A silly little class to draw icons with an alpha level. I was going to make

this an anonymous inner class for something else, but I figured it could be
useful somewhere else in the future...


git-svn-id: https://samskivert.googlecode.com/svn/trunk@1416 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/swing/DimmedIcon.java

@@ -0,0 +1,63 @@
+//
+// $Id: DimmedIcon.java,v 1.1 2004/04/23 16:46:37 ray Exp $
+
+package com.samskivert.swing;
+
+import java.awt.AlphaComposite;
+import java.awt.Component;
+import java.awt.Composite;
+import java.awt.Graphics;
+import java.awt.Graphics2D;
+
+import javax.swing.Icon;
+
+/**
+ * Draws an icon with a specified alpha level.
+ */
+public class DimmedIcon implements Icon
+{
+    /**
+     * Construct a dimmed icon that is drawn at 50% normal.
+     */
+    public DimmedIcon (Icon icon)
+    {
+        this(icon, .5f);
+    }
+
+    /**
+     * Construct a dimmed icon that is drawn at the specified alpha level.
+     */
+    public DimmedIcon (Icon icon, float alpha)
+    {
+        _alpha = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);
+        _icon = icon;
+    }
+
+    // documentation inherited from interface Icon
+    public int getIconWidth ()
+    {
+        return _icon.getIconWidth();
+    }
+
+    // documentation inherited from interface Icon
+    public int getIconHeight ()
+    {
+        return _icon.getIconHeight();
+    }
+
+    // documentation inherited from interface Icon
+    public void paintIcon (Component c, Graphics g, int x, int y)
+    {
+        Graphics2D gfx = (Graphics2D) g;
+        Composite ocomp = gfx.getComposite();
+        gfx.setComposite(_alpha);
+        _icon.paintIcon(c, gfx, x, y);
+        gfx.setComposite(ocomp);
+    }
+
+    /** The icon we're actually drawing. */
+    protected Icon _icon;
+
+    /** Our alpha composite. */
+    protected Composite _alpha;
+}