从JavaFX Label中删除填充/边距 [英] Remove padding/margin from JavaFX Label

问题描述

有没有办法删除JavaFX标签添加的默认空间（填充/边距）？我想摆脱下图中黑线之间显示的空间：

Is there a way to remove the default space (padding/margin) that JavaFX label adds? I want to get rid of the space displayed between the black lines on the image below:

源代码：

public class LabelTest extends Application
{

    @Override
    public void start(final Stage primaryStage)
    {
        final Group root = new Group();
        final Scene scene = new Scene(root, 300, 130, Color.WHITE);

        final GridPane gridpane = new GridPane();
        gridpane.setPadding(new Insets(5));
        gridpane.setHgap(10);
        gridpane.setVgap(10);

        final Label label = new Label("Label");
        label.setStyle("-fx-font-size:44px;-fx-font-weight: bold;-fx-text-fill:#5E34B1;-fx-background-color:#ffc300;");
        GridPane.setHalignment(label, HPos.CENTER);
        gridpane.add(label, 0, 0);

        root.getChildren().add(gridpane);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

推荐答案

你可以通过将 -fx-padding：-10 0 0 0; 添加到样式列表中来实现。

You can achieve that by adding -fx-padding: -10 0 0 0; to the list of your styles.

对于更灵活的解决方案，您可以使用 FontMetrics 信息：

For more flexible solution you can use FontMetrics information:

FontMetrics metrics = Toolkit.getToolkit().getFontLoader().getFontMetrics(label.getFont());
label.setPadding(new Insets(-metrics.getDescent(), 0, 0, 0));

NB：您需要在 scene.show（）。之前图形引擎尚未准备好提供正确的指标。

NB: You need to call that code after scene.show(). Before that graphics engine is not ready to provide correct metrics.

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