mousemoved事件中的Javafx滑块值 [英] Javafx slider value at mousemoved event

问题描述

我正在制作媒体播放器，并且当我将鼠标悬停在滑块栏上时，我正试图将播放滑块值设置在光标位置。为了做到这一点，我使用了以下内容：

I am making a media player and am trying to get the playback slider value at the cursor position when hovering over the slider bar. In an attempt to do this, i have used the following:

    timeSlider.addEventFilter(MouseEvent.MOUSE_MOVED, event -> System.out.println("hovering"));

只要鼠标在滑块上改变位置，就会打印悬停。谁能告诉我如何在当前光标位置获取滑块的值？我只能弄清楚如何在拇指位置获取值。

which prints "hovering" whenever the mouse changes position over the slider. Can anyone please show me how to get the value of the slider at the current cursor position? I can only figure out how to get the value at the thumb position.

提前致谢。

推荐答案

如果你在滑块下显示轴，这里有一点（可能不止一点）黑客。它依赖于通过其css类查找轴，将鼠标坐标转换为相对于轴的坐标，然后使用来自 ValueAxis 的API转换为值：

Here is a bit (maybe more than a bit) of a hack that works if you are showing the axis under the slider. It relies on looking up the axis via its css class, converting the mouse coordinates to coordinates relative to the axis, and then using API from ValueAxis to convert to the value:

import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Scene;
import javafx.scene.chart.NumberAxis;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.layout.StackPane;
import javafx.stage.Popup;
import javafx.stage.Stage;

public class TooltipOnSlider extends Application {

    @Override
    public void start(Stage primaryStage) {
        Slider slider = new Slider(5, 25, 15);
        slider.setShowTickMarks(true);
        slider.setShowTickLabels(true);
        slider.setMajorTickUnit(5);

        Label label = new Label();
        Popup popup = new Popup();
        popup.getContent().add(label);

        double offset = 10 ;

        slider.setOnMouseMoved(e -> {
            NumberAxis axis = (NumberAxis) slider.lookup(".axis");
            Point2D locationInAxis = axis.sceneToLocal(e.getSceneX(), e.getSceneY());
            double mouseX = locationInAxis.getX() ;
            double value = axis.getValueForDisplay(mouseX).doubleValue() ;
            if (value >= slider.getMin() && value <= slider.getMax()) {
                label.setText(String.format("Value: %.1f", value));
            } else {
                label.setText("Value: ---");
            }
            popup.setAnchorX(e.getScreenX());
            popup.setAnchorY(e.getScreenY() + offset);
        });

        slider.setOnMouseEntered(e -> popup.show(slider, e.getScreenX(), e.getScreenY() + offset));
        slider.setOnMouseExited(e -> popup.hide());

        StackPane root = new StackPane(slider);
        primaryStage.setScene(new Scene(root, 350, 80));
        primaryStage.show();

    }

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

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