ColorSampleLookupValue.java

/*
 * Copyright 2000-2015 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.intellij.xml.util;

import com.intellij.codeInsight.lookup.DeferredUserLookupValue;
import com.intellij.codeInsight.lookup.LookupItem;
import com.intellij.codeInsight.lookup.LookupValueWithPriority;
import com.intellij.codeInsight.lookup.LookupValueWithUIHint;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.util.Iconable;
import com.intellij.openapi.util.text.StringUtil;
import com.intellij.psi.PsiElement;
import com.intellij.xml.XmlBundle;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.awt.*;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;

/**
 * @author maxim
 */
public class ColorSampleLookupValue implements LookupValueWithUIHint, DeferredUserLookupValue, Iconable, LookupValueWithPriority {
  private static volatile ColorSampleLookupValue[] ourColors;
  private final boolean myIsStandard;
  private final String myName;
  private final String myValue;
  private Color myColor;
  @NonNls private static final String BR = "<br>";


  public ColorSampleLookupValue(String name, String value, boolean isStandard) {
    myName = name;
    myValue = value;
    myIsStandard = isStandard;
  }

  @Override
  public String getPresentation() {
    return myName != null ? myName : myValue;
  }

  public String getValue() {
    return myValue;
  }

  public boolean isIsStandard() {
    return myIsStandard;
  }

  @Override
  public Icon getIcon(int flags) {
    if (myColor == null) {
      if (myValue.startsWith("#")) {
        try {
          myColor = Color.decode("0x" + myValue.substring(1));
        }
        catch (NumberFormatException e) {
          return null;
        }
      }
    }

    if (myColor != null) {
      return ColorIconCache.getIconCache().getIcon(myColor, 32);
    }

    return null;
  }

  @Override
  public boolean handleUserSelection(LookupItem item, Project project) {
    if (!myIsStandard) {
      item.setLookupString(myValue);
    }
    return true;
  }

  @NotNull
  public static ColorSampleLookupValue[] getColors() {
    if (ourColors == null) {
      synchronized (ColorSampleLookupValue.class) {
        if (ourColors == null) {
          List<ColorSampleLookupValue> colorsList = new LinkedList<>();
          StringTokenizer tokenizer = new StringTokenizer(ColorMap.systemColorsString, "\n");

          while (tokenizer.hasMoreTokens()) {
            String name = tokenizer.nextToken();
            colorsList.add(new ColorSampleLookupValue(name, name, false));
            tokenizer.nextToken();
          }

          tokenizer = new StringTokenizer(ColorMap.standardColorsString, ", \n");
          HashMap<String, String> standardColors = new HashMap<>();

          while (tokenizer.hasMoreTokens()) {
            String name = tokenizer.nextToken();
            String value = tokenizer.nextToken();
            standardColors.put(name, name);

            colorsList.add(new ColorSampleLookupValue(name, value, true));
          }

          tokenizer = new StringTokenizer(ColorMap.colorsString, " \t\n");

          while (tokenizer.hasMoreTokens()) {
            String name = tokenizer.nextToken();
            String hexValue = tokenizer.nextToken();

            tokenizer.nextToken(); // skip rgb

            if (!standardColors.containsKey(name)) {
              colorsList.add(new ColorSampleLookupValue(name, hexValue, false));
            }
          }

          ourColors = colorsList.toArray(new ColorSampleLookupValue[colorsList.size()]);
        }
      }
    }
    return ourColors;
  }

  @Override
  @Nullable
  public String getTypeHint() {
    return myName != null && !StringUtil.startsWithChar(myName, '#') 
           && myValue != null && StringUtil.startsWithChar(myValue, '#') ? myValue : null;
  }

  @Override
  @Nullable
  public Color getColorHint() {
    return null;
  }

  @Override
  public boolean isBold() {
    return false;
  }

  public String getName() {
    return myName;
  }

  @Override
  public int getPriority() {
    return myName == null || Character.isLowerCase(myName.charAt(0)) ? HIGHER : NORMAL;
  }

  public static void addColorPreviewAndCodeToLookup(final PsiElement currentElement, final StringBuilder buf) {
    final Color colorFromElement = UserColorLookup.getColorFromElement(currentElement);

    if (colorFromElement != null) {
      addColorPreviewAndCodeToLookup(colorFromElement, buf);
    }
  }

  private static String toHex(@NotNull final Color color) {
    final StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 3; i++) {
      String s = Integer.toHexString(i == 0 ? color.getRed() : i == 1 ? color.getGreen() : color.getBlue());
      if (s.length() < 2) {
        sb.append('0');
      }

      sb.append(s);
    }

    return sb.toString();
  }

  public static void addColorPreviewAndCodeToLookup(final Color color, final StringBuilder buf) {
    if (color == null) return;
    final String code = '#' + toHex(color);
    final String colorName = ColorMap.getColorNameForHexCode(code);
    if (colorName != null) {
      buf.append(XmlBundle.message("color.name", colorName)).append(BR);
    }

    String colorBox = "<div style=\"border: 1px solid #000000; width: 50px; height: 20px; background-color:" + code + "\"></div>";
    buf.append(XmlBundle.message("color.preview", colorBox)).append(BR);
  }

  @Override
  public String toString() {
    return myName == null ? myValue : myValue + " " + myName;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (!(o instanceof ColorSampleLookupValue)) {
      return false;
    }

    ColorSampleLookupValue value = (ColorSampleLookupValue)o;

    if (myIsStandard != value.myIsStandard) {
      return false;
    }
    if (myColor != null ? !myColor.equals(value.myColor) : value.myColor != null) {
      return false;
    }
    if (myName != null ? !myName.equals(value.myName) : value.myName != null) {
      return false;
    }
    if (myValue != null ? !myValue.equals(value.myValue) : value.myValue != null) {
      return false;
    }

    return true;
  }

  @Override
  public int hashCode() {
    int result = (myIsStandard ? 1 : 0);
    result = 31 * result + (myName != null ? myName.hashCode() : 0);
    result = 31 * result + (myValue != null ? myValue.hashCode() : 0);
    result = 31 * result + (myColor != null ? myColor.hashCode() : 0);
    return result;
  }
}