在 JavaFX 控制器中获取被点击对象的 id 的更好方法
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Better way for Getting id of the clicked Object in JavaFX controller
提问by Daniel R.
I`m looking for a better way for getting the id of the clicked object inside the event handler for this object.
我正在寻找一种更好的方法来在此对象的事件处理程序中获取单击对象的 id。
I already found this:
我已经找到了这个：
javafx pass fx:id to controller or parameter in fxml onAction method
javafx 将 fx:id 传递给 fxml onAction 方法中的控制器或参数
But that did not work for me.
但这对我不起作用。
Now I'm using the getId() function of the node class like this:
现在我正在使用节点类的 getId() 函数，如下所示：
Button btn = (Button) event.getSource();
String id = btn.getId();
But i want to use this method not only for buttons.
但我想不仅将这种方法用于按钮。
采纳答案by ItachiUchiha
Since fx:id is used to bind controls between FXML and Controller, this answer is taking into consideration that OP wants the idof the controls when clicked.
由于 fx:id 用于在 FXML 和 Controller 之间绑定控件，因此此答案考虑到 OPid在单击时需要控件的 。
import javafx.application.Application;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Control;
import javafx.scene.control.Label;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public class IdForControlsOnClick extends Application{
@Override
public void start(Stage stage) throws Exception {
BorderPane borderPane = new BorderPane();
VBox vBox = new VBox(20);
borderPane.setCenter(vBox);
Button button = new Button("Hi");
button.setId("Button");
Label label = new Label("Label");
label.setId("Label");
CheckBox checkBox = new CheckBox();
checkBox.setId("CheckBox");
button.addEventHandler(MouseEvent.MOUSE_CLICKED, new MyEventHandler());
label.addEventHandler(MouseEvent.MOUSE_CLICKED, new MyEventHandler());
checkBox.addEventHandler(MouseEvent.MOUSE_CLICKED, new MyEventHandler());
vBox.getChildren().addAll(button, label, checkBox);
Scene scene = new Scene(borderPane, 200, 200);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
private class MyEventHandler implements EventHandler<Event>{
@Override
public void handle(Event evt) {
System.out.println(((Control)evt.getSource()).getId());
}
}
}
回答by Michael Sims
I use this for getting the id of ImageView objects that all share the same event code. Here is a simple example using MouseEvent:
我使用它来获取共享相同事件代码的 ImageView 对象的 id。这是一个使用 MouseEvent 的简单示例：
@FXML
private void selectImage(MouseEvent event)
{
String source1 = event.getSource().toString(); //yields complete string
String source2 = event.getPickResult().getIntersectedNode().getId(); //returns JUST the id of the object that was clicked
System.out.println("Full String: " + source1);
System.out.println("Just the id: " + source2);
System.out.println(" " + source2);
}
Here is the output in my situation, where I used SceneBuilder to assign the selectImage method to the 'On Mouse Pressed' event, then running the code and randomly clicking on three different ImageView objects:
这是我的情况下的输出，我使用 SceneBuilder 将 selectImage 方法分配给 'On Mouse Pressed' 事件，然后运行代码并随机单击三个不同的 ImageView 对象：
Full String: ImageView[id=iv1, styleClass=image-view]
Just the id: iv1
Full String: ImageView[id=iv4, styleClass=image-view]
Just the id: iv4
Full String: ImageView[id=iv6, styleClass=image-view]
Just the id: iv6
Full String: ImageView[id=iv1, styleClass=image-view]
Just the id: iv1
Full String: ImageView[id=iv4, styleClass=image-view]
Just the id: iv4
Full String: ImageView[id=iv6, styleClass=image-view]
Just the id: iv6
I hope this helps someone. :-)
我希望这可以帮助别人。:-)
