eventfilter.hpp

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/*
 * WengoPhone, a voice over Internet phone
 * Copyright (C) 2004-2005  Wengo
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef EVENTFILTER_H
#define EVENTFILTER_H

#include "utilspp/NonCopyable.hpp"
#include <qobject.h>
#include <qevent.h>

namespace taxidermy {
  /**
   * EventFilter for QObject.
   *
   * Permits to make some special actions on Qt events.
   * Example:
   * <code>
   * QMainWindow * widget = new QMainWindow();
   * CloseEventFilter * closeFilter = new CloseEventFilter(this, SLOT(printHelloWorld()));
   * ResizeEventFilter * resizeFilter = new ResizeEventFilter(this, SLOT(printHelloWorld()));
   * widget->installEventFilter(closeFilter);
   * widget->installEventFilter(resizeFilter);
   * </code>
   *
   * @author Tanguy Krotoff
   */
  class EventFilter : public QObject, utilspp::NonCopyable {
    Q_OBJECT
  public:

    /**
     * Filters an event.
     *
     * @param receiver object receiver of the filter signal
     * @param member member of the object called by the filter signal
     * @param watched watched object the filter is going to be applied on
     */
    EventFilter(QObject * receiver, const char * member, QObject * watched);

  protected:

    /**
     * Emits the filter signal.
     *
     * @param event event filtered
     */
    void filter(QEvent * event);

    /**
     * Filters the event.
     *
     * @param watched watched object
     * @param event event filtered of the watched object
     * @return true then stops the event being handled further
     */
    virtual bool eventFilter(QObject * watched, QEvent * event);

    /**
     * Watched object.
     *
     * The filter is going to be applied only on this QObject.
     */
    QObject * mWatched;

    signals:

    void activate(QEvent * event);
  };
};

#endif	//EVENTFILTER_H