateImageView());
target.setOnDragOver(new EventHandler<DragEvent>() {
@Override
public void handle(DragEvent events) {
events.acceptTransferModes(TransferMode.MOVE);
events.consume();
createTargetDrop(target,0,8);
}
});
target2.setOnDragOver(new EventHandler<DragEvent>() {
@Override
public void handle(DragEvent events) {
events.acceptTransferModes(TransferMode.MOVE);
events.consume();
createTargetDrop(target2,0,9);
}
});
Board.add(getDeactivateImageView(), 0, 1);
Board.add(target, 0, 8);
Board.add(target2, 0, 9);
StackPane root = new StackPane();
root.getChildren().add(Board);
primaryStage.setScene(new Scene(root, 300, 250));
primaryStage.show();
}
private void createSource(final ImageView imageView) {
imageView.setOnDragDetected(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent events) {
Dragboard storeImage =imageView.startDragAndDrop(TransferMode.MOVE);
ClipboardContent content = new ClipboardContent();
content.putImage(imageView.getImage());
storeImage.setContent(content); **// here i am getting error**
events.consume();
}
});
}
private void createTargetDrop(final Rectangle target,final int xCordination,final int yCordination) {
target.setOnDragDropped(new EventHandler<DragEvent>() {
@Override
public void handle(DragEvent event) {
Dragboard db = event.getDragboard();
Image dragedImage = db.getImage();
getNewImageView().setImage(dragedImage);
getDeactivateImageView().setVisible(false);
setDeactivateImageView(getNewImageView());
Board.add(getDeactivateImageView(),xCordination,yCordination );
event.consume();
createSource(getDeactivateImageView()); // setting listener to new image
}
});
}
}
【问题讨论】：