platform/platform-impl/src/com/intellij/ide/actions/HelpTopicsAction.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.ide.actions;

import com.intellij.openapi.actionSystem.AnAction;
import com.intellij.openapi.actionSystem.AnActionEvent;
import com.intellij.openapi.application.ApplicationInfo;
import com.intellij.openapi.help.HelpManager;
import com.intellij.openapi.project.DumbAware;

public class HelpTopicsAction extends AnAction implements DumbAware {
  public void actionPerformed(AnActionEvent e) {
    HelpManager.getInstance().invokeHelp("top");
  }

  @Override
  public void update(AnActionEvent e) {
    super.update(e);
    
    boolean enabled = ApplicationInfo.helpAvailable();
    e.getPresentation().setEnabled(enabled);
    e.getPresentation().setVisible(enabled);
  }
}