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    <p>I implemented a solution using <code>JXLayer</code> a little while ago, which uses it's lock effect capabilities to provide a "blocking" layer over the container.</p> <p>It's based on <a href="https://java.net/projects/jxlayer/" rel="nofollow">JXLayer 3.x</a> and uses the filters from <a href="http://www.jhlabs.com/" rel="nofollow">JHLabs</a> to generate it's "gray scale" effect</p> <pre><code>import com.jhlabs.image.GrayscaleFilter; import java.awt.BorderLayout; import java.awt.Component; import java.awt.LayoutManager; import java.awt.RenderingHints; import java.util.ArrayList; import java.util.List; import java.util.Map; import javax.swing.JComponent; import javax.swing.JPanel; import org.jdesktop.jxlayer.JXLayer; import org.jdesktop.jxlayer.QualityHints; import org.jdesktop.jxlayer.plaf.BetterBufferedImageOpEffect; import org.jdesktop.jxlayer.plaf.LayerUI; import org.jdesktop.jxlayer.plaf.ext.LockableUI; public class CoreXPane extends JPanel { private JXLayer&lt;JPanel&gt; layer; private FadedLockUI fadedLockUI; private JPanel pnlBody; public CoreXPane(LayoutManager layout) { super.setLayout(new BorderLayout()); super.addImpl(getLayer(), BorderLayout.CENTER, 0); setLayout(layout); } public CoreXPane() { this(new BorderLayout()); } @Override public void setEnabled(boolean enabled) { getLockUI().setLocked(!enabled); getBodyPane().setEnabled(enabled); super.setEnabled(enabled); } @Override protected void addImpl(Component comp, Object constraints, int index) { getBodyPane().add(comp, constraints, index); } @Override public void remove(int index) { getBodyPane().remove(index); } @Override public void removeAll() { getBodyPane().removeAll(); } protected FadedLockUI getLockUI() { if (fadedLockUI == null) { fadedLockUI = new FadedLockUI(); } return fadedLockUI; } @Override public void invalidate() { getLockUI().invalidate(); super.invalidate(); } @Override public void revalidate() { getLockUI().revalidate(); super.revalidate(); } @Override public void repaint() { getLockUI().repaint(); super.repaint(); } protected void getLayers(List&lt;LayerUI&gt; layers) { layers.add(getLockUI()); } protected JXLayer&lt;JPanel&gt; getLayer() { if (layer == null) { List&lt;LayerUI&gt; layers = new ArrayList&lt;LayerUI&gt;(4); getLayers(layers); JComponent wrapper = getBodyPane(); for (LayerUI ui : layers) { wrapper = new JXLayer(wrapper, ui); } layer = (JXLayer&lt;JPanel&gt;) wrapper; } return layer; } @Override public void setLayout(LayoutManager mgr) { getBodyPane().setLayout(mgr); } @Override public LayoutManager getLayout() { return getBodyPane().getLayout(); } public JPanel getBodyPane() { if (pnlBody == null) { pnlBody = new JPanel(); pnlBody.setLayout(new BorderLayout()); } return pnlBody; } @Override public void setOpaque(boolean isOpaque) { super.setOpaque(isOpaque); getBodyPane().setOpaque(isOpaque); } public static class FadedLockUI extends LockableUI { public static Map&lt;RenderingHints.Key, Object&gt; mapRenderHints = new QualityHints(); public FadedLockUI() { setLockedEffects(new BufferedImageOpEffect(new GrayscaleFilter())); mapRenderHints.put(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY); // okay mapRenderHints.put(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // bad mapRenderHints.put(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY); // okay mapRenderHints.put(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE); mapRenderHints.put(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON); mapRenderHints.put(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); mapRenderHints.put(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY); } @Override protected Map&lt;RenderingHints.Key, Object&gt; getRenderingHints(JXLayer&lt;? extends JComponent&gt; l) { return mapRenderHints; } public void repaint() { setDirty(true); } public void invalidate() { setDirty(true); } public void revalidate() { setDirty(true); } } } </code></pre> <p>Take a look at <a href="https://weblogs.java.net/blog/alexfromsun/archive/2008/07/jxlayer_30_lock.html" rel="nofollow">LockableUI</a> for more details</p>
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