src/kitemviews/private/kitemlistsizehintresolver.cpp

   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 #include "kitemlistsizehintresolver.h"
  21
  22 #include <kitemviews/kitemlistview.h>
  23 #include <KDebug>
  24
  25 KItemListSizeHintResolver::KItemListSizeHintResolver(const KItemListView* itemListView) :
  26     m_itemListView(itemListView),
  27     m_sizeHintCache()
  28 {
  29 }
  30
  31 KItemListSizeHintResolver::~KItemListSizeHintResolver()
  32 {
  33 }
  34
  35 QSizeF KItemListSizeHintResolver::sizeHint(int index) const
  36 {
  37     QSizeF size = m_sizeHintCache.at(index);
  38     if (size.isEmpty()) {
  39         size = m_itemListView->itemSizeHint(index);
  40         m_sizeHintCache[index] = size;
  41     }
  42     return size;
  43 }
  44
  45 void KItemListSizeHintResolver::itemsInserted(int index, int count)
  46 {
  47     const int currentCount = m_sizeHintCache.count();
  48     m_sizeHintCache.reserve(currentCount + count);
  49     while (count > 0) {
  50         m_sizeHintCache.insert(index, QSizeF());
  51         ++index;
  52         --count;
  53     }
  54 }
  55
  56 void KItemListSizeHintResolver::itemsRemoved(int index, int count)
  57 {
  58     const QList<QSizeF>::iterator begin = m_sizeHintCache.begin() + index;
  59     const QList<QSizeF>::iterator end = begin + count;
  60     m_sizeHintCache.erase(begin, end);
  61 }
  62
  63 void KItemListSizeHintResolver::itemsMoved(int index, int count)
  64 {
  65     while (count) {
  66         m_sizeHintCache[index] = QSizeF();
  67         ++index;
  68         --count;
  69     }
  70 }
  71
  72 void KItemListSizeHintResolver::itemsChanged(int index, int count, const QSet<QByteArray>& roles)
  73 {
  74     Q_UNUSED(roles);
  75     while (count) {
  76         m_sizeHintCache[index] = QSizeF();
  77         ++index;
  78         --count;
  79     }
  80 }
  81
  82 void KItemListSizeHintResolver::clearCache()
  83 {
  84     const int count = m_sizeHintCache.count();
  85     for (int i = 0; i < count; ++i) {
  86         m_sizeHintCache[i] = QSizeF();
  87     }
  88 }