/*
 * Copyright (c) 2012, the Dart project authors.
 * 
 * Licensed under the Eclipse Public License v1.0 (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.eclipse.org/legal/epl-v10.html
 * 
 * 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.google.dart.tools.search.internal.ui.text;

import org.eclipse.jface.preference.JFacePreferences;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.util.IPropertyChangeListener;
import org.eclipse.jface.util.PropertyChangeEvent;
import org.eclipse.jface.viewers.ColumnViewer;
import org.eclipse.jface.viewers.DecoratingStyledCellLabelProvider;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.StyledString;
import org.eclipse.jface.viewers.StyledString.Styler;
import org.eclipse.jface.viewers.ViewerColumn;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyleRange;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.IWorkbenchPreferenceConstants;
import org.eclipse.ui.PlatformUI;

public class DecoratingFileSearchLabelProvider extends DecoratingStyledCellLabelProvider implements
    IPropertyChangeListener, ILabelProvider {

  private static final String HIGHLIGHT_BG_COLOR_NAME = "com.google.dart.tools.search.ui.match.highlight"; //$NON-NLS-1$

  public static final Styler HIGHLIGHT_STYLE = StyledString.createColorRegistryStyler(
      null,
      HIGHLIGHT_BG_COLOR_NAME);

  public DecoratingFileSearchLabelProvider(FileLabelProvider provider) {
    super(provider, PlatformUI.getWorkbench().getDecoratorManager().getLabelDecorator(), null);
  }

  public void initialize(ColumnViewer viewer, ViewerColumn column) {
    PlatformUI.getPreferenceStore().addPropertyChangeListener(this);
    JFaceResources.getColorRegistry().addListener(this);

    setOwnerDrawEnabled(showColoredLabels());

    super.initialize(viewer, column);
  }

  public void dispose() {
    super.dispose();
    PlatformUI.getPreferenceStore().removePropertyChangeListener(this);
    JFaceResources.getColorRegistry().removeListener(this);
  }

  private void refresh() {
    ColumnViewer viewer = getViewer();

    if (viewer == null) {
      return;
    }
    boolean showColoredLabels = showColoredLabels();
    if (showColoredLabels != isOwnerDrawEnabled()) {
      setOwnerDrawEnabled(showColoredLabels);
      viewer.refresh();
    } else if (showColoredLabels) {
      viewer.refresh();
    }
  }

  protected StyleRange prepareStyleRange(StyleRange styleRange, boolean applyColors) {
    if (!applyColors && styleRange.background != null) {
      styleRange = super.prepareStyleRange(styleRange, applyColors);
      styleRange.borderStyle = SWT.BORDER_DOT;
      return styleRange;
    }
    return super.prepareStyleRange(styleRange, applyColors);
  }

  public static boolean showColoredLabels() {
    return PlatformUI.getPreferenceStore().getBoolean(
        IWorkbenchPreferenceConstants.USE_COLORED_LABELS);
  }

  public void propertyChange(PropertyChangeEvent event) {
    String property = event.getProperty();
    if (property.equals(JFacePreferences.QUALIFIER_COLOR)
        || property.equals(JFacePreferences.COUNTER_COLOR)
        || property.equals(JFacePreferences.DECORATIONS_COLOR)
        || property.equals(HIGHLIGHT_BG_COLOR_NAME)
        || property.equals(IWorkbenchPreferenceConstants.USE_COLORED_LABELS)) {
      Display.getDefault().asyncExec(new Runnable() {
        public void run() {
          refresh();
        }
      });
    }
  }

  public String getText(Object element) {
    return getStyledText(element).getString();
  }

}