使用没有FXML的JavaFX控制器

时间:2016-04-26 14:47:34

标签: java javafx-8 fxml

是否可以在不使用FXML的情况下使用带有JavaFX GUI的控制器。

我注意到FXML文件包含一个fx-controller属性来绑定控制器,但我觉得它不是一种简单的方法来处理它。

关于在不使用FXML文件或JavaFX场景生成器的情况下使用JavaFX创建MVC的任何想法?

3 个答案:

答案 0 :(得分:13)

您的问题对我来说并不是特别清楚:您只需创建课程,并将所有内容与听众联系起来。我不知道这是否有帮助,但这里有一个简单的例子,它只有几个文本字段和一个显示其总和的标签。这就是我认为的经典MVC":如果模型发生变化,视图会观察模型并更新UI元素。它将处理程序与UI元素一起注册,并在事件发生时委托给控制器:控制器依次处理输入(如果需要)并更新模型。

型号:

package mvcexample;

import javafx.beans.property.IntegerProperty;
import javafx.beans.property.ReadOnlyIntegerWrapper;
import javafx.beans.property.SimpleIntegerProperty;

public class AdditionModel {
    private final IntegerProperty x = new SimpleIntegerProperty();
    private final IntegerProperty y = new SimpleIntegerProperty();
    private final ReadOnlyIntegerWrapper sum = new ReadOnlyIntegerWrapper();

    public AdditionModel() {
        sum.bind(x.add(y));
    }

    public final IntegerProperty xProperty() {
        return this.x;
    }

    public final int getX() {
        return this.xProperty().get();
    }

    public final void setX(final int x) {
        this.xProperty().set(x);
    }

    public final IntegerProperty yProperty() {
        return this.y;
    }

    public final int getY() {
        return this.yProperty().get();
    }

    public final void setY(final int y) {
        this.yProperty().set(y);
    }

    public final javafx.beans.property.ReadOnlyIntegerProperty sumProperty() {
        return this.sum.getReadOnlyProperty();
    }

    public final int getSum() {
        return this.sumProperty().get();
    }



}

控制器:

package mvcexample;

public class AdditionController {

    private final AdditionModel model ;

    public AdditionController(AdditionModel model) {
        this.model = model ;
    }

    public void updateX(String x) {
        model.setX(convertStringToInt(x));
    }

    public void updateY(String y) {
        model.setY(convertStringToInt(y));
    }

    private int convertStringToInt(String s) {
        if (s == null || s.isEmpty()) {
            return 0 ;
        }
        if ("-".equals(s)) {
            return 0 ;
        }
        return Integer.parseInt(s);
    }
}

查看:

package mvcexample;

import javafx.geometry.HPos;
import javafx.geometry.Pos;
import javafx.scene.Parent;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.control.TextFormatter;
import javafx.scene.control.TextFormatter.Change;
import javafx.scene.layout.ColumnConstraints;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.Priority;

public class AdditionView {
    private GridPane view ;
    private TextField xField;
    private TextField yField;
    private Label sumLabel;

    private AdditionController controller ;
    private AdditionModel model ;

    public AdditionView(AdditionController controller, AdditionModel model) {

        this.controller = controller ;
        this.model = model ;

        createAndConfigurePane();

        createAndLayoutControls();

        updateControllerFromListeners();

        observeModelAndUpdateControls();

    }

    public Parent asParent() {
        return view ;
    }

    private void observeModelAndUpdateControls() {
        model.xProperty().addListener((obs, oldX, newX) -> 
                updateIfNeeded(newX, xField));

        model.yProperty().addListener((obs, oldY, newY) -> 
                updateIfNeeded(newY, yField));

        sumLabel.textProperty().bind(model.sumProperty().asString());
    }

    private void updateIfNeeded(Number value, TextField field) {
        String s = value.toString() ;
        if (! field.getText().equals(s)) {
            field.setText(s);
        }
    }

    private void updateControllerFromListeners() {
        xField.textProperty().addListener((obs, oldText, newText) -> controller.updateX(newText));
        yField.textProperty().addListener((obs, oldText, newText) -> controller.updateY(newText));
    }

    private void createAndLayoutControls() {
        xField = new TextField();
        configTextFieldForInts(xField);

        yField = new TextField();
        configTextFieldForInts(yField);

        sumLabel = new Label();

        view.addRow(0, new Label("X:"), xField);
        view.addRow(1, new Label("Y:"), yField);
        view.addRow(2, new Label("Sum:"), sumLabel);
    }

    private void createAndConfigurePane() {
        view = new GridPane();

        ColumnConstraints leftCol = new ColumnConstraints();
        leftCol.setHalignment(HPos.RIGHT);
        leftCol.setHgrow(Priority.NEVER);

        ColumnConstraints rightCol = new ColumnConstraints();
        rightCol.setHgrow(Priority.SOMETIMES);

        view.getColumnConstraints().addAll(leftCol, rightCol);

        view.setAlignment(Pos.CENTER);
        view.setHgap(5);
        view.setVgap(10);
    }

    private void configTextFieldForInts(TextField field) {
        field.setTextFormatter(new TextFormatter<Integer>((Change c) -> {
            if (c.getControlNewText().matches("-?\\d*")) {
                return c ;
            }
            return null ;
        }));
    }
}

申请类:

package mvcexample;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class MVCExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        AdditionModel model = new AdditionModel();
        AdditionController controller = new AdditionController(model);
        AdditionView view = new AdditionView(controller, model);

        Scene scene = new Scene(view.asParent(), 400, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}

答案 1 :(得分:2)

我广泛使用JavaFX,不使用FXML或scenebuilder。所以我可以保证它可以做到。

下面是我的IDE为获取JavaFX主类而生成的自动生成的代码。这将是您的应用程序的根。然后,您将添加它以创建您的应用程序。

public class NewFXMain extends Application {

@Override
public void start(Stage primaryStage) {
    Button btn = new Button();
    btn.setText("Say 'Hello World'");
    btn.setOnAction(new EventHandler<ActionEvent>() {

        @Override
        public void handle(ActionEvent event) {
            System.out.println("Hello World!");
        }
    });

    StackPane root = new StackPane();
    root.getChildren().add(btn);

    Scene scene = new Scene(root, 300, 250);

    primaryStage.setTitle("Hello World!");
    primaryStage.setScene(scene);
    primaryStage.show();
}

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {
    launch(args);
}

}

答案 2 :(得分:0)

对于我们其余的人...这是一个非常简单的示例,显示了如何在不使用任何FXML文件的情况下创建JavaFX表单。该示例可以在已经运行的应用程序中使用,因此我已经跳过了Main类以及所有这些……这只是为了展示JavaFX的简单性。

简而言之,您只需基于诸如AnchorPane之类的容器创建场景,然后创建舞台并将场景分配给舞台...添加控件然后显示舞台

package javafx;

import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class SimpleFX {

    private AnchorPane anchorPane;

    private TextArea textArea () {
        TextArea textArea = new TextArea();
        textArea.setLayoutX(20);
        textArea.setLayoutY(20);
        textArea.setMaxWidth(450);
        textArea.setMinHeight(380);
        return textArea;
    }

    private TextField textField () {
        TextField textField = new TextField();
        textField.setLayoutX(20);
        textField.setLayoutY(410);
        textField.setMinWidth(450);
        textField.setMinHeight(25);
        return textField;
    }

    private Button button() {
        Button button = new Button("Button");
        button.setLayoutX(240);
        button.setLayoutY(450);
        return button;
    }


    private void addControls    () {
        anchorPane.getChildren().add(0,textArea());
        anchorPane.getChildren().add(1,textField());
        anchorPane.getChildren().add(2,button());
    }

    public void startForm () {
        anchorPane = new AnchorPane();
        Scene scene = new Scene(anchorPane, 500, 500);
        Stage stage = new Stage();
        stage.setScene(scene);
        addControls();
        stage.show();
    }
}