/*

 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package javax.swing;

import java.awt.*;

import java.awt.event.*;

import javax.swing.event.*;

import javax.swing.text.*;

import javax.swing.plaf.SpinnerUI;

import java.util.*;

import java.beans.*;

import java.text.*;

import java.io.*;

import java.text.spi.DateFormatProvider;

import java.text.spi.NumberFormatProvider;

import javax.accessibility.*;

import sun.util.locale.provider.LocaleProviderAdapter;

import sun.util.locale.provider.LocaleResources;

import sun.util.locale.provider.LocaleServiceProviderPool;

/**

 * A single line input field that lets the user select a

 * number or an object value from an ordered sequence. Spinners typically

 * provide a pair of tiny arrow buttons for stepping through the elements

 * of the sequence. The keyboard up/down arrow keys also cycle through the

 * elements. The user may also be allowed to type a (legal) value directly

 * into the spinner. Although combo boxes provide similar functionality,

 * spinners are sometimes preferred because they don't require a drop down list

 * that can obscure important data.

 * <p>

 * A <code>JSpinner</code>'s sequence value is defined by its

 * <code>SpinnerModel</code>.

 * The <code>model</code> can be specified as a constructor argument and

 * changed with the <code>model</code> property.  <code>SpinnerModel</code>

 * classes for some common types are provided: <code>SpinnerListModel</code>,

 * <code>SpinnerNumberModel</code>, and <code>SpinnerDateModel</code>.

 * <p>

 * A <code>JSpinner</code> has a single child component that's

 * responsible for displaying

 * and potentially changing the current element or <i>value</i> of

 * the model, which is called the <code>editor</code>.  The editor is created

 * by the <code>JSpinner</code>'s constructor and can be changed with the

 * <code>editor</code> property.  The <code>JSpinner</code>'s editor stays

 * in sync with the model by listening for <code>ChangeEvent</code>s. If the

 * user has changed the value displayed by the <code>editor</code> it is

 * possible for the <code>model</code>'s value to differ from that of

 * the <code>editor</code>. To make sure the <code>model</code> has the same

 * value as the editor use the <code>commitEdit</code> method, eg:

 * <pre>

 *   try {

 *       spinner.commitEdit();

 *   }

 *   catch (ParseException pe) {{

 *       // Edited value is invalid, spinner.getValue() will return

 *       // the last valid value, you could revert the spinner to show that:

 *       JComponent editor = spinner.getEditor()

 *       if (editor instanceof DefaultEditor) {

 *           ((DefaultEditor)editor).getTextField().setValue(spinner.getValue();

 *       }

 *       // reset the value to some known value:

 *       spinner.setValue(fallbackValue);

 *       // or treat the last valid value as the current, in which

 *       // case you don't need to do anything.

 *   }

 *   return spinner.getValue();

 * </pre>

 * <p>

 * For information and examples of using spinner see

 * <a href="http://docs.oracle.com/javase/tutorial/uiswing/components/spinner.html">How to Use Spinners</a>,

 * a section in <em>The Java Tutorial.</em>

 * <p>

 * <strong>Warning:</strong> Swing is not thread safe. For more

 * information see <a

 * href="package-summary.html#threading">Swing's Threading

 * Policy</a>.

 * <p>

 * <strong>Warning:</strong>

 * Serialized objects of this class will not be compatible with

 * future Swing releases. The current serialization support is

 * appropriate for short term storage or RMI between applications running

 * the same version of Swing.  As of 1.4, support for long term storage

 * of all JavaBeans™

 * has been added to the <code>java.beans</code> package.

 * Please see {@link java.beans.XMLEncoder}.

 *

 * @beaninfo

 *   attribute: isContainer false

 * description: A single line input field that lets the user select a

 *     number or an object value from an ordered set.

 *

 * @see SpinnerModel

 * @see AbstractSpinnerModel

 * @see SpinnerListModel

 * @see SpinnerNumberModel

 * @see SpinnerDateModel

 * @see JFormattedTextField

 *

 * @author Hans Muller

 * @author Lynn Monsanto (accessibility)

 * @since 1.4

 */

@SuppressWarnings("serial") // Same-version serialization only

public class JSpinner extends JComponent implements Accessible

{

    /**

     * @see #getUIClassID

     * @see #readObject

     */

    private static final String uiClassID = "SpinnerUI";

    private static final Action DISABLED_ACTION = new DisabledAction();

    private SpinnerModel model;

    private JComponent editor;

    private ChangeListener modelListener;

    private transient ChangeEvent changeEvent;

    private boolean editorExplicitlySet = false;

    /**

     * Constructs a spinner for the given model. The spinner has

     * a set of previous/next buttons, and an editor appropriate

     * for the model.

     *

     * @throws NullPointerException if the model is {@code null}

     */

    public JSpinner(SpinnerModel model) {

        if (model == null) {

            throw new NullPointerException("model cannot be null");

        }

        this.model = model;

        this.editor = createEditor(model);

        setUIProperty("opaque",true);

        updateUI();

    }

    /**

     * Constructs a spinner with an <code>Integer SpinnerNumberModel</code>

     * with initial value 0 and no minimum or maximum limits.

     */

    public JSpinner() {

        this(new SpinnerNumberModel());

    }

    /**

     * Returns the look and feel (L&F) object that renders this component.

     *

     * @return the <code>SpinnerUI</code> object that renders this component

     */

    public SpinnerUI getUI() {

        return (SpinnerUI)ui;

    }

    /**

     * Sets the look and feel (L&F) object that renders this component.

     *

     * @param ui  the <code>SpinnerUI</code> L&amp;F object

     * @see UIDefaults#getUI

     */

    public void setUI(SpinnerUI ui) {

        super.setUI(ui);

    }

    /**

     * Returns the suffix used to construct the name of the look and feel

     * (L&F) class used to render this component.

     *

     * @return the string "SpinnerUI"

     * @see JComponent#getUIClassID

     * @see UIDefaults#getUI

     */

    public String getUIClassID() {

        return uiClassID;

    }

    /**

     * Resets the UI property with the value from the current look and feel.

     *

     * @see UIManager#getUI

     */

    public void updateUI() {

        setUI((SpinnerUI)UIManager.getUI(this));

        invalidate();

    }

    /**

     * This method is called by the constructors to create the

     * <code>JComponent</code>

     * that displays the current value of the sequence.  The editor may

     * also allow the user to enter an element of the sequence directly.

     * An editor must listen for <code>ChangeEvents</code> on the

     * <code>model</code> and keep the value it displays

     * in sync with the value of the model.

     * <p>

     * Subclasses may override this method to add support for new

     * <code>SpinnerModel</code> classes.  Alternatively one can just

     * replace the editor created here with the <code>setEditor</code>

     * method.  The default mapping from model type to editor is:

     * <ul>

     * <li> <code>SpinnerNumberModel =&gt; JSpinner.NumberEditor</code>

     * <li> <code>SpinnerDateModel =&gt; JSpinner.DateEditor</code>

     * <li> <code>SpinnerListModel =&gt; JSpinner.ListEditor</code>

     * <li> <i>all others</i> =&gt; <code>JSpinner.DefaultEditor</code>

     * </ul>

     *

     * @return a component that displays the current value of the sequence

     * @param model the value of getModel

     * @see #getModel

     * @see #setEditor

     */

    protected JComponent createEditor(SpinnerModel model) {

        if (model instanceof SpinnerDateModel) {

            return new DateEditor(this);

        }

        else if (model instanceof SpinnerListModel) {

            return new ListEditor(this);

        }

        else if (model instanceof SpinnerNumberModel) {

            return new NumberEditor(this);

        }

        else {

            return new DefaultEditor(this);

        }

    }

    /**

     * Changes the model that represents the value of this spinner.

     * If the editor property has not been explicitly set,

     * the editor property is (implicitly) set after the <code>"model"</code>

     * <code>PropertyChangeEvent</code> has been fired.  The editor

     * property is set to the value returned by <code>createEditor</code>,

     * as in:

     * <pre>

     * setEditor(createEditor(model));

     * </pre>

     *

     * @param model the new <code>SpinnerModel</code>

     * @see #getModel

     * @see #getEditor

     * @see #setEditor

     * @throws IllegalArgumentException if model is <code>null</code>

     *

     * @beaninfo

     *        bound: true

     *    attribute: visualUpdate true

     *  description: Model that represents the value of this spinner.

     */

    public void setModel(SpinnerModel model) {

        if (model == null) {

            throw new IllegalArgumentException("null model");

        }

        if (!model.equals(this.model)) {

            SpinnerModel oldModel = this.model;

            this.model = model;

            if (modelListener != null) {

                oldModel.removeChangeListener(modelListener);

                this.model.addChangeListener(modelListener);

            }

            firePropertyChange("model", oldModel, model);

            if (!editorExplicitlySet) {

                setEditor(createEditor(model)); // sets editorExplicitlySet true

                editorExplicitlySet = false;

            }

            repaint();

            revalidate();

        }

    }

    /**

     * Returns the <code>SpinnerModel</code> that defines

     * this spinners sequence of values.

     *

     * @return the value of the model property

     * @see #setModel

     */

    public SpinnerModel getModel() {

        return model;

    }

    /**

     * Returns the current value of the model, typically

     * this value is displayed by the <code>editor</code>. If the

     * user has changed the value displayed by the <code>editor</code> it is

     * possible for the <code>model</code>'s value to differ from that of

     * the <code>editor</code>, refer to the class level javadoc for examples

     * of how to deal with this.

     * <p>

     * This method simply delegates to the <code>model</code>.

     * It is equivalent to:

     * <pre>

     * getModel().getValue()

     * </pre>

     *

     * @see #setValue

     * @see SpinnerModel#getValue

     */

    public Object getValue() {

        return getModel().getValue();

    }

    /**

     * Changes current value of the model, typically

     * this value is displayed by the <code>editor</code>.

     * If the <code>SpinnerModel</code> implementation

     * doesn't support the specified value then an

     * <code>IllegalArgumentException</code> is thrown.

     * <p>

     * This method simply delegates to the <code>model</code>.

     * It is equivalent to:

     * <pre>

     * getModel().setValue(value)

     * </pre>

     *

     * @throws IllegalArgumentException if <code>value</code> isn't allowed

     * @see #getValue

     * @see SpinnerModel#setValue

     */

    public void setValue(Object value) {

        getModel().setValue(value);

    }

    /**

     * Returns the object in the sequence that comes after the object returned

     * by <code>getValue()</code>. If the end of the sequence has been reached

     * then return <code>null</code>.

     * Calling this method does not effect <code>value</code>.

     * <p>

     * This method simply delegates to the <code>model</code>.

     * It is equivalent to:

     * <pre>

     * getModel().getNextValue()

     * </pre>

     *

     * @return the next legal value or <code>null</code> if one doesn't exist

     * @see #getValue

     * @see #getPreviousValue

     * @see SpinnerModel#getNextValue

     */

    public Object getNextValue() {

        return getModel().getNextValue();

    }

    /**

     * We pass <code>Change</code> events along to the listeners with the

     * the slider (instead of the model itself) as the event source.

     */

    private class ModelListener implements ChangeListener, Serializable {

        public void stateChanged(ChangeEvent e) {

            fireStateChanged();

        }

    }

    /**

     * Adds a listener to the list that is notified each time a change

     * to the model occurs.  The source of <code>ChangeEvents</code>

     * delivered to <code>ChangeListeners</code> will be this

     * <code>JSpinner</code>.  Note also that replacing the model

     * will not affect listeners added directly to JSpinner.

     * Applications can add listeners to  the model directly.  In that

     * case is that the source of the event would be the

     * <code>SpinnerModel</code>.

     *

     * @param listener the <code>ChangeListener</code> to add

     * @see #removeChangeListener

     * @see #getModel

     */

    public void addChangeListener(ChangeListener listener) {

        if (modelListener == null) {

            modelListener = new ModelListener();

            getModel().addChangeListener(modelListener);

        }

        listenerList.add(ChangeListener.class, listener);

    }

    /**

     * Removes a <code>ChangeListener</code> from this spinner.

     *

     * @param listener the <code>ChangeListener</code> to remove

     * @see #fireStateChanged

     * @see #addChangeListener

     */

    public void removeChangeListener(ChangeListener listener) {

        listenerList.remove(ChangeListener.class, listener);

    }

    /**

     * Returns an array of all the <code>ChangeListener</code>s added

     * to this JSpinner with addChangeListener().

     *

     * @return all of the <code>ChangeListener</code>s added or an empty

     *         array if no listeners have been added

     * @since 1.4

     */

    public ChangeListener[] getChangeListeners() {

        return listenerList.getListeners(ChangeListener.class);

    }

    /**

     * Sends a <code>ChangeEvent</code>, whose source is this

     * <code>JSpinner</code>, to each <code>ChangeListener</code>.

     * When a <code>ChangeListener</code> has been added

     * to the spinner, this method method is called each time

     * a <code>ChangeEvent</code> is received from the model.

     *

     * @see #addChangeListener

     * @see #removeChangeListener

     * @see EventListenerList

     */

    protected void fireStateChanged() {

        Object[] listeners = listenerList.getListenerList();

        for (int i = listeners.length - 2; i >= 0; i -= 2) {

            if (listeners[i] == ChangeListener.class) {

                if (changeEvent == null) {

                    changeEvent = new ChangeEvent(this);

                }

                ((ChangeListener)listeners[i+1]).stateChanged(changeEvent);

            }

        }

    }

    /**

     * Returns the object in the sequence that comes

     * before the object returned by <code>getValue()</code>.

     * If the end of the sequence has been reached then

     * return <code>null</code>. Calling this method does

     * not effect <code>value</code>.

     * <p>

     * This method simply delegates to the <code>model</code>.

     * It is equivalent to:

     * <pre>

     * getModel().getPreviousValue()

     * </pre>

     *

     * @return the previous legal value or <code>null</code>

     *   if one doesn't exist

     * @see #getValue

     * @see #getNextValue

     * @see SpinnerModel#getPreviousValue

     */

    public Object getPreviousValue() {

        return getModel().getPreviousValue();

    }

    /**

     * Changes the <code>JComponent</code> that displays the current value

     * of the <code>SpinnerModel</code>.  It is the responsibility of this

     * method to <i>disconnect</i> the old editor from the model and to

     * connect the new editor.  This may mean removing the

     * old editors <code>ChangeListener</code> from the model or the

     * spinner itself and adding one for the new editor.

     *

     * @param editor the new editor

     * @see #getEditor

     * @see #createEditor

     * @see #getModel

     * @throws IllegalArgumentException if editor is <code>null</code>

     *

     * @beaninfo

     *        bound: true

     *    attribute: visualUpdate true

     *  description: JComponent that displays the current value of the model

     */

    public void setEditor(JComponent editor) {

        if (editor == null) {

            throw new IllegalArgumentException("null editor");

        }

        if (!editor.equals(this.editor)) {

            JComponent oldEditor = this.editor;

            this.editor = editor;

            if (oldEditor instanceof DefaultEditor) {

                ((DefaultEditor)oldEditor).dismiss(this);

            }

            editorExplicitlySet = true;

            firePropertyChange("editor", oldEditor, editor);

            revalidate();

            repaint();

        }

    }