Spinner微调器

基本配置

设置可编辑spinner.setEditable(true);
设置箭头样式spinner.getStyleClass().add(Spinner.STYLE_CLASS_ARROWS_ON_LEFT_HORIZONTAL);

值改变监听事件

spinner.valueProperty().addListener((observable, oldValue, newValue) -> {  
    System.out.println(newValue);  
});

使用方式

通过构造器传参创建

// 最小值，最大值，初始值，步长
Spinner<Integer> spinner = new Spinner<Integer>(0,10,5,2);

通过传入可观察列表创建

// 创建可观察列表
ObservableList<String> list = FXCollections.observableArrayList();  
list.addAll("A","B","C","D","E");  
Spinner<String> spinner = new Spinner<>(list);

使用内置的SpinnerValueFactory

// 创建学生类的可观察列表
Student student1 = new Student("张三", 18);  
Student student2 = new Student("李四", 19);  
Student student3 = new Student("王五", 20);  
ObservableList<Student> list = FXCollections.observableArrayList();  
list.addAll(student1, student2, student3);
// 创建内置的SpinnerValueFactory
Spinner<Student> spinner = new Spinner<>();  
SpinnerValueFactory.ListSpinnerValueFactory<Student> listSpinnerValueFactory = new SpinnerValueFactory.ListSpinnerValueFactory<>(list);  
listSpinnerValueFactory.setConverter(new StringConverter<Student>() {  
    @Override  
    public String toString(Student object) {  
        if (object == null) {  
            return null;  
        }  
        return object.getName() + ":" + object.getAge();  
    }  
    @Override  
    public Student fromString(String string) {  
        return null;  
    }  
});  
spinner.setValueFactory(listSpinnerValueFactory);

使用自定义的SpinnerValueFactory

自定义SpinnerValueFactory

class SVF extends SpinnerValueFactory<Student> {  

    private int index = -1;  
    private ObservableList<Student> list;  

    public SVF(ObservableList<Student> list) {  
        this.list = list;  
    }  

    @Override  
    public void decrement(int steps) {  
        System.out.println("decrement = " + steps);  
        index -= steps;  
        // 循环效果  
        if (index <= -1) {  
            index = list.size() - 1;  
        }  
        this.setValue(list.get(index));  
    }  

    @Override  
    public void increment(int steps) {  
        System.out.println("increment = " + steps);  
        index += steps;  
        // 循环效果  
        if (index >= list.size()) {  
            index = 0;  
        }  
        this.setValue(list.get(index));  
    }  
}

使用自定义的SpinnerValueFactory

// 使用自定义的SpinnerValueFactory  
Spinner<Student> spinner = new Spinner<>(list);  
spinner.setEditable(true);  
spinner.setPrefWidth(400);  
SVF svf = new SVF(list);  
svf.setConverter(new StringConverter<Student>() {  
    // 修改展示的数据  
    @Override  
    public String toString(Student object) {  
        if (object == null) {  
            return null;  
        }  
        return object.getName() + ":" + object.getAge();  
    }  
    // 处理输入框传入的数据  
    @Override  
    public Student fromString(String string) {  
        if (string.equals("")) {  
            return null;  
        }  
        String[] strings = string.split("[:]");  
        Student student;  
        if (strings.length < 2) {  
            student = new Student(strings[0], 29);  
        } else {  
            student = new Student(strings[0], Integer.parseInt(strings[1])  
		}  
		int index = list.indexOf(student);  
		if (index == -1) {  
            list.add(student);  
        }  
        return student;  
    }  
});  
spinner.setValueFactory(svf);  
// 设置默认值，此设置只有在svf.setConverter和spinner.setValueFactory语句后才内调用其toString方法  
svf.setValue(student1);  
spinner.decrement(-3);  
spinner.increment(2);

# Spinner微调器

# 基本配置

# 使用方式

Spinner微调器

基本配置

使用方式