java/java-impl/src/com/intellij/codeInsight/javadoc/ColorUtil.java

   1 /*
   2  * Copyright 2000-2009 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.codeInsight.javadoc;
  17
  18 import com.intellij.psi.*;
  19 import com.intellij.util.ArrayUtil;
  20 import org.jetbrains.annotations.NotNull;
  21
  22 import java.awt.*;
  23 import java.lang.reflect.Field;
  24
  25 /**
  26  * @author spleaner
  27  */
  28 public class ColorUtil {
  29   private ColorUtil() {
  30   }
  31
  32   public static String toHex(@NotNull final Color color) {
  33     final StringBuffer sb = new StringBuffer();
  34     for (int i = 0; i < 3; i++) {
  35       String s = Integer.toHexString(i == 0 ? color.getRed() : i == 1 ? color.getGreen() : color.getBlue());
  36       if (s.length() < 2) {
  37         sb.append('0');
  38       }
  39
  40       sb.append(s);
  41     }
  42
  43     return sb.toString();
  44   }
  45
  46   public static String generatePreviewHtml(@NotNull final Color color) {
  47     return String.format("<div style=\"width: 50px; height: 30px; background-color: #%s; border: 1px solid #222;\">&nbsp;</div>", toHex(color));
  48   }
  49
  50   public static void appendColorPreview(final PsiVariable variable, final StringBuilder buffer) {
  51     final PsiExpression initializer = variable.getInitializer();
  52     if (initializer != null) {
  53       final PsiType type = initializer.getType();
  54       if (type != null && "java.awt.Color".equals(type.getCanonicalText())) {
  55         if (initializer instanceof PsiNewExpression) {
  56           final PsiExpressionList argumentList = ((PsiNewExpression) initializer).getArgumentList();
  57           if (argumentList != null) {
  58             final PsiExpression[] expressions = argumentList.getExpressions();
  59             int[] values = ArrayUtil.newIntArray(expressions.length);
  60             float[] values2 = new float[expressions.length];
  61             int i = 0;
  62             int j = 0;
  63
  64             final PsiConstantEvaluationHelper helper = JavaPsiFacade.getInstance(initializer.getProject()).getConstantEvaluationHelper();
  65             for (final PsiExpression each : expressions) {
  66               final Object o = helper.computeConstantExpression(each);
  67               if (o instanceof Integer) {
  68                 values[i] = ((Integer) o).intValue();
  69                 values[i] = values[i] > 255 ? 255 : values[i] < 0 ? 0 : values[i];
  70                 i++;
  71               } else if (o instanceof Float) {
  72                 values2[j] = ((Float) o).floatValue();
  73                 values2[j] = values2[j] > 1 ? 1 : values2[j] < 0 ? 0 : values2[j];
  74                 j++;
  75               }
  76             }
  77
  78             Color c = null;
  79             if (i == expressions.length) {
  80               switch (values.length) {
  81                 case 1:
  82                   c = new Color(values[0]);
  83                   break;
  84                 case 3:
  85                   c = new Color(values[0], values[1], values[2]);
  86                   break;
  87                 case 4:
  88                   c = new Color(values[0], values[1], values[2], values[3]);
  89                   break;
  90                 default:
  91                   break;
  92               }
  93             } else if (j == expressions.length) {
  94               switch (values2.length) {
  95                 case 3:
  96                   c = new Color(values2[0], values2[1], values2[2]);
  97                   break;
  98                 case 4:
  99                   c = new Color(values2[0], values2[1], values2[2], values2[3]);
 100                   break;
 101                 default:
 102                   break;
 103               }
 104             }
 105
 106             if (c != null) {
 107               buffer.append(generatePreviewHtml(c));
 108             }
 109           }
 110         } else if (initializer instanceof PsiReferenceExpression) {
 111           final PsiReference reference = initializer.getReference();
 112           if (reference != null) {
 113             final PsiElement psiElement = reference.resolve();
 114             if (psiElement instanceof PsiField) {
 115               final PsiClass psiClass = ((PsiField) psiElement).getContainingClass();
 116               if (psiClass != null && "java.awt.Color".equals(psiClass.getQualifiedName())) {
 117                 try {
 118                   Field field = Class.forName("java.awt.Color").getField(((PsiField)psiElement).getName());
 119                   final Color c = (Color) field.get(null);
 120                   buffer.append(generatePreviewHtml(c));
 121                 } catch (Exception e) {
 122                   // nothing
 123                 }
 124               }
 125             }
 126           }
 127         }
 128       }
 129     }
 130   }
 131 }