/*
 * Copyright 2000-2012 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.AnActionEvent;
import com.intellij.openapi.actionSystem.DefaultActionGroup;
import com.intellij.openapi.actionSystem.Presentation;
import com.intellij.openapi.project.DumbAware;

/**
 * This group hides itself when there's no registered children.
 *
 * @see com.intellij.ide.actions.SmartPopupActionGroup
 * @see com.intellij.ide.actions.NonTrivialActionGroup
 */
public class NonEmptyActionGroup extends DefaultActionGroup implements DumbAware {
  public NonEmptyActionGroup() {
    super();
  }

  public void update(AnActionEvent event) {
    Presentation presentation = event.getPresentation();
    presentation.setVisible(getChildrenCount() > 0);
  }

  public boolean hideIfNoVisibleChildren() {
    return true;
  }
}
