objectlistmodel.h

   1 /*
   2   objectlistmodel.h
   3
   4   This file is part of GammaRay, the Qt application inspection and
   5   manipulation tool.
   6
   7   Copyright (C) 2010-2011 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
   8   Author: Volker Krause <volker.krause@kdab.com>
   9
  10   This program is free software; you can redistribute it and/or modify
  11   it under the terms of the GNU General Public License as published by
  12   the Free Software Foundation, either version 2 of the License, or
  13   (at your option) any later version.
  14
  15   This program is distributed in the hope that it will be useful,
  16   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18   GNU General Public License for more details.
  19
  20   You should have received a copy of the GNU General Public License
  21   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #ifndef GAMMARAY_OBJECTLISTMODEL_H
  25 #define GAMMARAY_OBJECTLISTMODEL_H
  26
  27 #include "objectmodelbase.h"
  28
  29 #include <QVector>
  30 #include <QReadWriteLock>
  31
  32 namespace GammaRay {
  33
  34 /**
  35  * NOTE: Making the model itself threadsafe works in theory,
  36  * but as soon as we put a proxymodel on top everything breaks.
  37  * Esp. the {begin,end}{InsertRemove}Rows() calls trigger
  38  * signals which apparently must be delivered directly to the proxy,
  39  * otherwise it's internal state may be messed up and assertions
  40  * start flying around...
  41  * So the solution: only call these methods in the main thread
  42  * and on remove. when called from a background thread, invalidate
  43  * the data first.
  44  */
  45 class ObjectListModel : public ObjectModelBase<QAbstractTableModel>
  46 {
  47   Q_OBJECT
  48   public:
  49     explicit ObjectListModel(QObject *parent = 0);
  50     QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;
  51     int columnCount(const QModelIndex &parent = QModelIndex()) const;
  52     int rowCount(const QModelIndex &parent = QModelIndex()) const;
  53
  54     void objectAdded(QObject *obj);
  55     void objectRemoved(QObject *obj);
  56
  57   private slots:
  58     void objectAddedMainThread(QObject *obj);
  59     void objectRemovedMainThread(QObject *obj);
  60
  61   private:
  62     mutable QReadWriteLock m_lock;
  63     // vector for stable iterators/indexes, esp. for the model methods
  64     QVector<QObject*> m_objects;
  65 };
  66
  67 }
  68
  69 #endif // GAMMARAY_OBJECTLISTMODEL_H