/*
 * This file is part of WebLookAndFeel library.
 *
 * WebLookAndFeel library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * WebLookAndFeel library 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with WebLookAndFeel library.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.alee.laf.combobox;

import com.alee.laf.WebLookAndFeel;
import com.alee.utils.swing.RendererListener;

import javax.swing.*;
import java.awt.*;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.ArrayList;
import java.util.List;

/**
 * Custom cell renderer for JComboBox value and popup list and some other similar cases.
 * It uses {@code WebComboBoxElement} as renderer which is being styled by a custom LabelPainter.
 *
 * @author Mikle Garin
 * @see WebComboBoxElement
 */

public class WebComboBoxCellRenderer implements ListCellRenderer
{
    /**
     * Renderer listeners.
     */
    protected List<RendererListener> rendererListeners = new ArrayList<RendererListener> ( 1 );

    /**
     * Actual renderer components.
     */
    protected WebComboBoxElement boxRenderer;
    protected WebComboBoxElement elementRenderer;

    /**
     * Constructs new combo box renderer.
     */
    public WebComboBoxCellRenderer ()
    {
        super ();

        // Additional renderer for combo box selected value rendering
        this.boxRenderer = new WebComboBoxElement ();
        this.boxRenderer.setStyleId ( "combo-box-value" );

        // Elements renderer
        this.elementRenderer = new WebComboBoxElement ();
        this.elementRenderer.setStyleId ( "combo-box-element" );

        // Painter change listener
        final PropertyChangeListener listener = new PropertyChangeListener ()
        {
            @Override
            public void propertyChange ( final PropertyChangeEvent evt )
            {
                fireRevalidate ();
            }
        };
        this.boxRenderer.addPropertyChangeListener ( WebLookAndFeel.PAINTER_PROPERTY, listener );
        this.elementRenderer.addPropertyChangeListener ( WebLookAndFeel.PAINTER_PROPERTY, listener );
    }

    /**
     * Returns actual combo box value renderer.
     *
     * @return actual combo box value renderer
     */
    public WebComboBoxElement getBoxRenderer ()
    {
        return boxRenderer;
    }

    /**
     * Returns actual elements renderer.
     *
     * @return actual elements renderer
     */
    public WebComboBoxElement getElementRenderer ()
    {
        return elementRenderer;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Component getListCellRendererComponent ( final JList list, final Object value, final int index, final boolean isSelected,
                                                    final boolean cellHasFocus )
    {
        // Choosing actual renderer
        final WebComboBoxElement renderer = index == -1 ? boxRenderer : elementRenderer;

        // Updating runtime variables
        renderer.setIndex ( index );
        renderer.setTotalElements ( list.getModel ().getSize () );
        renderer.setSelected ( isSelected );

        // Updating renderer visual settings
        renderer.setEnabled ( list.isEnabled () );
        renderer.setFont ( list.getFont () );
        renderer.setForeground ( isSelected ? list.getSelectionForeground () : list.getForeground () );
        renderer.setComponentOrientation ( list.getComponentOrientation () );

        // Updating icon and text
        if ( value instanceof Icon )
        {
            renderer.setIcon ( ( Icon ) value );
            renderer.setText ( "" );
        }
        else
        {
            renderer.setIcon ( null );
            renderer.setText ( value == null || value.toString ().equals ( "" ) ? " " : value.toString () );
        }

        return renderer;
    }

    /**
     * Adds RendererListener to this renderer.
     *
     * @param listener RendererListener to add
     */
    public void addRendererListener ( final RendererListener listener )
    {
        rendererListeners.add ( listener );
    }

    /**
     * Removes RendererListener from this renderer.
     *
     * @param listener RendererListener to remove
     */
    public void removeRendererListener ( final RendererListener listener )
    {
        rendererListeners.remove ( listener );
    }

    /**
     * Fires repaint event.
     */
    public void fireRepaint ()
    {
        for ( final RendererListener listener : rendererListeners )
        {
            listener.repaint ();
        }
    }

    /**
     * Fires revalidate event.
     */
    public void fireRevalidate ()
    {
        for ( final RendererListener listener : rendererListeners )
        {
            listener.revalidate ();
        }
    }
}