从 FXML 控制器中的其他类调用方法答案

【问题标题】：Calling methods from other classes in FXML controller从 FXML 控制器中的其他类调用方法
【发布时间】：2014-04-08 23:47:25
【问题描述】：

我目前正在做作业，使用场景构建器在 javaFX 中创建一个带有多个选项卡的 Web 浏览器，并在 FXML 控制器中进行编码。我很新，但我似乎无法弄清楚如何从控制器类中的其他类访问其他方法。

我有一个文件名为 FXMLDocumentController.java，我的所有编码都在其中，另一个文件名为 Name.java，它只加载由场景构建器创建的 .fxml 文档。

package name;



public class FXMLDocumentController implements Initializable {

@FXML
private Tab TabPanel1;

@FXML
private Button backButton;

@FXML
private Button forwardButton;

@FXML
private Button goButton;

@FXML
private Label label;

@FXML
private MenuBar menubar1;

@FXML
private Button stopButton;

@FXML
private AnchorPane textArea1;

@FXML
private ComboBox urlAddress;

@FXML
private WebView webview1;
private WebEngine webEngine;

@FXML
void backButtonClickAction(ActionEvent event) {
    WebHistory history = webEngine.getHistory();
    int back = history.getCurrentIndex();
    if (back <= 0) {
    } else {
        history.go(-1);
    }

}

@FXML
void forwardButtonClickAction(ActionEvent event) {
    WebHistory history = webEngine.getHistory();
    int fwd = history.getCurrentIndex();
    fwd++;
    ObservableList<WebHistory.Entry> entryList = history.getEntries();
    int stop = entryList.size();
    if (fwd == stop) {
    } else {
        history.go(1);
    }
}

@FXML
void stopButtonAction(ActionEvent event) {
    webEngine.getLoadWorker().cancel();
}

@FXML
void goButtonAction(ActionEvent event) {
    String url = urlAddress.getValue().toString();
    if (url.startsWith("http://www.")) {
        webEngine.load(url);
    } else if (url.startsWith("www.")) {
        webEngine.load("http://" + url);
    } else {
        webEngine.load("http://www." + url);
    }

    //TabPanel1.setText(webEngine.getLocation());
    //System.out.println(webEngine.getTitle());
}

@FXML
void urlAddressEnter(ActionEvent event) {
    String url = urlAddress.getValue().toString();
    if (url.startsWith("http://www.")) {
        webEngine.load(url);
    } else if (url.startsWith("www.")) {
        webEngine.load("http://" + url);
    } else {
        webEngine.load("http://www." + url);
    }
}

@Override
public void initialize(URL url, ResourceBundle rs) {
    assert TabPanel1 != null : "fx:id=\"TabPanel1\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert backButton != null : "fx:id=\"backButton\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert forwardButton != null : "fx:id=\"forwardButton\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert goButton != null : "fx:id=\"goButton\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert label != null : "fx:id=\"label\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert menubar1 != null : "fx:id=\"menubar1\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert stopButton != null : "fx:id=\"stopButton\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert textArea1 != null : "fx:id=\"textArea1\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert urlAddress != null : "fx:id=\"urlAddress\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    assert webview1 != null : "fx:id=\"webview1\" was not injected: check your FXML file 'FXMLDocument.fxml'.";
    webEngine = webview1.getEngine();
    getHistory();

}

private void getHistory() {
    final WebHistory history = webEngine.getHistory();
    history.getEntries().addListener(new ListChangeListener<WebHistory.Entry>() {
        @Override
        public void onChanged(ListChangeListener.Change<? extends WebHistory.Entry> c) {
            c.next();
            for (WebHistory.Entry e : c.getRemoved()) {
                urlAddress.getItems().remove(e.getUrl());
            }
            for (WebHistory.Entry e : c.getAddedSubList()) {
                urlAddress.getItems().add(e.getUrl());
            }
        }
    });
}

}

这将创建一个带有后退、前进、停止和历史下拉列表的浏览器。我现在需要创建多个选项卡，因此我需要创建一个新的 .java 文件，该文件将创建新选项卡并具有返回当前 Web 引擎的方法，因此我可以实现所有这些功能。

问题是，当我创建一个新类时，我无法从控制器访问它，我不断收到错误消息。例如，如果我有一个名为 BrowserTab 的新文件和一个名为 newBrowserTab 的方法，那么我如何使用我的所有其他代码从控制器文件中调用该方法。我想它会是这样的：

BrowserTab.newBrowserTab(tabPane, "New Tab")

【问题讨论】：

标签： java controller javafx fxml scenebuilder

【解决方案1】：

请参阅static methods 以获得快速解决方案。

静态方法是最直接的，但不是非常面向对象的。 passing object instances around to FXML controllers 的其他方法不涉及静态方法，提供更好的封装、实例化、多态支持等，全局状态更少。

【讨论】：