JavaFx之不通过全局静态变量进行窗体通信

百度了n多窗体通信，，，总是通过定义全局静态变量进行传值通信。。我个人不喜欢一个controller里写满所有的布局（这样显得臃肿，但是组件传值方便）。有没有另外的办法进行模块化并且可以传值呢。。

肯定是有的。。。

1.定义一个泛型类接收Controller对象与Stage对象

public class StageAndController<C, S> {
    private C controller;
    private S stage;

    public StageAndController(C controller, S stage) {
        this.controller = controller;
        this.stage = stage;
    }
    public StageAndController(C controller) {
        this.controller = controller;
    }

    public C getController() {
        return controller;
    }

    public void setController(C controller) {
        this.controller = controller;
    }

    public S getStage() {
        return stage;
    }

    public void setStage(S stage) {
        this.stage = stage;
    }
}

这里之所以返回两个对象，，首先每个controller都对应一个打开的布局窗体，controller用来传值、赋值、初始化操作，stage本身需要调用show()才显示，，所以定义此类

2.封装 打开一个窗体或者动态加载一个Node

public static StageAndController addMenu(final Pane pane, final String fxmlName, Object controller) {
        URL location = AddOperation.class.getResource("/fxml/" + fxmlName);
        FXMLLoader fxmlLoader = new FXMLLoader();
        fxmlLoader.setLocation(location);
        fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
        try {
            Node node = fxmlLoader.load();//返回Node对象  Node是布局顶级父类，再之上就是Object,所有此处可以加载一个布局添加到父级中
            pane.getChildren().add(node);//Node添加到父级布局
            controller = fxmlLoader.getController();//获取加载布局的Contrller对象
        } catch (IOException e) {
            e.printStackTrace();
        }
        return new StageAndController(controller);//返回controller实例
    }

//pane->需要添加node的父级Pane及Pane子类对象  fxmlName-->自定义的布局文件   Object-->需要实例化的Controller

这里我的用法是动态增加一排菜单栏，使用了到了controller传值作用，用法如下：

StageAndController controller = AddOperation.addMenu(operation, "read_item.fxml", ReadCardController.class);
        readCardController = (ReadCardController) controller.getController();

向父级窗体暴露了一个Controller实例对象，就可以进行父窗体向子组件传值，初始化。

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 public static StageAndController newDialog(String fxmlName, String title, Object controller) {
        URL location = OpenDialog.class.getResource("/fxml/" + fxmlName);
        FXMLLoader fxmlLoader = new FXMLLoader();
        fxmlLoader.setLocation(location);
        fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
        Stage stage = new Stage();
        try {
            Pane dialogPane = fxmlLoader.load();
            stage.setScene(new Scene(dialogPane));
            stage.initModality(Modality.APPLICATION_MODAL);
            stage.initStyle(StageStyle.DECORATED);
            stage.setResizable(false);
            if (title != null) {
                stage.setTitle(title);
            }
            controller = fxmlLoader.getController();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return new StageAndController(controller, stage);

此处同理，加载的是一个窗体布局，同时设置模态化（本身未关闭，父级窗体不可点击）、动态标题，，，，，返回一个Controller与Stage对象，，，用法如下：

 StageAndController stageAndController = OpenDialog.newDialog("connectDevice.fxml", "连接", ConnectDevice.class);
        ConnectDevice controller = (ConnectDevice) stageAndController.getController();
        Stage stage = (Stage) stageAndController.getStage();
        controller.str= str;
        controller.init();
        stage.show();

窗体显示之前父窗体向子窗体传值或者做一些初始化。 这样模块化布局传值也变得简单好维护。

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嫌弃自带窗体风格太丑，，可以往下看。。

自定义Stage窗体布局（State设置透明时）：

public static StageAndController customDialog(String fxmlName, Object controller, Pane pane, String css) {
        URL location = OpenDialog.class.getResource("/fxml/" + fxmlName);
        FXMLLoader fxmlLoader = new FXMLLoader();
        fxmlLoader.setLocation(location);
        fxmlLoader.setBuilderFactory(new JavaFXBuilderFactory());
        Stage stage = new Stage();
        try {
            pane = fxmlLoader.load();
            Background background = new Background(new BackgroundFill(Paint.valueOf("#EFEFEF"), new CornerRadii(15), new Insets(0)));
            pane.setBackground(background);
            pane.setBorder(new Border(new BorderStroke(Color.valueOf("#0096C9"), BorderStrokeStyle.SOLID, new CornerRadii(15), new BorderWidths(2))));
            Scene scene = new Scene(pane);
            if (css != null) {
                scene.getStylesheets().add(OpenDialog.class.getResource("/css/" + css).toExternalForm());
            }
            scene.setFill(Paint.valueOf("#FFFFFF00"));//设置场景透明

            stage.initModality(Modality.APPLICATION_MODAL);
            stage.initStyle(StageStyle.TRANSPARENT);
            stage.setResizable(false);
            stage.setScene(scene);
            controller = fxmlLoader.getController();

        } catch (IOException e) {
            e.printStackTrace();
        }
        return new StageAndController(controller, stage);
    }

用法差不多，加了一个自定义加载css样式，可以按需更改，，不过自定义时，，窗体头部拖动就不可用，下面贴出解决方案：

public class DragListener implements EventHandler<MouseEvent> {

    private double xOffset = 0;
    private double yOffset = 0;
    private final Stage stage;

    public DragListener(Stage stage) {
        this.stage = stage;
    }

    @Override
    public void handle(MouseEvent event) {
        event.consume();
        if (event.getEventType() == MouseEvent.MOUSE_PRESSED) {
            xOffset = event.getSceneX();
            yOffset = event.getSceneY();
        } else if (event.getEventType() == MouseEvent.MOUSE_DRAGGED) {
            stage.setX(event.getScreenX() - xOffset);
            if(event.getScreenY() - yOffset < 0) {
                stage.setY(0);
            }else {
                stage.setY(event.getScreenY() - yOffset);
            }
        }
    }

    public void enableDrag(Node node) {
        node.setOnMousePressed(this);
        node.setOnMouseDragged(this);
    }
}

用法如下：

  StageAndController stageAndController = OpenDialog.customDialog("connectDevice_cus.fxml",ConnectDevice.class,new Pane(),null);
        ConnectDevice controller = (ConnectDevice) stageAndController.getController();
        Stage stage = (Stage) stageAndController.getStage();
        new DragListener(stage).enableDrag(controller.title);//自定义窗口时设置拖动监听   此处controller.title是我自定义窗体标题栏的HBox对象
        controller.stage = stage;
        controller.init();
        stage.show();

这样就可以愉快的使用自定义弹窗了。。。。

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