xml/impl/src/com/intellij/xml/util/ColorIconCache.java

   1 /*
   2  * Copyright 2000-2010 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.xml.util;
  17
  18 import com.intellij.util.containers.HashMap;
  19 import com.intellij.util.containers.SoftFactoryMap;
  20 import com.intellij.util.containers.WeakFactoryMap;
  21 import com.intellij.util.ui.EmptyIcon;
  22 import org.jetbrains.annotations.NotNull;
  23
  24 import javax.swing.*;
  25 import java.awt.*;
  26 import java.util.Map;
  27
  28 /**
  29  * @author spleaner
  30  */
  31 public class ColorIconCache {
  32   private static final ColorIconCache INSTANCE = new ColorIconCache();
  33   private static final SoftFactoryMap<Color, Map<Integer, Icon>> ourCache = new SoftFactoryMap<Color, Map<Integer, Icon>>() {
  34     @Override
  35     protected Map<Integer, Icon> create(Color key) {
  36       return new HashMap<Integer, Icon>();
  37     }
  38   };
  39
  40   private ColorIconCache() {
  41   }
  42
  43   public static ColorIconCache getIconCache() {
  44     return INSTANCE;
  45   }
  46
  47   @SuppressWarnings({"MethodMayBeStatic"})
  48   public Icon getIcon(@NotNull final Color color, final int size) {
  49     Icon icon = ourCache.get(color).get(size);
  50     if (icon == null) {
  51       icon = new ColorIcon(size, color);
  52       ourCache.get(color).put(size, icon);
  53     }
  54
  55     return icon;
  56   }
  57
  58   public static class ColorIcon extends EmptyIcon {
  59     private Color myColor;
  60     private Color[] myColours;
  61
  62     public ColorIcon(final int size, final Color color) {
  63       super(size);
  64       myColor = color;
  65     }
  66
  67     public ColorIcon(final int size, final Color[] colours) {
  68       super(size);
  69       myColours = colours;
  70     }
  71
  72     @Override
  73     public void paintIcon(final Component component, final Graphics g, final int i, final int j) {
  74       final int iconWidth = getIconWidth();
  75       final int iconHeight = getIconHeight();
  76       if (myColor != null) {
  77         g.setColor(myColor);
  78         g.fillRect(i, j, iconWidth, iconHeight);
  79       }
  80       else if (myColours != null) {
  81         final Color top = myColours[0];
  82         g.setColor(top);
  83         g.fillRect(i, j, iconWidth, 2);
  84
  85         final Color right = myColours[1];
  86         g.setColor(right);
  87         g.fillRect(i + iconWidth / 2, j + 2, iconWidth / 2, iconHeight / 2);
  88
  89         final Color bottom = myColours[2];
  90         g.setColor(bottom);
  91         g.fillRect(i, j + iconHeight - 2, iconWidth, 2);
  92
  93         final Color left = myColours[3];
  94         g.setColor(left);
  95         g.fillRect(i, j + 2, iconWidth / 2, iconHeight / 2);
  96       }
  97
  98       final Composite old = ((Graphics2D)g).getComposite();
  99       ((Graphics2D)g).setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.1f));
 100       g.setColor(Color.BLACK);
 101       g.drawRect(i, j, iconWidth-1, iconHeight-1);
 102       ((Graphics2D)g).setComposite(old);
 103     }
 104   }
 105 }