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/**
 * CalendarPicker.java
 *
 * Copyright (c) 2011-2014, JFXtras
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the organization nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package jfxtras.scene.control;

import java.util.Calendar;
import java.util.Locale;
import java.util.concurrent.atomic.AtomicInteger;

import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.scene.control.Control;
import javafx.scene.control.Skin;
import javafx.util.Callback;

/**
 * = Calendar picker component
 *
 * The calendar is (and should) be treated as immutable. That means the setter of Calendar is not used to modify its value, but each time a new instance (clone) is put in the calendar property.
 * So you cannot rely that exactly the same Calendar object that was set or added will be stored and returned.
 * 
 * @author Tom Eugelink
 */
public class CalendarPicker extends Control
{
	// ==================================================================================================================
	// CONSTRUCTOR
	
	/**
	 * 
	 */
	public CalendarPicker()
	{
		construct();
	}
	
	/*
	 * 
	 */
	private void construct()
	{
		// setup the CSS
		// the -fx-skin attribute in the CSS sets which Skin class is used
		this.getStyleClass().add(CalendarPicker.class.getSimpleName());
		
		// construct properties
		constructCalendar();
		constructCalendars();
		constructDisplayedCalendar();
	}

	/**
	 * Return the path to the CSS file so things are setup right
	 */
	@Override protected String getUserAgentStylesheet()
	{
		return  CalendarPicker.class.getResource("/jfxtras/internal/scene/control/" + CalendarPicker.class.getSimpleName() + ".css").toExternalForm();
	}
	
	@Override public Skin createDefaultSkin() {
		return new jfxtras.internal.scene.control.skin.CalendarPickerControlSkin(this); 
	}

	// ==================================================================================================================
	// PROPERTIES

	/** Id */
	public CalendarPicker withId(String value) { setId(value); return this; }

	/** calendar: */
	final private ObjectProperty calendarObjectProperty = new SimpleObjectProperty(this, "calendar")
	{
		public void set(Calendar value)
		{
			if (value == null && getAllowNull() == false) {
				throw new NullPointerException("Null not allowed");
			}
			super.set(value);
		}
	};
	public ObjectProperty calendarProperty() { return calendarObjectProperty; }
	public Calendar getCalendar() { return calendarObjectProperty.getValue(); }
	public void setCalendar(Calendar value) { calendarObjectProperty.setValue(value); }
	public CalendarPicker withCalendar(Calendar value) { setCalendar(value); return this; } 
	// construct property
	private void constructCalendar()
	{
		// if this value is changed by binding, make sure related things are updated
		calendarProperty().addListener(new ChangeListener()
		{
			@Override
			public void changed(ObservableValue observableValue, Calendar oldValue, Calendar newValue)
			{
				if (modifyingCalendersAtomicInteger.get() == 0) {
					// if the new value is set to null, remove the old value
					if (newValue != null && calendars().contains(newValue) == false) {
						calendars().add(newValue);
					}
					if (oldValue != null) {
						calendars().remove(oldValue);
					}
				}
			} 
		});
	}

	/** Calendars: */
	public ObservableList calendars() { return calendars; }
	final private ObservableList calendars =  javafx.collections.FXCollections.observableArrayList();
	// construct property
	private void constructCalendars()
	{
		// make sure the singled out calendar is 
		calendars.addListener(new ListChangeListener() 
		{
			@Override
			public void onChanged(javafx.collections.ListChangeListener.Change change)
			{
				modifyingCalendersAtomicInteger.addAndGet(1);
				try {
					// if this is an add
					while (change.next()) {
						for (Calendar lCalendar : change.getAddedSubList()) {
							setCalendar( lCalendar );
						}
						for (Calendar lCalendar : change.getRemoved()) {
							// if the calendar to be removed is the active one
							if (lCalendar.equals(getCalendar())) {
								// if there are other left
								if (calendars().size() > 0) {
									// select the first
									setCalendar( calendars().get(0) );
								}
								else  {
									// clear it
									setCalendar(null);
								}
							}
						}
					}
				}
				finally {
					modifyingCalendersAtomicInteger.addAndGet(-1);
				}
			}
		});
	}
	final private AtomicInteger modifyingCalendersAtomicInteger = new AtomicInteger(0);

	/** Locale: the locale is used to determine first-day-of-week, weekday labels, etc */
	public ObjectProperty localeProperty() { return localeObjectProperty; }
	volatile private ObjectProperty localeObjectProperty = new SimpleObjectProperty(this, "locale", Locale.getDefault());
	public Locale getLocale() { return localeObjectProperty.getValue(); }
	public void setLocale(Locale value) { localeObjectProperty.setValue(value); }
	public CalendarPicker withLocale(Locale value) { setLocale(value); return this; } 
	
	/** Mode: single, range or multiple */
	public ObjectProperty modeProperty() { return modeObjectProperty; }
	final private SimpleObjectProperty modeObjectProperty = new SimpleObjectProperty(this, "mode", Mode.SINGLE)
	{
		public void set(Mode value)
		{
			if (value == null) throw new NullPointerException("Null not allowed");
			super.set(value);
		}
	};
	public enum Mode { SINGLE, MULTIPLE, RANGE };
	public Mode getMode() { return modeObjectProperty.getValue(); }
	public void setMode(Mode value) { modeObjectProperty.setValue(value); }
	public CalendarPicker withMode(Mode value) { setMode(value); return this; } 

	/** ShowTime: only applicable in SINGLE mode */
	public ObjectProperty showTimeProperty() { return showTimeObjectProperty; }
	volatile private ObjectProperty showTimeObjectProperty = new SimpleObjectProperty(this, "showTime", false);
	public Boolean getShowTime() { return showTimeObjectProperty.getValue(); }
	public void setShowTime(Boolean value) { showTimeObjectProperty.setValue(value); }
	public CalendarPicker withShowTime(Boolean value) { setShowTime(value); return this; }

	/** is null allowed */
    volatile private BooleanProperty allowNullProperty = new SimpleBooleanProperty(this, "allowNull", true)
    {
		public void set(boolean value)
		{
			super.set(value);
			if (value == false && getCalendar() == null)
			{
				setCalendar(Calendar.getInstance(getLocale()));
			}
		}
	};
    public BooleanProperty allowNullProperty() { return allowNullProperty; }
    public boolean getAllowNull() { return allowNullProperty.get(); }
    public void setAllowNull(boolean allowNull) { allowNullProperty.set(allowNull); }
    public CalendarPicker withAllowNull(boolean value) { setAllowNull(value); return this; }

	/** disabledCalendars: */
	public ObservableList disabledCalendars() { return disabledCalendars; }
	final private ObservableList disabledCalendars =  javafx.collections.FXCollections.observableArrayList();

	/** highlightedCalendars: */
	public ObservableList highlightedCalendars() { return highlightedCalendars; }
	final private ObservableList highlightedCalendars =  javafx.collections.FXCollections.observableArrayList();

	/** calendarRangeCallback: 
	 * This callback allows a developer to limit the amount of calendars put in any of the collections like highlighted or disabled.
	 * It is called just before a new range is being displayed, so the developer can change the values in the collections. 
	 */
	public ObjectProperty> calendarRangeCallbackProperty() { return calendarRangeCallbackObjectProperty; }
	final private ObjectProperty> calendarRangeCallbackObjectProperty = new SimpleObjectProperty>(this, "calendarRangeCallback", null);
	public Callback getCalendarRangeCallback() { return this.calendarRangeCallbackObjectProperty.getValue(); }
	public void setCalendarRangeCallback(Callback value) { this.calendarRangeCallbackObjectProperty.setValue(value); }
	public CalendarPicker withCalendarRangeCallback(Callback value) { setCalendarRangeCallback(value); return this; }
		
	/**
	 * A Calendar range
	 */
	static public class CalendarRange
	{
		public CalendarRange(Calendar start, Calendar end)
		{
			this.start = start;
			this.end = end;
		}
		
		public Calendar getStartCalendar() { return start; }
		final Calendar start;
		
		public Calendar getEndCalendar() { return end; }
		final Calendar end; 
	}

	/**
	 * DisplayedCalendar:
	 * Yoy may set this value, but it is also overwritten by other logic and the skin. Do not assume you have total control.
	 * The calendar should not be modified using any of its add or set methods (it should be considered immutable)
	 */
	public ObjectProperty displayedCalendar() { return displayedCalendarObjectProperty; }
	volatile private ObjectProperty displayedCalendarObjectProperty = new SimpleObjectProperty(this, "displayedCalendar");
	public Calendar getDisplayedCalendar() { return displayedCalendarObjectProperty.getValue(); }
	public void setDisplayedCalendar(Calendar value) { displayedCalendarObjectProperty.setValue(value); }
	public CalendarPicker withDisplayedCalendar(Calendar value) { setDisplayedCalendar(value); return this; }
	private void constructDisplayedCalendar()
	{
		// init here, so deriveDisplayedCalendar in the skin will modify it accordingly
		setDisplayedCalendar(Calendar.getInstance(getLocale()));
	}
	
	/** valueValidationCallback: 
	 * This callback allows a developer deny or accept a value just prior before it gets added.
	 * Returning true will allow the value.
	 */
	public ObjectProperty> valueValidationCallbackProperty() { return valueValidationCallbackObjectProperty; }
	final private ObjectProperty> valueValidationCallbackObjectProperty = new SimpleObjectProperty>(this, "valueValidationCallback", null);
	public Callback getValueValidationCallback() { return this.valueValidationCallbackObjectProperty.getValue(); }
	public void setValueValidationCallback(Callback value) { this.valueValidationCallbackObjectProperty.setValue(value); }
	public CalendarPicker withValueValidationCallback(Callback value) { setValueValidationCallback(value); return this; }
}




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