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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