void BigListModel::fetchMore(const QModelIndex &parent)
{
beginInsertRows(QModelIndex(), mCount, mCount + 100 -1);
cacheRow(mCount, mCount+100);
mCount += 100;
endInsertRows();
}
bool BigListModel::load()
{
if(mFile.open(QIODevice::ReadOnly|QIODevice::Text))
{
mStream.setDevice(&mFile);
mCount = 100;
mLines = mFile.size() / 9;
mCache.setCapacity(200);
cacheRow(0,100);
}
return true;
}
/**
* This sets the current row of interest. This row is then loaded as well
* as windowSize rows above and below. Any non-overlapping rows with the
* last row of interest are removed from memory.
*
* @param r The new row of interest.
*/
void ChunkRowCache::row(int32 r)
{
// Remove any cached chunks no longer needed:
if (row_ != OUTOFSPACE)
{
for (int32 i = row_ - (int32)windowSize_; i <= row_ + (int32)windowSize_; ++i)
{
if (r == OUTOFSPACE || !(r - (int32)windowSize_ <= i && i <= r + (int32)windowSize_))
decacheRow(i);
}
}
row_ = r;
// Cache new chunks that are needed:
if (row_ != OUTOFSPACE)
{
for (int32 i = row_ - (int32)windowSize_; i <= row_ + (int32)windowSize_; ++i)
{
cacheRow(i);
}
}
}