javax：ListView：通过在ListView中选择项加载控制器

Question

我在这里找到了部分解决方案如何使用自定义对象在JavaFX中填充ListView？这里的javafx-listview项带有一个图像按钮，但问题仍然存在，我不知道如何以及在哪里放置 标记，以便在单击一个项时加载它。

Answer 1

您只需向列表视图的选择模型注册一个侦听器，并在选择更改时加载相应的视图。

例如，假设你有

public class View {

    private final String name ;
    private final Class<?> controllerType ;

    // You could assume that the resource is name+".fxml" if you want to rely on conventions like that
    // That would eliminate the need for another field here, but would prevent
    // e.g. names with whitespace etc.
    private final String resource ;

    public View(String name, Class<?> controllerType, String resource) {
        this.name = name ;
        this.controllerType = controllerType ;
        this.resource = resource ;
    }

    public String getName() {
        return name ;
    }

    public Class<?> getControllerType() {
        return controllerType ;
    }

    public String getResource() {
        return resource ;
    }

    @Override
    public String toString() {
        return name ;
    }
}

然后在FXML中：

<!-- imports, namespaces omitted -->

<BorderPane fx:id="root" fx:controller="app.MainController" ... >
    <left>
        <ListView fx:id="selector"/>
    </left>
</BorderPane>

package app ;

public class MainController {

    @FXML
    private BorderPane root ;

    @FXML
    private ListView<View> selector ;

    public void initialize() {
        selector.getSelectionModel().selectedItemProperty().addListener((obs, oldView, newView) -> {
            if (newView == null) {
                root.setCenter(null);
            } else {
                // assumes each FXML is in the same package as its controller
                // (which I think is a nice way to organize things)
                FXMLLoader loader = new FXMLLoader(newView.getControllerType().getResource(newView.getResource()));
                try {
                    root.setCenter(loader.load());
                } catch (IOException exc) {
                    // unrecoverable...
                    throw new UncheckedIOException(exc);
                }
            }
        });

        selector.getItems().addAll(
            new View("Fruits", FruitsController.class, "Fruits.fxml"),
            new View("Vegetables", VegetablesController.class, "Vegetables.fxml")
        );
    }
}