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/***************************************************************************
* Copyright (C) 2011 by Peter Penz <[email protected]> *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
***************************************************************************/
#include "kitemlistsizehintresolver.h"
#include "kitemviews/kitemlistview.h"
KItemListSizeHintResolver::KItemListSizeHintResolver(const KItemListView* itemListView) :
m_itemListView(itemListView),
m_logicalHeightHintCache(),
m_logicalWidthHint(0.0),
m_minHeightHint(0.0),
m_needsResolving(false)
{
}
KItemListSizeHintResolver::~KItemListSizeHintResolver()
{
}
QSizeF KItemListSizeHintResolver::minSizeHint()
{
updateCache();
return QSizeF(m_logicalWidthHint, m_minHeightHint);
}
QSizeF KItemListSizeHintResolver::sizeHint(int index)
{
updateCache();
return QSizeF(m_logicalWidthHint, m_logicalHeightHintCache.at(index));
}
void KItemListSizeHintResolver::itemsInserted(const KItemRangeList& itemRanges)
{
int insertedCount = 0;
foreach (const KItemRange& range, itemRanges) {
insertedCount += range.count;
}
const int currentCount = m_logicalHeightHintCache.count();
m_logicalHeightHintCache.reserve(currentCount + insertedCount);
// We build the new list from the end to the beginning to mimize the
// number of moves.
m_logicalHeightHintCache.insert(m_logicalHeightHintCache.end(), insertedCount, 0.0);
int sourceIndex = currentCount - 1;
int targetIndex = m_logicalHeightHintCache.count() - 1;
int itemsToInsertBeforeCurrentRange = insertedCount;
for (int rangeIndex = itemRanges.count() - 1; rangeIndex >= 0; --rangeIndex) {
const KItemRange& range = itemRanges.at(rangeIndex);
itemsToInsertBeforeCurrentRange -= range.count;
// First: move all existing items that must be put behind 'range'.
while (targetIndex >= itemsToInsertBeforeCurrentRange + range.index + range.count) {
m_logicalHeightHintCache[targetIndex] = m_logicalHeightHintCache[sourceIndex];
--sourceIndex;
--targetIndex;
}
// Then: insert QSizeF() for the items which are inserted into 'range'.
while (targetIndex >= itemsToInsertBeforeCurrentRange + range.index) {
m_logicalHeightHintCache[targetIndex] = 0.0;
--targetIndex;
}
}
m_needsResolving = true;
Q_ASSERT(m_logicalHeightHintCache.count() == m_itemListView->model()->count());
}
void KItemListSizeHintResolver::itemsRemoved(const KItemRangeList& itemRanges)
{
const QVector<qreal>::iterator begin = m_logicalHeightHintCache.begin();
const QVector<qreal>::iterator end = m_logicalHeightHintCache.end();
KItemRangeList::const_iterator rangeIt = itemRanges.constBegin();
const KItemRangeList::const_iterator rangeEnd = itemRanges.constEnd();
QVector<qreal>::iterator destIt = begin + rangeIt->index;
QVector<qreal>::iterator srcIt = destIt + rangeIt->count;
++rangeIt;
while (srcIt != end) {
*destIt = *srcIt;
++destIt;
++srcIt;
if (rangeIt != rangeEnd && srcIt == begin + rangeIt->index) {
// Skip the items in the next removed range.
srcIt += rangeIt->count;
++rangeIt;
}
}
m_logicalHeightHintCache.erase(destIt, end);
// Note that the cache size might temporarily not match the model size if
// this function is called from KItemListView::setModel() to empty the cache.
if (!m_logicalHeightHintCache.isEmpty() && m_itemListView->model()) {
Q_ASSERT(m_logicalHeightHintCache.count() == m_itemListView->model()->count());
}
}
void KItemListSizeHintResolver::itemsMoved(const KItemRange& range, const QList<int>& movedToIndexes)
{
QVector<qreal> newLogicalHeightHintCache(m_logicalHeightHintCache);
const int movedRangeEnd = range.index + range.count;
for (int i = range.index; i < movedRangeEnd; ++i) {
const int newIndex = movedToIndexes.at(i - range.index);
newLogicalHeightHintCache[newIndex] = m_logicalHeightHintCache.at(i);
}
m_logicalHeightHintCache = newLogicalHeightHintCache;
}
void KItemListSizeHintResolver::itemsChanged(int index, int count, const QSet<QByteArray>& roles)
{
Q_UNUSED(roles)
while (count) {
m_logicalHeightHintCache[index] = 0.0;
++index;
--count;
}
m_needsResolving = true;
}
void KItemListSizeHintResolver::clearCache()
{
m_logicalHeightHintCache.fill(0.0);
m_needsResolving = true;
}
void KItemListSizeHintResolver::updateCache()
{
if (m_needsResolving) {
m_itemListView->calculateItemSizeHints(m_logicalHeightHintCache, m_logicalWidthHint);
m_needsResolving = false;
}
}
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