workspace/plasma/dataengines/nowplaying/playerinterface/pollingwatcher.h

   1 /*
   2  * Copyright 2008  Alex Merry <alex.merry@kdemail.net>
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17 #ifndef POLLINGWATCHER_H
  18 #define POLLINGWATCHER_H
  19
  20
  21 #include <QObject>
  22 #include <QSet>
  23 #include <QString>
  24
  25 #include "player.h"
  26
  27 class QTimer;
  28
  29 class PollingPlayerFactory;
  30
  31 class PollingWatcher : public QObject
  32 {
  33     Q_OBJECT
  34
  35 public:
  36     PollingWatcher(QObject* parent = 0);
  37
  38     QList<Player::Ptr> players();
  39
  40     /**
  41      * Adds a service to watch for.
  42      *
  43      * @param factory the factory for the player
  44      */
  45     void addFactory(PollingPlayerFactory* factory);
  46
  47 Q_SIGNALS:
  48     /**
  49      * A new player is available
  50      */
  51     void newPlayer(Player::Ptr player);
  52     /**
  53      * A previously existing player is no longer available
  54      *
  55      * @param player the now-invalid player
  56      */
  57     void playerDisappeared(Player::Ptr player);
  58
  59 private Q_SLOTS:
  60     void checkPlayers();
  61
  62 private:
  63     // the factories we are waiting for player to appear on
  64     QSet<PollingPlayerFactory*> m_polledFactories;
  65     // the factories we have a player for
  66     QSet<PollingPlayerFactory*> m_usedFactories;
  67     QSet<Player::Ptr> m_players;
  68     QTimer* m_timer;
  69 };
  70
  71 #endif // POLLINGWATCHER_H