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Fluent interface for functional GUI testing

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/*
 * 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.
 *
 * Copyright 2012-2018 the original author or authors.
 */
package org.assertj.swing.monitor;

import java.awt.Window;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.annotation.Nonnull;

import org.assertj.swing.annotation.RunsInEDT;

/**
 * Keeps track of window visibility state.
 * 
 * @author Alex Ruiz
 * @author Yvonne Wang
 */
class WindowVisibilityMonitor extends WindowAdapter implements ComponentListener {
  private final Windows windows;

  WindowVisibilityMonitor(@Nonnull Windows windows) {
    this.windows = windows;
  }

  @Override
  public void componentShown(ComponentEvent e) {
    Object source = e.getSource();
    if (!(source instanceof Window)) {
      return;
    }
    windows.markAsShowing((Window) source);
  }

  @Override
  public void componentHidden(ComponentEvent e) {
    Object source = e.getSource();
    if (!(source instanceof Window)) {
      return;
    }
    windows.markAsHidden((Window) source);
  }

  @RunsInEDT
  @Override
  public void windowClosed(WindowEvent e) {
    Window w = e.getWindow();
    w.removeComponentListener(this);
    w.removeWindowListener(this);
  }

  @Override
  public void componentMoved(ComponentEvent e) {
  }

  @Override
  public void componentResized(ComponentEvent e) {
  }
}