阶段在创建新控件后会丢失填充(梯度)。

Question

我已将重新创建的内容简化为以下几个部分。实例化ToggleButton的行会使我的舞台失去填充颜色；它变成白色。我刚刚开始使用JavaFX，所以如果我正在做一些不该做的事情，请告诉我，这里。这是使用jre1.8.0_92与Eclipse (jfx8_2.3.0插件)在Windows7 sp1上。

public class Main extends Application {

    public static void main(String[] args) {

        if(args.length > 0) { 
            String s = args[0].toLowerCase();
            if(s.equals("full"))
                    Machine.isFullScreen = true;
        }
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {

        Machine.startMachine(primaryStage);
    } 
}

public class Machine {

    static boolean isFullScreen = false;
    static Rectangle2D screenRect, backRect;
    static Stage backStage;
    static Scene backScene;
    static Pane backPane;

    private Machine() {}

    static public void startMachine(Stage primaryStage) {

        // backscreen
        startScene(primaryStage);

        // This line causes the fill to be lost
        ToggleButton foo = new ToggleButton("hi");
    }

    static private void startScene(Stage primaryStage) {

        // Stage
        backStage = primaryStage;
        backStage.initStyle(StageStyle.UNDECORATED);
        backStage.setFullScreen(isFullScreen);
        screenRect = Screen.getPrimary().getBounds();
        if(!isFullScreen) {
            int w = 1000, h = 500, t = 20;
            backStage.setWidth(w);
            backStage.setHeight(h);
            backStage.setX((screenRect.getWidth() - w)/2);
            backStage.setY(t);
        }
        backRect = new Rectangle2D(backStage.getX(), backStage.getY(),
                backStage.getWidth(), backStage.getHeight());

        // Scene
        backScene = new Scene(backPane = new Pane());
        // backScene.getStylesheets().add(Machine.class.getResource("mainStyle.css").toExternalForm());
        // backScene.getRoot().setStyle("-fx-background-color: #CCFF99;");
        backScene.setFill(new LinearGradient(0,0,1,1, true, CycleMethod.NO_CYCLE,
            new Stop[]{
                    new Stop(0,Color.web("#4977A3")),
                    new Stop(0.5, Color.web("#B0C6DA")),
                    new Stop(1,Color.web("#9CB6CF")), } )); 
        // Logo
        Text logo = new Text("AMT");
        logo.setFill(Color.DEEPSKYBLUE);
        Font font = Font.font("Times New Roman", FontWeight.BOLD, FontPosture.ITALIC, 96);
        logo.setFont(font);
        logo.setX(100);
        logo.setY(150);
        backPane.getChildren().add(logo);
        backStage.setScene(backScene);
        backStage.setFullScreenExitKeyCombination(KeyCombination.NO_MATCH);
        backStage.show();
    }
}

Answer 1

setFill() API建议这可能是样式表效应。默认样式表是在实例化第一个Control时静态安装的。如果样式表是Modena，“默认填充设置为浅灰颜色。”不要使用backScene.setFill()，而是按照here和here的建议尝试backPane.setBackground()。

​

​

// Scene
backPane = new Pane();
backScene = new Scene(backPane);
LinearGradient linearGradient = new LinearGradient(
    0, 0, 1, 1, true, CycleMethod.NO_CYCLE,
    new Stop(0, Color.web("#4977A3")),
    new Stop(0.5, Color.web("#B0C6DA")),
    new Stop(1, Color.web("#9CB6CF")));
backPane.setBackground(new Background(new BackgroundFill(
    linearGradient, CornerRadii.EMPTY, Insets.EMPTY)));

另外，请注意，http://docs.oracle.com/javase/1.5.0/docs/guide/language/varargs.html构造函数参数LinearGradient允许您直接添加Stop实例，而无需创建新的数组。