/*
 * $Id: BasicLoginPaneUI.java,v 1.6 2007/12/04 22:39:33 rah003 Exp $
 *
 * Copyright 2004 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This 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
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.plaf.basic;
import java.awt.Font;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.geom.GeneralPath;
import java.awt.image.BufferedImage;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.JComponent;
import javax.swing.UIManager;
import javax.swing.plaf.ComponentUI;

import org.jdesktop.swingx.JXLoginPane;
import org.jdesktop.swingx.plaf.LoginPaneUI;
import org.jdesktop.swingx.plaf.UIManagerExt;
/**
 * Base implementation of the <code>JXLoginPane</code> UI.
 *
 * @author rbair
 */
public class BasicLoginPaneUI extends LoginPaneUI {
    private class LocaleHandler implements PropertyChangeListener {
        /**
         * {@inheritDoc}
         */
        public void propertyChange(PropertyChangeEvent evt) {
            Object src = evt.getSource();
            
            if (src instanceof JComponent) {
                ((JComponent) src).updateUI();
            }
        }
    }
    
    private JXLoginPane dlg;
    
    /** Creates a new instance of BasicLoginDialogUI */
    public BasicLoginPaneUI(JXLoginPane dlg) {
        this.dlg = dlg;
//        dlg.addPropertyChangeListener("locale", new LocaleHandler());
    }
    
  public static ComponentUI createUI(JComponent c) {
    return new BasicLoginPaneUI((JXLoginPane)c);
  }

    public void installUI(JComponent c) {
        installDefaults();
    }
    
    protected void installDefaults() {
        String s = dlg.getBannerText();
        if (s == null || s.equals("")) {
            dlg.setBannerText(UIManagerExt.getString("JXLoginPane.bannerString", dlg.getLocale()));
        }
        
        s = dlg.getErrorMessage();
        if (s == null || s.equals("")) {
            dlg.setErrorMessage(UIManagerExt.getString("JXLoginPane.errorMessage", dlg.getLocale()));
        }
    }
    
    /**
     * Creates default 400x60 banner for the login panel.
     * @see org.jdesktop.swingx.plaf.LoginPaneUI#getBanner()
     */
    public Image getBanner() {
        int w = 400;
        int h = 60;
        float loginStringX = w * .05f;
        float loginStringY = h * .75f;

        BufferedImage img = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2 = img.createGraphics();
        Font font = UIManager.getFont("JXLoginPane.bannerFont");
        g2.setFont(font);
        Graphics2D originalGraphics = g2;
        if(!dlg.getComponentOrientation().isLeftToRight()) {
            originalGraphics = (Graphics2D)g2.create();
            g2.scale(-1, 1);
            g2.translate(-w, 0);
            loginStringX = w - (((float)font.getStringBounds(dlg.getBannerText(), 
                    originalGraphics.getFontRenderContext()).getWidth()) + w * .05f);
        } 

        g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
        g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);

        //draw a big square
        g2.setColor(UIManager.getColor("JXLoginPane.bannerDarkBackground"));
        g2.fillRect(0, 0, w, h);

        //create the curve shape
        GeneralPath curveShape = new GeneralPath(GeneralPath.WIND_NON_ZERO);
        curveShape.moveTo(0, h * .6f);
        curveShape.curveTo(w * .167f, h * 1.2f, w * .667f, h * -.5f, w, h * .75f);
        curveShape.lineTo(w, h);
        curveShape.lineTo(0, h);
        curveShape.lineTo(0, h * .8f);
        curveShape.closePath();

        //draw into the buffer a gradient (bottom to top), and the text "Login"
        GradientPaint gp = new GradientPaint(0, h, UIManager.getColor("JXLoginPane.bannerDarkBackground"),
                0, 0, UIManager.getColor("JXLoginPane.bannerLightBackground"));
        g2.setPaint(gp);
        g2.fill(curveShape);

        originalGraphics.setColor(UIManager.getColor("JXLoginPane.bannerForeground"));
        originalGraphics.drawString(dlg.getBannerText(), loginStringX, loginStringY);
        
        return img;
    }
}