Question

我的.fxml

中有这个简单的组合框

<ComboBox fx:id="comboShapes" prefWidth="150.0" value="Random">
    <items>
        <FXCollections fx:factory="observableArrayList">
            <String fx:value="Random" />
            <String fx:value="Small Exploder" />
            <String fx:value="Gospler Glider Run" />
            <String fx:id="comboGlider" fx:value="Glider" />
         </FXCollections>
   </items>
</ComboBox>

我想知道如何将set方法绑定到Controller中的不同choicebox字符串？

Answer 1

在您的控制器中为您的组合框定义onAction(ActionEvent event)操作处理程序。
通过onAction="#choiceMade"将fxml链接到控制器操作处理程序（其中choiceMade是我为操作处理程序方法选择的任意名称）。
在您的操作处理程序中，对组合框值执行切换以调用所选值的相应方法处理程序。

应用/ ComboAction.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import java.lang.String?>
<?import javafx.collections.FXCollections?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.VBox?>

<VBox maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="104.0" prefWidth="226.0" spacing="10.0" xmlns="http://javafx.com/javafx/8.0.65" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.ComboActionController">
   <children>
      <Label fx:id="choiceLabel" />
      <ComboBox fx:id="comboShapes" onAction="#choiceMade" prefWidth="150.0" value="Random">
         <items>
            <FXCollections fx:factory="observableArrayList">
               <String fx:value="Random" />
               <String fx:value="Small Exploder" />
               <String fx:value="Gospler Glider Run" />
               <String fx:value="Glider" />
            </FXCollections>
         </items>
      </ComboBox>
   </children>
   <padding>
      <Insets bottom="10.0" left="10.0" right="10.0" top="10.0" />
   </padding>
</VBox>

应用/ ComboActionApp.java

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

public class ComboActionApp extends Application {
    @Override
    public void start(Stage stage) throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("ComboAction.fxml"));
        Parent root = loader.load();
        stage.setScene(new Scene(root));
        stage.show();
    }

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

应用/ ComboActionController.java

import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;

public class ComboActionController {

    @FXML
    private ComboBox<String> comboShapes;

    @FXML
    private Label choiceLabel;

    @FXML
    void choiceMade(ActionEvent event) {
        String choice = comboShapes.getValue();

        choiceLabel.setText(
                "Chosen: " + choice
        );

        switch (choice) {
            case "Random":
                randomChosen();
                break;

            case "Small Exploder":
                smallExploderChosen();
                break;

            case "Gospler Glider Run":
                gliderChosen();
                break;
        }
    }

    private void gliderChosen() {
        // todo implement action handler.
    }

    private void smallExploderChosen() {
        // todo implement action handler.
    }

    private void randomChosen() {
        // todo implement action handler.
    }

}

如何在JavaFX中将方法绑定到组合框？

1 个答案: