[英]Handling events in Controller in JavaFX and MVC (Not FXML)
I'm learning JavaFx now and MVC and I'm trying to connect my button to the model through the Controller. 我现在正在学习JavaFx和MVC,并且试图通过Controller将我的按钮连接到模型。 I tried many ways to use
button.setOnActive(EventHandler e);
我尝试了多种方法来使用
button.setOnActive(EventHandler e);
but it doesn't work outside the view class so what is the proper way to do it? 但是它在视图类之外不起作用,那么正确的方法是什么?
this is my View class 这是我的View班
public class View extends Application{
private TextField num1;
private Label addLabel;
private TextField num2;;
public Button calcB;
private TextField sol;
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle("Calculator");
num1 = new TextField();
addLabel = new Label("+");
num2 = new TextField();
calcB = new Button("Calculate");
**// I'm trying to use this in the Controller
calcB.setOnAction(event -> System.exit(0));**
sol = new TextField();
FlowPane flowPane = new FlowPane();
flowPane.getChildren().addAll(num1, addLabel, num2, calcB, sol);
Scene scene = new Scene(flowPane, 600, 200);
primaryStage.setScene(scene);
primaryStage.show();
}
public int getNum1(){
return Integer.parseInt(num1.getText());
}
public int getNum2(){
return Integer.parseInt(num2.getText());
}
public void setSol(int sol){
this.sol.setText(Integer.toString(sol));
}
and this is my Controller Class 这是我的控制器类
public class Controller{
private View theView;
private Model theModel;
public Controller(Button b, EventHandler<ActionEvent> e) {
this.theView = theView;
this.theModel = theModel;
**//SetOnActive() method should be somewhere in this Class**
}
I know that I should connect the button to a method in the model but right now I just want to know how I can make it work. 我知道我应该将按钮连接到模型中的方法,但是现在我只想知道如何使它起作用。
My model 我的模特
public class Model {
private int calculationValue;
public void addTwoNumbers(int firstNumber, int secondNumber){
calculationValue = firstNumber + secondNumber;
}
public int getCalculationValue() {
return calculationValue;
}
} }
this is my main too 这也是我的主要
public class Main {
public static void main(String[] args){
View view = new View();
Model model = new Model();
Controller controller = new Controller(view, model);
Application.launch(View.class, args);
}
Create a blank project with a ControllerA, ControllerB, Driver, ViewA, and ViewB classes using the code below, then run the code from the main method within the Driver class. 使用下面的代码用ControllerA,ControllerB,Driver,ViewA和ViewB类创建一个空白项目,然后从Driver类中的main方法运行代码。
This should hopefully show you how events can be handled by a controller. 希望它可以向您显示控制器如何处理事件。
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Driver extends Application {
public static void main(final String[] args) {
launch();
}
@Override
public void init() {}
@Override
public void start(final Stage primaryStage) throws Exception {
final Scene scene = new Scene(new ControllerA(primaryStage).getView());
primaryStage.setScene(scene);
primaryStage.show();
}
}
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class ControllerA implements EventHandler {
private final Stage primaryStage;
private final ViewA view = new ViewA(this);
public ControllerA(final Stage primaryStage) {
this.primaryStage = primaryStage;
}
@Override
public void handle(final Event event) {
final Object source = event.getSource();
if (source.equals(view.getButton())) {
System.out.println("ButtonA has been pressed, switching to ViewB.");
final ControllerB controllerB = new ControllerB(primaryStage);
final Scene scene = new Scene(controllerB.getView());
primaryStage.setScene(scene);
}
}
public Stage getPrimaryStage() {
return primaryStage;
}
public ViewA getView() {
return view;
}
}
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
public class ViewA extends HBox {
private final Button button = new Button("ButtonA");
public ViewA(final ControllerA controllerA) {
button.setOnAction(controllerA);
this.getChildren().addAll(button);
}
public Button getButton() {
return button;
}
}
import javafx.stage.Stage;
public class ControllerB {
private final Stage primaryStage;
private final ViewB view = new ViewB(this);
public ControllerB(final Stage primaryStage) {
this.primaryStage = primaryStage;
}
public Stage getPrimaryStage() {
return primaryStage;
}
public ViewB getView() {
return view;
}
}
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
public class ViewB extends HBox {
private final Button button = new Button("ButtonB");
public ViewB(final ControllerB controllerB) {
button.setOnAction(event -> {
System.out.println("ButtonB has been pressed, switching to ViewA.");
final Stage primaryStage = controllerB.getPrimaryStage();
final ControllerA controllerA = new ControllerA(primaryStage);
final Scene scene = new Scene(controllerA.getView());
primaryStage.setScene(scene);
});
this.getChildren().addAll(button);
}
public Button getButton() {
return button;
}
}
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