plugins/ui-designer/src/com/intellij/uiDesigner/palette/UIDesignerPaletteProvider.java

/*
 * Copyright 2000-2009 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.uiDesigner.palette;

import com.intellij.ide.palette.PaletteGroup;
import com.intellij.ide.palette.PaletteItemProvider;
import com.intellij.openapi.fileTypes.StdFileTypes;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NonNls;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;

/**
 * @author yole
 */
public class UIDesignerPaletteProvider implements PaletteItemProvider {
  @NonNls private static final String PROPERTY_GROUPS = "groups";

  private final Project myProject;
  private final PropertyChangeSupport myPropertyChangeSupport = new PropertyChangeSupport(this);
  private Palette.Listener myListener;

  public UIDesignerPaletteProvider(final Project project) {
    myProject = project;
  }

  void fireGroupsChanged() {
    myPropertyChangeSupport.firePropertyChange(PROPERTY_GROUPS, null, null);
  }

  public PaletteGroup[] getActiveGroups(VirtualFile vFile) {
    if (vFile.getFileType().equals(StdFileTypes.GUI_DESIGNER_FORM)) {
      Palette palette = Palette.getInstance(myProject);
      if (myListener == null) {
        myListener = new Palette.Listener() {
          @Override
          public void groupsChanged(Palette palette) {
            fireGroupsChanged();
          }
        };
        palette.addListener(myListener);
      }
      return palette.getToolWindowGroups();
    }
    return PaletteGroup.EMPTY_ARRAY;
  }

  public void addListener(PropertyChangeListener listener) {
    myPropertyChangeSupport.addPropertyChangeListener(listener);
  }

  public void removeListener(PropertyChangeListener listener) {
    myPropertyChangeSupport.removePropertyChangeListener(listener);
  }
}