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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.
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/*
 * Copyright 2000-2014 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.jetbrains.python.codeInsight.intentions;

import com.intellij.ide.util.EditSourceUtil;
import com.intellij.openapi.editor.Document;
import com.intellij.openapi.editor.markup.TextAttributes;
import com.intellij.openapi.fileEditor.FileEditorLocation;
import com.intellij.pom.Navigatable;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiFile;
import com.intellij.usages.TextChunk;
import com.intellij.usages.UsagePresentation;
import com.intellij.usages.rules.PsiElementUsage;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import javax.swing.*;
import java.awt.*;

/**
 * Simplistic usage object for demonstration of name clashes, etc.
 * User: dcheryasov
 * Date: Oct 11, 2009 6:24:05 AM
 */
class NameUsage implements PsiElementUsage {

  private final PsiElement myElement;
  private final PsiElement myCulprit;

  static final TextAttributes SLANTED;
  private final String myName;
  private final boolean myIsPrefix;

  static {
    SLANTED = TextAttributes.ERASE_MARKER.clone();
    SLANTED.setFontType(Font.ITALIC);
  }

  /**
   * Creates a conflict search panel usage.
   * @param element where conflict happens.
   * @param culprit where name is redefined; usages with the same culprit are grouped.
   * @param name redefinition of it is what the conflict is about.
   * @param prefix if true, show name as a prefix to element's name in "would be" part.
   */
  public NameUsage(PsiElement element, PsiElement culprit, String name, boolean prefix) {
    myElement = element;
    myCulprit = culprit;
    myName = name;
    myIsPrefix = prefix;
  }

  public FileEditorLocation getLocation() {
    return null;
  }

  @NotNull
  public UsagePresentation getPresentation() {
    return new UsagePresentation() {
      @Nullable
      public Icon getIcon() {
        return myElement.isValid() ? myElement.getIcon(0) : null;
      }

      @NotNull
      public TextChunk[] getText() {
        if (myElement.isValid()) {
          TextChunk[] chunks = new TextChunk[3];
          PsiFile file = myElement.getContainingFile();
          String line_id = "...";
          final Document document = file.getViewProvider().getDocument();
          if (document != null) {
            line_id = String.valueOf(document.getLineNumber(myElement.getTextOffset()));
          }
          chunks[0] = new TextChunk(SLANTED, "(" + line_id + ") ");
          chunks[1] = new TextChunk(TextAttributes.ERASE_MARKER, myElement.getText());
          StringBuilder sb = new StringBuilder(" would become ").append(myName);
          if (myIsPrefix) sb.append(".").append(myElement.getText());
          chunks[2] = new TextChunk(SLANTED, sb.toString());
          return chunks;
        }
        else return new TextChunk[]{new TextChunk(SLANTED, "?")}; 
      }

      @NotNull
      public String getPlainText() {
        return myElement.getText();
      }

      public String getTooltipText() {
        return myElement.getText();
      }
    };
  }

  public boolean isValid() {
    return true;
  }

  public boolean isReadOnly() {
    return false;
  }

  public void selectInEditor() { }

  public void highlightInEditor() { }

  public void navigate(boolean requestFocus) {
    Navigatable descr = EditSourceUtil.getDescriptor(myElement);
    if (descr != null) descr.navigate(requestFocus);
  }

  public boolean canNavigate() {
    return EditSourceUtil.canNavigate(myElement);
  }

  public boolean canNavigateToSource() {
    return false;
  }

  public PsiElement getElement() {
    return myCulprit;
  }

  public boolean isNonCodeUsage() {
    return false;
  }
}