Question

我希望得到一些关于在tabpane中为每个选项卡提供fx：include语句的答案。我已经轻松地管理内容以显示但是相关控制器类的引用方法只是给我一个nullpointerreference异常，无论我如何构造它。包含的FXML布局的控制器既没有构造函数也没有初始化（）方法，是否需要它们？我尝试了一些不同的东西，但总是得到同样的例外。

我只是在tabpane中添加了一个更改侦听器，当按下一个选项卡时，我想填充一些文本字段，其中一些值来自全局可访问的arraylist。注意：arraylist不是问题，使用主控制器执行此操作工作正常。

我将很快添加一个代码示例，但现在不能。如果您需要更多信息，请告诉我，否则我会在今天晚些时候发布代码。

*编辑，这是我的代码示例，取自StackOverflow上的另一个线程。 JavaFX TabPane - One controller for each tab

TestApp.java：

public class TestApp extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        Scene scene = new Scene(new StackPane());

        FXMLLoader loader = new FXMLLoader(getClass().getResource("/view/MainTestWindow.fxml"));
        scene.setRoot(loader.load());
        MainTestController controller = loader.getController();
        controller.init();

        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

主控制器，我想引用子控制器。

public class MainTestController {

    @FXML private TabPane tabPane;
    // Inject tab content.
    @FXML private Tab fooTabPage;
    // Inject controller
    @FXML private FooTabController fooTabPageController;

    // Inject tab content.
    @FXML private Tab barTabPage;
    // Inject controller
    @FXML private BarTabController barTabPageController;

    public void init() {
        tabPane.getSelectionModel().selectedItemProperty().addListener((ObservableValue<? extends Tab> observable,
                                                                        Tab oldValue, Tab newValue) -> {
            if (newValue == barTabPage) {
                System.out.println("Bar Tab page");
                barTabPageController.handleButton();
            } else if (newValue == fooTabPage) {
                System.out.println("Foo Tab page");
                fooTabPageController.handleButton();
            }
        });
    }
}

主视图的.fxml

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

<?import javafx.scene.control.TabPane?>
<?import javafx.scene.control.Tab?>

<TabPane fx:id="tabPane" fx:controller="controller.MainTestController" xmlns="http://javafx.com/javafx/8.0.40"
         xmlns:fx="http://www.w3.org/2001/XInclude">
    <tabs>
        <Tab fx:id="fooTabPage" text="FooTab">
            <fx:include source="fooTabPage.fxml"/>
        </Tab>
        <Tab fx:id="barTabPage" text="BarTab">
            <fx:include source="barTabPage.fxml"/>
        </Tab>
    </tabs>
</TabPane>

FooTab：

public class FooTabController {
    @FXML private Label lblText;

    public void handleButton() {
        lblText.setText("Byebye!");
    }
}

FooTab的.fxml：

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

<?import javafx.scene.layout.VBox?>
<?import javafx.scene.control.Label?>

<?import javafx.scene.control.Button?>
<VBox xmlns:fx="http://www.w3.org/2001/XInclude" fx:controller="controller.FooTabController">
    <Label fx:id="lblText" text="Helllo"/>
    <Button fx:id="btnFooTab" onAction="#handleButton" text="Change text"/>
</VBox>

BarTab：

public class BarTabController {
    @FXML private Label lblText;

    public void handleButton() {
        lblText.setText("Byebye!");
    }
}

BarTab的.fxml

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

<?import javafx.scene.layout.VBox?>
<?import javafx.scene.control.Label?>

<?import javafx.scene.control.Button?>
<VBox xmlns:fx="http://www.w3.org/2001/XInclude" fx:controller="controller.BarTabController">
    <Label fx:id="lblText" text="Helllo" />
    <Button fx:id="btnBarTab" onAction="#handleButton" text="Change text"/>
</VBox>

FooTab和BarTab的上述onAction使用各自的按钮。当这个方法（handleButton）是来自主控制器的引用时，就是我得到异常的时候。

Answer 1

要为包含的FMXL文件注入控制器，您需要fx:id元素上的<fx:include>属性。控制器将注入"Controller"附加fx:id值的字段。

如果您想要注入实际的Tab，则需要单独的fx:id。

所以：

<tabs>
    <Tab fx:id="fooTab" text="FooTab">
        <fx:include fx:id="fooTabPage" source="fooTabPage.fxml"/>
    </Tab>
    <Tab fx:id="barTab" text="BarTab">
        <fx:include fx:id="barTabPage" source="barTabPage.fxml"/>
    </Tab>
</tabs>

和

@FXML private TabPane tabPane;
// Inject tab content.
@FXML private Tab fooTab;
// Inject controller
@FXML private FooTabController fooTabPageController;

// Inject tab content.
@FXML private Tab barTab;
// Inject controller
@FXML private BarTabController barTabPageController;

Answer 2

结论：示例模板“注入SubControllers”
- 上面的例子让我非常了解注入机制。谢谢。
- 我重新编写了代码，使其更加透明和清晰 - 以下代码已完成且正常工作

Tab1fooController.java

public class TabPaneRootController {

    @FXML private TabPane tabPane;

    //###################################Inject part#############################################
    // Inject tab content
    @FXML private Tab tab1_foo; //from TabPaneRootView.fxml: <Tab fx:id="tab1_foo" ...>
    @FXML private Tab tab2_bar; //from TabPaneRootView.fxml: <Tab fx:id="tab2_bar" ...>

    // Inject tab controller
    @FXML private Tab1fooController xxx_tab1foo_xxxController;//TabPaneRootView.fxml_include_fx:id="xxx_tab1foo_xxx" + "Controller"
    @FXML private Tab2barController xxx_tab2bar_xxxController;//TabPaneRootView.fxml_include_fx:id="xxx_tab2bar_xxx" + "Controller"
   //###########################################################################################

        public void init() {
               tabPane.getSelectionModel().selectedItemProperty().addListener((ObservableValue<? extends Tab> observable,
                                                                    Tab oldValue, Tab newValue) -> {                                                                                                    
            if (newValue == tab2_bar) {
                System.out.println("- 2.Tab bar -");
                System.out.println("xxx_tab2bar_xxxController=" + xxx_tab2bar_xxxController); //if =null => inject problem 
                xxx_tab2bar_xxxController.handleTab2ButtonBar();
            } else if (newValue == tab1_foo) {
                System.out.println("- 1.Tab foo -");
                System.out.println("xxx_tab1foo_xxxController=" + xxx_tab1foo_xxxController); //if =null => inject problem
                xxx_tab1foo_xxxController.handleTab1ButtonFoo();
            } else {
                System.out.println("- another Tab -");
            }
        });
    }
}

tabPaneRootView.fxml

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

<?import javafx.scene.control.Tab?
<?import javafx.scene.control.TabPane?>

<TabPane fx:id="tabPane" xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1"  fx:controller="controller.TabPaneRootController">
<tabs>
    <Tab fx:id="tab1_foo" text="myTab1foo">
        <fx:include fx:id="xxx_tab1foo_xxx" source="tab1fooView.fxml" />
    </Tab>
    <Tab fx:id="tab2_bar" text="myTab2bar">
        <fx:include fx:id="xxx_tab2bar_xxx" source="tab2barView.fxml" />
    </Tab>
</tabs>

Tab1fooController.java

public class Tab1fooController {
    @FXML private Label tab1_label_showText;

    public void handleTab1ButtonFoo() {
        if( tab1_label_showText.getText().equals("tab1 aaa") ) {
            tab1_label_showText.setText("tab1 iii");
        } else {
            tab1_label_showText.setText("tab1 aaa");
        }
    }
}

tab1fooView.fxml

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.VBox?>

<VBox xmlns="http://javafx.com/javafx/8.0.111" xmlns:fx="http://javafx.com/fxml/1" fx:controller="controller.Tab1fooController">
    <Label fx:id="tab1_label_showText" text="Tab1_start" />
    <Button fx:id="tab1_button_foo" onAction="#handleTab1ButtonFoo" text="tab1_button_foo" />
</VBox>

Tab2barController.java

public class Tab2barController {
    @FXML private Label tab2_label_showText;

    public void handleTab2ButtonBar() {             
        if( tab2_label_showText.getText().equals("tab2 bbb") ) {
            tab2_label_showText.setText("tab2 jjj");
        } else {
            tab2_label_showText.setText("tab2 bbb");
        }
    }
}

tab2barView.fxml

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

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.layout.VBox?>

<VBox xmlns:fx="http://javafx.com/fxml/1" xmlns="http://javafx.com/javafx/8.0.111" fx:controller="controller.Tab2barController">
    <Label fx:id="tab2_label_showText" text="Tab2_start" />
    <Button fx:id="tab2_button_bar" onAction="#handleTab2ButtonBar" text="tab2_button_bar" />
</VBox>

TestApp.java

public class TestApp extends Application {
    @Override
    public void start(Stage primaryStage) throws Exception {
        Scene scene = new Scene(new StackPane());

        FXMLLoader loader = new FXMLLoader(getClass().getResource("/view/tabPaneRootView.fxml"));
        scene.setRoot(loader.load());
        TabPaneRootController controller = loader.getController();
        controller.init();

        primaryStage.setScene(scene);
        primaryStage.setTitle("Inject TabController");
        primaryStage.show();
    }

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

- Directory structure
- Example started

JavaFX 8 - 每个选项卡都有单独的FXML和控制器的Tabpanes和选项卡

2 个答案: