src/kitemviews/private/kitemlistsizehintresolver.h

   1 /***************************************************************************
   2  *   Copyright (C) 2011 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program 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 General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #ifndef KITEMLISTSIZEHINTRESOLVER_H
  21 #define KITEMLISTSIZEHINTRESOLVER_H
  22
  23 #include "dolphin_export.h"
  24
  25 #include <kitemviews/kitemmodelbase.h>
  26 #include <QSizeF>
  27 #include <QVector>
  28
  29 class KItemListView;
  30
  31 /**
  32  * @brief Calculates and caches the sizehints of items in KItemListView.
  33  */
  34 class DOLPHIN_EXPORT KItemListSizeHintResolver
  35 {
  36 public:
  37     KItemListSizeHintResolver(const KItemListView* itemListView);
  38     virtual ~KItemListSizeHintResolver();
  39     QSizeF sizeHint(int index);
  40
  41     void itemsInserted(const KItemRangeList& itemRanges);
  42     void itemsRemoved(const KItemRangeList& itemRanges);
  43     void itemsMoved(const KItemRange& range, const QList<int>& movedToIndexes);
  44     void itemsChanged(int index, int count, const QSet<QByteArray>& roles);
  45
  46     void clearCache();
  47     void updateCache();
  48
  49 private:
  50     const KItemListView* m_itemListView;
  51     mutable QVector<qreal> m_logicalHeightHintCache;
  52     mutable qreal m_logicalWidthHint;
  53     bool m_needsResolving;
  54 };
  55
  56 #endif