src/3rdparty/phonon/mmf/ancestormovemonitor.h - qt in Qt

/*  This file is part of the KDE project.

Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

This library is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2.1 or 3 of the License.

This library 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with this library.  If not, see <http://www.gnu.org/licenses/>.

*/

#ifndef PHONON_MMF_ANCESTORMOVEMONITOR_H
#define PHONON_MMF_ANCESTORMOVEMONITOR_H

#include <QObject>
#include <QHash>
#include <QList>

QT_BEGIN_NAMESPACE

namespace Phonon
{
namespace MMF
{
class DsaVideoOutput;

class AncestorMoveMonitor : public QObject
{
    Q_OBJECT

public:
    explicit AncestorMoveMonitor(QObject *parent);
    ~AncestorMoveMonitor();

    /**
     * Register target widget for notification.
     *
     * The widget receives an ancestorMoveEvent callback when a move event
     * is delivered to any of its ancestors:
     *
     * If the target is already registered, this function causes its
     * ancestor list to be updated - therefore it should be called when
     * the target receives a ParentChange event.
     */
    void registerTarget(DsaVideoOutput *target);

    /**
     * Remove target from the monitor.
     *
     * The target will no longer receive notification when move events are
     * delivered to its ancestors.
     */
    void unRegisterTarget(DsaVideoOutput *target);

protected:
    /**
     * Function which receives events from the global event filter.
     */
    bool eventFilter(QObject *watched, QEvent *event);

    void dump();

private:
    /**
     * List of registered target widgets which descend from a given
     * ancestor.
     *
     * Note that the members of the list should be non-redundant; this
     * invariant is checked in debug builds.  Semantically, the value is
     * therefore a set, however we use QList rather than QSet for
     * efficiency of iteration.
     */
    typedef QList<DsaVideoOutput *> TargetList;

    /**
     * Map from widget on which the move event occurs, to widgets which
     * descend from it and therefore need to be notified.
     */
    typedef QHash<QObject *, TargetList> Hash;
    Hash m_hash;

};
}
}

QT_END_NAMESPACE

#endif // !PHONON_MMF_ANCESTORMOVEMONITOR_H

1	/* This file is part of the KDE project.
2
3	Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4
5	This library is free software: you can redistribute it and/or modify
6	it under the terms of the GNU Lesser General Public License as published by
7	the Free Software Foundation, either version 2.1 or 3 of the License.
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
12	GNU Lesser General Public License for more details.
13
14	You should have received a copy of the GNU Lesser General Public License
15	along with this library. If not, see <http://www.gnu.org/licenses/>.
16
17	*/
18
19	#ifndef PHONON_MMF_ANCESTORMOVEMONITOR_H
20	#define PHONON_MMF_ANCESTORMOVEMONITOR_H
21
22	#include <QObject>
23	#include <QHash>
24	#include <QList>
25
26	QT_BEGIN_NAMESPACE
27
28	namespace Phonon
29	{
30	namespace MMF
31	{
32	class DsaVideoOutput;
33
34	class AncestorMoveMonitor : public QObject
35	{
36	Q_OBJECT
37
38	public:
39	explicit AncestorMoveMonitor(QObject *parent);
40	~AncestorMoveMonitor();
41
42	/**
43	* Register target widget for notification.
44	*
45	* The widget receives an ancestorMoveEvent callback when a move event
46	* is delivered to any of its ancestors:
47	*
48	* If the target is already registered, this function causes its
49	* ancestor list to be updated - therefore it should be called when
50	* the target receives a ParentChange event.
51	*/
52	void registerTarget(DsaVideoOutput *target);
53
54	/**
55	* Remove target from the monitor.
56	*
57	* The target will no longer receive notification when move events are
58	* delivered to its ancestors.
59	*/
60	void unRegisterTarget(DsaVideoOutput *target);
61
62	protected:
63	/**
64	* Function which receives events from the global event filter.
65	*/
66	bool eventFilter(QObject watched, QEvent event);
67
68	void dump();
69
70	private:
71	/**
72	* List of registered target widgets which descend from a given
73	* ancestor.
74	*
75	* Note that the members of the list should be non-redundant; this
76	* invariant is checked in debug builds. Semantically, the value is
77	* therefore a set, however we use QList rather than QSet for
78	* efficiency of iteration.
79	*/
80	typedef QList<DsaVideoOutput *> TargetList;
81
82	/**
83	* Map from widget on which the move event occurs, to widgets which
84	* descend from it and therefore need to be notified.
85	*/
86	typedef QHash<QObject *, TargetList> Hash;
87	Hash m_hash;
88
89	};
90	}
91	}
92
93	QT_END_NAMESPACE
94
95	#endif // !PHONON_MMF_ANCESTORMOVEMONITOR_H

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