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如何在JavaFX中创建自定义折线图控件?

javafx-8 javafx java

igorludi · 技术社区 · 6 年前

我在JavaFX项目中有一个自定义的LineChartWithMarkers控件。我在Java(FX)编程中暂停了两年,发现Java 10中不再存在LineChartBuilder。我能找到一些文档说它在版本8中已被弃用,但没有找到如何替换它。

如何修复代码以使用Java 10?

这就是我所拥有的:

public class LineChartWithMarkersBuilder extends LineChartBuilder {
    private Axis<Number> xAxis ;
    private Axis<Number> yAxis ;        
    private ObservableList<Series<Number,Number>> data ;

    public static LineChartWithMarkersBuilder create() {
        return new LineChartWithMarkersBuilder();
    }

    public LineChartWithMarkersBuilder xAxis(Axis<Number> xAxis) {
        this.xAxis = xAxis ;
        return this ;
    }

    public LineChartWithMarkersBuilder yAxis(Axis<Number> yAxis) {
        this.yAxis = yAxis ;
        return this ;
    }


    public LineChartWithMarkers<Number, Number> build() {
        xAxis = new NumberAxis();
        yAxis = new NumberAxis();
        return new LineChartWithMarkers<Number, Number>( xAxis, yAxis);

    }
}

以及带有标记的自定义折线图:

public class LineChartWithMarkers<X extends Number, Y extends Number> extends LineChart<X, Y>  {

    private ObservableList<Data<Number, Number>> verticalMarkers;


    public LineChartWithMarkers(Axis<X> xAxis, Axis<Y> yAxis) {
        super(xAxis, yAxis);
        this.setCreateSymbols(false);
        verticalMarkers = FXCollections.observableArrayList(data -> new Observable[] {data.XValueProperty()});
        verticalMarkers.addListener((InvalidationListener)observable -> layoutPlotChildren());
    }
    (...)
}

我用的是。fxml如下:

...
                <LineChartWithMarkers fx:id="chartFit" createSymbols="false" layoutX="14.0" layoutY="54.0" prefHeight="499.0" prefWidth="987.0" AnchorPane.bottomAnchor="162.0" AnchorPane.leftAnchor="14.0" AnchorPane.rightAnchor="5.0" AnchorPane.topAnchor="54.0">
                <xAxis>
                    <NumberAxis side="BOTTOM" />
                </xAxis>
                <yAxis>
                    <NumberAxis side="LEFT" />
                </yAxis>
            </LineChartWithMarkers>
...

1 回复 | 直到 6 年前

James_D 6 年前

所有JavaFX构建器类在Java 8中都被弃用,在Java 9中被删除。只需完全删除builder类。允许 FXMLLoader top实例化没有无参数构造函数的类,使用 @NamedArg 构造函数参数注释:

public class LineChartWithMarkers<X extends Number, Y extends Number> extends LineChart<X, Y>  {

    private ObservableList<Data<Number, Number>> verticalMarkers;


    public LineChartWithMarkers(
            @NamedArg("xAxis") Axis<X> xAxis, 
            @NamedArg("yAxis") Axis<Y> yAxis) {
        super(xAxis, yAxis);
        this.setCreateSymbols(false);
        verticalMarkers = FXCollections.observableArrayList(data -> new Observable[] {data.XValueProperty()});
        verticalMarkers.addListener((InvalidationListener)observable -> layoutPlotChildren());
    }
    (...)
}

完整讨论 @名称达格 注释可在中找到 What is the purpose of @NamedArg annotation in javaFX 8?