JavaFX Slider

小灰灰 2023-10-15 14:22 52阅读 0赞

The *JavaFX Slider* control provides a way for the user to select a value within a given interval by sliding a handle to the desired point representing the desired value. The *JavaFX* *Slider* is represented by the JavaFX class `javafx.scene.control.Slider`. Here is a screenshot of how a JavaFX `Slider` looks:

![af22060c2ce544e88ed86f06eeef5b41.png][]

### JavaFX Slider Example ###

Here is a full JavaFX `Slider` code example:

import javafx.application.Application;
    import javafx.scene.Scene;
    import javafx.scene.control.Slider;
    import javafx.scene.layout.VBox;
    import javafx.stage.Stage;
    
    public class SliderExample extends Application {
        public static void main(String[] args) {
            launch(args);
        }
    
        @Override
        public void start(Stage primaryStage) {
            primaryStage.setTitle("JavaFX App");
    
            Slider slider = new Slider(0, 100, 0);
    
            VBox vBox = new VBox(slider);
            Scene scene = new Scene(vBox, 960, 600);
    
            primaryStage.setScene(scene);
            primaryStage.show();
        }
    
    }

### Create a Slider ###

To use a JavaFX `Slider` you must first create an instance of the `Slider` class. Here is an example of creating a JavaFX `Slider` instance:

Slider slider = new Slider(0, 100, 0);

The `Slider` constructor used above takes three parameters: The min value, the max value and the initial value. The min value is the value sliding the handle all the way to the left represents. This is the beginning of the interval the user can select a value in. The max value is the value sliding the handle all the way to the right represents. This the end of the interval the user can select a value in. The initial value is the value that the handle should be located at, when presented to the user at first.

### Reading Slider Value ###

You can read the value of a `Slider` as selected by the user via the `getValue()` method. Here is an example of reading the selected value of a JavaFX `Slider`:

double value = slider.getValue();

### Major Tick Unit ###

You can set the major tick unit of a JavaFX `Slider` control. The major tick unit is how many units the value changes every time the user moves the handle of the `Slider` one tick. Here is an example that sets the major tick unit of a JavaFX `Slider` to 8:

Slider slider = new Slider(0, 100, 0);
    
    slider.setMajorTickUnit(8.0);

This `Slider` will have its value change with 8.0 up or down whenever the handle in the `Slider` is moved.

### Minor Tick Count ###

You can set the minor tick count of a JavaFX `Slider` via the `setMinorTickCount()` method. The minor tick count specifies how many minor ticks there are between two of the major ticks. Here is an example that sets the minor tick count to 2:

Slider slider = new Slider(0, 100, 0);
    slider.setMajorTickUnit(8.0);
    slider.setMinorTickCount(3);

The `Slider` configured here has 8.0 value units between each major tick, and in between each of these major ticks it has 3 minor ticks.

### Snap Handle to Ticks ###

You can make the handle of the JavaFX `Slider` snap to the ticks using the `Slider` `setSnapToTicks()` method, passing a parameter value of `true` it. Here is an example of making the JavaFX `Slider` snap its handle to the ticks:

slider.setSnapToTicks(true);

### Show Tick Marks ###

You can make the *JavaFX* *Slider* show marks for the ticks when it renders the slider. You do so using its `setShowTickMarks()` method. Here is an example of making a JavaFX `Slider` show tick marks:

slider.setShowTickMarks(true);

Here is a screenshot of how a JavaFX `Slider` looks with tick marks shown:

![c1b6de1184bc405fa614195ea348ac80.png][]

### Show Tick Labels ###

You can make the JavaFX `Slider` show tick labels for the ticks when it renders the slider. You do so using its `setShowTickLabels()` method. Here is an example of making a JavaFX `Slider` show tick labels:

slider.setShowTickLabels(true);

Here is a screenshot of how a JavaFX `Slider` looks with tick marks and labels shown:

![3611407cf73b4f11979dfa932362789c.png][]

[af22060c2ce544e88ed86f06eeef5b41.png]: https://img-blog.csdnimg.cn/af22060c2ce544e88ed86f06eeef5b41.png
[c1b6de1184bc405fa614195ea348ac80.png]: https://img-blog.csdnimg.cn/c1b6de1184bc405fa614195ea348ac80.png
[3611407cf73b4f11979dfa932362789c.png]: https://img-blog.csdnimg.cn/3611407cf73b4f11979dfa932362789c.png