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java - 如何从常规类访问控制器类的字段？- JavaFX胶子

问题描述

我正在使用 JavaFX 通过 Gluon 框架创建 Android/Iphone 应用程序。

我知道这种类型的“我怎样才能获得控制器类”的问题。但这是不同的。

我知道如何获得控制器类，但这不是我要求的。我问如何在不创建任何新对象的情况下从控制器类访问字段。

假设我们有一个这样的 JavaFX 控制器类：

public class PrimaryPresenter {

    @FXML
    private View primary;

    @FXML
    public LineChart<String, Number> lineChart; // Every time we update the socket, we update the chart too

    public void initialize() {

        primary.setShowTransitionFactory(BounceInRightTransition::new);
        primary.showingProperty().addListener((obs, oldValue, newValue) -> {
            if (newValue) {
                AppBar appBar = MobileApplication.getInstance().getAppBar();
                appBar.setNavIcon(MaterialDesignIcon.MENU.button(e -> 
                        MobileApplication.getInstance().getDrawer().open()));
                appBar.setTitleText("Plot");

            }
        });   

        /*
         * Initial stuffs for the lineChart
         */
        lineChart.setTitle("Adaptive MPC");
    }


}

我想lineChart从另一个类访问对象而不创建新的PrimaryPresenter控制器类。FXML 文件由 Scene Builder 创建。

我问这个问题的原因是因为我有另一个通过线程循环的类，并且该线程将lineChart实时更新对象。

标签： javajavafxgluongluon-mobile

解决方案

这是我的答案。在每个 Gluon 项目中，都有一个名为的类GluonApplication，它看起来像这样：

package com.gluonapplication;

import com.gluonapplication.thread.SocketConnection;
import com.gluonapplication.views.PrimaryView;
import com.gluonapplication.views.SecondaryView;
import com.gluonhq.charm.glisten.application.MobileApplication;
import com.gluonhq.charm.glisten.visual.Swatch;
import javafx.scene.Scene;
import javafx.scene.image.Image;
import javafx.stage.Stage;

public class GluonApplication extends MobileApplication {

    public static final String PRIMARY_VIEW = HOME_VIEW;
    public static final String SECONDARY_VIEW = "Secondary View";

    @Override
    public void init() {
        addViewFactory(PRIMARY_VIEW, () -> new PrimaryView().getView());
        addViewFactory(SECONDARY_VIEW, () -> new SecondaryView().getView());
        DrawerManager.buildDrawer(this);
    }

    @Override
    public void postInit(Scene scene) {
        Swatch.GREEN.assignTo(scene);

        scene.getStylesheets().add(GluonApplication.class.getResource("style.css").toExternalForm());
        ((Stage) scene.getWindow()).getIcons().add(new Image(GluonApplication.class.getResourceAsStream("/icon2.png")));

    }
}

可以访问控制器类中的所有字段。只需这样做：

public class GluonApplication extends MobileApplication {

    public static final String PRIMARY_VIEW = HOME_VIEW;
    public static final String SECONDARY_VIEW = "Secondary View";
    private SocketConnection socketConnection;
    private View primaryView; // Add
    private View secondaryView; // Add

    @Override
    public void init() {
        primaryView = new PrimaryView().getView();
        secondaryView = new SecondaryView().getView();
        addViewFactory(PRIMARY_VIEW, () -> primaryView);
        addViewFactory(SECONDARY_VIEW, () -> secondaryView);
        DrawerManager.buildDrawer(this);

        /*
         * This will start the socket connection
         */
        socketConnection = new SocketConnection(primaryView, secondaryView);
        socketConnection.start();
    }

    @Override
    public void postInit(Scene scene) {
        Swatch.GREEN.assignTo(scene);

        scene.getStylesheets().add(GluonApplication.class.getResource("style.css").toExternalForm());
        ((Stage) scene.getWindow()).getIcons().add(new Image(GluonApplication.class.getResourceAsStream("/icon2.png")));


    }
}

然后在SocketConnection的构造函数中。您可以像这样访问字段：

    /*
     * Constructor
     */
    public SocketConnection(View primaryView, View secondaryView) {

        /*
         * For secondaryView
         */
        statusTextField = (TextField) secondaryView.lookup("#statusTextField");
        ipAddressTextField = (TextField) secondaryView.lookup("#ipAddressTextField");
        startSignalModeComboBox = (ComboBox<String>) secondaryView.lookup("#startSignalModeComboBox");
        predictHorizonTextField = (TextField) secondaryView.lookup("#predictHorizonTextField");
        controlHorizonTextField = (TextField) secondaryView.lookup("#controlHorizonTextField");
        sampleTimeTextField = (TextField) secondaryView.lookup("#sampleTimeTextField");
        pwmDutyCallTextField = (TextField) secondaryView.lookup("#pwmDutyCallTextField");
        endTimeOfStartSignalTextField = (TextField) secondaryView.lookup("#endTimeOfStartSignalTextField");
        referencePointTextField = (TextField) secondaryView.lookup("#referencePointTextField");
        portTextField = (TextField) secondaryView.lookup("#portTextField");

        /*
         * For primaryView
         */
        lineChart = (LineChart<String, Number>) primaryView.lookup("#lineChart");

        /*
         * Declare the data object inside the chart
         */
        time_output = new Series<String, Number>();
        lineChart.getData().add(time_output);


    }

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