Question

这是该question的延续。

我试图用AnchorPane覆盖图表图，我称它为缓冲区。

这是一个代码示例。

package launcher;

import javafx.application.Application;
import javafx.geometry.Bounds;
import javafx.geometry.Side;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.layout.AnchorPane;
import javafx.stage.Stage;

public class Main extends Application {

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

        NumberAxis numberAxis = new NumberAxis();
        LineChart<Number, Number> chart = new LineChart<>(numberAxis, new NumberAxis());
        chart.getYAxis().setSide(Side.RIGHT);

        AnchorPane buffer = new AnchorPane();
        buffer.setStyle("-fx-background-color: gray;" +
                "-fx-opacity: 0.5");

        AnchorPane anchorPane = new AnchorPane();
        AnchorPane.setTopAnchor(chart, 0.0);
        AnchorPane.setRightAnchor(chart, 0.0);
        AnchorPane.setBottomAnchor(chart, 0.0);
        AnchorPane.setLeftAnchor(chart, 0.0);

        anchorPane.getChildren().addAll(chart, buffer);

        Scene scene = new Scene(anchorPane);
        primaryStage.setScene(scene);
        primaryStage.setMaximized(true);

        primaryStage.show();

        resetBuffer(chart, buffer, anchorPane);

        anchorPane.widthProperty().addListener((observable, oldValue, newValue) -> {

            resetBuffer(chart, buffer, anchorPane);
        });
    }

    private void resetBuffer(LineChart<Number, Number> chart, AnchorPane buffer,
                             AnchorPane anchorPane) {
        Node chartPlot = chart.lookup(".chart-plot-background");

        Bounds bounds = anchorPane.sceneToLocal(
                chartPlot.localToScene(chartPlot.getBoundsInLocal()));

        buffer.setPrefWidth(bounds.getWidth());
        buffer.setPrefHeight(bounds.getHeight());

        AnchorPane.setLeftAnchor(buffer, bounds.getMinX());
        AnchorPane.setTopAnchor(buffer, bounds.getMinY());
    }
}

一切正常，直到我调整舞台大小为止。调整大小时，AnchorPane（缓冲区）没有正确覆盖图表。即它不适合大小。

如何修复或以正确的方式进行？

Answer 1

希望这可以解决它：

第一个解决方案：

    double sideSizeWidth = (anchorPane.getWidth()-bounds.getWidth());
    double sideSizeHeight= (anchorPane.getHeight()-bounds.getHeight());

    buffer.prefWidthProperty().bind(Bindings.add(
            chart.widthProperty(),
            -sideSizeWidth
    ));
    buffer.prefHeightProperty().bind(Bindings.add(
            chart.heightProperty(),
            -sideSizeHeight
    ));

（它必须位于resetBuffer中，并且在课程开始时primaryStage.show()之后只需调用一次）

第二种解决方法：

 scene.widthProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
                double dif =oldValue.doubleValue()-newValue.doubleValue();
                buffer.setPrefWidth(buffer.getWidth()-(dif));
            }
        });
        scene.heightProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
                double dif =oldValue.doubleValue()-newValue.doubleValue();
                buffer.setPrefHeight(buffer.getHeight()-(dif));
            }
        });

它基于宽度和高度在轴标签和图例中是永久不变的事实，因此我们只需要计算scene大小的差异，然后应用于buffer。

所有代码：

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        NumberAxis numberAxis = new NumberAxis();
        LineChart<Number, Number> chart = new LineChart<>(numberAxis, new NumberAxis());
        chart.getYAxis().setSide(Side.RIGHT);

        AnchorPane buffer = new AnchorPane();
        buffer.setStyle("-fx-background-color: gray;" +
                "-fx-opacity: 0.5");

        AnchorPane anchorPane = new AnchorPane();
        AnchorPane.setTopAnchor(chart, 0.0);
        AnchorPane.setRightAnchor(chart, 0.0);
        AnchorPane.setBottomAnchor(chart, 0.0);
        AnchorPane.setLeftAnchor(chart, 0.0);

        anchorPane.getChildren().addAll(chart, buffer);

        Scene scene = new Scene(anchorPane);
        primaryStage.setScene(scene);
        primaryStage.setMaximized(true);

        primaryStage.show();

        resetBuffer(chart, buffer, anchorPane,scene);



    }

    private void resetBuffer(LineChart<Number, Number> chart, AnchorPane buffer,
                             AnchorPane anchorPane,Scene scene) {
        Node chartPlot = chart.lookup(".chart-plot-background");

        Bounds bounds = anchorPane.sceneToLocal(
                chartPlot.localToScene(chartPlot.getBoundsInLocal()));

        buffer.setPrefWidth(bounds.getWidth());
        buffer.setPrefHeight(bounds.getHeight());

        AnchorPane.setLeftAnchor(buffer, bounds.getMinX());
        AnchorPane.setTopAnchor(buffer, bounds.getMinY());

        scene.widthProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
                double dif =oldValue.doubleValue()-newValue.doubleValue();
                buffer.setPrefWidth(buffer.getWidth()-(dif));
            }
        });
        scene.heightProperty().addListener(new ChangeListener<Number>() {
            @Override
            public void changed(ObservableValue<? extends Number> observable, Number oldValue, Number newValue) {
                double dif =oldValue.doubleValue()-newValue.doubleValue();
                buffer.setPrefHeight(buffer.getHeight()-(dif));
            }
        });

    }
}

Answer 2

更新：不是将监听器添加到widthProperty中，而是将监听器添加到prefWidthProperty中，例如：

anchorPane.prefWidthProperty().addListener((observable, oldValue, newValue) -> {

            resetBuffer(chart, buffer, anchorPane);
        });

OLD

您可以尝试将缓冲区prefWidth和prefHeight与anchorPane的prefWidth和prefHeight绑定例如

buffer.prefWidthProperty().bind(anchorPane.widthProperty());
buffer.prefHeightProperty().bind(anchorPane.heightProperty());

它将绑定buffers的宽度和高度与anchorPane的宽度和高度，因此，每当anchorPane的大小改变时，缓冲区的大小也会改变。您也不需要调整大小缓冲区，只需在您的类中使用此代码

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

        NumberAxis numberAxis = new NumberAxis();
        LineChart<Number, Number> chart = new LineChart<>(numberAxis, new NumberAxis());
        chart.getYAxis().setSide(Side.RIGHT);

        AnchorPane buffer = new AnchorPane();
        buffer.setStyle("-fx-background-color: gray;"
                + "-fx-opacity: 0.5");

        AnchorPane anchorPane = new AnchorPane();
        AnchorPane.setTopAnchor(chart, 0.0);
        AnchorPane.setRightAnchor(chart, 0.0);
        AnchorPane.setBottomAnchor(chart, 0.0);
        AnchorPane.setLeftAnchor(chart, 0.0);

        anchorPane.getChildren().addAll(chart, buffer);

        Scene scene = new Scene(anchorPane);
        primaryStage.setScene(scene);
        primaryStage.setMaximized(true);

        primaryStage.show();

        buffer.prefWidthProperty().bind(anchorPane.widthProperty());
        buffer.prefHeightProperty().bind(anchorPane.heightProperty());

    }

Answer 3

只需将对resetBuffer的呼叫包装到Platform.runLater中，如下所示：

anchorPane.widthProperty().addListener((observable, oldValue, newValue) -> {
    Platform.runLater(() -> {
        resetBuffer(chart, buffer, anchorPane);
    });
});

这样，您将确保在布局图表之后执行代码

如何在JavaFX 8中使用AnchorPane覆盖图表图？

3 个答案: