如何将命令模式与JavaFXGUI相结合?
我当前的控制器类如何将命令模式与JavaFXGUI相结合?,java,oop,javafx,actionevent,Java,Oop,Javafx,Actionevent,我当前的控制器类 public class Controller { @FXML public javafx.scene.image.ImageView imageView; @FXML private MenuItem openItem; @FXML public void openAction(ActionEvent event) { FileChooser fc = new FileChooser(); File file = fc.showOpenDialo
public class Controller {
@FXML
public javafx.scene.image.ImageView imageView;
@FXML
private MenuItem openItem;
@FXML
public void openAction(ActionEvent event) {
FileChooser fc = new FileChooser();
File file = fc.showOpenDialog(null);
try {
BufferedImage bufferedImage = ImageIO.read(file);
Image image = SwingFXUtils.toFXImage(bufferedImage, null);
imageView.setImage(image);
} catch (IOException e) {
System.out.println("lol");
}
}
我怎样才能将openAction函数逻辑放在它自己的类中?我需要为我的UI添加大约10-20个带有自己的actionevent侦听器的函数,我不希望所有这些函数都存在于这个控制器类中。不清楚您希望在什么上下文中使用该模式,因此我展示了一个接受窗口地址的转换示例(即,将其作为显示对话框的所有者提交) 它从一个描述命令的界面开始(在本例中,我选择返回
可选的)
从现在开始,我们可以通过实现Command
或扩展AbstractCommand
来实现我们想要的任何功能
这是load image命令的一个示例实现
public class LoadImageCommand extends AbstractCommand<Image> {
public LoadImageCommand() {
this(null);
}
public LoadImageCommand(Window window) {
super(window);
}
@Override
public Optional<Image> execute() {
Image image = null;
FileChooser fc = new FileChooser();
File file = fc.showOpenDialog(getWindow());
try {
if(file != null) {
BufferedImage bufferedImage = ImageIO.read(file);
image = SwingFXUtils.toFXImage(bufferedImage, null);
}
} catch (IOException e) {
System.out.println("lol");
}
return Optional.ofNullable(image);
}
}
如果要在不同的控制器中使用openAction,并且不想创建命令的单独实例
,请继承控制器
public abstract class AbstractCommand<R> implements Command<R> {
private Window window;
public AbstractCommand(Window window) {
this.window = window;
}
public Window getWindow() {
return window;
}
}
public class LoadImageCommand extends AbstractCommand<Image> {
public LoadImageCommand() {
this(null);
}
public LoadImageCommand(Window window) {
super(window);
}
@Override
public Optional<Image> execute() {
Image image = null;
FileChooser fc = new FileChooser();
File file = fc.showOpenDialog(getWindow());
try {
if(file != null) {
BufferedImage bufferedImage = ImageIO.read(file);
image = SwingFXUtils.toFXImage(bufferedImage, null);
}
} catch (IOException e) {
System.out.println("lol");
}
return Optional.ofNullable(image);
}
}
@FXML
private void openAction(ActionEvent event) {
new LoadImageCommand().execute().ifPresent(imageView::setImage);
}