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WebLaf is a Java Swing Look and Feel and extended components library for cross-platform applications
/*
* 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 component type
* @param decoration type
* @param shadow type
* @author Mikle Garin
*/
@XStreamAlias ( "ExpandingShadow" )
public class ExpandingShadow, I extends ExpandingShadow>
extends AbstractShadow
{
/**
* Shadow images cache.
*/
protected static final Map> shadowCache = new HashMap> ( 4 );
/**
* Last shadow image cache key.
*/
protected transient String shadowKey;
/**
* Currently used shadow image.
*/
protected transient NinePatchIcon shadowImage;
@Override
public void paint ( final Graphics2D g2d, final Rectangle bounds, final E c, final D d, final Shape shape )
{
final int width = getWidth ();
final float opacity = getOpacity ();
if ( width > 0 && opacity > 0f )
{
final ShadowType type = getType ();
if ( type == ShadowType.outer )
{
final Rectangle b = shape.getBounds ();
final Rectangle sb = new Rectangle ( b.x - width, b.y - width, b.width + width * 2, b.height + width * 2 );
getShadow ( sb, width, opacity ).paintIcon ( g2d, sb.x, sb.y, sb.width, sb.height );
}
else
{
throw new RuntimeException ( "Inner shadow type is not supported by this shadow" );
}
}
}
/**
* Returns cached shadow image.
* Image is updated if some related settings have changed.
*
* @param bounds shadow bounds
* @param width shadow width
* @param opacity shadow opacity
* @return cached shadow image
*/
protected NinePatchIcon getShadow ( final Rectangle bounds, final int width, final float opacity )
{
final String key = getShadowKey ( bounds, width, opacity );
if ( shadowImage == null || !CompareUtils.equals ( shadowKey, key ) )
{
shadowKey = key;
shadowImage = getShadeCache ( bounds, width, opacity );
}
return shadowImage;
}
/**
* Returns shadow image cache key.
* It is optimized to only take bounds height and shadow width into account.
* Bounds width is not considered because it is always sufficient and should never really affect this shadow image.
*
* @param b shadow bounds
* @param width shadow width
* @param opacity shadow opacity
* @return shadow image cache key
*/
protected static String getShadowKey ( final Rectangle b, final int width, final float opacity )
{
return b.height + "," + width + "," + opacity;
}
/**
* Returns cached shadow image.
*
* @param b shadow bounds
* @param width shadow width
* @param opacity shadow opacity
* @return cached shadow image
*/
protected static NinePatchIcon getShadeCache ( final Rectangle b, final int width, final float opacity )
{
final String key = getShadowKey ( b, width, opacity );
final WeakReference reference = shadowCache.get ( key );
if ( reference == null || reference.get () == null )
{
// Creating shadow pattern
final GeneralPath gp = new GeneralPath ( GeneralPath.WIND_EVEN_ODD );
gp.moveTo ( b.x + width * 1.45, b.y + width * 1.45 );
gp.lineTo ( b.x + b.width - width * 1.45, b.y + width * 1.45 );
gp.lineTo ( b.x + b.width - width, b.y + b.height - width );
gp.quadTo ( b.x + b.width / 2, b.y + b.height - width * 1.9, b.x + width, b.y + b.height - width );
gp.closePath ();
// Creating shadow image
final BufferedImage shadowImage = ImageUtils.createShadeImage ( b.width, b.height, gp, width, opacity, false );
// Creating nine-patch icon based on shadow image
final int w = shadowImage.getWidth ();
final int inner = width / 2;
final NinePatchIcon ninePatchIcon = NinePatchIcon.create ( shadowImage );
ninePatchIcon.addHorizontalStretch ( 0, width + inner, true );
ninePatchIcon.addHorizontalStretch ( width + inner + 1, w - width - inner - 1, false );
ninePatchIcon.addHorizontalStretch ( w - width - inner, w, true );
ninePatchIcon.addVerticalStretch ( 0, width + inner, true );
ninePatchIcon.addVerticalStretch ( width + inner + 1, w - width - inner - 1, false );
ninePatchIcon.addVerticalStretch ( w - width - inner, w, true );
ninePatchIcon.setMargin ( width );
// Caching shadow icon
shadowCache.put ( key, new WeakReference ( ninePatchIcon ) );
}
return shadowCache.get ( key ).get ();
}
}