如何调整包含 svg 图像的按钮的大小

Question

我想在按钮内放置一个 svg 图像，然后我希望能够将按钮调整为任何大小。

首先，这是我在按钮内加载和放置 svg 图像的方式：

SVGPath svg = new SVGPath();
        svg.setContent("M87.5,50.002C87.5,29.293,70.712,12.5,50,12.5c-20.712,0-37.5,16.793-37.5,37.502C12.5,70.712,29.288,87.5,50,87.5
        c6.668,0,12.918-1.756,18.342-4.809c0.61-0.22,1.049-0.799,1.049-1.486c0-0.622-0.361-1.153-0.882-1.413l0.003-0.004l-6.529-4.002
        L61.98,75.79c-0.274-0.227-0.621-0.369-1.005-0.369c-0.238,0-0.461,0.056-0.663,0.149l-0.014-0.012
        C57.115,76.847,53.64,77.561,50,77.561c-15.199,0-27.56-12.362-27.56-27.559c0-15.195,12.362-27.562,27.56-27.562
        c14.322,0,26.121,10.984,27.434,24.967C77.428,57.419,73.059,63,69.631,63c-1.847,0-3.254-1.23-3.254-3.957
        c0-0.527,0.176-1.672,0.264-2.111l4.163-19.918l-0.018,0c0.012-0.071,0.042-0.136,0.042-0.21c0-0.734-0.596-1.33-1.33-1.33h-7.23
        c-0.657,0-1.178,0.485-1.286,1.112l-0.025-0.001l-0.737,3.549c-1.847-3.342-5.629-5.893-10.994-5.893
        c-10.202,0-19.877,9.764-19.877,21.549c0,8.531,5.101,14.775,13.632,14.775c4.75,0,9.587-2.727,12.665-7.035l0.088,0.527
        c0.615,3.342,9.843,7.576,15.121,7.576c7.651,0,16.617-5.156,16.617-19.932l-0.022-0.009C87.477,51.13,87.5,50.569,87.5,50.002z
         M56.615,56.844c-1.935,2.727-5.101,5.805-9.763,5.805c-4.486,0-7.212-3.166-7.212-7.738c0-6.422,5.013-12.754,12.049-12.754
        c3.958,0,6.245,2.551,7.124,4.486L56.615,56.844z");

Button button = new Button();
        button.setGraphic(svg);

我尝试将 SVGPath 放在 Group 对象中，然后我缩放了该 Group，如下所示：

Group graphics = new Group();
graphics.getChildren().add(svg);
graphics.getTransforms().add(new Scale(0.2, 0.2, 0 , 10));

Button button = new Button();
button.setGraphic(graphics);

这确实改变了 svg 图像的大小。问题是按钮的大小不会相应地改变。它的大小与图像从未重新缩放过的大小相同。我是否设置了按钮的最大大小并不重要。我只能让按钮变大，但不能变小。

在 JavaFx 中使用 SVG 图像的文档似乎非常有限，所以如果有人能帮助我，我将不胜感激。

更新： @ItachiUchiha 指出我可以使用setScaleX(..) andsetScaleY(..)重新缩放按钮，并且里面的 svg 图像将随之重新缩放。但是，这样做似乎不会改变按钮的大小属性。这意味着包含按钮的窗格仍将占据与按钮未重新缩放相同的空间。在窗格上设置最大尺寸也无济于事。此外，setScaleY 和 X 方法重新缩放所有按钮，包括按钮的边框。这为按钮提供了不同于包含纯文本的按钮的外观。我的窗格将包含带有 svg 内容的按钮和带有纯文本内容的按钮，并且除了它们的内容外，它们看起来都一样。

更新 2： @ItachiUchiha 编辑后的回复使一切变得清晰。标记为答案。

Answer 1

SVG 图像可以自行调整大小并适合其容器。您可以重新调整按钮大小，SVG 图像将适合其边界。

Button button = new Button();
button.setGraphic(svg);
// Re-size the button
button.setScaleX(0.5);
button.setScaleY(0.5);

编辑- 根据父级调整按钮大小。

如果您想根据父级重新调整按钮大小并根据它缩放图像。您可以将图像的 scale 属性绑定到 Button 的高度和宽度。每当 Parent 的大小发生变化时，也要更改按钮的 prefSize。

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.shape.SVGPath;
import javafx.stage.Stage;

public class Main extends Application{

    private final int MIN_BUTTON_SIZE = 10;

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        HBox root = new HBox();
        root.setAlignment(Pos.CENTER);
        SVGPath svg = new SVGPath();
        svg.setContent("M87.5,50.002C87.5,29.293,70.712,12.5,50,12.5c-20.712,0-37.5,16.793-37.5,37.502C12.5,70.712,29.288,87.5,50,87.5" +
                "c6.668,0,12.918-1.756,18.342-4.809c0.61-0.22,1.049-0.799,1.049-1.486c0-0.622-0.361-1.153-0.882-1.413l0.003-0.004l-6.529-4.002" +
        "L61.98,75.79c-0.274-0.227-0.621-0.369-1.005-0.369c-0.238,0-0.461,0.056-0.663,0.149l-0.014-0.012" +
        "C57.115,76.847,53.64,77.561,50,77.561c-15.199,0-27.56-12.362-27.56-27.559c0-15.195,12.362-27.562,27.56-27.562" +
        "c14.322,0,26.121,10.984,27.434,24.967C77.428,57.419,73.059,63,69.631,63c-1.847,0-3.254-1.23-3.254-3.957" +
        "c0-0.527,0.176-1.672,0.264-2.111l4.163-19.918l-0.018,0c0.012-0.071,0.042-0.136,0.042-0.21c0-0.734-0.596-1.33-1.33-1.33h-7.23" +
        "c-0.657,0-1.178,0.485-1.286,1.112l-0.025-0.001l-0.737,3.549c-1.847-3.342-5.629-5.893-10.994-5.893" +
        "c-10.202,0-19.877,9.764-19.877,21.549c0,8.531,5.101,14.775,13.632,14.775c4.75,0,9.587-2.727,12.665-7.035l0.088,0.527" +
        "c0.615,3.342,9.843,7.576,15.121,7.576c7.651,0,16.617-5.156,16.617-19.932l-0.022-0.009C87.477,51.13,87.5,50.569,87.5,50.002z" +
        "M56.615,56.844c-1.935,2.727-5.101,5.805-9.763,5.805c-4.486,0-7.212-3.166-7.212-7.738c0-6.422,5.013-12.754,12.049-12.754" +
        "c3.958,0,6.245,2.551,7.124,4.486L56.615,56.844z");

        Button buttonWithGraphics = new Button();
        buttonWithGraphics.setGraphic(svg);

        // Bind the Image scale property to the buttons size
        svg.scaleXProperty().bind(buttonWithGraphics.widthProperty().divide(100));
        svg.scaleYProperty().bind(buttonWithGraphics.heightProperty().divide(100));

        // Declare a minimum size for the button
        buttonWithGraphics.setMinSize(MIN_BUTTON_SIZE, MIN_BUTTON_SIZE);

        root.getChildren().addAll(buttonWithGraphics);
        root.layoutBoundsProperty().addListener((observableValue, oldBounds, newBounds) -> {
                double size = Math.max(MIN_BUTTON_SIZE, Math.min(newBounds.getWidth(), newBounds.getHeight()));
                buttonWithGraphics.setPrefSize(size, size);
            }
        );

        Scene scene = new Scene(root);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

该中心的形象是默认大小，所以这个作品上减少以及增加按钮的大小。

注意-您可以计算和使用按钮的高度和宽度的不同值。