Javafx滑块：文本作为刻度标签 [英] Javafx slider: text as tick label

问题描述

我刚开始学习Javafx，到目前为止我真的很喜欢它。但是在我当前的项目中，我需要使用文本作为javafx滑块的刻度标签。我google了很多，但找不到任何帮助。所以例如我想要一个4-5个位置的滑块，它们是坏，好等等而不是1,2,3，...

我知道我可以手动构建自定义UI，并将标签放置在正确的位置，但我需要生成带有自定义文本的滑块，每次都有不同的长度，所以它不起作用。例如，在摆动中可以用哈希表更改标签，所以我的问题是，是否可以在Javafx中进行？

解决方案

以下是使用由于 JavaFX 2.2中的错误。

当你使滑块变小时，一些标签会消失，所以我设置了一个min滑块上的宽度，以便标签保留（另一种解决方案，可能是设置一个新的标签格式化程序，如果滑块尺寸很小，则使用缩写标签）。

你也许有兴趣投票或评论以下功能请求： RT-27863 LabelFormatter isn足以定制Slider ticks 。

I just started to learn Javafx, and I really like it so far. However in my current project I would need to use text as the tick labels for the javafx slider. I googled it a lot, but couldn't find any help. So for example I would like a slider with 4-5 positions, and them being "bad", "good", etc. instead of 1,2,3,...

I know I could build a custom UI manually with labels placed at the correct places, but I need to generate the sliders with custom text, and diofferent length every time, so it wouldn't work. In swing it is possible to change the labels with a hashtable for example, so my question is, is it possible to do it in Javafx?

解决方案

Here is a sample using slider.setLabelFormatter.

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Slider;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
import javafx.util.StringConverter;

public class SlidingScale extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception{
        Slider slider = new Slider(0, 3, 0);
        slider.setMin(0);
        slider.setMax(3);
        slider.setValue(1);
        slider.setMinorTickCount(0);
        slider.setMajorTickUnit(1);
        slider.setSnapToTicks(true);
        slider.setShowTickMarks(true);
        slider.setShowTickLabels(true);

        slider.setLabelFormatter(new StringConverter<Double>() {
            @Override
            public String toString(Double n) {
                if (n < 0.5) return "Novice";
                if (n < 1.5) return "Intermediate";
                if (n < 2.5) return "Advanced";

                return "Expert";
            }

            @Override
            public Double fromString(String s) {
                switch (s) {
                    case "Novice":
                        return 0d;
                    case "Intermediate":
                        return 1d;
                    case "Advanced":
                        return 2d;
                    case "Expert":
                        return 3d;

                    default:
                        return 3d;
                }
            }
        });

        slider.setMinWidth(380);

        HBox layout = new HBox(slider);
        layout.setPadding(new Insets(30));

        primaryStage.setScene(new Scene(layout));
        primaryStage.show();
    }


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

The sample above only works in Java 8 due to a bug in JavaFX 2.2.

Some of the labels disappear as you make the the slider smaller, so I set a min width on the slider so that the labels remain (an alternate solution, might be to set a new label formatter with abbreviated labels used if the slider is sized small).

You might also be interested in voting for or commenting on the following feature request: RT-27863 A LabelFormatter isn't enough to customize Slider ticks.

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