JSpinner 时间限制

Question

我正在尝试创建一个有小时和分钟的微调器。分钟部分只需增加 10 分钟，时间必须从当前时间到结束时间。我还需要最小值（以前的当前时间）来更新到当前时间。

我尝试过使用它，但我无法让它工作。

JSpinner spinner1 = new javax.swing.JSpinner();
    SpinnerDateModel spinnermodel = new SpinnerDateModel();
    spinnermodel.setCalendarField(Calendar.MINUTE);
    spinner1.setModel(spinnermodel);
    spinner1.setEditor(new JSpinner.DateEditor(spinner1, "hh:mm"));

SpinnerModel model = new SpinnerDateModel(currentDate, currentDate, latestDate, Calendar.MINUTE * 10 ?);

Answer 1

SpinnerDateModel 只是使用 1 来增加您要更改的字段。

我扩展了SpinnerDateModel，为模型添加了一个加法属性来控制增量值而不是硬编码为1：

import java.util.*;
import javax.swing.*;

public class MySpinnerDateModel extends SpinnerDateModel
{
    private int increment = 1;

    public MySpinnerDateModel(Date value, Comparable start, Comparable end, int calendarField)
    {
        super(value, start, end, calendarField);
    }

    public MySpinnerDateModel()
    {
        this(new Date(), null, null, Calendar.DAY_OF_MONTH);
    }

    public void setIncrement(int increment)
    {
        this.increment = increment;
    }

    public int getIncrement()
    {
        return increment;
    }

    @Override
    public Object getNextValue()
    {
        Calendar cal = Calendar.getInstance();
        Date value = (Date)getValue();
        cal.setTime(value);
        cal.add(getCalendarField(), increment);
        Date next = cal.getTime();
        Comparable end = getEnd();

        return ((end == null) || (end.compareTo(next) >= 0)) ? next : null;
    }

    @Override
    public Object getPreviousValue()
    {
        Calendar cal = Calendar.getInstance();
        Date value = (Date)getValue();
        cal.setTime(value);
        cal.add(getCalendarField(), -increment);
        Date prev = cal.getTime();
        Comparable start = getStart();

        return ((start == null) || (start.compareTo(prev) <= 0)) ? prev : null;
    }
}

您应该能够像以前一样使用该模型，但需要添加一条语句：

MySpinnerDateModel model = new MySpinnerDateModel(currentDate, currentDate, latestDate, Calendar.MINUTE); 
model.setIncrement( 10 );

Answer 2

您可以扩展 SpinnerDateModel 来指定行为。下面是一个示例，其中 getNextValue 和 getPreviousValue 被覆盖以返回 +/- 10 分钟的值：

    Date now = new Date();
    Date start = now;
    final long tenMinutesInMillis = 1000 * 60 * 10;
    Date end = new Date(now.getTime() + tenMinutesInMillis * 60);
    SpinnerModel model = new SpinnerDateModel(now, start, end, Calendar.MINUTE){
        @Override
        public Object getNextValue(){
            Date newDate = new Date(getDate().getTime() + tenMinutesInMillis);
            Date endDate = (Date)getEnd();
            return newDate.getTime() > endDate.getTime() ? endDate : newDate;
        }

        @Override
        public Object getPreviousValue(){
            Date newDate = new Date(getDate().getTime() - tenMinutesInMillis);
            Date startDate = (Date)getStart();
            return newDate.getTime() < startDate.getTime() ? startDate : newDate;
        }
    };