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javax.swing

Class SpinnerDateModel

Inhaltsverzeichnis
  • All Implemented Interfaces:
    Serializable, SpinnerModel

    public class SpinnerDateModel
extends AbstractSpinnerModel
implements Serializable
    A SpinnerModel for sequences of Dates. The upper and lower bounds of the sequence are defined by properties called start and end and the size of the increase or decrease computed by the nextValue and previousValue methods is defined by a property called calendarField. The start and end properties can be null to indicate that the sequence has no lower or upper limit.

    The value of the calendarField property must be one of the java.util.Calendar constants that specify a field within a Calendar. The getNextValue and getPreviousValue methods change the date forward or backwards by this amount. For example, if calendarField is Calendar.DAY_OF_WEEK, then nextValue produces a Date that's 24 hours after the current value, and previousValue produces a Date that's 24 hours earlier.

    The legal values for calendarField are:

    • Calendar.ERA
    • Calendar.YEAR
    • Calendar.MONTH
    • Calendar.WEEK_OF_YEAR
    • Calendar.WEEK_OF_MONTH
    • Calendar.DAY_OF_MONTH
    • Calendar.DAY_OF_YEAR
    • Calendar.DAY_OF_WEEK
    • Calendar.DAY_OF_WEEK_IN_MONTH
    • Calendar.AM_PM
    • Calendar.HOUR
    • Calendar.HOUR_OF_DAY
    • Calendar.MINUTE
    • Calendar.SECOND
    • Calendar.MILLISECOND
    However some UIs may set the calendarField before commiting the edit to spin the field under the cursor. If you only want one field to spin you can subclass and ignore the setCalendarField calls.

    This model inherits a ChangeListener. The ChangeListeners are notified whenever the models value, calendarField, start, or end properties changes.

    Since:
    1.4
    See Also:
    JSpinner, SpinnerModel, AbstractSpinnerModel, SpinnerListModel, SpinnerNumberModel, Calendar.add(int, int)

    • Constructor Detail

      • SpinnerDateModel

        public SpinnerDateModel(Date value,
                Comparable start,
                Comparable end,
                int calendarField)
        Creates a SpinnerDateModel that represents a sequence of dates between start and end. The nextValue and previousValue methods compute elements of the sequence by advancing or reversing the current date value by the calendarField time unit. For a precise description of what it means to increment or decrement a Calendar field, see the add method in java.util.Calendar.

        The start and end parameters can be null to indicate that the range doesn't have an upper or lower bound. If value or calendarField is null, or if both start and end are specified and mininum > maximum then an IllegalArgumentException is thrown. Similarly if (minimum <= value <= maximum) is false, an IllegalArgumentException is thrown.

        Parameters:
        value - the current (non null) value of the model
        start - the first date in the sequence or null
        end - the last date in the sequence or null
        calendarField - one of
        • Calendar.ERA
        • Calendar.YEAR
        • Calendar.MONTH
        • Calendar.WEEK_OF_YEAR
        • Calendar.WEEK_OF_MONTH
        • Calendar.DAY_OF_MONTH
        • Calendar.DAY_OF_YEAR
        • Calendar.DAY_OF_WEEK
        • Calendar.DAY_OF_WEEK_IN_MONTH
        • Calendar.AM_PM
        • Calendar.HOUR
        • Calendar.HOUR_OF_DAY
        • Calendar.MINUTE
        • Calendar.SECOND
        • Calendar.MILLISECOND
        Throws:
        IllegalArgumentException - if value or calendarField are null, if calendarField isn't valid, or if the following expression is false: (start <= value <= end).
        See Also:
        Calendar.add(int, int), setValue(java.lang.Object), setStart(java.lang.Comparable), setEnd(java.lang.Comparable), setCalendarField(int)

      • SpinnerDateModel

        public SpinnerDateModel()
        Constructs a SpinnerDateModel whose initial value is the current date, calendarField is equal to Calendar.DAY_OF_MONTH, and for which there are no start/end limits.

    • Method Detail

      • setStart

        public void setStart(Comparable start)
        Changes the lower limit for Dates in this sequence. If start is null, then there is no lower limit. No bounds checking is done here: the new start value may invalidate the (start <= value <= end) invariant enforced by the constructors. This is to simplify updating the model. Naturally one should ensure that the invariant is true before calling the nextValue, previousValue, or setValue methods.

        Typically this property is a Date however it's possible to use a Comparable with a compareTo method for Dates. For example start might be an instance of a class like this: 

         MyStartDate implements Comparable {
     long t = 12345;
     public int compareTo(Date d) {
            return (t < d.getTime() ? -1 : (t == d.getTime() ? 0 : 1));
     }
     public int compareTo(Object o) {
            return compareTo((Date)o);
     }
 }
        Note that the above example will throw a ClassCastException if the Object passed to compareTo(Object) is not a Date.

        This method fires a ChangeEvent if the start has changed.

        Parameters:
        start - defines the first date in the sequence
        See Also:
        getStart(), setEnd(java.lang.Comparable), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)

      • setEnd

        public void setEnd(Comparable end)
        Changes the upper limit for Dates in this sequence. If start is null, then there is no upper limit. No bounds checking is done here: the new start value may invalidate the (start <= value <= end) invariant enforced by the constructors. This is to simplify updating the model. Naturally, one should ensure that the invariant is true before calling the nextValue, previousValue, or setValue methods.

        Typically this property is a Date however it's possible to use Comparable with a compareTo method for Dates. See setStart for an example.

        This method fires a ChangeEvent if the end has changed.

        Parameters:
        end - defines the last date in the sequence
        See Also:
        getEnd(), setStart(java.lang.Comparable), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)

      • setCalendarField

        public void setCalendarField(int calendarField)
        Changes the size of the date value change computed by the nextValue and previousValue methods. The calendarField parameter must be one of the Calendar field constants like Calendar.MONTH or Calendar.MINUTE. The nextValue and previousValue methods simply move the specified Calendar field forward or backward by one unit with the Calendar.add method. You should use this method with care as some UIs may set the calendarField before commiting the edit to spin the field under the cursor. If you only want one field to spin you can subclass and ignore the setCalendarField calls.
        Parameters:
        calendarField - one of
        • Calendar.ERA
        • Calendar.YEAR
        • Calendar.MONTH
        • Calendar.WEEK_OF_YEAR
        • Calendar.WEEK_OF_MONTH
        • Calendar.DAY_OF_MONTH
        • Calendar.DAY_OF_YEAR
        • Calendar.DAY_OF_WEEK
        • Calendar.DAY_OF_WEEK_IN_MONTH
        • Calendar.AM_PM
        • Calendar.HOUR
        • Calendar.HOUR_OF_DAY
        • Calendar.MINUTE
        • Calendar.SECOND
        • Calendar.MILLISECOND

        This method fires a ChangeEvent if the calendarField has changed.

        See Also:
        getCalendarField(), getNextValue(), getPreviousValue(), Calendar.add(int, int), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)

      • getCalendarField

        public int getCalendarField()
        Returns the Calendar field that is added to or subtracted from by the nextValue and previousValue methods.
        Returns:
        the value of the calendarField property
        See Also:
        setCalendarField(int)

      • getDate

        public Date getDate()
        Returns the current element in this sequence of Dates. This method is equivalent to (Date)getValue.
        Returns:
        the value property
        See Also:
        setValue(java.lang.Object)

      • setValue

        public void setValue(Object value)
        Sets the current Date for this sequence. If value is null, an IllegalArgumentException is thrown. No bounds checking is done here: the new value may invalidate the (start <= value < end) invariant enforced by the constructors. Naturally, one should ensure that the (start <= value <= maximum) invariant is true before calling the nextValue, previousValue, or setValue methods.

        This method fires a ChangeEvent if the value has changed.

        Specified by:
        setValue in interface SpinnerModel
        Parameters:
        value - the current (non null) Date for this sequence
        Throws:
        IllegalArgumentException - if value is null or not a Date
        See Also:
        getDate(), getValue(), AbstractSpinnerModel.addChangeListener(javax.swing.event.ChangeListener)

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Dokument erstellt 11/06/2005, zuletzt geändert 04/03/2020
Quelle des gedruckten Dokuments:https://www.gaudry.be/de/java-api-rf-javax/swing/spinnerdatemodel.html

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