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Java 8 Swing Date Picker. Easy to use, good looking, nice features, and
localized. Uses the JSR-310 standard.
package com.github.lgooddatepicker.components;
import com.privatejgoodies.forms.layout.FormLayout;
import com.privatejgoodies.forms.layout.ConstantSize;
import com.privatejgoodies.forms.layout.ColumnSpec;
import com.privatejgoodies.forms.factories.CC;
import com.github.lgooddatepicker.optionalusertools.DateChangeListener;
import com.github.lgooddatepicker.optionalusertools.DateTimeChangeListener;
import com.github.lgooddatepicker.optionalusertools.TimeChangeListener;
import com.github.lgooddatepicker.zinternaltools.DateChangeEvent;
import com.github.lgooddatepicker.zinternaltools.DateTimeChangeEvent;
import com.github.lgooddatepicker.zinternaltools.TimeChangeEvent;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import javax.swing.JPanel;
/**
* DateTimePicker, This class combines a date picker with a time picker. This class provides
* functionality for creating and manipulating the two components as a single unit. This class also
* provides functions for getting or setting the combined date and time as a java.time.LocalDateTime
* object.
*
* This class is implemented as a relatively thin wrapper around the DatePicker and TimePicker
* instances. Those instances can be accessed with the getDatePicker() and getTimePicker()
* functions.
*
* There are a small number of customizable settings that apply specifically to the DateTimePicker
* class. Each of those settings is contained inside the TimePickerSettings class, and begin with
* the prefix "zDateTimePicker_".
*
* For information on how to use or customize the DatePicker and TimePicker classes, see the
* javadocs for those two classes.
*
* You can create an instance of DateTimePicker using the default constructor, which will create a
* DatePicker and a TimePicker that has default settings and uses the default locale. Alternatively,
* you can supply a DatePickerSettings instance and/or a TimePickerSettings instance when you
* construct this class.
*/
public class DateTimePicker extends JPanel {
/**
* datePicker, This holds the date picker component of this DateTimePicker.
*/
public DatePicker datePicker;
/**
* dateTimeChangeListeners, This holds a list of dateTimeChangeListeners that wish to be
* notified whenever the last valid date or the last valid time has changed.
*/
private ArrayList dateTimeChangeListeners =
new ArrayList();
/**
* timePicker, This holds the time picker component of this DateTimePicker.
*/
public TimePicker timePicker;
/**
* Constructor with default settings. This creates a new instance of DateTimePicker, with
* default DatePicker and TimePicker settings, in the default locale.
*/
public DateTimePicker() {
this(null, null);
}
/**
* Constructor with custom settings. This creates a new instance of DateTimePicker, with the
* supplied DatePicker and TimePicker settings.
*/
public DateTimePicker(DatePickerSettings datePickerSettingsOrNull,
TimePickerSettings timePickerSettingsOrNull) {
initComponents();
DatePickerSettings dateSettings = (datePickerSettingsOrNull == null)
? new DatePickerSettings() : datePickerSettingsOrNull;
TimePickerSettings timeSettings = (timePickerSettingsOrNull == null)
? new TimePickerSettings() : timePickerSettingsOrNull;
datePicker = new DatePicker(dateSettings);
timePicker = new TimePicker(timeSettings);
add(datePicker, CC.xy(1, 1));
add(timePicker, CC.xy(3, 1));
// Create a change listener instance, and add it to each component.
DateTimeChangeListenerImplementation listener
= new DateTimeChangeListenerImplementation(this);
datePicker.addDateChangeListener(listener);
timePicker.addTimeChangeListener(listener);
// Set the gap size between the date picker and the time picker.
int gapPixels = (timeSettings.zDateTimePicker_GapBeforeTimePickerPixels == null)
? 5 : timeSettings.zDateTimePicker_GapBeforeTimePickerPixels;
this.setGapSize(gapPixels, ConstantSize.PIXEL);
// If the user has not changed the gap size for the date picker, then set it to zero.
if (dateSettings.getGapBeforeButtonPixels() == null) {
datePicker.getSettings().setGapBeforeButtonPixels(0);
}
// If the user has not changed the gap size for the time picker, then set it to zero.
if (timeSettings.getGapBeforeButtonPixels() == null) {
timePicker.getSettings().setGapBeforeButtonPixels(0);
}
}
/**
* addDateTimeChangeListener, This adds a change listener to this DateTimePicker. For additional
* details, see the DateTimeChangeListener class documentation.
*/
public void addDateTimeChangeListener(DateTimeChangeListener listener) {
dateTimeChangeListeners.add(listener);
}
/**
* clear, This will clear the date picker and the time picker. This will clear both the text and
* the last valid value of each component.
*/
public void clear() {
datePicker.clear();
timePicker.clear();
}
/**
* getDatePicker, This returns the date picker component of this DateTimePicker.
*/
public DatePicker getDatePicker() {
return datePicker;
}
/**
* removeDateTimeChangeListener, This removes the specified change listener from this
* DateTimePicker.
*/
public void removeDateTimeChangeListener(DateTimeChangeListener listener) {
dateTimeChangeListeners.remove(listener);
}
/**
* getDateTime, This attempts to retrieve the date from the date picker, and the time from the
* time picker, as a single LocalDateTime value.
*
* This will return null if the date picker or the time picker contains null (an empty value) as
* its last valid value.
*
* This can return null if "allowEmptyDates" is true for either the date or time picker. If
* allowEmptyDates is false for both components, then this can never return null.
*
* Note: If the automatic validation of the date picker text or the time picker text has not yet
* occurred, then the value returned from this function may not always match the current text.
*
* See the DatePicker.getDate() and TimePicker.getTime() functions for additional details.
*/
public LocalDateTime getDateTime() {
LocalDate dateValue = datePicker.getDate();
LocalTime timeValue = timePicker.getTime();
if (dateValue == null || timeValue == null) {
return null;
}
return LocalDateTime.of(dateValue, timeValue);
}
/**
* getDateTimeAndAllowEmptyTimes, This attempts to retrieve the date from the date picker, and
* the time from the time picker, as a single LocalDateTime value. If the time picker is empty,
* the time portion of the returned value will be set to LocalTime.MIDNIGHT.
*
* If the date picker contains a valid date but the time picker contains null (is empty), then a
* LocalDateTime will be returned with its time components set to LocalTime.MIDNIGHT. If the
* date picker contains null, then this function will return null.
*
* This can return null if "allowEmptyDates" is true for the date picker. If allowEmptyDates is
* false for the date picker, then this can never return null.
*
* Note: If the automatic validation of the date picker text or the time picker text has not yet
* occurred, then the value returned from this function may not always match the current text.
*
* See the DatePicker.getDate() and TimePicker.getTime() functions for additional details.
*/
public LocalDateTime getDateTimeAndAllowEmptyTimes() {
LocalDate dateValue = datePicker.getDate();
LocalTime timeValue = timePicker.getTime();
timeValue = (timeValue == null) ? LocalTime.MIDNIGHT : timeValue;
if (dateValue == null) {
return null;
}
return LocalDateTime.of(dateValue, timeValue);
}
/**
* getDateTimeChangeListeners, This returns a new ArrayList, that contains any change listeners
* that are registered with this DateTimePicker.
*/
public ArrayList getDateTimeChangeListeners() {
return new ArrayList(dateTimeChangeListeners);
}
/**
* getTimePicker, This returns the time picker component of this DateTimePicker.
*/
public TimePicker getTimePicker() {
return timePicker;
}
/**
* isDateTimeAllowed, This checks to see if the specified value is allowed by any currently set
* veto policies and "allowEmptyValues" settings of both the DatePicker and TimePicker
* components.
*
* If the specified value would be allowed by both components, then this returns true. If the
* specified value would not be allowed by either or both components, then this returns false.
*
* For additional details, see: DatePicker.isDateAllowed() and TimePicker.isTimeAllowed().
*/
public boolean isDateTimeAllowed(LocalDateTime value) {
LocalDate datePortion = (value == null) ? null : value.toLocalDate();
LocalTime timePortion = (value == null) ? null : value.toLocalTime();
boolean isDateAllowed = datePicker.isDateAllowed(datePortion);
boolean isTimeAllowed = timePicker.isTimeAllowed(timePortion);
return (isDateAllowed && isTimeAllowed);
}
/**
* isEnabled, Returns true if this component is enabled, otherwise returns false.
*/
@Override
public boolean isEnabled() {
return super.isEnabled();
}
/**
* setDateTime, This uses the supplied LocalDateTime to set the value of the DatePicker and the
* TimePicker. Values that are set from this function are processed through the same validation
* procedures as values that are typed by the user.
*
* More specifically:
*
* Date validation and time validation are performed separately. Date validation is handled by
* the DatePicker, and time validation is handled by the TimePicker. The veto policy and
* "allowEmptyValues" settings are used to determine whether or not a particular value is
* "allowed".
*
* Allowed values will be set in the text field, and also committed to the "last valid value" of
* the applicable component. Disallowed values will be set in the text field (with a disallowed
* indicator font), but will not be committed to the "last valid value" of the applicable
* component.
*
* It is possible for a particular LocalDateTime value to be allowed by one component (and
* therefore committed to that component), but not allowed by the other component.
*
* A value can be checked against any current veto policies, and against the allowEmptyTimes
* settings, by calling isDateTimeAllowed(). This can be used to determine (in advance), if a
* particular value would be allowed by both components.
*
* Note: If empty values are allowed by both components, and there is no veto policy on either
* component, then all possible values will (always) be allowed. These are the default settings
* of the components.
*
* For additional details about the automatic date and time validation, see:
* DatePicker.setDate() and TimePicker.setTime().
*/
public void setDateTime(LocalDateTime optionalDateTime) {
if (optionalDateTime == null) {
datePicker.setDate(null);
timePicker.setTime(null);
return;
}
datePicker.setDate(optionalDateTime.toLocalDate());
timePicker.setTime(optionalDateTime.toLocalTime());
}
/**
* setEnabled, This enables or disables the DateTimePicker. When the component is enabled, dates
* and times can be selected by the user using any methods that are allowed by the current
* settings. When the component is disabled, there is no way for the user to interact with the
* components. More specifically, dates and times cannot be selected with the mouse, or with the
* keyboard, and the date and time pickers change their color scheme to indicate the disabled
* state. Any currently stored text and last valid values are retained while the component is
* disabled.
*/
@Override
public void setEnabled(boolean enabled) {
super.setEnabled(enabled);
datePicker.setEnabled(enabled);
timePicker.setEnabled(enabled);
}
/**
* setGapSize, This sets the size of the gap between the date picker and the time picker.
*/
public void setGapSize(int gapSize, ConstantSize.Unit units) {
ConstantSize gapSizeObject = new ConstantSize(gapSize, units);
ColumnSpec columnSpec = ColumnSpec.createGap(gapSizeObject);
FormLayout layout = (FormLayout) getLayout();
layout.setColumnSpec(2, columnSpec);
}
/**
* toString, This returns a string representation of the values which are currently stored in
* the date and time picker. If the last valid value of the date picker it is null, or the last
* valid value of the time picker is null, then this will return an empty string ("").
*
* Javadocs from LocalDateTime.toString():
*
* Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}.
*
* The output will be one of the following ISO-8601 formats:
*
* - {@code uuuu-MM-dd'T'HH:mm}
* - {@code uuuu-MM-dd'T'HH:mm:ss}
* - {@code uuuu-MM-dd'T'HH:mm:ss.SSS}
* - {@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}
* - {@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}
*
* The format used will be the shortest that outputs the full value of the time where the
* omitted parts are implied to be zero.
*/
@Override
public String toString() {
LocalDateTime dateTime = getDateTime();
String text = (dateTime == null) ? "" : dateTime.toString();
return text;
}
/**
* toStringAndAllowEmptyTimes, This returns a string representation of the values which are
* currently stored in the date and time picker. If the last valid value of the date picker is
* null, then this will return an empty string (""). If the last valid value of the time picker
* is null, then that portion of the time will be replaced with LocalTime.MIDNIGHT.
*
* Javadocs from LocalDateTime.toString():
*
* Outputs this date-time as a {@code String}, such as {@code 2007-12-03T10:15:30}.
*
* The output will be one of the following ISO-8601 formats:
*
* - {@code uuuu-MM-dd'T'HH:mm}
* - {@code uuuu-MM-dd'T'HH:mm:ss}
* - {@code uuuu-MM-dd'T'HH:mm:ss.SSS}
* - {@code uuuu-MM-dd'T'HH:mm:ss.SSSSSS}
* - {@code uuuu-MM-dd'T'HH:mm:ss.SSSSSSSSS}
*
* The format used will be the shortest that outputs the full value of the time where the
* omitted parts are implied to be zero.
*/
public String toStringAndAllowEmptyTimes() {
LocalDateTime dateTime = getDateTimeAndAllowEmptyTimes();
String text = (dateTime == null) ? "" : dateTime.toString();
return text;
}
/**
* initComponents, This is automatically generated code that is supplied by JFormDesigner. This
* should not be modified directly, it should only be modified from within JFormDesigner. This
* initializes the components of the panel.
*/
private void initComponents() {
// JFormDesigner - Component initialization - DO NOT MODIFY //GEN-BEGIN:initComponents
//======== this ========
setLayout(new FormLayout(
"pref:grow, 5px, pref:grow(0.6)",
"fill:pref:grow"));
// JFormDesigner - End of component initialization //GEN-END:initComponents
}
/**
* JFormDesigner variables, This is automatically generated code that is supplied by
* JFormDesigner. This should not be modified directly, it should only be modified from within
* JFormDesigner. These are any variables which are contained in the panel.
*/
// JFormDesigner - Variables declaration - DO NOT MODIFY //GEN-BEGIN:variables
// JFormDesigner - End of variables declaration //GEN-END:variables
//
/**
* DateTimeChangeListenerImplementation, This private class implements the listener interfaces
* for the DatePicker and the TimePicker. An instance of this class is added to the DatePicker
* and the TimePicker, so that the DateTimePicker can listen for changes to those components.
*/
private class DateTimeChangeListenerImplementation
implements DateChangeListener, TimeChangeListener {
/**
* source, This holds a reference to the parent DateTimePicker.
*/
private final DateTimePicker source;
/**
* Constructor.
*/
public DateTimeChangeListenerImplementation(DateTimePicker source) {
this.source = source;
}
/**
* dateChanged, This is called by the DatePicker component when the date has changed.
*/
@Override
public void dateChanged(DateChangeEvent dateChangeEvent) {
reportDateOrTimeChange(dateChangeEvent, null);
}
/**
* timeChanged, This is called by the TimePicker component when the time has changed.
*/
@Override
public void timeChanged(TimeChangeEvent timeChangeEvent) {
reportDateOrTimeChange(null, timeChangeEvent);
}
/**
* reportDateOrTimeChange, This notifies any DateTimePicker change listeners of the
* specified change events.
*/
private void reportDateOrTimeChange(DateChangeEvent dateEvent, TimeChangeEvent timeEvent) {
DateTimeChangeEvent summaryEvent = new DateTimeChangeEvent(source,
source.datePicker, source.timePicker, dateEvent, timeEvent);
for (DateTimeChangeListener listener : dateTimeChangeListeners) {
listener.dateOrTimeChanged(summaryEvent);
}
}
}
}
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